Feb 8, 2018

Standards – NFPA

NFPA 1	Fire Code
NFPA 2	Hydrogen Technologies Code
NFPA 3	Recommended Practice for Commissioning of Fire Protection and Life Safety Systems
NFPA 4	Standard for Integrated Fire Protection and Life Safety System Testing
NFPA 10	Standard for Portable Fire Extinguishers
NFPA 11	Standard for Low-, Medium-, and High-Expansion Foam
NFPA 11A	Standard for Medium- and High-Expansion Foam Systems
NFPA 11C	Standard for Mobile Foam Apparatus
NFPA 12	Standard on Carbon Dioxide Extinguishing Systems
NFPA 12A	Standard on Halon 1301 Fire Extinguishing Systems
NFPA 13	Standard for the Installation of Sprinkler Systems
NFPA 13D	Standard for the Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes
NFPA 13E	Recommended Practice for Fire Department Operations in Properties Protected by Sprinkler and Standpipe Systems
NFPA 13R	Standard for the Installation of Sprinkler Systems in Low-Rise Residential Occupancies
NFPA 14	Standard for the Installation of Standpipe and Hose Systems
NFPA 15	Standard for Water Spray Fixed Systems for Fire Protection
NFPA 16	Standard for the Installation of Foam-Water Sprinkler and Foam-Water Spray Systems
NFPA 17	Standard for Dry Chemical Extinguishing Systems
NFPA 17A	Standard for Wet Chemical Extinguishing Systems
NFPA 18	Standard on Wetting Agents
NFPA 18A	Standard on Water Additives for Fire Control and Vapor Mitigation
NFPA 20	Standard for the Installation of Stationary Pumps for Fire Protection
NFPA 22	Standard for Water Tanks for Private Fire Protection
NFPA 24	Standard for the Installation of Private Fire Service Mains and Their Appurtenances
NFPA 25	Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems
NFPA 30	Flammable and Combustible Liquids Code
NFPA 30A	Code for Motor Fuel Dispensing Facilities and Repair Garages
NFPA 30B	Code for the Manufacture and Storage of Aerosol Products
NFPA 31	Standard for the Installation of Oil-Burning Equipment
NFPA 32	Standard for Drycleaning Facilities
NFPA 33	Standard for Spray Application Using Flammable or Combustible Materials
NFPA 34	Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids
NFPA 35	Standard for the Manufacture of Organic Coatings
NFPA 36	Standard for Solvent Extraction Plants
NFPA 37	Standard for the Installation and Use of Stationary Combustion Engines and Gas Turbines
NFPA 40	Standard for the Storage and Handling of Cellulose Nitrate Film
NFPA 42	Code for the Storage of Pyroxylin Plastic
NFPA 45	Standard on Fire Protection for Laboratories Using Chemicals
NFPA 46	Recommended Safe Practice for Storage of Forest Products
NFPA 50	Standard for Bulk Oxygen Systems at Consumer Sites
NFPA 50A	Standard for Gaseous Hydrogen Systems at Consumer Sites
NFPA 50B	Standard for Liquefied Hydrogen Systems at Consumer Sites
NFPA 51	Standard for the Design and Installation of Oxygen-Fuel Gas Systems for Welding, Cutting, and Allied Processes
NFPA 51A	Standard for Acetylene Cylinder Charging Plants
NFPA 51B	Standard for Fire Prevention During Welding, Cutting, and Other Hot Work
NFPA 52	Vehicular Natural Gas Fuel Systems Code
NFPA 53	Recommended Practice on Materials, Equipment, and Systems Used in Oxygen-Enriched Atmospheres
NFPA 54	National Fuel Gas Code
NFPA 55	Compressed Gases and Cryogenic Fluids Code
NFPA 56	Standard for Fire and Explosion Prevention During Cleaning and Purging of Flammable Gas Piping Systems
NFPA 57	Liquefied Natural Gas (LNG) Vehicular Fuel Systems Code
NFPA 58	Liquefied Petroleum Gas Code
NFPA 59	Utility LP-Gas Plant Code
NFPA 59A	Standard for the Production, Storage, and Handling of Liquefied Natural Gas (LNG)
NFPA 61	Standard for the Prevention of Fires and Dust Explosions in Agricultural and Food Processing Facilities
NFPA 67	Guide on Explosion Protection for Gaseous Mixtures in Pipe Systems
NFPA 68	Standard on Explosion Protection by Deflagration Venting
NFPA 69	Standard on Explosion Prevention Systems
NFPA 70	National Electrical Code
NFPA 70A	National Electrical Code Requirements for One- and Two-Family Dwellings
NFPA 70B	Recommended Practice for Electrical Equipment Maintenance
NFPA 70E	Standard for Electrical Safety in the Workplace
NFPA 72	National Fire Alarm and Signaling Code
NFPA 73	Standard for Electrical Inspections for Existing Dwellings
NFPA 75	Standard for the Fire Protection of Information Technology Equipment
NFPA 76	Standard for the Fire Protection of Telecommunications Facilities
NFPA 77	Recommended Practice on Static Electricity
NFPA 79	Electrical Standard for Industrial Machinery
NFPA 80	Standard for Fire Doors and Other Opening Protectives
NFPA 80A	Recommended Practice for Protection of Buildings from Exterior Fire Exposures
NFPA 82	Standard on Incinerators and Waste and Linen Handling Systems and Equipment
NFPA 85	Boiler and Combustion Systems Hazards Code
NFPA 86	Standard for Ovens and Furnaces
NFPA 86C	Standard for Industrial Furnaces Using a Special Processing Atmosphere
NFPA 86D	Standard for Industrial Furnaces Using Vacuum as an Atmosphere
NFPA 87	Recommended Practice for Fluid Heaters
NFPA 88A	Standard for Parking Structures
NFPA 88B	Standard for Repair Garages
NFPA 90A	Standard for the Installation of Air-Conditioning and Ventilating Systems
NFPA 90B	Standard for the Installation of Warm Air Heating and Air-Conditioning Systems
NFPA 91	Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists, and Particulate Solids
NFPA 92	Standard for Smoke Control Systems
NFPA 92A	Standard for Smoke-Control Systems Utilizing Barriers and Pressure Differences
NFPA 92B	Standard for Smoke Management Systems in Malls, Atria, and Large Spaces
NFPA 96	Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations
NFPA 97	Standard Glossary of Terms Relating to Chimneys, Vents, and Heat-Producing Appliances
NFPA 99	Health Care Facilities Code
NFPA 99B	Standard for Hypobaric Facilities
NFPA 101	Life Safety Code
NFPA 101A	Guide on Alternative Approaches to Life Safety
NFPA 101B	Code for Means of Egress for Buildings and Structures
NFPA 102	Standard for Grandstands, Folding and Telescopic Seating, Tents, and Membrane Structures
NFPA 105	Standard for Smoke Door Assemblies and Other Opening Protectives
NFPA 110	Standard for Emergency and Standby Power Systems
NFPA 111	Standard on Stored Electrical Energy Emergency and Standby Power Systems
NFPA 115	Standard for Laser Fire Protection
NFPA 120	Standard for Fire Prevention and Control in Coal Mines
NFPA 121	Standard on Fire Protection for Self-Propelled and Mobile Surface Mining Equipment
NFPA 122	Standard for Fire Prevention and Control in Metal/Nonmetal Mining and Metal Mineral Processing Facilities
NFPA 123	Standard for Fire Prevention and Control in Underground Bituminous Coal Mines
NFPA 130	Standard for Fixed Guideway Transit and Passenger Rail Systems
NFPA 140	Standard on Motion Picture and Television Production Studio Soundstages, Approved Production Facilities, and Production Locations
NFPA 150	Standard on Fire and Life Safety in Animal Housing Facilities
NFPA 160	Standard for the Use of Flame Effects Before an Audience
NFPA 170	Standard for Fire Safety and Emergency Symbols
NFPA 203	Guide on Roof Coverings and Roof Deck Constructions
NFPA 204	Standard for Smoke and Heat Venting
NFPA 211	Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances
NFPA 214	Standard on Water-Cooling Towers
NFPA 220	Standard on Types of Building Construction
NFPA 221	Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls
NFPA 225	Model Manufactured Home Installation Standard
NFPA 230	Standard for the Fire Protection of Storage
NFPA 231	Standard for General Storage
NFPA 231C	Standard for Rack Storage of Materials
NFPA 231D	Standard for Storage of Rubber Tires
NFPA 231E	Recommended Practice for the Storage of Baled Cotton
NFPA 231F	Standard for the Storage of Roll Paper
NFPA 232	Standard for the Protection of Records
NFPA 232A	Guide for Fire Protection for Archives and Records Centers
NFPA 241	Standard for Safeguarding Construction, Alteration, and Demolition Operations
NFPA 251	Standard Methods of Tests of Fire Resistance of Building Construction and Materials
NFPA 252	Standard Methods of Fire Tests of Door Assemblies
NFPA 253	Standard Method of Test for Critical Radiant Flux of Floor Covering Systems Using a Radiant Heat Energy Source
NFPA 255	Standard Method of Test of Surface Burning Characteristics of Building Materials
NFPA 256	Standard Methods of Fire Tests of Roof Coverings
NFPA 257	Standard on Fire Test for Window and Glass Block Assemblies
NFPA 258	Recommended Practice for Determining Smoke Generation of Solid Materials
NFPA 259	Standard Test Method for Potential Heat of Building Materials
NFPA 260	Standard Methods of Tests and Classification System for Cigarette Ignition Resistance of Components of Upholstered Furniture
NFPA 261	Standard Method of Test for Determining Resistance of Mock-Up Upholstered Furniture Material Assemblies to Ignition by Smoldering Cigarettes
NFPA 262	Standard Method of Test for Flame Travel and Smoke of Wires and Cables for Use in Air-Handling Spaces
NFPA 265	Standard Methods of Fire Tests for Evaluating Room Fire Growth Contribution of Textile or Expanded Vinyl Wall Coverings on Full Height Panels and Walls
NFPA 266	Standard Method of Test for Fire Characteristics of Upholstered Furniture Exposed to Flaming Ignition Source
NFPA 267	Standard Method of Test for Fire Characteristics of Mattresses and Bedding Assemblies Exposed to Flaming Ignition Source
NFPA 268	Standard Test Method for Determining Ignitability of Exterior Wall Assemblies Using a Radiant Heat Energy Source
NFPA 269	Standard Test Method for Developing Toxic Potency Data for Use in Fire Hazard Modeling
NFPA 270	Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber
NFPA 271	Standard Method of Test for Heat and Visible Smoke Release Rates for Materials and Products Using an Oxygen Consumption Calorimeter
NFPA 272	Standard Method of Test for Heat and Visible Smoke Release Rates for Upholstered Furniture Components or Composites and Mattresses Using an Oxygen Consumption Calorimeter
NFPA 274	Standard Test Method to Evaluate Fire Performance Characteristics of Pipe Insulation
NFPA 275	Standard Method of Fire Tests for the Evaluation of Thermal Barriers
NFPA 276	Standard Method of Fire Test for Determining the Heat Release Rate of Roofing Assemblies with Combustible Above-Deck Roofing Components
NFPA 277	Standard Methods of Tests for Evaluating Fire and Ignition Resistance of Upholstered Furniture Using a Flaming Ignition Source
NFPA 285	Standard Fire Test Method for Evaluation of Fire Propagation Characteristics of Exterior Non-Load-Bearing Wall Assemblies Containing Combustible Components
NFPA 286	Standard Methods of Fire Tests for Evaluating Contribution of Wall and Ceiling Interior Finish to Room Fire Growth
NFPA 287	Standard Test Methods for Measurement of Flammability of Materials in Cleanrooms Using a Fire Propagation Apparatus (FPA)
NFPA 288	Standard Methods of Fire Tests of Horizontal Fire Door Assemblies Installed in Horizontal Fire Resistance-Rated Assemblies
NFPA 289	Standard Method of Fire Test for Individual Fuel Packages
NFPA 290	Standard for Fire Testing of Passive Protection Materials for Use on LP-Gas Containers
NFPA 291	Recommended Practice for Fire Flow Testing and Marking of Hydrants
NFPA 295	Standard for Wildfire Control
NFPA 297	Guide on Principles and Practices for Communications Systems
NFPA 298	Standard on Foam Chemicals for Wildland Fire Control
NFPA 299	Standard for Protection of Life and Property from Wildfire
NFPA 301	Code for Safety to Life from Fire on Merchant Vessels
NFPA 302	Fire Protection Standard for Pleasure and Commercial Motor Craft
NFPA 303	Fire Protection Standard for Marinas and Boatyards
NFPA 306	Standard for the Control of Gas Hazards on Vessels
NFPA 307	Standard for the Construction and Fire Protection of Marine Terminals, Piers, and Wharves
NFPA 312	Standard for Fire Protection of Vessels During Construction, Conversion, Repair, and Lay-Up
NFPA 318	Standard for the Protection of Semiconductor Fabrication Facilities
NFPA 326	Standard for the Safeguarding of Tanks and Containers for Entry, Cleaning, or Repair
NFPA 328	Recommended Practice for the Control of Flammable and Combustible Liquids and Gases in Manholes, Sewers, and Similar Underground Structures
NFPA 329	Recommended Practice for Handling Releases of Flammable and Combustible Liquids and Gases
NFPA 350	Guide for Safe Confined Space Entry and Work
NFPA 385	Standard for Tank Vehicles for Flammable and Combustible Liquids
NFPA 386	Standard for Portable Shipping Tanks for Flammable and Combustible Liquids
NFPA 395	Standard for the Storage of Flammable and Combustible Liquids at Farms and Isolated Sites
NFPA 400	Hazardous Materials Code
NFPA 402	Guide for Aircraft Rescue and Fire-Fighting Operations
NFPA 403	Standard for Aircraft Rescue and Fire-Fighting Services at Airports
NFPA 405	Standard for the Recurring Proficiency of Airport Fire Fighters
NFPA 407	Standard for Aircraft Fuel Servicing
NFPA 408	Standard for Aircraft Hand Portable Fire Extinguishers
NFPA 409	Standard on Aircraft Hangars
NFPA 410	Standard on Aircraft Maintenance
NFPA 412	Standard for Evaluating Aircraft Rescue and Fire-Fighting Foam Equipment
NFPA 414	Standard for Aircraft Rescue and Fire-Fighting Vehicles
NFPA 415	Standard on Airport Terminal Buildings, Fueling Ramp Drainage, and Loading Walkways
NFPA 418	Standard for Heliports
NFPA 422	Guide for Aircraft Accident/Incident Response Assessment
NFPA 423	Standard for Construction and Protection of Aircraft Engine Test Facilities
NFPA 424	Guide for Airport/Community Emergency Planning
NFPA 430	Code for the Storage of Liquid and Solid Oxidizers
NFPA 432	Code for the Storage of Organic Peroxide Formulations
NFPA 434	Code for the Storage of Pesticides
NFPA 450	Guide for Emergency Medical Services and Systems
NFPA 451	Guide for Fire Based Community Healthcare Providers
NFPA 471	Recommended Practice for Responding to Hazardous Materials Incidents
NFPA 472	Standard for Competence of Responders to Hazardous Materials/Weapons of Mass Destruction Incidents
NFPA 473	Standard for Competencies for EMS Personnel Responding to Hazardous Materials/Weapons of Mass Destruction Incidents
NFPA 475	Recommended Practice for Responding to Hazardous Materials Incidents/Weapons of Mass Destruction
NFPA 480	Standard for the Storage, Handling, and Processing of Magnesium Solids and Powders
NFPA 481	Standard for the Production, Processing, Handling, and Storage of Titanium
NFPA 482	Standard for the Production, Processing, Handling, and Storage of Zirconium
NFPA 484	Standard for Combustible Metals
NFPA 485	Standard for the Storage, Handling, Processing, and Use of Lithium Metal
NFPA 490	Code for the Storage of Ammonium Nitrate
NFPA 495	Explosive Materials Code
NFPA 496	Standard for Purged and Pressurized Enclosures for Electrical Equipment
NFPA 497	Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas
NFPA 498	Standard for Safe Havens and Interchange Lots for Vehicles Transporting Explosives
NFPA 499	Recommended Practice for the Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas
NFPA 501	Standard on Manufactured Housing
NFPA 501A	Standard for Fire Safety Criteria for Manufactured Home Installations, Sites, and Communities
NFPA 502	Standard for Road Tunnels, Bridges, and Other Limited Access Highways
NFPA 505	Fire Safety Standard for Powered Industrial Trucks Including Type Designations, Areas of Use, Conversions, Maintenance, and Operations
NFPA 513	Standard for Motor Freight Terminals
NFPA 520	Standard on Subterranean Spaces
NFPA 550	Guide to the Fire Safety Concepts Tree
NFPA 551	Guide for the Evaluation of Fire Risk Assessments
NFPA 555	Guide on Methods for Evaluating Potential for Room Flashover
NFPA 556	Guide on Methods for Evaluating Fire Hazard to Occupants of Passenger Road Vehicles
NFPA 557	Standard for Determination of Fire Loads for Use in Structural Fire Protection Design
NFPA 560	Standard for the Storage, Handling, and Use of Ethylene Oxide for Sterilization and Fumigation
NFPA 600	Standard on Facility Fire Brigades
NFPA 601	Standard for Security Services in Fire Loss Prevention
NFPA 610	Guide for Emergency and Safety Operations at Motorsports Venues
NFPA 650	Standard for Pneumatic Conveying Systems for Handling Combustible Particulate Solids
NFPA 651	Standard for the Machining and Finishing of Aluminum and the Production and Handling of Aluminum Powders
NFPA 652	Standard on the Fundamentals of Combustible Dust
NFPA 654	Standard for the Prevention of Fire and Dust Explosions from the Manufacturing, Processing, and Handling of Combustible Particulate Solids
NFPA 655	Standard for Prevention of Sulfur Fires and Explosions
NFPA 664	Standard for the Prevention of Fires and Explosions in Wood Processing and Woodworking Facilities
NFPA 701	Standard Methods of Fire Tests for Flame Propagation of Textiles and Films
NFPA 703	Standard for Fire RetardantTreated Wood and FireRetardant Coatings for Building Materials
NFPA 704	Standard System for the Identification of the Hazards of Materials for Emergency Response
NFPA 705	Recommended Practice for a Field Flame Test for Textiles and Films
NFPA 720	Standard for the Installation of Carbon Monoxide(CO) Detection and Warning Equipment
NFPA 730	Guide for Premises Security
NFPA 731	Standard for the Installation of Electronic Premises Security Systems
NFPA 750	Standard on Water Mist Fire Protection Systems
NFPA 770	Standard on Hybrid (Water and Inert Gas) Fire Extinguishing Systems
NFPA 780	Standard for the Installation of Lightning Protection Systems
NFPA 790	Standard for Competency of Third-Party Field Evaluation Bodies
NFPA 791	Recommended Practice and Procedures for Unlabeled Electrical Equipment Evaluation
NFPA 801	Standard for Fire Protection for Facilities Handling Radioactive Materials
NFPA 803	Standard for Fire Protection for Light Water Nuclear Power Plants
NFPA 804	Standard for Fire Protection for Advanced Light Water Reactor Electric Generating Plants
NFPA 805	Performance-Based Standard for Fire Protection for Light Water Reactor Electric Generating Plants
NFPA 806	Performance-Based Standard for Fire Protection for Advanced Nuclear Reactor Electric Generating Plants Change Process
NFPA 820	Standard for Fire Protection in Wastewater Treatment and Collection Facilities
NFPA 850	Recommended Practice for Fire Protection for Electric Generating Plants and High Voltage Direct Current Converter Stations
NFPA 851	Recommended Practice for Fire Protection for Hydroelectric Generating Plants
NFPA 853	Standard for the Installation of Stationary Fuel Cell Power Systems
NFPA 900	Building Energy Code
NFPA 901	Standard Classifications for Incident Reporting and Fire Protection Data
NFPA 902	Fire Reporting Field Incident Guide
NFPA 903	Fire Reporting Property Survey Guide
NFPA 904	Incident Follow-up Report Guide
NFPA 906	Guide for Fire Incident Field Notes
NFPA 909	Code for the Protection of Cultural Resource Properties – Museums, Libraries, and Places of Worship
NFPA 914	Code for Fire Protection of Historic Structures
NFPA 921	Guide for Fire and Explosion Investigations
NFPA 950	Standard for Data Development and Exchange for the Fire Service
NFPA 951	Guide to Building and Utilizing Digital Information
NFPA 1000	Standard for Fire Service Professional Qualifications Accreditation and Certification Systems
NFPA 1001	Standard for Fire Fighter Professional Qualifications
NFPA 1002	Standard for Fire Apparatus Driver/Operator Professional Qualifications
NFPA 1003	Standard for Airport Fire Fighter Professional Qualifications
NFPA 1005	Standard for Professional Qualifications for Marine Fire Fighting for Land-Based Fire Fighters
NFPA 1006	Standard for Technical Rescuer Professional Qualifications
NFPA 1021	Standard for Fire Officer Professional Qualifications
NFPA 1026	Standard for Incident Management Personnel Professional Qualifications
NFPA 1031	Standard for Professional Qualifications for Fire Inspector and Plan Examiner
NFPA 1033	Standard for Professional Qualifications for Fire Investigator
NFPA 1035	Standard on Fire and Life Safety Educator, Public Information Officer, Youth Firesetter Intervention Specialist and Youth Firesetter Program Manager Professional Qualifications
NFPA 1037	Standard on Fire Marshal Professional Qualifications
NFPA 1041	Standard for Fire Service Instructor Professional Qualifications
NFPA 1051	Standard for Wildland Firefighting Personnel Professional Qualifications
NFPA 1061	Professional Qualifications for Public Safety Telecommunications Personnel
NFPA 1071	Standard for Emergency Vehicle Technician Professional Qualifications
NFPA 1072	Standard for Hazardous Materials/Weapons of Mass Destruction Emergency Response Personnel Professional Qualifications
NFPA 1081	Standard for Industrial Fire Brigade Member Professional Qualifications
NFPA 1082	Standard for Building Fire and Life Safety Director Professional Qualifications
NFPA 1091	Standard for Traffic Control Incident Management Professional Qualifications
NFPA 1122	Code for Model Rocketry
NFPA 1123	Code for Fireworks Display
NFPA 1124	Code for the Manufacture, Transportation, and Storage of Fireworks and Pyrotechnic Articles
NFPA 1125	Code for the Manufacture of Model Rocket and High-Power Rocket Motors
NFPA 1126	Standard for the Use of Pyrotechnics Before a Proximate Audience
NFPA 1127	Code for High Power Rocketry
PYR 1128	Standard Method of Fire Test for Flame Breaks
PYR 1129	Standard Method of Fire Test for Covered Fuse on Consumer Fireworks
NFPA 1141	Standard for Fire Protection Infrastructure for Land Development in Wildland, Rural, and Suburban Areas
NFPA 1142	Standard on Water Supplies for Suburban and Rural Fire Fighting
NFPA 1143	Standard for Wildland Fire Management
NFPA 1144	Standard for Reducing Structure Ignition Hazards from Wildland Fire
NFPA 1145	Guide for the Use of Class A Foams in Fire Fighting
NFPA 1150	Standard on Foam Chemicals for Fires in Class A Fuels
NFPA 1192	Standard on Recreational Vehicles
NFPA 1194	Standard for Recreational Vehicle Parks and Campgrounds
NFPA 1201	Standard for Providing Fire and Emergency Services to the Public
NFPA 1221	Standard for the Installation, Maintenance, and Use of Emergency Services Communications Systems
NFPA 1231	Standard on Water Supplies for Suburban and Rural Fire Fighting
NFPA 1250	Recommended Practice in Fire and Emergency Service Organization Risk Management
NFPA 1300	Standard on Community Risk Assessment and Community Risk Reduction Plan Development
NFPA 1401	Recommended Practice for Fire Service Training Reports and Records
NFPA 1402	Guide to Building Fire Service Training Centers
NFPA 1403	Standard on Live Fire Training Evolutions
NFPA 1404	Standard for Fire Service Respiratory Protection Training
NFPA 1405	Guide for Land-Based Fire Departments that Respond to Marine Vessel Fires
NFPA 1407	Standard for Training Fire Service Rapid Intervention Crews
NFPA 1408	Standard for Training Fire Service Personnel in the Operation, Care, Use, and Maintenance of Thermal Imagers
NFPA 1410	Standard on Training for Emergency Scene Operations
NFPA 1451	Standard for a Fire and Emergency Service Vehicle Operations Training Program
NFPA 1452	Guide for Training Fire Service Personnel to Conduct Community Risk Reduction
NFPA 1500	Standard on Fire Department Occupational Safety and Health Program
NFPA 1521	Standard for Fire Department Safety Officer Professional Qualifications
NFPA 1561	Standard on Emergency Services Incident Management System and Command Safety
NFPA 1581	Standard on Fire Department Infection Control Program
NFPA 1582	Standard on Comprehensive Occupational Medical Program for Fire Departments
NFPA 1583	Standard on Health-Related Fitness Programs for Fire Department Members
NFPA 1584	Standard on the Rehabilitation Process for Members During Emergency Operations and Training Exercises
NFPA 1600	Standard on Disaster/Emergency Management and Business Continuity/Continuity of Operations Programs
NFPA 1616	Standard for Mass Evacuation and Sheltering
NFPA 1620	Standard for Pre-Incident Planning
NFPA 1670	Standard on Operations and Training for Technical Search and Rescue Incidents
NFPA 1700	Guide for Structural Fire Fighting
NFPA 1710	Standard for the Organization and Deployment of Fire Suppression Operations, Emergency Medical Operations, and Special Operations to the Public by Career Fire Departments
NFPA 1720	Standard for the Organization and Deployment of Fire Suppression Operations, Emergency Medical Operations and Special Operations to the Public by Volunteer Fire Departments
NFPA 1730	Standard on Organization and Deployment of Fire Prevention Inspection and Code Enforcement, Plan Review, Investigation, and Public Education Operations
NFPA 1801	Standard on Thermal Imagers for the Fire Service
NFPA 1802	Standard on Personal Portable (Hand-Held) Two-Way Radio Communications Devices for Use by Emergency Services Personnel in the Hazard Zone
NFPA 1851	Standard on Selection, Care, and Maintenance of Protective Ensembles for Structural Fire Fighting and Proximity Fire Fighting
NFPA 1852	Standard on Selection, Care, and Maintenance of Open-Circuit Self-Contained Breathing Apparatus (SCBA)
NFPA 1855	Standard for Selection, Care, and Maintenance of Protective Ensembles for Technical Rescue Incidents
NFPA 1858	Standard on Selection, Care, and Maintenance of Life Safety Rope and Equipment for Emergency Services
NFPA 1877	Standard on Selection, Care, and Maintenance of Wildland Fire Fighting Clothing and Equipment
NFPA 1901	Standard for Automotive Fire Apparatus
NFPA 1906	Standard for Wildland Fire Apparatus
NFPA 1911	Standard for the Inspection, Maintenance, Testing, and Retirement of In-Service Automotive Fire Apparatus
NFPA 1912	Standard for Fire Apparatus Refurbishing
NFPA 1914	Standard for Testing Fire Department Aerial Devices
NFPA 1915	Standard for Fire Apparatus Preventive Maintenance Program
NFPA 1917	Standard for Automotive Ambulances
NFPA 1925	Standard on Marine Fire-Fighting Vessels
NFPA 1931	Standard for Manufacturer’s Design of Fire Department Ground Ladders
NFPA 1932	Standard on Use, Maintenance, and Service Testing of In-Service Fire Department Ground Ladders
NFPA 1936	Standard on Powered Rescue Tools
NFPA 1937	Standard for the Selection, Care, and Maintenance of Rescue Tools
NFPA 1951	Standard on Protective Ensembles for Technical Rescue Incidents
NFPA 1952	Standard on Surface Water Operations Protective Clothing and Equipment
NFPA 1953	Standard on Protective Ensembles for Contaminated Water Diving
NFPA 1961	Standard on Fire Hose
NFPA 1962	Standard for the Care, Use, Inspection, Service Testing, and Replacement of Fire Hose, Couplings, Nozzles, and Fire Hose Appliances
NFPA 1963	Standard for Fire Hose Connections
NFPA 1964	Standard for Spray Nozzles
NFPA 1965	Standard for Fire Hose Appliances
NFPA 1971	Standard on Protective Ensembles for Structural Fire Fighting and Proximity Fire Fighting
NFPA 1975	Standard on Station/Work Uniforms for Emergency Services
NFPA 1976	Standard on Protective Ensemble for Proximity Fire Fighting
NFPA 1977	Standard on Protective Clothing and Equipment for Wildland Fire Fighting
NFPA 1981	Standard on Open-Circuit Self-Contained Breathing Apparatus (SCBA) for Emergency Services
NFPA 1982	Standard on Personal Alert Safety Systems (PASS)
NFPA 1983	Standard on Life Safety Rope and Equipment for Emergency Services
NFPA 1984	Standard on Respirators for Wildland Fire Fighting Operations
NFPA 1986	Standard on Respiratory Protection Equipment for Technical and Tactical Operations
NFPA 1987	Standard on Combination Unit Respirator Systems for Tactical and Technical Operations
NFPA 1989	Standard on Breathing Air Quality for Emergency Services Respiratory Protection
NFPA 1991	Standard on Vapor-Protective Ensembles for Hazardous Materials Emergencies
NFPA 1992	Standard on Liquid Splash-Protective Ensembles and Clothing for Hazardous Materials Emergencies
NFPA 1994	Standard on Protective Ensembles for First Responders to CBRN Terrorism Incidents
NFPA 1999	Standard on Protective Clothing and Ensembles for Emergency Medical Operations
NFPA 2001	Standard on Clean Agent Fire Extinguishing Systems
NFPA 2010	Standard for Fixed Aerosol Fire-Extinguishing Systems
NFPA 2112	Standard on Flame-Resistant Garments for Protection of Industrial Personnel Against Flash Fire
NFPA 2113	Standard on Selection, Care, Use, and Maintenance of Flame-Resistant Garments for Protection of Industrial Personnel Against Short-Duration Thermal Exposures
NFPA 5000	Building Construction and Safety Code
NFPA 8501	Standard for Single Burner Boiler Operation
NFPA 8502	Standard for the Prevention of Furnace Explosions/Implosions in Multiple Burner Boilers
NFPA 8503	Standard for Pulverized Fuel Systems
NFPA 8504	Standard on Atmospheric Fluidized-Bed Boiler Operation
NFPA 8505	Standard for Stoker Operation
NFPA 8506	Standard on Heat Recovery Steam Generator Systems

by PipeAdmin
Tags: acronyms, electrical, Electrician

Feb 8, 2018

Standards – ASME

A105/105M	“Standard Specification for Carbon Steel Forgings for piping applications”
A181/181M	“Standard Specification for Carbon Steel Forgings for General purpose piping”
A182/182M	“Standard Specification for forged or rolled alloy-steel pipe flanges, forged fittings and valves and parts for high-temperature service”
A230	“Standard specification for steel wire oil – tempered carbon valve spring quality”
A232	“Standard specification for chromium – vanadium alloy steel valve spring quality”
A338	Standard specification for ultrasonic examination of heavy steel forgings
A350	“Standard specification for forged or rolled carbon and alloy steel flanges forged fittings and valves and parts for low – temperature service”
A404	“Standards specification for forged or rolled alloy – steel pipe flanges forged fittings and valves and parts specially heat treated for high temperature service”
A522	Forged or rolled 8% and 9% nickel alloy steel flanges fittings valves and parts for low – temperature service
A694	“Standard specification for forgings carbon and alloy steel for pipe flanges fittings valves and parts for high – pressure transmission service”
A727/727M	“Standard specification for carbon steel forgings for piping components with inherent notch toughness”
A961	“Standard Specification for Common Requirements for Steel Flanges, Forged Fittings, valves, and Parts for Piping Applications”
B16.1 – 1998	“Cast Iron Pipe Flanges and Flanged FittingsThis Standard for Classes 25, 125, 250 Cast Iron Pipe Flanges and Flanged Fittings covers:\n\n(a) pressure-temperature ratings,\n(b) sizes and method of designating openings of reducing fittings,\n(c) marking,\n(d) minimum requirements for materials,\n(e) dimensions and tolerances,\n(f) bolt, nut, and gasket dimensions and\n(g) tests.”
B16.10	“Face to Face and End-to-End Dimensions of Valves”
B16.10 – 2000	“Face-to-Face and End-to-End Dimensions of Valves This Standard covers face-to-face and end-to-end dimensions of straightway valves, and center-to face and center-to-end dimensions of angle valves. Its purpose is to assure installation interchangeability for valves of a given material, type size, rating class, and end connection”
B16.11 – 2001	“Forged Steel Fittings, Socket-Welding and ThreadedThis Standard covers ratings, dimensions, tolerances, marking and material requirements for forged fittings, both socket-welding and threaded.”
B16.12 – 1998	“Cast Iron Threaded Drainage Fittings This Standard for cast iron threaded drainage fittings covers:\n\n(a) size and method of designating openings in reducing fittings\n(b) marking\n(c) materials\n(d) dimensions and tolerances\n(e) threading\n(f) ribs\n(g) coatings\n(h) face bevel discharge nozzles, input shafts, base plates, and foundation bolt holes (see Tables 1 and 2).”
B16.14 – 1991	“Ferrous Pipe Plugs, Bushings and Lock-nuts with Pipe Threads This Standard for Ferrous Pipe Plugs, Bushings, and Lock-nuts with Pipe Threads covers:\n\n(a) pressure-temperature ratings:\n(b) size;\n(c) marking;\n(d) materials;\n(e) dimensions and tolerances;\n(f) threading; and\n(g) pattern taper.”
B16.15 – 1985 (R1994)	“Cast Bronze Threaded Fittings This Standard pertains primarily to cast Class 125and Class 250 bronze threaded pipe fittings. Certain requirements also pertain to wrought or cast plugs, bushings, couplings, and caps. This Standard covers:\n\n(a) pressure-temperature ratings;\n(b) size and method of designating openings of reducing pipe fittings;\n(c) marking;\n(d) minimum requirements for casting quality and materials;\n(e) dimensions and tolerances in U.S. customary and metric (SI) units;\n(f) threading.”
B16.18 – 1984 (R1994)	“Cast Copper Alloy Solder Joint Pressure Fittings This Standard for cast copper alloy solder joint pressure fittings designed for use with copper water tube, establishes requirements for:\n\n(a) Pressure-temperature ratings;\n(b) Abbreviations for end connections;\n(c) Sizes and method of designating openings of fittings;\n(d) Marking;\n(e) Material;\n(f) Dimensions and tolerances; and\n(g) Tests.”
B16.20 – 1998	“Metallic Gaskets for Pipe Flanges-Ring-Joint, Spiral-Would, and Jacketed This standard covers materials, dimensions, tolerances, and markings for metal ring-joint gaskets, spiral-wound metal gaskets, and metal jacketed gaskets and filler material. These gaskets are dimensionally suitable for used with flanges described in the reference flange standards ASME/ANSI B16.5, ASME B16.47, and API-6A. This standard covers spiral-wound metal gaskets and metal jacketed gaskets for use with raised face and flat face flanges. Replaces API-601 or API-601.”
B16.21 – 1992	“Nonmetallic Flat Gaskets for Pipe FlangesThis Standard for nonmetallic flat gaskets for bolted flanged joints in piping includes:\n\n(a) types and sizes;\n(b) materials;\n(c) dimensions and allowable tolerances.”
B16.22 – 1995	“Wrought Copper and Copper Alloy Solder Joint Pressure FittingsThe Standard establishes specifications for wrought copper and wrought copper alloy, solder-joint, seamless fittings, designed for use with seamless copper tube conforming to ASTM B 88 (water and general plumbing systems), B 280 (air conditioning and refrigeration service), and B 819 (medical gas systems), as well as fittings intended to be assembled with soldering materials conforming to ASTM B 32, brazing materials conforming to AWS A5.8, or with tapered pipe thread conforming to ASME B1.20.1. This Standard is allied with ASME B16.18, which covers cast copper alloy pressure fittings. It provides requirements for fitting ends suitable for soldering. This Standard covers:\n\n(a) pressure temperature ratings;\n(b) abbreviations for end connections;\n(c) size and method of designating openings of fittings;\n(d) marking;\n(e) material;\n(f) dimension and tolerances; and\n(g) tests.”
B16.23 – 1992	“Cast Copper Alloy Solder Joint Drainage Fittings (DWV)The Standard establishes specifications for cast copper alloy solder joint drainage fittings, designed for use in drain, waste, and vent (DWV) systems. These fittings are designed for use with seamless copper tube conforming to ASTM B 306, Copper Drainage Tube (DWV), as well as fittings intended to be assembled with soldering materials conforming to ASTM B 32, or tapered pipe thread conforming to ASME B1.20.1. This standard is allied with ASME B16.29, Wrought Copper and Wrought Copper Alloy Solder Joint Drainage Fittings – DWV. It provides requirements for fitting ends suitable for soldering. This standard covers:\n\n(a) description;\n(b) pitch (slope);\n(c) abbreviations for end connections;\n(d) sizes and methods for designing openings for reducing fittings;\n(e) marking;\n(f) material; and\n(g) dimensions and tolerances.”
B16.24 – 1991 (R1998)	“Cast Copper Alloy Pipe Flanges and Flanged Fittings This Standard for Classes 25, 125, 250, and 800 Cast Iron Pipe Flanges and Flanged Fittings covers:\n\n(a) pressure temperature ratings,\n(b) sizes and methods of designating openings for reduced fittings,\n(c) marking,\n(d) minimum requirements for materials,\n(e) dimensions and tolerances,\n(f) bolt, nut, and gasket dimensions, and\n(g) tests.”
B16.25 – 1997	“Butt-welding Ends\n\nThe Standard covers the preparation of butt welding ends of piping components to be joined into a piping system by welding. It includes requirements for welding bevels, for external and internal shaping of heavy-wall components, and for preparation of internal ends (including dimensions and tolerances). Coverage includes preparation for joints with the following.\n(a) no backing rings;\n(b) split or non continuous backing rings;\n(c) solid or continuous backing rings;\n(d) consumable insert rings;\n(e) gas tungsten are welding (GTAW) of the root pass. Details of preparation for any backing ring must be specified in ordering the component.”
B16.26 – 1988	“Cast Copper Alloy Fittings for Flared Copper TubesThis standard for Cast Copper Alloy Fitting for Flared Copper Tubes covers:\n\n(a) pressure rating;\n(b) material;\n(c) size;\n(d) threading;\n(e) marking.”
B16.28 – 1994	“Wrought Steel Butt-welding Short Radius Elbows and ReturnsThis Standard covers ratings, overall dimensions, testing, tolerances, and markings for wrought carbon and alloy steel butt-welding short radius elbows and returns. The term wrought denotes fittings made of pipe, tubing, plate, or forgings.”
B16.29 – 1994	“Wrought Copper and Wrought Copper Alloy Solder Joint Drainage Fittings (DWV) The standard for wrought copper and wrought copper alloy solder joint drainage fittings, designed for use with copper drainage tube, covers:\n\n(a) Description,\n(b) Pitch (slope),\n(c) Abbreviations for End Connections,\n(d) Sizes and Method of Designating Openings for Reducing Fittings,\n(e) Marking,\n(f) Material,\n(g) Dimensions and Tolerances.”
B16.3 – 1998	“Malleable Iron Threaded Fittings This Standard for threaded malleable iron fittings Classes 150, and 300 provides requirements for the following:\n\n(a) pressure-temperature ratings\n(b) size and method of designating openings of reducing fittings\n(c) marking\n(d) materials\n(e) dimensions and tolerances\n(f) threading\n(g) coatings”
B16.33 – 1990	“Manually Operated Metallic Gas Valves for Use in Gas Piping Systems Up to 125 psigGeneral This Standard covers requirements for manually operated metallic valves sizes NPS 1.2 through NPS 2, for outdoor installation as gas shut-off valves at the end of the gas service line and before the gas regulator and meter where the designated gauge pressure of the gas piping system does not exceed 125 psi (8.6 bar). The Standard applies to valves operated in a temperature environment between .20 degrees F and 150 degrees F (.29 degrees C and 66 degrees C). Design This Standard sets forth the minimum capabilities, characteristics, and properties, which a valve at the time of manufacture must possess, in order to be considered suitable for use in gas piping systems.”
B16.34	“Valves – Flanged, Threaded, and Welding End”
B16.34 – 1996	“Valves – Flanged, Threaded, and Welding End This standard applies to new valve construction and covers pressure-temperature ratings, dimensions, tolerances, materials, nondestructive examination requirements, testing, and marking for cast, forged, and fabricated flanged, threaded, and welding end, and wafer or flange-less valves of steel, nickel-base alloys, and other alloys shown in Table 1. Wafer or flange-less valves, bolted or through-bolt types, that are installed between flanges or against a flange shall be treated as flanged end valves.”
B16.36 – 1996	“Orifice Flanges This Standard covers flanges (similar to those covered in ASME B16.5) that have orifice pressure differential connections. Coverage is limited to the following:\n\n(a) welding neck flanges Classes 300, 400, 600, 900, 1500, and 2500\n(b) slip-on and threaded Class 300\n\nOrifice, Nozzle and Venturi Flow Rate Meters”
B16.38 – 1985 (R1994)	“Large Metallic Valves for Gas DistributionThe standard covers only manually operated metallic valves in nominal pipe sizes 2 1/2 through 12 having the inlet and outlet on a common center line, which are suitable for controlling the flow of gas from open to fully closed, for use in distribution and service lines where the maximum gage pressure at which such distribution piping systems may be operated in accordance with the code of federal regulations (cfr), title 49, part 192, transportation of natural and other gas by pipeline; minimum safety standard, does not exceed 125 psi (8.6 bar). Valve seats, seals and stem packing may be nonmetallic.”
B16.39 – 1986 (R1998)	“Malleable Iron Threaded Pipe Unions This Standard for threaded malleable iron unions, classes 150, 250, and 300, provides requirements for the following:\n\n(a) design\n(b) pressure-temperature ratings\n(c) size\n(d) marking\n(e) materials\n(f) joints and seats\n(g) threads\n(h) hydrostatic strength\n(i) tensile strength\n(j) air pressure test\n(k) sampling\n(l) coatings\n(m) dimensions”
B16.4 – 1998	“Cast Iron Threaded FittingsThis Standard for gray iron threaded fittings, Classes 125 and 250 covers:\n\n(a) pressure-temperature ratings\n(b) size and method of designating openings of reducing fittings\n(c) marking\n(d) material\n(e) dimensions and tolerances\n(f) threading, and\n(g) coatings”
B16.40 – 1985 (R1994)	“Manually Operated Thermoplastic Gas The Standard covers manually operated thermoplastic valves in nominal sizes 1.2 through 6 (as shown in Table 5). These valves are suitable for use below ground in thermoplastic distribution mains and service lines. The maximum pressure at which such distribution piping systems may be operated is in accordance with the Code of Federal Regulation (CFR) Title 49, Part 192, Transportation of Natural and Other Gas by Pipeline; Minimum Safety Standards, for temperature ranges of .20 deg. F to 100 deg. F (.29 deg. C to 38 deg. C). This Standard sets qualification requirements for each nominal valve size for each valve design as a necessary condition for demonstrating conformance to this Standard. This Standard sets requirements for newly manufactured valves for use in below ground piping systems for natural gas [includes synthetic natural gas (SNG)], and liquefied petroleum (LP) gases (distributed as a vapor, with or without the admixture of air) or mixtures thereof.”
B16.42 – 1998	“Ductile Iron Pipe Flanges and Flanged Fittings, Classes 150 and 300 The Standard covers minimum requirements for Class 150 and 300 cast ductile iron pipe flanges and flanged fittings. The requirements covered are as follows:\n\n(a) pressure-temperature ratings\n(b) sizes and method of designating openings\n(c) marking\n(d) materials\n(e) dimensions and tolerances\n(f) blots, nuts, and gaskets\n(g) tests”
B16.44 – 1995	“Manually Operated Metallic Gas Valves for Use in House Piping SystemsThis Standard applies to new valve construction and covers quarter turn manually operated metallic valves in sizes NPS 1/2-2 which are intended for indoor installation as gas shutoff valves when installed in indoor gas piping between a gas meter outlet & the inlet connection to a gas appliance.”
B16.45 – 1998	“Cast Iron Fittings for Solvent Drainage Systems The Standard for cast iron drainage fittings used on self-aerating, one-pipe Solvent drainage systems, covers the following:\n(a) description\n(b) sizes and methods for designating openings for reducing fittings\n(c) marking\n(d) material\n(e) pitch\n(f) design\n(g) dimensions and tolerances\n(h) tests”
B16.47 – 1996	“Large Diameter Steel Flanges: NPS 26 through NPS 60 This Standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for pipe flanges in sizes NPS 26 through NPS 60 and in ratings Classes 75, 150,0300, 400, 600, and 900. Flanges may be cast, forged, or plate (for blind flanges only) materials. Requirements and recommendations regarding bolting and gaskets are also included.”
B16.48 – 1997	“Steel Line BlanksThe Standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for operating line blanks in sizes NPS 1/2 through NPS 24 for installation between ASME B16. 5 flanges in the 150, 300, 600, 900, 1500, and 2500 pressure classes.”
B16.49 – 2000	“Factory-Made Wrought Steel Butt-welding Induction Bends for Transportation and Distribution Systems This Standard covers design, material, manufacturing, testing, marking, and inspection requirements for factory-made pipeline bends of carbon steel materials having controlled chemistry and mechanical properties, produced by the induction bending process, with or without tangents. This Standard covers induction bends for transportation and distribution piping applications (e.g., ASME B31.4, B31.8, and B31.11) Process and power piping have differing requirements and materials that may not be appropriate for the restrictions and examinations described herein, and therefore are not included in this Standard.”
B16.5 – 1996	Pipe Flanges and Flanged Fittings. The ASME B16.5 – 1996 Pipe Flanges and Flange Fittings standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, testing, and methods of designating openings for pipe flanges and flanged fittings. The standard includes flanges with rating class designations 150, 300, 400, 600, 900, 1500, and 2500 in sizes NPS 1/2 through NPS 24, with requirements given in both metric and U.S units. The Standard is limited to flanges and flanged fittings made from cast or forged materials, and blind flanges and certain reducing flanges made from cast, forged, or plate materials. Also included in this Standard are requirements and recommendations regarding flange bolting, flange gaskets, and flange joints.
B16.9 – 2001	“Factory-Made Wrought Steel Butt-welding Fittings,This Standard covers overall dimensions tolerancesratings testing”
B31	“Standards of Pressure PipingB31 Code for pressure piping, developed by American Society of Mechanical Engineers – ASME, covers Power Piping, Fuel Gas Piping, Process Piping, Pipeline Transportation Systems for Liquid Hydrocarbons and Other Liquids, Refrigeration Piping and Heat Transfer Components and Building Services Piping. ASME B31 was earlier known as ANSI B31.”
B31.1 – 2012	“Power PipingPiping for industrial plants and marine applications. This code prescribes minimum requirements for the design, materials, fabrication, erection, test, and inspection of power and auxiliary service piping systems for electric generation stations, industrial institutional plants, central and district heating plants.\n\nThe code covers boiler external piping for power boilers and high temperature, high pressure water boilers in which steam or vapor is generated at a pressure of more than 15 PSIG; and high temperature water is generated at pressures exceeding 160 PSIG and/or temperatures exceeding 250 degrees F.”
B31.11 – 2002	Slurry Transportation Piping Systems Design, construction, inspection, security requirements of slurry piping systems.Covers piping systems that transport aqueous slurries of no hazardous materials, such as coal, mineral ores and other solids between a slurry processing plant and the receiving plant. Gaseous and liquid hydrogen service and to pipelines in gaseous hydrogen service.
B31.12 – 2011	“Hydrogen Piping and Pipelines”
B31.2 – 1968	“Fuel Gas PipingThis has been withdrawn as a National Standard and replaced by ANSI/NFPA Z223.1, but B31.2 is still available from ASME and is a good reference for the design of gas piping systems (from the meter to the appliance).”
B31.3 – 2012	“Process PipingDesign of chemical and petroleum plants and refineries processing chemicals and hydrocarbons, water and steam. This Code contains rules for piping typically found in petroleum refineries; chemical, pharmaceutical, textile, paper, semiconductor, and cryogenic plants; and related processing plants and terminals.\n\nThis Code prescribes requirements for materials and components, design, fabrication, assembly, erection, examination, inspection, and testing of piping. This Code applies to piping for all fluids including:\n(1) raw, intermediate, and finished chemicals;\n(2) petroleum products;\n(3) gas, steam, air and water;\n(4) fluidized solids;\n(5) refrigerants; and\n(6) cryogenic fluids. Also included is piping which interconnects pieces or stages within a packaged equipment assembly.”
B31.4 – 2012	“Pipeline Transportation Systems for Liquid Hydrocarbons and Other Liquids.This Code prescribes requirements for the design, materials, construction, assembly, inspection, and testing of piping transporting liquids such as crude oil, condensate, natural gasoline, natural gas liquids, liquefied petroleum gas, carbon dioxide, liquid alcohol, liquid anhydrous ammonia and liquid petroleum products between producers’ lease facilities, tank farms, natural gas processing plants, refineries, stations, ammonia plants, terminals (marine, rail and truck) and other delivery and receiving points.\n\nPiping consists of pipe, flanges, bolting, gaskets, valves, relief devices, fittings and the pressure containing parts of other piping components. It also includes hangers and supports, and other equipment items necessary to prevent overstressing the pressure containing parts. It does not include support structures such as frames of buildings, buildings stanchions or foundations\n\nRequirements for offshore pipelines are found in Chapter IX. Also included within the scope of this Code are:\n(A) Primary and associated auxiliary liquid petroleum and liquid anhydrous ammonia piping at pipeline terminals (marine, rail and truck), tank farms, pump stations, pressure reducing stations and metering stations, including scraper traps, strainers, and prover loop;\n(B) Storage and working tanks including pipe-type storage fabricated from pipe and fittings, and piping interconnecting these facilities;\n(C) Liquid petroleum and liquid anhydrous ammonia piping located on property which has been set aside for such piping within petroleum refinery, natural gasoline, gas processing, ammonia, and bulk plants;\n(D) Those aspects of operation and maintenance of liquid pipeline systems relating to the safety and protection of the general public, operating company personnel, environment, property and the piping systems.”
B31.5 – 2013	“Refrigeration Piping and Heat Transfer Components. This Code prescribes requirements for the materials, design, fabrication, assembly, erection, test, and inspection of refrigerant, heat transfer components, and secondary coolant piping for temperatures as low as -320 deg F (-196 deg C), whether erected on the premises or factory assembled, except as specifically excluded in the following paragraphs.\n\nUsers are advised that other piping Code Sections may provide requirements for refrigeration piping in their respective jurisdictions.\n\nThis Code shall not apply to:\n(a) any self- contained or unit systems subject to the requirements of Underwriters Laboratories or other nationally recognized testing laboratory:\n(b) water piping;\n(c) piping designed for external or internal gage pressure not exceeding 15 psi (105 kPa) regardless of size; or\n(d) pressure vessels, compressors, or pumps,\n\nbut does include all connecting refrigerant and secondary coolant piping starting at the first joint adjacent to such apparatus.”
B31.8 – 2012	“Gas Transmission and Distribution Piping Systems. This Code covers the design, fabrication, installation, inspection, and testing of pipeline facilities used for the transportation of gas. This Code also covers safety aspects of the operation and maintenance of those facilities.”
B31.8S – 2012	“Managing System Integrity of Gas PipelinesThis Standard applies to on-shore pipeline systems constructed with ferrous materials and that transport gas.\n\nPipeline system means all parts of physical facilities through which gas is transported, including pipe, valves, appurtenances attached to pipe, compressor units, metering stations, regulator stations, delivery stations, holders and fabricated assemblies.\n\nThe principles and processes embodied in integrity management are applicable to all pipeline systems. This Standard is specifically designed to provide the operator (as defined in section 13) with the information necessary to develop and implement an effective integrity management program utilizing proven industry practices and processes.\n\nThe processes and approaches within this Standard are applicable to the entire pipeline system.”
B31.9 – 2011	“Building Services PipingThis Code Section has rules for the piping in industrial, institutional, commercial and public buildings, and multi-unit residences, which does not require the range of sizes, pressures, and temperatures covered in B31.1.\n\nThis Code prescribes requirements for the design, materials, fabrication, installation, inspection, examination and testing of piping systems for building services. It includes piping systems in the building or within the property limits.”
B31G – 2009	“Manual for Determining Remaining Strength of Corroded PipelinesA supplement To B31 Code-Pressure Piping”
B462	“Standard Specification for Forged or Rolled UNS N08020, UNS N08024, UNS N08026, UNS N08367, and UNS R20033 Alloy Pipe Flanges, Forged Fittings, and Valves and Parts for Corrosive High-Temperature Service”
B834	“Standard Specification for Pressure Consolidated Powder Metallurgy Iron-Nickel- Chromium-Molybdenum (UNS N08367) and Nickel- Chromium Molybdenum Columbium (Nb) (UNS N06625) Alloy Pipe Flanges, Fittings, Valves, and Parts”
D5500	“Standard Test Method for Vehicle Evaluation of Unleaded Automotive Spark-ignition Engine Fuel for Intake Valve Deposit Formation”
F1020	“Standard Specification for Line-Blind Valves for marine Applications El-1996 RI’1996)”
F1098	“Standard Specification for Envelope Dimensions for Butterfly Valves – NPS 2 to 24 EI-1993 R(1993)”
F1271	“Standard Specification for Spill Valves for Use in Marine Tank Liquid Overpressure Protections Applications EI-1995 R (1995)”
F1370	“Standard Specification for Pressure Reducing valves for Water Systems, Shipboard”
F1508	“Standard Specification for Angle Style, Pressure Relief Valves for Steam, Gas, and Liquid Services”
F1565	“Standard Specification for Pressure-Reducing Valves for Steam Service”
F1792	“Standard Specification for Special Requirements for Valves Used in Gaseous Oxygen Service”
F1793	“Standard Specification for Automatic Shut-Off Valves (Also Known as Excess Flow Valves, EFV) for Air or Nitrogen Service”
F1794	“Standard Specification for Hand operated, Globe-Style Valves for Gas (Except Oxygen Gas), and Hydraulic Systems”
F1795	“Standard specification for Pressure-Reducing Valves for Air or Nitrogen Systems”
F885	“Standard Specification for Envelope Dimensions for Bronze Globe Valves NPS 1/4 to 2 El-1996 R(1996)”
F992	“Standard Specification for Valve Label Plates El-1997 R(1997)”
F993	“Standard Specification for Valve Locking Devices El-1997 R(1997)”

by PipeAdmin
Tags: acronyms, electrical, Electrician

Feb 8, 2018

Standards – ASTM

Steel Pipes
A53 – A53/A53M-99b	Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
A74 – A74-98	Specification for Cast Iron Soil Pipe and Fittings
A106 – A106-99e1	Specification for Seamless Carbon Steel Pipe for High-Temperature Service
A126 – A126-95e1	Specification for Grey Iron Castings for Valves, Flanges, and Pipe Fittings
A134 – A134-96	Specification for Pipe, Steel, Electric-Fusion (Arc)-Welded (Sizes NPS 16 and Over)
A135 – A135-97c	Specification for Electric-Resistance-Welded Steel Pipe
A139 – A139-96e1	Specification for Electric-Fusion (Arc)-Welded Steel Pipe (NPS 4 and Over)
A182 – A182/A182M-99	Specification for Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
A252 – A252-98	Specification for Welded and Seamless Steel Pipe Piles
A312 – A312/A312M-00	Specification for Seamless and Welded Austenitic Stainless Steel Pipes
A333 – A333/A333M-99	Specification for Seamless and Welded Steel Pipe for Low-Temperature Service
A335 – A335/A335M-99	Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
A338 – A338-84 (1998)	Specification for Malleable Iron Flanges, Pipe Fittings, and Valve Parts for Railroad, Marine, and Other Heavy Duty Service at Temperatures Up to 650°F (345°C)
A358 – A358/A358M-98	Specification for Electric-Fusion-Welded Austenitic Chromium-Nickel Alloy Steel Pipe for High-Temperature Service
A369 – A369/A369M-92	Specification for Carbon and Ferritic Alloy Steel Forged and Bored Pipe for High-Temperature Service
A376 – A376/A376M-98	Specification for Seamless Austenitic Steel Pipe for High-Temperature Central-Station Service
A377 – A377-99	Index of Specifications for Ductile-Iron Pressure Pipe
A409 – A409/A409M-95ae1	Specification for Welded Large Diameter Austenitic Steel Pipe for Corrosive or High-Temperature Service
A426 – A426-92 (1997)	Specification for Centrifugally Cast Ferritic Alloy Steel Pipe for High-Temperature Service
A451 – A451-93 (1997)	Specification for Centrifugally Cast Austenitic Steel Pipe for High-Temperature Service
A523 – A523-96	Specification for Plain End Seamless and Electric-Resistance-Welded Steel Pipe for High-Pressure Pipe-Type Cable Circuits
A524 – A524-96	Specification for Seamless Carbon Steel Pipe for Atmospheric and Lower Temperatures
A530 – A530/A530M-99	Specification for General Requirements for Specialized Carbon and Alloy Steel Pipe
A648 – A648-95e1	Specification for Steel Wire, Hard Drawn for Pre-stressing Concrete Pipe
A674 – A674-95	Practice for Polyethylene Encasement for Ductile Iron Pipe for Water or Other Liquids
A691 – A691-98	Specification for Carbon and Alloy Steel Pipe, Electric-Fusion-Welded for High-Pressure Service at High Temperatures
A694 – A694/A694M-00	Specification for Carbon and Alloy Steel Forgings for Pipe Flanges, Fittings, Valves, and Parts for High-Pressure Transmission Service
A716 – A716-99	Specification for Ductile Iron Culvert Pipe
A733 – A733-99	Specification for Welded and Seamless Carbon Steel and Austenitic Stainless Steel Pipe Nipples
A742 – A742/A742M-98	Specification for Steel Sheet, Metallic Coated and Polymer Pre-coated for Corrugated Steel Pipe
A746 – A746-99	Specification for Ductile Iron Gravity Sewer Pipe
A760 – A760/A760M-99	Specification for Corrugated Steel Pipe, Metallic-Coated for Sewers and Drains
A761 – A761/A761M-98	Specification for Corrugated Steel Structural Plate, Zinc-Coated, for Field-Bolted Pipe, Pipe-Arches, and Arches
A762 – A762/A762M-98	Specification for Corrugated Steel Pipe, Polymer Pre-coated for Sewers and Drains
A790 – A790/A790M-99	Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe
A796 – A796/A796M-99	Practice for Structural Design of Corrugated Steel Pipe, Pipe-Arches, and Arches for Storm and Sanitary Sewers and Other Buried Applications
A798 – A798/A798M-97a	Practice for Installing Factory-Made Corrugated Steel Pipe for Sewers and Other Applications
A807 – A807/A807M-97	Practice for Installing Corrugated Steel Structural Plate Pipe for Sewers and Other Applications
A810 – A810-94	Specification for Zinc-Coated (Galvanized) Steel Pipe Winding Mesh
A813 – A813/A813M-95e2	Specification for Single- or Double-Welded Austenitic Stainless Steel Pipe
A814 – A814/A814M-96 (1998)	Specification for Cold-Worked Welded Austenitic Stainless Steel Pipe
A849 – A849-99	Specification for Post-Applied Coatings, Pavings, and Linings for Corrugated Steel Sewer and Drainage Pipe
A861 – A861-94e1	Specification for High-Silicon Iron Pipe and Fittings
A862 – A862/A862M-98	Practice for Application of Asphalt Coatings to Corrugated Steel Sewer and Drainage Pipe
A865 – A865-97	Specification for Threaded Couplings, Steel, Black or Zinc-Coated (Galvanized) Welded or Seamless, for Use in Steel Pipe Joints
A872 – A872-91 (1997)	Specification for Centrifugally Cast Ferritic/Austenitic Stainless Steel Pipe for Corrosive Environments
A885 – A885/A885M-96	Specification for Steel Sheet, Zinc and Aramid Fiber Composite Coated for Corrugated Steel Sewer, Culvert, and Underdrain Pipe
A888 – A888-98e1	Specification for Hubless Cast Iron Soil Pipe and Fittings for Sanitary and Storm Drain, Waste, and Vent Piping Applications
A926 – A926-97	Test Method for Comparing the Abrasion Resistance of Coating Materials for Corrugated Metal Pipe
A928 – A928/A928M-98	Specification for Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric Fusion Welded with Addition of Filler Metal
A929 – A929/A929M-97	Specification for Steel Sheet, Metallic-Coated by the Hot-Dip Process for Corrugated Steel Pipe
A930 – A930-99	Practice for Life-Cycle Cost Analysis of Corrugated Metal Pipe Used for Culverts, Storm Sewers, and Other Buried Conduits
A943 – A943/A943M-95e1	Specification for Spray-Formed Seamless Austenitic Stainless Steel Pipes
A949 – A949/A949M-95e1	Specification for Spray-Formed Seamless Ferritic/Austenitic Stainless Steel Pipe
A954 – A954-96	Specification for Austenitic Chromium-Nickel-Silicon Alloy Steel Seamless and Welded Pipe
A972 – A972/A972M-99	Specification for Fusion Bonded Epoxy-Coated Pipe Piles
A978 – A978/A978M-97	Specification for Composite Ribbed Steel Pipe, Precoated and Polyethylene Lined for Gravity Flow Sanitary Sewers, Storm Sewers, and Other Special Applications
A984 – A984/A984M-00	Specification for Steel Line Pipe, Black, Plain-End, Electric-Resistance-Welded
A998 – A998/A998M-98	Practice for Structural Design of Reinforcements for Fittings in Factory-Made Corrugated Steel Pipe for Sewers and Other Applications
A999 – A999/A999M-98	Specification for General Requirements for Alloy and Stainless Steel Pipe
A1005 – A1005/A1005M-00	Specification for Steel Line Pipe, Black, Plain End, Longitudinal and Helical Seam, Double Submerged-Arc Welded
A1006 – A1006/A1006M-00	Specification for Steel Line Pipe, Black, Plain End, Laser Beam Welded
A178 – A178/A178M-95	Specification for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes
A179 – A179/A179M-90a (1996) e1	Specification for Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes
A192 – A192/A192M-91 (1996) e1	Specification for Seamless Carbon Steel Boiler Tubes for High-Pressure Service
A209 – A209/A209M-98	Specification for Seamless Carbon-Molybdenum Alloy-Steel Boiler and Superheater Tubes
A210 – A210/A210M-96	Specification for Seamless Medium-Carbon Steel Boiler and Superheater Tubes
A213 – A213/A213M-99a	Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
A249 – A249/A249M-98e1	Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
A250 – A250/A250M-95	Specification for Electric-Resistance-Welded Ferritic Alloy-Steel Boiler and Superheater Tubes
A254 – A254-97	Specification for Copper-Brazed Steel Tubing
A268 – A268/A268M-96	Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
A269 – A269-98	Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service
A270 – A270-98ae1	Specification for Seamless and Welded Austenitic Stainless Steel Sanitary Tubing
A334 – A334/A334M-99	Specification for Seamless and Welded Carbon and Alloy-Steel Tubes for Low-Temperature Service
A423 – A423/A423M-95	Specification for Seamless and Electric-Welded Low-Alloy Steel Tubes
A450 – A450/A450M-96a	Specification for General Requirements for Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes
A608 – A608-91a (1998)	Specification for Centrifugally Cast Iron-Chromium-Nickel High-Alloy Tubing for Pressure Application at High Temperatures
A618 – A618-99	Specification for Hot-Formed Welded and Seamless High-Strength Low-Alloy Structural Tubing
A632 – A632-98	Specification for Seamless and Welded Austenitic Stainless Steel Tubing (Small-Diameter) for General Service
A688 – A688/A688M-98	Specification for Welded Austenitic Stainless Steel Feedwater Heater Tubes
A771 – A771/A771M-95	Specification for Seamless Austenitic and Martensitic Stainless Steel Tubing for Liquid Metal-Cooled Reactor Core Components
A778 – A778-98	Specification for Welded, Unanneled Austenitic Stainless Steel Tubular Products
A789 – A789/A789M-00	Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service
A803 – A803/A803M-98	Specification for Welded Ferritic Stainless Steel Feedwater Heater Tubes
A822 – A822-90 (1995) e1	Specification for Seamless Cold-Drawn Carbon Steel Tubing for Hydraulic System Service
A826 – A826/A826M-95	Specification for Seamless Austenitic and Martensitic Stainless Steel Duct Tubes for Liquid Metal-Cooled Reactor Core Components
A847 – A847-99a	Specification for Cold-Formed Welded and Seamless High Strength, Low Alloy Structural Tubing with Improved Atmospheric Corrosion Resistance
A908 – A908-91 (1998)	Specification for Stainless Steel Needle Tubing
A953 – A953-96	Specification for Austenitic Chromium-Nickel-Silicon Alloy Steel Seamless and Welded Tubing
Heat-Exchanger and Condenser Tubes
A179 – A179/A179M-90a (1996) e1	Specification for Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes
A213 – A213/A213M-99a	Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
A214 – A214/A214M-96	Specification for Electric-Resistance-Welded Carbon Steel Heat-Exchanger and Condenser Tubes
A249 – A249/A249M-98e1	Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
A498 – A498-98	Specification for Seamless and Welded Carbon, Ferritic, and Austenitic Alloy Steel Heat-Exchanger Tubes with Integral Fins
A851 – A851-96	Specification for High-Frequency Induction Welded, Unannealed, Austenitic Steel Condenser Tubes
Structural Tubing
A500 – A500-99	Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes
A501 – A501-99	Specification for Hot-Formed Welded and Seamless Carbon Steel Structural Tubing
A847 – A847-99a	Specification for Cold-Formed Welded and Seamless High Strength, Low Alloy Structural Tubing with Improved Atmospheric Corrosion Resistance
A618 – A618-99	Specification for Hot-Formed Welded and Seamless High-Strength Low-Alloy Structural Tubing
Mechanical Tubing
A511 – A511-96	Specification for Seamless Stainless Steel Mechanical Tubing
A512 – A512-96	Specification for Cold-Drawn Buttweld Carbon Steel Mechanical Tubing
A513 – A513-98	Specification for Electric-Resistance-Welded Carbon and Alloy Steel Mechanical Tubing
A519 – A519-96	Specification for Seamless Carbon and Alloy Steel Mechanical Tubing
A554 – A554-98e1	Specification for Welded Stainless Steel Mechanical Tubing
Welded Fittings
A234 – A234/A234M-99	Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service
A403 – A403/A403M-99a	Specification for Wrought Austenitic Stainless Steel Piping Fittings
A420 – A420/A420M-99	Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service
A758 – A758/A758M-98	Specification for Wrought-Carbon Steel Butt-Welding Piping Fittings with Improved Notch Toughness
A774 – A774/A774M-98	Specification for As-Welded Wrought Austenitic Stainless Steel Fittings for General Corrosive Service at Low and Moderate Temperatures
Valves
A126-04	Standard Specification for Gray Iron Castings for Valves, Flanges, and Pipe Fittings
A182/A182M-04	Standard Specification for Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
A338	Standard Specification for Malleable Iron Flanges, Pipe Fittings, and Valve Parts for Railroad, Marine, and Other Heavy Duty Service at Temperatures Up to 650ï¿½F (345ï¿½C)
A522/A522M-01	Standard Specification for Forged or Rolled 8 and 9% Nickel Alloy Steel Flanges, Fittings, Valves, and Parts for Low-Temperature Service
A694/A694M-03	Standard Specification for Carbon and Alloy Steel Forgings for Pipe Flanges, Fittings, Valves, and Parts for High-Pressure Transmission Service
A961-04	Standard Specification for Common Requirements for Steel Flanges, Forged Fittings, Valves, and Parts for Piping Applications
A988/A988M	Standard Specification for Hot Isostatically-Pressed Stainless Steel Flanges, Fittings, Valves, and Parts for High Temperature Service
A989/A989M	Standard Specification for Hot Isostatically-Pressed Alloy Steel Flanges, Fittings, Valves, and Parts for High Temperature Service
B61-2	Standard Specification for Steam or Valve Bronze Castings
B763	Standard Specification for Copper Alloy Sand Castings for Valve Application
B834	Standard Specification for Pressure Consolidated Powder Metallurgy Iron-Nickel-Chromium-Molybdenum (UNS N08367) and Nickel-Chromium-Molybdenum-Columbium (Nb) (UNS N06625) Alloy Pipe Flanges, Fittings, Valves, and Parts
C1129	Standard Practice for Estimation of Heat Savings by Adding Thermal Insulation to Bare Valves and Flanges
F885	Standard Specification for Envelope Dimensions for Bronze Globe Valves NPS 1/4 to 2
F992	Standard Specification for Valve Label Plates
F993	Standard Specification for Valve Locking Devices
F1020	Standard Specification for Line-Blind Valves for Marine Applications
F1030	Standard Practice for Selection of Valve Operators
F1098	Standard Specification for Envelope Dimensions for Butterfly Valves-NPS 2 to 24
F1271	Standard Specification for Spill Valves for Use in Marine Tank Liquid Overpressure Protections Applications
F1370	Standard Specification for Pressure-Reducing Valves for Water Systems, Shipboard
F1394	Standard Test Method for Determination of Particle Contribution from Gas Distribution System Valves
F1565	Standard Specification for Pressure-Reducing Valves for Steam Service
F1792	Standard Specification for Special Requirements for Valves Used in Gaseous Oxygen Service
F1793	Standard Specification for Automatic Shut-Off Valves (Also Known as Excess Flow Valves, EFV) for Air Or Nitrogen Service
F1794	Standard Specification for Hand-Operated, Globe-Style Valves for Gas (Except Oxygen Gas), and Hydraulic Systems
F1795	Standard Specification for Pressure-Reducing Valves for Air or Nitrogen Systems
F1802	Standard Test Method for Performance Testing of Excess Flow Valves
F1970	Standard Specification for Special Engineered Fittings, Appurtenances or Valves for use in Poly (Vinyl Chloride) (PVC) or Chlorinated Poly (Vinyl Chloride) (CPVC) Systems
F1985	Standard Specification for Pneumatic-Operated, Globe-Style, Control Valves
F2138	Standard Specification for Excess Flow Valves for Natural Gas Service
F2215	Standard Specification for Balls, Bearings, Ferrous and Nonferrous for Use in Bearings, Valves, and Bearing Applications
F2324	Standard Test Method for Prerinse Spray Valves

by PipeAdmin
Tags: acronyms, electrical, Electrician

Feb 8, 2018

Standards – API

Standard	Description
API SPEC 6D	Specification for Pipeline Valves. API Specification 6D is an adoption of ISO 14313: 1999, Petroleum and Natural Gas Industries-Pipeline Transportation Systems-Pipeline Valves. This International Standard specifies requirements and gives recommendations for the design, manufacturing, testing and documentation of ball, check, gate and plug valves for application in pipeline systems.
API 526	Flanged Steel Pressure Relief Valves. The standard is a purchase specification for flanged steel pressure relief valves. Basic requirements are given for direct spring-loaded pressure relief valves and pilot-operated pressure relief valves as follows: orifice designation and area; valve size and pressure rating, inlet and outlet; materials; pressure-temperature limits; and center-to-face dimensions, inlet and outlet.
API 527	Seat Tightness of Pressure Relief Valves R(2002). Describes methods of determining the seat tightness of metal- and soft-seated pressure relief valves, including those of conventional, bellows, and pilot-operated designs.
ANSI/API STD 594	Check Valves: Flanged, Lug, Wafer and Butt-welding. API Standard 594 covers design, material, face-to-face dimensions, pressure-temperature ratings, and examination, inspection, and test requirements for two types of check valves.
API 598	Valve Inspection and Testing. The standard covers inspection, supplementary examination, and pressure test requirements for both resilient-seated and metal-to-metal seated gate, globe, plug, ball, check, and butterfly valves. Pertains to inspection by the purchaser and to any supplementary examinations the purchaser may require at the valve manufacturer’s plant.
ANSI/API 599	Metal Plug Valves – Flanged, Threaded and Welding Ends. A purchase specification that covers requirements for metal plug valves with flanged or butt-welding ends, and ductile iron plug valves with flanged ends, in sizes NPS 1 through NPS 24, which correspond to nominal pipe sizes in ASME B36.10M. Valve bodies conforming to ASME B16.34 may have flanged end and one butt-welding end. It also covers both lubricated and nonlubricated valves that have two-way coaxial ports, and includes requirements for valves fitted with internal body, plug, or port linings or applied hard facings on the body, body ports, plug, or plug port.
ANSI/API 600	Bolted Bonnet Steel Gate Valves for Petroleum and Natural Gas Industries – Modified National Adoption of ISO 10434:1998.
API 602	Compact Steel Gate Valves – Flanged, Threaded, Welding, and Extended-Body Ends. The standard covers threaded-end, socket-welding-end, butt-welding-end, and flanged-end compact carbon steel gate valves in sizes NPS4 and smaller.
ANSI/API 603	Corrosion-Resistant, Bolted Bonnet Gate Valves – Flanged and Butt-Welding Ends. The standard covers corrosion-resistant bolted bonnet gate valves with flanged or butt-weld ends in sizes NPS 1/2 through 24, corresponding to nominal pipe sizes in ASME B36.10M, and Classes 150, 300, and, 600, as specified in ASME B16.34.
ANSI/API 607	Fire Test for Soft-Seated Quarter Turn Valves. The standard covers the requirements for testing and evaluating the performance of straightway, soft-seated quarter-turn valves when the valves are exposed to certain fire conditions defined in this standard. The procedures described in this standard apply to all classes and sizes of such valves that are made of materials listed in ASME B16.34.
API 609	Butterfly Valves: Double Flanged, Lug- and Wafer-Type. The standard covers design, materials, face-to-face dimensions, pressure-temperature ratings, and examination, inspection, and test requirements for gray iron, ductile iron, bronze, steel, nickel-base alloy, or special alloy butterfly valves that provide tight shutoff in the closed position and are suitable for flow regulation.
API 6FA	Specification for Fire Test for Valves. The standard covers the requirements for testing and evaluating the performance of API Spec 6A and Spec 6D valves when exposed to specifically defined fire conditions.
API 6FC	Fire Test for Valve with Automatic Backseats. The standard covers the requirements for testing and evaluating the performance of API Spec 6A and Spec 6D valves with automatic backseats when exposed to specifically defined fire conditions.
API 6RS	Referenced Standards for Committee 6, Standardization of Valves and Wellhead Equipment.
API 11V6	Design of Continuous Flow Gas Lift Installations Using Injection Pressure Operated Valves. The standard sets guidelines for continuous flow gas lift installation designs using injection pressure operated valves.
ANSI/API RP 11V7	Recommended Practice for Repair, Testing, and Setting Gas Lift Valves. The standard applies to repair, testing, and setting gas lift valves and reverse flow (check) valves.
API 520-1	Sizing, Selection, and Installation of Pressure-Relieving Devices in Refineries: Part I – Sizing and Selection. The recommended practice applies to the sizing and selection of pressure relief devices used in refineries and related industries for equipment that has a maximum allowable working pressure of 15 psig (1.03 bar g or 103 kPa g) or greater.
API 520-2	Recommended Practice 520: Sizing, Selection, and Installation of Pressure-Relieving Devices in Refineries-Part II, Installation. The recommended practice covers methods of installation for pressure-relief devices for equipment that has a maximum allowable working pressure of 15 psig (1.03 bar g or 103 kPa g) or greater. It covers gas, vapor, steam, two-phase and incompressible fluid service.
ANSI/API 574	Inspection Practices for Piping System Components. The standard covers the inspection of piping, tubing, valves (other than control valves) and fittings used in petroleum refineries.
ANSI/API 576	Inspection of Pressure Relieving Devices. The recommended practice describes the inspection and repair practices for automatic pressure-relieving devices commonly used in the oil and petrochemical industries.
ANSI/API 608	Metal Ball Valves – Flanged and Butt-Welding Ends. The standard covers Class 150 and Class 300 metal ball valves that have either butt-welding or flanged ends and are for use in on-off service.

by PipeAdmin
Tags: acronyms, electrical, Electrician

Feb 8, 2018

Standards – BSi

BS 1387, Publication date:1985-10-31
Specification for screwed and socketed steel tubes and tubulars and for plain end steel tubes suitable for welding or for screwing to BS 21 pipe threads. Replaced by BS EN 10255:2004 Non-alloy steel tubes suitable for welding or threading
BS 1113, Publication date:1999-11-15
Specification for design and manufacture of water-tube steam generating plant (including superheaters, reheaters and steel tube economizers)
BS 1123-1:1990
Safety valves, gauges and fusible plugs for compressed air or inert gas installations – Code of practice for installation
BS 1127-2, Publication date:1990-06-29
Screwing dies and dienuts – Specification for hand- and machine-operated circular screwing dies for taper pipe threads; R Series
BS 1127-3, Publication date:1990-06-29
Screwing dies and dienuts – Specification for hand- and machine-operated circular screwing dies for parallel pipe threads; G series
BS 1212-1:1990
Float operated valves – Specification for piston type float operated valves (copper alloy body) (excluding floats)
BS 1212-3:1990
Float operated valves – Specification for diaphragm type float operated valves (plastics bodied) for cold water services only (excluding floats)
BS 1212-4:1990
Float operated valves – Specification for compact type float operated valves for WC flushing cisterns (including floats)
BS 143 and 1256, Publication date:2000-03-15
Threaded pipe fittings in malleable cast iron and cast copper alloy
BS 1471:1995
Specification for wrought aluminium and aluminum alloys for general engineering purposes – drawn tube
BS 1552:2004
Specification for open bottomed taper plug valves for 1st, 2nd and 3rd family gases up to 200 mbar
BS 1570:1960
Flanged and but weld-welding end steel plug valves for the petroleum industry (excluding well -head and flow-line valves)
BS 1600, Publication date:1992-01-31
Specification for dimensions of steel pipe for the petroleum industry
BS 1640-1, Publication date:1962-12-12
Specification for steel butt-welding pipe fittings for the petroleum industry – Wrought carbon and ferritic alloy steel fittings
BS 1640-2, Publication date:1962-12-12
Specification for steel butt-welding pipe fittings for the petroleum industry – Wrought and cast austenitic chromium-nickel steel fittings
BS 1640-3, Publication date:1968-03-22
Specification for steel butt-welding pipe fittings for the petroleum industry – Wrought carbon and ferritic alloy steel fittings – Metric units
BS 1640-4, Publication date:1968-03-21
Specification for steel butt-welding pipe fittings for the petroleum industry – Wrought and cast austenitic chromium-nickel steel fittings – Metric units
BS 1735:1966
Flanged cast iron outside-screw-and-yoke wedge gate valve, class 125, sizes 1 1/3 in to 24 in, for the petroleum industry
BS 1740 P1:1990
Wrought steel pipe fittings (screwed BSP threads) – Part1. Metric units
BS 1868:1975
Specification for steel check valves (flanged and butt-welding ends) for the petroleum, petrochemical and allied industries
BS 1873:1975
Specification for steel globe and globe stop and check valves (flanged and butt-welding ends) for the petroleum, petrochemical and allied industries
BS 1965 P1:1983
Butt welding pipe fittings for pressure purposes – Part 1. Carbon Steel
BS 1968:1953
Specification for floats for ball valves (copper)
BS 2051-1, Publication date:1973-10-20
Tube and pipe fittings for engineering purposes – Copper and copper alloys capillary and compression tube fittings for engineering purposes
BS 2051-2, Publication date:1984-02-29
Tube and pipe fittings for engineering purposes – Specification for olive type copper alloy compression tube fittings
BS 21, Publication date:1985-09-30
Specification for pipe threads for tubes and fittings where pressure-tight joints are made on the threads (metric dimensions)
BS 2456:1990
Specification for floats (plastics) for float operated valves for cold water services
BS 2494:1997
Specification for elastomeric seals for joints in pipe work and pipelines
BS 2598-4, Publication date:1980-04-30
Glass plant, pipeline and fittings – Specification for glass plant components
BS 2779:1986
Pipe threads for tubes & fittings where pressure-tight joints are not made on the threads (metric dimensions)
BS 2782 P1 METH 121A-121C:1996
Methods of testing plastics – Part 1. Thermal properties -methods 121A to 121C. Determination of temperature of deflection under load of plastics and ebonite
BS 2879:1980
Specification for draining taps (screw-down pattern)
BS 2L 116:1985
Specification for tube of 99% aluminium (cold drawn, seamless, not tested hydraulically) (not exceeding 12 mm wall thickness)
BS 2L 503, Publication date:1973-03-15
Specification for tube of magnesium-6% aluminium-zinc alloy (Al 6.0, Zn 1.0)
BS 2L 509, Publication date:1973-03-15
Specification for tube of magnesium-1% zinc-zirconium alloy (suitable for welding by inert-gas shielded arc techniques) (Zn 1.25, Zr 0.6)
BS 2T 57, Publication date:1972-10-27
Specification for 4/1 nickel-chromium steel tube (1150 N/mmUP2)
BS 2T 66, Publication date:1980-02-29
Specification for 18/10 chromium-nickel corrosion-resisting steel tube (niobium stabilized: 550 MPa) (weldable)
BS 2T 68, Publication date:1980-02-29
Specification for cold drawn 18/10 chromium-nickel corrosion-resisting steel tube (niobium stabilized: 800 MPa) (weldable)
BS 3074, Publication date:1990-03-30
Specification for nickel and nickel alloys: seamless tube
BS 341-1:1991
Transportable gas container valves. Specification for industrial valves for working pressures up to and including 300 bar (REPLACED by BS EN 14189:2003) , BS 341-3:2002) , BS EN 849:1997) , BS EN ISO 13340:2001) , BS EN ISO 14246:2001) , BS 341-4:2004)
BS 341-2:1963
Transportable Gas Container Valves. Valves with Taper Stems for Use with Breathing Apparatus. (REPLACED by BS 341-1:1991) , BS EN 849:1997) , BS EN ISO 12209-1:2001) , BS EN ISO 12209-2:2001) , BS EN ISO 12209-3:2001)
BS 341-3:2002
Transportable gas container valves. Valve outlet connections
BS 341-4:2004
Transportable gas container valves. Pressure relief devices
BS 3457:1973
Specification for materials for water tap and stop valve seat washers
BS 3464:2000
Cast iron wedge and double disk gate valves for general purposes
BS 3506, Publication date:1969-09-30
Specification for unplasticized PVC pipe for industrial uses
BS 3799, Publication date:1974-08-30
Specification for steel pipe fittings, screwed and socket-welding for the petroleum industry
BS 3867:1987
Method of specifying outside diameters and pressure ratings for pipe of thermoplastics materials (inch series)
BS 3958-4, Publication date:1982-11-30
Thermal insulating materials – Bonded preformed man-made mineral fibre pipe sections
BS 3L 63:1996
Specification for tube of aluminum-copper-magnesium-silicon-manganese alloy (solution treated and precipitation treated)
BS 3T 53, Publication date:1980-02-29
Specification for chromium-molybdenum steel tube (700 MPa) (outside diameter not less than 12.5 mm) (weldable)
BS 3T 60, Publication date:1980-02-29
Specification for chromium-molybdenum steel tube (1150 MPa) (maximum thickness 8 mm)
BS 4062-1:1982
Valves for hydraulic fluid power systems – Methods for determining pressure differential/flow characteristics
BS 4062-2:1990
Valves for hydraulic fluid power systems – Methods for determining performance
BS 416-1, Publication date:1990-10-31
Discharge and ventilating pipes and fittings, sand-cast or spun in cast iron – Specification for spigot and socket systems
BS 4300/10, Publication date:1969-12-31
Wrought aluminium and aluminium alloys for general engineering purposes (supplementary series) – 5454 Drawn tube
BS 4346-3, Publication date:1982-08-31
Joints and fittings for use with unplasticized PVC pressure pipes – Specification for solvent cement
BS 437, Publication date:1978-10-31
Specification for cast iron spigot and socket drain pipes and fittings
BS 4460:1969
Steel ball valves for the petroleum industry
BS 4514, Publication date:2001-07-15
Unplasticized PVC soil and ventilating pipes of 82.4 mm minimum mean outside diameter, and fittings and accessories of 82.4 mm and of other sizes – Specification
BS 4622, Publication date:1970-07-29
Specification for grey iron pipes and fittings
BS 4625, Publication date:1970-07-31
Specification for prestressed concrete pressure pipes (including fittings)
BS 4660, Publication date:2000-01-15
Thermoplastics ancillary fittings of nominal sizes 110 and 160 for below ground gravity drainage and sewerage
BS 4728:1971
Method for determination of the resistance to constant internal pressure of thermoplastic pipe
BS 4825-1, Publication date:1992-01-31
Stainless steel tubes and fittings for the food industry and other hygienic applications – Specification for tubes
BS 4825-2, Publication date:1992-01-31
Stainless steel tubes and fittings for the food industry and other hygienic applications – Specification for bends and tees
BS 4825-3, Publication date:1992-01-31
Stainless steel tubes and fittings for the food industry and other hygienic applications – Specification for clamp type couplings
BS 4825-4, Publication date:1992-01-31
Stainless steel tubes and fittings for the food industry and other hygienic applications – Specification for threaded (IDF type) coupling
BS 4825-5, Publication date:1992-01-31
Stainless steel tubes and fittings for the food industry and other hygienic applications – Specification for recessed ring joint type couplings
BS 4870 P3:1990
Arc welding of tube to tube-plate joints, metal
BS 4871-3, Publication date:1985-03-29
Specification for approval testing of welders working to approved welding procedures – Arc welding of tube to tube-plate joints in metallic materials
BS 4962, Publication date:1989-07-31
Specification for plastics pipes and fittings for use as subsoil field drains
BS 4991, Publication date:1974-03-29
Specification for propylene copolymer pressure pipe
BS 4L 54:1996
Specification for tube of 99% aluminum (cold draw: seamless: tested hydraulically) not exceeding 12 mm wall thickness)
BS 4T 45, Publication date:1972-03-31
Specification for carbon-manganese steel tube (700 N/mmUP2) (tube 12.5 mm outside diameter and greater) (weldable)
BS 5041:1987
Fire hydrant systems equipment – Specification for landing valves for wet risers
BS 5114, Publication date:1975-05-30
Specification for performance requirements for joints and compression fittings for use with polyethylene pipes
BS 5146 P1:1984
Steel valves for the petrochemical and allied industries
BS 5154:1991
Specification for copper alloy globe, globe stop and check, check and gate valves
BS 5155:1992
Specification for butterfly valves
BS 5156:1990
Specification for diaphragm valves
BS 5157:1989
Specification for steel gate (parallel slide) valves
BS 5158:1989
Specification for cast iron plug valves
BS 5159:1982
Cast iron and carbon steel ball valves for general purposes
BS 5160:1989
Specification for steel globe valves, globe stop and check valves and lift type check valves
BS 5163:1991
Specification for predominantly key-operated cast iron gate valves for waterworks purposes
BS 5254:1983
Specification for polypropylene waste pipe and fittings (external diameter 34.6 mm, 41.0 mm and 64.1 mm)
BS 5255, Publication date:1989-09-29
Specification for thermoplastics waste pipe and fittings
BS 5351:1990
Steel ball valves for petroleum, petrochemical and allied industries
BS 5352:1990
Steel wedge gate, globe and check valves 50mm and small
BS 5353:1989
Specification for steel plug valves
BS 5391-1, Publication date:1976-10-29
Specification for acrylonitrile-butadiene-styrene (ABS) pressure pipe – Pipe for industrial uses
BS 5392-1, Publication date:1976-10-29
Specification for acrylonitrile-butadiene-styrene (ABS) fittings for use with ABS pressure pipe – Fittings for use with pipe for industrial uses
BS 5417:1976
Testing of general purpose industrial valves
BS 5418:1984
Specification for marking of general purpose industrial valves
BS 5422, Publication date:2001-12-05
Method for specifying thermal insulating materials for pipes, tanks, vessels, ductwork and equipment operating within the temperature range -40 degC to +700 degC
BS 5480, Publication date:1990-06-29
Specification for glass reinforced plastics (GRP) pipes, joints and fittings for use for water supply or sewerage
BS 5481:1983
Specification for unplasticized PVC pipe and fittings for gravity sewer
BS 5556:1986
Specification for general requirements for dimensions and pressure ratings for pipe of thermoplastics materials (metric series )
BS 5608, Publication date:1993-11-15
Specification for preformed rigid polyurethane (PUR) and polyisocyanurate (PIR) foams for thermal insulation of pipework and equipment
BS 5627, Publication date:1984-01-31
Specification for plastics connectors for use with horizontal outlet vitreous china WC pans
BS 567, Publication date:1973-03-14
Specification for asbestos-cement flue pipes and fittings, light quality
BS 5672:1991
Specification for designation of the direction of rotation and of cylinders and valves in cylinder heads, and definition of right-hand and left-hand in-line engines and locations on engines for reciprocating internal combustion engines
BS 5793-4:1987
Industrial-process control valves – Specification for inspection and routine testing
BS 5793-6:1986
Industrial-process control valves – Specification for mounting details for attachment of positioners to control valve actuators
BS 5834-1:1985
Surface boxes, guards and underground chambers for gas and waterworks purposes – Specification for guards, including foundation units
BS 5834-2:1983
Surface boxes, guards and underground chambers for gas and waterworks purposes – Specification for small surface boxes
BS 5834-3:1985
Surface boxes, guards and underground chambers for gas and waterworks purposes – Specification for large surface boxes
BS 5834-4:1989
Surface boxes, guards and underground chambers for gas and waterworks purposes – Specification for preformed chambers
BS 5911-1, Publication date:2002-11-18
Precast concrete pipes, fittings and ancillary products – Specification for unreinforced and reinforced concrete pipes (including jacking pipes) and fittings with flexible joints (complementary to BS EN 1916:2002)
BS 5911-110, Publication date:1992-11-15
Precast concrete pipes, fittings and ancillary products – Specification for ogee pipes and fittings (including perforated)
BS 5911-114, Publication date:1992-11-15
Precast concrete pipes, fittings and ancillary products – Specification for porous pipes
BS 5911-230, Publication date:1994-01-15
Precast concrete pipes, fittings and ancillary products – Specification for road gullies and gully cover slabs
BS 5911-3, Publication date:2002-11-18
Precast concrete pipes, fittings and ancillary products – Specification for unreinforced and reinforced concrete manholes and soakaways (complementary to BS EN 1917:2002)
BS 5911-4, Publication date:2002-11-18
Precast concrete pipes, fittings and ancillary products – Specification for unreinforced and reinforced concrete inspection chambers (complementary to BS EN 1917:2002)
BS 5911-5, Publication date:2004-09-01
Precast concrete pipes, fittings and ancillary products – Specification for prestressed non-pressure pipes and fittings with flexible joints
BS 5955-6, Publication date:1980-11-28
Plastics pipework (thermoplastics materials) – Code of practice for the installation of unplasticized PVC pipework for gravity drains and sewers
BS 5955-8, Publication date:2001-10-22
Plastics pipework (thermoplastics materials) – Specification for the installation of thermoplastic pipes and associated fittings for use in domestic hot and cold services and heating systems in buildings
BS 5970, Publication date:2001-12-21
Code of practice for thermal insulation of pipework and equipment in the temperature range of -100 degC to +870 degC
BS 5995:1980
Methods of test for electrohydraulic servovalves
BS 5T 2, Publication date:1972-10-27
Specification for 4/1 nickel-chromium steel tube (1300 N/mmUP2)
BS 6076, Publication date:1996-11-15
Specification for polymeric film for use as a protective sleeving for buried iron pipes and fittings (for site and factory application)
BS 61, Publication date:1969-12-31
Specification for threads for light gauge copper tubes and fittings
BS 6209, Publication date:1982-05-31
Specification for solvent cement for non-pressure thermoplastics pipe systems
BS 6281-3, Publication date:1982-11-30
Devices without moving parts for the prevention of contamination of water by backflow – Specification for pipe interrupters of nominal size up to and including DN 42
BS 6282-2:1982
Devices with moving parts for the prevention of contamination of water by backflow – Specification for check valves of nominal size up to and including DN 54
BS 6282-3:1982
Devices with moving parts for the prevention of contamination of water by backflow – Specification for in-line anti-vacuum valves of nominal size up to and including DN 42
BS 6282-4:1982
Devices with moving parts for the prevention of contamination of water by backflow – Specification for combined check and anti-vacuum valves of nominal size up to and including DN 42
BS 6283-2:1991
Safety and control devices for use in hot water systems – Specifications for temperature relief valves for pressures from 1 bar to 10 bar
BS 6283-4:1991
Safety and control devices for use in hot water systems – Specification for drop-tight pressure reducing valves of nominal size up to and including DN 50 for supply pressures up to and including 12 bar
BS 6362, Publication date:1990-06-29
Specification for stainless steel tubes suitable for screwing in accordance with BS 21 ‘Pipe threads for tubes and fittings where pressure-tight joints are made on the threads’
BS 6464, Publication date:1984-09-28
Specification for reinforced plastics pipes, fittings and joints for process plants
BS 6494-4:1989
Hydraulic fluid power valve mounting surfaces – Specification for clamping dimensions of four-part, size 03 and 05, modular stack valves and directional control valves
BS 65, Publication date:1991-10-31
Specification for vitrified clay pipes, fittings and ducts, also flexible mechanical joints for use solely with surface water pipes and fittings
BS 6675:1986
Specification for servicing valves (copper alloy) for water services
BS 6683:1985
Guide to installation and use of valves
BS 6697:1986
Methods of test for electrohydraulic proportional control valves
BS 6755-2:1987
Testing of valves – Specification for fire type-testing requirements
BS 6759-1:1995
Safety valves – Part 1. Specification for safety valves for steam and hot water
BS 6759-2:1997
Safety valves – Part 2. Safety valves for compressed air or inert gas
BS 6759-3:1995
Safety valves – Part 3. Specification for safety valves for process fluids
BS 6821:1988
Methods for aerodynamic testing of dampers and valves
BS 7159, Publication date:1989-10-31
Code of practice for design and construction of glass-reinforced plastics (GRP) piping systems for individual plants or sites
BS 7291-1, Publication date:2001-10-30
Thermoplastics pipes and associated fittings for hot and cold water for domestic purposes and heating installations in buildings – General requirements
BS 7291-2, Publication date:2001-10-30
Thermoplastics pipes and associated fittings for hot and cold water for domestic purposes and heating installations in buildings – Specification for polybutylene (PB) pipes and associated fittings
BS 7291-3, Publication date:2001-10-30
Thermoplastics pipes and associated fittings for hot and cold water for domestic purposes and heating installations in buildings – Specification for cross-linked polyethylene (PE-X) pipes and associated fittings
BS 7291-4, Publication date:1990-05-31
Thermoplastics pipes and associated fittings for hot and cold water for domestic purposes and heating installations in buildings – Specification for chlorinated polyvinyl chloride (PVC-C) pipes and associated fittings and solvent cement
BS 7296-1:1990
Cavities for hydraulic fluid power cartridge valves – specification for two-port slip-in valves
BS 7336:1990
Specification for polyethylene fusion fittings with integral heating element(s) for use with polyethylene pipes for the conveyance of gaseous fuels
BS 7350:1990
Specification for double regulating globe valves and flow measurement devices for heating and chilled water systems
BS 7389-1:1990
Pneumatic fluid power valve mounting surfaces – specification for five-port directional control valves (without electrical motor)
BS 7431, Publication date:1991-03-29
Method for assessing solar water heaters – Elastomeric materials for absorbers, connecting pipes and fittings
BS 7435-1, Publication date:1991-07-31
Fibre cement flue pipes, fittings and terminals – Specification for light quality fibre cement flue pipes, fittings and terminals
BS 7435-2, Publication date:1991-07-31
Fibre cement flue pipes, fittings and terminals – Specification for heavy quality fibre cement flue pipes, fittings and terminals
BS 7438:1991
Specification steel and copper alloy waffer check valves, single disk, spring-loaded type
BS 759-1:1984
Valves, gauges and other safety fittings for application to boilers and to piping installations for and in connection with boilers. Specification for valves, mountings and fittings
BS 7605-2:1992
Agricultural irrigation equipment – Part 2: specification for emitting systems
BS 7677, Publication date:1993-07-15
Recommendations for classification of imperfections in pipe joint rings
BS 78-2, Publication date:1965-02-02
Specification for cast iron spigot and socket pipes (vertically cast) and spigot and socket fittings – Fittings
BS 7838, Publication date:1996-08-15
Specification for corrugated stainless steel semi-rigid pipe and associated fittings for low-pressure gas pipework of up to 28 mm
BS 7892, Publication date:2000-10-15
Specification for seal coats on cement mortar lined ductile iron pipes and fittings
BS 8010-2.1, Publication date:1987-02-27
Code of practice for pipelines – Pipelines on land: design, construction and installation – Ductile iron
BS 8010-2.5, Publication date:1989-08-31
Code of practice for pipelines – Pipelines on land: design, construction and installation – Glass reinforced thermosetting plastics
BS 806:1998
Specification for design and construction of ferrous piping installations for and in connection with land boilers
BS 835, Publication date:1973-03-30
Specification for asbestos-cement flue pipes and fittings, heavy quality
BS 864-3, Publication date:1975-05-30
Capillary and compression tube fittings of copper and copper alloy – Compression fittings for polyethylene pipes
BS 949-3, Publication date:1993-03-15
Screwing taps – Specification for pipe thread taps
BS EN 10232, Publication date:1994-05-15
Metallic materials – Tube (in full section) – Bend test
BS EN 10233, Publication date:1994-05-15
Metallic materials – Tube – Flattening test
BS EN 10234, Publication date:1994-05-15
Metallic materials – Tube – Drift expanding test
BS EN 10242, Publication date:1995-09-15
Threaded pipe fittings in malleable cast iron
BS EN 1056, Publication date:1996-09-15
Plastics piping and ducting systems – Plastics pipes and fittings – Method for exposure to direct (natural) weathering
BS EN 1092-2:1997
Flanges and their joints – Circular flanges for pipes, valves, fittings and accessories, PN designated – Cast iron flanges
BS EN 1112:1997
Shower outlets for (PN 10) sanitary tapware
BS EN 1119, Publication date:1996-09-15
Plastics piping systems – Joints for glass-reinforced thermosetting plastics (GRP) pipes and fittings – Test methods for leaktightness and resistance to damage of flexible and reduced-articulation joints
BS EN 1120, Publication date:1996-09-15
Plastics piping systems – Glass-reinforced thermosetting plastics (GRP) pipes and fittings – Determination of the resistance to chemical attack from the inside of a section in a deflected condition
BS EN 12119:1997
Plastics piping systems – Polyethylene (PE) valves – Test method for resistance to thermal cycling
BS EN 1229, Publication date:1997-01-15
Plastics piping systems – Glass-reinforced thermosetting plastics (GRP) pipes and fittings – Test methods to prove the leaktightness of the wall under short-term internal pressure
BS EN 1277, Publication date:2004-04-21
Plastics piping systems – Thermoplastics piping systems for buried non-pressure applications – Test methods for leaktightness of elastomeric sealing ring type joints
BS EN 14141:2003
Valves for natural gas transportation in pipelines – Performance requirements and tests
BS EN 14189:2003
Transportable gas cylinders. Inspection and maintenance of cylinder valves at time of periodic inspection of gas cylinders. Partially replaces BS 341-1:1991
BS EN 1680:1997
Plastics piping systems – Valves for polyethylene (PE) piping systems – Test method for leaktightness under and after bending applied to the operating mechanism
BS EN 1704:1997
Plastics piping systems – Thermoplastics valves – Test method for the integrity of a valve after temperature cycling under bending
BS EN 1705:1997
Plastics piping systems – Thermoplastics valves – Test method for the integrity of a valve after an external blow
BS EN 253:2003
District heating pipes – preinsulated bonded pipe systems for directly buried hot water networks – pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene
BS EN 28233:1992
Thermoplastics valves – Torque – Test method
BS EN 28659:1992
Thermoplastics valves – Fatigue strength – Test method
BS EN 295-1, Publication date:1991-10-31
Vitrified clay pipes and fittings and pipe joints for drains and sewers – Requirements
BS EN 295-2, Publication date:1991-10-31
Vitrified clay pipes and fittings and pipe joints for drains and sewers – Quality control and sampling
BS EN 295-3, Publication date:1991-10-31
Vitrified clay pipes and fittings and pipe joints for drains and sewers – Test methods
BS EN 295-4, Publication date:1995-09-15
Vitrified clay pipes and fittings and pipe joints for drains and sewers – Requirements for special fittings, adaptors and compatible accessories
BS EN 295-5, Publication date:1994-08-15
Vitrified clay pipes and fittings and pipe joints for drains and sewers – Requirements for perforated vitrified clay pipes and fittings
BS EN 295-6, Publication date:1996-04-15
Vitrified clay pipes and fittings and pipe joints for drains and sewers – Requirements for vitrified clay manholes
BS EN 295-7, Publication date:1996-04-15
Vitrified clay pipes and fittings and pipe joints for drains and sewers – Requirements for vitrified clay pipes and joints for pipe jacking
BS EN 448:2003
District heating pipes – preinsulated bonded pipe systems for directly buried hot water networks – fittings assemblies of steel service pipes, polyurethane thermal insulation and outer casing of polyethylene
BS EN 476, Publication date:1998-01-15
General requirements for components used in discharge pipes, drains and sewers for gravity systems
BS EN 488:2003
District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks – Steel valve assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene
BS EN 489, Publication date:2003-02-27
District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks – Joint assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene
BS EN 545, Publication date:2002-07-23
Ductile iron pipes, fittings, accessories and their joints for water pipelines – Requirements and test methods
BS EN 558-1:1996
Industrial values face to face and center to face dimensions of metal valves for use in flanged pipe systems. Part 1 PN designated valves
BS EN 558-2:1996
Industrial valves face to face and center to face dimensions of metal valves for use in flanged piping systems. Part 2 class-designated valves
BS EN 561:2002
Gas welding equipment – Quick-action coupling with shut-off valves for welding, cutting and allied processes
BS EN 588-1, Publication date:1997-04-15
Fibre-cement pipes for sewers and drains – Pipes, joints and fittings for gravity systems
BS EN 598, Publication date:1995-01-15
Ductile iron pipes, fittings, accessories and their joints for sewerage applications – Requirements and test methods
BS EN 60534-1:1989
Industrial-process control valves – Industrial-process control valves – Control valve terminology and general considerations
BS EN 60534-2-1:1999
Industrial-process control valves – Flow capacity – Flow capacity – Sizing equations for fluid flow under installed conditions
BS EN 60534-2-3:1998
Industrial-process control valves – Flow capacity – Test procedures
BS EN 60534-2-5:2003
Industrial-process control valves – Flow capacity – Sizing equations for fluid flow through multistage control valves with interstage recovery
BS EN 60534-3-1:2000
Industrial-process control valves – Dimensions – Face-to-face dimensions for flanged, two-way, globe-type, straight pattern and centre-to-face dimensions for flanged, two-way, globe-type, angle pattern control valves
BS EN 60534-3-2:2001
Industrial-process control valves – Dimensions – Face-to-face dimensions for rotary control valves except butterfly valves
BS EN 60534-3-3:1998
Industrial-process control valves – Dimensions – End-to-end dimensions for buttweld, two-way, globe-type, straight pattern control valves
BS EN 60534-5:2004
Industrial-process control valves – Marking
BS EN 60534-6-1:1998
Industrial-process control valves – Mounting details for attachment of positioners to control valves – Positioner mounting on linear actuators
BS EN 60534-6-2:2001
Industrial-process control valves – Mounting details for attachment of positioners to control valves – Positioner mounting on rotary actuators
BS EN 60534-8-1:2001
Industrial-process control valves – Noise considerations – Laboratory measurement of noise generated by aerodynamic flow through control valves
BS EN 60534-8-2:1991
Industrial-process control valves – Noise considerations – Laboratory measurement of noise generated by hydrodynamic flow through control valves
BS EN 60534-8-3:2000
Industrial-process control valves – Noise considerations – Control valve aerodynamic noise prediction method
BS EN 60534-8-4:1994
Industrial-process control valves – Noise considerations – Prediction of noise generated by hydrodynamic flow
BS EN 60730-2-8:2002
Specification for automatic electrical controls for household and similar use – Particular requirements – Particular requirements for electrically operated water valves, including mechanical requirements
BS EN 639, Publication date:1995-05-15
Common requirements for concrete pressure pipes including joints and fittings
BS EN 640, Publication date:1995-05-15
Reinforced concrete pressure pipes and distributed reinforcement concrete pressure pipes (non-cylinder type), including joints and fittings
BS EN 641, Publication date:1995-05-15
Reinforced concrete pressure pipes, cylinder type, including joints and fittings
BS EN 642, Publication date:1995-06-15
Prestressed concrete pressure pipes, cylinder and non-cylinder, including joints, fittings and specific requirement for prestressing steel for pipes
BS EN 681-1, Publication date:1996-11-15
Elastomeric seals – Material requirements for pipe joint seals used in water and drainage applications – Vulcanized rubber
BS EN 723, Publication date:1996-12-15
Copper and copper alloys – Combustion method for determination of carbon on the inner surface of copper tubes or fittings
BS EN 736-1:1995
Valves – Terminology – Definition of types of valves
BS EN 736-2:1997
Valves – Terminology – Definition of components of valves
BS EN 816:1997
Sanitary tapware – Automatic shut-off valves PN 10
BS EN 911, Publication date:1996-03-15
Plastics piping systems – Elastomeric sealing ring type joints and mechanical joints for thermoplastics pressure piping – Test method for leaktightness under external hydrostatic pressure
BS EN 917:1997
Plastics piping systems – Thermoplastics valves – Test methods for resistance to internal pressure and leaktightness
BS EN 922, Publication date:1995-07-15
Plastics piping and ducting systems – Pipes and fittings of unplasticized poly(vinyl chloride) (PVC-U) – Specimen preparation for determination of the viscosity number and calculation of the k-value
BS EN 969, Publication date:1996-01-15
Specification for ductile iron pipes, fittings, accessories and their joints for gas pipelines – Requirements and test methods
BS EN ISO 11961, Publication date:1997-02-15
Petroleum and natural gas industries – Steel pipes for use as drill pipe – Specification
BS EN ISO 12185, Publication date:1996-09-15
Methods of test for petroleum and its products – Crude petroleum and petroleum products – Determination of density – Oscillating U-tube method
BS EN ISO 5210:1996
Industrial valves – Multi-turn valve actuator attachments
BS EN ISO 8434-1, Publication date:1995-09-15
Metallic tube connections for fluid power and general use – 24 compression fittings
BS EN ISO 8434-4, Publication date:1997-01-15
Metallic tube connections for fluid power and general use – 24 cone connectors with O-ring weld-on nipples
BS EN ISO 8497, Publication date:1997-01-15
Thermal insulation – Determination of steady-state thermal transmission properties of thermal insulation for circular pipes
BS EN ISO 9455-12, Publication date:1994-12-15
Soft soldering fluxes – Test methods – Steel tube corrosion test
BS ISO 10931-1, Publication date:1997-05-15
Plastics piping systems for industrial applications – Poly (vinylidene fluoride) – General
BS ISO 10931-2, Publication date:1997-05-15
Plastics piping systems for industrial applications – Poly (vinylidene fluoride) – Pipes
BS ISO 10931-3, Publication date:1997-05-15
Plastics piping systems for industrial applications – Poly (vinylidene fluoride) – Fittings
BS ISO 4401:1996
Hydraulic fluid power – Four-port directional control valves – Mounting surfaces
BS ISO 6263:1997
Hydraulic fluid power – Compensated flow-control valves – Mounting surfaces
BS ISO 8434-2, Publication date:1995-09-15
Metallic tube connections for fluid power and general use – 37 flared fittings
BS ISO 8434-3, Publication date:1995-09-15
Metallic tube connections for fluid power and general use – O-ring face seal fittings
BS L 105:1996
Specification for tube of aluminum-copper-magnesium-silicon-manganese alloy (Solution treated and aged at room temperature) (not exceeding 10 mm wall thickness)
BS L 114, Publication date:1971-09-30
Specification for tube of aluminium-magnesium-silicon-manganese alloy (solution treated and precipitation treated) (not exceeding 10 mm wall thickness) (suitable for welding) (Mg 0.8, Si 1, Mn 0.7)
BS L 117, Publication date:1975-05-30
Specification for tube of aluminium-magnesium-silicon-copper-chromium alloy (solution treated and artificially aged: not tested hydraulically) (not exceeding 10 mm thickness) (Mg 1.0, Si 0.6, Cu 0.28, Cr 0.2)
BS L 118, Publication date:1975-05-30
Specification for tube of aluminium-magnesium-silicon-copper-chromium alloy (solution treated and artificially aged: tested hydraulically) (not exceeding 10 mm thickness) (Mg 1.0, Si 0.6, Cu 0.28, Cr 0.2)
BS T 64, Publication date:1972-03-31
Specification for carbon-manganese steel tube (550 N/mmUP2) (tube less than 12.5 mm outside diameter) (weldable)
BS T 67, Publication date:1972-10-27
Specification for 18/10 chromium-nickel corrosion-resisting steel tube (titanium stabilized: 550 N/mmUP2) (weldable)
BS T 69, Publication date:1972-10-27
Specification for cold drawn 18/10 chromium-nickel corrosion-resisting steel tube (titanium stabilized: 800 N/mmUP2) (weldable)
BS T 72-T 73, Publication date:1977-05-31
Specifications for 18/10 chromium-nickel corrosion-resisting steel tube for hydraulic purposes (niobium/titanium stabilized: 550 MPa)
BS T 74, Publication date:1972-10-27
Specification for low carbon 18/10 chromium-nickel corrosion-resisting steel tube (500 N/mmUP2)
BS T 75, Publication date:1972-10-27
Specification for low carbon 17/12 chromium-nickel-molybdenum corrosion-resisting steel tube (500 N/mmUP2)
BS T 76, Publication date:1978-11-30
Specification for chromium-molybdenum steel tube (770 MPa) (weldable)
BS T 77, Publication date:1980-02-29
Specification for chromium-molybdenum steel tube (900 MPa) (weldable)
BS1655:1976
Flanged automatic control valves for the process control industry (face to face dimensions)
BS1952:2000
Copper alloy valves for general purposes
BS1953:2000
Copper alloy check valves for general purposes
BS1963:1990
Specification for pressure operated relay valves for domestic, commercial and catering gas appliances
BS2060:2000
Copper alloy screw down stop valves for general purposes
BS2080:1995
Specification for face to face, center to face, end to end and center to end dimensions of valves
BS2995:1966
Cast and forged steel wedge gate, globe, check and plug valve, screwed and socket welding, sizes 2 in and smaller, for the petroleum industry
BS3808:1964
Cast and forged steel flanged, screwed and socket welding wedge gate valves (compact design), sizes 2 in and smaller, for the petroleum industry
BS3948:1965
Cast iron parallel slide valves for general purposes
BS3952:1965
Cast iron butterfly valves for general purposes
BS3961:1965
Cast iron screw down stop valves and stop and check valves for general purposes
BS4090:1966
Cast iron check valves for general purposes
BS4133:1967
Flanged steel parallel slide valves for general purposes
BS4312:1968
Flanged steel screw down stop valves and check valves for general purposes

by PipeAdmin
Tags: acronyms, electrical, Electrician

Feb 8, 2018

Acronyms – Plumbing

abbrev	define
ABS	Acrylonitrile-Butadiene-Styrene. Rigid black plastic pipe used for drain / waste / vent lines.
A Valve	A manual gas shut-off valve.
AC	Alternating Current. Electrical supply in which the polarity of the wire reverses rapidly.
AGA	American Gas Association
AIA	American Institute of Architects
ANSI	American National Standards Act
API	American Petroleum Institute
ASA	American Supply Association
ASME	American Society of Mechanical Engineers
ASHRAE	American Society of Heating, Refrigeration, Air Conditioning Engineers.
ASSE	American Society of Sanitation Engineers
ASTM	American Society for Testing Materials
AWWA	American Water Works Association
Absolute Pressure	Atmospheric pressure added to gauge pressure.
Absorption Field	A leeching or seeping field engineered to receive septic tank effluent.
Acceptance Factor	Bladder tank draw-down expressed as a percentage.
Access Panel	A covered opening that allows access to service a plumbing system.
Acrylic	Thermo-plastic used on surface of shower walls / bathtubs / whirlpools.
Adaptor	A fitting that joins two different types of pipe together, or joins threaded to non-threaded pipe ends.
Adjusting Link	An adjustable strap / bar that forms a connection between the lift rod of a faucet and the ball lever assembly of the drain.
Aeration	The turbulent mixing of water and air to dissipate pollutants into the air
Aerator	A device attached to the end of a faucet that mixes air into flowing water..
Air Admittance Valve	A device that replaces a traditional vent to allow air to enter the pipe and equalize pressure, preserving the seal of water in the fixture trap.
Air Chamber	A vertical, air-filled pipe or spring coil, set above the water line to absorb pressure when water is turned off at the faucet.
Air Check	A device that allows water, but not air, to pass through it. An air check is a typical component in treatment systems using a regenerant eductor.
Air Elimination Vent	A device which automatically eliminates trapped air in the ”closed-loop” hydronic system
Air Gap	A device mounted at the back of a kitchen sink, connecting to the drain line between a dishwasher and disposer to allow the dishwasher to discharge freely into the disposer while preventing contaminated water from siphoning back into the dishwasher.
Air-Gas Ratio	Ratio of combustion air supply flow rate to the fuel gas supply flow rate.
Air Lock	Blockage liquid flow of liquid (i.e. on suction side of pump) caused by an air bubble in the line.
Air Volume Control	Maintains the air charge in a standard water storage tank. Pre-charged tanks do not require an air volume control.
Alarm Check Valve	A check valve located in the riser of a wet pipe fire sprinkler system that sounds an alarm when water begins to pass through it.
Anaerobic	The ability to live and grow without air or free oxygen (i.e. some forms of bacteria that break down waste in a septic system.)
Angle Discharge Tube	A discharge tube that changes direction of the flow by 90°.
Angle Seat Wrench	A valve seat wrench with a handle that includes a 90° bend.
Angle Stop	A shutoff valve between water pipes and a faucet. The inlet connects to the water-supply pipe in a wall, the outlet angles up 90° to the faucet
Anode Rod	A sacrificial rod installed in a water heater. It is composed of one or more metals that protect the tank from corrosion and extend tank life.
Anti-Clog Suction	Whirlpool water recirculating system mechanism that prevents clogging but doesn’t restrict water flow.
Anti-Scald Valve	A shower mixing valve that automatically maintains balance between incoming hot and cold water supplies by immediately regulating fluctuations in pressure. As a result, temperature remains constant, though the outlet pressure may drop. Also called pressure-balanced valve.
Anti-Siphon	Preventive device for back-flow of liquid such as on sprinkler systems to prevent water from trickling back into the feed supply.
API Specifications	American Petroleum Institute specifications
Apron	The apron (or skirting) is a decorative portion of a bathtub covering the rough-in area from the floor to the top rim of the tub.
Aquastat	A thermostat that is submerged in water. It is used to control operation of a specific device.
Aspiration	The process of mixing air with discharging water to enhance the hydro-massage effect of a whirlpool.
Auto Pilot	A gas pilot device that automatically shuts off gas supply to the appliance burner if the pilot flame is extinguished.
BC	Brushed Chrome finish used on faucets.
BHP	Brake Horse Power. The actual amount of horsepower consumed by a pump as measured on a dynamometer.
BN	Brushed Nickel finish used on faucets.
BTU	British Thermal Unit – A unit of heat energy required to raise the temperature of 1 lb. of water 1 degree Fahrenheit.
Backfire	Flashback of flame through the burner venturi causing the gas to burn at the orifice.
Back Flow	The act of water traveling from one system back into any part of the main distribution system (usually by siphoning. )
Back Flow Preventer	A device to prevent backflow i.e. into a potable water supply. Usually required for sprinkler systems, handheld showers, pullout faucet spouts, kitchen sprayers, etc.
Back Pressure	Pressure that resists the flow of fluid in a piping system.
Back Siphonage	The negative pressure that causes backflow.
Backjet	Whirlpool jets located on the fixture wall behind a reclining bather.
Backjet Pulse Canister	A water-controlling device responsible for backjet pulsing action.
Back Vent	Plumbing fixture’s separate vent in a building drainage system.
Back Wash	The process of cleaning a filter by reversing the flow of water through it. Accumulated sediments are sent to waste.
Backup	Overflow of a plumbing fixture due to drain stoppage
Backwater Valve	Sewer line valve that prevents sewage from flowing back into the house
Baffle	An object placed in an appliance to change the direction of, or retard the flow of air, air-gas mixtures, or flue gases
Balancing Valve	A water heater valve that controls water flow and balances heat distribution to different locations.
Ball Check Valve	A valve that uses a ball to seal against a seat to stop flow in one direction.
Ball Joint	Spherical assembly allowing pivot rotations for showerheads.
Ball Passage	Refers to the size of the ball that can pass through the trap-way of a toilet. Also relates to trap-way size. Usually the trap size will be 1/8” larger than the maximum size ball that can pass through it
Ball Valve	A valve that uses a ball to seal against the seat.
Ballcock	Controls the flow of water from the water supply line into a gravity-operated toilet tank. It is controlled by a float mechanism in the tank water.
Balloon Bag	Device that attaches to a garden hose. Used to loosen drain blockage.
Barlow’s Formula	An equation that shows the relationship of internal pressure to allowable stress, nominal thickness and diameter.
Barrier-Free	Relating to handicap access, e.g. a shower enclosure system having minimal or no bottom track and openings that are wheelchair-accessible.
Basket Strainer	Basket-shaped strainer with holes and a slot that fits the sink drain to allow water to run out but to catch food or other solids before they can enter the sewage system.
Beehive Strainer	A strainer inserted into a urinal to prevent foreign matter from falling into the drain.
Bernoulli’s Law	The principle that a stream of liquid or gas exerts less sideways pressure while in motion than while at rest. As a result, fluids seem to be drawn into the stream, but are really pushed in by higher outside pressure.
Bidet	A personal hygiene plumbing fixture similar in appearance to a toilet bowl used for washing genitals and posterior areas of the body. It is mounted on the floor next to a toilet and consists of a washing basin, a hot and cold faucet, and sprayer.
Biochemical Oxygen Demand	The amount of oxygen consumed in the oxidation of organic matter by biological action under standard test conditions; often used as a measure of the strength of sewage and waste water.
Bisque	The rough, unpolished finish found in unglazed areas of vitreous china fixtures, such as inside the tank or the bottom of the bowl.
Blackwater	Wastewater from toilets or latrines and sinks used for food preparation or disposal, or for the disposal of chemicals.
Bleed	To drain a pipe of excess air by opening a valve at the end of the pipe
Blind Plug	Plug used on No Hub pipe.
Block Sensor Mode	For touch-less faucets, a system mode that occurs when the faucet continually senses an object, causing the faucet to stop functioning normally. The faucet will appear to be ”OFF”, and will self-actuate every two hours to alert you to its condition.
Blowbag	Also called a ”blowfish” it is a drain-cleaning device consisting of a rubber bladder with a hose fitting one one end and a nozzle on the other. The device attaches to a water hose and is inserted into a clogged drainpipe. As water is introduced, it expands to grip the pipe, and releases pulsating bursts of water through the nozzle, forcing water through the pipe to clear the obstruction.
Blowdown	Partial venting or draining, under pressure, of the water side of a boiler to reduce or remove unwanted contaminants. Also the pressure drop after releasing a pressure-relief valve.
Bodyspray	Shower component used in conjunction with a showerhead to deliver flow of water. Commonly used in multiples to create a custom shower space.
Boiler	A sealed tank where water is turned to steam for heating or power.
Boiler Feed	A check valve controlling inlet water flow to a boiler.
Bonnet	The top portion of a compression valve assembly that holds the valve in place as it is tightened against the valve seat at the other end.
Box	The internal (female) threaded end of pipe.
Box Flange	Flange containing internal (female) threaded pipe fitting
Brackish Water	Water containing bacteria between 1.000 and 15,000 ppm of dissolved solids
Braided Tubing	A flexible pressure tubing of synthetic material encased in braided threads of steel, usually chrome plated or stainless. The braiding protects the tube from damage due to abrasion or crimping. Often used in water supply lines.
Branch	Any part of a drain system other than the main, riser, or stack.
Branch Vent	A vent connecting one or more individual vents with a vent stack
Brine	A strong solution of sodium chloride (salt) used in the regeneration of ion exchange water softeners.
Building Drain	The lowest point in a drainage system where the interior drainage pipes meet and are conveyed it to the sewer.
Burst Pressure	The internal pressure that will cause piece of tubing to fail
Bushing	A pipe fitting used to join two pipes of different sizes. A bushing is threaded inside and out. Also a cylindrical part used as a lining or guide
Butterfly Valve	A valve made of a square, rectangular, or round disk attached to a shaft inside a body of the same shape. Rotating the shaft 90 degrees opens or closes the valve.
Buttress (Tile Rise)	The raised portion of a shower curb that is on more than one level.
Bypass	A type of shower door system that consists of two or more panels running in parallel tracks.
CBD	Certified Bathroom Designer
CC	Copper to Copper soldered.
CFM	Cubic Feet per Minute
CI	Cast Iron
CO	CleanOut
CP	Polished Chrome finish used on faucets
CPe	Solvent Chlorinated Polyethylene. A melting agent to form seams in shower pan liners
CPvC	Chlorinated Polyvinyl Chloride. Rigid plastic pipe used in water supply systems, where code permits. Withstands high temperatures. Available in straight or in rolls
CSST	Corrugated Stainless Steel Tubing. Also known as ”TracPipe” and has a polyethylene jacket.
CTS	Copper Tube Size. Refers to outside diameter and is used to size certain fittings and hangers
CW	Continuous Weld. A method of producing a small diameter pipe.
Calcium Carbonate	A white accumulation that forms in water lines, water heaters and boilers in hard water areas usually referred to as ”scale.”
Calcium Hypochlorite Extract	The matter adsorbed from a stream of water by activated carbon, and then extracted from the activated carbon with chloroform, using a specific standardized procedure; a measure of the organic matter in a water.
Calcium / Magnesium	Two of the principal elements that, when dissolved, make water hard. Their presence contributes to the formation of scale and insoluble soap curds.
Capacity	1. Pumps: The flow rate in gallons per minute or liters per minute. \n2. Water softeners / conditioners: Quantity of undesirable matter that can be removed by a water conditioner under standard test conditions. For ion exchange water softeners, this is expressed in grains of hardness removal between regeneration’s and is related to a pound of salt used.\n3. Water filters: For filters, capacity may be expressed in the length of time or total gallons delivered between servicing.\n4. Water heaters: The size in gallons of water of the storage tank (e.g. 40 gal, 75 gal, etc)
Carbon Dioxide (CO2)	A gas present in the atmosphere, formed by the decay of organic matter; the gas in carbonated beverages; dissolved in water it forms carbonic acid.
Carbonate Alkalinity	Alkalinity due to the presence of the carbonate ion (CO32-).
Carbonate Hardness	Water hardness due to the presence of calcium and magnesium carbonates and bicarbonates in water; the smaller of the total hardness and the total alkalinity.
Carbonizing	In a pump, where a reduction of hydrocarbons results in the formation of carbon residue that will interfere with the movement of a mechanical seal. Often called coking.
Casing	A tubular structure intended to be watertight installed in the excavated or drilled hole to maintain the well opening and to prevent ground water from entering the well.
Cast Iron	Heavy metal made of casting on molds to make fixtures such as sinks, tubs and lavatories, covered with a porcelain enamel coating. Casting is made of a series of alloys primarily of iron, carbon, and silicon.
Cast Iron No Hub Pipe	Also known as Soil Pipe, No Hub pipe is used in certain locales and for commercial buildings for soil stacks. It cannot be soldered, threaded, or welded, and can only by connected by steel banded rubber sleeved adapters.
Catch Basin	Large underground container, with a grate on the top, for collection of storm water run-off. It catches or collects dirt and other debris and prevents them from polluting streams and lakes..
Cavitation	The vacuum created when the discharge capacity of the pump exceeds the replacement in the suction line. This causes bubbling and vibrations that can damage the pump if they occur over an extended period.
Celcon Nut	Connectors used to hand-tighten faucets to lavatory from underside of lavatory
Centerset	Style of bathroom faucet having combined spout and handles, with handles 4 inches apart, center-to-center. Also a single-handle faucet installed on 4 inches center-to-center faucet holes.
Centrifugal Pump	A pump that moves water by centrifugal force developed by rapid rotation of an impeller.. As the rotating impeller whirls the water around, centrifugal force builds up pressure forcing the water through the discharge outlet.
Chain Wrench	An adjustable wrench in which a chain is used for gripping. Commonly used on large pipes.
Chamfer	Beveled end, usually done on pipe prior to threading
Check Valve	A type of backflow preventer installed in a pipe run that allows water to flow in only one direction.
Circuit Vent	Plumbing drainage system vertical vent which is run from the last two traps on a horizontal drain line to the main vent stack of a building drainage system.
Cistern	Rainwater storage tank, often underground.
Cleanout Plug	A plug in a trap or drain pipe that provides access for the purpose of clearing an obstruction.
Close Coupled	A toilet with a separate tank and bowl, secured to each other, and with a separate tank cover. Also known as a two-piece toilet.
Close Nipple	Short lengths of pipe that are threaded on both ends. The threads that are so close together they almost join in the center.
Closed System	A system where the incoming cold water supply has a device that will not allow water to expand when heated. (i.e. check valve, backflow preventer, pressure reducing valve, etc.)
Closet Auger	A flexible rod with a curved end used to access the toilet’s built-in trap and remove clogs.
Closet Bend	A curved fitting mounted immediately below the toilet that connects the closet flange to the toilet drain
Closet Flange	An anchoring ring that attaches to the closet bend and secured to the floor. The heads of closet bolts, used to secure the toilet in place, insert into slots in the closet flange.
Closet Tube	A water supply tube used for toilets.
Coagulant	A material, such as alum, which will form a gelatinous precipitate in water, and cause the agglomeration of finely divided particles into larger particles which can then be removed by settling and/or filtration.
Coagulant Aid	A material which is not a coagulant, but which improves the effectiveness of a coagulant, often by forming larger or heavier particles, speeding the reactions, or permitting reduced coagulant dosage.
Coagulation	The process in which very small, finely divided solid particles, often colloidal in nature, are agglomerated (lumped) into larger particles.
Cock	A faucet or valve for regulating the flow of water.
Cockhole	Cover A round cover-plate or disk installed on a sink to cover an unused faucet hole.
Coil Spring Tube Bender	A flexible heavy-wire coil, which, when slipped over copper tubing, allows it to be bent without crimping.
Coking	In a pump, where a reduction of hydrocarbons results in the formation of carbon residue that will interfere with the movement of a mechanical seal. Also referred to as ”Carbonizing”.
Cold Drawn	Pipe or tubing that’s pulled through a die to reduce diameter and wall Produces closer tolerances and higher strength Cold Vapor Method to test water for the presence of mercury.
Coliform	Bacteria Non-pathogenic microorganisms used in testing water to indicate the presence of pathogenic bacteria
Collar	A galvanized sheet metal restricting device used in conjunction with plastic pipe. Its function is to direct and control the expansion action of the firestopping material
Colloid	Very finely divided solid particles that remain suspended in a solution; the removal of colloidal particles usually requires coagulation.
Combined Sewer	A sewer system that carries both sanitary waste and storm water runoff.
Combustion Chamber	The location where combustion takes place.
Combustion Gases	Gases released when a gaseous, liquid, or solid fuel reacts at an elevated level that needs to be vented with gas or oil-fired water heaters.
Commode	Toilet.
Common Vent	Building drain system vertical vent which connects two or more fixture branches on the same level.
Compensated Hardness	A calculated value based on the total hardness, the magnesium to calcium ratio, and the sodium concentration of a water. It is used to correct for the reductions in hardness removal capacity caused by these factors in cation exchange water.
Composite	Composite sinks made from high-tech, high-strength, color- impregnated that resists shipping and scratching.
Composting Toilet	A self-contained toilet that use the process of aerobic decomposition (composting) to break down feces into humus and odorless gases
Compression Fitting	A kind of tubing or pipe connection where a nut, and then a sleeve or ferrule is placed over a copper or plastic tube and is compressed tightly around the tube as the nut is tightened, forming a positive grip and seal without soldering. Also a flexible connector that has a nut and gasket designed to attach directly to an SAE standard compression thread, without the use of a sleeve or ferrule.
Compression Valve	A type of valve that is often used for water faucets. It is opened or closed by raising or lowering a horizontal disk by a threaded stem.
Concealed Arm Carrier	One of a variety of common mechanisms to securely mount a wall-mount lavatory. Unlike a hanger which only supports the lavatory where it meets the wall, the carrier has long arms onto which the lavatory slides.
Condensation	Water vapor that separates from products of combustion due to a reduction in heating surface temperatures to below the dew point of surrounding air. Water formed when water vapor formed in gas combustion loses heat before it passed out of the venting system.
Conductance	In water conditioning, the readiness of water to carry electricity. The unit of measure for conductance is the mho (reciprocal ohm); it is used to approximate the dissolved solids content of water.
Conductivity	The quality or power to carry electrical current; in water, the conductivity is related to the concentration of ions capable of carrying electrical current.
Conduit	A tube that houses electrical wiring.
Conduit Clamp	A screw-down, U-shaped spring clamp formed out of a band of metal used to hold conduit pipe.
Console Lav	A table-like fixture with an integral lavatory. The back is fixed to a wall and the front is supported by brackets or legs.
Console Table	Same as console lav.
Consumptive Water Use	Total amount of water used by vegetation, man’s activities, and evaporation of surface water
Continuous Hinge Door	A shower door that has a full-length continuous metal hinge on the side of the door.
Conventional Vent	Atmospheric venting that utilizes the natural convective rise of hot flue gases through the system to release the products of combustion.
Corporation Stop	The stop connected to the water main, usually made of brass and can be connected to the main with a special tool without shutting off the municipal supply.
Corrosion	The disintegration of a metal by electrochemical means.
Corrosive Water	A water condition of low pH (acid condition) that can corrode metal pipes, pool fixtures and pumps. (Unbalanced water)
Cowl	A short fitting used to join two pieces of pipe.
Crocus Cloth	Finer than sandpaper grit on a cloth backing
Cross-Connection	Any connection or situation that may allow wastewater to enter the supply system.
Crow’s Foot	A PVC tee with twin outlets at right angles off the main.
Crown-vented Trap	An air admittance valve attached to a drainpipe, protected by a check valve, designed to equalize pressure in the drain line and to protect the trap seal.
Crown Weir	The interior projection in the outlet side of a P-trap to aid in maintaining the water seal in the trap.
Cubic Foot of Gas	The amount of gas that will occupy one cubic foot at a temperature of 60 degrees F, and under a pressure equivalent to that of 30 inches of mercury.
Culvert	A pipe-like construction of concrete that passes under a road to allow drainage.
Curb	A raised edge or border of a shower, usually made of tile, marble, or fiberglass.
Curb Cock Shutoff	A valve normally used with water meters set between the meter and the building.
Curtain Drain	A ditch sometimes filled with gravel or drainage tile which diverts storm water away from a structure
Cut Lengths	Pipe cut to a specific length as ordered
DI	Abbreviation for ”deionization”
DWV	Drainage, waste, and vent systems, which remove wastewater. Not for drinking water.
Dam	The barrier built into a trapway of a toilet that controls the water level in the toilet bowl.
Deck Mount	Describes a faucet that is mounted on the deck of the bathtub enclosure, rather than on the rim of the bathtub or on the wall. Also referred to as a Roman spout faucet. Also known as a sunken tub, the deck-mount tub is usually mounted on a platform and has no apron or decorative side.
Deep Well	A well more than 25 ft. deep
Degree Rise	The difference between the starting water temperature and the ending temperature after heating is complete.
Deionization	The process of reducing water to a non-mineral state by passing it over a bed of resins
Deionized Water	Water free of inorganic materials.
Desanco Fitting	A type of compression adapter that connects tubular brass fittings to pvc pipe.
Dew Point	Temperature at which water vapor condenses to a liquid.
Dial Plate	Trim piece found behind a single-control wall-mount faucet handle. Also known as a face plate.
Diaphragm	Flexible membrane in a valve that deflects down onto a rigid area of the valve body to regulate water flow from the supply lines. This eliminates the possibility of debris build-up within the valve.
Die	Cutting device used to thread pipe. A set of these attach to die-heads, and mounted on a threading device.
Diffuser	Device for reducing the velocity and increasing the static pressure of a fluid passing through a system
Dilution Air	Air that enters a draft hood or draft regulator and mixes with the flue gasses.
Dip Tube	Tube inside the water heater that sends cold water to the bottom of the tank.
Direct Tap	Clamping device that allows a branch line to be drilled and tapped off a main line.
Direct Vent	A system that pulls outside air for combustion and vents combustion gases directly outside without using a chimney.
Directional Jet	Whirlpool air discharge unit with pivot allowing discharge path to be adjusted by the user. Directional Tee Tee fitting that allows direct flow in one direction by use of an internal baffle.
Discharge Head	Difference in elevation between the liquid level of the discharge tank and the centerline of the pump. Also includes any additional pressure head that may be present at the discharge tank fluid surface.
Discharge Tube	Outlet tube that connects a disposer or sump pump to the drain line.
Disposal Field	A series of trenches conveying the effluent from the septic tank laid in such a manner that the flow will be distributed with reasonable uniformity into natural soil.
Dishwasher Tailpiece	A flanged adapter connecting a basket strainer to the drainpipe with a dishwasher inlet.
Diverter	A valves that directs fluid to various outlets. They are used in showers, tubs, bidets, and sinks.
Dope	Pasty lubricant used on seal pipe threads prior to making a threaded pipe connection.
Double Extra Strong	Standard pipe weight designation (XXS). Sometimes described as XXH (double extra heavy).
Double Horizontal Tee	A PVC tee with twin outlets of a smaller diameter than the inlet.
Double Threshold	A shower base used in a corner application where one threshold is used as an entrance and the other has a glass wall.
Double Suction Pump	A pump where the rotor is suspended between two bearings with the fluid entering on either side of the impeller. Used at higher capacities.
Double Wye Fixture	A fitting that has branches coming in at an angle from each side of the main to join the main run.
Down Head Boring Gimlet	A flexible cutting tip for an auger cable.
Draft Diverter	A device fitted in the flue way of a gas appliance to prevent updraft, downdraft, or the secondary flue blockage from obstructing the escape of combustion gases.
Drain	Any pipe that carries wastewater or water-borne waste.
Drain Hub	Floor drain used with hubbed soil pipe. The bell (hub) section is counter-sunk vertically in the floor and covered by a flush-mounted grill.
Drain Seal Gasket	Gasket used to seal a drain to a sink to prevent leaks.
Drain Valve	Device designed to allow drainage of stored contents from a water heater.
Drainage Tile	Pipe-shaped clay tiles installed in below-grade trenches for gravity-rated drainage. PVC pipe is now commonly used for this purpose.
Drawdown	The distance the water level drops below the standing water level while the pump is operating.
Drip Channel	A metal channel that is designed to prevent water running down a shower door from dripping onto the floor when the door is opened.
Drip Leg	A stub end pipe placed at a low point in the gas piping to collect condensate and permit its removal.
Drum Trap	An obsolete, non-vented drain lead or cast iron canister trap formerly used in sewer lines.
Dual Element Heater	An electric water heater with an upper and lower element for heating water.
Duostrainer	Sink drain fitting consisting of a strainer body attached to the drain opening and a removable basket. Also called a strainer.
Duo Valve	A twin valve (hot & cold) with a single on/off lever used for washing machine boxes
Duplex Basin	An ejector pump container, usually 30” x 36” or 36” x 36” large enough for two pumps, used in multi-family buildings
Duraflow	A process patented by Ace Duraflow Company to rejuvenate old corroded plumbing by cleaning and lining with an Epoxy coating.
Dynamic Pressure	The pressure when the water is flowing.
E. Coli	The common abbreviation of Escherichia Coli. One of the members of the coliform groups of bacteria indicating fecal contamination.
ECO	Energy Cut Off. A safety device designed to shut power off to the water heater and prevent high temperature.
EF Energy Factor	A measure of the overall efficiency rating of the water heater based on the model’s recovery, efficiency, stand-by loss and energy input.
EMT	Electrical Metal Tubing. A thin wall galvanized steel pipe used to carry electrical or other types of conductors.
ERW	Electric Resistance Weld. Most common form of manufacture for pipes 2 3/8” to 22” in diameter.
Earthquake Strap	A metal strap used to secure a water heater to the house frame or foundation.
Eccentric Shank	A shank or the fitting with a shank in which the centerline is offset to allow minor compensation for supply lines that would be difficult to precisely position.
Eductor	A device utilizing a nozzle and throat, installed in a stream of water to create a partial vacuum to draw air or liquid into the stream; commonly used to draw regeneration chemicals into an ion exchange water treatment system, such a softener or deionizer.
Efficiency	A product’s ability to utilize input energy, expressed as a percentage.
Effluent	Septic system liquid waste
Ejector	A mechanical device for pumping sewage from below the sewer line.
Elbow	A fitting with two openings that changes the direction of the line. Also known as an ell. It comes in various angles from 22 degrees to 90 degrees; often referred to by their angles (i.e. 45, 90)
Electric Resistance Weld Pipe (ERW)	Cold finished pipe made by a series of operations in which the flat rolled material is cold shaped into tubular form and welded at the seam. The heat for the weld is generated at the seam by the resistance to the flow of electric current applied through electrical contacts or an induction coil.
Electrodialysys	A process which uses an electrical current and an arrangement of permeable membranes to separate soluble minerals from water. It is often used to desalinate salt or brackish water .
Electrolysis	A process involving chemical change caused by the passage of an electric current through a liquid.
Electrolyte	A nonmetallic substance that carries an electric current, or a substance which, when dissolved in water, separates into ions which can carry an electric current.
Element	Heating unit in an electric water heater
Elevation	The vertical distance between the level where fluid enters a pipe and the level where it leaves. It must be added to the Total Discharge Head if the inlet is lower than the outlet and subtracted if the inlet is higher.
Elongated	The shape of a some toilet bowls, where the bowl is about 2 inches longer than the standard round front bowl, usually 14 inches wide by 18 inches long.
Enamel	An opaque vitreous composition applied by fusion to the surface of metal fixtures such as cast iron and pressed steel tubs, lavs, and sinks. Enameled steel is less durable than enameled cast-iron.
Enclosure	Panels of glass or other material used to form shower or tub stalls.
End Body	A faucet valve body configuration in which both the inlet and outlet are at the end of the valve body.
End Drain	The side of a tub where the drain is found. When facing a tub, if the drain is on the right, this is a Right-Hand tub (RH). If on the left, it is a Left Hand tub (LH). On whirlpools, the pump is located opposite the drain.
Endpoint	(1) The point at which a process is stopped because a predetermined condition is met;\n(2) in an ion exchange water softener service run, this is where the hardness of the softener effluent increases to a predefined concentration, often 1.0 grain per gallon;\n(3) in a filter service this may be where the pressure drop across the filter reaches a predetermined value.
Energy Guide Label	The label required by the FTC on water heaters that show 1) an estimated annual cost of operation and 2) how that unit’s efficiency compares to all other comparable models.
Escutcheon	A decorative metal flange or trim shield beneath a faucet handle that covers the faucet stem and the hole in the fixture or wall.
Expansion Tank	A tank designed to absorb excess pressure due to thermal expansion. (e.g. closed system)
Expansion Valve	Thermostatically controlled valve that controls liquid refrigerant.
Extinction Pop	A flashback occurring when a burner is turned off.
Extra Strong	A standard pipe weight designation (XS). Sometimes called XH (Extra Heavy)
Extrusion	Refers to the result of forcing molten metal or plastic through a die or mold to form a specific shape. Commonly refers to shower door components such as jambs and headers that were created by extrusion.
Eye of the Impeller	The center of the impeller, where the fluid enters.
F Rating	A rating of effectiveness of firestop material, measuring its resistance to flames and water.
FHT	Female Hose Thread. (e.g. end of garden garden hose)
FIP	Female Iron Pipe connection. Standard internal threads on pipe fittings.
FMA	Free Mineral Acidity.
FMPX	Female pipe swivel connection
FNPT	This refers to the female pipe thread, in which the threads are on the inner side of the connection fitting
FVI	Flammable Vapor Ignition
Facultative Bacteria	Bacteria that can live under aerobic or anaerobic conditions
Fall / Flow	The proper slope or pitch of a pipe for adequate drainage.
Fascia	A decorative apron or front face. A wooden enclosure holding the main pump assembly for whirlpool and master baths.
Faucet Threads	Special thread size for fittings that connect to faucets. A cone seal or gasket is usually included because straight threads will not have a complete seal without a gasket.
Fecal Coliform	The portion of the coliform bacteria group which is present in the intestinal tracts and feces of warm-blooded animals. A common pollutant in water
Feed Pump	A pump that supplies water to a boiler.
Feed Water	Water introduced into a boiler during operation. It includes make-up and return condensate.
Female Fitting	A fitting that receives a pipe or fitting. A fitting into which another fitting is inserted.
Female Threads	Faucet threads that are in place on the inside of a fitting.
Ferrous	Material containing or derived from iron.
Ferrule	Metal cover piece for the lavatory overflow opening.
Filter Element	A device within a filter tank designed to trap suspended solids as water flows through it.
Filtrate	Liquid that has been passed through a filter
Filtration Rate	The rate at which the water is traveling through the filter, measured as GPM (gallons per minute) per sq. ft.
Finish Plumbing	Installation of plumbing fixtures to make the system usable.
Finished Water	Water that has completed a purification or treatment process.
Fire Hose Closet	Usually a compartment built into an interior wall, covered by a glass door, holding a coiled fire hose connected to a water line, ready for immediate use in case of fire.
Fire Stand Pipe	A main water line that feels water sprinkling system or fire hose connections. This is separate from the lines feeding restrooms or other fixtures.
Firestop	Materials that fill the opening around penetrating items such as cables, cable trays, conduits, ducts, and pipes and their means of support through the wall or floor to prevent spread of fire.
First Draw	Water that has been sitting in pipes or plumbing fixtures overnight and is first drawn when taps are opened in the morning. For instance, where lead is present in plumbing, this water would have the highest levels of lead contamination.
First Hour Delivery	Rating based on the combination of the usable stored volume of hot water in a tank plus the recovery capacity for the first hour of operations.
Fitting	Any pipe part used to join together two sections of pipe, such as elbows, couplings, bushings, bends, wyes, etc.
Fixed Cone Valve	A cylinder gate mounted with the axis horizontal. Also known as Howell Bunger valve.
Fixture	A device that provides a supply of water or its disposal, e.g. sinks, tubs, toilets.
Fixture Unit	An arbitrary unit assigned to different types of plumbing fixtures, and used to estimate flow rate requirements and drain capacity requirements.
Flame Stability	Flames on a burner tend to stabilize at a point where flow velocity out and burning back are equal. It changes when primary air or gas rate is adjusted.
Flange	Extending rim or edge at one end of a pipe shaft that gives support or a finished appearance.
Flapper Flush Ball	The moving part of the flush valve that seals the water into the tank or allows water to exit the tank for the flush cycle. The most common replacement part used on conventional toilets.
Flapper Valve	The part on the bottom of the toilet tank that opens to allow water to flow from the tank into the bowl.
Flare Fitting	A fitting used to connect flex copper pipe, usually gas pipe
Flaring Tool	Tool used to create a cone-shaped enlargement at the end of a piece of tubing to accept a flare fitting.
Flex Coupling	Rubber coupling used to join DWV Pipe. Can be used to connect PVC to Clay or Cast Iron above or below ground. Also used for repairs, and attach by used of steel band clamps.
Flexible Connector	A braided hose that connects a faucet or toilet to the water supply stop valve. Serves as a riser but is much more flexible and easier to install. Usually stainless steel or PVC/Polyester reinforced hose.
Float Ball	The floating ball connected to the ballcock inside the tank that rises or falls with changing water levels in the tank, and actuates or shuts off the ballcock as needed.
Floating Flames	An undesirable burner operating condition, usually indicating incomplete combustion in which flames leave the burner port to ”reach” for combustion air.
Flocculant	A chemical substance that promotes the aggregation or coagulation of suspended particles in the water.
Flood Level Rim	The top edge of a receptacle from which water overflows.
Floor Drain	Drainage fitting that sits flush with the floor, used in basements and showers.
Floor Flange	A fitting that connects a toilet to a floor drain.
Floor Sink	Receptacle usually made of enameled cast iron located at floor level and connected to a trap to receive the discharge from indirect waste and floor drainage. Cleaner and more sanitary than regular floor drains. Usually used in hospitals & restaurants.
Flow Control Valve	Device designed to reduce water flow to a plumbing fixture. Often used to improve efficiency and reduce operating costs. Also a check valve that prevents flow reversal when heater is turned off.
Flow Rate	Rated in gallons per minute (GPM) or in gallons per hour (GPH)
Flue	A passageway for combustion by-products.
Flue Baffle	A device to deflect, check, or regulate flow through a pipe.
Flue Damper	A device to minimize heat loss through a venting system.
Flue Exhauster	A fan installed in the vent pipe which will provide a positive induced draft. Sometimes called a draft inducer.
Flume Spout	An open spout design that is also referred to as a waterfall spout.
Flush Joint	A Connection with both male and female threads cut into the pipe.
Flush-Mount Lavatory	Sink that sits flush and even with the countertop and is supported by a metal ring.
Flushing Surface	The interior surface of the bowl and all other surfaces which may come into contact with water during flushing.
Flushometer	Toilet valve that automatically shuts off after it meters a certain amount of water flow.
Flushometer Tank System	Toilet flushing system that uses supply water pressure to compress water to provide a pressurized flush as opposed to a gravity flush.
Flushometer Valve	The valve located at the bottom of a gravity-operated toilet flush tank, which opens when the trip lever is actuated, and closes when the tank has drained to the desired level. Usually also contains an overflow tube.
Flux	Paste applied to copper pipes and fittings before soldering to help the fusion process and prevent oxidation.
Foam Insulation	Insulation surrounding the surface of a water heater tank.
Foot Valve	A special type of check valve located at the bottom end of the suction pipe on a pump; it opens when the pump operates to allow water to enter the suction pipe but closes when the pump shuts off to prevent water from flowing out.
Footprint	The area of floor space taken up by a water heater or other appliance. Framed A bath enclosure system that mounts all glass or plastic panels in a metal frame.
Frameless	A bath enclosure system that minimizes the amount of metal used to hold the system panels and door in place.
Free-Standing	Term used to describe a bathtub that is free of walls on all sides.
Free Available Chlorine	The concentration of residual chlorine present as dissolved gas, hypochlorous acid or hypochlorite, not combined with ammonia or in other less readily available form.
Freeboard	The vertical distance between a bed of filter media or ion exchange material and the overflow or collector for backwash water; the height above the bed of granular media available for bed expansion during backwashing; may be expressed either as a linear distance or a percentage of bed depth.
French Drain	A covered ditch containing a layer of fitted or loose stone or other pervious material.
Friction Head Difference	The difference in head required to move a mass of fluid from one position to another at a certain flow rate within a piping system. It is also the specific energy required to overcome friction in the system.
Friction Loss	The loss of pressure caused by the turbulence created in water while traveling through the pipe.
Frost Line	The depth to which frost penetrates the earth.
Full-Finished	Refers to tubular products in which the weld has been processed to produce uniform strength and dimensions, and subsequently annealed to obtain proper corrosion resistance.
Full Hydraulic Capacity	The designed capacity of a pipe or conduit.
Ga.	Abbreviation for gauge, the wall thickness of tubing
GAMA	Gas Appliance Manufacturers Association
GFCI	Ground Fault Circuit Interrupter. A device to cut off the flow of electricity if a short circuit is detected.
GPF	Gallons Per Flush used in toilets. Current law requires maximum of 1.6 gpf. Older styles were usually 3.5 gpf.
GPG	Grains Per Gallon. A measurement of the amount of dissolved material in water. One grain per gallon equals 17.1 ppm
GPH	Gallons Per Hour. A measure of flow rates.
GPM	Gallons Per Minute. The rate of flow by which faucets and showerheads are measured and regulated.
Galvanic Action	The phenomenon of corrosion of an anode (positive terminal – like on a battery). When two dissimilar metals are immersed in an electrolyte, an electrical potential will exist between them. If the two are in an electrical contact, a current will flow. The metal that becomes the anode (negative) of this cell will corrode and dissolve while the cathode (positive) will be protected from corrosion.
Galvanic Series	A list of metals with those on the top of the list being attacked by those lower down in the list. The father apart on the list, the faster the attack.
Galvanizing	The process of applying a coating of zinc to the finished product to provide corrosion protection. The coating can be applied by hot dipping or electrolytic deposition.
Galvanometer	Laboratory instrument that detects and measures small electric current.
Gas Cock	Plug valve installed the main gas line and an appliance.
Gas Control Device	Is used to regulate gas pressure on a water heater.
Gasket	Flat device usually made of fiber or rubber used to provide a watertight seal between metal joints.
Gate	A device that controls the flow in a conduit, pipe, or tunnel.
Gate Diverter	The pop-up lever on a tub faucet that activates the diverter valve
Gauge (gage)	Device for registering water level, discharge, velocity, pressure, etc. A number that defines the thickness of the sheet used to make steel pipe. The larger the number, the thinner the pipe wall.
Gel / Grease Cap	Waterproof wire connector.
Gland	In a pump, the part that holds one half of the mechanical seal and attaches to the stuffing box.
Glaze	Glossy water-resistant, colored finish on vitreous china fixtures.
Globe Valve	A gate valve with a curved chamber.
Grab Bar	Safety bar installed in a bathtub or shower for use when bathing.
Gravity Operated Toilet	A toilet that relies on the natural downward pressure of water in a toilet tank to flush the toilet effectively.
Grains Per Gallon (gpg)	A common basis for reporting water analyses in the United States and Canada; one grain per U.S. gallon equals 17.12 milligrams per liter (mg/1) or parts per million (ppm). One grain per British (Imperial) gallon equals 14.3 milligrams per liter or parts per million.
Gray Water	Waste water from sinks, showers, and bathtubs, but not toilets.
Grease Trap	A device that captures grease entering a system before it reaches the sewer lines. Usually used in commercial applications such as restaurants or cafeterias.
Greensand	A natural mineral, primarily composed of complex silicates, which possesses ion exchange properties.
Grip Fitting	A compression-type fitting used on PB pipe.
Grooved Fitting	A gasketed mechanical pipe fitting made of ductile iron that is clamped onto a groove in a pipe rather than screwed onto threads. It is mostly used in commercial applications on pipes larger than 1 1/2” in diameter.
Ground Joint	A joint which consists of pressing two smooth mating surfaces together without a gasket or supplemental sealant.
Ground Joint Union	Pipe union that has a brass grounding section between the two halves.
Ground Water	Naturally occurring water rising from the water table of the surrounding land.
Grounding	Connecting a piece of electrical equipment to a ”ground wire” which is connected to the electrical system ground at the circuit breaker box. This helps to ensure that the circuit breaker will trip and cut off power in the event of a short circuit or damage to insulation.
Guide Arm	Valve which controls water flow into the toilet tank.
HBA	Home Builders Association
HD	Head
HP	Horsepower
HT	Hose Threads. Note: Garden hose threads are different from standard pipe threads.
HVAC	Heating, Ventilation, and Air Conditioning.
Hand-shower	A showerhead designed with a handle that’s connected to a water supply and a flexible hose.
Hanger	A device used to support pipes.
Hard Water	Natural water containing impurities in various proportions. Traditional hardness is a measure of calcium or dissolved solids in a solution, measured in parts per million. Hard water generally ranges from 100 to 250 ppm.
Hardness	The amount of dissolved minerals in water measured in grains per gallon (GPG). The most common minerals are calcium and magnesium.
Hardness Leakage	The presence of a consistent concentration of hardness in the effluent from an ion exchange water softener, often due to high concentrations of hardness or sodium in the water being treated (see Leakage).
Head	The pressure of water (or steam) in a closed system (see Pressure Head). It represents the differential in the gravitational force exerted by a liquid at two different depths.
Head Loss	The pressure of water as measured at a stated point, either in feet or in pounds per square inch (PSI).
Heat Exchanger	A heat transfer system.
Heat Sensors	Heat-triggered devices on sprinkler systems that release the flow of water.
Heat Trap	Restriction of heat loss through water connections to a tank.
Hermetic	Completely sealed, especially against the escape or entry of air.
Hold Down	A type of pipe anchor consisting of a U-strap bolted at either end onto a horizontal plate.
Hollow-jet Valve	A valve having a closing member that moves upstream to shut off the flow. The hollow-jet valve discharges a hollow or annular jet dispersed over a wide area.
Horizontal Branch	Lateral drain pipes that run from plumbing fixtures to the waste stack in a building or in the soil.
Horizontal Run	The horizontal distance between the point where fluid enters a pipe and the point at which it leaves.
Hose Bibb	An outdoor faucet, also used to supply washing machines.
House Trap	U-shaped fitting with two adjacent cleanout plugs visible at floor level if main drain runs under floor.
Hub & Spigot Piping	Gravity rated DWV or pressure pipe that has a bell-shaped section at one end and a straight section at the other. As lengths are assembled, the straight end of one fits into the bell of the next.
Hydration	The chemical absorption of water into a substance.
Hydraulic Pressure	Pressure that exists in a system containing non-compressible liquid.
Hydrolysis	The reaction of a salt with water to form an acid and a base.
Hydronic	System of forced hot water.
Hydrojet	Cold inlet tube designed to reduce sediment build-up and increase efficiency in a water heater.
Hydro Jetting (Service)	The process of clearing blocked pipes using high pressure water as a boring and flushing mechanism. More on Hydro Jetting Service
Hydrostatic Pressure	Pressure exerted by or existing within a liquid at rest with respect to adjacent bodies
Hydrostatic Test	Test using non-compressible liquid under pressure at a level equal to or greater than the maximum pressure that will be utilized when in use, such as in steam boilers.
Hypochlorite	The OCL anion; calcium and sodium hypochlorite are commonly used as bleaches and disinfecting agents.
ID	Inside diameter. All pipes are sized according to their inside diameter.
IPS	Iron Pipe Size (OD). Same as NPS. Standard pipe threads. Also Internal Pipe Swivel connection (female)
ISO	International Standards Organization based in Geneva Switzerland. Among the many standards it issues are pump and seal standards for the metric community.
ISO 9000	A series of five standards for developing a total quality management system. Developed by the International Standards Organization
Immersion	A term referring to something submerged in water.
Impeller	Rotating wheel with vanes found inside a centrifugal pump. As it spins at high speed it draws fluids in and thrusts them under pressure to the discharge outlet.
Incomplete Combustion	A product of inadequate ventilation which restricts the flow of air into an appliance. This may lower oxygen content in the surrounding air.
Incoming Inlet Temperature	Temperature of water entering the tank.
Indirect Waste Pipe	Waste pipe used to convey gray water by discharging it into a plumbing fixture such as a floor drain.
Induction Motor	The most common type used in industry. Has a slippage of 2 to 5 percent compared to synchronous motors.
Influent	The stream entering a unit, stream or process, such as the hard water entering an ion exchange water softener.
Injection	The drawing of primary air into a gas burner by means of a flow of fuel gas.
Inlet	An entrance, opening, or aperture for the intake of fluid or gas.
In-line Pump	Small pump which pumps fluid through a line on which it is supported and mounted.
Input	The amount of fuel used by a water heater in a given period of time, usually 1 hr.
Input Rate	The quantity of heat or fuel supplied to an appliance, expressed in volume of heat units per volume of time (BTUs/hour).
Input Rating	The gas burning capacity of an appliance in BTU’s per hour as specified by the manufacturer.
Insert Fittings	Fittings equipped with external, annular rings fir gripping, which are inserted into flexible rubber or plastic tubing as a connection.
Ion Exchange	A reversible process in which ions are released from an insoluble permanent material in exchange for other ions in a surrounding solution; the direction of the exchange depends upon the affinities of the ion exchanger for the ions present, and the concentrations of the ions in the solution.
Ionization	The process in which atoms gain or lose electrons; sometimes used as synonymous with dissociation, the separation of molecules into charged ions in solution.
Island Vent	An air admittance valve.
Isolation Mount	The four small rubber feet located beneath a whirlpool’s pump base, or attached to the pulse canister assemblies, designed to reduce noise and vibration when the whirlpool is running.
Instantaneous Water Heater	A type of water heater that heats water as it flows through a heat exchanger coil.
Insular	Kohler’s registered trade name for factory-installed insulation, which minimizes condensation on the outside of the tank when exposed to high humidity.
Insuliner	Kohler’s Registered trade name for factory-installed tank insulation, which minimizes condensation on the outside of the tank (also known as tank sweating) when exposed to high humidity.
Integral Stops	Stops that allow the owner to shut off water supply at the faucet for maintenance without shutting off the water supply to the entire house.
Integral Vacuum Breaker	A device typically used in a sink or shower sprayer to keep water from back-flowing into the fresh water supply.
Interceptor	Device for separating grease and oil from drainage system. (See grease trap.)
Isothermal	Action that takes place with no change in temperature.
JTU	Jackson Turbidity Unit
J Bend	The trap section, with a 180-degree bend, or a multi-piece P-trap. Also called a return bend.
J Hook	A pipe hanger in the shape of a ‘J’.
Jacket	Usually refers to the heating/ cooling jacket surrounding the stuffing box on some pumps; The outer casing (shell) of a water heater.
Jackson Turbidity Unit	(JTU) A quantitative unit of turbidity originally based on the comparison of a liquid (such as water) with a suspension of a specify type of silica, using the turbidity measure in a Jackson Candle Turbidimeter.
Jet	An orifice or other feature of a toilet that is designed to direct water into the trapway quickly to start the siphon action.
Jetport	Hydro-jet dip tube, which creates turbulence in the tank.
Johnni-bolts	Closet bolts, used to mount toilet bowls to the closet flange.
Joint	One length of pipe.
Joint Runner	Collar like device that keeps molten lead in place while sealing a joint in cast iron pipe.
Junction Box	Utility area where incoming current is connected in an electrical appliance.
kPa	Kilopascal. A metric unit for pressure. 100 kPa = one atmosphere.
KW	Kilowatt. A measure of the rate of supply of energy or power, equal to 1000 watts or 3412 BTU per hour.
Kafer Fitting	Cast iron drainage pipe fitting with threaded-on hub used to attach to existing cast iron lines
Kilowatt	One thousand watts.
Knockout Plug	PVC test plug
Kollar Kap	Styrofoam forms used to protect floor drains while concrete is being poured around them.
L Tubing	An industry standard for copper tubing defined by the tube wall thickness and identified by a ”blue” strip. Type ”L” copper tube wall is approximately 50% greater thickness than Type ”M”
LDO	Lint, Dust, and Oil
LP	Liquid Propane. A fuel for gas water heaters.
Laminar Flow	Streamlined flow of a fluid near a solid boundary.
Laminated Glass	Glass that has been made by uniting layers of glass in order to strengthen the glass.
Langelier’s Index	A calculated number used to predict whether or not a water will precipitate, be in equilibrium with, or dissolve calcium carbonate. It is sometimes erroneously assumed that any water that tends to dissolve calcium carbonate is automatically corrosive.
Lateral Sewage Line	A sewage line that connects one sewage pipe with another.
Laundry Tray	Laundry Tub
Laundry Tub	Very deep sink used in a laundry room for soaking or washing clothing.
Lav	Lavatory
Lav Tube	Water supply tube for lavatory.
Lavatory	A fixed bowl or basin with running water and drainage for washing. Bathroom sink.
Leach Field	Porous soil area, through which septic tank leach lines run, emptying the treated waste.
Leach Lines	Pipes that carry effluent from the septic system out to the leach field.
Leakage	Loss of fluid usually due to mechanical breakdown or gasket wear.
Lean Mixture	An air-gas mixture that contains more air than needed for complete combustion of the gas.
Leader Pipe	A pipe that carries rainwater to the ground or sewer.
Lien	A legal right to hold another’s property, or to have it sold, or applied for payment of a claim, especially to satisfy a debt.
Lien Release	A written document from the contractor to the owner that releases the Lien (mechanic’s or material) following its satisfaction.
Lien Waiver	A written document from a contractor or material supplier having lien rights against an owner’s property that relinquishes all or part of those rights.
Lifting Flame	See Floating Flame
Length	A unit of linear measure for pipes, such as 10 or 20 ft.
Life Cycle Labs	A place where water heaters are tested at an accelerated rate to simulate life expectancies.
Light Duty	Small commercial applications.
Lime	See sediment.
Limit Stop	Faucet control unit used to adjust maximum water temperature.
Lock Nut	Nut fitted into a piece of pipe and screwed onto another pipe to join the two pieces.
Low Consumption Toilet	A class of toilet designed to flush using 1.6 gallons of water or less. Also known as ”Water-saving” toilets.
M Tubing	An industry standard for copper tubing defined by the tube wall thickness, identified by a ”red” stripe
MC Tank	Acetylene tank holding 10 cu.ft. of gas, used for plumbing, once used to fuel motorcycles.
MCL	Maximum Contaminant Level The maximum level of a contaminant allowed in water by federal law. Based on health effects and currently available treatment methods.
MHT	Male Hose Threads (threads on outside of connection).
MIPC	Male Iron Pipe Connection. Standard external threads on pipe and fittings.
MNPT	Refers to the male pipe thread, in which the threads are on the outer side on the connection fitting.
MPN	See Most Probable Number.
MPX	Male Pipe Swivel Connection.
Macerator	A device installed in a drain line between a toilet and the soil stack to reduce solids to liquid form.
Magnesium	One of the elements in the earth’s crust, the compounds of which when dissolved in water make the water hard. The presence of magnesium in water is a factor contributing to the formation of scale and insoluble soap curds.
Main	The primary artery of supply of the water supply or drain system in which all the branches connect. In the case of drains, known as the Main Vent.
Male Fitting	Fitting that is inserted into another fitting.
Male Threads	Threads on the outside of pipes and fittings.
Malleable Fittings	Fittings made of cast iron. Metal which is soft and pliable.
Manganese	An element sometimes found dissolved in ground water, usually with dissolved iron but in lower concentration; causes black stains and other problems similar to iron. It can be removed by a water softener or it can be precipitated by chlorine at a pH of 9.5 or above.
Manganese Greensand	Greensand that has been processed to incorporate in its pores and on its surface the higher oxides of manganese. The product has a mild oxidizing power, and is often used in the oxidation and precipitation of iron, manganese and/or hydrogen sulfide, and in their removal from water.
Manhole	Access opening to a hole, usually with a cover, through which a person may enter a sewer, boiler, drain, etc. (usually round to prevent the cover from falling into the opening).
Manifold	A fitting that connects a number of branches to the main; serves as a distribution point.
Manifold Pressure	The gas pressure in an appliance manifold upstream of the burner orifices.
Manifolded Installation	Paralleling of water heaters for large hot water demand applications.
Mapp Gas	A colorless, flammable gas made by combining liquified petroleum gas with Methylacetylene-Propadiene. It is a stable, non-toxic fuel used in brazing and soldering.
Mechanic’s Lien	A lien obtained by an unpaid subcontractor or supplier through the courts. When enforced, real property – such as your home – can be sold to pay the subcontractor or supplier
Mechanical Controls	Dials, slides, switches, knobs, buttons, and so forth used to operate ranges, ovens and cook-tops.
Mechanicals	The wiring, plumbing and heating and cooling systems in a building; also the components with moving parts such as furnaces, plumbing fixtures, etc.
Metal fatigue	A breakage of the metal caused by the bending and flexing or the expansion and contraction of a metal part beyond its endurance limit.
Meter Tailpiece	An adapter connecting a water meter to the water supply line.
Meter Tile	The cylindrically shaped casing that forms the pit to hold a water meter. It’s usually made of plastic.
Micron	A unit of measure, one thousandth of a meter. Used to describe the pore size of filters.
Millivolt	One thousandth of a volt.
Mini-Widespread	A special style of bathroom lav faucet having separate spout and handles, but small enough to fit 4 inch center-to-center faucet holes.
Minimum Run Time	The minimum length of time that the pump should run while refilling the pressure tank.
Mission Coupling	A neoprene flex coupling, connecting pvc to pvc or clay to pvc.
Mixer	The portion of a burner where air and gas are mixed before delivery to the burner ports.
Mixing Valve	Mixes hot and cold water to achieve a specified delivery temperature.
Moenstone	A blend of ceramic-like quartz (70%) and acrylic polymer (30%) that is impervious to chips or water spots.
Monitor Cover	The cast iron lid that fits over a flange casting which is mounted on meter tile in a water meter pit. It consists of an outer lid, an inner lid, and the flange casting in one or two pieces.
Monobloc Faucet	A single-handle faucet, usually a lever.
Most Probable Number	Most Probable Number (MPN) The term used to indicate the number of organisms which, according to statistical theory, would be most likely to produce the results observed in certain bacteriological tests; usually expressed as a number in 100 ml of water
Multi-Port Valve	Rotary type backwash valve. Can replace up to 6 regular gate valves. Serves various functions.
Multi-Stage Pump	A pump that has more than one impeller.
Municipal Water	Water supplied by a city for public use; tap water. Usually held in a reservoir.
NEMA	National Electrical Manufacturers Association
NH	No Hub
NKBA	National Kitchen and Bath Association
NOM	Nominal. Usually refers to the Inside diameter of trade sizes of copper pipe and some CPVC pipes. Not for Iron Pipe connections. For example, a 1/2” NOM Comp. Fitting is actually 5/8” because 1/2” pipe has an OD of 5/8”.
NPS	National Pipe Straight threads standard, Same as IPS
NPSP (Discharge)	Non Point Source Pollution. Nutrients, sediments, toxic substances, and pathogens that degrade waterways. NPS occurs mainly through stormwater runoff.
NPSHA	Net Positive Suction Head Available to prevent cavitation of the pump. It is defined as: Atmospheric pressure + gage pressure + static pressure – vapor pressure – friction loss in the suction piping.
NPSHR	Net Positive Suction Head Required to stop a pump from cavitating. This number is provided by the pump manufacturer.
NPT	National Pipe Tapered thread standard. The same as IPS.
NSF	National Sanitation Foundation
Natural Gas	A colorless, odorless fuel derived from the earth, consisting primarily of Methane (CH4). Odors are added to aid in leak detection.
Neo Angle Base	A shower base designed to allow the shower to fit into a corner using minimal floor space while maintaining an elegant look.
Negative Pressure	Less than atmospheric pressure.
Net Usable BTU	That portion of a fuel’s heat energy actually transferred into the water by a heater.
Nipple	A short length of pipe installed between couplings or other fittings.
Nipple Extractor	A tool used to unscrew sections of pipe.
No-Hub Connector	A connector for no-hub iron pipe consisting of a rubber sleeve and a stainless steel band secured by hose clamps. A variation, a neoprene sleeve with two adjustable steel bands, is used for connecting dissimilar materials, as when connecting new plastic pipe to an existing cast-iron drainpipe
Non-CFC Foam	Insulation that minimizes the use of Chlorofluorocarbons.
Non-Ferrous	Not containing iron.
Non-Potable	Not suitable for drinking.
O-Ring	Round rubber washer used to create a watertight seal, chiefly around valve stems.
OD	Outside Diameter
OEM	Original Equipment Manufacturer.
Oakum	Loosely woven hemp rope that has been treated with oil or other waterproofing agent; it is used to caulk joints in a bell and spigot pipe and fittings.
Oil Powered	A water heater that uses oil as its fuel source.
One-Piece Toilet	A toilet in which the tank and bowl are manufactured as a single vitreous china fixture. One-piece toilets usually have a lower profile than two-piece toilets.
Operating Cost	The cost of running a water heater for a given time period.
Orbital Weld	A circumferential, full fusion weld used to join together two lengths of tubing. It is a GTAW welding process. Usually to join coiled lengths.
Organic Matter	Plant and animal residues, or substances made by living organisms.
Orifice	An opening through which gas is discharged and whereby the flow of gas is limited and/or controlled.
Outlet / Discharge	The opening through which the water exits the pump.
Outlet Sewer	Pipe section in a septic system which runs between the septic tank and the drainage field.
Outside Diameter	The diameter of a pipe measured from the outside edge. (OD)
Overflow Tube	Overflow hood On a bath drain, the decorative hood concealing the overflow. The vertical tube inside a toilet tank that directs water into the bowl in case the ballcock malfunctions. It is usually part of the flush valve. It prevents potential water damage caused by a tank overflow. A ”constant-running” condition alerts the user to a problem. On most toilets, the overflow tube also has a refill tube flowing into it, which directs water from the ballcock through the overflow tube to the bowl, after a siphon break.
Ozone	An unstable form of oxygen (O3 ), which can be generated by an electrical discharge through air or regular oxygen. It is a strong oxidizing agent and has been used in water conditioning as a disinfectant.
P Trap	See Trap
P & T Relief Valve	Pressure and Temperature Relief Valve – Same as T & P
PB	Polybutylene. A flexible plastic tubing used in water supply systems where allowed by code. Also, polished brass finish on faucets.
PDI	Plumbing and Drainage Institute
PE	Polyethylene plastic material. Also Plain End pipe.
PEX	Cross-linked polyethylene. PEX tubing is commonly used for hydronic radiant floor heat, but increasingly also used for water supply lines. Stronger than PE.
PH	Potential Hydrogen. The hydrogen ion concentration of water to denote acidity or alkalinity, measured on a scale of 0 to 14. Below 7 denotes acidity; above 7 denotes alkalinity.
PHCCA	Plumbing Heating Cooling Contractors Association
P O Plug	Lavatory drain with separate removable plug
PoS	Porcelain on Steel. A finish commonly used on sinks and tubs.
PP	Polypropylene Pipe.
PPM	Parts Per Million. A unit of measure for impurities in water.
PR	Pressure Regulator. Usually required if water pressure ever exceeds 80 PSI on potable water supplies inside a structure.
PSI	Pounds per Square Inch
PSIG	Pounds per Square Inch Gauge.
PVC	Polyvinyl Chloride. A rigid white or cream-colored plastic pipe used in non-pressure systems, such as drainage, waste, and vent systems.
PVD	Physical Vapor Deposition. A modern plating process used mostly with polished brass or gold finishes on faucets. Vaporized zirconium reacts with nitrogen and other gases to form a very durable surface, which will not tarnish or discolor.
Packing	Fibrous material that is used on faucets to prevent leaks.
Packing Nut	The nut that holds the stem of a faucet in position & holds the packing material.
Parallel System	Two or more identical size heaters piped with water connections, that is, cold water travels equal distance into the inlets of the heaters from a ”T” connection and hot water travels equal distance from the outlet of the heaters to a ”T” connection.
Peak Hour Demand	Time when the largest demand for hot water is needed.
Peak Load Period	The period of the day in which the system has the greatest demand.
Penal Valve	A commercial flush valve, so-named because of its use in penal institutions.
Perfect Vacuum	Theoretically, space without matter in it. A perfect vacuum has never been obtained.
Perforated Pipe	Pipe designed to discharge water through small, multiple, closely spaced orifices or nozzles, placed in a segment of its circumference for irrigation purposes
Petcock	A small faucet for draining liquids or relieving air pressure.
Phase	For ease of production and distribution, A.C. is distributed in what is known as a 3 phase supply using three active wires and one neutral wire.
Phenol	A poisonous and carcinogenic chemical often found in municipal water supplies. Also known as carbolic acid, phenol is a benzene derivative.
Pickling	Pipe immersed into acid bath for removal of scale, oil, dirt, etc.
Piezo Switch	The electronic switch the bather uses to control the whirlpool and optional heater. This switch, based upon the piezo-electric effect, generates a voltage when pressure is applied to it.
Pilot	A small burner used to ignite the main burner.
Pin	External (male) threaded end of pipe.
Pipe Dope	Industry term for pipe-joint compound. Substance applied to threaded fittings to create a watertight seal.
Pitch	Downward slope of a drain pipe in the direction of the water flow.
Plug	Male threaded fitting which seals the end run of a pipe when fitted into a female threaded fitting.
Pivot Door	A shower door that rotates on two metal pivots at the top and bottom of the door.
Plumb	Precisely vertical. Also to test for, or to make vertical. Also to perform plumbing work.
Plumber’s Helper	A plunger
Plumber’s Putty	Pliable putty used to seal joints between drain pieces and fixture surfaces.
Plumbing Tree	Prefabricated set of drain waste, vent, and supply lines.
Pneumatic	Pertains to devices using compressed air.
Point of Use	Small water heater used for remote locations.
Pop-up Assembly	The drain mechanism of a faucet installed on a lavatory. The drain stopper ”pops” up and down.
Pop-up Drain	Type of drain assembly for lavatory and bath. When a lavatory lift rod or bath overflow plate lever is lifted, the pop-up drain closes so the lavatory or tub retains water.
Poppet	Valve that rises perpendicularly to or from its seat.
Porcelain	White ceramic ware that consists of quartz, kaolin, and feldspar. It is fired at high temperature on steel or cast iron to make the surface of some bathtubs, kitchen sinks, and bathroom lavatories.
Porcelain Enamel	Vitreous enamel. Often refers to pressed steel products with a porcelain glaze.
Porosity	A measure of the volume of internal pores, or voids, in ion exchangers and filter media; sometimes expressed as a ratio to the total volume of the medium.
Port	An opening in a burner head through which gas or an air-gas mixture is discharged for ignition.
Positive Displacement Pump	Known as a ”PD pump.” Gear, sliding vane, progressive cavity, lobe etc. the capacity determined by the pump speed. The maximum head is determined by the horsepower available and the casing strength.
Potable Water	Water that is suitable for drinking.
Potentiometer	An adjustable resistor used to vary the sensing distance of the touch-less faucet.
Powder-Coat	A technique for applying paint to aluminum shower door frames. The aluminum is covered with a powder of dry paint particles and is baked in an oven. This causes the powder to melt and harden into a tough, colorful finish.
Power Venting	Mechanical draft exhaust to outside, usually utilizing room air to support combustion.
Pre-Charged Tank	A water storage tank pre-charged with air at factory featuring a vinyl bag to separate water from air which prevents water-logging. This tank design provides greater draw-down than standard tanks. Pre-charged tanks do not require air volume control.
Pre-Heated Water	Water that has been tempered (heated) for inlet supply.
Pressure Balanced Valve	A shower mixing valve that automatically maintains balance between incoming hot and cold water supplies by immediately regulating fluctuations in pressure. As a result, temperature remains constant, though the outlet pressure may drop. Also called an anti-scald valve.
Pressure Head	Pressure in a plumbing system. The unit of measure which is the vertical force exerted by water at a depth of one foot.
Pressure Loss	The term given for the loss of pressure that occurs whenever water moves through a pipe or when water moves uphill against the force of gravity. If the total pressure loss in a piping system exceeds the available static water pressure the water will not flow.
Pressure Reducing Valve	A valve that automatically reduces inlet water pressure to a specified value at its outlet under static cold water conditions.
Pressure Regulator	A device for controlling and maintaining a uniform outlet gas pressure.
Pressure Tank	Device used to pump water from a well.
Pressure Tubing	Tubing used to conduct fluids under pressure or at elevated temperatures or both, and produced to stricter tolerances than pipe.
Primary Air	Air which is mixed with gas before the gas leaves a burner port to burn. Ideal burning condition generally is 10 cubic feet of air per one cubic foot of gas.
Primary Air Inlet	The opening(s) through which primary air is admitted into a burner.
Priming Jet	Opening in bowl through which tank-supplied water flows, designed to propel waste up into the trapway.
Pull-out Spray	Single-control kitchen faucet which offers a retractable hose and spray-head to be used for food preparation and cleaning.
Public Sewer	A common sewer directly controlled by public authority.
Pumping Level	The lowest water level reached during pumping operation.
Purged Line	A plumbing line in which the faucet has been opened and allowed to run for a specified length of time, usually1-5 minutes.
R & D	Reamed and Drifted. Pipe commonly used in water wells having a special, heavy-duty coupling and a guaranteed I.D. clearance.
RF	Recovery Factor – Rating based on the efficiency of the product which is input required to raise 1 gallon of water 1 degree Fahrenheit.
Rail Fittings	Fittings with setscrews rather than threads, which hold pipes used for hand railings. Available in various sizes and configurations to suit a number of applications. Not used for plumbing or conduit.
Rated Storage	Volume Quantity of water stored in a tank.
Raw Water	Water supplied to the plant before any treatment.
Reamer	A grinding tool used to level or remove burrs from valve seats in faucets so that the valve stem will fit properly.
Recessed Tub	A tub that has a decorative finish on one side only, and surrounded by three walls. The apron, or skirting, may not be included and must be ordered separately. The most popular style.
Recirculating Harness	PVC tubing setup that circulates water throughout a whirlpool system, delivering water to the jets.
Recovery	The amount of water in gallons that can be heated in one hour. (gph).
Recovery Capacity	The amount of water in gallons per hour raised 100 degrees F at a given thermal efficiency and BTU per hour input.
Red Water	Water which has a reddish or brownish appearance due to the presence of precipitated iron and/or iron bacteria.
Reducer	A fitting that connects pipes of different sizes together.
Reed Switch	A serviceable, magnetic sensing switch that triggers the water flow to stop when the neck jet pillow (with magnet) is removed from the whirlpool.
Refill Tube	The tube that directs water from a ballcock into the overflow tube to refill the bowl after a siphon break.
Relief Valve	A valve that opens to relieve excess temperature.
Repair Clamp	Sleeve type clamp used to repair a split pipe, held in place by bolts.
Return Circulation System	Tempered water from or near the point of usage which eliminates waste of hot water used for long runs and adds storage to the system.
Revent	Pipe installed specifically to vent a fixture trap. Connects with the vent system above the fixture.
Reverse Osmosis	A water treatment method whereby water is forced through a semi permeable membrane which filters out impurities.
Reverse Trap Water Closet	A water closet having a siphonic trapway at the rear of the bowl, and integral flushing rim and jet. Min. dimensions are 9” x 8” water spot and 1-1/” ball pass.
Rigid Pipe	Pipe designed to transmit the backfill load to the foundation beneath the pipe. Rigid pipe must be supported on the bottom portion of the pipe
Rim Holes	A series of small holes in the underside of a toilet rim, around the circumference of the bowl. Incoming water flows down into the bowl through these holes, creating a rinse effect or wash over the entire inner surface of the bowl.
Riser	A vertical metal or plastic tube or assembly that connects a faucet to the water supply stop valve. Usually made of copper. Metal Flex Risers are corrugated to facilitate bending. Also a supply line that rises from one story to the next.
Residual Chlorine	Chlorine Chlorine remaining in treated water after a specified period of contact time to provide continuing protection throughout a distribution system; the difference between the total chlorine added, and that consumed by oxidizable matter.
Roller Hanger	A pipe hanger similar to a clevis hanger except that the yoke bolts to a roller rod instead of a metal strap. This roller rod supports the pipe and permits horizontal movement.
Roman Spout	Deck-mounted faucet spout.
Roof Drain	A drain installed at the low spot in a roof that channels water into a drainpipe to prevent pooling.
Roof Flashing	Sheet metal installed at any break in a shingled roofline to prevent leaks. Also around sewer vents, fluepipes.
Root Valve	A multi-port valve commonly used on gauges or switches in high pressure, high temperature, or under otherwise severe process conditions. Typically built with non-rotating and non-threaded stems.
Rough-In	Installation of the drain, waste, vent, and supply lines in a structure to the proposed location of each fixture.
Rough-In Dimensions	The distance from a finished wall or floor to the center of the waste or supply opening or mounting holes on a plumbing fixture.
Round Front Bowl	Standard shape of the front of a toilet bow, having dimensions of 14” wide by 16-1/2” long from center of seat hinge holes to front outside rim edge.
Run	A complete or secondary section of pipe that extends from supply to fixture or drain to stack.
Running Trap	An in-line trap mounted in a horizontal drainpipe, where the inlet and outlet are parallel.
SAE	Society of Automotive Engineers standard; a thread size used on nuts and bolts but not pipe connections.
SJ	Slip Joint.
SMLS	Seamless pipe.
SN	Satin Nickel finish.
SS	Stainless Steel.
STD	Standard
SV	Service Victory. A designation for service weight cast iron drainage pipe.
Saddle Tee	Fitting that taps into the side of a pipe, used to make quick connection to an existing line.
Saddle Valve	A valve mounted on a pipe run by a clamping device, or saddle tee to provide a water supply for a low-demand device.
Safe Drinking Water Act	An amendment to the Public Health Service Act, which was passed in 1976 to protect public health by establishing uniform drinking water standards for the nation. In 1986 SDWA Amendments were passed that mandated the EPA establish standards for 83 drinking water contaminants by 1992 and identify an additional 25 contaminants for regulation every 3 years thereafter.
Safety Shutoff Valve	A device on a gas appliance that shuts off the gas supply to prevent a hazardous situation. A flame safety shutoff operates when the actuating flame becomes extinguished.
Sag Pipe	A section of a sewer line that is placed deeper in the ground than normal in order to pass under utility piping, waterways, rail lines, highways, or other obstacles. The sewer line is raised again after passing under the obstacle.
Sanitary Fitting	Fitting that joins the assorted pipes in a drain, waste, and vent system, designed to allow solid material to pass through without clogging.
Saponification	The process in which a fatty acid is neutralized with an alkali or base to form a soap.
Sanitary Sewer	House drain that carries wastewater away from the house to a sewer system or septic tank.
Scale	A thin coating or layer, usually calcium on the bottom of a tank or interior parts that may prevent heat transfer.
Schedule	Numbers assigned to different wall thicknesses of pipe (e.g. sch 40).
Scupper Drain	A drain normally located on a roof or deck that allows rain water to drain off.
Seal-Off Fitting	Fitting which prevents gas leakage from moving from one section of pipe to another.
Sealed Combustion	Sealing of combustion chamber to prevent spillage of combustion products.
Sealed Combustion Heater	A heater which pulls combustion air from outside the structure and vents combustion by-products to the outside.
Seamless Pipe	Pipe with no weld in the circumference.
Secondary Air	The remaining air needed for complete combustion besides primary air. This is the air surrounding the flames outside the burner ports.
Sediment	The substance that settles on the bottom of a water tank. Also known as lime.
Self-Rimming Sink	Sink with no metal ring that has a built-in lip of the same material which supports it in the vanity top.
Sequestering Agent	A chemical compound sometimes fed into water to tie up undesirable ions, keep them in solution, and reduce their effects. For example, polyphosphate can sequester hardness and prevent reactions with soap.
Series System	System where a primary heater preheats water to a given desired general purpose temperature and feeds into another heater.
Self-Rimming	A style of bathroom sink with a rolled and finished edge.
Serial / Model / Rating Plate	A permanent information plate attached to major home appliances. The plate includes product model and serial numbers, plus information about wattage or BTU requirements.
Service Entrance	Pipe connecting the water company piping to the water meter.
Service Pressure	The range of pressure in the pressure tank during the pumping cycle, usually expressed in pounds per square inch gauge (P.S.I.G.).
Service Sink	Deep fixed basin, supplied with hot and cold water, which is used for rinsing of mops, disposal of cleaning water, or washing clothes and other household items.
Service Tee	Tee fitting with male threads on one run opening and female threads on the other two.
Sewer Ejector	See Ejector.
Sewer Gas	Gases, esp. methane, which may be combustible and poisonous from the decay of organic materials in the sewer system.
Shallow Well	A well with a pumping head of 25 feet or less, permitting use of a suction pump.
Shroud	Color-matched component under a wall-mount lavatory that covers the drain outlet for aesthetic purposes.
Shower Receptor	A one-piece base (floor) unit used as a shower, for example, to catch water and direct it to a center drain.
Shutoff Valve	Usually refers to angle stops installed under sinks and toilets, but also valves installed on branch lines and alongside the meter.
Side Cutter	A heavy duty auger tip for large diameter pipes.
Sight Hole	Generally a window on oil-fired products that allows the viewing of burner and flame patterns.
Sillcock	See Hose Bibb
Simplex Basin	An ejector pump container usually 18” x 30” for single family homes. Single Threshold Type of shower base used in a three wall installation with the threshold being the side with the door.
Siphon	A pipe connecting two canals. A tube or pipe through which water flows over a high point by gravity.
Siphon Break	The point in a toilet flush cycle when air is re-introduced into the trapway, breaking the siphonic action. This is characterized by the deep gurgling sound heard at the end of a flush.
Siphon-Jet Water Closet	A toilet having a siphonic trapway at the rear of the bowl and an integral flushing rim and jet.
Siphon-Vortex Water Closet	A toilet having a trapway at the rear of the bowl integral flushing rim and a water supply system with or without a jet, which does not feed directly into the trap.
Siphon Wash Closet	A toilet having a trapway at the rear of the bowl and integral flushing rim, and minimum dimensions of 5” x 4” water spot and 1-1/2” ball pass.
Siphoning	The suction or pulling effect that takes place in the trapway of a toilet as it is filled with outgoing water and waste.
Sisson Joint	This is a joint between pipes that is larger on one end than the other. NOTE: Sisson joints are often prohibited for drainage system purposes.
Sleeve	Pipe which is passed through a wall for the purpose of inserting another pipe through it.
Slide Bar	Type of shower component designed for the attachment of a hand-shower. The mounting bracket can be adjusted at different heights to accommodate individual preference.
Sliding Inner Door	A door that slides along the combustion chamber radius for easy access to the burner and pilot.
Slip Gasket	Elastomer (natural occurring elastic substance) gasket, usable with a hub and spigot pipe because it has a tapered cross section.
Slip Joint	A connection made with compression fittings.
Soda Ash	Common name for sodium carbonate, Na2CO3 a chemical compound used sometimes used in soap and detergents to neutralize acid water.
Soft Flame	A flame partially deprived of primary air such that the combustion zone is extended and the inner cone of the flame is ill-defined.
Soft Water	Water that has a low calcium and magnesium content.
Soil Cutter	A device used to cut No Hub pipe, consisting of a handle and a cutting chain, similar to a chain wrench in appearance.
Soil Pipe	A sewer pipe for carrying off waste from toilets.
Soil Stack	Largest vertical drain line to which all branch waste lines connect. This line carries waste to the sewer line.
Solder	A metal alloy that is melted to create a fused joint between metal pieces. Also the act of melting solder into the joint.
Solute	The substance which is dissolved in and by a solvent. Dissolved solids, such as the minerals found in water, are solutes.
Solvent Weld	Any of the types of PVC pipe and fittings that are fastened together with solvent-based cement.
Spark Ignition	Intermittent ignition devices that utilizes a spark to light a flame.
Spark Test	A test procedure to evaluate the integrity of the glass lining.
Specific Gravity	The ratio of the weight of a specific volume of a substance compared to the weight of the same volume of pure water at 4oC.
Specific Heat	Amount of heat required to raise the temperature of a kilogram of a substance one degree Celsius.
Spigot	The plain end of a cast-iron pipe. The spigot is inserted into the bell end of the next pipe to make a water tight joint.
Spigot Soil Adapter	Hub adapter to connect PVC with soil pipe.
Spline Adapter	Device sometimes required to form a mating connection between the splines of a valve stem and the splines inside a faucet handle.
Spud	A threaded opening on the water heater tank. Also a tool for digging having characteristics of a shade and chisel.
Stack	The vertical main in the drain, waste, and vent system, extending one or more stories.
Stacking	The ability of hot water to form layers of different temperatures in the tank stratification.
Stainless Steel Sink	Steel sinks made of solid stainless material, durable, and immune to rust and corrosion. The gauge measures the thickness of the steel, with a lower number indicating thicker steel. Their underside is often sprayed with a rubberized undercoating to provide a sound-deadening barrier, eliminate condensation, and reduce heat transfer.
Stand Pipe	Open vertical pipe that receives water from a washing machine. Also the vertical pipe run supplying water to a fire sprinkler system; also large vertical pipe into which water is pumped in order to produce a desired pressure; a high vertical pipe or reservoir that is used to secure a uniform pressure in a water-supply system
Standing Pilot	See Pilot
Static Discharge Head	The vertical distance from the pump to the highest outlet in the water system Stand By Loss. The amount of heat lost while a unit is in stand by mode.
Static Lift	The vertical distance between source and discharge water levels in a pump installation.
Static Pressure	The pressure when no water is flowing.
Static Water Level	The undisturbed level of water in the well before pumping.
Stem	Part of the faucet that holds the handle on one end and the washer on the other. Stiffener A galvanized bushing used to strengthen tubing to fit in a leadpak coupling.
Stillson Wrench	Pipe wrench
Stop	The shutoff valve under sinks and toilets. Allows water supply to be cut off to one fixture without affecting the water supply to other fixtures.
Stop and Drain Fitting	Plug-type valve used to tap into a water main to control the flow to a branch line, which has a side opening to shut off the water and allow it to drain out so the pipe won’t freeze.
Storage Tank	A tank used to hold a specific volume of water.
Storm Drain	Drain used to receive and convey rain water, surface water, and ground water away from buildings.
Straight Cross	Fitting that connects four pipes of the same diameter.
Straight Pipe Threads	A special kind of straight thread used only on iron pipe, toilet, and faucet fittings. A cone seal or gasket is usually included because straight threads will not form a complete seal without a gasket of some kind.
Straight Stop	An emergency stop valve that is usually installed before the water supply line to toilets and faucets. Similar to angle stops but the line does not change direction.
Strainer Pot	A housing on the influent side of a pump that serves as a priming chamber and a receptacle for the strainer basket.
Strap Wrench	Tool with metal body and heavy cloth or metal mesh belt used for turning pipe.
Street Ell	A 90 degree elbow joint with a hub on one end and male threads on the other. Used to make an angled connection between pipe or tubing and a fitting with a hub.
Stub-Out	Short lengths of pipe installed during rough-in to which fixtures and drains will eventually be installed.
Stud Guard	Short band of metal attached to wall studs to prevent nails from penetrating and damaging pipes
Stuffing Box	That portion of the pump that held the packing and now holds the mechanical seal.
Submergence	The distance the ejector, foot valve or submersible pump is installed below the pumping level.
Suction Head	The head on the suction side of the pump. This is subtracted from the discharge head to determine the head being produced by the pump. It is a sum of the static, pressure and friction heads.
Suction Static Lift	Same as Suction Static head. This term is only used when the pump centerline is above the suction tank fluid surface.
Sulfate	A chemical compound that can cause laxative effects and give off a medicinal taste in concentrations around 30 gpg. In high concentration with high calcium hardness, it forms a white insoluble compound that is difficult to remove.
Sulfur	A yellowish solid element. The term also commonly describes to water containing hydrogen sulfide gas. The presence of Sulfur is marked by a smell like rotten eggs.
Sump	A pit or pool for draining, collecting, or storing water. A chamber which provides water to the pump.
Supply Kit	Usually a kit of all parts needed to connect a faucet or toilet to the pipes coming out of the wall. Usually includes stop valves, water connectors, and escutcheons.
Supply Stop	The valve controlling water supply to a toilet.
Surface Mount	Typically refers to thermostats mounted on the outside of the tank that senses temperature through the steel tank.
Surface Pump	A mechanism for removing water or wastewater from a sump or wet well.
Suspended Solids	Solid particles in water which are not in solution.
Sweating	Term for soldering. Also formation of condensation on the outside of pipes or toilet tanks.
Sweep	A drain ell fitting with a long radius that allows for smooth passage of waste. Fittings with abrupt changes of direction, such as a vent tee, may only be used for vents.
Swing Joint	A flexible sprinkler connection made by connecting three threaded elbows fittings together.
TBE	Threaded Both Ends
T & C	Threaded and Coupled. Some cast iron pipe is sold threaded with a coupling attached.
TDS	Total Dissolved Solids.
TO	Threads Only.
T & P Valve	Temperature & Pressure relief valve. A safety device used to expel excess pressure or heat from inside a tank.
TPI	Threads Per Inch
T & S	Tub and Shower
Tailpiece	Section of pipe that runs between a fixture outlet and the trap.
Tail Pipe	The pipe added below the jet assembly, in a weak well application.
Tank Fixture	A reservoir for flush water. On a conventional toilet, the ballcock, flush valve, and trip lever are installed in the tank. A tank lid closes the top tank opening.
Tank Cross	A double-tee-shaped fitting installed between a shallow well pump and the bladder tank with integrated valve and gauge fittings, and an outlet for a pressure-relief valve.
Tank-less Water Heater	Instantaneous water heater.
Tannin (Tannic acid)	A substance occurring naturally in well water. It is produced by decaying vegetation, and causes the water to have a yellow of light brown color and can provide a bitter taste. There is currently no EPA regulatory level for tannin in water.
Tap Adapter	Fitting with one plain end and one threaded female end.
Tap Tee	Cast iron tee with a threaded female side inlet.
Tap Water	Water provided by a water company by way of the home’s plumbing system.
Tapered Pipe	Standard type of threads used on iron pipe and pipe fittings.
Tee	T-shaped fitting with three openings that allow another pipe to be joined at a 90 degree angle, used to create branch lines.
Teflon Tape	A fluorocarbon polymer with non-sticking properties used to wrap pipe threads to seal a joint.
Temperature Rise	The number of degrees Fahrenheit that incoming water must be raised to reach the desired water temperature.
Tempered Glass	Glass that has been annealed or strengthened by a process of gradually healing and cooling. Once a piece of glass has been tempered, it cannot be cut. If it breaks, it breaks into many small pieces. By code, all shower doors must be made of tempered glass.
Tempering Valve	An in-line hot / cold mixing valve.
Test Plug	A rubber plug that is used to seal off sections of pipe to allow testing for leakage.
Test Tee	A tee with a removable plug for permitting access to a drainage line.
Therm	Measurement of 100,000 BTU’s.
Thermal Efficiency	Ability to transfer and absorb heat from fuel sources into the water.
Thermal Expansion	The effect of water expanding when heated.
Thermal Stratification	See Stacking.
Thermocouple	Small electric generator. Electron flow between the hot junction of 1200 degrees F and cold junction of 600 degrees F creates millivoltage.
Thermopile	Apparatus that consists of a number of thermocouples combined so as to multiply the effect and is used for generating electrical current.
Thermostat (Lower)	Device that automatically maintains a predetermined temperature in an appliance.
Thermostat (Upper)	Device that automatically maintains a predetermined temperature in an appliance, usually equipped with a safety shutoff.
Thermostatic Valve	Pressure-balancing shower mixing valve with automatic temperature control. When temperature or pressure fluctuations occur at the water inlets, a thermal actuator adjusts the hot and cold ratio to maintain the original temperature setting.
Throat-Plate	The underside portion of some faucet spouts which also use a top shroud to cover an assembled faucet waterway. The throat-plate is only visible when viewed from a very low angle.
Threaded	A helical or spiral ridge on a screw, nut, or bolt.
Tile Rise (Buttress)	The raised portion of a shower curb that is on more than one level.
Total Dissolved Solids	A measure of the total amount of dissolved matter in water.
Total Head	The difference between the head at the discharge and suction flange of the pump ( syn Total Dynamic Head, pump head, system head).
Touchless Faucet	Commercially installed faucet or urinal valve that function using infrared sensor system.
Total Discharge Head	The total pressure or head the pump must develop. It is the sum of the depth to pumping level, elevation, service pressure, and friction loss.
Toxicity Test	Test to determine the toxicity of a chemical or an effluent using living organisms. It measures the degree of response of an exposed test organism to a specified chemical or effluent.
Transite Pipe	Pipe manufactured from asbestos and concrete, commonly found in water mains. Transom Panel a panel usually located above the door of an enclosure. It can be used to keep steam inside of a steam-shower unit. Some open to vent steam.
Trap	Curved section of drain line that prevents sewer odors from escaping into the atmosphere. All fixtures that have drains must have a ”P” trap installed. A toilet is the only plumbing fixture with an ”S” trap.
Trap Arm	The waste arm portion of a drainage trap.
Trap Dip	The U-bend portion of a drainage trap.
Trap Drain	A flex adapter to connect 1-1/2” to 1-1/2” drain pipe Trap Primer A small feeder line connecting the cold water line directly to the drainage trap, which releases a small amount of water to the trap should it run dry to maintain the water seal.
Trap Seal	Height of water in a toilet bowl ”at rest.”. It provides the water seal which prevents sewer gases from entering the home. It is measured from the top of the dam down to the inlet of the trapway. Also referred to as deep seal.
Trap Weir	See Crown Weir. An interior projection in the outlet side of a trap to aid in maintaining a water seal.
Trapway	Channel in a toilet that connects the bowl to the waste outlet. It is where the siphonic action takes place. The trapway is measured in terms of the largest diameter ball which can pass through it. Also called the passageway. Trim Any non-vitreous china toilet components, except the seat. Includes such items as ballcock, bolt caps, trip lever.
Trenchless	A system of installing or replacing underground infrastructure by pulling the lines through an existing pipe or a pilot hole, rather than laying pipe into long, pre-dug trenhches. More on Trenchless Services.
Trip Lever	Flush handle and actuating arm on a toilet tank. Also the lever that opens and closes the drain on the bathtub waste and overflow. Tube Talon Plastic hanger for mounting copper pipe.
Tube Valve	A valve which is opened or closed by mechanically moving a tube upstream or downstream by an actuating screw Tube Washer Replacement washer for one end of a closet tube.
Tuberculation	The process in which blister-like growths of metal oxides develop in pipes as a result of the corrosion of the pipe metal. Iron oxide tubercles often develop over pits in iron or steel pipe, and can seriously restrict the flow of water.
Turbulent Flow	Fluid flow in which the velocity at a given point varies erratically in magnitude and direction. Turbidity Water cloudiness caused by suspended particles.
Two-Piece Toilet	Toilet with a separate tank and bowl. Also referred to as a close-coupled toilet. Type ”L” Tube An industry standard for copper tubing defined by the tube wall thickness and identified by a ”blue” strip. Type ”L” copper tube wall is approximately 50% greater thickness than Type ”M.”
Type ‘M’ Tube	An industry standard for copper tubing defined by the tube wall thickness and identified by a ”red” stripe Tyseal Gasket Gasket for joining SV cast iron pipe into a hub.
UL	Underwriters Laboratories
ULF	Ultra Low Flush. Widely used description of 1.6 gpf or less toilets.
UNC	Unified National Coarse Thread. A standard kind of coarse straight thread used on fittings, nuts, and bolts. Not for pipes.
UNF	Unified National Fine Thread. A standard kind of fine straight thread used on fittings, buts, and bolts. Not for pipes.
USEPA	United States Environmental Protection Agency
USPHS	United States Public Health Service
Ultracoil	True double wall heat exchanger.
Uni-flex	One piece stop and riser combination. One-piece supply.
Uniformity Coefficient	A measure of the variation in particle sizes of ion exchange resins and filter media. It is defined as the ratio of the size of particle that has 60 percent of the material finer than itself, to the size of the particle that has 10 percent finer than itself.
Union	Three piece fitting that joins two sections of pipe, but allows them to be disconnected without cutting the pipe. Used primarily with steel pipe; never in a DWV system.
Universal Plumbing Code	A system of procedures designed to provide consumers with safe and sanitary plumbing systems and used throughout the United States by local jurisdictions.
Urinal	A plumbing fixture which receives only liquid body waste and conveys the waste through a trap seal into a gravity drainage system.
Urinal Strainers	Refers to a domed metal piece fastened to the bottom of an urinal to prevent debris from plugging the trapway of the unit.
Usable Storage	Percentage of hot water that can be drawn from a tank before the temperature drops to a point that it is no longer considered hot.
Utility Sink	Deep fixed basin, supplied with hot and cold water, which is used for rinsing of mops, disposal of cleaning water.
V-clip	A clip shaped like the letter ”V” used on a lavatory drain lift linkage assembly to easily adjust connection of the drain to the lift rod.
Vacuum Breaker	An anti-siphon device that prevents the backflow of contaminated water into the water supply system.
Valve	A device that regulates the flow of fluid.
Valve Dressing	Resurfacing a worn valve seat with a special tool. Stops leaks by providing a smooth sealing surface. Applies only to older compression style faucets.
Valve Seat	The non-moving part of a valve. Water flow is stopped when the moveable portion of the valve comes in contact with the valve seat.
Valve Seat Wrench	Hexagonal end wrench inserted into the hexagonal opening in a valve seat for installing or removal.
Vanity	A bathroom storage cabinet under the wash basin.
Velocity Head	The amount of energy required to accelerate water to a given velocity; expressed in feet per head.
Vent	A pipe that allows air into a drain system to balance the air pressure, preventing water in the traps from being siphoned off.
Vent Header	A vent pipe into which several vents connect. The vent pipe leads to the vent stack and out of the building.
Vent Stack	Upper portion of the soil stack above the topmost fixture through which gases and odors escape.
Venting Materials	Materials used for venting, i.e. PVC, CPVC, ABS, metal.
Venturi	A short tube with a tapered constriction in the middle that causes an increase in the velocity of flow of a fluid and a corresponding decrease in fluid pressure and that is used for creating a suction in a vacuum pump.
Viscosity	The resistance of fluids to flow, due to internal forces and friction between molecules, which increases as its temperature decreases.
Vitreous Surface	Material on some plumbing fixtures derived from or consisting of glass, translucent, and low on porosity.
Vitreous China	Ceramic materials fired at high temperature to form a non-porous body, having exposed surfaces coated with ceramic glaze fused to the body. This is used to form bathroom fixtures such as toilets, bidets, and lavs.
Volatile	Capable of vaporization at a relatively low temperature.
Volumetric	Refers to measurement by volume rather than weight.
Volute Casing	Derives is name from a spiral shaped casing surrounding the pump impeller. It converts velocity energy to pressure energy.
Voral Tube	Flexible steel hose used for hand-held shower sprays.
WC	Water Closet
WH	White finish on faucets.
Wall Thickness	The thickness of the tubing wall.
Wash-Down Water Closet	Water closet having a siphon trapway at the front of the bowl, and integral flushing rim.
Waste Arm Drain	An extension pipe, usually to extend a sink drain into a wall.
Waste & Overflow Drain	An assembly for a bathtub. The outlet at the top removes the overflow water during tub filling and the drain at the bottom removes wastewater when the tub is drained.
Waste Plug	Drain stopper on a bathtub drain
Waste Shoe	Bathtub drain assembly.
Waste Stack	See Soil Stack. The vertical main pipe in a drainage system, extending one or more stories.
Water Closet	A toilet.
Water Hammer	A loud banging noise caused by the hydraulic shock of suddenly shutting off a water supply, where water moves against the side of containing pipe or vessel.
Water Hammer Arrestor	A device installed near a fixture to absorb the hydraulic shock caused by a sudden shutoff of water.
Water Horse Power (WHP)	The calculated horse power produced by the pump using the formula WHP = head x gpm/3960.
Water Service Pipe	The pipe from the water main or other sources of potable water supply to the water-distributing system of the building served.
Water Spot	Water surface in the toilet bowl once the flush is completed.
Water Table	Level below the earth’s surface at which the ground becomes saturated with water.
Waterway Fitting	A channel through which water can flow; connects water heater to inlet and outlet lines.
Wave Washer	A washer, common in drain linkages, which provides pressure against a ball or other mechanism even when the opposing nut is not fully tightened.
Weak Well	Weak well application occurs when the pump lowers the water level in the well faster than the well can replenish itself.
Weir	A long notch with a horizontal edge, as in the top of a vertical plate or plank, through which water flows, used in measuring the quantity of flowing water.
Well Casing	A steel or plastic pipe inserted into a drilled well to prevent dirt and debris from contaminating the water.
Wellpoint	A pipe fitted with a driving point and a fine mesh screen used to remove underground water. A complete set of equipment for drying up ground including wellpoints, connecting pipes and pumps.
Wet Vent	Drain or waste pipe that also acts for one or more fixtures on the same line.
Whirlpool Tub	A bathtub with circulation jets in various spots throughout the tub that provide therapeutic massaging action.
Widespread	A style of bathroom lavatory faucet having separate spout and handles, usually 8” from center of handle to handle.
Working Pressure	Maximum pressure of the operating system permissible.
Working Water	Water used in a home for most general purposes including bathing and laundering.
Wrought Copper Fittings	Plumbing fittings used to connect copper tubes made of mechanically worked and toughened copper as opposed to an as-cast brittle copper.
Wye	A Y-shaped fitting with three openings used to create branch lines. Allows one pipe to be joined to another at a 45 degree angle.
XH	Extra Heavy
XL	Extra Large
XLG	Extra Long
XS	Extra Small
Yellow Tipping	A flame condition caused by too severe a reduction in primary air. The yellow color is caused by glowing carbon particles in the flame. It can be corrected by the injection of more primary air.
Yoke	Usually a brass casting that holds both the hot and cold valves and the mixing chamber for the water. May also refer to an assembly of copper or other metal which serves the same function.
Yoke Vent	A pipe connecting upward from a soil or waste stack to a vent stack for the purpose of preventing pressure changes in the stacks.
Zeolite	A group of hydrated sodium aluminosilicates, either natural or synthetic, with ion exchange properties.
Zero Soft	Water with a total hardness less than 1.0 grain per U.S. gallon, as calcium carbonate.
Zone of Aeration	The layer in the ground above the water table where the available voids are filled with air. Water falling on the ground percolates through this zone on its way to the aquifer.
Zone of Saturation	The layer in the ground in which all of the available voids are filled with water.

by PipeAdmin
Tags: acronyms, electrical, Electrician

Feb 8, 2018

Acronyms – Offshore

abbrev	define
A&G	Administrative And General Expenses
AADE	American Association Of Drilling Engineers
AAGR	Average Annual Growth Rate
AAPG	American Association Of Petroleum Geologists
AAQS	Ambient Air Quality Standards
AAR	After Action Reviews
AAV	Annulus Access Valve
ABAN	Abandonment
ABF	Aquatic Base Flow
ABS	American Bureau Of Shipping
ABSA	Alberta Boilers Safety Association
AC	Alternating Current
ACA	Annual Charge Adjustment
ACHE	Air Cooled Heat Exchanger
ACOU	Acoustic
ACP	Annular Casing Pressure
ACP	Area Contingency Plan
ACQU	Acquisition Log
ACRS	Accelerated Cost Recovery System
ADIOS	Automated Data Inquiry For Oil Spills
ADIT	Accumulated Deferred Income Taxes
ADROC	Advanced Rock Properties Report
ADT	Applied Drilling Technology
AF	Arctic Floater
AFE	Authorization For Expenditure
AFFF	Aqueous Film Forming Foam
AFP	Active Fire Protection
AFV	Annular Flow Valve
AGRU	Acid Gas Removal Unit
AHBDF	Along Hole (Depth) Below Derrick Floor
AHD	Along Hole Depth
AI	Artificial Island
AIChE	American Institute Of Chemical Engineers
AIME	American Institute Of Mining, Metallurgical, And Petroleum Engineers
AIRG	Airgun
AIRRE	Airgun Report
AIS	Automatic Identification System
AIT	Array Induction Tool
AIT	Auto Ignition Temperature
AIV	Alternate Isolation Valve
AL	Appraisal Licence
AL	Artificial Lift
ALARP	As Low As Reasonably Practicable
ALC	Aertical Seismic Profile Acoustic Log Calibration
ALR	Acoustic Log Report
AMDEA	Activated Methyldiethanolamine
AMNI	Associate Member Of The Nautical Institute
Amp	Ampere
AMS	Auxiliary Measurement Service Log
AMSL	Above Mean Sea Level
AMV	Annulus Master Valve
AMVER	US Automated Mutual Assistance Vessel Rescue
ANACO	Analysis Of Core Logs Report
ANARE	Analysis Report
ANP	Brazil’S National Petroleum Agency
ANPR	Advance Notice Of Proposed Rulemaking
ANSI	American National Standards Institute
AOF	Absolute Open Flow
AOFP	Absolute Open Flow Potential
AOPL	Association Of Oil Pipe Lines
APCD	Air Pollution Control District
APD	Application For Permit To Drill
API	American Petroleum Institute
APM	Application For Permit To Modify
APPRE	Appraisal Report
APS	Active Pipe Support
AQ	Air Quality
AQAP	Air Quality Attainment Plan
AQMD	Air Quality Management District
ARACL	Array Acoustic Log
ARB	Air Resources Board
ARCS	Admiralty Raster Chart Service
ARESV	Analysis Of Reservoir
ARI	Azimuthal Resistivity Image
ARPA	Automatic Radar Plotting Aids
ARRC	Array Acoustic Report
ART	Actuator Running Tool
ART	Alternate Response Technologies
AS	Array Sonic Processing Log
ASBA	Association Of Ship Brokers And Agents
ASCE	American Society Of Chemical Engineers
ASCSSV	Annulus Surface Controlled Sub Surface Valve
ASME	American Society Of Mechanical Engineers
ASP	Array Sonic Processing Report
ASPO	Asociation For The Study Of Peak Oil & Gas
ASR	Atmosphere Supplying Respirator
ASRO	Australian Shipping Registration Office
ASTM	American Society For Testing And Materials
ASV	Annular Safety Valve
ATD	Application To Drill
atm	Atmosphere, A Unit Of Pressure
AUV	Autonomous Underwater Vehicle
AV	Annular Velocity Or Apparent Viscosity
AVO	Amplitude Variation With Offset (Seismic)
AVO	Amplitude Versus Offset (Geophysics)
AWB/V	Annulus Wing Block/Valve (Xt)
AWO	Approval For Well Operation
BA	Brazos Area Gulf Of Mexico Leasing Area
BA	Bridging Agreement
BARS	Borehole Acoustic Reflection Survey
BAST	Best Available And Safest Technology
Bbbl	Billion Barrels
Bbl	Barrel(S) Of Oil
BBS	Behavioral Based Safety
BBSM	Behaviour Based Safety Management
BC	Code Of Safe Practice For Solid Bulk Cargoes
BCD	Barrels Per Calendar Day
Bcf	Billion Cubic Feet (Of Natural Gas)
Bcfd	Billion Cubic Feet Per Day
Bcfe	Billion Cubic Feet Of Gas Equivalent
BDF	Below Derrick Floor
BDI	Baltic Dry Index
BDL	Bit Data Log
BDV	Blow Down Valve
BFI	Baltic Freight Index
BFOE	Brent, Forties, Oseberg, And Ekofisk (Oil Fields)
BFPD	Barrels Of Fluid Per Day
BGL	Below Ground Level (Used As A Datum For Depths In A Well)
BGL	Borehole Geometry Log
BGS	British Geological Survey
BGT	Borehole Geometry Tool
BGWP	Base Of Ground Water Protection
BH	Bloodhound
BHA	Bottomhole Assembly
BHC	Bhc Gamma Ray Log
BHCA	Bhc Acoustic Log
BHCP	Bottomhole Circulating Pressure
BHCS	Bhc Sonic Log
BHCT	Bottomhole Circulating Temperature
BHFP	Bottomhole Flowing Pressure
BHL	Borehole Log
BHL	Bottomhole Location
BHP	Bottom Hole Pressure
BHPRP	Borehole Pressure Report
BHSRE	Bottom Hole Sampling Report
BHSS	Borehole Seismic Survey
BHST	Bottomhole Static Temperature
BHT	Bottomhole Temperature
BHTV	Borehole Television Report
BIMCO	Baltic And International Maritime Council
BIOR	Biostratigraphic Range Log
BIORE	Biostratigraphy Study Report
BIVDL	Bi/Dk/Wf/Casing Collar Locator/Gamma Ray Log
BLI	Bottom Of Logging Interval
BLP	Bridge Linked Platform
BLPD	Barrels Of Liquid Per Day
BM	Bay Marchand Area Gulf Of Mexico Leasing Area
BML	Below Mud Line
BMP’s	Best Management Practices
BO	Back Off Log
BO	Biological Opinion
BOB	Back On Bottom
BOD	Basis of Design
BOD	Biological Oxygen Demand
boe	Barrels Of Oil Equivalent
BOEM	US Bureau Of Ocean Energy Management
BOEPD	Barrels Of Oil Equivalent Per Day
boepd, boe/d, boed	Barrel Of Oil Equivalent Per Day
BOM	Bill Of Materials
BOP	Blowout Preventer
BOP	Bottom Of Pipe
BOPD	Barrels Of Oil Per Day
BOPE	Barrels Of Oil Per Day Equivalent
BOPE	Blowout Preventer Equipment
BOPM	Barrels Of Oil Per Month
BOREH	Borehole Seismic Analysis
BOSIET	Basic Offshore Safety Induction And Emergency Training
BOSVA	British Offshore Support Vessel Owners Association
BOTHL	Bottom Hole Locator Log
BOTTO	Bottom Hole Pressure/Temperature Report
BP	Boiling Point
BP	Bubble Point
bpd	Barrels Per Day
BPFL	Borehole Profile Log
BPH	Barrels Per Hour
BPI	Baltic Panamax Index
BPLUG	Baker Plug
BPV	Back Pressure Valve
BR	Barge
BROA	British Rig Owners Association
Brown Fields	Fields Beyond Their Production Plateau But Still Producing
BRPLG	Bridge Plug Log
BRS	Bulgarian Register Of Shipping
BRT	Below Rotary Table
BS	Breton Sound Area Gulf Of Mexico Leasing Area
BS&W	Basic Sediment & Water
BSDV	Boarding Shutdown Valve
BSEE	US Bureau Of Safety And Environmental Enforcement
BSL	Below Sea Level
BSL	Burner Safety Low
BSML	Below Sea Mean Level
BSR	Bend Strength Ratio
BSR	Blind Shear Ram
BSR	Blind Shear Rams (Blowout Preventer)
BSR	Bottom Simulating Reflector
BTEX	Benzene, Toluene, Ethylbenzene, Xylene
BTHL	Bottom Hole Log
BTI	British Trade International
BTO/C	Break To Open/Close (Valve Torque)
BTU	British Thermal Unit
BU	Bottom Up
BUL	Bottom Up Lag
BUR	Build Up Rate
BV	Bureau Veritas
BVO	Ball Valve Operator
BWOC	By Weight Of Cement
BWOW	By Weight Of Water
BWPD	Barrels Of Water Per Day
C (cent.)	Centigrade
C&E	Well Completion And Equipment Cost
C&K	Choke And Kill
C&S	Cased And Suspended
C/P	Consumption/Production (Ratio)
C1	Methane
C2	Ethane
C3	Propane
C4	Butane
C6	Hexanes
C7+	Heavy Hydrocarbon Components
CA	Core Analysis Log
CAA	Clean Air Act
CAAA	Clean Air Act Amendments
CAD	Computer Assisted Design
CAER	Community Awareness And Emergency Response
CALI	Calliper Log
CALOG	Circumferential Acoustic Log
CALVE	Calibrated Velocity Log Data
CAODC	Canadian Association Of Oilwell Drilling Contractors
CAP	Condition Assessment Program Survey
CAPEX	Capital Expenditure
CAPP	Canadian Association Of Petroleum Producers
CART	Cam Actuated Running Tool (Housing Running Tool)
CART	Cap Replacement Tool
CAS	Casing Log
CATS	Central Area Transmission System
CB	Core Barrel
CBI	Computer Based Information
CBI	Confederation Of British Industry
CBIL	Cbil Log
CBL	Cement Bond Log
CBM	Choke Bridge Module
CBM	Coalbed Methane
CBM	Coalbed Methane
CBM	Conventional Buoy Mooring
CBT	Computer Based Training
CCA	Clean Carribbean & Americas
CCC	Carrier Container Council
CCHT	Core Chart Log
CCL	Casing Collar Locator
CCLP	Casing Collar Locator Perforation
CCLTP	Casing Collar Locator Through Tubing Plug
CCP	Controllable Pitch Propeller
CCS	Carbon Capture And Storage (Or Sequestration)
CCS	China Classification Society
CD	Core Description
CDA	Common Data Access
CDATA	Core Data
CDIS	Cdi Synthetic Seismic Log
CDP	Common Depth Point (Geophysics)
CDP	Comprehensive Drilling Plan
CDR	Chemical Data Reporting Rule
CDRCL	Compensated Dual Resistivity Cal. Log
CDU	Control Distribution Unit
CECAN	Cec Analysis
CEME	Cement Evaluation
CEN	European Committee For Standardization
CENELEC	European Committee For Electro Technical Standardization
CEPA	Canadian Energy Pipeline Association
CERCLA	US Comprehensive Environmental Response Compensation And Liability Act
CERE	Cement Remedial Log
CES	Coast Earth Station
CESMA	Confederation Of European Union Shipmasters Associations
CET	Cement Evaluation Tool
CF	Completion Fluid
Cf	Cubic Feet
CFD	Computational Fluid Dynamics
CFR	Code Of Federal Regulations
Cfs	Cubic Feet Per Second
CG	Center of Gravity
CG	Coast Guard
CGBF	Concrete, Gravity Based Structure
CGL	Core Gamma Log
CGPH	Core Graph Log
CGR	Condensate Gas Ratio
CGT	Capital Gains Tax
CGTL	Compact Gas To Liquids
CH	Cased Hole
CH	Charlotte Harbor Gulf Of Mexico Leasing Area
CHCNC	Chcnc Gamma Ray Casing Collar Locator
CHDTP	Calliper Hdt Playback Log
CHECK	Checkshot And Acoustic Calibration Report
CHESM	Contractor, Health, Environment And Safety Management
CHKSR	Checkshot Survey Report
CHKSS	Checkshot Survey Log
CHOPS	Cold Heavy Oil Production With Sand
CHP	Casing Hanger Pressure
CHROM	Chromatolog
CHRT	Casing Hanger Running Tool
CIBP	Cast Iron Bridge Plug
CILD	Conduction Log
CIMV	Chemical Injection Metering Valve
CIRM	International Radio Maritime Committee
CIT	Chartered Institute Of Transport
CITHP	Closed In Tubing Head Pressure (Tubing Head Pressure When The Well Is Shut In)
CIV	Chemical Injection Valve
CL	Core Log
Class	Category In Classification Register
CLC	International Convention On Civil Liability For Oil Pollution Damage
CLG	Core Log And Graph
CLUP	Coastal Land Use Plan
CM	Choke Module
CMP	Coastal Management Program
CMP	Common Midpoint (Geophysics)
CNCF	Field Normalised Compensated Neutron Porosity
CND	Compensated Neutron Density
CNFDP	Cnfd True Vertical Depth Playback Log
CNG	Compressed Natural Gas
CNGR	Compensated Neutron Gamma Ray Log
CNL	Compensated Neutron Log
CNLFD	Cnl/Fdc Log
CO	Carbon Monoxide
CO	Change Out
CO2	Carbon Dioxide
COA	Contract Of Affreightment
COC	Certificate Of Conformance
COD	Chemical Oxygen Demand
COFR	Certificate Of Financial Responsibility
COL	Collar Log
Colreg	International Convention On Collision Regulations
COMAN	Compositional Analysis
COML	Compaction Log
COMP	Composite Log
COMPR	Completion Program Report
COMPU	Computest Report
COMRE	Completion Record Log
CONDE	Condensate Analysis Report
CONDR	Continuous Directional Log
COOGER	California Offshore Oil And Gas Energy Resources
CORAN	Core Analysis Report
CORE	Core Report
CORG	Corgun Log
CORIB	Coriband Log
CORLG	Correlation Log
COROR	Core Orientation Report
COS	Center For Offshore Safety
CoSWP	Code Of Safe Working Practices For Merchant Seamen
COTP	Captain Of The Port
COW	Crude Oil Washing
COXY	Carbon/Oxygen Log
CPI	Chemical Process Industries
CPI	Consumer Price Index
CPI	Cpi Log (Computer Processed Interpretation)
CPI separator	Corrugated Plate Interceptor
CPICB	Cpi Coriband Log
CPIRE	Cpi Report
CPS	Cycles Per Second
CPU	Cavern Point Unit
CRA	Corrosion Resistant Alloy
CRET	Cement Retainer Setting Log
CRP	Common/Central Reference Point (Subsea Survey)
CRP	Control Riser Platform
CRS	Croatian Register Of Shipping
CRT	Clamp Replacement Tool
CS	Chandeleur Sound Gulf Of Mexico Leasing Area
CsF	Caesium Formate
csg	Casing
CSHN	Cased Hole Neutron Log
CSI	Csi Log
CSMT	Core Sampler Tester Log
CSO	Complete Seal Off
CSPG	Canadian Society Of Petroleum Geologists
CSS	Code Of Ship Management Standards
CSS	Cyclic Steam Stimulation (Method)
CSTAK	Core Sample Taken Log
CSUG	Canadian Society For Unconventional Gas
CT	Coiled Tubing
CT	Complex Total
CT	Compliant Tower
CT	Corporation Tax
CTCO	Coiled Tubing Clean Out
CTD	Coiled Tubing Drilling
CTLF	Coil Tubing Lift Frame
CTLF	Compensated Tension Lift Frame
CTM	Coil Tubing Measurement
CTOD	Crack Tip Opening Displacement
CTRAC	Cement Tracer Log
CTU	Cargo Transport Unit
CTU	Coiled Tubing Unit
CUP	Conditional Use Permit
CUT	Cutter Log
CUTTD	Cuttings Description Report
CWA	Clean Water Act
CWI	Certified Welding Inspector
CWOP	Complete Well On Paper
CWOR	Completion Work Over Riser
CYBD	Cyberbond Log
CYBLK	Cyberlook Log
CYDIP	Cyberdip Log
CYDN	Cyberdon Log
CYPRO	Cyberproducts Log
CZMA	US Coastal Zone Management Act
CZMP	Coastal Zone Management Program
D	Day
D&C	Drilling And Completions
DAC	Dipole Acoustic Log
DARCI	Darci Log
DART	Days Away, Restricted Work, Or Job Transfer
DAT	Wellhead Housing Drill Ahead Tool
DAZD	Dip And Azimuth Display
dBA	Decibles
DBB	Double Block And Bleed
DC	Desoto Canyon Gulf Of Mexico Leasing Area
DC	Direct Current
DC	Drill Centre
DC	Drill Collar(S)
DCAL	Dual Caliper Log
DCP	Driller’S Control Panel
DD	Directional Driller Or Directional Drilling
DD	Dustin Dome Gulf Of Mexico Leasing Area
DDBHC	Ddbhc Waveform Log
DDET	Depth Determination Log
DDM	Derrick Drilling Machine (A.K.A. Top Drive)
DDNL	Dual Det. Neutron Life Log
DDPT	Drill Data Plot Log
DEAL	Digital Energy Atlas & Library
DECC	Department For Energy And Climate Change (Uk)
DECT	Decay Time
DEFSU	Definitive Survey Report
DELTA	Delta T Log
Delta	Difference Between Plan And Performance
DEN	Density Log
DEPAN	Deposit Analysis Report
DEPC	Depth Control Log
DESFL	Deep Induction Sfl Log
DEV	Development Well, Lahee Classification
DEVLG	Deviation Log
DEXP	D Exponent Log
DF	Derrick Floor
DFR	Drilling Factual Report
DFT	Dry Film Thickness
DGP	Dynamic Geohistory Plot (3D Technique)
DGPS	Differential Global Positioning System
DH	Drilling History
DHC	Depositional History Curve
DHPTT	Downhole Pressure/Temperature Transducer
DHSV	Downhole Safety Valve
DIBHC	Dis Bhc Log
DIEGR	Dielectric Gamma Ray Log
DIF	Drill In Fluids
DIL	Dual Induction Log
DILB	Dual Induction Bhc Log
DILL	Dual Induction Laterolog
DILLS	Dual Induction Log Lss
DILSL	Dual Induction Log Sls
DIM	Directional Inertia Mechanism
DINT	Dip Interpretation
DIP	Dipmeter Log
DIPAR	Dipole Acoustic Report
DIPBH	Dipmeter Borehole Log
DIPFT	Dipmeter Fast Log
DIPLP	Dip Lithology Pressure Log
DIPRE	Dipmeter Report
DIPRM	Dip Removal Log
DIPSA	Dipmeter Soda Log
DIPSK	Dipmeter Stick Log
DIRS	Directional Survey Log
DIRSU	Directional Survey Report
DIS	Draft International Standard
DISFL	Disfl Dbhc Gamma Ray Log
DISO	Dual Induction Sonic Log
DL	Development Licence
DLat	Difference In Latitude
DLIST	Dip List Log
DLL	Dual Laterolog
DLong	Difference In Longitude
DLS	Dogleg Severity
DLT	Digital Linear Tape
DMA	Dead Man Anchor
DMDO	Distillate Marine Diesel Oil
DMR	Discharge Monitoring Report
DNC	Digital Nautical Chart
DNHO	Downhole Logging
DNV	Det Norske Veritas
DO	Dissolved Oxygen
DO	Division Order
DOA	Delegation Of Authority
DOC	Document Of Compliance
DOCD	Development Operations Coordination Documents
DOE	US Department Of Energy
DOI	US Department Of Interior
DOL	US Department Of Labor
DOO	Designation Of Operator
DOT	US Department Of Transportation
DOWRE	Downhole Report
dP	Delta Pressure
DP	Dewpoint
DP	Drill Pipe
DP	Dynamic Positioning
DPDV	Dynamically Positioned Drilling Vessel
DPL	Dual Propagation Log
DPLD	Differential Pressure Levitated Device (Or Vehicle)
DPO	Dynamic Positioning Operator
DPP	Development And Production Plan
DPRES	Dual Propagation Resistivity Log
DPS	Dynamic Positioning System
DPT	Deeper Pool Test, Lahee Classification
DQLC	Dipmeter Quality Control Log
DR	Dead Reckoning
DR	Delay Rental
DR	Drilling Report
DR	Dummy Run Log
DRI	Drift Log
DRLCT	Drilling Chart
DRLOG	Drilling Log
DRLPR	Drilling Proposal/Progress Report
DRPG	Drilling Program Report
DRPRS	Drilling Pressure
DRREP	Drilling Report
DRYRE	Drying Report
DS	Deviation Survey, (Also Directional System)
DS	Drillship
DSC	Dangerous Goods, Solid Cargoes And Containers
DSCAN	Dsc Analysis Report
DSI	Dipole Shear Imager
DSPT	Cross Plots Log
DSS	Decision Support System
DST	Drill Stem Test
DSTG	Dstg Log
DSTL	Drill Stem Test Log
DSTND	Dual Space Thermal Neutron Density Log
DSTPB	Drill Stem Test True Vertical Depth Playback Log
DSTRE	Drill Stem Test Report
DSTSM	Drill Stem Test Summary Report
DSTW	Drill Stem Test Job Report/Works
DSV	Diving Support Vessel
DT	Day Tortugas Gulf Of Mexico Leasing Area
DTPB	Cnt True Vertical Depth Playback Log
DTT	Depth To Time
DW	Deep Water
DWH	Deepwater Horizon
DWOP	Deepwater Operations Plan
DWOP	Drilling Well On Paper
DWQL	Dual Water Quicklook Log
DWRRA	US Deep Water Royalty Relief Act
DWSS	Dig Well Seismic Surface Log
DWT	Deadweight Tons
DXC	Dxc Pressure Pilot Report
E	Young’S Modulus
E&A	Exploration And Appraisal
E&P	Exploration And Production
E/W	East/West
EA	Environmental Assessment
EA	Environmental Assessment
EAGE	European Association Of Geoscientists & Engineers
EBITDA	Earnings Before Interest, Taxes, Depreciation, And Amortization
EC	European Commission
ECC	Emergency Control Center
ECD	Equivalent Circulating Density
ECDIS	Electronic Chart Display And Information System
ECGD	Exports Credits Guarantee Department
ECHA	European Chemicals Agency
ECITB	Engineering Construction Industry Training Board
ECP	External Casing Packer
ECRD	Electrically Controlled Release Tool
ECS	Electronic Chart System
EDP	Emergency Disconnect Package
EDP	Exploration Drilling Program Report
EDR	Exploration Drilling Report
EDRC	Effective Daily Recovery Capacity (Of Oil Skimmers)
EDS	Emergency Disconnect Sequence
EEHA	Electrical Equipment In Hazardous Areas
EEP	Emergency Evacuation Plan
EER	Emergency Escape And Refuge (System)
EERA	Escape, Evacuation, And Rescue Analysis
EEZ	Exclusive Economic Zone
EFH	Essential Fish Habitat
EFL	Electrical Flying Lead
EFR	Engineering Factual Report
EGMBE	Ethylene Glycol Mono Butyl Ether
EHT	Electric Heat Trace
EHV	Extra High Voltage
EI	Eugene Island Area Gulf Of Mexico Leasing Area
EIA	Environmental Impact Assessment
EIA	Environmental Impact Assessment
EIA	US Energy Information Administration
EIR	Environmental Impact Report
EIS	Environmental Impact Statement
EL	Electric Log
EL	Exploration Licence
EL	The Elbow Gulf Of Mexico Leasing Area
ELT	Economic Limit Test
EM	Electromagnetic
EM	Emop Log
EMF	Electro Magnetic Fields
EMG	Equivalent Mud Gradient
EMI	Electromagnetic Inspection
EMOP	Emop Well Site Processing Log
EMP	Electromagnetic Propagation Log
EMT	Electrical Metallic Tubing (Conduit)
EMW	Equivalent Mud Weight
EN	European Standard
EN PI	Enhanced Productivity Index Log
ENC	Electronic Navigation Chart
ENG	Engineering Log
ENGF	Engineer Factual Report
ENGPD	Engineering Porosity Data
Eni	Ente Nazionale Idrocarburi S.P.A. (Italy)
ENJ	Enerjet Log
EOFL	End Of Field Life
EOR	Enhanced Oil Recovery
EOS	Equation Of State
EOT	End Of Tubing
EOW	End Of Well Report
EP	Exploration Plan
EPA	Environmental Protection Act
EPA	US Environmental Protection Agency
EPCI	Engineering, Procurement, Construction, And Installation
EPCU	Electrical Power Conditioning Unit
EPFS	Electronic Position Fixing System
EPIDORIS	Exploration And Production Integrated Drilling Operations And Reservoir Information System
EPIRB	Emergency Position Indicating Radio Beacon
FINTP	Formation Interpretation
FIP	Flow Induced Pulsation
FIR	Failure Investigation Reports
FIT	Fairing Intervention Tool
FIT	Fluid Identification Test
FIT	Formation Integrity Test
FIT	Formation Integrity Test
FIT	Formation Interval Tester
FIV	Flow Induced Vibration
FIV	Formation Isolation Valve
FLAP	Fluid Level Above Pump
FLET	Flowline End Termination
FLIV	Flowline Isolation Valve
FLMPI	Full Length Magnetic Particle Inspection
FLMT	Flowline Manifold Termination
FLOPR	Flow Profile Report
FLOT	Flying Lead Orientation Tool
FLOW	Flow And Buildup Test Report
FLRA	Field Level Risk Assessment
FLS	Fluid Sample
FLT	Fault (Geology)
FLUT	Full Length Ultrasonic Inspection
FM	Flowmeter
FMA	Finnish Maritime Administration
FMEA	Failure Modes And Effects Analysis
FMECA	Failure Modes, Effects, And Criticality Analysis
FMI	Formation Micro Imaging Log
FMP	Facility Measurement Point
FMP	Formation Microscan Report
FMS	Formation Multi Scan Log; Formation Micro Scan Log
FNL	From North Line
FNOS	Final Notice Of Sale
FO	Fuel Oil
FOET	Further Offshore Emergency Training
FOIP	Freedom Of Information And Protection Of Privacy Act
FONSI	Findings Of No Significant Impact
FOSC	Federal On Scene Coordinator
FOSV	Full Opening Safety Valve
FP	Frac Pack
FPDM	Fracture Potential And Domain Modelling/Mapping
FPF	Floating Production Facility
FPIT	Free Point Indicator Tool
FPL	Flow Analysis Log
FPLAN	Field Plan Log
FPS	Floating Production System
FPSO	Floating Production Storage And Offloading System
FPU	Floating Processing Unit
FR	Full Requirements
FR	US Federal Register
FRA	Fracture Log
FRARE	Fracture Report
FRES	Final Reserve Report
FRSB	Fast Response Spill Boat
FRU	Fast Response Units
FS	Fail Safe
FSA	Formal Safety Assessment
FSB	Flowline Support Base
FSI	Flawless Start Up Initiative
FSL	From South Line
FSO	Floating Storage Offloading Vessel
FSRU	Floating Storage And Regasification Unit
FT	Flow Transmitter
Ft	Foot (Feet)
FT	Formation Tester Log
FTA	Fault Tree Analysis
FTC	US Federal Trade Commission
FTM	Fire Team Member
FTP	Flowing Tubing Plug
FTP	Flowing Tubing Pressure
FTRE	Formation Testing Report
FULDI	Full Diameter Study Report
FV	Funnel Viscosity Or Float Valve
FVF	Formation Volume Factor
FWHP	Flowing Wellhead Pressure
FWKO	Free Water Knock Out
FWL	Free Water Level
FWL	From West Line
FWR	Final Well Report
FWV	Flow Wing Valve
G&G	Geology And Geophysics
G/C	Gas Condensate
G/L	Gas/Liquid
GA	General Arrangement (Of Offshore Equipment)
Gal	Gallon
GAPP	Generally Accepted Accounting Principles
GAS	Gas Log
GASAN	Gas Analysis Report
GBS	Gravity Based Structure
GBT	Gravity Base Tank
GC	Gas Chromatography
GC/MS	Gas Chromatography/Mass Spectrometry
GCAT	Government Compliance Action Team
GCLOG	Graphic Core Log
GDAT	Geodetic Datum
GDIP	Geodip Log
GDP	Gross Domestic Product
GDT	Gas Down To
GE	Condensate Gas Equivalent
GE	Ground Elevation
GEOCH	Geochemical Evaluation
GEODY	Geo Dys Log
GEOEV	Geochemical Evaluation Report
GEOFO	Geological & Formation Evaluation Report
GEOL	Geological Surveillance Log
GEOP	Geophone Data Log
GEOPN	Geological Well Prognosis Report
GEOPR	Geological Operations Progress Report
GEORE	Geological Report
GFCI	Ground Fault Circuit Interrupter
GGRG	Gauge Ring
GHG	Greenhouse Gas
GIIP	Gas Initially In Place
GIS	Geographic Information System
GJ	Gigajoule
GL	Gas Lift
GL	Germanischer Lloyd
GL	Ground Level
GLM	Gas Lift Mandrel
Glonass	Global Navigation Satellite System
GLR	Gas Liquid Ratio
GLV	Gas Lift Valve
GMDSS	Global Maritime Distress And Safety System
GMT	Greenwich Mean Time
GNOME	General NOAA Oil Modeling Environment
GOC	Gas Oil Contact
GOC	General Operators’ Certificate
GOM	Gulf Of Mexico
GOMR	Gulf Of Mexico Region
GOP	Geological Operations Report
GOR	Gas Oil Ratio
GOSP	Gas Oil Separation Plant
GP	Gravel Pack
GPIT	Inclinometry Tool Log
GPLT	Geol Plot Log
GPRA	The US Government Performance And Results Act
GPS	Global Positioning System
GPSL	Geo Pressure Log
GR	Gamma Ray
GR	Ground Level
GRAD	Gradiometer Log
GRC	Galvanized Rigid Conduit
GRE	Ground Elevation
GRLOG	Grapholog
GRN	Gamma Ray Neutron Log
GRP	Glass Reinforced Plastic
GRSVY	Gradient Survey Log
GRV	Gross Rock Volume
GS	Gas Supplier
GS	Gel Strength
GT	Gross Tonnage
GT&C	General Terms And Conditions
GTL	Gas To Liquids
GTW	Gas To Wire
GUI	Graphical User Interface
GUN	Gun Set Log
GW	Gigawatt
GWC	Gas Water Contact
Gwh	Gigawatt Hour
GWI	Gross Working Interest
GWREP	Geo Well Report
H2S	Hydrogen Sulfide
HA	Hazard Analysis
HAP’s	Hazardous Air Pollutants
HARP	Hot Spots Analysis And Reporting Program
HARP	Hydrocarbons Additional Recovery Program
HAZ	Heat Affected Zone
HAZCOM	Hazard Communications
HAZID	Hazard Identification
HAZMAT	Hazardous Materials Response Division Of Noaa
HAZOP	Hazard And Operability (Analysis)
HAZWOPER	Hazardous Waste Operations And Emergency Response
HBL	Hydrostatic Balanced Loading
HC	Hydrocarbons
HCA	High Consequence Areas
HCA	Host Control Area
HCCS	Horizontal Clamp Connection System
HCM	Horizontal Connection Module
HCRF	Hydrographic Chart Raster Format
HDA	Helideck Assistant
HDT	High Resolution Dipmeter Log
HEA	Habitat Equivalency Analysis
Heavy oil	Crude Oil With Api Gravity Of 20 Or Less
HEC	Hydroxyethylcellulose
HEP	Habitat Evaluation Procedure
HES	Health, Environment, And Safety
HEXT	Hex Diplog
HFE	Human Factors Engineering
HFL	Hydraulic Flying Lead
HGE	Harmonization Group On Ecdis
HGS	High (Specific )Gravity Solids
HHI	Hirschman Herfindahl Index
HHP	High Holding Power (Anchors)
HHP	Hydraulic Horsepower
HIPPS	High Integrity Pressure Protection System
HISC	Hydrogen Induced Stress Cracking
HKSR	Hong Kong Shipping Register
HL	Hook Load
HLID	Hydrocarbon Leak And Ignition Database
HLO	Heavy Load Out (Facility)
HLO	Helicopter Landing Officer
Hmax	Maximum Wave Height
HO	Hydrographic Office
HP	High Pressure
HP	Horsepower
HP	Hydrostatic Pressure
HP/IP	High Pressure And/Or Intermediate Pressure
HPGAG	High Pressure Gauge
HPHT	High Pressure, High Temperature
HPU	Hydraulic Power Unit
HPWBM	High Performance Water Base Mud
HQI	Habitat Quality Index
Hs	Significant Wave Height
HSC	Health & Safety Commission
HSE	Health, Safety And Environment
HSWA	Health And Safety At Work Act
HT	High Temperature
HTHP	High Temperature, High Pressure
HTM	Heideck Team Member
HUD	Hold Up Depth
HUET	Helicopter Underwater Escape Training
HVDC	High Voltage Direct Current
HVI	High Viscosity Index
HWDP	Heavy Weight Drill Pipe
HYPJ	Hyperjet
HYROP	Hydrophone Log
Hz	Hertz (Cycles Per Second)
I3P	Independent Third Party
IACS	International Association Of Classification Societies
IADC	International Association Of Drilling Contractors
IAIN	International Association Of Institutes Of Navigation
IALA	International Association Of Lighthouse Authorities
IAPH	International Association Of Ports And Harbors
IASST	International Association For Sea Survival Training
IBC	Intermediate Bulk Container
IBCS	Integrated Bridge Control System
IBIA	International Bunker Industry Association
IBOP	Inside Blowout Preventer
IC	Incident Commander
IC	Information Collection
ICAB	International Cargo Advisory Bureau
ICAP	Installed Capacity
ICD	Inflow Control Device
ICE	Intercontinental Exchange
ICHCA	International Cargo Handling Coordination Association
ICoTA	Intervention And Coiled Tubing Association
ICP	Intermediate Casing Point
ICS	Incident Command System
ICS	Institute Of Chartered Shipbrokers
ICS	International Chamber Of Shipping
ICSU	Integrated Commissioning And Start Up
ICV	Integrated Cement Volume
ICV	Interval Control Valve
ID	Inner Diameter
IDC	Intangible Drilling Costs
IDLH	Immediately Dangerous To Life Or Health
IEA	International Energy Agency
IEEE	Institute Of Electrical And Electronics Engineers
IEL	Induction Electrical Log
IEP	Initial Exploration Plan
IEP/DOCD	IEP and Development Operations Coordination Documents
IER	Incremental Energy Rate
IF	Internal Flush Tool Joint
IFO	Intermediate Fuel Oil
IFSMA	International Federation Of Ship Masters’ Associations
IFTPA	International Forest Product Transport Association
IGO	Inter Governmental Organization
IGS	Inert Gas System
IGU	International Gas Union
IHB	International Hydrographic Bureau
IHMA	International Harbor Masters’ Association
IHO	International Hydrographic Organization
IHR	Incremental Heat Rate
IHV	Integrated Hole Volume
IICL	Institute Of International Container Lessors
IIMS	International Institute Of Marine Surveyors
IIRT	Initial Incident Response Team
IJC	International Joint Commission
IJL	Injection Log
IL	Induction Log
ILI	In Line Inspection
ILO	International Labor Organization
ILOGS	Image Logs
ILTA	International Liquid Terminals Association
IMAG	Image Analysis Report
IMarE	Institute Of Marine Engineers
IMB	International Maritime Bureau
IMCA	International Marine Contractors Association
IMDG Code	International Maritime Dangerous Goods Code
IMF	International Monetary Fund
IMLA	International Maritime Lecturers Association
IMO	International Maritime Organization
IMPA	International Marine Purchasing Association
IMPA	International Maritime Pilots’ Association
IMT	Intermediate Metal Conduit
in	Inch
INC	Incident Of Non Compliance
INCRE	Incline Report
INDWE	Individual Well Record Report
INGAA	Interstate Natural Gas Association Of America
INJEC	Injection Falloff Log
Inmarsat	International Marine Satellite Organization
INSUR	Inrun Survey Report
Intercargo	International Association Fo Dry Cargo Ship Owners
INTERTANKO	International Association Of Independent Tanker Owners
INVES	Investigative Program Report
IOC	Independent Oil Company
IOC	International Oil Company
IOLT	Institute Of Logistics And Transport
IOPC	International Oil Pollution Fund
IOR	Improved Oil Recovery
IP	Intellectual Property
IP	Intermediate Pressure
IP	Internet Protocol
IPAA	Independent Petroleum Association Of America
IPC	Installed Production Capacity
IPE	International Petroleum Exchange
IPF	Impact Producing Factors
IPO	Initial Public Offering
IPPC	Integrated Pollution Prevention And Control
IPR	Inflow Performance Relationship
IR	Inland Revenue
IR	Inspection Report
IR	Interpretation Report
IRC	Inspection Release Certificate
IRS	Indian Register Of Shipping
ISDP	Integrated Ship Design And Production
ISF	International Shipping Federation
ISGOTT	International Safety Guide For Oil Tankers And Terminals
ISM	IMO’S International Safety Management (Code)
ISMA	International Ship Managers’ Association
ISO	International Standards Organization
ISSA	International Ship Supplies Association
ISU	International Salvage Union
ITB	Invitation to Bid
ITF	International Transport Workers Federation
ITL	Industry Leadership Team (Part Of Pilot)
ITOPF	International Tanker Owners Pollution Federation
ITP	Inspection And Test Plan
ITS	Influx To Surface
ITT	Invitation To Tender
IUA	International Underwriting Association
IUR	Inventory Update Reporting
IWCF	International Well Control Federation
IWCF	International Well Control Forum
IWCF certification	IWCF Blowout Prevention & Well Control Certification
IWOCS	Installation/Workover Control System
J&A	Junked And Abandoned
JAS	Joint Association Survey
JB	Junk Basket
JHA	Job Hazard Analysis
JIP	Joint Industry Project
JIT	Just In Time
JITF	Joint Industry Task Force
JNCC	Joint Nature Conservation Committee
JOA	Joint Operating Agreement
JRP	Joint Review Panel
JSA	Job Safety Analysis
JT	Joule Thomson (Effect/Valve/Separator)
JU	Jack Up Drilling Rig
JU	Jackup
JV	Joint Venture
JVP	Joint Venture Partners/Participants
KB	Kelly Bushing
KBE	Kelly Bushing Elevation
KBG	Kelly Bushing Height Above Ground Level
KD	Kelly Down
kh	Permeability Thickness (K Permeability, H Height)
kHz	Thousand Hertz (Cycles Per Second)
KOP	Kick Off Plug
KOP	Kick Off Point Directional Drilling
KOP	Kickoff Point
KPI	Key Performance Indicator
kpsi	Thousand Pounds Per Square Inch
KR (or KRS)	Korean Register Of Shipping
KRP	Kill Rate Pressure
KV	Kilovolt
KVA	Kilovolt Ampere
KVNR	Dutch Register Of Shipping
Kw	Kilowatt
KWH	Kilowatt Hour
LACT	Lease Automatic Custody Transfer
LAH	Lookahead
LAOT	Linear Activation Override Tool
LARS	Launch & Recovery System
Lat	Latitude
LAT	Lowest Astronomical Tide
lbf	Pounds Force
lbm	Pounds Mass
LBP	Length Between Perpendiculars
LBS	Lifeboat Stations
LCB	Longitudinal Centre Of Buoyancy
LCD	Liquid Crystal Display
LCF	Longitudinal Centre Of Flotation
LCL	Lethal Dose (Low)
LCM	Lost Circulation Material
LCV	Level Control Valve
LD	Lay Down (Tubing, Rods, Etc.)
LD50	Median Lethal Dose
LDT	Light Displacement Tonnage, Lost During Trans Shipment
LEAKL	Leak Detection Log
LED	Light Emitting Diode
LEEA	Lifting Equipment Engineers Association
LEL	Lower Explosive Limit
LEM	Lower Explosive Mixture
LEO	Low Earth Orbit (Satellite Configuration)
LFL	Lower Flammable Limit
LGR	Liquid Gas Ratio
LGS	Low (Specific )Gravity Solids
LIBOR	London Interbank Offered Rate
LIFT	Licence Information For Trading
LINCO	Liner And Completion Progress Report
LIOG	Lithography Log
LIT	Lead Impression Tool
LKO	Lowest Known Oil
LL	Laterolog
LMAP	Location Map
LMRP	Lower Marine Riser Package
LMT	Local Mean Time
LMV	Lower Master Valve
LN	Land
LNG	Liquefied Natural Gas
LO	Lubricating Oil
LOA	Length Over All
LOA	Letter Of Authorisation/Agreement
LOC	Letter Of Credit, Letter Of Compliance
LODF	Line Outage Distribution Factor
LOE	Lease Operating Expenses
LOGGN	Logging Whilst Drilling
LOGGS	Lincolnshire Offshore Gas Gathering System
LOGIC	Leading Oil And Gas Industry Competitiveness
LOGRS	Log Restoration Report
LOGSM	Log Sample
LOL	Limitation Of Owner’S Liability
LOLE	Loss Of Load Expectation
LOLER	Lifting Operations And Lifting Equipment Regulations
LOP	Line Of Position
LOPA	Layers Of Protection Analysis
LOR	Letter Of Readiness
LOS	Law Of The Sea
LOS	Line Of Sight
LOT	Leak Off Test
LOT	Linear Override Tool
LOT	Lock Open Tool
LOTO	Lock Out Tag Out
LP	Limited Partnership
LP	Liquid Petroleum
LP	Low Pressure
LPC	London Processing Centre
LPG	Liquefied Petroleum Gas
LPH	Litres Per Hour
LPWHH	Low Pressure Well Head Housing
LQ	Living Quarters
LR	Lloyd’S Register
LRDP	Long Range Development Plan
LRP	Lower Riser Package
LSA	Life Saving Appliances
LSBGR	Long Spacing Bhc Gr Log
LSD	Land Surface Datum
LSFO	Loss Sulfur Fuel Oil
LSH	Level Safety High (Sensor)
LSL	Level Safety Low (Sensor)
LSSON	Long Spacing Sonic Log
LST	Local Standard Time
LT	Linear Time Or Lag Time
LTI(FR)	Lost Time Incident (Frequency Rate)
LUMI	Luminescence Log
LVEL	Linear Velocity Log
LVI	Low Viscosity Index
LVOT	Linear Valve Override Tool
LW	Low Water
LWD	Logging While Drilling
LWL	Length On Water Line
LWOP	Logging Well On Paper
LWR	Lazy Wave Catenary Riser
m	Metre
M&R	Measurement And Regulation
M/V	Mobile Vessel
MAASP	Maximum Acceptable [Or Allowable] Annular Surface Pressure
MAC	Multipole Acoustic Log
MACL	Multiarm Caliper Log
MAGST	Magnetostratigraphic Report
MAOP	Maximum Allowable Operating Pressure
MARA	Maralog
Marisat	Maritime Satellite System
MARPOL	International Convention For The Prevention Of Pollution From Ships
MARSEC	Maritime Security
MASP	Maximum Allowable Surface Pressure
MASP	Maximum Anticipated Surface Pressure
MASPcc	Maximum Anticipated Surface Pressure For The Completion Case
MAWOP	Maximum Allowable Wellhead Operating Pressure
MAWP	Maximum Actual Working Pressure
MAWP	Maximum Allowable Working Pressure
MAWP	Maximum Allowable Working Pressure
Mbbls	Thousand Barrels
Mbbls/d	Thousand Barrels Per Day
Mbd	Thousand Barrels (Of Oil) Per Day
Mbod	Thousand Barrels Of Oil Per Day
Mboe	Thousand Barrels Of Oil Equivalent
Mboe/d	Thousand Barrels Of Oil Equivalent Per Day
MBRO	Multi Bore Restriction Orifices
MBT	Methylene Blue Test
MCA	Marine Coastguard Agency
MCC	Master Control Center
MCC	Molded Case Circuit Breaker
MCD	Mechanical Completion Dossier
MCE	Maximum Credible Earthquakes
Mcf	Thousand Cubic Feet (Of Gas)
MCFD	Thousand Cubic Feet Per Day
Mcfe	Thousand Cubic Feet Of Natural Gas Equivalent
MCFPD	One Thousand Cubic Feet Of Gas Per Day
MCHE	Main Cryogenic Heat Exchanger
MCM	Manifold Choke Module
MCP	Manifold Compression Platform
MCS	Manifold & Connection System
MCS	Master Control Station
MD	Measured Depth
MD	Measurements/Drilling Log
mD	Millidarcy, Measure Of Permeability, With Units Of Area
MDEA	Methyl Diethanolamine (Amdea)
MDL	Methane Drainage Licence
MDO	Marine Diesel Oil
MDSS	Measured Depth Sub Sea
MDT	Modular Formation Dynamic Tester
MEA	Monoethanolamine
MEG	Mono Ethylene Glycol
MEM	Mechanical Earth Model
MEO	Medium Earth Orbit (For Satellite Configuration)
MEPC	Marine Environment Protection Committee
MEPRL	Mechanical Properties Log
MERCR	Mercury Injection Study Report
MERG	Merge Fdc/Cnl/Gamma Ray/Dual Laterolog/Micro Sfl Log
MERSAR	Merchant Ship Search And Rescue Manual
MEST	Mest Log
MF	Marsh Funnel (Mud Viscosity)
MFCT	Multifinger Calliper Tool
Mgd	Million Gallons Per Day
MGL	Magnelog
MGN	Marine Guidance Note
MGO	Marine Gas Oil
Mgy	Million Gallons Per Year
MH	Methane Hydrate (Methane Clathrate, Or Fire Ice)
MHA	Major Hazards Analysis
MI	Matagorda Island Area Gulf Of Mexico Leasing Area
MI	Mechanical Integrity
MI	Mineral Interest
MIFR	Mini Frac Log
MINL	Minilog
MIPAL	Micropalaeo Log
MIRU	Move In And Rig Up
MIS	Management Information System
MIST	Minimum Industry Safety Training
MIYP	Maximum Internal Yield Pressure
MJ	Megajoule
mKB	Meters Below Kelly Bushing
ML	Microlog, Or Mud Log
ML	Multilateral
MLF	Marine Loading Facility
MLH	Mud Liner Hanger
MLL	Microlaterolog
MLLW	Mean Lower Low Water
MSIPC	Multi Stage Inflatable Packer Collar
MSL	Mean Sea Level
MSL	Micro Spherical Log
MSP	Maximum Source Pressure
MSRC	Marine Spill Response Corporation
MSS	Magnetic Single Shot
MST	Mst Exp Resistivity Log
MT	Magnetotellurics
MT	Metric Tons
MTBE	Methyl Tertiary Butyl Ether
MTLP	Mini Tension Leg Platform
MTR	Material Test Reports
MTSRU	Maritime Transportation System Recovery Unit
MTT	Mtt Multi Isotope Trace Tool
MTTF	Mean Time To Failure
MU	Mustang Island Area Gulf Of Mexico Leasing Area
MUD	Mud Log
MUDT	Mud Temperature Log
MuSol	Mutual Solvent
MUX	Make Up Crossover [Crossover X]
MVA	Megavolt Amperes
MVB	Master Valve Block On Xmas Tree
MW	Megawatts
MW	Mud Weight
MWA	Military Warning Area
MWCC	Marine Well Containment Co.
MWD	Measurement While Drilling
MWDRE	Measurement While Drilling Report
MWS	Marine Warranty Survey
N	Newton
N/S	North/South
N02	Nitrogen Dioxide
N0X	Nitrogen Oxides
NAAQS	National Ambient Air Quality Standards
NACE	National Association Of Corrosion Engineers
NAFTA	North American Free Trade Agreement
NAPF	Non Aqueous Phase Fluid
NAVIG	Navigational Log
NAVTEX	Navigational And Meteorological Warning Broadcast Service
NB	Nominal Bore
NCOB	No Cargo On Board
NCP	US National Oil And Hazardous Substance Pollution Contingency Plan
NCR	Nonconformance Report
NDE	Non Destructive Examination
NDT	Nondestructive Testing
NE	Northeast
NEB	National Energy Board
NEPA	US National Environmental Policy Act
NEUT	Neutron Log
NFI	No Further Investment
NFTZ	Non Free Trade Zone
NFW	New Field Wildcat, Lahee Classification
NG	Natural Gas
NGDC	National Geoscience Data Centre (United Kingdom)
NGH	Natural Gas Hydrate (Methane Clathrate, Or Fire Ice)
NGL	Natural Gas Liquids
NGLQT	Ngt Ql Log
NGO	Non Governmental Organisation
NGPL	Natural Gas Pipeline
NGR	Natural Gamma Ray
NGRC	National Geological Records Centre (United Kingdom)
NGS	Ngs Log
NGSS	Ngs Spectro Log
NGT	Ngt Log
NGTLD	Ngt Ldt Ql Log
NGTR	Ngt Ratio Log
NHDA	National Hydrocarbons Data Archive (United Kingdom)
NHPV	Net Hydrocarbon Pore Volume
NI	The Nautical Institute
NIHQ	Nautical Institute Headquarters, London
NIOSH	National Institute For Occupational Safety
NITC	Normal Incremental Transfer Capability
NK or NKK (or ClassNK)	Nippon Kaiji Kyokai (Japan’S Ship Classification Society)
NM	Nautical Mile
NMEA	National Marine Electronics Association
NMFS	National Marine Fisheries Services (Noaa Fisheries)
NMHC	Non Methane Hydrocarbons
NMR	Nuclear Magnetic Resonance
NMVOC	Non Methane Volatile Organic Compounds
NNR	National Nature Reserve
NNS	Northern North Sea
NO	Nitric Oxide
NOAA	National Oceanic And Atmospheric Administration
NOC	National Oil Company
NOD	Notice Of Determination
NOGEPA	Netherlands Oil And Gas Exploration And Production Association
NOI	Notice Of Inquiry
NOI	Notice Of Intent
NOIA	National Ocean Industries Association
NOISL	Noise Log
NOP	Notice Of Preparation
NOR	Notice Of Readiness
NORM	Naturally Occurring Radioactive Material
NOW	Non Hazardous Oilfield Waste
NOX	Nitrogen Oxides
NP	Non Producing Well (As Opposed To P Producing Well)
NPD	Norwegian Petroleum Directorate
NPDES	National Pollutant Discharge Elimination System
NPFC	US National Pollution Funds Center
NPR	Notice Of Proposed Rulemaking
NPREP	National Preparedness For Response Exercise Program
NPS	Nominal Pipe Size (Sometimes Ns)
NPSH	Net Positive Suction Head
NPT	Nonproductive Time
NPV	Net Present Value
NPW	New Pool Wildcat, Lahee Classification
NRC	National Response Center
NRDA	National Resource Damage Assessment
NRI	Net Revenue Interest
NRT	National Response Team
NRV	Non Return Valve
NSA	Norwegian Shipowners’ Association
NSDG	North Sea Decommissioning Group
NT	Net Tonnage
NTE	Not To Exceed
NTHF	Non Toxic High Flash
NTL	Notice To Lessees And Operators
NTO	National Training Organization
NTP	National Toxicology Program
NTSB	US National Transportation Safety Board
NTU	Nephelometric Turbidity Unit
NUMAR	Magnetic Resonance Image Log
NUMAST	National Union Of Marine, Aviation & Shipping Transport Officers
NWI	Net Working Interest
NWR	National Wildlife Refuge
NYMEX	New York Mercantile Exchange
O&G	Oil And Gas
O&M	Operations And Maintenance
O/B	On Board
OAPEC	Organization Of Arab Petroleum Exporting Countries
OB	Overbalanced
OBC	Ocean Bottom Cable (Seismic Collection)
OBCS	Ocean Bottom Cable System
OBDTL	Obdt Log
OBEVA	Obdt Evaluation Report
OBM	Oil Based Mud
OBO	Ore/Bulk/Oil Carrier
OCA	Offshore Contractors Association
OCIMF	Oil Companies International Marine Forum
OCL	Quality Control Log
OCR	Optical Character Recognition
OCS	Outer Continental Shelf
OCSLA	Outer Continental Shelf Lands Act
OCTG	Oil Country Tubular Goods
OD	Outer Diameter
ODT	Oil Down To
OECD	Organization For Economic Co Operation And Development
OEM	Original Equipment Manufacturer
OEM	Original Equipment Manufacturer
OES	Office Of Emergency Services
OFST	Offset Vertical Seismic Profile
OG	Oil And Gas Directorate
OGITF	Oil & Gas Industry Task Force
OGML	Oil, Gas And Mineral Lease
OGP	International Association Of Oil & Gas Producers
OH	Open Hole
OH	Openhole Log
OHC	Open Hole Completion
OHGP	Openhole Gravel Pack
OIAC	Oil Industry Advisory Committee
OIM	Offshore Installation Manager
OIP	Oil In Place
OLF	Norwegian Oil Industry Association
OMB	US Office Of Management And Budget
OMBO	One Man Bridge Operation
OML	Oil Mining Lease
OMRL	Oriented Micro Resistivity Log
ONAN	Oil Natural Air Natural Cooled Transformer
ONRR	Office Of Natural Resources Revenue
OOC	Offshore Operators Committee
OOD	Officer Of The Deck
OOE	Offshore Operation Engineer
OOIP	Original Oil In Place
OOT	Out Of Tolerance
OOW	Officer Of The Watch
OP	Operating Procedure
OPA	US Oil Pollution Act Of 1990
OPEC	Organisation Of Petroleum Exporting Countries
OPEX	Operating Expenditure
OPITO	Offshore Petroleum Industry Training Organization
OPL	Operations Log
OPPR	Oil Pollution Preparedness And Response
OPR	Office Of Planning And Research
OPRC	International Convention On Oil Pollution Preparedness, Response And Co Operation
OPRES	Overpressure Log
OPS	Operations Report
OPS	US Office Of Pipeline Safety
ORICO	Oriented Core Data Report
ORM	Other Regulated Materials (A Dot Materials Classification)
ORRI	Overriding Royalty Interest
OS&D	Over, Short & Damage (Report)
OSC	On Scene Coordinator
OSCP	Oil Spill Contingency Plan
OSFR	Oil Spill Financial Responsibility
OSHA	Occupational Safety And Health Administration
OSLTF	Oil Spill Liability Trust Fund
OSPR	Oil Spill Prevention And Response
OSRA	Oil Spill Risk Assessment
OSRAM	Oil Spill Risk Analysis Model
OSRO	Oil Spill Response Organization
OSRP	Oil Spill Response Plan
OSRV	Oil Spill Response Vessel
OSV	Offshore Support Vessel
OT	A Well On Test
OT	Off Tree
OT	Overtime
OTC	Offshore Technology Conference
OTDR	Optical Time Domain Reflectometry
OTIP	Operational Testing Implementation Plan
OTJ	On The Job
OTL	Operations Team Leader
OTO	Oil Taxation Office (Of The Inland Revenue)
OUT	Oil Up To
OUT	Outpost, Lahee Classification
OVCH	Oversize Charts
OVID	Offshore Vessel Inspection Database
OVSP	Offset Vertical Seismic Profiling
OWC	Oil Water Contact
OWR	Oil/Water Ratio
P	Pressure
P	Producing Well (As Opposed To Np Non Producing)
P	Wave Compressional Wave
P&A	Plug And Abandon
P&A	Plugged And Abandoned (Of A Well)
P&I (or P and I)	Protection And Indemnity Club
P&ID	Piping And Instrument Diagrams
PAC	Pacific Ocs Region
PADPRT	Pressure Assisted Drillpipe Running Tool
PAGA	Public Address General Alarm
PAH	Poly Aromatic Hydrocarbons
PAL	Palaeo Chart
PALYN	Palynological Analysis Report
PAM	Passive Acoustic Monitoring
Panamax	Ships Able To Transit, And Allowed Transit, Of The Panama Canal
PAR	Pre Assembled Rack
PART	Program Assessment Rating Tool
PAU	Pre Assembled Unit
PB	St. Petersburg Gulf Of Mexico Leasing Area
PBD	Pason Billing System
PBDMS	Playback Dmsls Log
PBR	Polished Bore Receptacle (Component Of A Completion String)
PBTD	Plug Back Total Depth
PBU	Pressure Build Up (Applies To Integrity Testing On Valves)
PCB	Poly Chlorinated Biphenyl
PCCL	Perforation Casing Collar Locator Log
PCDM	Power And Control Distribution Module
PCKR	Packer
PCOLL	Perforation And Collar
PCP	Progressive Cavity Pump
PCV	Pressure Control Valve
PDC	Perforation Depth Control
PDC	Polycrystalline Diamond Compact (Drillbit)
PDG	Permanent Downhole Gauge
PDG/PDHG	Permanent Downhole Gauge
PDKL	Pdk Log
PDKR	Pdk 100 Report
PDM	Positive Displacement Motors
PDNP	Proved Developed Not Producing
PDP	Proved Developed Reserves
PDPM	Power Distribution Protection Module
PE	Professional Engineer
PEA	Palaeo Environment Study Report
PEDL	Petroleum Exploration & Development Licence
PEL	Permissible Exposure Limit
PENL	Penetration Log
PEP	Pep Log
PERDC	Perforation Depth Control
PERFO	Perforation Log
PERM	Permeability
PERML	Permeability Log
PESA	Petroleum Equipment Suppliers Association
PESBG	Petroleum Exploration Society Of Great Britain
PETA	Petrographical Analysis Report
PETD	Petrographic Data Log
PETLG	Petrophysical Evaluation Log
PETPM	Petrography Permeametry Report
PETRP	Petrophysical Evaluation Report
PF	Platform
PFC	Pfc Log
PFD	Position Fixing Device, Personal Floatation Device
PFD	Process Flow Diagrams
PFE	Plate/Frame Heat Exchanger
PFHE	Plate Fin Heat Exchanger
PFPG	Perforation Plug Log
PFREC	Perforation Record Log
PG	Pressure Gauge (Report)
PGB	Permanent Guide Base
PGOR	Produced Gas Oil Ratio
PH	Phasor Log
PHA	Process Hazards Analysis
PHASE	Phasor Processing Log
Phi	Porosity
PHMSA	US Department Of Transportation Pipeline And Hazardous Materials Safety Administration
PHOL	Photon Log
PHYFM	Physical Formation Log
PI	Pressure Indicator
PI	Productivity Index
PIANC	Permanent International Association Of Navigation Congresses
PIC	Person In Charge
PILOT	Ogitf Successor
PINC	Potential Incident Of Non Compliance
PINTL	Production Interpretation
PIP	Pipe In Pipe
PIT	Pressure Integrity Test
PJ	Petajoule
PL	Pipeline
PL	Production Licence
PLB	Personal Locator Beacon
PLC	Programmable Logic Controller
PLEM	Pipeline End Manifold
PLES	Pipeline End Structure
PLET	Pipeline End Terminations
PLG	Plug Log
PLS	Position Location System
PLT	Production Logging Tool
PLTQ	Production Logging Tool Quicklook Log
PLTRE	Production Logging Tool Report
PM	Particulate Matter
PM	Project Management
PM10	Particulate Matter Less Than 10 Microns In Diameter
PM2.5	Particulate Matter Less Than 2.5 Microns In Diameter
PMI	Positive Material Identification
PMS	Planned Maintenance System
PMV	Production Master Valve
PN	North Padre Island Area Gulf Of Mexico Leasing Area
POB	Personnel On Board
POBM	Pseudo Oil Based Mud
POF	Permanent Operations Facility
PON	Petroleum Operations Notice
POOH	Pull Out Of Hole
POOH / POH	Pull Out Of Hole
POOI	Pacific Operators Offshore Incorporated
POR	Density Porosity Log
POSFR	Post Fracture Report
POSTW	Post Well Appraisal Report
POSVCM	Pipeline Oil Spill Volume Computer Model
POSWE	Post Well Summary Report
POV	Pressure Operated Valves
PP	Dxc Pressure Plot Log
PP	Pore Pressure
PP	Pump Pressure
PPA	Pounds Of Proppant Added
ppb	Parts Per Billion
ppcf	Pounds Per Cubic Foot
PPE	Personal Protective Equipment
PPE	Preferred Pressure End
ppg	Pounds Per Gallon
PPI	Post Pipelay Installation
PPI	Post Production Inspection/Intervention
ppm	Parts Per Million
PPS	Production Packer Setting
ppt	Parts Per Thousand
pptf	Pounds (Per Square Inch) Per Thousand Feet (Of Depth)
PR	Pully Ridge Gulf Of Mexico Leasing Area
PR2	Testing Regime To Api6A Annex F
PRA	Probabilistic Risk Assessment
PRA	Production Reporting & Allocation
PRCI	Pipeline Research Council International, Inc.
PREC	Perforation Record
PRESS	Pressure Report
PROD	Production Log
PROTE	Production Test Report
PROX	Proximity Log
PRS	Polish Register Of Shipping
PRSRE	Pressure Gauge Report
PRT	Petroleum Revenue Tax
PS	South Padre Island Gulf Of Mexico Leasing Area
PSA	Production Sharing Agreement
PSAC	Petroleum Services Association Of Canada
PSANA	Pressure Analysis
PSC	Port State Control
PSC	Production Sharing Contract
PSD	Planned Shut Down
PSD	Prevention Of Significant Deterioration
PSE	Pressure Safety Element
PSH	Pressure Safety High (Sensor)
PSHL	Pressure Safety High/Low
psi	Pounds Per Square Inch
psia	Pounds Per Square Inch (Absolute)
psig	Pounds Per Square Inch (Gauge)
PSL	Pressure Safety Low
PSL	Product Specification Level
PSL	Product/Service Line
PSLOG	Pressure Log
PSM	Process Safety Management
PSO	Protected Species Observer
PSP	Pseudostatic Spontaneous Potential
PSPL	Psp Leak Detection Log
PSQ	Plug Squeeze Log
PSR	Pipe Slip Ram
PSR	Pre Startup Review
PST	Pst Log
PSV	Pipe Supply Vessel
PSV	Pressure Safety Valve
PSVAL	Pressure Evaluation Log
PTA/S	Pipeline Termination Assembly/Structure
PTO	Permit To Operate
PTSET	Production Test Setter
PTTC	Petroleum Technology Transfer Council, United States
PTW	Permit To Work
PU	Pick Up (Tubing, Rods, Power Swivel, Etc.)
PUD	Proved Undeveloped Reserves
PUN	Puncher Log
PUR	Plant Upset Report
PUWER	Provision And Use Of Work Equipment Regulations
PV	Plastic Viscosity
PV	Pore Volume
PV	Pressure/Vacuum
PVC	Polyvinyl Chloride
PVC	Pressure Control Valve
PVSV	Pressure Vacuum Safety Valves
PVT	Pressure Volume Temperature
PVTRE	Pressure Volume Temperature Report
PW	Produced Water
PWB	Production Wing Block (Xt)
PWHT	Post Weld Heat Treat
PWRI	Produced Water Re Injection
PWV	Production Wing Valve
QA	Quality Assurance
QA/QC	Quality Assurance/Quality Control
QAE	Quality Assurance Engineer
QC	Quality Control
QCR	Quality Control Report
QF	Qualifying Facility
QHSE	Quality, Health, Safety, And Environmental
QI	Qualified Individual
QL	Quicklook Log
QR	Quality Ranking
QRA	Quantitative Risk Assessment
QUAD	Quadrillion Btus
R&D	Records And Documentation
R&D	Research And Development
R&R	Roles And Responsibilities
RAC	Ratio Curves
RACI	Responsible / Accountable / Consulted / Informed
RAM	Reliability, Availability, And Maintainability
RAWS	Raw Stacks Vsp Log
RBP	Retrievable Bridge Plug
RCA	Root Cause Analysis
RCC	Rescue Coordination Centre
RCCD	Reverse Circulation Centre Discharge
RCD	Rotating Control Device
RCDS	Raster Chart Display Systems
RCI	Reservoir Characterization Instrument
RCKST	Rig Checkshot
RCL	Retainer Correlation Log
RCM	Reliability Centred Maintenance
RCR	Remote Component Replacement (Tool)
RCRA	US Resource Conservation And Recovery Act
RCU	Remote Control Unit
RDF	Radio Direction Finder
RE	Pe Re Perforation Report
RE	Reservoir Engineer
REACH	Registration, Evaluation, Authorization, And Restriction Of Chemicals
REL	Recommended Exposure Limit
RENC	Regional Electronic Navigational Chart Coordinating Centre
REOR	Reorientation Log
RESAN	Reservoir Analysis
RESEV	Reservoir Evaluation
RESFL	Reservoir Fluid
RESI	Resistivity Log
RESL	Reservoir Log
RESOI	Residual Oil
REWL	Reservoir Evaluation,Wireline
REZ	Renewable Energy Zone (United Kingdom)
RF	Radio Frequency
RF	Range Finder
RF	Recovery Factor
RFI	Request For Interest
RFI	Requests For Inspection
RFID	Radio Frequency Identification
RFLNG	Ready For Liquefied Natural Gas
RFMTS	Repeat Formation Tester
RFSU	Ready For Start Up
RFT	Repeat Formation Tester
RFTRE	Repeat Formation Tester Report
RFTS	Repeat Formation Tester Sample
RI	Royalty Interest
RIGMO	Rig Move
RIH	Run In Hole
RIK	Replacement In Kind
RINA	Royal Institution Of Naval Architects
RIR	Recordable Incident Rate
RITT	Riser Insertion Tube (Tool)
RK	Rankin Gulf Of Mexico Leasing Area
RKB	Rotary Kelly Bushings
RLOF	Rock Load Out Facility
RMC	Rigid Metal Conduit
RMLC	Request For Mineral Land Clearance
RMP	Reservoir Management Plan
RMS	Ratcheting Mule Shoe
RMT	National Union Of Rail, Maritime And Transport Workers
RN	Release Notes
RNC	Raster Navigational Chart
RNR	Romanian Maritime Register Of Shipping
RNT	Rnt Log
Ro	Ro Roll On/Roll Off
ROA	Return Of Assets
ROB	Remain On Board (Cargo, Bunkers)
SBM	Synthetic Based Mud
SBT	Segmented Bond Tool
SC	Seismic Calibration
SCADA	Supervisory Control And Data Acquisition (System)
SCAL	Special Core Analysis
SCAP	Scallops Log
SCBA	Self Contained Breathing Apparatus
SCDES	Sidewall Core Description
SCE	Safety Critical Equipment
scf	Standard Cubic Feet (Of Natural Gas)
SCHLL	Schlumberger Log Also Schlo, Schlu
SCM(MB)	Subsea Control Module (Mounting Base)
SCO	Standard Cost Obligation
SCO	Synthetic Crude Oil
SCOPIC	Special Compensation P&I Clause
SCOTUS	Supreme Court Of The United States
SCP	Sustained Casing Pressure
SCR	Spot Check Report
SCR	Steel Catenary Riser
SCR	Special Casualty Representative (P&I)
SCRS	Sidewall Cores
SCSSV	Surface Controlled Subsurface Safety Valve
SCUBA	Self Contained Underwater Breathing Apparatus
SD	Dynamic Positioning Semisubmersible
SD	Sonic Density
SDFD	Shut Down For Day
SDFN	Shut Down For Night
SDIC	Sonic Dual Induction
SDL	Supplier Document List
SDM/U	Subsea Distribution Module/Unit
SDPBH	Sdp Bottom Hole Pressure Report
SDT	Step Draw Down Test (Sometimes Sddt)
SDU/M	Subsea Distribution Unit/Module
SDV	Shutdown Valve
SDW	Summer Dead Weight
SEA	Site Specific Environmental Assessment
SEA	Special End Area
SEA	Strategic Environmental Assessment (United Kingdom)
SEAL	Shearwater Elgin Area Line
SEC	US Securities And Exchange Commission
SECGU	Section Gauge Log
SEDHI	Sedimentary History
SEDIM	Sedimentology
SEDL	Sedimentology Log
SEDRE	Sedimentology Report
SEG	Society Of Exploration Geophysicists
SEIR	Supplemental Environmental Impact Report
SEIS	Supplemental Environmental Impact Statement
SEM	Subsea Electronics Module
SEMI	Semisubmersible, Semi (or Semi Sub) Semi Submersible Drilling Rig
SEMP	Safety And Environmental Management Plan
SEMS	Safety And Environmental Management System Policy
SENC	System Electronic Navigational Chart
SEPAR	Separator Sampling Report
SEQSU	Sequential Survey
SES	Satellite Earth Station
SES	Seafarers’ Education Service
SFEIS	Supplemental Final Environmental Impact Statement
SFL	Steel Flying Lead
SFV	Straight Fixed Variable
SG	Static Gradient
SGS	Steel Gravity Substructure
SGSI	Shell Global Solutions International
SGUN	Squeeze Gun
SHA	Sensor Harness Assembly
SHARP	Sustainable Hydrocarbons Additional Recovery Programme
SHDT	Stratigraphic High Resolution Dipmeter Tool
SHL	Surface Hole Location
SHO	Stab And Hinge Over
SHOCK	Shcok Log
SHOWL	Show Log
SI	Shut In
SI/TA	Shut In/Temporarily Abandoned
SIC	Standard Industrial Classification
SICP	Shut In Casing Pressure
SIDPP	Shut In Drill Pipe Pressure
SIDSM	Sidewall Sample
SIGTTO	Society Of International Gas Tanker And Terminal Operators
SIMCON	Simultaneous Construction
SIMOPS	Simultaneous Operations
SIP	Shut In Pressure
SIPES	Society Of Independent Professional Earth Scientists, United States
SIRE	Ship’S Inspection Report
SIS	Safety Instrumented Systems
SIT	System Integration Test Fr Sit Field Representation Sit
SITHP	Shut In Tubing Hanger/Head Pressure (Another Term For Cithp)
SITP	Shut In Tubing Pressure
SITT	Single Tt Log
SIWHP	Shut In Well Head Pressure
Sjofartsverket	Swedish Register Of Shipping, Swedish Maritime Administration
SKPLT	Stick Plot Log
SL	Seismic Lines
SLCO	Saudi Light Crude Oil (Benchmark Crude)
SLS	Sls Gr Log
SLT	Slt Gr Log
SM	South Marsh Island Gulf Of Mexico Leasing Area
SMA	Small Amount
SMarT	Support For Maritime Training Scheme
SMB	Santa Maria Basin
SMC	Safety Management Certificate
SME	Small And Medium Sized Enterprises
SME	Subject Matter Expert
SMEs	Small And Medium Sized Enterprises
SMI	South Marsh Island Gulf Of Mexico Leasing Area
SMLS	Seamless Pipempp
SMO	Suction Module
SMPC	Subsea Multiphase Pump
SMS	Safety Management Systems
SN	Seat Nipple
SNAM	Societá Nazionale Metanodotti Now Snam S.P.A. (Italy)
SNG	Synthetic Natural Gas
SNIP	Scotland Northern Ireland Pipeline
SNP	Sidewall Neutron Porosity
SNS	Southern North Sea
SO	Oil Saturation
SO2	Sulfur Dioxide
SO3	Oxides Of Sulfur
SOBM	Synthetic Oil Based Mud
SOC	Statement Of Overriding Consideration
SOLAS	International Convention For Safety Of Life At Sea
SONCB	Sonic Calibration Log
SONRE	Sonic Calibration Report
SONS	Spills Of National Significance
SONWR	Sonic Waveform Report
SONWV	Sonic Waveform Log
SOO	Suspension Of Operation
SOP	Standard Operating Procedure
SOP	Suspension Of Production
SOPEP	Shipboard Oil Pollution Emergency Plan
SOSC	State On Scene Coordinator
SOSREP	Secretary Of State’S Representative For Marine Salvage And Intervention
Sour	Oil/Gas With High Sulfur Content
SOW	Statements Of Work
SOW _ Slip	On Wellhead
SP	Shot Point (Geophysics)
SP	South Pass Area Gulf Of Mexico Leasing Area
SP	Spontaneous Potential (Well Log)
SPA	Special Protection Area
SPAR	Floating Production System
SPBM	Single Point Buoy Mooring System
SPCAN	Special Core Analysis
SPCC	Spill Prevention Control And Countermeasures
SPCCP	Spill Prevention Control And Countermeasure Plan
SPCP	Spill Prevention And Cleanup Plan
SPE	Society Of Petroleum Engineers
SPEAN	Spectral Analysis
SPEL	Spectralog
spf	Shots Per Foot
SPFM	Single Phase Flow Meter
SPH	Sph Log
SPI	Ship Port Interface
SPM	Side Pocket Mandrel Or Strokes Per Minute
SPM	Single Point Mooring
SPMT	Self Propelled Modular Transporter
SPOP	Spontaneous Potential Log
SPP	Stand Pipe Pressure
SPR	US Strategic Petroleum Reserve
SPROF	Seismic Profile
SPS	Submerged Production System
SPS	Subsea Production Systems
SPT	Shallower Pool Test, Lahee Classification
SPWLA	Society Of Petrophysicists And Well Log Analysts
SQL	Siesmic Quicklook Log
SR	Shear Rate
SRD	Seismic Reference Datum
SREC	Seismic Record Log
SRL	Self Retracting Lifelines/Div>
SRT	Site Receival Test
SS	Semisubmersible
SS	Ship Shoal Area Gulf Of Mexico Leasing Area
SS	Stainless Steel
SS	Subsea
SSANC	Fixed Anchors Or Mooring Piles
SSCC	Sulphide Stress Corrosion Cracking
SSCP	Subsea Cryogenic Pipeline
SSCS	Subsea Control System
SSCSV	Subsurface Controlled Safety Valve
SSCV	Subsea Control Valves
SSD	Sliding Sleeve Door
SSD	Sub Sea Level Depth
SSE	Short Service Employee
SSG	Sidewall Sample Gun
SSIV	Subsea Isolation Valve
SSM	Subsea Manifolds
SSMAR	Synthetic Seismic Marine Log
SSMNF	Subsea Manifold
SSO	Ship Security Officer
SSPLR	Subsea Pig Launcher/Receiver
SSRRC	System Safety And Reliability Review Committee
SSSL	Supplementary Seismic Survey Licence
SSSV	Sub Surface Safety Valve
SSTMP	Subsea Templates
SSTT	Subsea Test Tree
SSU	Subsea Umbilicals
SSV	Surface Safety Valve
SSWI	Subsea Well Intervention
ST	Sidetrack
ST	South Timbalier Area Gulf Of Mexico Leasing Area
STAB	Stabiliser
STAGR	Static Gradient Survey Report
STB	Stock Tank Barrel
STC	Stc Log
STEL	Short Term Exposure Limit
STFL	Steel Tube Fly Lead
STGL	Stratigraphic Log
STIMU	Stimulation Report
STKPT	Stuck Point
STL	Stl Gamma Ray Log
STOIIP	Stock Tank Oil Initially In Place
STOOIP	Stock Tank Oil Initially In Place
STOP	Safety Training Observation Program
STP	Standard Temperature And Pressure
STRAT	Stratigraphy, Stratigraphic
STRRE	Stratigraphy Report
STSH	String Shot
SU	Submersible
SUBC	Self Unloading Bulk Carrier
SUML	Summarised Log
SUMRE	Summary Report
SUMST	Geological Summary Sheet
SUPSALV	US Navy Supervisor Of Salvage
SURF	Subsea/Umbilicals/Risers/Flowlines
SURFR	Surface Sampling Report
SURRE	Survey Report
SURVL	Survey Chart Log
SUT(A/B)	Subsea Umbilical Termination (Assembly/Box)
SUTU	Subsea Umbilical Termination Unit
SV	Sleeve Valve Or Standing Valve
SW	Salt Water
SW	Southwest
Sw	Water Saturation
SWA	Stop Work Authority
SWD	Salt Water Disposal Well
SWDW	Salt Water Disposal Well
SWE	Senior Well Engineer
Sweet	Oil/Gas That Has Low Sulfur Content
SWF	Shallow Water Flow
SWHE	Spiral Wound Heat Exchanger
SWL	Safe Working Load
SWOT	Strengths, Weaknesses, Opportunities And Threats
SWP	Safe Work Practices
SX	Sabine Pass (Louisiana) Gulf Of Mexico Leasing Area
SYNRE	Synthetic Seismic Report
SYSEI	Synthetic Seismogram Log
T	Well Flowing To Tank
TA	Temporarily Abandoned Well
TABS	Texas Automated Buoy System
TAC	Toxic Air Contaminants
TAC	Tubing Anchor
TAGOGR	Thermally Assisted Gas/Oil Gravity Drainage
TAML	Technology Advancement For Multilaterals
TAPLI	Tape Listing
TAPS	Trans Alaska Pipeline System (Also Called Alyeska Pipeline)
TAPVE	Tape Verification
TAR	True Amplitude Recovery
TB	Tubing Puncher Log
TBOSIET	Tropical Basic Offshore Safety Induction & Emergency Training
TBT	Through Bore Tree
TCA	Total Corrosion Allowance
TCF	Temporary Construction Facilities
Tcf	Trillion Cubic Feet
TCI	Tunsgten Carbide Insert (A Type Of Rollercone Drillbit)
TCP	Tubing Conveyed Perforating
TCPD	Tubing Conveyed Perforating Depth
TCR	Transition Cost Recovery
TCU	Thermal Combustion Unit
TD	Target Depth
TD	Total Depth (Depth Of The End Of The Well)
TDD	Total Depth (Driller)
TDH	Total Dynamic Head
TDL	Total Depth (Logger)
TDM	Touch Down Monitoring
TDS	Top Drive System
TDS	Total Dissolved Solids
TDT	Tdt Log
TDT GR	Tdt Gamma Ray Casing Collar Locator Log
TDTCP	Tdt Cpi Log
TDU	Transmission Dependent Utility
TEFC	Totally Enclosed Fan Cooled
TEG	Tri Ethylene Glycol
TELER	Teledrift Report
TEMP	Temperature Log
TEMPSC	Totally Enclosed Motor Propelled Survival Craft
TEU	Twenty Feet Equivalent Unit
TF	Tropical Fresh Load Line
TFL	Through Flow Line
TFM	Taskforcemajella Research Project
Tfx	Toxic Effects
TGB	Temporary Guide Base
TGOR	Total Gas Oil Ratio
TH	Tubing Hanger
THAI	Toe To Heel Air Injection (Method)
THERM	Thermometer Log
THERP	Technique For Human Error Rate Prediction
THP	Tubing Hanger Pressure
THP	Tubing Head Pressure
THRT	Tubing Hanger Running Tool
TIE	Tie In Log
TIEBK	Tieback Report
TIH	Trip Into Hole
TIMS	Technical Information Management System
TIW	Texas Iron Works (Pressure Valve)
TJ	Terajoule
TLI	Top Of Logging Interval
TLL	Timber Load Line
TLOG	Technical Log
TLP	Tension Leg Platform
TLV	Threshold Limit Value
TMCM	Tranverse Mercator Central Meridian
TMD	Total Measured Depth In A Wellbore
TNDT	Thermal Neutron Decay Time
TNDTG	Thermal Neutron Decay Time/Gamma Ray Log
TOC	Top Of Cement
TOC	Total Organic Content/Carbon
TOFD	Time Of First Data Sample (On Seismic Trace)
TOFS	Time Of First Surface Sample (On Seismic Trace)
TOH	Trip Out Of Hole
TOL	Top Of Liner
TOOH	Trip Out Of Hole
TORAN	Torque And Drag Analysis
TOU	Time Of Use
TP	Tarpon Springs Gulf Of Mexico Leasing Area
TPERF	Tool Performance
TPI	Third Party Inspector
TPI	Tones Per Inch Immersion
TPIC	Terminal Person In Charge
TQ	Training Qualifications
TQM	Total Quality Management
TR	Temporary Refuge
TRA	Tracer Log
TRACL	Tractor Log
TRCFR	Total Recordable Case Frequency Rate
TRD	Total Report Data
TREAT	Treatment Report
TREP	Test Report
TRIP	Trip Condition Log
TRIR	Total Recordable Incident Rate
TRSCSSSV	Tubing Retrievable Surface Controlled Sub Surface Safety Valve
TRSCSSV	Tubing Retrievable Surface Controlled Sub Surface Valve
TRSV	Tubing Retrievable Safety Valve
TRT	Tree Running Tool
TS	Tiger Shoal Gulf Of Mexico Leasing Area
TSA	Thermally Sprayed Aluminium
TSCA	US Toxic Substances Control Act
TSE	Temperature Safety Element
TSH	Temperature Safety High (Sensor)
TSI	Temporarily Shut In
TSI	Transportation Security Incidents
TSS’s	Traffic Separation Schemes
TT	Torque Tool
TT	Transit Time Log
TT	Travel Time
TTC	Total Transfer Capability
TTP	Through Tubing Perforating
TTRD	Through Tubing Rotary Drilling
TUM	Tracked Umbilical Machine
TV/BIP	Ratio Of Total Volume (Ore And Overburden) To Bitumen In Place
TVBDF	True Vertical Depth Below Derrick Floor
TVD	True Vertical Depth
TVDPB	True Vertical Depth Playback Log
TVDSS	True Vertical Depth Subsea
TVELD	Time And Velocity To Depth
TVRF	True Vertical Depth Versus Repeat Formation Tester
TWA	Time Weighted Average
TWT	Two Way Time (Seismic)
TWTT	Two Way Travel Time
TWTTL	Two Way Travel Time Log
TZ	Transition Zone
UB	Underbalanced
UBD	Underbalanced Drilling
UBI	Ultrasonic Borehole Imager
UBIRE	Ultrasonic Borehole Imager Report
UBS	Universal Bulk Ship
UCS	Unconfined Compressive Strength
UCSU	Upstream Commissioning And Start Up
UEL	Upper Explosive Limit
UFC	Uniform Fire Code
UFJ	Upper Flex Joint
UFL	Upper Flammable Limit
UGF	Universal Guide Frame
UIC	Underground Injection Control
UKCS	Uk Continental Shelf
UKCS	United Kingdom Continental Shelf
UKOCS	Uk Outer Continental Shelf
UKOOA	United Kingdom Offshore Operators Association
UKOOG	United Kingdom Onshore Operators Group
UKPIA	United Kingdom Petroleum Industry Association Limited
ULBC	Ultra Large Bulk Carrier
ULCC	Ultra Large Crude Carrier
ULCGR	Uncompressed Ldc Cnl Gamma Ray Log
UMCA	Umbilical Midline Connection Assembly
UMS	Universal Measurement System
UMV	Upper Master Valve (From A Xmas Tree)
UN	United Nations
UNCLOS	United Nations Convention On The Law Of The Sea
UOT	Unscheduled Overtime
UPR	Upper Pipe Ram
URR	Ultimately Recoverable Resources
URT	Universal Running Tool
USC	United States Code
USCG	United States Coast Guard
USDA	US Department Of Agriculture
USDOI	US Department Of Interior
USDOT	US Department Of Transportation
USEPA	US Environmental Protection Agency
USFWS	US Fish And Wildlife Service
USGS	United States Geological Survey
USV	Underwater Safety Valve
UT	Ultrasonic Testing
UTA	Umbilical Termination Assembly
UTC	Universal Time (Coordinated)
UTM	Universal Transverse Mercator
UV	Ultra Violet
UWI	Unique Well Identifier
UWT	Ultrasonic Welding Line
VCG	Vertical Centre Of Gravity
VDENL	Variation Density Log
VDL	Vdl Log (Variable Density Log)
VDR	Voyage Data Recorder
VDU	Vacuum Distillation Unit, Used In Processing Bitumen
VDU	Visual Display Unit
VELL	Velocity Log
VERAN	Verticality Analysis
VERIF	Verification List
VERLI	Verification Listing
VERTK	Vertical Thickness
VIR	Value Investment Ratio
VISME	Viscosity Measurement
VIV	Vortex Induced Vibration
VK	Viosca Knoll Gulf Of Mexico Leasing Area
VLBC	Very Large Bulk Carrier
VLCC	Very Large Crude Carrier
VLP	Vertical Lift Performance
VLTCS	Very Low Temperature Carbon Steel
VN	Vernon Gulf Of Mexico Leasing Area
VO	Variation Order
VOC	Volatile Organic Compounds
WGEO	Well Geophone Report
WGFM	Wet Gas Flow Meter
WGUNT	Water Gun Test
WH	Well History
Wh	White
WHFP	Wellhead Flowing Pressure
WHIG	Whitehouse Gauge
WHM	Wellhead Maintenance
WHMIS	Workplace Hazardous Material Information Systems
WHO	World Health Organisation
WHP	Wellhead Pressure
WHRU	Waste Heat Recovery Unit
WI	Water Injection
WI	Working Interest
WIPSP	Wip Stock Packer
WIS	Wave Information Study
WIT	Water Investigation Tool
WITS	Well Site Information Transfer System
WL	Water Line
WL	Wireline
WLC	Wireline Composite Log
WLL	Wireline Logging
WLSUM	Well Summary
WLTS	Well Log Transaction System
WMO	World Meteorological Organization
WMPI	Wet Magnetic Particle Inspection
WMU	World Maritime University
WO	Well In Work Over
WO/O	Waiting On Orders
WOA	Well Operations Authorization
WOB	Weight On Bit
WOC	Wait On Cement
WOC	Water Oil Contact (Or Oil Water Contact)
WOE	Well Operations Engineer (A Key Person Of Well Services)
WOM	Wait(Ing) On Material
WOR	Water Oil Ratio
WORKO	Workover
WOS	West Of Shetland, Oil Province On The Ukcs
WOW	Wait(Ing) On Weather
WP	Well Proposal Or Working Pressure
WP	Well Protector
WPC	Water Pollution Control
WPI	Wholesale Price Index
WPLAN	Well Course Plan
WPQ/S	Weld Procedure Qualification/Specification
WPR	Well Prognosis Report
WQ	A Textural Parameter Used For Cbvwe Computations (Halliburton)
WQC	Water Quality Certificate
WQCA	Water Quality Control Act
WQCB	Water Quality Control Board
WR	Walker Ridge Gulf Of Mexico Leasing Area
WR	Wet Resistivity
WR	Wireline Retrievable (As In A Wr Plug)
WRS	Well Report Sepia
WRSCSSV	Wireline Retrievable Surface Controlled Sub Surface Valve
WSCA	Well Services Contractors Association
WSCL	Well Site Core Log
WSE	Well Seismic Edit
WSERE	Well Seismic Edit Report
WSHT	Well Shoot
WSL	Well Site Log
WSO	Water Shut Off
WSOG	Well Specific Operation Guidelines
yd	Yard
YM	Young’S Modulus
YP	Yield Point
yr	Year
YTD	Year To Date
ZD	Zone Description
ZDENP	Density Log
ZDL	Compensated Z Densilog
ZOI	Zone Of Influence

by PipeAdmin
Tags: acronyms, structural

Feb 8, 2018

Acronyms – Construction Engineer

abbrev	define
AB	air brick
ABR	alternate bars reversed (reinforcement)
AC	alternating current or air conditioning
ACoP	approved code of practice
AIStructE	Associate of the Institution of Structural Engineers
ALT	alternate, alternately (reinforcement)
AMICE	Associate Member of the Institution of Civil Engineers
AMIStructE	Associate Member of the Institution of Structural Engineers
BBA	British Board of Agrément
BCA	British Cement Association
BCO	building control officer
BCSA	British Constructional Steelwork Association
BCWS	boosted cold water service (services)
BH	bore hole or beam height (survey)
BHWS	boosted hot water service (services)
BIG	back inlet gully
BLK	blockwork
BM	bending moment or bench mark
BOQ	bill of quantities
BRW	brick retaining wall (survey)
BS	British Standard
BSI	British Standards Institution
BW	brick wall (survey) or builders’ work (services)
BWF	barbed wire fence (survey)
BWIC	builders’ work in connection with (services)
BWK	brickwork
C	cill height (survey)
CA	contract administrator
CAD	computer aided design
CAM	computer aided manufacture
CBF	close boarded fence (survey)
CBW	concrete block wall (survey)
CC	centre to centre
CDM	Construction (Design and Management) Regulations
CE	conformité européene
CEng	chartered engineer
CGI	corrugated galvanized iron
CH	ceiling height
CHS	circular hollow section
CI	cast iron
CIF	corrugated iron fence (survey)
CJ	construction joint
CL	cover level or centre line
CLF	chain link fence (survey)
CP	code of practice
CPF	concrete panel fence (survey)
CPS	concrete paving slabs (survey)
CR	crown height of arch (survey)
CRS	centres
CRW	concrete retaining wall (survey)
CS	Concrete Society
CV	commissioning valve (services)
CW	concrete wall (survey)
CWS	cold water service (services)
CWT	hundredweight
D	diameter
DC	drain cock (services)
DCV	double check valve (services)
DHW	domestic hot water
DL	dead load
DOV	drain off valve (services)
DP	down pipe
DPC	damp-proof course
DPDT	double pole double throw switch (electrical)
DPM	damp-proof membrane
DPST	double pole single throw switch (electrical)
DRG	drawing
DS	District Surveyor
DSSO	double switched socket outlet (electrical)
E:
ECB	electricity control box
ECUK	Engineering Council United Kingdom
EL	existing level
EngTech	engineering technician
EPP	expanded polypropylene or environmentally preferred product
ERV	expansion relief valve (services)
FB	flower bed (survey) or from below (services)
FBTA	from below to above (services)
FC	flexible connection (services)
FF	far face (reinforcement)
FFL	finished floor level
FH	fire hydrant (survey)
FICE	Fellow of the Institution of Civil Engineers
FIStructE	Fellow of the Institution of Structural Engineers
FL	floor level
FoS	factor of safety
FS	full size or fused spur (electrical)
FSC	forest stewardship council (timber)
G	gully (survey)
G:
GGBS	ground granulated blastfurnace slag
GS	general structural (timber)
H or HT	window head height (survey)
HAC	high alumina cement
HDF	high density fibreboard
HL	high level
HSFG	high strength friction grip (steel connection)
HT	high tensile
HWS	hot water service (services)
IC	inspection cover (survey) or inspection chamber
ICE	Institution of Civil Engineers
ID	inside diameter
IEng	incorporated engineer
IL	invert level
INTER	intermediate switch (electrical)
IRF	iron railing fence (survey)
IStructE	Institution of Structural Engineers
IV	isolating valve (services)
IWF	interwoven fence (survey)
JCB	J C Bamford – manufacturer of wheeled excavators
JCT	Joint Contracts Tribunal
kg	kilogramme
kN	kiloNewton
L	light (survey)
LA	local authority
LL	live load
LOLER	Lifting Operations and Lifting Equipment Regulations 1998
LP	lamp post (survey)
LSL	laminated strand lumber
LSV	lockshield valve (services)
m	metre
MC	mass concrete or moderately conservative
MCW	mains cold water (services)
MDF	medium density fibreboard
MH	manhole
MHSW	Management of health and Safety at Work Regulations
MICE	Member of the Institution of Civil Engineers
MIStructE	Member of the Institution of Structural Engineers
mm	millimetre
MMMF	man made mineral fibres
MS	mild steel
N	Newton
NASC	National Access and Scaffolding Confederation
NF	near face (reinforcement)
NRV	non return valve (services)
NTS	not to scale
Ø	diameter
O:
OD	outside diameter or Ordnance datum
OH	over head
OPC	ordinary Portland cement
P	post
PALF	palisade fence (survey)
PC	precast concrete
PCC	Portland cement concrete
PF	picket fence (survey)
PFA	pulverised fuel ash
PFC	parallel flange channel
PKT	pocket (RC)
PL or PLT	plate (steel connection)
PPE	personal protective equipment, Personal Protective Equipment at Work Regulations
PRF	post and rail fence (survey)
PWD	Permanent Works Designer
PWF	post and wire fence (survey)
QS	quantity surveyor
R	render (survey)
RAD	radiator
RC	reinforced concrete
RE	rodding eye (survey)
RHPC	rapid hardening Portland cement
RHS	rectangular hollow section
RIBA	Royal Institute of British Architects
RICS	Royal Institution of Chartered Surveyors
RMC	ready-mixed concrete
RSA	rolled steel angle
RSJ	rolled steel joist
RWP	rain water pipe
S:
SC	stop cock
SE	structural engineer
SHS	square hollow section
SI	Systeme Internationale
SL	soffite level or sky light or sill level
SOL	setting-out line
SOP	setting-out point
SP	soil pipe (services); arch springer height (survey)
SPDT	single pole double throw switch (electrical)
SPS	stone paving slabs (survey)
SPST	single pole single throw switch (electrical)
SRC	sulphate resisting cement
SS	stainless steel or simply supported or special structural (timber)
SSL	structural slab level
SSSO	single switched socket outlet (electrical)
STG	staggered (RC)
STR	strainer (services)
SV	safety valve (services)
SVP	soil and vent pipe
SW	stone wall (survey)
T&G	tongued and grooved
TA	to above (services)
TBM	temporary bench mark
TIStructE	Technician of the Institution of Structural Engineers
TMICE	Technician Member of the Institution of Civil Engineers
TOB	top of beam
TOC	top of concrete
TOS	top of steel
TOW	top of wall
TP	town planning or trial pit
TPO	tree preservation order
TPRV	temperature/pressure relief valve (services)
TWC	temporary works coordinator
TWS	temporary works supervisor
U/S	underside
UB	universal beam
UC	universal column
UF	urea formaldehyde
UNO	unless noted otherwise
UTL	unable to lift (survey)
V	vent (survey)
VP	vent pipe (survey)
W	window (survey)
WAHR	Work at Height Regulations
WL	water level (survey)
WMF	wire mesh fence (survey)
WPF	wooden panel fence (survey)

by PipeAdmin
Tags: acronyms, structural

Feb 8, 2018

Definitions – Structural Engineer

abbrev	define
Access chamber:	Underground chamber enabling access to drains or other underground services.
Acre:	Unit of land area in the Imperial system; 4840 square yards, or the equivalent of a rectangular field one chain wide and one furlong long, approximately 4047 square metres or 0.4047 hectares.
Acrow:	A telescopic prop much used as a temporary support in construction. Named after the American manufacturer who first introduced them to the UK.
Additive:	Chemicals added to cement based products (concrete, mortar, render, screed etc) to impart various desirable properties such as to increase or reduce curing time, increase strength, enhance workability and so on. The amount of additives should be watched carefully since in excess or combination they can have undesirable effects.
Aggregate:	The stones and sand (coarse and fine aggregate respectively) used as a filler in concrete, asphalt etc.
Air conditioning:	Originally, a system by which fresh air is drawn from outside the building and brought to an acceptable condition in terms of temperature and humidity before being introduced into the building. The name is often also applied to chillers with no air handling, drying or heating capacity.
Aircrete:	A lightweight aerated cement-based material from which easily handled high insulating building-blocks are made. (Trade name.)
All-in ballast:	Ballast suitable for making into concrete without the addition of any other aggregate.
Angle:	Steel angle: a steel section whose cross-section is L-shaped. If the vertical and horizontal legs of the ‘L’ are the same length it is called an equal angle, if different, an unequal or odd leg angle. Angles are also available in other metals.
	An amount of rotation. The measurement of angles using 360 degrees in a whole circle, with each degree divided into 60 minutes of 60 seconds each, is of very great antiquity, going back to the Babylonians who used a number system based on 60s rather than tens.
Arch:	A basic form of masonry construction dating back millenia. Brick arches are found spanning over window and door openings in Victorian and older buildings; their disadvantage is that they exert horizontal thrust at their bearings, which sometimes leads to distortion in poorly designed or maintained arches.
Architrave:	Timber moulding around a door frame or similar.
Arris:	A sharp corner at the junction of two planes or surfaces.
Arris rail:	Timber of triangular cross section (made by cutting a square section diagonally), used for fence rails and forming fillets at the junctions of flat roofs and walls.
Ashlar:	Smooth sawn stonework used in a wall.
Axed arch:	A brick arch in which the bricks are cut (traditionally with an axe) to a wedge shape. The mortar joints are of even thickness. As opposed to a rough arch.
Back addition:	Traditional terraced housing originally comprised rooms between the front and rear external walls. When ‘indoor plumbing’ became the rage, extensions were built at the back of the house to contain the bathroom, wc, kitchen and scullery. The rear wing of a house is still called the back addition, even if it was built at the same time as the rest of the house.
Ballast:	Mixed size aggregate.
Batten:	A small timber such as those used to support roof tiles.
Beam:	A horizontal member that carries vertical loads along its length. It would traditionally have been timber (the word originally meaning “tree trunk”) but a modern beam might more often be reinforced concrete or steel. (Fr. poutre, f)
	A steel component designed for use as a beam; “Universal Beam”.
Bench-mark:	A levelling base point of known level. The Ordnance Survey has set up bench marks around the UK. Contractors often establish ‘temporary bench marks’ (‘TBM’) at convenient points around the site.
Bending moment:	The bending force in, for example, a beam. The units of bending moment are those of force x distance, for example, kiloNewton-metres.
Berm:	An earth bank left against a retaining wall during excavation, until it is propped.
Bessemer converter:	A kind of steel-making plant, no longer in use.
Bill of quantities (BOQ):	A list of all the quantities of each component and operation required in a construction project. The BOQ enables all the tenderers to price exactly the same work, and makes it simple to work out the value of the work done at any time during the job. For small jobs the benefit of a BOQ may be outweighed by the cost of producing it.
Blinding:	A layer of concrete covering the ground so that steel reinforcement can be laid out without becoming contaminated.
Block:	Building unit of a regular size usually made of solid or aerated (“aircrete”) concrete.
Blockwork:	Built with blocks.
Bolt:	Threaded fastener used (with a nut and washers) for connecting building components, particularly steel and/or timber.
Bond:	The arrangement or pattern of bricks (or other masonry units) in a wall. Each unit should overlap the unit below by at least one quarter of a unit’s length, and sufficient bonding bricks should be provided to prevent the wall splitting apart. Common bond patterns are Flemish, Stretcher, English and English Garden Wall.
Bonding plaster:	A proprietary type of plaster with good adhesive properties. It must be used with care as it is hygroscopic, i.e. it will readily absorb atmospheric or rising moisture.
Box gutter:	A timber gutter lined with lead or some other waterproof material. (Fr. chèneau (m) encaissé).
Brace, Bracing:	Diagonal members (or rigid membranes) providing rigidity to a structure.
Bressemer, Bresumer etc.:	A timber lintel flush with the surface of the brickwork above it.
Brick:	Building unit of a regular size usually made of baked clay. Can also be calcium silicate or concrete. The standard size of metric bricks in the UK is 65 x 102.5 x 215mm, designed to be used with a 10mm mortar joint. The equivalent theoretical size of imperial bricks, used with a 3/8 inch joint, is 2 5/8 x 4 3/16 x 8 5/8 inches. Clay bricks are of course of great antiquity as evidenced by archaeology and the bible. (Fr. brique, f).
Brick guard:	Steel mesh panel used on scaffolding to make sure that loose bricks cannot fall off the scaffold.
Brick tie:	A metal or plastic component to tie together the two leaves of a cavity wall. Older galvanized ties tend to rust away and have to be replaced.
Bricklayer:	A skilled trade which requires years of training and practice. (Fr. maçon, m).
Brickwork:	Made of bricks. (Fr. maçonnerie, f).
Bucket-handle pointing:	Recessed in the half-round shape of an old-fashioned metal bucket handle.
Building Control:	The first Building Control was introduced, in London, after the Great Fire (1666) when District Surveyors were engaged to enforce the Building Regulations which prevented the spread of fire from house to house – the Regulations had existed before but had often been ignored. The system now covers the whole UK and includes rules on most aspects of building as it affects public safety and health, enforced by Building Control Officers. See links for details. Not to be confused with Town Planning.
Building services:	Plumbing, electrical wiring, ventilation, gas supply and other support systems in a building.

Calcium silicate bricks:	Smooth bricks made by compressing and heating a mixture of sand, or ground flint, and lime. Popular in the mid 20th century but less used now, because of their tendency to shrink.
Camber:	The rise in the middle of a roadway for drainage, or the similar shape given to a beam so that it will become level when loaded.
Cantilever:	Overhanging beam, roof or floor.
Casement:	A window which is hinged rather than sliding.
Cast iron:	A brittle material no longer much used in structural engineering.
Cavity tie:	See brick tie.
Cavity wall:	A wall consisting of two leaves or skins of masonry, seperated by a cavity to enhance water resistance and thermal insulation. A form of wall construction known but rarely used in Victorian times but which came into common use in the 1930s. (Fr. mur (m) à double paroi).
Cement:	A powder which when mixed with water forms a paste that hardens with time. Portland Cement was first patented by Joseph Aspin in 1824 and is known as hydraulic cement, because it will set under water. Cement is mixed with sand to make mortar or render, and with larger stones added it is known as concrete. The sand and stones are there to reduce the shrinkage to which Portland cement is subject and to reduce the amount of cement needed. There are various grades: the usual one is called Ordinary Portland Cement (OPC); others commonly used are rapid hardening and sulphate resisting.
Cement mixer:	Mechanical device consisting of a rotating drum with fixed paddles inside, used for mixing cement with aggregate and water to produce concrete, mortar, or any other cement-based mixture.
Centring:	Temporary supports used when building an arch.
Chain:	Surveyors’ unit of length in the Imperial system. Gunter’s chain, named after its inventor, comprises 22 yards or 66 feet, approximately 20.117 metres. Gunter’s chain is useful for deriving areas in acres. The lesser-known Engineer’s chain, 100 feet long, was used for measuring linear distances, along roads for example.
Channel:	A structural steel component which is C-shaped in cross section.
Characteristic strength:	The strength at which a member tested would fail, normally with 95% confidence.
Cill:	Alternative spelling of sill.
Circular hollow section:	A structural steel component in the shape of a round tube.
Cladding:	The seperately-applied exterior finish of a framed building.
Clamp:	See cramp.
Classical orders of architecture:	The classical orders are styles of building originating from the construction of temples in ancient Greece and Rome. Orders are defined by their varying styles of column, although the orders also include information on the proportions of the building. The Greeks originally had three orders: the Doric, Ionic and Corinthian. Doric is the simplest, Ionic more elaborate, and Corinthian more decorative still. The Romans added the Tuscan and Composite orders which are respectively plainer and more highly decorated than the Greek orders.
Cleat:	A steel plate or angle with holes for bolting, for connecting the components of a steel frame together.
Coarse aggregate:	Any aggregate larger than fine aggregate. Gravel. Available with a maximum size of 10, 20 or 40mm.
Collar:	A horizontal timber joining two opposing rafters together.
Collateral warrantee:	A legal agreement between a developer and a building contractor or designer, allowing the contractor or designer to be made responsible to a third party, such as a finance provider or a purchaser, for the execution of their duties.
Common rafter:	A normal rafter, which extends all the way from wall plate to ridge, as opposed to a jack rafter.
Compasses:	An instrument for drawing arcs and circles. Not to be confused, incidentally, with a compass (in the singular) which is a magnetic instrument for finding North.
Competent person:	Person with sufficient knowledge of the specific tasks to be undertaken and the risks which the work will entail, and with sufficient experience and ability to enable them to carry out their duties in relation to the project, to recognize their limitations, and to take appropriate action in order to prevent harm to those carrying out construction work, or those affected by the work. (Construction Design and Managment Regulations 2007)
Composite order:	One of the ancient classical orders of architecture, introduced by the Romans. Its capital combines the volute scrolls of the Ionic with the acanthus foliage of the Corinthian.
Compression:	The pressing force experienced in a column or in the top flange of a beam.
Computer aided design (CAD):	The type of computer program with which technical drawings are prepared. The market leader is AutoCAD but there are others.
Concrete:	An artifical stone-like substance obtained by mixing large and small stones and sand with cement and enough water to permit full hydration and make the mix workable. Concrete (like the stone minerals from which it is made) is strong in compression but weak in tension. Roman concrete was based, not on Portland cement, but on a ‘pozzolanic’ mix, made from volcanic ash and incorporating ground-up bricks and tiles. (Fr. beton, m).
Concrete pump:	A machine for transporting concrete down a delivery pipe. May be truck mounted or static.
Contract:	Building contracts may legally be formed verbally. Usually however a written contract should be used. There are various standard forms of contract, such as those provided by the Joint Contracts Tribunal and the various engineering institutions.
Contract administrator:	Many forms of building contract specify a Contract Administrator to manage the contract on behalf of the Client. It may be the architect, the engineer, or a specialist such as a project manager. The CA’s main duty is to specify how much the contractor is due to be paid at each stage.
Contract documents:	The contract drawings, bill of quantities, specifications, and any other documents referred to in the contract.
Contract drawings:	The drawings on which the contract is based.
Coping:	Protective capping on the top of a parapet or free standing wall.
Corbel:	Projecting brick or masonry courses; from Norman-French meaning ‘crow’ after carved stone projections used in medieval times to support roof trusses.
Corinthian order:	The most elaborate and decorated of the three ancient Greek orders of architecture, its capital is carved in imitation of the growth of acanthus leaves. According to Roman writer Vitruvius, a young lady of the nobility in Corinth died, and her nurse placed a basket containing her belongings on top of the grave, with a roof tile on top to protect it. An acanthus plant grew right under the basket and its shoots curved and rolled around the corners of the tile. A passing architect noticed this and copied it in stone.
Corrugated iron:	(Corrugated galvanized iron). Iron (or for the last hundred years at least, steel) sheet formed into a ridged shape, used for roofing and cladding.
Coupler, coupling:	A device for mechanically joining two linear components like pipes, scaffold tubes, or a drill bit with an extension.
Course:	A layer of bricks or blocks in a wall.
Cramp (also clamp):	Metal component built into masonry to join it to another member, for example a window frame (‘frame cramp’), or to join two masonry units together.
Crane:	Lifting device which can be fixed or mobile.
Crippled:	Of joists, doubled-up to form a trimmer. (American term.)
Cure:	The hardening of concrete and other cement products. Curing requires a certain range of temperature (more than 6C but not enough to cause thermal stress) and sufficient internal water to combine with the cement.

Dado:	A timber moulding fixed to the wall at waist level.
Damp proof course (DPC):	An impermeable material built into a wall near the ground to prevent rising damp. Types available include lead-based, bitumen-based, or plastic-based. Two courses of impermeable engineering bricks can also be used. The DPC must be at least 150mm above the external ground level.
Damp proof membrane (DPM):	Usually heavy duty polythene, incorporated within floors built on the ground to prevent rising damp.
Dead load:	The weight of the materials which form a permanent part of the structure, as opposed to imposed load.
Deal:	Softwood; a standard piece of softwood used for making joinery.
Design and build contract:	A building contract in which the builder is also responsible for all or some of the design.
Design check:	Evaluation of the design to determine whether it conforms with the design brief and can be expected to provide a safe engineered solution.
Development:	The improvement of land in order to make use of it, e.g. by building structures on it or by adapting existing structures. Development can either be for the developer’s own use, or else speculative, i.e. for profit.
Digger:	Excavators with hydraulic transmission are ubiquitous in groundwork. The first to be produced were made the J C Bamford company.
District Surveyor:	Borough officers first appointed after the Great Fire of London to supervise the Building Regulations. Now combined with the Building Control Officer.
Doric Order:	The simplest of the ancient Greek orders of architecture. The columns consist of a plain fluted shaft and a simple capital; there may be no base or a simple round one. According to Roman writer Vitruvius the order originated with a temple to Juno built by one Dorus.
Dormer:	A window projecting from the slope of a roof.
Dowel:	(Concrete) A steel bar for transferring load across a joint. (Joinery) A timber moulding with a circular cross section.
Dragon beam:	In traditional pitched roof construction, a diagonal tying timber across the corner of a hip.
Drypack:	A strong mixture of cement and sand damped with a small amount of water, used to fill holes in existing walls for example in underpinning.
Ductwork:	Air-handling pipes fabricated from sheet steel.
Dumpy level:	Originally a simple but accurate optical instrument invented in 1832 by English civil engineer William Gravatt. Now applied to any optical levelling instrument used by builders.

Effective length:	A concept used in the design of structural members. May be more or less than the actual length to compensate for the degree of restraint of the ends of the member, a member which is more rigidly held at the ends being stronger.
Engineer:	In English, the term is associated with engines, although this is a historical accident, the first engineers having been military engineers who were responsible for ‘engines of war’ such as tunnels and seige towers. Engineers engaged on public works such as canals, highways and railways called themselves ‘civil engineers’ to distinguish themselves from military engineers. There are now many kinds of engineer. The word itself is unprotected in the UK, so that anybody can call themselves an engineer, such as in the joke job descriptions ‘rodent control engineer’ and ‘domestic engineer’. In France the equivalent word ‘ingenieur’ seems closer to words signifying ingenuity, and is a controlled designation requiring its holder to have appropriate qualifications.
Engineering brick:	A type of brick which is particularly strong and impermeable. The traditional product was blue in colour; other colours and qualities are available.
English Bond:	Alternate rows of bricks consist of all headers and all stretchers. Traditionally considered to be the strongest bond, it is often found in engineering works like bridges and retaining-walls.
English Garden Wall Bond:	Most brickwork bonds are designed so that one side of the wall can be built ‘fair-faced’ (suitable for viewing as finished work); the other side, inside the building, will be plastered so the brickwork can be left rough. Garden walls however will be seen from both sides, so Garden Wall bond is designed with a minimum number of headers so that both sides can be built fair-faced.
External works:	The landscaping, roads and paths created in the parts of the site not occupied by the building.
Extrados:	The upper surface of an arch.

Falsework:	Temporary structure used to support a permanent structure while it is not self-supporting.
Fascia:	In roof construction, a decorative board fixed to the ends of the rafters. Also the name board over a shop-front.
Feather-edge board:	A board which is thicker one side than the other. Used for fencing, where they are fixed vertically and overlapping. Sometimes found in tiled roofs, fixed horizontally, with the thicker edge at the top to provide a hanging point for tiles.
Filler Joist Floor:	An obsolete but commonly-found form of floor comprising a concrete slab reinforced with steel I-beams known as rolled steel joists.
Fine aggregate:	Sand used in making concrete, mortar etc.
Firring:	A piece of timber cut as a wedge and fixed to the top of a joist. Used to give flat roofs a fall for drainage, or to level up uneven floors.
First fix:	Electrical and plumbing first fix are the fixing of the wires and pipes in the fabric of the building, before plastering. Carpentry first fix is the provision of joists, studs and rafters.
Flange:	The top and bottom plates of an I- or H-beam, or of a channel. The top and bottom flanges of a beam are usually in compression and tension respectively.
Flashing:	Lead (or other durable metal sheets) to protect junctions of roofs and walls from water ingress. (Fr. bande (f) de recouvrement).
Flat roof:	A roof with a slope or pitch less than ten degrees from the horizontal.
Flemish Bond:	The most common bond in brickwork 225mm or more in thickness, it consists of alternating headers and stretchers, with each header being in the middle of the stretchers above and below.
Fletton:	The common type of machine-made yellow/orange frogged brick used in the south-east of England and London. Named after Fletton, near Peterborough.
Flint-lime brick:	A kind of calcium silicate brick.
Flitched beam, Flitch:	A timber beam strengthened with one or more steel plates bolted or screwed to it, often sandwiched between timbers.
Flue:	Channel formed with masonry or specially made blocks or pipes through which the products of combustion pass to the outside. Until the middle 20th century, the need to stack flues from storey to storey imposed a discipline on architecture which is now absent.
Fluid Mechanics:	The science of the properties and motion of liquids and gases.
Flush pointing:	Flush with the surface of the bricks.
Foot:	Unit of length in the Imperial system; one-third of a yard, equal to 304.8mm.
Force:	That which can accelerate a mass. An example of a force is weight, which acts to accelerate any mass towards the centre of the earth. Structural engineering is about providing structures which are strong enough to resist the weight and other forces acting on them. In the SI system, force is measured in Newtons.
Foreman:	Trades foremen, for example foreman plasterer, electrician, are in charge of their tradesmen on a site. The general foreman is in charge of the trades foremen. The term does not specify gender.
Formwork:	A mould into which concrete is cast.
Foundation:	The part of a building or structure which transmits loads to the soil. Foundations may be stepped masonry, mass or reinforced concrete, or piled. (Fr. fondation, f).
Frame clamp or cramp:	Metal component screwed to the window or door frame and built into the masonry wall.
Frenchman:	A tool for forming the shape of pointing.
Frog:	The recess in a machine-made brick.
Furlong:	Unit of length in the Imperial system; ten chains, or 660 feet, one-eighth of a mile, equal to 201.168 metres.

Gable:	The triangular wall at the end of a building with pitched roofs. (Fr. pignon, m).
Ganger:	The leader of a work gang, for example, a concrete gang.
Gauge:	A measuring rule. Also, the height of brickwork, specified as the number of courses per foot or per 300mm. In the south of the UK brickwork gauge is almost universally four courses per foot or per 300mm.
Ginny wheel:	Pulley used for hoisting things up a scaffold.
Glass bead:	Moulding used to retain glass in a window frame.
Gram:	Unit of mass in the SI system of weights. Symbol g.
Grating:	Iron or plastic protection over a gully.
Gravel:	Naturally occuring ballast or course aggregate.
Green Roof:	A flat roof covered (deliberately) with growing material.
Groundwork:	Foundations, drainage, levelling and other building operations involving digging.
Grout:	Cement mixed with enough water to make it runny, used to fill a gap under the base of a steel column. Also the filler between wall tiles.
Guarding:	Protection against people or things falling off the edge of stairs, landings, balconies or scaffolds.
Gully:	A container with water in it, to seal the inlet to a drain and prevent the release of noxious gases.
Gutter:	Open channel for receiving and carrying away rain water. (Fr. gouttière, f).

H-section:	A steel component shaped in cross-section like an H, such as a Universal Column (qv).
Half timbered:	A descriptive term for a traditional timber-framed house.
Hammerbeam roof:	A form of historical roof truss, usually comprising a central truss section spanning between two cantilevers.
Handrail:	A length of timber or metal at hand height at the side of a staircase or landing.
Hardwood:	Timber from a deciduous tree; note that hardwood can be softer than softwood, for example balsa wood is a hardwood although very weak and soft. In construction, hardwood may be used in preference to more readily-available softwood because of its higher strength, its greater durability, or its superior appearance. Efforts should always be made to ensure that the timber is from renewable sources. (Fr. bois (m) feuillu).
Header:	A brick whose ‘head’ or short end is visible on the surface of the wall. See stretcher.
Hearth:	Fire resisting area of floor adjacent to an open fireplace.
High alumina cement (HAC):	Concrete made with this type of cement hardens faster than with Portland cement. This advantage once led to HAC being used for manufacturing precast concrete elements, but it has the disadvantage that it tends to become weaker over time especially in a moist atmosphere. The collapse of some swimming pool roofs in the 1970s led to HAC being banned for structural use. It is still used for non-structural purposes, for example, for bedding sanitary ware on a concrete floor.
High strength friction grip bolt:	Used for connecting steel components in situations where it is not desirable for the connection to slip.
High tensile steel:	A grade of steel stronger than mild steel, which may be used both in structural steelwork and concrete reinforcement.
Hip:	A roof feature in which two pitched roofs meet at a corner; the rafter forming such a junction. The hip rafter is not usually a load bearing member. (Fr. arête (f) de croupe).
Hipped roof:	Featuring hips.
Hod:	A three sided container mounted on a pole, used to carry bricks or mortar up a ladder.
Hod carrier:	Bricklayer’s labourer.
Hoist:	An elevator for lifting goods and, usually, people up a scaffold.
Hollobolt:	Proprietary expanding bolt which can be used in making bolted connections to hollow sections, and other situations where lack of access prevents a nut being used.
Hollow section:	A tubular structural steel member, either circular (‘CHS’), rectangular (‘RHS’) or square (‘SHS’). Elliptical hollow sections are also available.
Honeycomb brickwork:	Built with gaps between the bricks, to allow ventilation.
Hundredweight:	In the UK imperial units system, a weight of 112 pounds, also equivalent to eight stone, or one twentieth of a ton.
Hydration:	The process by which cement hardens by reacting with water.
Hydraulic cement:	Cement which sets under water, like Portland cement.

I-section:	A structural steel section shaped like an I, such as a Universal Beam.
Imperial system:	The traditional system of weights and measures used in English-speaking countries until superseded by SI units in a process often called metrication, which took place in the UK in the early 1970s. The principal Imperial elements are yards (with their subdivisions of feet and inches), and pounds (divided into ounces and multiplied into hundredweights and tons).
Imposed load:	The weight of furniture, people, storage, and any other non-permanent loads.
Inch:	Unit of length in the Imperial system; one-twelfth of a foot, equal to 25.4mm.
Intrados:	The underside of an arch.
Ionic Order:	One of the ancient Greek orders of architecture, characterised by a fluted column and a capital consisting of four volute scrolls. Named after Ionia in Greece, where it was first used.
Iron:	An element, which is one of the most common on earth, and the principal component of steel.

Jack rafter:	A rafter that is shorter than a common rafter because it is intersected by a hip or a valley.
Jetty:	In traditional timber-framed buildings, the projection of an upper storey over the storey below. The reason for this form of construction seems originally to have been simply to increase the floor area of the upper storeys.
Jiffy hanger:	A proprietary steel component which enables a joist to be connected to another timber running at right angles.
Joinery:	The fabricated timber components of a building such as doors, windows and staircases. (Fr. menuiserie, f).
Jointing:	The process of finishing the mortar between bricks or other masonry units at the time of building, as opposed to pointing the joint later.
Joist:	(Timber) Horizontal member which is one of a group running parallel and close together, supporting a floor or flat roof. (Fr. solive, f).
Joist hanger:	Proprietary steel component to support the end of a joist so that it does not have to be built into the wall.

Kentledge:	Heavy weights used to counter balance a load or provide a reaction.
Keystone:	The centre stone of an arch, if it is larger than the ordinary voussoirs.
Kicker:	In reinforced concrete construction, a concrete plug typically 50 to 100mm high to help locate the formwork for a wall or column.
Kilogram:	The principle unit of mass in the SI system of weights and measures. Equal to 1000 grams. Abbreviation kg. Approximately equivalent to 2.2046 pounds.
KiloNewton:	One thousand Newtons – the unit of force in the SI system. Newtons are very small, and the kiloNewton is the practical unit most often used by engineers. In imperial terms it is approximately equivalent to the weight of two hundredweights. Abbreviation kN.
King post truss:	Roof truss with a central vertical member.
L:
Labourer:	General labourer: building worker without any specific skill. Specific trades have their own labourers such as bricklayer’s, plasterer’s, labourer, whose job is to set up scaffolds and carry materials.
Lacing:	Generally horizontal members that connnect together and reduce the unsupported length of compression members.
Laminated strand lumber (LSL):	A type of reconstituted timber made of seperated strands glued together under pressure.
Lath:	A thin strip of wood nailed to studs or joists as a carrier for plaster. Early laths were riven (split with a blade); in more modern times they were sawn. Expanded metal lathing (e.m.l.) is used for the same purpose, especially for external work with sand and cement render; internally, laths have been superseded by plasterboard.
Ledger:	In scaffolding, the horizontal members running along the scaffold. They support transomes or putlogs.
Level:	Horizontal; the instrument used for checking whether things are horizontal. Levels on a drawing are heights above a recognised datum which might either be the Ordnance Datum or a local datum for the job, whose location and value has to be specified on the drawings.
Levelling:	Finding levels during surveying, or providing levels for new construction.
Lewis:	A device consisting of expanding wedges used for lifting heavy stone masonry.
Lift pit:	Every lift has (by law) to have a clear space below its lowest landing level, fitted with equipment intended to bring to a safe halt a lift which has failed to stop. This often requires a lift pit, typically 1.2 to 1.5m deep.
Lime Mortar:	The traditional form of mortar, it is soft and flexible and liable to dissolve slowly in rain water. It is still available for use in restoration work.
Lintel, lintol:	A short beam over a door or window opening; may be steel, concrete or, traditionally, timber. The spelling with an ‘o’ is traditionally favoured by draughtsmen; the ‘e’ however is given authority by the King James bible (Exodus 12:22 etc). (Fr. linteau, m).
Live load:	Imposed load.
Load bearing:	Designed to support a load in addition to its own weight.
Load factor:	Engineers design structures to support loads which are more than the maximum load expected. The actual loads are calculated as accurately as possible and then multiplied by the factor. Typical load factors are 1.4 for dead loads and 1.6 for imposed loads.
London stock:	The stock bricks made in the London area for centuries.

Manhole:	Hole in the ground to allow access to underground services; access chamber.
Mansard:	A roof which slopes steeply (e.g. 15 degrees from the vertical) to allow more space inside the roofspace. Named after a French architect.
Masonry:	In general usage this describes work constructed of stone, but technically the term masonry also includes brickwork and blockwork. (Fr. maçonnerie, m).
Mass:	A property of all matter. It is measured in, for example, grams. Mass is independent of gravity, unlike weight which depends on gravity.
Mass concrete:	Unreinforced concrete, as often used in foundations or other applications where the added strength of reinforcement is not required.
Maul:	Large wooden hammer used in masonry and paving work.
Method statement:	A document which shows how the construction will be carried out safely. Under most forms of contract the Contractor will prepare any necessary method statements and the Engineer will usually check them. Method statements are also sometimes required by neighbouring owners where potentially hazardous work is being proposed, or by Planning authorities to ensure that a proposal is buildable.
Metre:	The basic unit of length in the SI system of weights and measures. Multiplied and divided by 1000 to give derived units such as millimetres and kilometres. Symbol m. In the USA the spelling meter is used. A metre is approximately equivalent to 3ft, 33/8 inches.
Metric:	The UK construction and engineering industries were encouraged by the Government to adopt the metric system in the early 1970s. The system used was and remains (rather shortsightedly) based on millimetres rather than the centimetre system taught in schools in the UK and around the world. See SI system.
Mews:	In London and other large cities, the stables belonging to large houses would often be accessed from a small road running along the backs of the properties, known as the mews. The mews properties are often separated from their main house and converted to sought-after dwellings.
Mild steel:	Structural steelwork and reinforcement generally come in two qualities: mild steel and high-tensile steel, the latter being stronger but more expensive.
Mile:	Unit of length in the Imperial system; 1760 yards, equal to 1609.344 metres.
Mix:	The proportions of the ingredients of concrete, mortar and such like.
Mobile crane:	Versatile lifting devices in a range of sizes, usually telescopic.
Mock Tudor:	An architectural style popular in suburban development in the twenties and thirties, in which traditional styles were copied poorly.
Modulus of elasticity:	A measure of the amount by which something can be deformed by a force and recover when the force is removed.
Moment:	Short for bending moment. The bending force which acts on, for example, a beam, and is resisted by an equal internal resistance moment within the beam.
Mortar:	A binder for masonry. The traditional product was Lime Mortar; modern mortars rely upon cement mixed with sand, with the addition of lime or plasticizer added to make them workable or ‘buttery’. (Fr. mortier, m).
Mortice and tenon joint:	A traditional way of joining two timbers at right angles: the one coming in from the side is reduced to a tenon, which fits into the cavity or mortice and is secured by glue or nailing.
Moulding:	Timber (or other material in imitation of timber) shaped into a pattern and used for decorative details such as skirting, picture rail and so on. Traditional moulding shapes include quadrant, ogee, torus, chamfered, glass bead, half round, dowel and so on.
Moulding pin:	A very thin pin or nail used for securing mouldings.

Needle:	As a noun, a short beam introduced through a wall to provide temporary support while the wall is being re-supported. As a verb, to insert such beams.
Neutral axis:	The point near the middle of a beam’s cross-section which experiences neither tension nor compression when the beam is subjected to bending.
Newlyn datum:	See Ordnance datum.
Newton:	The principal SI unit of force. It can be thought of as equivalent to the weight of Sir Isaac Newton’s apple.
Node:	Theoretical point where two or more members are considered to be connected together.
Noggin (or nogging, naggin etc):	A short length of timber fixed crossways between joists, studs or rafters; also the infill between the studs of a traditional timber-framed building.
	Also, the brickwork or other infill between the studs of traditional timber-framed construction.

Ordnance datum (OD):	The national leveling standard for the UK, the basis for levelling set up by the Ordnance Survey, representing mean sea level at Newlyn, S Wales.
Ordnance Survey:	The organisation which makes and maintains accurate maps of the United Kingdom. The maps were originally for military purposes but are now used for land use planning and development of land.
Oriel window:	A bay window that projects from the wall and does not have its own foundations.

Padstone:	A block of concrete or stone used to spread the weight of a beam or joist, to avoid crushing the wall upon which it rests.
Parallel flange channel:	A form of steel channel.
Pargetting or pargeting:	(pronounced pargeing). Rendering, especially (1) decorative sculptured rendering on the outside of a building, found mainly in East Anglia (2) the render (traditionally consisting of cow manure) lining the inside of a flue, formed into a cylindrical tube by pulling up an iron sphere on a chain.
Partition:	A non load bearing wall between rooms or areas in a building. Partitions may be of any material but are often studwork.
Party wall:	A wall shared between two buildings. Laws have existed for many years, particularly in London but now throughout the UK, for governing the building, alteration and maintenance of party walls. (Fr. mur (m) mitoyen).
Pea shingle:	Shingle consisting of rounded stones that pass through a 10mm grid.
Permissible stress:	Stress that can be sustained safely. Codes of Practice for structural design used to specify permissible stresses with which the actual stress was to be compared.
Perp.:	The vertical mortar joint between two bricks (bricklayers’ slang).
Picture frame:	In structural engineering, a rectangular steel frame consisting of two columns and two beams, sometimes used when a load bearing wall has to be removed.
Pier:	A masonry column; a jetty.
Pile:	A foundation consisting of a deep column extending down into the ground, used when the foundation needs to get support from a deeper and stronger or more stable layer. Originally piles were timber (often elm) but they can now be concrete or steel or even aluminium. Bored piles are made by pouring concrete into a hole drilled in the ground whereas driven piles are ready-made and driven into the ground. There are many ingenious proprietary piling systems and piling can be used both for new buildings and for strengthening or stabilising the foundations of existing buildings. Contiguous piles are used to form a retaining-wall.
Pile cap:	A (normally reinforced concrete) structure transferring loads from the building into the piles.
Pile driver:	Machine for hammering or forcing piles into the ground.
Piling rig:	A machine which drills a hole in the ground for a cast-in-situ pile.
Pitch:	Of roofs, the angle of the rafters from the horizontal. Traditionally the pitch was expressed as the number of vertical inches corresponding to twelve horizontal inches, thus a 45 degree roof was described as a twelve inch pitch.
Pitched roof:	One whose slope exceeds ten degrees.
Planning:	The legal system, operated and enforced by local authorities, by means of which the development of land is controlled for the public good. Not to be confused with Building Control.
Plaster:	The material which is spread to leave a smooth surface on a wall or ceiling. The main binding material may be cement (when it is known in the UK as render), or lime, or gypsum, the latter two being restricted to internal use; in any case there will be a filler of sand, or in proprietary prepackaged plasters, powdered vermiculite. (Fr. plâtre, m; enduit (m) interieur).
Plasterboard:	A sandwich made of two sheets of cardboard with a gypsum plaster filling, typically 9mm or 12mm thick. Nailed or screwed to studs, joists or rafters as a carrier for a plaster skim finish, or plasterboards with chamfered edges can be jointed so that they act as a finish without being skimmed with plaster. Plasterboard helps to provide the resistance to fire of buildings. (Fr. placoplâtre, m, from a trade name).
Plum:	A large stone or piece of solid concrete used as a filler in mass concrete.
Plumb:	Vertical or verticality, measured using a plumb-line or plumb-rule or these days a spirit level.
Pointing:	The surface treatment of the mortar between bricks or other masonry units. There are various styles of pointing: flush, struck and weathered, recessed, tuck, bucket handle etc. (Fr. jontoiement, m).
Poling board:	A short strong board used in the temporary timbering of excavations and tunnels.
Portal frame:	A structural frame consisting of two columns and a cross- beam, with rigid connections. Often used for single-storey warehouses and workshops. The cross-beam is often formed as two rafters to make a pitched roof shape.
Portland cement:	A hydraulic cement used almost universally for making concrete and other cement based products. So-called because concrete made with it resembles limestone from the Isle of Portland.
Post stressed concrete:	Concrete strengthened with steel wires which are stressed after the concrete has cured.
Pound:	The unit of mass in the imperial system of weights and measures. Confusingly, the same word is also used sometimes for a unit of force, more accurately called a pound-force. The UK’s unit of currency called a pound was originally the value of a pound of ‘sterling’ silver.
Poundal:	A unit of force in the imperial system of weights and measures.
Precast concrete:	Concrete components made in a factory or yard and transported to the site.
Prestressed concrete:	Concrete strengthened with steel wires which are stressed before the concrete is poured.
Professional indemnity:	Insurance against claims against a professional person or practice.
Progressive collapse:	The process wherein the collapse of part of a building leads to the collapse of an adjacent part in ‘house of cards’ fashion.
Pugging:	Traditional infill between timber floor joists intended to enhance the acoustic insulation of the floor. It may occupy the whole depth of the floor or only part of it. Materials used include sand, mortar, concrete, straw and sea shells.
Pulverised fuel ash:	A fine white powder resulting from burning powdered coal in power stations, which can be used to supplement cement in making concrete for civil engineering works.
Purlin:	A horizontal structural member which supports a sloping roof covering, with or without rafters, and which carries the roof loads to the primary framing members. (Fr., panne, f).
Putlog or putlock:	A horizontal scaffold member one end of which is built into the wall. Putlog scaffolds are not much used these days because they can be dangerous, and because the hole in the wall has to be repaired when the scaffold is taken down. (Fr. boulin, m).

Quadrant:	A quarter of a circle. The name is also used for various things in this shape, such as a timber moulding, a corner kerbstone, or a historic navigational instrument.
Queen post truss:	A truss with two posts directly supporting the purlins.
Quoin:	The external corner where two brick walls meet.

Rafter:	Sloping structural member supporting a roof. (Fr. chevron, m).
Ready-mixed concrete:	Mixed in a batching plant and delivered in ready-mix trucks.
Recessed pointing:	Flat pointing set back from the surface of the bricks.
Rectangular hollow section:	A structural steel component in the shape of a steel tube with a rectangular cross section.
Reinforced concrete:	Concrete reinforced with steel bars to make a versatile structural material which is very strong in bending, shear, tension and compression, unlike plain concrete which is strong only in compression.
Reinforcement:	(Also known as rebar). Steel bars for reinforcing concrete. They are bent into special shapes according to the Engineer’s bending schedule, and fitted into the correct position by a skilled operative called a steelfixer.
Render:	Cement-based wall plaster.
Retaining wall:	Retains soil on one side. May be made of masonry, reinforced concrete, or various other traditional or proprietary structural systems.
Retention:	A percentage withheld from a contractor’s payment until an agreed time after the work is complete.
Ridge:	The top of a pitched roof, where roof planes that slope in opposite directions meet. (Fr. faîte, m).
Ridge board:	A thin timber used to align the tops of the rafters. In most roofs the ridge board is not a load bearing member. (Fr. planche (f) faîtière).
Ridge tile:	A curved tile which covers the ridge on a pitched roof.
Riser:	Vertical board rising from the back of one tread of a staircase to the front of the next.
Rising damp:	Water soaking up through the walls of the building. May be prevented by the use of a damp proof course in the walls.
Rivet:	Before structural steel I and H sections became available engineers made up sections by joining narrow plates together using steel rivets with a head formed by hammering while red-hot. Rivets are no longer used for connecting structural steelwork in the UK, with fabrications mostly replaced by ready made sections, and with bolting and welding available which are both faster and safer for connections. The presence of rivets in an existing structure can help in dating it, and usually indicates steelwork dating to before about the 1950s.
Rolled steel joist (RSJ):	One of a range of I- and H-shaped steel members. Only small sizes of joist are still produced, most of the larger sizes having been replaced by Universal Beam and Universal Column sections. RSJs were originally devised for use in filler-joist construction.
Rough arch:	A brick arch in which the bricks are rectangular and the arch shape is formed by means of the mortar joints being wedge-shaped. (cf ‘axed arch’).

Sand:	Aggregate consisting of mineral particles whose size is generally less than 5mm; fine aggregate. Merchants in the UK supply soft sand and coarse or fine sharp sand.
Sand-lime brick:	A kind of calcium silicate brick.
Sash window:	The traditional type of window which opens by sliding up and down. The frame is called a box-frame, because the side members are hollow wooden boxes inside which the counterweights slide up and down. The biggest problems with them are that over-zealous painting leaves them jammed shut, and the sash-cords have frequently to be replaced. Modern versions are available incorporating draught proofing and springs instead of weights.
Scaffold:	A framework for temporary access to building works. The traditional way to build a scaffold in the UK used to be with timber poles connected together with wire bonds. Standardised 1 15/16 inch (49mm) steel tube with proprietary steel connectors came into widespread use after the second world war, based on war surplus tubing that had been used in beach defenses. Various proprietary scaffolding systems are also available and may cost less, but “tube and fittings” scaffolding has the advantage of flexibility. (Fr. échafaudage, m).
Scaffold board:	Timber boards used to make walkways on a scaffold.
Scantling:	The cross-sectional dimensions of a length of timber; the principal dimensions of a shaped stone; a piece of timber of a specific size.
Scarf:	A traditional woodworking joint for extending the length of a timber.
Screed:	A temporary rail, installed at a specific level, to enable concrete to be finished at the correct level. Also sand and cement, mixed rather dry, laid on a (usually concrete) floor and screeded and trowelled to make a smooth surface. (Fr. chape, f).
Screw:	Threaded fastener.
Secant piles:	Contiguous piles where each pile cuts into the one before, to make a more-or-less waterproof retaining-wall.
Second fix:	(See first fix). Work which takes place after plastering, for example, fixing light switches, skirtings.
Services:	See: Building services.
Setting-out:	The process of making sure that a building or structure is built in the correct position and the right size.
Settlement:	The small downwards movement of foundations when the weight of the building comes onto them, due to compression of the soil. Tends to be negligible in clay soil but can be significant in sand. (Fr. tassement, m).
Shake:	A defect of timber: damage caused by rough handling.
Sharp sand:	Sand which, unlike soft sand, does not include fine silt or clay particles, making it more suitable for use in concrete and screed.
Shear or shear force:	The force which tends to make the top and bottom flanges or fibres of a beam move parallel to one another. The web of the beam resists the shear force, which is at its greatest at the ends of the beam next to where it rests on its supports.
Sheerlegs:	A lifting device using two timber poles fixed together at the top.
Shingle:	Aggregate consisting of stones whose size is between 5 and 10mm. Also, a wooden roof tile.
Shuttering:	Formwork.
Sill:	Projecting moulding at the bottom of a window or door. (Also spelled cill).
Simply supported:	Describes a beam which rests on a support at each end, that is, it is not supported at more than two points, is not held rigidly by the supports, and does not form part of a larger framework.
Skirting:	Timber or other moulding around the base of a wall.
Sleeper wall:	Supports a timber ground floor, and is often built in honeycomb brickwork to allow ventilation of the space under the floor.
Soaker:	A metal sheet bent at a right-angle, part of the waterproof flashing of the junction of a tiled or slated roof abutting a wall.
Soffite:	The underside of a building component such as a lintel or beam. A board fitted to the underside of the ends of rafters or flat roof joists.
Soft sand:	Sand which includes fine silt or clay particles, which make it more suitable for making mortar or render than sharp sand.
Softwood:	Timber from a coniferous tree, i.e. most of the timber used in construction. Softwood timber comes in a variety of grades, the most common for structural use being classes C16 (for general use) and C24 (stronger timber with fewer knots and defects). (Fr. bois (m) resineux).
Soil:	In engineering, the soil is all the solid materials below the earth’s surface, including rock, sand, clay and so on.
Soil Mechanics:	The science of the strength of soil.
Soldier:	A vertical member in a retaining-wall, especially in temporary works.
Sole plate:	A timber placed on the floor as the base for a partition.
Special (brick):	A brick specially made in a non-standard shape.
Special foundations:	Defined, in the Party Wall act, as foundations incorporating steel.
Spine wall or partition:	In traditional domestic construction, a load bearing partition between the front and rear rooms of the house. It supports the upper floors and, usually, the roof.
Splice:	A steelwork connection for joining (for example) two lengths of column to form a longer column. Beams can also be spliced, but the splice must not, if possible, be in the middle of the beam where the bending moment is greatest.
Springing:	The masonry supporting an arch.
Square:	Rectangular, or at a right angle; the tool used for checking rectangularity.
Square hollow section:	A structural steel section in the shape of a square tube.
Squint:	A special brick for use on a corner which is not a right-angle.
Stanchion:	Steel column.
Standard:	A vertical tube in scaffolding.
Steel:	A metal based on iron, with the addition of carefully defined quantities of carbon and other elements to produce a metal with specific qualities. Structural steel is used for steel frames and is weldable and easily cut and shaped. Steel reinforcement (qv) is designed to be cut and bent to shape. Modern steel use dates from the invention of the Bessemer converter, and the modern product differs from the older types of steel from which weapons were made. (Fr. acier, m)
Steel angle:	A structural steel component, the cross section of which is L-shaped.
Steelfixer:	A worker who specialises in placing reinforcement for reinforced concrete.
Stepped flashing:	Metal flashing cut in a stepped pattern to waterproof the junction of a tiled or slated roof with a brick wall.
Stock brick:	The traditional handmade brick without a frog, made by moulding clay in a wooden mould or ‘stock’.
Strain:	The amount by which something has changed length, measured as a percentage of its original length.
Strap:	A component, usually steel, installed to ensure that walls are connected to and restrained by floors.
Stress:	Force divided by area, measured in (for example) Newtons per square millimetre, or pounds per square foot.
Stress graded:	(Of timber) tested and marked with a strength grade. The two grades of softwood most used in construction are C16 or General Structural grade, and C24 or Special Structural grade.
Stretcher:	A brick whose longest side is visible on the surface of the wall. See header.
Stretcher bond:	A brickwork bond consisting only of stretchers, suitable for half-brick thick walls and cavity walls.
Stringer:	Angled structural beam supporting the treads and risers of a staircase.
Strike:	Dismantle (scaffold or falsework).
Struck and weathered pointing:	Finished with a sloping surface, recessed slightly at the top and protruding slightly at the bottom of the joint.
Structural Engineering:	A branch of engineering dealing with structures, such as buildings and bridges. In the UK structural engineers became distinguished from Civil Engineers when they started to specialise in the new structural material reinforced concrete in the early 20th century, although they soon began to work in all structural materials.
Structural glass:	Glass used in situations where it will or may support more than just its own weight. Glass balustrades, stairs and floor panels are becoming common.
Structural steelwork:	A frame of steel sections supporting other parts of the structure.
Stucco:	Rendering shaped and painted to resemble ashlar stonework.
Stud:	A timber post in a studwork partition or in traditional timber-framed construction. There are also steel studs made of lightweight galvanized steel.
Studwork:	A type of partition formed from studs at close intervals, traditionally clad with lath and plaster, now with plasterboard.
Subsidence:	A downwards movement, especially a movement of foundations. The term is most often used to describe the movement of foundations on clay soil, when the soil shrinks due to becoming drier. (Fr. affaissement, m).
Sulphate/sulfate:	Sulphates in soil or ground water can damage cement- based blocks, mortar or concrete. Special sulphate-resisting cement can be used to resist it. Sulphates in the ground are often a result of industrial pollution.
Systeme international (S.I.):	The system of units, based on the metre, kilogram and second, used by engineers in the UK and elsewhere. The metre and kilogram are divided and multiplied by 1000 to make larger and smaller units. Many think it is an odd system which is based on a unit, the kilogram, which is itself a multiple of another unit, being 1000 grams.

Temporary bench mark:	A levelling base point of known level. See bench mark.
Temporary works:	Propping or shoring to enable the permanent works to be carried out.
Tension:	A pulling force, such as that experienced by a cable, or in the bottom flange of a beam with a load on it.
Theodolite:	An optical instrument used by land surveyors for surveying and by engineers and builders for setting-out lines and angles on the ground.
Tie:	Any member which provides a tensile force to tie two other members together, especially, the bottom horizontal member of a roof truss, and (in a steel framed structure) steel beams whose main function is to tie columns together.
Tile:	Ceramic unit for wall decoration or roof weathering.
Timber:	Wood suitable for use in construction. In the UK it is usually softwood. (Fr bois, m).
Timber connector:	Various kinds of steel fixings designed to make high-strength connections in timber construction.
Timber-framed:	Construction in which the main load bearing elements are timber. Traditional timber-framed or ‘half-timbered’ houses are one example; modern timber framing uses timber load bearing panels made of studwork clad with plywood.
Ton:	Unit of mass or weight in the imperial system of weights. The UK or ‘long’ ton is equal to 20 hundredweights, 2240 pounds, or 1016 kg. In the US a ‘short ton’ of 2000 pounds is used.
Tonne:	Unit of mass in the SI system. Equal to 1000 kilograms.
Top plate:	A horizontal timber on top of a partition to receive the floor or roof timbers.
Tower crane:	A crane with the jib mounted at the top of a tower, to give clearance over obstructions. They may be static or tracked, with a rigid or ‘luffing’ (vertically hinged) jib. They are usually electrically operated.
Town planning or town and country planning:	The original name of the discipline and process which is these days generally known simply as planning.
Trade:	The various types of construction workers: electricians, carpenters, joiners and such like.
Tread:	A single step of a staircase.
Transome:	A component of scaffolding: a horizontal tube supporting the boards. Also a horizontal member in joinery, for example the part of the frame between an upper and lower window.
Tree preservation order:	An order under planning regulations, protecting a tree or group of trees from damage.
Trimmer:	A joist which carries extra loads, for example, those due to an opening or a partition. Trimmers should be stronger than the normal joists. Traditionally they were thicker, these days extra strength is achieved by bolting two or more timbers together.
Truss:	An arrangement of steel or timber components designed to span across a large distance to support a roof, floor or bridge.
Trussed rafters:	Wooden trusses, usually triangular in shape, spanning between the external walls at 600mm centres or thereabouts to form a roof. They are cheap and easy to use for new roofs and do not require internal support from beams or partitions, but their disadvantage is that they restrict the use of the loft space more than conventional ‘cut timber’ roofs.
Tuck pointing:	A difficult and expensive form of pointing. The joint is flush pointed with mortar coloured to match the bricks, and a very thin false joint is cut into the mortar and pointed in lime putty of a contrasting colour. Very difficult to get done today – the art is nearly lost.
Tuscan order:	The plainest of the five classical orders of architecture, similar to the Doric but with a plain rather than fluted shaft.
Tusk tenon joint:	Traditional timber connection, typically used to connect trimmers around a hearth. The tenon extends through the main joist and is fitted with a wooden wedge to stop the joint from opening up. In modern construction a steel bracket would be used instead, unless one were restoring a historical building.

Underpinning:	Making existing foundations deeper (by extending them downwards). Usually done with mass concrete but other high- and low-tech methods are available.
Universal Beam:	A standardised steel component which is I-shaped in cross section. Over 70 different sizes are available in two main steel grades. The Universal Beam and Universal Column were introduced in the late 1950s and were based on American patterns, and rolled in new ‘universal’ rolling mills. They replaced a range of sections which had been developed by various UK manufacturers over the preceding century.
Universal Column:	A standardised steel component which is H-shaped in cross-section. About 30 different sizes are available in the UK, in two main steel grades. The same comments apply as to Universal Beam above.

Valley:	The meeting of two roof planes at an internal angle; the rafter which forms the junction.
Valuation:	Building work is valued monthly by the Quantity Surveyor or Contract Administrator.
Vanity unit:	Washbasin built in to the top of a cupboard.
Variation:	A change to the building contract due to an instruction issued by the Contract Administrator.
Vault:	An ancient form of construction consisting of masonry formed in an arched shape.
Vermiculated:	Of stonework: carved in a random pattern fancifully comparable with the appearance of worms.
Vermiculite:	An expanded mineral used as lightweight aggregate in concrete and other filling applications.
Vierendeel girder:	A type of truss consisting of vertical and horizontal members arranged like a ladder on its side.
Voussoir:	One of the stones or bricks forming an arch.

Waling:	Horizontal steel or timber member in a retaining-wall, especially in temporary works.
Wane:	A defect of timber. The timber section is too small because it was cut too close to the edge of the trunk.
Web:	The middle plate of an I-beam, H-beam or channel. The web connects the two flanges, and resists shear forces.
Weight:	A force resulting from the effect of gravity on a mass.
Welding:	A technique for joining steel components by the deposition of small drops of molten steel which bonds to the parent metal.
Wind load:	Engineers have made great efforts to understand wind loading since the Tay Bridge disaster in 1879.
Withes:	(Pronounced whiffs)The usually half-brick thick dividers between flues in a chimney.
Woodscrew:	Threaded fastener for use in wood.

Yard:	The principal unit of length in the Imperial system; three feet, equal to 914.4mm.
Young’s modulus:	A measure of the elasticity of a material. Defined as stress divided by strain; see modulus of elasticity.

by PipeAdmin
Tags: acronyms, structural

Feb 8, 2018

Acronyms – Nuclear

abbrev	define
AA	access authorization
AAA	Agency Allegations Advisor
AAAC	Affirmative Action Advisory Committee
Aac	alternate ac
AACC	American Association for Contamination Control
AAEC	Australian Atomic Energy Commission
AAECS	auxiliary area environmental control system
AAEGTS	auxiliary area emergency gas treatment system
AAHP	American Academy of Health Physics
AAM	airborne activity monitor
AAPM	American Association of Physicists in Medicine
AAR	Aktiebolaget Atomenergi Research Reactor
AARR	Argonne Advanced Research Reactor
AASHTO	American Association of State Highway and Transportation Officials
AATN	Asociación Argentina de Tecnología Nuclear (Argentina)
AB	auxiliary boiler
ABACC	Argentine-Brazilian Agency for Accounting and Control of Nuclear Material
ABB-CE	Asea Brown Boveri-Combustion Engineering, Inc.
ABCC	Atomic Bomb Casualty Commission
ABET	Accreditation Board for Engineering and Technology
ABFS	auxiliary building filter system
ABGTS	auxiliary building gas treatment system
ABHP	American Board of Health Physics
ABHX	air blast heat exchanger
ABI	auxiliary building isolation
ABLE	activity balance line evaluation
ABMA	American Boiler Manufacturers Association and Affiliated Industries
ABNP	Alan R. Barton Nuclear Plant
ABR	as-built reconciliation
ABRR	as-built reverification record
ABST	auxiliary building sump tank
ABSVS	auxiliary building special ventilation system
ABT	automatic bus transfer
ABV	auxiliary building ventilation
ABWR	advanced boiling-water reactor
ABWRP	American Boiling Water Reactor Program
AC	acid concentrator
A&C	adequacy and compatibility
AC	administrative control advisory committee air conditioning allegations coordinator
ac	alternating current
A/C	air conditioning
A-C	Allis-Chalmers Corp. or Allis-Chalmers Manufacturing Company
ACA	Arms Control Association
ACAD	air containment atmosphere dilution
ACB	air-operated circuit breaker Ateliers et Chantiers de Bretagne (France)
ACC	accumulator air-cooled condenser
ACCWS	auxiliary component cooling water system
ACDA	Arms Control and Disarmament Agency
ACEC	Ateliers de Constructions Electriques de Charleroi, S.A. (Belgium)
ACF	acid concentrator feed ampacity correction factor automatic control feature
acfm	actual cubic foot/feet per minute
ACHP	Advisory Council on Historic Preservation
ACI	American Concrete Institute automatic closure and interlock
ACIWA	ac-independent water addition
ACL	access control list alternate concentration limit
ACLP	above-core load pad above-core load plane
ACM	alternate contact mode auxiliary cooling method
ACMUI	Advisory Committee on the Medical Uses of Isotopes (NRC)
ACNFS	Advisory Committee on Nuclear Facility Safety (DOE)
ACNP	American College of Nuclear Physicians
ACNS	Advisory Committee on Nuclear Safety (Canada)
ACNW	Advisory Committee on Nuclear Waste (NRC)
ACORN	Association of Community Organizations for Reform Now
ACOT	analog channel operational test
ACP	auxiliary control panel
ACPDS	Advisory Committee on Personal Dosimetry Services (NSF)
ACPR	advanced core performance reactor advanced core pulsed reactor annular core pulsed reactor
ACR	advanced converter reactor attribute coverage report
ACRE	advanced compact reactor experiment
ACRG	Advanced Code Review Group (NRC)
ACRI	Air Conditioning and Refrigeration Institute
ACRR	annular core research reactor
ACRS	Advisory Committee on Reactor Safeguards (NRC)
ACS	Advanced Computer System alternate core spray American Chemical Society auxiliary cooling system
ACSNI	Advisory Committee on Safety of Nuclear Installations (U.K.)
ACTIVITIES	automated commitment tracking system
ACU	air cleanup unit
AD	assistant director
A/D	analog to digital
ADAMS	Agencywide Documents Access and Management System
ADAS	automatic data acquisition and storage
ADC	authorized derivative classifier
ADDS	applied digital data system
ADEA	Association Belge pour le Développement Pacifique de l’Energie Atomique (Belgium)
ADFCER	Assistant Director for Fuel Cycle and Environmental Research
ADI	Applied Dynamics International
ADM	Administration, Office of (NRC)
AND	apparent discrepancy notification
ADP	automated data processing
ADPE	automatic data processing equipment
ADR	audit discrepancy report
ADRS	automated data retrieval system
ADS	automated data system automatic depressurization system automatic dispatch system
ADT	aerated drain tank
ADU	ammonium diuranate
ADV	atmospheric dump valve
AE	acoustic emission	air ejector	architect-engineer
A/E	architect-engineer
A-E	architect-engineer
AEA	Atomic Energy Act of 1954 Atomic Energy Authority
AEB	Atomic Energy Bureau (Korea) auxiliary equipment building
AEC	Alternative Energy Coalition Atomic Energy Commission, U.S. (Became ERDA and NRC)
AECB	Atomic Energy Control Board (Canada)
AECC	Aerojet Energy Conversion Co.
AECL	AECL Technologies Atomic Energy of Canada, Ltd.
AECLT	Atomic Energy of Canada, Ltd., Technologies
AECM	Atomic Energy Commission Manual
AECPR	Atomic Energy Commission Procurement Regulation
AEDE	annual effective dose equivalent
AEE	Atomic Energy Establishment (Libya)
AEEN	Agenzia Europea per l’Energia Nucleare Agence Européenne pour l’Energie Nucléaire
AEEW	Atomic Energy Establishment of Winfrith (United Kingdom)
AEF	Argonne Experimental Facility
AEGTS	annulus exhaust gas treatment system
AEI	Associated Electric Industries Ltd. (United Kingdom)
AEN	Agence pour l’Energie Nucléaire (France)
AENJ	Atlantic Electric of New Jersey
AEO	Atomic Energy Organization (Iran)
AEOD	Analysis and Evaluation of Operational Data, Office for (NRC)
AEOF	alternate emergency operations facility
AEOI	Atomic Energy Organization of Iran
AEOR	Annual Environmental Operating Report
AEP	American Electric Power Co., Inc.
AEPSC	American Electric Power Service Corp.
AERCW	auxiliary essential raw cooling water
AERE	Atomic Energy Research Establishment (United Kingdom)
AERO	Association for Excellence in Reactor Operations
AES	aerospace and electronic systems
AESJ	Atomic Energy Society of Japan
AETR	advanced engineering test reactor advanced epithermal thorium reactor
AF	alternating field auxiliary feed auxiliary feedwater
AF/AL	as found, as left
AFAS	auxiliary feedwater actuating system
AFB	Air Force base
AFBMA	Anti-Friction Bearing Manufacturers Association, Inc.
AFC	automatic flow control
AFD	acid fractionator distillate axial flux difference
AFDC	auxiliary feedwater discharge cross-connection
AFDS	automatic fire detection system
AFI	Air Filter Institute
AFL	active fuel length
AFNE	Americans for Nuclear Energy
AF	NETFAir Force Nuclear Engineering Test Facility
AFO	auxiliary fuel oil
AFOS	auxiliary fuel oil system
AFP	auxiliary feedwater pump
AFR	acid fractionation recycle acid fractionator recycle away from reactor
AFRRI	Armed Forces Radiobiology Research Institute
AFS	auxiliary feedwater system
AFSR	Argonne Fast-Source Reactor
AFW	auxiliary feedwater
AFWAS	auxiliary feedwater actuation system
AFWC	auxiliary feedwater control
AFWS	auxiliary feedwater system
AG	Aerojet-General Corp.
AGA	automatic gas analyzer
AGC	advanced gas centrifuge
AGCR	advanced gas-cooled reactor
AGC	Aerojet-General Corp.
AGL	above-ground level
AGMA	American Gear Manufacturers Association
AGN	Aerojet-General Nucleonics
AGNS	Allied-General Nuclear Services
AGR	advanced gas-cooled reactor
AGS	alternating gradient synchrotron	annular gas system
AGU	American Geophysical Union
AGVC	automatic governing valve control automatic governor valve control
AGW	accident-generated water
AGZ	actual ground zero
A/H	air handling
AHFR	Argonne High-Flux Reactor
AHJ	authority housing jurisdiction
AHM	auxiliary handling machine
AHPA	Archeological and Historic Preservation Act
AHR	aqueous homogeneous reactor
AHTG	ad hoc task group
AHU	air-handling unit
AI	artificial intelligence Atomics International authorized inspector
AIA	authorized inspection agency
AICE	American Institute of Chemical Engineers
AID	accident identification display Agency for International Development air inlet damper
AIEE	American Institute of Electrical Engineers
AIF	Atomic Industrial Forum, Inc. (now NEI)
AIG	antitrust and indemnity group
AIGS	auxiliary inerting gas subsystem
AIHA	American Industrial Hygiene Association
AIHX	auxiliary intermediate heat exchanger
AIMME	American Institute of Mining and Metallurgical Engineers
AIMMPE	American Institute of Mining, Metallurgical, and Petroleum Engineers
AIMS	automated information management system automatic isotopic measurement system
AINSE	Australian Institute of Nuclear Science and Engineering (now ANSTO)
AI&O	annual inspection and overhaul
AIP	American Institute of Physics approval in principle
AIRI	Atomic Industry Research Institute
AIRP	air intake, recirculation, and purification
AIRS	Advanced Incident Reporting System (IAEA/NEA) advanced instrumentation for reflood studies Automated Inspection Report System
AIS	accumulator injection system advanced isotope separation automated information system
AISC	American Institute of Steel Construction
AISE	Association of Iron and Steel Engineers
AISI	American Iron and Steel Institute
AISS	automated information systems security
AISSP	automated information system security plan
AIT	American Industrial Technologies	American Institute in Taiwan	augmented inspection team
AITS	action item tracking system
AIX	after ion exchanger
AKK	Atomkraftdonsortiet Krangede Ad & Co. (Sweden)
AL	action level	analytical laboratory	analytical limit
ALAP	as low as possible	as low as practicable	as low as practical
ALARA	as low as reasonably achievable
ALARP	as low as reasonably practicable
ALATA	as low as technically achievable
ALCP	area local control panel
ALD	acoustic leak detection
ALI	annual level of intake
ALIP	annular linear induction pump
ALJ	administrative law judge
ALKEM	Alpha Chemie und Metallurgie, G.m.b.H. (Germany)
ALMPC	Agency Labor-Management Partnership Committee
ALMR	advanced liquid metal reactor
ALMS	auxiliary liquid metal system
ALP	assembly language preprocessor
ALPHGR	average linear planar heat generation rate
ALPR	Argonne Low Power Reactor	Army low-power reactor
ALRR	Ames Laboratory Research Reactor
ALRS	Apache Leap Research Site
ALSI	aluminum silicon alloy
ALUPA	Association Luxembourgeoise pour l’Utilisation Pacifique de l’Energie Atomique (Luxembourg)
ALWR	advanced light-water reactor
AMAD	activity median aerodynamic diameter
AMASS	automated material accounting statistics system
AMCA	Air Moving and Conditioning Association
AMCF	alkali metal-cleaning facility
AMCO	Aerojet Manufacturing Company
AMD	alpha activity median diameter
AMDEL	Australian Mineral Development Laboratories
AMF	automated materials frisker
AMI	automatic motion inhibit
AMIC	Arkwright Mutual Insurance Co.
AMN	Ansaldo Meccanico Nucleare, SpA (Italy)
AMPERE	Atomes et Molecules pour Etudes Radio-Electriques (Switzerland)
AMRR	Army Materiels Research Reactor
AMS	aerial monitoring system	Allegations Management System	Army Map Service
AMSAC	ATWS (anticipated transient without scram) mitigating system actuation circuitry
AMU	aqueous makeup	atomic mass unit
A/N	alphanumeric	as needed
ANC	advanced nodal code	Aerojet Nuclear Company
ANCC	Associazione Nazionale per il Controllo della Combustione (Italy)
ANDIN	Associazione Nazionale di Ingegneria Nucleare (Italy)
ANEC	American Nuclear Energy Council
ANF	actinide nitride fuel	actinide nitride fueled	Advanced Nuclear Fuels Corporation
ANFO	ammonium nitrate and fuel oil
ANGRY	Anti-Nuclear Group Representing York
ANI	American Nuclear Industries	American Nuclear Insurers	authorized nuclear inspector
ANIM	Association of Nuclear Instrument Manufacturers
ANL	Argonne National Laboratory
ANMC	American National Metric Council
ANN	artificial neural network
ANO	Arkansas Nuclear One
ANOVA	analysis of variance
ANP	aircraft nuclear propulsion
ANPR	advance notice of proposed rulemaking
ANPRM	advance notice of proposed rulemaking
ANR	Association of Neutron Radiographers
ANRA	Armenian Nuclear Regulatory Authority
ANRE	Agency of Natural Resources and Energy (Japan)
ANS	American Nuclear Society	aquatic nuisance species	autodial network system
ANSI	American National Standards Institute
ANSTO	Australian Nuclear Science and Technology Organization (formerly AINSE)
AO	abnormal occurrence	air operator	auxiliary operator	axial offset
AOA	axial offset anomaly
AOC	action office contact	augmented operator capability
AOG	acid fractionator off-gas	acid off-gas	augmented off-gas
AOI	abnormal operating instruction	advance ordering information
AOO	anticipated operational occurrence
AOP	abnormal operating procedure
AOR	abnormal occurrence report
AOT	action outage time	allowable outage time	allowed outage time
AOTA	absorber open test assembly
AOV	air-operated valve
AP	access permit	access permittee	administrative procedure	alkaline permanganate	annulus pressurization	antennas and propagation
APA	Administrative Procedure Act
APC	administration and project control	agency program coordinator	argon purge cart	Atomic Power Construction Ltd. (United Kingdom)
APCA	Air Pollution Control Association
APCEF	Advanced Power Conversion Experimental Facility
APCO	Alabama Power Company
APD	axial power distribution
APDA	Atomic Power Development Associates, Inc.
APDMS	auxiliary power distribution monitoring system	axial power distribution monitoring system
APET	accident progression event tree
APEX	Advanced Plant Experiment
APFA	accelerator pulsed fast critical assembly
APHA	American Public Health Association
API	absolute position indication	American Petroleum Institute	antecedent precipitation index
APL	Applied Physics Laboratory (University of Chicago)	Arkansas Power & Light Co.	authorized possession limit
AP&L	Arizona Power & Light Company
APLHGR	average planar linear heat generation rate
APM	air particulate monitor	aluminum powder metallurgy
APP	advance procurement plan
APPA	American Public Power Association
APPR	Army Package Power Reactor
APR	advance production release	Army Power Reactor	automatic pressure relief
APRF	Aberdeen Pulsed Reactor Facility
APRM	average power range monitor
APS	accident-prone situation	American Physics Society	Arizona Public Service Co.	atomic power station	auxiliary power system
AP600	Advanced Plant, 600 MWe
APSR	axial power shaping rod
APSRA	axial power shaping rod assembly
APT	accelerator-produced tritium	Applied Physical Technology Incorporated
APTR	advanced pressure tube reactor
APU	auxiliary power unit
APWG	action plan work group
APWR	advanced pressurized-water reactor
AQL	acceptable quality level
AR	activity ratio
ARAC	atmospheric release advisory capability
ARACOR	Advanced Research and Applications Corp.
ARAVS	auxiliary and radwaste area ventilation system
ARB	Allegation Review Board
ARBOR	Argonne Boiling Water Reactor
ARC	alarm response card	Alliance Research Center	alternate repair criteria	alternative repair criteria	auxiliary relay cabinet
ARDA	Atomic Research and Development Authority
ARDM	age-related degradation mechanism
ARDUTLR	aging-related degradation unique to license renewal
ARE	aircraft reactor equipment
AREA	American Railway Engineering Association	Army Reactor Area
ARG	Accident Review Group (NRC)
Argonaut	Argonne nuclear assembly for university training
ARHCO	Atlantic Richfield Hanford Co.
ARI	alternate rod insertion	ATWS (anticipated transient without scram) rod injection
ARIS	automated reactor inspection system
ARM	area radiation monitor
ARMF	Advanced Reactivity Measurement Facility
ARMS	aerial radiological measurement and survey	aerial radiological measurements system	area radiation monitoring system	area radiological monitoring system
ARO	all rods out
ARP	accelerated requalification program	alarm response procedure	annunciator response procedure
ARPA	Archeological Resources Protection Act
ARPI	absolute rod position indication
ARR	Armour Research Reactor	Association for Radiation Research (United Kingdom)
ARRS	airborne radioactivity removal system
ARS	acute radiation syndrome	advance record system	air return system	amplified response spectrum/spectra
ART	aerosol release and transport	anticipatory reactor trip
ARTS	anticipatory reactor trip system
AS	action statement	Agreement State	air supply	auto sequential	auxiliary steam
A/S	air supply
ASA	American Standards Association (now ANSI)
ASADA	Atomic Space and Development Authority
ASC	Administrative Services Center
ASCE	American Society of Civil Engineers
ASCEG	Association of South Carolina Electric and Gas Investors
ASCII	American Standard Code for Information Interchange
ASCO	American Switch Co.
ASCS	Agricultural Stabilization and Conservation Service
ASD	adjustable speed drive	atmospheric steam dump
ASDP	alternative shutdown procedure
ASEE	American Society of Electrical Engineers
ASEP	accident sequence evaluation program
ASG	auxiliary steam generator
ASGT	asymmetric steam generator transient
ASGTPTF	asymmetric steam generator transient protective trip function
ASHAE	American Society of Heating and Air Conditioning Engineers
ASHRAE	American Society of Heating, Refrigeration and Air Conditioning Engineers
ASI	adverse system interaction	axial shape index
ASIS	American Society for Industrial Security
ASL	approved suppliers list
ASLAB	Atomic Safety and Licensing Appeal Board (NRC)
ASLAP	Atomic Safety and Licensing Appeal Panel (NRC)
ASLB	Atomic Safety and Licensing Board (NRC)
ASLBP	Atomic Safety and Licensing Board Panel (NRC)
ASM	American Society for Metals (now ASM International)
ASME	American Society of Mechanical Engineers
ASME	CodeAmerican Society of Mechanical Engineers Boiler and Pressure Vessel Code
ASNT	American Society for Nondestructive Testing	Australian School of Nuclear Technology
ASP	accident sequence precursor	administrative site procedure	auxiliary shutdown panel
ASPEA	Association Suisse pour l’Energie Atomique (Switzerland)
ASQC	American Society for Quality Control
ASR	automatic send and receive
ASS	auxiliary steam system
ASSE	American Society of Safety Engineers
ASSP	acoustics, speech, and signal processing
ASTM	American Society for Testing and Materials
ASTPO	Accident Source Term Program Office
ASTR	Aerospace Systems Test Reactor
ASW	auxiliary saltwater	auxiliary service water
AT	acceptable test	acceptance tag	acceptance test
ATC	adiabatic toroidal compressor
ATEL	Aare Tessin Aktiengesellschaft für Elektrizität (Switzerland)
ATEN	Association Technique de l’Energie Nucléaire (France)	Association Technique pour la Production et l’Utilisation de l’Energie Nucléaire (France)
ATF	acceptance test facility	Alcohol, Tobacco and Firearms, Bureau of (U.S. Department of Treasury)
ATH	artificial time history
ATOG	abnormal transient operational guideline	anticipated transient operating guideline
ATP	acceptance test plan	acceptance test procedure
A&TP	assembly and test pit
ATR	advanced test reactor
ATRCE	advanced test reactor critical experiment
ATS	agency training system	Arkwright Technical Services, Inc.	Atomtekniska Sällskapet i Finland (Finland)
ATSR	Argonne Thermal Source Reactor
ATT	aerosol transport test	automatic turbine tester
ATTU	ATWS (anticipated transient without scram) transmitter trip unit
ATU	analog trip unit
ATWS	anticipated transient without scram
ATWS-RPT	anticipated transient without scram–recirculation pump trip
ATWT	anticipated transient without trip
AU	authorized user
AUDIT	automatic unattended detection inspection transmitter
AUEA	auxiliary utility equipment area
AUO	auxiliary unit operator
AUT	automated ultrasonic test
AUTODIN	automated digital network
AUTOS	agency upgrade of technology for office systems
AUXI-ATOME	Société Auxiliaire pour l’Energie Atomique (France)
AVB	antivibration bar
AVIS	atomic vapor isotope separation
AVLIS	atomic vapor laser isotope separation
AVMS	annulus vacuum maintenance system
AVR	Arbeitsgemeinschaft Versuchsreaktor, G.m.b.H. (Germany)	automatic volume recognition
AVSS	automated vendor selection system
AVT	all-volatile treatment
AVV	atmospheric vent valve
AW	acid waste
AWCC	active well coincidence counter
AWG	American wire gauge
AWNS	ABB Westinghouse Nuclear Services
AWP	automatic withdrawal prohibit
AWRE	Atomic Weapons Research Establishment (United Kingdom)
AWS	American Welding Society
AWSF	alpha waste storage facility
AWWA	American Water Works Association
AZPS	Arizona Public Service Co.
BA	biological assessment
B/A	budget authority
BAA	broad agency announcement
BAC	blood alcohol content	boric acid concentrator
BACT	best available control technology
BAF	bioaccumulation factor	bottom of active fuel
BAM	Bundesanstalt für Materialforschung und -prüfung (Germany)
BAMT	boric acid mix tank
BAP	branch arm piping
BAPE	branch arm piping enclosure
BAPL	Bettis Atomic Power Laboratory
BAPS	branch arm piping shielding
BARC	Bhabha Atomic Research Centre (India)
BART	butterfly analysis and review test
BAST	boric acid storage tank
BAT	backup auxiliary transformer	best available technology	boric acid tank	boric acid transfer
BATAN	Badan Tenaga Atom Nasional (Indonesia)
BATEA	best available technology economically available
BATF	Bureau of Alcohol, Tobacco and Firearms (U.S. Department of Treasury)
BAWTR	Babcock & Wilcox Nuclear Development Center Test Reactor
BBC	Brown Boveri et Cie (Switzerland)
BBR	Babcock-Brown Boveri Reaktor, G.m.b.H. (Germany)
BBRR	Brookhaven Beam Research Reactor
BBS	battery backup system	bulletin board system
BBV	Bayrische Biologische Versuchsanstalt (Germany)
BC	benign contamination	branch chief
BCD	Battelle Columbus Division	binary coded decimal
BCHFT	beyond critical heat flux test
BCL	Battelle Columbus Laboratories	Bechtel client letter
BCMS	boron concentration measurement system
BCS	Boeing Computer Services
BCT	best conventional technology
BD	blowdown
BDAT	best demonstrated available technology
BDBA	beyond-design-basis accident
BDBE	beyond-design-basis event
BDE	beyond demonstrable effect
BD/ECC	blowdown/emergency core cooling
BDHT	blowdown heat transfer
BDPS	boric dilution protection system
BDT	best demonstrated technology
BE	best estimate	binding energy	bounding event
BEA	Bureau of Economic Analysis
BEAR	Biological Effects of Atomic Radiation, Committee on the
BEC	beginning-of-equilibrium cycle
BECO	Boston Edison Co.
BEEN	Bureau d’Etude de l’Energie Nucléaire (Belgium)
BEF	best-estimate flow
BEIR	Biological Effects of Ionizing Radiation, Committee on the
BEN	Bureau d’Etudes Nucléaires, S.A. (Belgium)
BEPO	British Experimental Pile Operation
BFN	Browns Ferry Nuclear Power Plant
BFNP	Browns Ferry Nuclear Power Plant
BFNPP	Browns Ferry Nuclear Performance Plan	Browns Ferry Nuclear Power Plant
BFO	best and final offer
BFY	budget fiscal year
BG&E	Baltimore Gas & Electric Co.
BGL	below ground level
BGRR	Brookhaven Graphite Research Reactor
BGV	below ground vault
BH	Blue Hills Station
BHEC	Bangor Hydro-Electric Co.
BHEP	basic human error probability
BHL	bottom of heated length
BHP	biological hazard potential
BHS	Blue Hills Station
BHSP	basic human success probability
BI	background information
BIA	buyers information advisory
BIF	basic inflow
BIFEN	Banque Internationale pour le Financement de l’Energie Nucléaire (France)
BIOMASS	Biosphere Modeling and Assessments (project)
BIOMOVS	IIBiosphere Model Validation Study, Phase II
BIOS	basic input-output system	biological investigation of space
BIR	boron injection recirculation
BIST	boron injection surge tank
BIT	boron injection tank
BKW	Bernische Kraftwerke, A.G. (Switzerland)
BLBE	beyond-licensing-basis event
BLIS	baffle/liner interface seal
BLM	Bureau of Land Management
BLP	basket loading pool
BLTC	bottom loading transfer cask
BM	bill of material	boron measurement
BMEP	brake mean effective power	brake mean effective pressure
BMEWS	ballistic missile early warning system
BMFT	Bundesministerium für Forschung und Technologie (Germany)
BMI	Battelle Memorial Institute
BML	bidders mailing list	bulk material length
BMR	Bureau of Mineral Resources (Australia)
BMRR	Brookhaven Medical Research Reactor
BMS	boron management system	boron measurement system
BMT	basement melt-through
BN	Belgonucléaire S. A. (Belgium)	board notification	Buestra Neutron (Soviet-designed fast-neutron reactor)
BNC	Berkeley Nucleonics Corporation
BNDC	British Nuclear Design & Construction Ltd.
BNEC	British Nuclear Energy Conference
BNES	British Nuclear Energy Society
BNF	British Nuclear Forum
BNFL	British Nuclear Fuels, Limited
BNFP	Barnwell Nuclear Fuel Plant
BNI	Bechtel National, Inc.
BNL	Brookhaven National Laboratory
BNP	Bellefonte Nuclear Plant
BNWL	Battelle Northwest Laboratory
BO	biological opinion
B/O	budget overlay
B&O	bulletin and order
BOA	basic order agreement	blanket order agreement
BOC	beginning of cycle	Bevitron orbit code	bottom of conduit	budget object classification
BOD	biochemical oxygen demand	biological oxygen demand
BOEC	beginning-of-equilibrium cycle
BOG	burner off-gas
BOL	beginning of life
BONUS	boiling nuclear superheat reactor
BONUS-CX	boiling nuclear superheat critical experiment
BOP	balance of plant
BOPSSAR	balance-of-plant standard safety analysis report
BORAX	boiling-water reactor experiment
BORE	beryllium oxide reactor experiment (formerly EBOR)
B&OTF	bulletins and orders task force
B/P	blueprint
BPA	blanket purchase agreement	Bonneville Power Administration
BPC	Bechtel Power Corporation
BPF	blueprint file
BPFM	bypass flow module
BPHA	benzoylphenylhydroxylamine
BPID	book physical inventory difference
BPN	breakdown pulse noise
BPNL	Battelle Pacific Northwest Laboratory
BPR	beryllium physics reactor	burnable poison rod	business process redesign	business process reengineering
BPRA	burnable poison rod assembly
BPV	boiler and pressure vessel	bypass valve
B&PV	boiler and pressure vessel
BPVC	Boiler and Pressure Vessel Committee
BPWS	blanked position withdrawal sequence
Bq	becquerel
BR	breeder reactor	breeding ratio
B&R	Brown and Root, Inc.	budget and reporting	Burns and Roe, Inc.
BRC	below regulatory concern	Breeder Reactor Corporation	Bureau of Radiation Control (State of Texas)
BREDAT	Breda Termomeccanica, SpA (Italy)
BREN	Bare Reactor Experiment Nevada
BREVATOME	Société Française pour la Gestion des Brevets d’Application Nucléaire (France)
BRG	budget review group
BRH	Bureau of Radiological Health
BRP	Bureau of Radiation Protection
BRPNP	Big Rock Point Nuclear Plant
BRR	Battelle Research Reactor	Brookhaven Research Reactor
BRS	Bibliographic Retrieval System	boron recycle system
BRWM	Board on Radioactive Waste Management
BS	Braidwood Station	Byron Station
B/S	bistable
BSEP	Brunswick Steam Electric Plant
BSF	bulk shielding facility
BSI	British Standards Institution
BSL	Bignier Schmid-Laurent (France)
BSR	Board of Standards Review (American National Standards Institute)	bulk shielding reactor
BSS	basic safety standard
BST	bleed storage tank	blowdown suppression tank	boron storage tank
BT	boiling transition	broadcast technology
BTFA	benzoyltrifluoroacetone
BTP	backfit test program	branch technical position
BTR	boron thermal regeneration
BTRS	boron thermal regeneration system
BTS	Brazilian thorium sludge
BUSS	backup scram system
B&V	Black & Veatch
BVFA	Bundesversuchs- und Forschungsanstalt Arsenal (Austria)
BVPS	Beaver Valley Power Station
B&W	Babcock & Wilcox Co. (now Framatome)
B&WC	Babcock & Wilcox Canada
BWC	Bingham-Willamette Co.
BWF	building wake factor
B&WFC	Babcock & Wilcox Fuel Co.
BWIP	basalt waste isolation program
B&WNT	Babcock & Wilcox Nuclear Technologies
B&WOG	Babcock & Wilcox Owners Group
BWR	boiling-water reactor
BWROG	Boiling Water Reactor Owners Group
BWRVIP	Boiling Water Reactor Vessel and Internals Project
B&WSSAR	Babcock & Wilcox Standard Safety Analysis Report
BWST	borated water storage tank
CA	charge amplifier	construction authorization	contract authorization	critical assembly
C/A	corrective action
CAA	Clean Air Act
CAC	carrier access code	containment atmosphere control
CACS	containment air cooling system	core auxiliary cooling system
CACW	core auxiliary cooling water
CACWS	core auxiliary cooling water system
CAD	computer-aided design	construction aid document	containment atmosphere dilution
CAES	compressed air energy storage
CAF	chemical analysis facility
CAFEE	critical assembly fuel element exchange
CAFTA	cutset and fault tree analysis
CAGT	collaborative advanced gas turbine
CAHE	core auxiliary heat exchanger
CAI	construction action item	computer-assisted instruction
CAIT	corrective action investigation team
CAL	confirmatory action letter	corrective action letter
CALUTRON	California University Cyclotron
CAM	constant air monitor	containment atmospheric monitoring	continuous air monitor
CAMEL	component and material evaluation loop
CAMEN	Centro Autònomo Militari Energia Nucleare (Italy)
CAN	Citizen’s Awareness Network
CANDU	Canadian Deuterium-Natural Uranium Reactor	Canadian Deuterium Uranium Reactor	Canadian Natural-Uranium, Heavy-Water-Moderated and -Cooled Power Reactor
CANE	Connecticut Aircraft Nuclear Experiment
CAOC	constant axial offset control
CAP	codes and paging	continuous audit program	corrective action plan	corrective action program
CAPCG	Central Area Power Coordination Group
CAPES	containment atmosphere purge exhaust system
CAPS	cell atmosphere processing system	construction advanced planning and sequencing
CAQ	condition adverse to quality
CAQR	condition adverse to quality report
CAR	condenser air removal	configuration acceptance review	containment air recirculation	control advisory release	corrective action report
CARA	Compagnie d’Applications et de Recherches Atomiques (France)
CARATOM	Compagnie d’Applications et de Recherches Atomiques (France)
CARC	containment air recirculation and cooling
CARS	condenser air removal system	containment atmosphere release system	containment atmosphere recirculation system
CAS	central alarm station	central alarm system	chemical addition system	circuits and systems	compressed air system
CASE	Citizens Action for Safe Environment	Citizens Association for Sound Energy	consolidated aerospace supplier evaluation	coordinating agency for supplier evaluation
CAT	chemical addition tank	computerized axial tomography	conditionally accepted tag	construction appraisal team	crack arrest technology	crack arrest temperature	crack arrest test
CATD	corrective action tracking document
CAV	crack arrest verification
CAVALIER	Cooperatively Assembled Virginia Low-Intensity Educational Reactor
CB	containment building	control building
CBAST	concentrated boric acid storage tank
CBD	Commerce Business Daily
CBDT	cause-based decision tree (method)
CBE	Citizens for a Better Environment
CBECS	control building environmental control system
CBI	Chesapeake Bay Institute	CBI Industries (formerly Chicago Bridge and Iron Co.)
CB&I	Chicago Bridge and Iron Co. (later CBI Industries)
CBL	Chesapeake Bay Laboratory	Chesapeake Biological Laboratory
CBLA	cost-beneficial licensing action
CBM	circuit breaker manufacturer
CBP	condensate booster pump
CBPC	Corn Belt Power Cooperative
CBPT	closed-loop in-reactor assembly backup plug tool
CBR	commercial breeder reactor
CBSR	coupled breeding superheating reactor
CBV	containment building ventilation
CC	centrifugal charging	coarse control	component check	component cooling
CCAS	containment cooling actuation signal
CCB	change control board	chemical cleaning building
CCCS	core components cleaning system	core components conditioning station	core components conditioning system
CCD	coarse control damper	counter-current digestion
CCDF	complementary cumulative distribution function
CCDP	conditional core damage probability
CCF	common-cause failure
CCFA	common-cause failure analysis/analyses
CCFL	counter-current flow limitation
CCFP	conditional containment failure probability
CCGC	containment combustible gas control
CCHEN	Comisión Chilena de Energía Nuclear (Chile)
CCI	core concrete interaction
CCM	SulzerCompagnie de Construction Mécanique Sulzer (France)
CCN	contract change notice
CCNB	Concerned Citizens for the Nuclear Breeder
CCNPP	Calvert Cliffs Nuclear Power Plant
CCP	centrifugal charging pump	chemical control procedure	core component pot
CCRC	core component receiving container
CCRS	computerized cable routing system
CCS	Carroll County Station	commitment control system	component cooling system	condensate cleanup system	condensate cooling system	containment cooling system
CCSS	centrifugally cast stainless steel
CCSW	component cooling service water
CCTF	cylindrical core test facility
CCTL	core component test loop
CCTV	closed-circuit television
CCU	containment cooling unit
CCW	closed cooling water	component cooling water	compound cooling water	condenser circulating water	condenser cooling water	counterclockwise
CCWS	closed cooling water system	component cooling water system
CD	civil defense
C/D	cooldown
CDA	containment depressurization actuation	core disruptive accident
CDBA	containment design-basis accident
CDC	Center for Disease Control	computer design code	Control Data Corp.
CDE	condensate demineralization effluent
CDF	core damage frequency	cumulative damage function
CDM	central data management
CDN	corporate data network
CDP	cask decontamination pit
CDPA	Civil Defense Preparedness Agency
CDPr	core damage probability
CDR	conceptual design requirement
CDRG	Catastrophic Disaster Response Group
CD-ROM	compact disk/read-only memory
CDS	cask decontamination station	component disassembly station	computer data screening	conceptual design study	condensate demineralization subsystem	current disposal site
CDV	capacitance discharge vaporization
CE	Combustion Engineering, Inc.	Commonwealth Edison Co.	conductivity element	Consumer Electronics	Corps of Engineers, U.S. Army
C/E	calculation/experiment
C-E	Combustion Engineering, Inc.
CEA	Cambridge Electron Accelerator	Chesapeake Energy Alliance	Commissariat à l’Energie Atomique (France)	control element assembly	Council of Economic Advisors
CEAC	control element assembly calculator
CEADS	control element assembly drive system
CEAN	Centre d’Etudes pour les Applications de l’Energie Nucléaire (Belgium)
CEBELCOR	Centre Belge d’Etude de la Corrosion (Belgium)
CEC	Citizens Energy Council	Claiborne Enrichment Center	Commission of the European Communities
CECO	Commonwealth Edison Co.	cost estimate change order
CECS	containment environmental control system
CEDE	committed effective dose equivalent
CEDM	control element drive mechanism
CEDMCS	control element drive mechanism control system
CEDS	control element drive system
CEEA	Comisión Ecuatoriana de Energia Atómica (Ecuador)	Communauté Européenne de l’Energie Atomique
CEEN	Centre d’Etude de l’Energie Nucléaire (Belgium)
CEER	Center for Energy and Environment Research (Puerto Rico)
CEFILAC	Compagnie du Filage des Métaux et des Joint Curty (France)
CEG	Contractor Engineering Group
CEGB	Central Electricity Generating Board (United Kingdom)
CEHA	contact equipment handling area
CEIC	Cleveland Electric Illuminating Co.
CEICO	Cleveland Electric Illuminating Co.
CEL	carbon equilibrium loop	coating exempt log
CEM	Compagnie Electro-Mécanique (France)
CEN	Centre d’Etudes Nucléaires (France)	Centre d’Etude de l’Energie Nucléaire (Belgium)
CENC	Centre d’Etudes Nucléaires de Cadarache (France)
CENFAR	Centre d’Etudes Nucléaires de Fontenay-aux-Roses (France)
CENG	Centre d’Etudes Nucléaires de Grenoble (France)
CENS	Centre d’Etudes Nucléaires de Saclay (France)
CENUSA	Centrales Nucleares, S.A. (Spain)
CENY	Consolidated Edison Co. of New York
CEOG	Combustion Engineering Owners Group
CEPC	Central Electric Power Cooperative, Inc.
CEQ	Council on Environmental Quality
CER	complete engineering release	condition evaluation report	critical experiment reactor
CERC	Coastal Engineering Research Center, U.S. Army
CERCA	Centre de Recherches pour Combustibles Atomiques (France)	Compagnie pour l’Etude et la Réalisation de Combustibles Atomiques (France)
CERCLA	Comprehensive Environmental Response, Compensation, and Liability Act
CERES	Coalition for Environmentally Responsible Economies
CERL	Construction Engineering Research Laboratory
CERMET	ceramic and metal (fuel)
CERT	candidate evaluation, certification, and selection record	constant extension rate test(ing)	Council of Energy Resources Tribes
CES	critical experiment station
CESNEF	Centro di Studi Nucleari Enrico Fermi (Italy)
CESR	colliding electron-beam storage ring
CESSAR	Combustion Engineering Standard Safety Analysis Report
CET	containment event tree	core exit thermocouple	critical experiment tank
CETR	Consolidated Edison Thorium Reactor
CETS	control element test stand
CEVAR	consumable-electrode vacuum-arc remelt
CF	column feed	confinement factor	continuous flow	core flooding	correction factor
CFAR	component failure analysis report
CFB	C.F. Braun and Co.
CFC	Constructions Férroviaires du Centre, S.A. (Belgium)
CFCCS	condensate and feedwater chemistry control system
CFCU	containment fan cooler unit
CFD	cell floor drain
CFDT	Confédération Française Démocratique du Travail (France)
CFE	clandestine fission explosive	Comisión Federal de Electricidad (Mexico)
CFFTR	Canadian Fusion Fuel Technology Project
CFI	core flooding interlock
CFM	containment failure mode
CFO	Chief Financial Officer
CFR	Code of Federal Regulations
CFR	commercial fast reactor	condensate filter demineralizer
CFRE	circulating-fuel reactor experiment
CFRMF	coupled fast reactor measurement facility
CFS	cavity fission source	condensate and feedwater system	core flood system	core former structure
CFT	core flood tank	core flooding tank
CFTC	cooler flusher tank cell
CFTE	cooler flusher tank equipment
CFTL	component flow test loop
CFU	cumulative fatigue usage
CFUR	Citizens for Fair Utility Regulation
CFW	condensate and feedwater
CFWS	condensate and feedwater system
CGCS	combustion gas control system
CGE	Canadian General Electric
CGEC	Cincinnati Gas and Electric Co.
CGEL	cover gas evaluation loop
CGI	commercial-grade item
CGMS	cover gas monitoring subsystem
cGy	centigray
CHAP	composite HTGR (high-temperature gas reactor) analysis program
CHAT	CLIRA (closed-loop in-reactor assembly) holddown assembly tool
CHCF	component handling and cleaning facility
CHEP	conditional human error probability
CHF	critical heat flux
CHFR	critical heat flux ratio
CHGE	Central Hudson Gas and Electric Corp.
CHLA	candidate high-level action
CHLW	commercial high-level waste
CHMT	components, hybrids, and manufacturing technology
CHN	construction hold notice
CHP	certified health physicist
C&HP	chemistry and health physics
CHR	cooling water/hot water return
CHRS	containment heat removal system
CHU	centigrade heat unit
CHWR	cooling water/hot water return
C/HWR	cooling water/hot water return
C-HWR	cooling water/hot water return
CI	center island	chemical injection	containment integrity	containment isolation
C&I	control and instrumentation
Ci	curie
CIA	Central Intelligence Agency	containment isolation A
CIAS	containment isolation actuation signal
CIB	containment isolation B
CIC	carrier identification code
CICA	Competition in Contracting Act
CICAF	Compagnie Industrielle des Combustibles Atomiques Frittes (France)
CID	component identification
CIEMAT	Centro de Investigaciones Energeticas, Medio Ambientales (Spain)
CIIP	condenser inservice inspection program
CILRT	containment integrated leak rate test
CIMI	Compagnia Italiana Montaggi Industriali, SpA (Italy)
CINDA	computer index of neutron data
CIO	Chief Information Officer
CIP	containment improvement program
C/IP	construction/inspection procedure
CIPC	Central Iowa Power Cooperative
CIPP	customized inspection program pilot	customized inspection program process	customized inspection planning process (now IPAP)
CIR	Canada-India Reactor (India)
CIREA	Commission Interministérielle des Radioéléments Artificiels (France)
CIRGA	Critical Isotope Reactor, General Atomic Co.
CIRRPC	Committee on Interagency Radiation Research and Policy Coordination
CIRS	containment iodine removal system
CIS	chemical injection system	containment isolation signal	containment isolation system	contract information sheet
CISDEN	Centro Italiano di Studi di Diritto dell’Energia Nucleare (Italy)
CISE	Centro Informazioni Studi Esperienze, SpA (Italy)
CISF	centralized interim storage facility
CISIP	condenser inservice inspection program
CISSCO	Comprehensive Information Systems Support Consolidation
CIT	conductivity indicator transmitter	corporate investigation team	critical incident technique
CIV	center island vessel	combined intercept valve	combined intermediate valve	containment isolation valve
CIWA	condition identification work authorization
CL	closed loop	containment leakage
CLA	cold-leg accumulator
CLAA	Centre Lyonnais d’Applications Atomiques (France)
CLB	current licensing basis
CLC	closed-loop condensate
CLCGM	closed-loop cover gas monitor
CLCIS	closed-loop control and instrumentation system
CLCS	consequence limiting control system
CLCV	cold-leg check valve
CLCW	closed-loop cooling water
CLEI	Cleveland Electric Illuminating Co.
CLEM	closed-loop ex-vessel machine
CLEMT	closed-loop ex-vessel machine transporter
CLIRA	closed-loop in-reactor assembly
CLIV	cold-leg isolation valve
CLJA	closed-loop jumper assembly
CLLRW	commercial low-level radioactive waste
CLOF	complete loss of feedwater
CLOFA	complete loss-of-fluid accident
CLOHS	complex loss-of-heat sink
CLP	Connecticut Light and Power Co.
CLR	core lateral restraint
CLRWS	clean liquid radioactive waste system
CLS	cask loading station	closed-loop system	consequence limiting system
CLSD	Central Laboratories Services Dept. (TVA)
CLSMDA	closed-loop-system meltdown accident
CLWR	commercial light-water reactor
CM	coarse mixing	condition monitoring	configuration management	coolant mixing	core melt	corrective maintenance
CMA	classified mail address
CMAA	Crane Manufacturers Association of America
CMC	component modification card	core monitoring computer
CMCI	core-melt/coolant interaction
CMEA	Council for Mutual Economic Assistance (U.S.S.R.)
CMEP	Critical Mass Energy Project
CMF	central maintenance facility	common-mode failure	core-melt frequency
CMFA	common-mode failure analysis/analyses
CMFLPD	core maximum fraction of limiting power density
CMI	care and maintenance instruction
CML	Critical Mass Laboratory
CMM	core mechanical mockup
CMMF	component maintenance and mockup facility
CMOD	crack mouth opening displacement
CMP	CLEM (closed-loop ex-vessel machine) maintenance pit	coastal management program	condition monitoring program	configuration management plan	controlled materials production
CMPC	Central Maine Power Co.
CMRG	Core Melt Review Group
CMT	core makeup tank
CMTR	certified material test report	certified mill test report
CNA	Canadian Nuclear Association	Centrale Nucléaire des Ardennes (Belgium)
CNB	Centrale Nucléaire Belge (Belgium)
CNC	condensation nuclei counter
CNEA	Comisión Nacional de Energía Atómica (Argentina)
CNEN	Comisión Nacional de Energía Nuclear (Mexico)	Comissão Nacional de Energía Nuclear (Brazil)	Comitato Nazionale per l’Energia Nucleare (Italy)	Conseil National de l’Energie Nucléaire (Luxembourg)
CNET	Center for Nuclear Engineering and Technology
CNEUPEN	Commission Nationale pour l’Etude de l’Utilisation Pacifique de l’Energie Nucléaire (Belgium)
CNFP	commercial nuclear fuel plant
CNI	Consolidated National Intervenors
CNN	Cable Network News
CNNA	China National Nuclear Corporation
CNO	Chief Nuclear Officer
CNPP	corporate nuclear performance plan
CNR	Committee for Nuclear Responsibility
CNRA	Committee on Nuclear Regulatory Activities (of the OECD-NEA)
CNRAG	corporate nuclear review and audit group	company nuclear review and audit group
CNRM	Centre National de Recherches Métallurgiques (Belgium)
CNRN	Comitato Nazionale per le Ricerche Nucleare (Italy)
CNRS	Centre National de la Recherche Scientifique (France)
CNS	Catawba Nuclear Station	Cherokee Nuclear Station	Cooper Nuclear Station	corporate nuclear safety
CNSI	Chem-Nuclear Systems, Inc.
CNSNS	Comisión Nacional de Seguridad Nuclear y Salvaguardias (Mexico)
CNSR	combination neutron source rod
CNWRA	Center for Nuclear Waste Regulatory Analyses
CO	change order	check open	chief operator	confirmatory order	contracting officer
COB	close of business
COBOL	common business-oriented language
COBRA	Consolidated Omnibus Budget Reconciliation Act	coolant boiling and in-rod array
COC	certificate of compliance	certificate of conformance	Cleveland open cup (method)
COCA	consent order and compliance agreement
COCORP	Consortium of Continental Reflection Profiling
COD	chemical oxygen demand	crack opening displacement
COE	Corps of Engineers, U.S. Army
COFINATOME	Compagnie de Financement de l’Industrie Atomique (France)
COG	cell off-gas	condenser off-gas	continuity of government
COGAP	combustion gas analyzer program
COI	conflict of interest
COL	combined operating license	construction/operating license
COLR	core operating limit report
COLSS	core operating limit supervisory system	core operating limit support system
COM	communications	computer output on microfiche	computer output on microfilm
COMET	computer-operated management evaluation technique
COMRADEX	containment and meteorology for radiation exposure
COMSEC	communications security
CONAGT	Committee on Nuclear Air and Gas Treatment (ASME)
CONS	Consolidation, Office of (NRC)
COOP	continuity of operations plan
COPPS	committee on power plant siting
COPS	containment overpressure protection systems
CORAPRO	Contrôle-Radioprotection (Belgium)
CORAR	Council on Radionuclides and Radiopharmaceuticals
COREN	Combustibili per Reattori Nucleari, SpA (Italy)
CORS	catalytic oxygen removal system
COS	change of station
COTS	commercial off-the-shelf
COV	center of vortex
CP	Callaway Plant	change proposal	charging pump	Chicago Pile	civil penalty	cold pipe	column product	Comanche Peak	Commission paper	construction permit	construction procedure	containment purge	coolant pump	critical power
C/P	current/pneumatic
CP-5	Chicago Pile #5
CPA	Cooperative Power Association
CPC	Consumers Power Co.	contact process cell	controlled-potential coulometer	core protection calculator	core protection computer
CPCo	Consumers Power Company
CPCSF	construction permit containment support fixture
CPD	condensate pump discharge
CPDD	conceptual project design description
CPDO	containment performance design objective
CPDS	condensate polishing demineralizer system
CPE	contractor performance evaluation
CPER	construction permit environmental report
CPFF	cost plus fixed fee
CPI	center pressure index	containment performance improvement
CPIC	Capital Planning and Investment Control
CPIS	containment purge isolation signal
CP&L	Carolina Power & Light Co.
cpm	count per minute
CPM	critical path method
CPP	Center for Plutonium Production	coil power programmer	containment pre-entry purge	containment protection professional
CPPMU	containment pre-entry purge makeup
CPPR	construction permit for a power reactor
CPR	critical power ratio
CPRR	construction permit for a research reactor
CPRRG	Comanche Peak Report Review Group
CPRT	Comanche Peak Response Team
CPRW	condensate polishing regeneration waste
CPRWCT	condensate polishing regeneration waste collection tank
CPS	canister positioning system	cathodic protection system	Clinton Power Station	condensate polishing system	containment purge system	conversion program system	core and plant system
cps	count per second
CPSC	Consumer Products Safety Commission
CPSCI	central personnel security clearance index
CPSES	Comanche Peak Steam Electrical Station
CPU	central processing unit
CPVC	chlorinated polyvinyl chloride
CPWF	cementitious pelletized waste form
CQ	Congressional Quarterly
CQAA	corporate quality assurance audit
CQE	cognizant quality engineer	critical quality element
CR	Chicago Reactor	civil rights	condition report	conditional release	containment rupture	contractor report	control rod	control room
CR	Congressional Record
CRA	control rod assembly
CRAC	calculation of reactor accident consequences	consequences of reactor accident code
CRACS	control room air conditioning system
CRATS	control room air temperature system
CRAVS	control room area ventilation system
CRB	control rod blade	cost review board
CRBR	Clinch River Breeder Reactor	controlled-recirculation boiling-water reactor
CRBRP	Clinch River Breeder Reactor Plant	Clinch River Breeder Reactor Project
CRC	critical reactor component
CRCPD	Conference of Radiation Control Program Directors
CRCTA	composite reactor components test activity
CRD	control rod drive	control rod driveline
CRDA	control rod drop accident
CRDCS	control rod drive control system
CRDD	control rod disconnect driveline
CRDHS	control rod drive hydraulic system
CRDM	control rod drive mechanism
CRDMS	control rod drive mechanism shroud
CRDR/A	control room design review/audit
CRDS	control rod drive system
CRDVF	control rod drive ventilating fan
CREATE	collective radiation exposure (NRC performance indicator)	control room envelope	controlled residual element
CREACS	control room emergency air cleanup system
CREATCS	control room emergency air temperature control system
CREDO	centralized reliability data organization
CREFAS	control room emergency fresh air system
CREFS	control room emergency filtration system
CREHVACS	control room emergency heating, ventilation, and air conditioning system
CREST	Committee on Reactor Safety and Technology
CREV	control room emergency ventilation
CREVS	control room emergency ventilation system
CRF	capacity reduction factor	correspondence routing form
CRFAS	control room fresh air system
CRG	Center Review Group
CRGR	Committee To Review Generic Requirements (NRC)
CRGT	control rod guide tube
CRI	Centre de Recherches et d’Irradiations (France)	control room indicator	control room isolation	criterion-referenced instruction
CRIS	control room isolation signal
CRM	Centre de Recherches Métallurgiques (Belgium)	Centrum voor Research in de Metallurgie (Belgium)	certified reference material	chemical remnant magnetization	core restraint mechanism	count rate meter
CRNGP	Crystal River Nuclear Generating Plant
CRNL	Chalk River Nuclear Laboratories
CRO	control room operator
CRPI	control rod position indication
CRS	conductivity recording switch	Congressional Research Service	containment recirculation spray
CRSS	containment recirculation spray system
CRT	cathode-ray tube	collet retaining tube
CRTF	core restraint test facility
CRU	combined rotating unit
CRUD	Chalk River unidentified deposit
CRVICS	containment and reactor vessel isolation control system
CRW	clean radwaste
CRWSS	condensate and refueling water storage system
CS	carbon steel	communications system	component support	containment safety	containment spray	contract specialist	control system	core spray	current status
CSA	chemical storage area	core special assembly	core structure accident
CSAS	containment spray actuating signal	containment spray actuating system	containment spray actuation signal
CSAU	code, scaling, applicability, and uncertainty (methodology)
CSB	core support barrel
CSC	Computer Sciences Corporation	containment spray cooling	core support cylinder
CSCC	caustic stress-corrosion cracking
CSCS	core standby cooling system
CSD	cold shutdown	constant speed drive
CSDD	conceptual system design description
CSDF	core segment development facility
CSE	components and structures engineering	containment steam explosion	containment systems experiment
CSF	central service facility	condensate storage facility	containment support fixture	Coulter Steel and Forge	critical safety factor	critical safety function
CSHX	containment spray heat exchange
CSIP	containment safety initiatives program
CSIS	containment spray injection system
CSN	Consejo de Seguridad Nuclear (Spain)
CSNE	Citizens for Safe Nuclear Energy
CSNI	Committee on the Safety of Nuclear Installations (NEA)
CSOEC	Columbus and Southern Ohio Electric Co.
CSP	Coalition for Safe Power	conditional success probability	containment spray pump	core spray pump
CSPT	core support performance test
CSR	cable spreading room
CSRS	containment spray recirculation system
CSS	cask support structure	cast stainless steel	condensate storage system	containment spray system	core spray system	core support structure
CST	condensate storage tank
CSTB	condensate storage tank building
CSTR	continuously stirred tank reactor
CSTS	condensate storage and transfer system	construction and startup/turnover surveillance group
cSv	centisievert
CSWS	Central and Southwest Services, Inc.
CT	cable test	CLEM (closed-loop ex-vessel machine) transporter	compact tension	computerized tomography	cooling tower	current transformer
CTBT	Comprehensive (Nuclear) Test Ban Treaty
CTD	charged tape detection
CTF	cask tilting fixture
CTG	combustion turbine generator
C/Th	carbon-to-thorium atomic ratio
CTI	Cooling Tower Institute
CTL	Canatom Ltd. (Canada)
CTM	cable transfer machine	collimation test module
CTOS	cassette operations system
CTP	construction test procedure	controlled temperature profile
CTR	certified test result	controlled thermonuclear reactor
CTRM	control room
CTS	concentrate transfer system	condensate transfer and storage	current technical specification
CTT	cask transfer tunnel
CTTP	cask transport and testing program
CTVC	cable tray vertical chase
C/U	carbon-to-uranium atomic ratio
CUB	Citizen’s Utility Board
CUC	cask unloading cell
CUF	cumulative usage factor
CUP	cask unloading pool
CURE	Citizens United for Responsible Energy
CUSP	City Utilities of Springfield
CUWS	cask unloading warm shop
CV	check valve	containment vessel	control valve
CVA	consecutive-valve actuation
CVAS	controlled ventilation area system
CVC	chemical and volume control
CVCS	charging and volume control system	chemical and volume control system
CVH	containment vent header
CVI	certified vendor information	containment ventilation isolation
CVIS	containment ventilation isolation signal
CVL	continuous vent line
CVN	Charpy V-notch	construction verification notification
CVP	continuous vacuum priming
CVPETS	condenser vacuum pump effluent treatment system
CVPSC	Central Vermont Public Service Corp.
CVPV	containment vacuum pump valve
CVTR	Carolinas-Virginia Tube Reactor
CW	case work	circulating water	cold worked	column waste	cooling water
CWA	Clean Water Act
CWB	chilled water building
CWIP	construction work in progress
CWO	capital work order
CWP	contractor work plan	control withdrawal prohibit
CWPC	calcined waste packaging cell
CWPH	circulating water pump house
CWR	cooling water return
CWS	circulating water system	compressed work schedule	cooling water system
CX	column extractant	criticality experiment
CY	calendar year
CYAP	Connecticut Yankee Atomic Power Co.
CYAPCO	Connecticut Yankee Atomic Power Co.
DA	deaerator	dose assessment
DAC	discretionary access control	distance amplitude correction
DAE	Department of Atomic Energy (India)
DAEC	Duane Arnold Energy Center
DAF	dynamic amplification factor
DANATOM	Danish Association for Industrial Development of Atomic Energy
DAR	design assessment report
DAS	data acquisition system	disturbance analysis system
DASHO	Designated Agency Safety and Health Official
DAT	disconnect actuating tool
DatF	Deutsches Atomforum e.V. (Germany)
DAVDS	data acquisition and visual display system
DAW	dry active waste
DAYP	Dairyland Power Cooperative
DB	dry bulb
DBA	design-basis accident
DBD	design-basis document	design-basis documentation
DBDA	design-basis depressurization accident
DBE	design-basis earthquake	design-basis event
DBF	design-basis fault	dominant bubble frequency
DBFA	design-basis fuel assembly
DBFB	deep-bed filter and blower
DBFL	design-basis flooding level
DBI	design-basis incident
DBLOCA	design-basis loss-of-coolant accident
DBMS	database management system
DBNPS	Davis-Besse Nuclear Power Station
DBOA	delayed breeder or alternative
DBP	dibutyl phosphate
DBPB	design-basis pipe break
DBR	design-basis reconstitution
DBT	design-basis tornado
DBTT	ductile-to-brittle transition temperature
DBVP	design baseline and verification program
DC	data control	design contractor	document control	drain channel
dc	direct current
DCA	design change and authorization	Dosimeter Corporation of America	drain channel A
DCAA	Defense Contract Audit Agency
DCB	drain channel B
DCC	damaged core coolability Daniels Construction Company degraded core coolability
DCCA	Data Computer Corporation of America
DCD	design control document document control desk
DCF	dose conversion factor
DCFO	Deputy Chief Financial Officer
DCH	direct containment heating drain collection header
DCIP	design change improvement program
DCIR	daily Cadweld inspection report
DCM	Delaware Custom Material
DCN	design change notice	document change notice
DCNPP	Diablo Canyon Nuclear Power Plant
DCP	design change package document control procedure Donald C. Cook Plant
DCPD	direct current potential drop
DCR	defueling completion report design change request direct conversion reactor
DCRDR	detailed control room design review
DCRN	dashpot cup retention nut
DCS	document control system
DCSP	dry cask storage project
DCSS	dry cask storage system
DCT	differential current transformer
DCV	directional control valve
DCX	direct current experiment
DD	deputy director Director’s Decision
D-D	deuterium-deuterium decontamination and decommissioning defueling and decommissioning
DDD	direct distance dialing
DDH&DS	digital data handling and display system
DDL	detergent and decontamination liquid [system]
DDNB	delayed departure from nucleate boiling
DDR	deficiency and disposition report
DDS	digital data service
DDT	deflagration to detonation	design data transmittal
DDTT	drag disc-turbine transducer
DE	diagnostic evaluation	Detroit Edison Co.	dose equivalent	double ended
DEA	driver evaluation assembly	Drug Enforcement Administration
DEB	double-ended break
DEC	Digital Equipment Corporation
DECL	double-ended cold leg
DECLG	double-ended cold-leg guillotine
DECO	Detroit Edison Co.
DECON	decontamination and dismantlement
DEDE	Deputy Executive Director for Regulatory Effectiveness (NRC)
DEDM	Deputy Executive Director for Management Services NRC
DEDR	Deputy Executive Director for Regulatory Programs (NRC)
DEFAS	diverse emergency feedwater actuation system
DEG	double-ended guillotine
DEGB	double-ended guillotine break
DEH	digital electrohydraulic
DEHL	double-ended hot leg
DEHLG	double-ended hot-leg guillotine
DEI	dielectric and electrical insulation	dose equivalent iodine
DEIS	draft environmental impact statement
DEMA	Diesel Engine Manufacturers Association
DEP	design external pressure	diagnostic evaluation plan	diagnostic evaluation program (NRC)
DEPS	double-ended pump suction
DEPSG	double-ended pump suction guillotine
DER	Department of Environmental Research	Department of Environmental Resources	design electrical rating	Deviation Event Report	double-ended rupture
DERE	Dounreay Experimental Reactor Establishment (Scotland)
DERM	disassembly examination reassembly machine
DES	data encryption standard	Department of Emergency Services	double-ended slot	draft environmental statement
DESL	double-ended suction leg
DESLS	double-ended suction leg slot
DET	decomposition event tree	diagnostic evaluation team
DEW	Deutsche Edelstahlwerke, A.G. (Germany)
DF	debris formation	decontamination factor
D&F	determination and findings
dF	dilution factor (also Fd)
DF	dilution factor	dose factor
Df	dose factor
DFA	driver fuel assembly	dummy fuel assembly
DFBN	debris-filter bottom nozzle
DFC	design field change
DFCS	digital feedwater control system
DFFR	dynamic forcing function report
DFI	demand for information
DFO	designated Federal official
DFOS	diesel fuel oil system
DFP	decommissioning funding plan	diesel fire pump
DFR	damaged fuel relocation	Dounreay Fast Reactor (Scotland)
DFRP	downcomer flow resistance plate
DFT	dry film thickness
DG	diesel-engine generator	diesel generator
D/G	diesel generator
DGA	dummy guide assembly
DGAS	diesel generator auxiliary system
DGB	diesel generator building
DGCAIES	diesel generator combustion air intake and exhaust system
DGCWS	diesel generator cooling water system
DGEA	draft generic environmental assessment
DGFOSTS	diesel generator fuel oil storage and transfer system
DGLS	diesel generator lubrication system
DGSS	diesel generator starting system
DGZ	desired ground zero
DH	decay heat
DHHS	Department of Health and Human Services
DHI	department head instruction
DHP	department head procedure
DHR	decay heat removal
DHRS	decay heat removal system	direct heat removal service	direct heat removal system
DHS	decontamination hot shop
DHX	dump heat exchanger
DHXCS	dump heat exchanger control system
DID	defense in depth
DIE	direct inspection effort
DIMPLE	Deuterium Moderated Pile Low Energy Reactor
DIP	design internal pressure
DIPS	dynamic isotope power system
DIV	drywell isolation valve
DL	dead load	Duquesne Light Co.
DLAT	discharge-line air temperature
DLF	dynamic load factor
DLL	discharge-line length
DLRWS	dirty liquid radioactive waste system
DLV	discharge-line volume
DLWL	discharge-line water-leg length
DM	damage monitor	demineralized
DMA	direct memory access
DMPL	Delmarva Power and Light Co.
DMS	data management subsystem	Defense Message Service
DMT	dispersive mechanism test
DMTR	Dounreay Materials Testing Reactor (Scotland)
DMUX	distributed multiplex
DMW	demineralized makeup water
DN	delayed neutron	discrepancy notice
DNA	Defense Nuclear Agency	deoxyribonucleic acid	does not apply
DNB	departure from nucleate boiling
DNBR	departure from nucleate boiling ratio
DNFSB	Defense Nuclear Facility Safety Board
DNM	delayed neutron monitor
DNMS	delayed neutron monitoring subsystem
DNPS	Dresden Nuclear Power Station
DNRC	Democritos Nuclear Research Center (Greece)
DNS	domain name server
DNT	dinitrotoluene
DO	designated official	digital output	dissolved oxygen	duty officer
DOCUMENT	Department of Commerce	dissolver off-gas condensate
DOD	Department of Defense
DOE	Department of Energy
DOG	dissolver off-gas
DOI	Department of the Interior
DOL	Department of Labor
DOJ	Department of Justice
DOP	detailed operating procedure	dioctyl phosphate	disaster operations plan	di-sec, octyl phthalate
DORF	Diamond Ordnance Radiation Facility
DOS	degree of sensitization	Department of State	disk operating system
DOSAR	Dosimetry Applications Research Facility
DOT	Department of Transportation
DP	data processing	differential pressure
D/P	differential pressure
DPA	delegation of procurement authority
DPC	Dairyland Power Cooperative	Duke Power Co.
DPD	decontamination as precursor to decommissioning
DPE	development project engineer	discipline project engineer
DPIS	differential pressure indicating switch
DPIV	drywell purge isolation valve
DPLC	Dayton Power and Light Co.
dpm	decade per minute	disintegrations per minute
DPMM	dewpoint moisture monitor
DPO	differing professional opinion
DPP	drip pan pot
DPR	developmental power reactor	demonstration power reactor
DPRK	Democratic People’s Republic of Korea
DPS	demand position system
DPV	differing professional view
DR	design review	designated representative	Danish Reactor	deficiency report	discrepancy report
DRA	dropped rod accident
DRC	dropped rod control
D/RE	disassembly/reassembly equipment
DRES	direct reading emission spectrograph
DRF	dose reduction factor
DRMW	demineralized reactor makeup water
DRP	disaster recovery plan	discrete radioactive particle
DRPI	digital rod position indication	digital rod position indicator
DRPIS	digital rod position indication system
DR/QR	design review/quality revalidation
DRR	document release record
DRS	development requirements specification	disassembly/reassembly station
DRW	dirty radwaste
DS	decontamination shop	design standard
D/S	dynamic/static
DSA	diagnostic self-assessment
DSAR	defueled safety analysis report
DSC	design safety criterion/criteria	dry shielded canister	dry storage canister
DSE	draft safety evaluation
DSER	draft safety evaluation report
DSI	direction-setting issue
DSIR	Department of Scientific and Industrial Research (United Kingdom)
DSL	drawing and specification listing
DSM	defect-specific management
DSO	designated senior official	director of site operations
D-T	deuterium-tritium
DTA	differential thermal analysis/analyses
DTER	draft technical evaluation report
DTI	diagnostic team inspection
DTNSRDC	David Taylor Naval Ship Research and Development Center
DTPA	diethylenetriamine pentaacetic acid
DTR	document transmittal record
DTRF	data transmittal and routing form
DTRS	development test requirement specification
DTS	differential temperature switch
DTT	design thermal transient	design transition temperature
DTV	direct torus vent
DUEGG	dual-energy gamma group
DUN	Douglas United Nuclear
DUNC	deep underwater nuclear counting
DuP-SR	E.I. DuPont de Nemours and Company–Savannah River
DUTS	decision unit tracking system
DVAL	degraded voltage analytical limits
DVM	digital voltmeter
DW	deadweight	demineralized water	drywell
DWCS	defueling water cleanup system
DWEDS	drywell equipment drain sump
DWFDS	drywell floor drain sump
DWG	drawing
DWICA	deep-water isotopic current analyzer
DWK	Deutsche Gesellschaft für Wiederaufarbeitung von Kernbrennstoffen, m.b.H. (Germany)
DWL	depressed water leg	drywell
DWMS	demineralized water makeup system
DWOC	Don’t Waste Oregon Council
DWP	detailed work plan
DWR	Department of Waste Resources
DWS	demineralized water system	development work statement
DWST	demineralized water storage tank
DWT	drop weight test
DYNAL	dynamic analysis/analyses
EA	enforcement action	engineering assurance	environmental assessment
E/A	element and attribute	erratum/errata and addendum/addenda
E&A	erratum/errata and addendum/addenda
EAB	exclusion area boundary
EAC	emergency assessment coordinator
EACC	Environmental Assessment Command Center
EACRP	European-American Committee on Reactor Physics
EACT	emergency action and coordination team
EAES	European Atomic Energy Society
EAG	emergency action guidelines
EAL	emergency action level	equipment air lock
EAP	emergency action plan	Event Assessment Panel	experimental activity proposal
EAPS	essential auxiliary power system
EAR	event analysis report
EAS	essential auxiliary support	experiment assurance system
EASE	elastic analysis for structural engineering
EASI	estimate of adversary sequence interruption
EAST	Eastern Utilities Associates
EATL	energy-absorbing torque limiter
EATS	Enforcement Action Tracking System
EB	electron beam
EBASCO	Electric Bond and Share Company	EBASCO Services Inc.
EBOR	experimental beryllium oxide reactor
EBR	experimental breeder reactor
EBS	emergency barrier system	Emergency Broadcast System
EBTF	ECC (emergency core cooling) bypass test facility
EBWR	experimental boiling-water reactor
EC	eddy current	emergency coordinator	enforcement coordinator	European Communities	event category
ECA	energy-conversion area	engineering change authorization
ECAR	East Central Area Reliability Coordination Agreement
ECC	emergency control center	emergency core coolant	emergency core cooling
ECCS	emergency core cooling system
ECCW	emergency core cooling water (system)
ECD	electron capture device
ECF	emergency cooling function
ECFM	eddy current flowmeter
ECI	emergency coolant injection	essential controls and instrumentation
ECN	Energieonderzoek Centrum Nederland (Netherlands)	engineering change notice
ECNG	East Central Nuclear Group, Inc.
ECNP	Environmental Coalition on Nuclear Power
ECP	emergency cooling pond	employee concerns program	engineering change proposal	estimated critical position
E&CQA	engineering and construction quality assurance
ECR	emergency coolant recirculation	estimate change request
ECS	emergency control station	environmental control shroud	environmental control system
ECSP	employee concerns special program
ECST	emergency condensate storage tank
ECT	eddy current test	emergency cooling tower
ECTG	employee concerns task group
ECTS	electronic custom telephone set	electronic custom telephone system
ECU	environmental control unit
ECW	emergency cooling water	essential chilled water
ECWP	emergency cooling water pond
ECWPH	emergency cooling water pump house
ED	electron device	exhaust damper
EDAX	energy dispersive x-ray analysis/analyses
EDC	emergency decontamination center
ED&C	electrical distribution and control
EDCN	engineering drawing change notice
EDCP	emergency design change package
E&DCR	engineering and design coordination report
EDECWS	emergency diesel engine cooling water system
EDELS	emergency diesel engine lubrication system
EDESS	emergency diesel engine starting system
EdF	Electricité de France (France)
EDG	emergency diesel generator
ED/G	emergency diesel generator
EDGCAIES	emergency diesel generator combustion air intake and exhaust system
EDM	electric discharge machining	electrical disintegration machining
EDN	engineering discrepancy notice
EDO	Executive Director for Operations (NRC)
EDP	electronic data processing
EDRO	Executive Director of Regional Operations, Office of (U.S. Food and Drug Administration)
EDS	electrical distribution system	experimental data system	explosives detection system
EDSFI	electrical distribution system functional inspection
EDT	energy dissipation test	equipment drain tank	explosives detector team
EDTA	ethylenedinitrilo tetraacetic acid
EDTS	equipment drain treatment system
EEC	end-of-equilibrium cycle	European Economic Community
EECW	emergency equipment cooling water
EEI	Edison Electric Institute
EEM	extrapolated endpoint method
EEPVS	electrical equipment protection ventilation system
EEQML	electrical equipment qualification master list
EEQSP	environmental equipment qualification summary package
EER	engineering evaluation request
EERF	Eastern Environmental Radiation Facility
EES	economizer-evaporator superheater	emergency exhaust system
EESWS	emergency equipment service water system
EFAPP	Enrico Fermi Atomic Power Plant
EFAS	emergency feedwater actuation signal	emergency feedwater actuation system
EFCO	Engineers and Fabricators Company
EFCV	excess flow check valve
EFD	engineering flow diagram
EFDS	equipment and floor drainage system
EFFBR	Enrico Fermi Fast Breeder Reactor
EFI	Enrico Fermi Institute
EFIC	emergency feedwater initiation and control
EFM	expected flow measurement
EFNS	Educational Foundation for Nuclear Science
EFO	equipment forced outage (NRC performance indicator)
EFOIA	Electronic Freedom of Information Act
EFP	electric fire pump	Enrico Fermi Atomic Power Plant
EFPD	effective full-power day	equivalent full-power day
EFPH	effective full-power hour
EFPM	effective full-power month
EFPY	effective full-power year
EFS	emergency feedwater system
EFT	emergency filter treatment	emergency filter train
EFW	emergency feedwater
EFWS	emergency feedwater system
EFWST	emergency feedwater storage tank
EG	emergency generator
EGCR	experimental gas-cooled reactor
EGDN	ethylene glycol dinitrate
EG&G	Edgerton, Germeshausen & Grier
EGM	enforcement guide memorandum/memoranda
EGTS	emergency gas treatment system
EH	electrohydraulic
EHC	electrohydraulic control
EHNP	Edwin I. Hatch Nuclear Plant
EHR	emergency heat removal
EHV	extra high voltage
EI	emergency injection	engineering instruction
E&I	electrical and instrumentation
EIA	Energy Information Administration	environmental impact appraisal
EIAP	environmental impact assessment project
EICC	emergency information and coordination center
EIIS	energy industry identification system
EIP	emergency implementation procedure
EIR	Eidgenossisches Institute für Reaktorforschung (Switzerland)	engineering information request	equipment inoperable record
EIS	effluent inventory system	electrical and instrument shop	electrical isolation scheme	emergency injection system	environmental impact statement	environmental information system
EJ	environmental justice
EKG	effective kilogram
EKMS	Electronic Key Management System
EL	Elettronucleare Italiana (Italy)
ELMS	electrical load monitoring system
ELP	Employees Legal Project
ELPHR	experimental low-temperature process heat reactor
ELR	effectiveness limiting risk
ELS	error-likely situation
ELU	emergency lighting unit
EM	electromagnetic	elevation model	engineering management	environmental management	evaluation model
E/M	electromechanical
E-MAD	engineering, maintenance, assembly, disassembly
EMB	engineering in medicine and biology
EMC	electromagnetic capability	electromagnetic compatibility	emergency management coordinator	engineering mockup critical experiment
EMI	electromagnetic interference	engineering and manufacturing instruction
EMO	electric motor operated
EMOV	electromagnetically operated valve
EMP	electromagnetic pulse
EMR	electromagnetic radiation
EMRV	electromagnetic relief valve
EMS	earthquake monitoring system	emergency management system	Emergency Medical Services
EMT	electrical metallic tubing	emergency management team	executive management team
EN	enforcement notification	event notification
ENC	Exxon Nuclear Company, Inc.
ENDESA	Empresa Nacional de Electricidad, S.A. (Chile)
ENEA	European Nuclear Energy Association
ENEL	Ente Nazionale per l’Energia Elettrica (Italy)
ENERGOATOM	Nuclear Power Utility (Ukraine)
ENI	Electro-Navale et Industrielle, S.A. (Belgium)
ENO	extraordinary nuclear occurrence
ENPI	Ente Nazionale Prevenzione Infortuni (Italy)
ENRESA	Empresa Nacional de Residnos Radiativos (Spain)
ENS	emergency notification system	European Nuclear Society
ENSA	Equipos Nucleares (Spain)
ENSI	Energia Nucleare Sud Italia (Italy)
ENUSA	Empresa Nacional del Uranio, S.A. (Spain)	Energie Nucléaire, S.A. (Switzerland)
EO	emergency officer	enforcement officer	equipment operator
E.O.	Executive Order
EOC	emergency operations center	end of cycle
EOCR	experimental organic-cooled reactor
EOC-RPT	end-of-cycle recirculation pump trip
EOD	explosives ordnance disposal
EOEC	end-of-equilibrium cycle
EOF	emergency operations facility
EOI	emergency operating instruction	Entergy Operations, Inc.
EOL	end of life
EOP	emergency operating plan	emergency operating procedure
EOS	equation of state
EOY	end of year
EP	electric power	emergency plan	emergency planning	emergency power	emergency preparedness	emergency procedure	equipment piece
E/P	electrical to pneumatic
EPA	electrical penetration assembly	engineering plant analyzer	Environmental Protection Agency
EP Act	Energy Policy Act of 1992
EPB	emergency planning basis/bases
EPBE	emergency-planning-basis event
EPC	emergency preparedness coordinator	engineering planning coordinator
EPDC	Electric Power Development Co. Ltd. (Japan)
EPDM	ethylene propylene diene monomer
EPE	emergency plan evolution	emergency preparedness evaluation
EPEC	El Paso Electric Co.
EPFE	electrical penetration filter and exhaust
EPG	emergency procedure guideline
EPI	Environmental Policy Institute
EPIA	emergency preparedness implementation appraisal
EPIP	emergency plan implementing procedure
EPIX	Equipment Performance and Information and Exchange System (replaces NPRDS) (INPO)
EPL	environmental protection limit
EPM	electrical power monitoring	end path manual	engineering project manager	engineering procedure memorandum/memoranda	environmental project manager
EPP	engineering program plan	environmental protection plan
EPR	electromechanical potentiokinetic reactivation	emergency planning requirements	emergency planning review	enhanced participatory rulemaking	essential performance requirement
EPRG	emergency planning review guideline
EPRI	Electric Power Research Institute
EPROM	electronic programmable read-only memory
EPRTCS	emergency power ride-through capability system
EPS	electric power system	emergency power system
EPSL	emergency power switching logic
EPSS	emergency power sequencing subsystem
EPT	ethylene-propylene terpolymer
EPZ	emergency planning zone
EQ	environmental qualification	environmentally qualified	equipment qualification
EQC	equipment qualification coordinator
EQD	environmental qualification document
EQDB	equipment qualification database
EQDF	equipment qualification data file
EQDP	environmental qualification data package
EQEDC	equipment qualification environmental design criterion/criteria
EQML	equipment qualification master list
EQ-TAP	environmental qualification-task action plan	equipment qualification-task action plan
ER	emergency response	environmental report
ERA	Economic Regulatory Administration	Energy Research Abstracts	Energy Reorganization Act
ERB	Executive Resources Board	experiment review board
ERBS	emergency radio broadcast system
ERC	emergency relocation center	emergency response coordinator	Engineering Research Council
ERCOT	Electric Reliability Council of Texas
ERCW	emergency raw cooling water	essential raw cooling water
ERCWS	emergency raw cooling water system
ERDA	Energy Research and Development Administration
ERDAM	Energy Research and Development Administration Manual
ERDS	Emergency Response Data System (NRC)
ERF	emergency response facility	entrainment release factor	explosion release factor
ERFBS	electrical raceway fire barrier system
ERFDADS	emergency response facility data acquisition and display system
ERFIS	emergency response facility information system
ERG	emergency response guideline
ERIE	emergency resources identification equipment
ERIS	emergency response information system
ERL	emergency reference level
ERO	engineering release order
EROD	executive resources and organizational development
EROS	earth resources observation system	electric radiological occurrence system
ERP	elevated release point	emergency response procedure
ERPA	emergency response planning area
ERR	Elk River Reactor
ERS	Economic Research Service
ERSP	earth resources survey program
ERT	emergency repair team	emergency response team	employee response team	event response team
ERTS	environmental radiological technical specification	environmental resources technology satellite
ERV	emergency relief valve
ERVC	external reactor vessel cooling
ES	engineered safeguards	examination standard	extraction steam
E/S	electrical supply
ESADA	Empire States Atomic Development Associates
ESAS	emergency safeguards actuation system	engineered safeguards actuation system
ESCA	extended source calibration area
ESCO	Electrical Steel Company
ESCOM	Electricity Supply Commission (South Africa)
ESCP	employee safety concerns program
ESCWS	essential services cooling water system
ESD	extension shaft disconnect
ESDR	engineered safeguards design rating
ESEERC	Empire State Electric Energy Research Corporation
ESF	engineered safety feature	exploratory shaft facility	Exploratory Studies Facility
ESFA	engineered safety feature actuation
ESFAS	engineered safety features actuation system
ESFS	engineered safety feature system
ESFVS	engineered safety feature ventilation system
ESO	emergency support organization	Engineering Service Organization
ESP	earth-surface potential
ESQ	equipment seismic qualification
ESR	early site review	electron spin resonance	experimental superheat reactor
ESRG	Energy Systems Research Group
ESRP	environmental standard review plan
ESRR	early site review report
ESS	electronic switching system	engagement simulation system	evaporation/solidification system
ES&S	engineering services and safety
ESSA	Environmental Science Services Administration
ESSAR	early site safety analysis report	EBASCO Standard Safety Analysis Report
ESSE	EBASCO Site Support Engineering
ESSP	earliest scram set point
ESW	electroslag welding	emergency service water	essential service water
ESWD	emergency service water discharge
ESWI	emergency service water intake
ESWS	emergency service water screening	emergency service water system	essential service water system
ESWSS	emergency service water supply system
ET	emergency tank	executive team
ETA	equipment transfer aisle	estimated time of arrival
ETBS	elevated tubesheet and baffle sleeve
ETC	estimated time of completion
ETE	evacuation time estimate
ETEC	Energy Technology Engineering Center
ETF	extended task force
ETG	electrical test group
ETL	environmental team leader
ETP	equivalent top product
ETQAP	education and training in quality assurance practices
ETR	engineering test reactor
ETS	elevated tubesheet sleeve	Emergency Telecommunications System	environmental technical specification	events tracking system
E&TT	engineering and technical training
EUB	emergency utility building
EURATOM	European Atomic Energy Community
EV	evaporator vessel	exhaust valve
EVA	early valve actuation
EVCC	ex-vessel core catcher
EVESR	ESADA (Empire States Atomic Development Associates) Vallecitos Experimental Superheat Reactor
EVFM	ex-vessel flux monitor
EVHM	ex-vessel handling machine
EVS	emergency ventilation system
EVST	ex-vessel storage tank
EVTM	external vessel transfer machine	ex-vessel transfer machine
EWEB	Eugene Water and Electricity Board
EWG	exempt wholesale generator
EWST	elevated water storage tank	emergency water storage tank
EXSIS	executive shared information system
EZB	exclusion zone boundary
FA	forced air	fuel assembly	full arc
F/A	fuel assembly
FAA	Federal Aviation Administration	fresh acid add
FaAA	Failure Analysis Associates
FAB	ISOfabrication isometric
FAC	final acceptance criterion/criteria	flow-accelerated corrosion
FACA	Federal Advisory Committee Act
FACNET	Federal Acquisition Computer Network
FAF	Forum Atomique Français (France)
FAI	fail as is
FAP	fatigue action plan
FAPIG	First Atomic Power Industry Group (Japan)
FAR	Federal Acquisition Regulation	Fontenay-aux-Roses Nuclear Research Center (France)	functional analysis report
FARA	Federal Acquisition Reform Act
FARET	fast reactor test assembly
FAS	Federation of American Scientists
FASA	Federal Acquisition Streamlining Act of 1994
FASAB	Federal Accounting Standards Advisory Board
FASB	Financial Accounting Standards Board
FAST	fuel aerosol simulation test	fuel assembly stability test
FATT	fracture appearance transition temperature
FAX	facsimile
FBACS	fuel building air cleanup system
FBC	fluidized bed combustion
FBFC	Société Franco-Belge de Fabrication de Combustible (France)
FBFS	fuel building filter system
FBI	Federal Bureau of Investigation
FBR	fast breeder reactor
FBRF	fast burst reactor facility
FBV	fuel building ventilation
FC	fail closed	fine control	flow controller	fuel cycle
FCA	field change authorization
FCAW	flux cored arc welding
FCD	fine control damper	full core discharge	functional control diagram
FCE	flexible critical experiment
FCG	fatigue crack growth
FCI	Fluid Controls Institute	fuel-coolant interaction
FCN	field change notice
FCO	funds certifying official
FCP	field change package
FCR	fast ceramic reactor	fast conversion ratio	field change request
FCS	Fort Calhoun Station
F&CS	feedwater and condensate system
FCTT	fuel cladding transient tester
FCU	fan coil unit
FCV	flow control valve
Fd	dilution factor (also dF)
F/D	filter/demineralizer
F&D	finding and determination
FDA	final design acceptance	final design analysis	final design approval	final design authorization	Food and Drug Administration
FDAA	Federal Disaster Assistance Administration
FDA-EDRO	Food and Drug Administration, Office of Executive Director of Regional Operations
FDB	Fahrenheit dry bulb
FDC	functional design criterion/criteria
FDDR	field deviation disposition request
FDG	fluid distribution grid
FDI	field disposition instruction
FDLP	Federal Depository Library Program (GPO)
FDM	frequency division multiplex
FDR	final design report	functional design requirement
FDS	final docketed special	fire detection system	floor drain system
FDSA	facility description and safety analysis/analyses
FDT	floor drain tank
FDTS	floor drain treatment system
FDW	feedwater
FE	flow element
FEA	Federal Energy Administration	front-end analysis/analyses
FECCSR	failure of emergency core cooling system recirculation
FEDAL	failed element detection and location	fuel element detection and location
FEDP	Federal Executive Development Program
FEF	foreign event file	fuel examination facility	fusion energy foundation
FEFP	fuel element failure propagation
FEFPL	fuel element failure propagation loop
FEGLI	Federal Employees’ Group Life Insurance
FEIS	final environmental impact statement	full electrical isolation scheme
FELAP	finite element analysis program
FEMA	Federal Emergency Management Agency
FEO	facility emergency organization
FEP	facility emergency plan
FEPCA	Federal Employees Pay Comparability Act of 1990
FERC	Federal Energy Regulatory Commission
FERD	fuel element rupture detection
FERMILAB	Fermi National Accelerator Laboratory
FERP	fire emergency response plan
FERS	Federal Employees’ Retirement System
FES	final environmental statement
FF	filter factor	fluorine facility
FFD	fitness for duty
FFE	Federal field exercise	FRERP (Federal Radiological Emergency Response Plan) field exercise	full field exercise
FFF	fuel failure fraction
FFI	full field investigation
FFLA	Family Friendly Leave Act
FFLS	failed fuel location subsystem
FFM	fuel failure mockup
FFP	fuel fabrication plant
FFR	folded flow reactor
FFRDC	Federally Funded Research and Development Center
FFTF	fast flux test facility
FFTFPO	Fast Flux Test Facility Project Office
FFWT	final feedwater temperature
FG	fission gas
FGAA	Federal Government Accountants Association
FGEL	Fitchburg Gas and Electric Light Co.
FGM	fission gas monitor
FGS	Fulton Generating Station
FHAR	fire hazards analysis report
FHAVS	fuel-handling area ventilation system
FHB	fuel-handling building
FHBVI	fuel-handling building ventilation isolation
FHBVS	fuel-handling building ventilation system
FHC	fuel-handling cell
FHE	fuel-handling equipment
FHES	fuel-handling equipment system
FHFP	full height, full pressure
FHIS	fuel-handling isolation signal
FHOB	fuel-handling operator booth
FHP	fuel-handling procedure
FHPC	fuel-handling and preparation cell
FH&RM	fuel-handling and radioactive maintenance
FHS	fuel-handling system
FHSR	final hazards safety report	final hazards summary report
FHT	feedwater holding tank
FHU	fuel-handling unit
FI	flow indicator
FIA	Factory Insurance Association
FIAS	flow indicator alarm switch
FIEN	Forum Italiano dell’Energia Nucleare (Italy)
FIFO	first in, first out
FIM	field inspection manual
FIMA	fission per initial heavy metal atom
FIN	financial identification number
FIP	Federal information processing	field inspection procedure
FIPS	Federal information processing standard
FIR	food irradiation reactor
FIRM	failure introspection in rotating machinery
FIRMR	Federal Information Resources Management Regulation
FIRR	Federal Institute for Reactor Research (Switzerland)
FIRS	field incident radio system
FISC	fuel inspection and sampling cell
FIST	full integral simulation test
FIT	flow indicator transmitter
FIV	flow-induced vibration
FIVE	fire-induced vulnerability evaluation
FJO	field job order
FLAME	flame acceleration measurement and experiment
FLD	fuel-loading data
FLECHT	full-length emergency cooling heat transfer
FLIP	floating index point	fuel lifetime improvement program
FLIT	free limiting internal truss
FLST	full-length source term
FLTS	full-length tubesheet sleeve
FM	Factory Mutual	fracture mechanics	frequency multiplier
FMCRD	fine motion control rod drive
FME	foreign material exclusion
FMEA	Factory Mutual Engineering Associates	failure modes and effects analysis/analyses
FMEF	fuels and materials examination facility
FMF	fuel-melt fraction
FMIT	fusion materials irradiation test
FMRC	Factory Mutual Research Corporation
FMS	flux monitoring system
FNB	Forum Nucléaire Belge (Belgium)
FNP	floating nuclear plant
FNR	Ford Nuclear Reactor
FO	fail open
FOA	forced oil and air
FOAKE	first-of-a-kind engineering
FOCI	foreign ownership, control, or influence
FOE	Friends of the Earth
FOGG	feed-only-good generator
FOIA	Freedom of Information Act
FOL	facility operating license
FONSI	finding of no significant impact
FONUBEL	Forum Nucléaire Belge (Belgium)
FOR	forced outage rate (NRC performance indicator)
FORATOM	Forum Atomique Européen
FORC	fluorinator off-gas recycle compressor
FOSAR	foreign object search and retrieval
FOTA	fuels open test assembly
FP	fire protection	fission product	full power
FPC	Federal Power Commission	Florida Power Corporation	fuel pool cooling
FPCC	fuel pool cooling and cleanup
FPCCS	fuel pool cooling and cleanup system
FPCSTL	fission product control screening test loop
FPD	full-power day
FPDD	final project design description
FPDI	food processing development irradiator
FPEB	fuel pool exhaust blower
FPFI	fire protection functional inspection
FPL	Florida Power & Light Co.	full performance level
FP&L	Florida Power & Light Co.
FPM	Federal Personnel Manual
FPMR	Federal property management regulation
FPO	Federal Preservation Officer
FPOL	full-power operating license
FPPH	fire protection pump house
FPPVS	fuel pool pump ventilation system
FPR	Federal procurement regulation	flexible plastic reactor
FPS	final policy statement	fire protection system	Fluor Power Services, Inc.
FPSL	fission product screening loop
FPT	feedwater pump turbine	fission product test
FP-TAP	Fire Protection–Task Action Plan
FPWT	fuel pool water treatment
FQC	field quality control
FR	Federal Register
FR	final rule	flow regulator	friction ratio
FRA	flow recorder and alarm
FRAB	fuel receiving air blower
FRAC	Federal Regional Assistance Committee
FRAF	fuel receiving air filter
FRAMATOME	Société Franco-Américaine de Constructions Atomiques (France)
FRAP	fuel rod analysis program
FRAP-S	fuel rod analysis program–steady-state
FRAP-T	fuel rod analysis program–transient
FRB	Forschungsreaktor Berlin (Germany)
FRC	Federal Radiation Council	Federal Records Center	Federal Response Center	Fire Research Center	flow recording controller	fractional relief capacity	Franklin Research Center
FRCS	flow recording controller switch
FRCTF	fast reactor core test facility
FRD	formerly restricted data
FRERP	Federal Radiological Emergency Response Plan
FRF	fuel reprocessing facility
FRMAC	Federal Radiological Monitoring and Assessment Center
FRMAP	Federal Radiological Monitoring and Assessment Plan
FRN	Federal Register notice
FRN	formal report number
FRP	Federal Response Plan	fuel reprocessing plant
FRPCC	Federal Radiological Preparedness Coordinating Committee
FRS	fast reactor safety	fixed radial shield	floor response spectrum/spectra	fuel receiving station
FRSF	fuel receiving and storage facility
FRTEF	fast reactor thermal engineering facility
FS	factor of safety	far side	finishing superheater	flow switch
FSAR	final safety analysis report
FSC	Federal supply classification	Federal supply code
FSCR	fuel storage control room
FSCS	fuel storage cable spread
FSEB	fuel storage exhaust blower
FSER	final safety evaluation report
FSF	fuel storage facility
FSI	fluid-structure interaction
FSN	Federal stock number
FSNM	formula quantity of strategic special nuclear material
FSP	fuel storage pool
FSPA	fuel storage personnel area
FSPB	fuel storage processing building
FSPPR	fast supercritical pressure power reactor
FSPVS	fuel storage pool ventilation system
FSR	fast source reactor	First Soviet Reactor
FS&R	filling, storage, and remelt
FS&RS	filling, storage, and remelt system
FSS	Federal Supply Service	fire suppression system	floor service station
FSSAR	final standard safety analysis report
FSTF	full-scale test facility
FSU	former Soviet Union
FSV	Fort St. Vrain
FSVNGS	Fort St. Vrain Nuclear Generating Station
FT	fault tree	flow transmitter
FTA	fault tree analysis/analyses
FTC	Federal Telecommunications Center	fuel temperature coefficient	fuel transfer canal	fuel transfer cask
FTE	FFTF (fast flux test facility) test engineering	fracture transition elastic	full-time equivalent
FTI	Framatome Technologies, Inc. (formerly Babcock & Wilcox)
FTL	full-term license	full-time license
FTM	functional test matrix
FTOL	full-term operating license
FTP	FFTF (fast flux test facility) test procedure	file transfer protocol	fracture transition plastic	fuel transfer pool	fuel transfer port
FTR	fast test reactor	Federal travel regulation
FTRC	Federal Telecommunications Records Center
FTRIA	flow and temperature removable instrument assembly
FTS	Federal Telecommunications Services	fuel transfer system
FT&SA	fuel transfer and storage assembly
FTTM	few-tube test model
FTTS	flow-through tube sampler
FTU	formazine turbidity unit
FUETAP	formed under elevated temperature and pressure
FUFO	fuel fusing option
FUSE	Floridians United for Safe Energy, Inc.
FUSRAP	formerly utilized sites remedial action program
FV	floor valve	Fussell Vesely
FVA	floor valve adapter
FVC	filtered vented containment
FVCS	filtered vented containment system
FW	feedwater	field weld	Foster Wheeler Corp.
FWB	Fahrenheit wet bulb
FWC	feedwater control
FWCI	feedwater coolant injection
FWCS	feedwater control system
FWEC	Foster Wheeler Energy Corp. (subsidiary of Foster Wheeler Corp.)
FWHM	full width half maximum
FWIV	feedwater isolation valve
FWLB	feedwater line break
FWLC	feedwater level control system
FWP	Federal Women’s Program
FWPAC	Federal Women’s Program Advisory Committee
FWPB	feedwater pipe break
FWPCA	Federal Water Pollution Control Act
FWRA	Federal Workforce Restructuring Act of 1994
FWRV	feedwater regulating valve
FWS	feedwater supply	feedwater system
F&WS	Fish and Wildlife Service
FWSDR	final working system design review
FWSH	fresh water supply header
FWST	fueling water storage tank
FY	fiscal year
FYP	five-year plan
FZS	Forschungszentrum Seibersdorf, G.m.b.H. (Austria)
GA	gas analysis/analyses	General Atomics (before 1988, GA Technologies, Inc.)	grapple adapter
GAAA	Groupement pour les Activités Atomiques et Avancées (France)
GAE	general analytical evaluation
GAEC	Greek Atomic Energy Commission
GAHF	grapple adapter handling fixture
GALE	gaseous and liquid effluent
GALL	generic aging lessons learned
GAMAS	General Atomics material assay system
GAN	Gosatomnadzor (Russia)
GAO	General Accounting Office
GAP	Georgia Power Co.	Government Accountability Project
GAPCO	Georgia Power Company
GASSAR	General Atomics Standard Safety Analysis Report	Gilbert Associates Standard Safety Analysis Report
GATT	General Agreement on Tariffs and Trade
GBHC	Great Bay Holdings Corp.
GBPC	Great Bay Power Company
gBq	gigabecquerel
GBR	gas-cooled breeder reactor
GBRA	Gas-Cooled Breeder Reactor Association (Belgium)
GBSR	graphite-moderated boiling and superheating reactor
GC	gas chromatograph
GCB	gravity cutback
GCBR	gas-cooled breeder reactor
GCCA	generic compliance and communications activity
GCEP	gas centrifuge enrichment plant
GCFBR	gas-cooled fast breeder reactor
GCH	gas collection header
GCHWR	gas-cooled, heavy-water-moderated reactor
GCI	Generic Communications Index
GCL	gas-cooled loop
GCR	gas-cooled reactor
GCRA	Gas-Cooled Reactor Associates
GCRE	gas-cooled reactor experiment
GCS	glued cylindrical specimen
GCSS	graphite core support structure
GDC	general design criterion/criteria
GDP	gaseous diffusion plant
GDS	general declassification schedule	graphical display system
GDT	gas decay tank
GE	General Electric Co.
GEAP	General Electric Atomic Products
GEC	General Electric Co. (United Kingdom)	General Electrodynamics Corp.
GEIS	generic environmental impact statement	generic environmental impact study
GEM	graphical evaluation module
GENE	General Electric Nuclear Energy
GEN&SIS	Geographical, Environmental, and Siting Information System
GENTR	General Electric Nuclear Test Reactor
GERA	General Engineering Research and Applications (Belgium)
GERP	general employee retraining program
GERS	general equipment ruggedness spectrum/spectra
GES	generic environmental statement
GESMO	Generic Environmental Statement on Use of Mixed Oxide Fuel
GESSAR	General Electric Standard Safety Analysis Report
GESTAR	General Electric Standard Application for Reactor Fuel
GET	general employee training
GETAB	General Electric Thermal Analysis Basis
GETP	general employee training program
GETR	General Electric Test Reactor
GETSCO	General Electric Technical Services Co.
GFE	Government-furnished equipment
GFE&M	Government-furnished equipment and material
GFES	generic fundamentals examination section
GFFD	gross failed fuel detector
GFK	Gesellschaft für Kernforschung, m.b.H. (Germany)
GFP	Government-furnished property
GFY	Government fiscal year
GG	generator gas
GGA	Gulf General Atomic
GGNS	Grand Gulf Nuclear Station
GH	gate house
G&H	Gibbs & Hill, Inc.
GI	gastrointestinal	generic issue
GIBBSSAR	Gibbs and Hill, Inc., Standard Safety Analysis Report
GIC	geomagnetically induced current
GIDEP	Government-Industry Data Exchange Program
GIF	gamma irradiation facility
GIFT	gas-insulated flow tube
GIIN	Groupe Intersyndical de l’Industrie Nucléaire (France)
GILS	Government Information Locator Service
GIMCS	Generic Issue Management Control System
GIP	generic implementation procedure
GIS	geographic information system	geologic information system
GKM	Grosskraftwerk Mannheim, A.G. (Germany)
GKN	Gemeenschappelijke Kernenergiecentrale Nederland N.V. (Netherlands)	Gemeinschaftskernkraftwerk Neckar, G.m.b.H. (Germany)
GKT	Gemeinschaftskernkraftwerk Tullnerfeld, G.m.b.H. (Austria)
GKW	Gemeinschaftkraftwerk Weser, G.m.b.H. (Germany)
GL	generic letter	Government liaison
GLASS	germanium-lithium-argon scanning system
GLDB	General License Database
GLEEP	Graphite Low-Energy Experimental Pile (United Kingdom)
GLRP	Generic License Renewal Program
GLRWS	gaseous and liquid radioactive waste system
GM	Geiger-Müller (Mueller)
GMAW	gas metal arc weld/welding
GMPC	Green Mountain Power Corp.
GMRA	Government Management Reform Act of 1994
GMT	Greenwich mean time
GN	general notice
GNGS	Genoa Nuclear Generating Station
GNPP	R.E. Ginna Nuclear Power Plant
GNS	Gesellschaft für Nuklear-Service, m.b.H. (Germany)
GO-CO	Government owned/contractor operated
GOI	general operating instruction
GORX	graphite oxidation from reactor excursion
GOS	group operating service
GP	general purpose	generic project
GPA	Governmental and Public Affairs, Office of (NRC)
GPC	Georgia Power Company
GPCL	general purpose closed loop
GPE	general purpose evaporator
GPL	general purpose loop
GPO	Government Printing Office
GPO	FDLPGPO Federal Depository Library Program
GPP	general plant project
GPR	Groupe Permanent Chargé des Réacteurs Nucleaires
GPRA	Government Performance and Results Act of 1994
GPS	global positioning system
GPT	general plant telephone
GPU	General Public Utilities Corp.
GPUN	GPU (General Public Utilities) Nuclear Corp.
GPUSC	GPU (General Public Utilities) Service Corp.
GQA	graded quality assurance
GRC	generation review committee
GRI	Gas Research Institute
GRR	Greek Research Reactor
GRS	gaseous radwaste system	geoscience and remote sensing	Gesellschaft für Alagen-und Reaktorsicherheit, m.b.H. (Germany)
GRSA	General Radioquimica, S.A. (Spain)
GRT	general reactor technology
GRWS	gaseous radioactive waste system
GS	gland seal
GSA	General Services Administration
GSB	general services building
GSC	gland seal condenser	gland steam condenser	Global Strategy Council
GSD	generating significant dose
GSER	generic safety evaluation report
GSH	gas surge header
GSI	generic safety issue
GSLO	gland seal leakoff
GSPS	generating station protection system
GSR	gland steam regulator
GST	gas surge tank
GSU	generator stepup	Gulf States Utilities Co.
GTA	gas tungsten arc	guide tube assembly
GTAW	gas tungsten arc weld
GTCC	greater than Class C
GTG	gas turbine generator
GT-HTGR	gas-turbine high-temperature gas-cooled reactor
GTIG	Gamma Thermometer Interest Group
GTL	gaseous tritium light
GTLS	gaseous tritium light source
GTR	ground test reactor
GTRR	Georgia Technology Research Reactor
GTTF	gas-turbine test facility
GUI	graphical user interface
GUNFCO	Gulf United Nuclear Fuels Corporation
GV	guard vessel
GVR	gas volume ratio
GVW	gross vehicle weight
GWAC	Government-wide agency contract
GWD	gaseous waste disposal
GWMS	gaseous waste management system	gas-water module storage
GWPS	gaseous waste processing system
GWS	gaseous waste system
GWTT	ground-water travel time
Gy	gray
H/A	hand/automatic
HAA	head access area
HAAUP	hanger and analysis update program
HAC	high alumina cement
HACL	Harvard Air Cleaning Laboratory
HAD	heat-activated device	heat-actuated device
HAFM	helium accumulation fluence monitor
HAN	hydroxylamine nitrate
HAP	hafnium column product
HAPS	Houston automatic priority spooling
HAS	holding action system
HASL	Health and Safety Laboratory
HAW	high acid waste
HAX	hafnium column extractant
HAZ	heat-affected zone
HAZCAP	Hazard Communication Compliance Assistance Program (U.S. Occupational Safety and Health Administration)
HAZEL	Homogeneous Assembly Zero Energy Laboratory
HB	handbook	horizontal baffle
HBA	horizontal baffle assembly
HBP	hydrogen behavior program
HBPP	Humboldt Bay Power Plant
HBR2	H. B. Robinson Steam Electric Plant, Unit 2
HBS	hydrogen burn survivability
HBWR	Halden Boiling Heavy Water Reactor (Norway)
HCDA	hydrodynamic core-disruptive accident	hypothetical core-disruptive accident
HCDB	heat code database
HCE	human-caused error
HCGS	Hope Creek Generating Station
HCLF	horizontal cask lifting fixture
HCLPF	high confidence in low probability of failure
HCM	hydraulic core mockup
HCOG	Hydrogen Control Owners Group
HCS	hydrazine control system	hydrogen control system
HCSS	head compartment support structure
HCTL	heat capacity temperature level
HCU	hydraulic control unit
HCV	hand control valve	hydraulic control valve
HCW	hafnium column waste
HDGR	high-density gas reactor
HDO	Headquarters duty officer
HDR	Heissdampfreaktor (Germany)	high dose rate	hot dry rock
HDT	heated detonation tube
HDW	high-pressure demineralized water
HE	human error
HEARTHFIRE	high-energy accelerator reactor for thermonuclear fusion with ion beam of relativistic energy
HECTOR	Hot, Enriched, Carbon-Moderated, Thermal-Oscillator Reactor (United Kingdom)
HED	historical earthquake data	human engineering deficiency	human engineering discrepancy
HEDL	Hanford Engineering and Development Laboratory
HEHF	Hanford Environmental Health Foundation
HEI	Heat Exchanger Institute
HEJ	hybrid expansion joint
HELB	high-energy line break
HELBA	high-energy line break analysis/analyses
HELCO	Hartford Electric Light Co.
HELP	Health and Energy Learning Project
HEM	homogeneous equilibrium model
HEP	human-error probability
HEPA	high-efficiency particulate air
HEPB	high-energy pipe break
HER	human-error rate
HERALD	Heterogenous Experimental Reactor, Aldermaston (United Kingdom)	High Enriched Reactor, Aldermaston (United Kingdom)
HERMES	Heavy Element and Radioactive Material Electromagnetic Separator (United Kingdom)
HERO	Hazards of Electromagnetic Radiation to Ordnance Reactor (United Kingdom)
HES	Hanford Engineering Service
HET	horizontal electrical tunnel
HETS	height equivalent to a theoretical stage
HEU	highly enriched uranium
HEW	Hamburgische Electrizitäts-Werke, A.G. (Germany)
HEX	uranium hexafluoride
HFAR	hardware failure analysis report
HFBR	high-flux beam reactor
HFCE₂	high-flux critical experiment₂
HFE	human factors engineering
HFED	high-frequency envelope detection
HFEF	hot fuel examination facility
HFIR	high-flux isotope reactor
HFP	hot full power
HFPP	human factors program plan
HFR	high-flux reactor
HFRG	human factors review group
HFT	hot functional testing
HG	hydrogen gas
HGE	hydraulic grade elevation
HGMS	high gradient magnetic separator
HG/NG	hydrogen gas/nitrogen gas
HHLR	Horace Hardy Lestor Reactor
HHS	Health and Human Services, U.S. Department of
HHSI	high-head safety injection
HHW	high-heat waste
HI	Hydraulic Institute
H&I	harassment and intimidation
HIC	hand indicator controller	high-integrity container
HI-C	high conversion–critical
HI&D	harassment, intimidation, and discrimination
HID	high-impact design	high-intensity discharge
HIFAR	High-Flux Australian Reactor
HIFRENSA	Hispano-Francesa de Energía Nuclear, S.A. (Spain)
HIL	helium impurities loop
HILAC	heavy ion linear accelerator
HILC	high intermediate level cell
HIP	Hanford Isotopes Plant
HIPA	high-speed interactive plant analysis/analyses
HIPOW	hot isostatic pressing of waste
HIPS	hoist integrated protective system
HIR	hanger inspection report
HIRDL	High-Intensity Radiation Development Laboratory
HIS	hydrogen igniter system	hydrogen ignition system
HITC	Hydraulic Institute test code
HJTC	heated junction thermocouple
HKG	Hochtemperatur-Kernkraftwerk, G.m.b.H. (Germany)
HLB	hot laboratory building
HLC	high-level cell
HLCS	high-level compaction station
HLCV	hot-leg check valve
HLIV	hot-leg isolation valve
HLLWT	high-level liquid waste tank
HLNCC	high-level neutron coincidence counter
HLO	high-level override
HL&P	Houston Lighting & Power Co.
HLRW	high-level radioactive waste
HLSW	high-level solidified waste
HLW	high-level liquid waste	high-level radioactive waste	high-level waste
HLWC	high-level waste calcination	high-level waste concentrate
HLWD	high-level waste distillate
HLWF	high-level waste feed
HLWOG	high-level liquid waste off-gas
HLWR	high-level waste repository
HLWS	high-level waste surge
HM	heavy metal
HMS	Hanford Meteorology Survey	hydrogen mixing system
H&N	Holmes and Narver, Inc.
HNL	Holifield National Laboratory
HNNP	Haddam Neck Nuclear Plant
HNP	Haddam Neck Nuclear Plant	Hartsville Nuclear Plant
HNPF	Hallam Nuclear Power Facility
HO	hydraulic operator
HOG	head off-gas
HOO	headquarters operations officer
HOP	HEDL (Hanford Engineering Development Laboratory) overpower
HOTCE	hot critical experiment
HOV	hydraulic-operated valve
HP	Edwin I. Hatch Plant	hanger package	health physicist	health physics	high pressure	high purity
HPC	health physics center	hot pipe chase
HPCF	high-pressure core flooder
HPCI	high-pressure coolant injection
HPCIS	high-pressure coolant injection system
HPCS	high-pressure core spray
HPD	high-power density
HPED	Human Performance Event Database
HPES	human performance evaluation system
HPFL	high-performance fuels laboratory
HPFP	high-pressure fire protection
HPI	high-pressure injection
HPIP	Human Performance Investigation Process
HPIS	high-pressure injection system
HPME	high-pressure melt ejection
HPN	health physics network
HPOF	high-pressure oil fill	high pressure, oil filled
HPP	health physics program	hot processing plant
HPPP	Human Performance Program Plan
HPR	high-pressure recirculation
HPRR	health physics research reactor
HPRS	high-pressure recirculation system
HPS	Hanford Plant standard	Health Physics Society	health physics station	helium purification system	hydrogen purge system
HPSI	high-pressure safety injection
HPSIP	high-pressure safety injection pump
HPSP	high-power set point
HPSW	high-pressure service water
HPSWS	high-pressure service water system
HPT	high-pressure turbine	hot pipe tunnel
HPU	hydraulic power unit
HQ	Hydro-Quebec (Canada)
HR	hard rock	Human Resources, Office of (NRC)	hydrogen recombiner
HRA	Human Reliability Analysis
HRB	Hochtemperatur-Reaktorbau, G.m.b.H. (Germany)
HRE	homogeneous reactor experiment
HRIS	human resources information system
HRM	human resources management
HRP	Halden Reactor Project
HRPS	hydrogen recombination and purge system
HRRM	high-range radiation monitor
HRS	heat rejection system
HRT	homogeneous reactor test
HS	hand switch	hot shop
HSI	human system interface
HSO	hydrogen seal oil
HSP	hot-shutdown panel
HSST	heavy section steel technology
HSW	heat sink welding
HSWA	Hazardous and Solid Waste Amendments
HSWH	high solid waste header
HTB	hafnium test blade
HTFFT	heat transfer fluid flow thermodynamics
HTGCR	high-temperature gas-cooled reactor
HTGR	high-temperature gas-cooled reactor	high-temperature gas reactor
HTGR-CX	high-temperature gas reactor critical experiment
HTIS	heat transfer instrument system
HTL	heat transfer loop
HTLTR	high-temperature lattice test reactor
HTM	high trajectory missile
HTPC	Hayward Tyler Pump Company
HTR	Hanford Test Reactor	high-temperature reactor	Hitachi Training Reactor (Japan)
HTRDA	High-Temperature Reactor Development Associates
HTRE	heat transfer reactor experiment
HTRI	Heat Transfer Research Institute
HTS	heat transfer system	heat transport system
HTSF	high-temperature sodium facility
HTTP	hypertext transfer protocol
HTV	half thickness value
H/U	heatup
HU	hydraulic unit
HUGHES-NEL	Hughes Aircraft Company Nuclear Electronics Laboratory
HULP	Hudson Light and Power Dept.
HUT	HEDL (Hanford Engineering Development Laboratory) up transient	holdup tank
HV	hand valve
H&V	heating and ventilation
HVAC	heating, ventilation, and air conditioning
HVD	heaters, vents, and drains
Hvdc	high-voltage direct current
HVH	hydrogen vent header
HVSU	heating and ventilating supply unit
HW	heavy water	hot water	hotwell
HWC	hydrogen water chemistry
HWCTR	heavy-water components test reactor
HWGCR	heavy-water-moderated, gas-cooled reactor
HWH	hot water heating
HWLC	hotwell level control
HWLWCR	heavy-water-moderated, boiling light-water-cooled reactor
HWP	heavy-water plant
HWR	heavy-water reactor	hot water return
HWS	Hanford work specification	Hanford work standard
HWSF	hazardous waste storage facility
HWWVS	hardened wetwall vent system
HX	heat exchange	heat exchanger
HYPO	high-power water-boiler reactor
HZP	hot zero power
IA	industry application	insertion approval	instrument air
I/A	isolation amplifier
I&A	identification and authentication
IAA	interim access authorization
IAC	interim acceptance criterion/criteria
IAD	immediate action directive
IAE	instrumentation and electrical
IAEA	International Atomic Energy Agency
IAEC	Israel Atomic Energy Commission
IAG	incident analysis group
IAL	immediate action letter
IALL	intermediate activity level liquid [system]
IANEC	Inter-American Nuclear Energy Commission
IAP	independent assessment program	integrated action plan	Iowa Power
IAPG	Interagency Advanced Power Group
IAPMO	International Association of Plumbing and Mechanical Officials
IAR	irradiation-anneal-reirradiation
IAS	instrument air system
IASCC	irradiation-assisted stress-corrosion cracking
IAT	information assessment team
IATI	integrated assessment team inspection
IAW	in accordance with
IB	inner bremsstrahlung
IBA	inner blanket assembly	intermediate break accident
IBEW	International Brotherhood of Electrical Workers
IBJ	Industrial Bank of Japan, Ltd.	Instytut Badán Jadrowych (Poland)
IBM	International Business Machines Corp.
IBSHR	integral boiling and superheat reactor
IC	indicating controller	Internuclear Co.	isolation condenser
I&C	instrumentation and control
ICA	item control area
ICAP	International Code Assessment Program
ICAR	interface control action request
ICAVP	independent corrective action verification program
ICB	information collection budget	interface control board
ICBWR	improved cycle boiling-water reactor
ICC	inadequate core cooling	information collection coordinator	Interstate Commerce Commission
ICCDP	incremental conditional core damage probability
ICCGR	international cyclic crack growth rate
ICCU	interchannel comparison unit
ICCW	in-containment chilled water
ICD	interface control diagram	interface control document	interface control drawing
ICE	implicit continuous-fluid Eulerian
ICEA	Insulated Cable Engineers Association
ICES	integrated civil engineering system
ICI	ice condenser instrumentation	in-core instrumentation
ICODS	Interagency Committee on Dam Safety
ICONS	Information Center on Nuclear Standards
ICP	inert carrier process	instrument calibration procedure	inventory control point
ICPP	Idaho Chemical Processing Plant
ICRA	Interagency Committee on Radiological Assistance
ICRI	incomplete control rod insertion
ICRP	International Commission on Radiological Protection
ICRS	instrument calibration and recall system
ICRU	International Commission on Radiation Units and Measurements
ICS	instrumentation and control system	integrated control system	intercommunication system	iodine cleanup system
ICSA	in-core shim assembly
ICSD	ionization chamber smoke detector
ICV	independent construction verification
ID	inner diameter	inside diameter	inventory difference
IDA	intrusion detection alarm
IDAS	intermediate dose assessment system
IDCA	independent design and construction assessment
IDCOR	Industry Degraded-Core Rulemaking Program
IDCV	independent design and construction verification
IDENTIFY	Instituto de Engenharia Nuclear (Brazil)
IDI	independent design inspection	integrated design inspection
IDLH	immediate danger to life and health
IDMS	isotope dilution mass spectrometry
IDNS	Illinois Department of Nuclear Safety
IDOT	Illinois Department of Transportation
IDP	Individual Development Plan (NRC Form 321)
IDR	independent design review	inspection discrepancy report	interface data report
IDS	interim decay storage	intermediate decay storage	isotope detection system
IDT	integrated design team
IDV	independent design verification
IDVP	independent design verification program
IE	industrial electronics	initiating event	Inspection and Enforcement, Office of (NRC)	irradiation effect
I&E	internally and externally
IEA	Instituto de Energia Atomica (Brazil)	International Energy Agency
IEAR	Instituto de Energia Atomica Reactor (Brazil)
IEB	IE (Office of Inspection and Enforcement) bulletin
IEC	International Electrotechnical Commission
IED	improvised explosive device
IEEE	Institute of Electrical and Electronics Engineers
IEG	items evaluation group
IELP	Iowa Electric Light & Power Co.
IEM	interim examination and maintenance
IEMTF	interim examination and maintenance training facility
IEN	IE (Office of Inspection and Enforcement) notice
IEOTSG	integral economizer once-through steam generator
IES	Illumination Engineering Society	Institute of Environmental Sciences	irradiation effects simulation
IESB	iron-enriched synthetic basalt
IET	initial engine test
IFA	instrument fuel assembly
IFB	invitation for bids
IFBA	integral fuel burnable absorber
IFCA	instrumentation to follow the course of an accident
IFCF	integrated fuel cycle facility
IFCI	integrated fuel-coolant interaction
IFE	Institut for Energiteknikk (Norway)
IFI	inspector followup item
IFM	intermediate flow mixing
IFMIS	integrated financial management information system
IFPT	integrated fission product transport
IFR	integral fast reactor
IFTS	irradiated fuel transfer station	irradiated fuel transfer system
IG	Inspector General
IGA	intergranular attack
IGCE	Independent Government Cost Estimate
IGLD	International Great Lakes Datum
IGRP	inert gas receiving and processing
IGR&P	inert gas receiving and processing
IGRPS	inert gas receiving and processing system
IGSCC	intergranular stress-corrosion cracking
IGT	instrument guide tube
IH	integrated head
IHSI	induction heating stress improvement	induction heat stress improvement	intermediate head safety injection
IHTS	intermediate heat transport system
IHX	intermediate heat exchanger
IHXGV	intermediate heat exchanger guard vessel
IIE	Instituto de Investigaciones Electricas (Mexico)
IIF	internals indexing fixture
IIGE	Iowa-Illinois Gas and Electric Co.
IIP	Incident Investigation Program	in-core instrument penetration
IIRC	Incident Investigation Review Committee
IIS	integrated implementation schedule
IIT	Illinois Institute of Technology	Incident Investigation Team	Indian Institute of Technology
IKRD	inverse kinetics rod drop
ILC	intermediate level cell
ILIP	in-line instrument package
ILLW	intermediate-level liquid waste
ILO	International Labour Organisation
ILPR	Illinois Power Co.
ILRT	integrated leak rate test	integrated leak rate testing
ILSW	intermediate-level solid waste
ILW	intermediate-level waste
ILWC	intermediate-level waste concentrate
ILWD	intermediate-level waste distillate
ILWF	intermediate-level waste feed
ILWS	intermediate-level waste storage
IM	information management	instrumentation and measurement	integrated master
IMA	independent management appraisal
IMAS	impurity monitoring and analysis system
IMC	incident management center	Inspection Manual chapter
IMCO	Inter-Government Maritime Consultative Organization
IMECo	Indiana & Michigan Electric Company
IMP	instrument maintenance procedure
IMPAC	International Merchant Authorization Card
IMPCo	Indiana Michigan Power Company
IMPEP	Integrated Material Performance Evaluation Program
IMPR	Indiana & Michigan Power Co.
IMS	in-core monitoring system	ion mobility spectrometer
IN	information notice
INB	Internationale Natrium-Brutreaktor-Bau, G.m.b.H. (Germany)
INC	Idaho Nuclear Corporation
INCA	in-core analysis/analyses	inner neutron control assembly
INCB	International Nuclear Credit Bank
INCOT	in-core test
IND	investigational exemption of a new drug
INDE	inservice nondestructive examination
INDEX	integrated nuclear data exchange
INEC	Idaho Nuclear Energy Commission
INEEL	Idaho National Engineering and Environmental Laboratory (formerly INEL)
INEL	Idaho National Engineering Laboratory (now INEEL)
INER	Institute of Nuclear Energy Research (Taiwan)
INES	international nuclear event scale
INFCE	International Nuclear Fuel Cycle Evaluation
ININ	Instituto Nacional de Investigaciones Nucleares (Mexico)
INIS	International Nuclear Information System
INITEC	Empresa Nacional de Ingeniería y Tecnología, S.A. (Spain)
INLA	International Nuclear Law Association
INMM	Institute of Nuclear Materials Management
INPO	Institute of Nuclear Power Operations
INR	immediate notification report
INS	Immigration and Naturalization Service
INSAG	International Nuclear Safety Advisory Group
INSRP	Interagency Nuclear Safety Review Panel
INTERATOM	Internationale Atomreaktorbau, G.m.b.H. (Germany)
INTLO	International Nuclear Technology Liaison Office
INX	ion exchange
I/O	input/output
IOAA	Independent Offices Appropriation Act of 1952
IOE	industry operating experience
IOERS	integrated operating experience reporting system
IORV	inadvertently opened relief valve
IOSRV	inadvertent opening of a safety/relief valve
IP	inspection procedure
I&P	inerting and preheating
IPA	Intergovernmental Personnel Act	iterative performance assessment
IPAC	International Participants Advisory Committee (Institute of Nuclear Power Operations)
IPAP	integrated performance assessment process	integrated performance assessment program
IPAS	Inspection Procedure Authority System
IPB	illustrated parts breakdown
IPC	Interjurisdictional Planning Committee
IPCEA	Insulated Power Cable Engineers Association
IPDD	initial project design description
IPE	individual plant examination	integrated plant evaluation
IPEEE	individual plant examination of external events
IPF	iodine protection factor
IPHT	in-process heat treatment
IPIRG	International Piping Integrity Research Group
IPL	initial program load
IPP	independent power producer	integrated plotting package
IPR	initial pressure regulator
IPRDS	in-plant reliability data system
IPRN	in-process rework notice
IPS	Indian Point Station	interim policy statement	investment protection subsystem	Iowa Public Service Company	iron pipe size
IPSAR	integrated plant safety assessment report
IPSN	Institute of Nuclear Safety and Protection (France)
IPTS	integrated pressurized thermal shock
IpyC	inner pyrolytic carbon
IR	information request	inspection report	intermediate range
IRA	integrated review of assessment
IRAC	Interdepartmental Radio Advisory Committee
IRACT	incident response action coordination team
IRAP	Interagency Radiological Assistance Plan	Interagency Radiological Assistance Program
IRB	inside reactor building	Istituto Ricerche Breda, SpA (Italy)
IRC	incident response center	Indiana Regional Cancer (Center)	internal review committee
IRE	Institut National des Radioéléments (Belgium)
IREP	integrated reliability evaluation program	interim reliability evaluation program
IRFM	integral reactor flow model
IRG	Interagency Review Group
IRM	information resources management	Information Resources Management, Office of (NRC)	intermediate-range monitor
IRMP	Independent Radiation Monitoring Program
IRN	item removal notice
IRP	incident response plan	intermediate rotating plug
IRPA	International Radiation Protection Association (France)
IRPI	individual rod position indicator
IRR	Institute for Reactor Research (Switzerland)	Israeli Research Reactor
IRRAS	integrated reliability and risk analysis system
IRS	Incident Reporting System	Inquiry and Reporting System	Institut für Reaktorsicherheit der Technischen Überwachungs-Vereine, e.V. (Germany)	iodine removal system
IRSF	interim radwaste storage facility
IRSP	inside recirculation spray pump
IRSR	Issue Resolution Status Report
IRTS	inspection report tracking system
IRVH	integrated reactor vessel head
IRWST	in-containment refueling water storage tank
IS	indicating switch	information system
ISA	independent safety analysis	independent safety assessment or analysis	Instrument Society of America	integrated safety assessment
ISAF	isotopic source adjustable fissometer
ISAM	indexed sequential access method
ISAP	integrated safety assessment program
ISAS	isotopic source assay system
ISCA	Intersociety Committee on Methods for Ambient Air Sampling
ISCORS	Interagency Steering Committee on Radiation Standards
ISCP	intermediate sodium characterization package
ISCT	important-to-safety-criteria task	inner seal collar tool
ISD	instructional system design
ISDF	intermediate sodium disposal facility
ISDN	integrated services digital network
ISE	ion-selective electrode
ISEG	independent safety engineering group
ISER	integral systems experimental requirement
ISFSF	independent spent fuel storage facility
ISFSI	independent spent fuel storage installation
ISG	integrated scheduling group
ISGMP	integrated scheduling group manual procedure
ISGTR	induced steam generator tube rupture
ISI	inservice inspection
ISIS	integrated safeguards information system
ISITS	integrated safety issues tracking system
ISLH	inservice leak and hydrostatic
ISLOCA	interfacing-systems loss-of-coolant accident
ISMES	Istituto Sperimentale Modelli e Strutture (Italy)
ISNF	intermediate-energy standard neutron field
ISO	independent system operation	independent system operator	International Standardization Organization
ISO/DWG	isometric drawing
ISOO	Information Security Oversight Office
ISP	industrial security plan
ISR	intermediate sodium removal
ISSO	Information System Security Officer
IST	inservice test	inservice testing	integral simulation test	integral systems test
ISTS	Improved Standard Technical Specifications
ISV	in situ verification
IT	information technology	information theory	instrument test	instrument tree
I&T	inspection and test
ITAAC	inspection, test, analysis, and acceptance criterion/criteria
ITAL	Instituut voor Toepassing van Atoomenergie in de Landbouw (Netherlands)
IT&AP	inspection test and analysis plan
ITC	Information Technology Council	isothermal temperature coefficient
ITDP	improved thermal design procedure
ITF	interstitial transfer facility
ITFTRIA	instrument tree flow and temperature removal instrument assembly
ITI	inspection/test instruction	ion track instrument
ITIP	Industry Technical Information Program
ITL	Industrial Testing Laboratories
ITM	in-core temperature monitor	information technology management
ITMA	irradiation test management activity
ITMRA	Information Technology Management Reform Act
ITMS	in-core temperature monitoring system
ITPOP	independent, third-party oversight program
ITR	instrument test rig
ITRI	Industrial Technology Research Institute (Taiwan)
ITRIA	instrument tree removable instrument assembly
ITS	Idaho Test Station	important to safety	improved technical specification	Information Technology Services	inventory tracking system
IT/SP	instrument tree/spool piece
ITV	intermediate test vessel
IUPAC	International Union of Pure and Applied Chemistry
IUPAP	International Union of Pure and Applied Physics
IV	independent verification
IVHM	in-vessel handling machine
IVHM-EM	in-vessel handling machine–engineering model
IVHX	in-vessel heat exchanger
IVIC	Instituto Venezolano de Investigaciones Cientificas (Venezuela)
IVO	Imatran Voima Osakeyhtio (Finland)
IVP	integrated verification plan
IVS	in-vessel storage
IVSM	in-vessel storage module
IVTM	in-vessel transfer machine
IWF	industrial waste filter	industrial waste filtration
IWFS	industrial waste filter system	industrial waste filtration system
IWGFR	International Working Group on Fast Breeder Reactors
IWRC	iron wire rope core
IWS/IT	integrated work sequence/inspection traveler
IWTS	industrial waste treatment system
IX	ion exchanger
IZ	isolation zone
JABE	John A. Blume and Associates, Engineers
JAEC	Japan Atomic Energy Commission
JAEIP	Japan Atomic Energy Insurance Pool
JAERI	Japan Atomic Energy Research Institute
JAERO	Japan Atomic Energy Relations Organization
JAF	James A. FitzPatrick Nuclear Power Plant
JAFNPP	James A. FitzPatrick Nuclear Power Plant
JAIF	Japan Atomic Industrial Forum
JAJ	J.A. Jones Co.
JANAP	joint Army-Navy-Air Force publication
JAPC	Japan Atomic Power Co.
JARRP	Japan Association for Radiation Research on Polymers
JCAE	Joint Committee on Atomic Energy
JCCCNRS	Joint Coordinating Committee for Civilian Nuclear Reactor Safety
JCL	job control language
JCO	justification for continued operation
JCP	Joint Committee on Printing
JCPL	Jersey Central Power & Light Co.
JCP&L	Jersey Central Power & Light Co.
JEA	Jacksonville Electric Authority
JEEP	joint emergency evacuation plan	joint establishment experimental pile
JEN	Junta de Energía Nuclear (Spain)
JEPIC	Japan Electric Power Information Center
JET	joint European torus
JETR	Japan Engineering Test Reactor
JFNP	Joseph M. Farley Nuclear Plant
JFNPP	James A. FitzPatrick Nuclear Power Plant
JGC	Japan Gasoline Co., Ltd.
JGCR	Japan Gas-Cooled Reactor
JHEP	joint human error probability
JINR	Joint Institute for Nuclear Research
JIO	justification for interim operation
JOFOC	justification for other than full and open competition
JOG	Joint Owners Group
JPDR	Japan Power Demonstration Reactor
JPM	job performance measure
JRR	Japanese Research Reactor
JSW	Japan Steel Works, Ltd.
JTA	job task analysis/analyses
JTG	Joint Test Group
JUMA	Joint Utility Management Assessment Group
JURIS	justice retrieval and inquiry system
K/A	knowledge and abilities
KAEA	Kazakh Atomic Energy Agency
KAERI	Korea Atomic Energy Research Institute
KAIF	Korea Atomic Industrial Forum
KALC	krypton absorption in liquid carbon dioxide
KANUPP	Karachi Nuclear Power Plant (Pakistan)
KAPL	Knolls Atomic Power Laboratory
KBG	Kernkraftwerk-Betriebsgesellschaft, m.b.H. (Germany)
KBWP	Kernkraftwerk Baden-Wuerttemberg Planungsgesellschaft (Germany)
KE	Kaiser Engineers
KEEPS	Kodak Ektaprint Electronic Publishing System
Keff	effective multiplication factor
KEMA	Tot Keuring van Elektrotechnische Materialen, N.V. (Netherlands)
KERMA	kinetic energy released in material
KEWA	Kernbrennstoff-Wiederaufarbeitungs-Gesellschaft, m.b.H. (Germany)
KEWB	kinetic experiment on water boilers
KFKI	Központi Fizakai Kutató Intézet (Hungary)
KGBS	krypton gas bottling station
KG&E	Kansas Gas & Electric
KKB	Kernkraftwerk Brunsbuettel, G.m.b.H. (Germany)
KKK	Kernkraftwerk Krummel, G.m.b.H. (Germany)
KKL	Kernkraftwerk Leibstadt, A.G. (Switzerland)
KKN	Kernkraftwerk Niederaichbach, G.m.b.H. (Germany)
KKP	Kernkraftwerk Phillipsburg, G.m.b.H. (Germany)
KMC	Kerr McGee Corp.
KNFDI	Korea Nuclear Fuel Development Institute
KNPP	Kewaunee Nuclear Power Plant
KNPS	Kuosheng Nuclear Power Station (Taiwan)
KNU	Korean Nuclear Unit
KPDS	key plant damage state
KRB	Kernkraftwerk Gundremmingen Betriebsgesellschaft (Germany)	Kernkraftwerk RWE-Bayernwerk, G.m.b.H. (Germany)
KRR	Kansai Research Reactor (Japan)
KSAs	knowledge, skills, and abilities
KSB	Klein, Schanzlin and Becker Aktiengesellschaft (Germany)
KSF	Karen Silkwood Fund
KSGE	Kansas Gas & Electric Co.
KSH	Kernenergie-Gesellschaft Schleswig-Holstein, m.b.H. (Germany)
KSTR	Kema Suspension Test Reactor (Netherlands)
KTG	Kerntechnische Gesellschaft im Deutschen Atomforum, e.V. (Germany)
KTI	key technical issue
KTS	Kerntechnische Sektion der Schweizerischen Vereinigung für Atomenergie (Switzerland)
KTU	key technical uncertainty
KWG	Kernkraftwerk Graben, A.G. (Switzerland)
KWL	Kernkraftwerk Lingen, G.m.b.H. (Germany)
KWO	Kernkraftwerk Obrigheim, G.m.b.H. (Germany)
KWS	Kernkraftwerk Sud, G.m.b.H. (Germany)
KWU	Kraftwerk Union Aktiengesellschaft (Germany)
LA	licensing assistant	local alarm
LACBWR	LaCrosse Boiling Water Reactor
LACE	LWR (light-water reactor) aerosol containment experiment
LAFM	Los Alamos Fuel Model
LALL	low-activity level liquid [system]
LAMPRE	Los Alamos Molten Plutonium Reactor Experiment
LAN	local area network
LAND	League Against Nuclear Dangers
LANL	Los Alamos National Laboratory (formerly Los Alamos Scientific Laboratory)
LAPL	Louisiana Power & Light Co.
LAPPES	large power plant effluent study
LAPRE	Los Alamos Power Reactor Experiment
LAR	license amendment request	licensing action report	limited analytical review	local automatic regulation
LASL	Los Alamos Scientific Laboratory (now LANL)
LAW	low-acid waste
LAWB	Los Alamos Water Boiler
LBB	leak before break
LBE	licensing-basis event
LBL	Lawrence Berkeley Laboratory
LBLOCA	large-break loss-of-coolant accident
LBP	land-based plant	lumped burnable poison
LBPR	lumped burnable poison rod
LBRB	leak before risk of break
LC	level controller	local control	locked closed
LCCC	large-component cleaning cell
LCCV	large-component cleaning vessel
LCHS	large-component handling system
LCL	lower control limit
LCM	LOCA (loss-of-coolant accident) core melt
LCO	limiting condition for operation
LCR	large component removal	log count rate
LCRE	lithium-cooled reactor experiment
LCRM	linear count rate meter
LCS	leakage collection system	leakage control system	level control system	loop control system
LCTI	large-component test installation
LCTL	large-component test loop
LCV	level control valve	local control valve
LCVIP	licensee contractor vendor inspection program
LD	letdown	lethal dose
L/D	length to diameter
LDCC	large-diameter component cask
LDR	load definition report	low dose rate
L/DRS	level and density recorder switch
LDS	leak detection system
LDST	letdown storage tank
LE	left end	limit of error
LEAC	levelized energy adjustment clause
LED	light-emitting diode
LEFM	linear elastic fracture mechanics
LEID	limit of error on inventory difference
LEL	large engineering loop	lower electrical limit
LEMUF	limit of error on material unaccounted for
LEO	lasers and electro-optics
LEP	local emergency protection
LER	licensee event report
LERF	large early release frequency
LERO	local emergency response organization
LERP	large early release probability
LES	limited early site	Louisiana Energy Services
LESR	limited early site review
LET	linear energy transfer
LEU	license to export uranium	low-enriched uranium
LFA	lead Federal agency
LFBR	liquid fluidized bed reactor
LFBR-CX	liquid fluidized bed reactor–critical experiment
LFDCP	local fire detection control panel
LFL	lower flammability limit
LFMS	license fee management staff
LGR	light-water-cooled, graphite-moderated reactor
LGS	Limerick Generating Station	lower group stop
LH	low head
LHC	Little Harbor Consultants, Inc.
LHGR	linear heat generation rate
LHM	loop-handling machine
LHR	linear heat rate
LHS	Latin Hypercube Sampling	loop-handling system
LHSI	low-head safety injection
LHST	laundry and hot shower tank
LI	level indicator
LIC	level indicating controller	level indicator controller	loop insertion cell
LIFO	last in, first out
LILCO	Long Island Lighting Co.
LIM	ligament instability model	lower inlet module
LIMB	liquid metal breeder
LIMSW	limit switch
LIM	SWlimit switch
LINAC	linear accelerator
LIONS	Licensing and Inspection Online System
LIRS	level indicator recording switch
LITR	low-intensity test reactor
LIWB	Livermore Water Boiler
LL	liquid limit
LLCS	low-level compaction station
LLD	low-level dose	lower limit of detection
LLEA	local law enforcement agency
LLFM	low-level flux monitor
LLLWT	low-level liquid waste tank
LLMPP	liquid level monitor port plug
LLNL	Lawrence Livermore National Laboratory
LLRT	local leak-rate test
LLRW	low-level radioactive waste
LLRWPAA	Low-Level Radioactive Waste Policy Amendments Act
LLS	low-level solid	low-low set
LLSV	low-level storage vault
LLSWV	low-level solid-waste storage vault
LLT	liquid level transducer
LLTR	large-leak test rig
LLW	low-level radioactive waste	low-level waste
LLWBG	low-level-waste burial ground
LLWSV	low-level-waste storage vault
LM	labor management	local manual
LMEC	Liquid Metal Engineering Center
LMFBR	liquid metal fast breeder reactor
LMFR	liquid metal fuel reactor
LMFRE	liquid metal fuel reactor experiment
LMHX	liquid metal heat exchanger
LMP	licensing milestone plan
LMR	liquid metal reactor
LMS	licensing management system
LMTD	logarithmic mean temperature difference
LNG	liquefied natural gas	liquid natural gas
LNGS	LaCrosse Nuclear Generating Station
LNS	liquid nitrogen system	London Nuclear Services
LNT	linear, no-threshold
LNW	loss of normal water
LN2	liquid nitrogen
LO	lock open	locked open	lube oil
LOA	letter of agreement	line of assurance
LOBI	loop blowdown investigation
LOCA	loss-of-coolant accident
LOCE	loss-of-coolant experiment
LOCF	loss of coolant flow
LOCP	loss-of-coolant protection
LOCV	loss of condenser vacuum
LOF	lack of fusion	loss of feedwater	loss of flow
LOFA	loss-of-feedwater accident	loss-of-flow accident
LOFC	loss of forced circulation	loss of forced cooling
LOFT	loss-of-fluid test
LOFW	loss of feedwater
LOFWS	loss of flow without scram
LOHS	loss of heat sink
LOHSWS	loss of heat sink without scram
LOI	loss of ignition
LOMF	loss of main feedwater
LOMFW	loss of main feedwater
LOOP	loss of offsite power
LOP	loss of offsite power	loss of power
LOPAR	low parasitic fuel
LOPI	loss of pipe integrity
LOPO	low power
LOPRA	low-power reactor assembly
LOPS	loss-of-power start
LOR	lower oil reservoir
LORD	licensing online retrieval data
LORDS	licensing online retrieval data system
LORT	licensed operator requalification training
LOSP	loss of offsite power	loss of station power	loss of system pressure
LOST	lube oil storage tank
LOU	letter of understanding	limited official use
LOVS	loss-of-voltage signal	loss-of-voltage start
LP	liquid penetrant	low pressure
LPC	loop preparation cask
LPCI	low-pressure coolant injection	low-pressure core injection
LPCIS	low-pressure coolant injection system
LPCS	low-pressure core spray
LPD	linear power density	local power density
LPDR	local public document room
LPE	loop preparation equipment
LPG	liquefied petroleum gas	liquid petroleum gas	low-pressure gas
LPGS	Liquid Pathway Generic Study
LPHSW	last pass heat sink welding
LPI	low-power injection	low-pressure injection
LPIS	low-pressure injection system
LP&L	Louisiana Power & Light Co.
LPLNG	low-pressure liquefied natural gas
LPM	licensing project manager
LPMA	loose-parts-monitor assembly
LPMS	loose-parts monitoring system
LPNGP	low-pressure noble gas processing
LPOL	low-power operating license
LPR	Lynchburg Pool Reactor
LPRM	local power range monitor	low-power range monitor
LPRS	low-pressure recirculation system
LPSI	low-pressure safety injection
LPSIP	low-pressure safety injection pump
LPSP	low-power set point
LPSW	low-pressure service water
LPT	liquid penetrant testing	low-pressure turbine
LPTF	low-power test facility
LPTR	Livermore Pool Type Reactor
LPZ	low-population zone
LR	level regulator	load reject	load rejection
LRA	locked-rotor accident
LRB	licensing review basis/bases
LRC	level recorder controller	Lewis Research Center	local recovery center
LRED	licensing reportable event determination
LRG	license review group	licensing review group
LRIA	level removable instrument assembly
LRL	Lawrence Radiation Laboratory
LRM	lead reactor manufacturer	logarithmic radiation monitor
LRP	large rotating plug
LRPE	licensee regulatory performance evaluation
LRRP	long-range research plan
LRS	level recording switch	liquid radwaste system
LRTS	liquid radwaste treatment system
LRVOS	liner recombiner and vacuum outgassing system
LRW	liquid radioactive waste
LRX	large reactor critical experiment
LS	level switch	lighting system	locked shut
LSA	low specific activity
LSB	last-stage blade
LSCS	LaSalle County Station
LSDF	large sodium disposal facility
LSDP	Lake Superior District Power Co.
LSFT	logic system functional test or testing
LSI	licensed supervising instructor
LSNM	low strategic significance special nuclear material
LSP	level set point	lower sequential permissive
LSR	Lynchburg Source Reactor
LSRO	limited senior reactor operator
LSS	Licensing Support System
LSSA	Licensing Support System Administrator, Office of (NRC)
LSSARP	Licensing Support System Advisory Review Panel
LSSC	less safety-significant component
LSSP	latest scram set point
LSSS	limiting safety system set point	limiting safety system setting
LSTF	large-scale test facility
LT	leak testing	level transmitter
LTA	lead test assembly	less than adequate	low-temperature adsorber
LTBT	Limited Test Ban Treaty
LTC	linear translation case	load tap changer
LTD	letdown
LTL	lot truck load
LTM	long-term maintenance	low-trajectory missile
LTMD	less than minimum detectable
LTNGP	low-temperature noble gas process
LTOP	low-temperature overpressure protection
LTP	long-term program
LTR	lattice test reactor	licensing technical review	Lockheed Training Reactor
LTS	License Tracking System	Licensing Tracking System
LTSF	lid tank shielding facility
LTSP	long-term seismic program
LTV	large test vessel
LUWAS	lowest unit with age significance
LUXATOM	Syndicat Luxembourgeois pour l’Industrie Nucléaire (Luxembourg)
LV	leaky valve
LVDT	linear variable differential transducer	linear variable differential transformer	linear variable displacement transducer	linear voltage differential transformer
LWA	limited work authorization
LWBR	light-water breeder reactor
LWCHW	light-water-cooled, heavy-water-moderated reactor
LWGR	light-water-cooled graphite-moderated reactor
LWMS	liquid waste management system
LWOP	leave without pay
LWP	liquid waste processing
LWPS	liquid waste processing system
LWR	light-water reactor
LWTS	laundry waste treatment system
M/A	manual or automatic
MAA	material access area
MAAC	Mid-Atlantic Area Council
MAAP	material access authorization program	modular accident analysis program
MAC	maintenance action card	management advisory committee	Management Analysis Co.	material accounting	maximum allowable concentration
MACCT	multiple assembly cooling cask test
MAD	maintenance assembly-disassembly
MAELU	Mutual Atomic Energy Liability Underwriters
MAG	magnetics
MAI	miscellaneous actuation instrumentation
MAIN	Mid-American Interpool Network
MAIT	matrix analysis of insider threat
MAM	management and administration manual
MAN	Maschinenfabrik Augsberg-Nürnberg, A.G. (Germany)
MAP	maintenance action plan	maintenance assessment package	methodology assessment program
MAPI	Mitsubishi Atomic Power Industries, Inc. (Japan)
MAPLHGR	maximum average planar linear heat-generation rate	maximum average planar linear heat-generation ratio
MAR	maintenance action request
MARAD	Maritime Administration
MARCA	Mid-Continent Area Reliability Coordination Agreement
MARCH	meltdown accident response characteristic
MASE	microwave amplification by stimulated emission
MAT	management advisory team
MB	mixed bed
MB-2	Model Boiler-Two
MBA	material balance area
MBO	management by objective
MBP	monobutyl phosphate
Mbq	megabecquerel
MBR	material balance report
MC	main circulator	main condenser	major component	manual chapter (NRC)	metal clad	Mitsubishi Corporation
MCA	material control and accountability	maximum credible accident	multichannel analyzer
MC&A	material control and accounting
MCAP	Management Corrective Action Plan
MCB	main control board
MCC	Materials Characterization Center	motor control center	movement control center
MCCB	molded-case circuit breaker
MCES	main condenser evacuation system
MCET	materials, chemical, and environmental technology
MCHFR	minimum critical heat flux rate	minimum critical heat flux ratio
MCI	managed cost improvement	millicurie
MCIG	miscellaneous control and instrumentation group
MCIS	materials compatibility in sodium
MCLAMS	measurement, control, LEID (limit of error of the inventory difference) and MUF (material unaccounted for) ID (inventory difference) simulation
MCOV	maximum continuous operating voltage
MCPR	maximum critical power ratio	minimum critical power ratio
MCR	main control room	material certification report
MCREC	main control room environmental control
MCRH	main control room habitability
MCRHS	main control room habitability system
MCS	main circulator subsystem	master control station	Monte Carlo Sampling
MCSS	metallic core support structure
MCV	movable closure valve
MD	management directive	measured discard
MDA	minimum detectable activity
MDAFWP	motor-driven auxiliary feedwater pump
MDB	master database
MDC	maximum dependable capacity	minimum detectable concentration	moderator density coefficient
MDCT	mechanical draft cooling tower
MDEFWP	motor-driven emergency feedwater pump
MDEP	Maine Department of Environmental Protection
MDF	mechanical design flow
MDHR	mini-decay heat removal
MDI	Many Diverse Interests, Inc.
MDL	minimum detectable limit
MDM	metal disintegration machining	modified diffusion method
MDNBR	minimum departure from nucleate boiling ratio
MDP	master decommissioning plan
MDR	manufacturer’s date report
MDS	megawatt demand setter
MDU	motion detection unit
ME	maintenance effectiveness
M&E	material and equipment
MEA	maintenance engineering analysis	Materials Engineering Associates
MEAG	Metropolitan Electric Authority of Georgia
MEC	Mid American Energy Co.
MECAS	multienergy californium assay system
MEED	Metropolitan Edison Co.
MEHC	Mid American Energy Holdings Co.
MEF	median energy of fission
MEFV	maintenance equipment floor valve
MEGAS	multienergy gamma assay system
MEI	maintenance effectiveness indicator	maximally exposed individual
MEIS	minimum electrical isolation scheme
MEL	master equipment list	Mitsubishi Electric Corp. (Japan)
MELB	moderate-energy line break
MELC	moderate-energy line crack
MEOD	maximum extended operating domain
MEPNS	Ministry of Environmental Protection and Nuclear Safety (Ukraine)
MEQ	mechanical equipment qualification
MERIT	management evaluation and risk identification tree
MERITS	methodically engineered, restructured, and improved technical specifications
MERLIN	Medium-Energy, Light-Water-Moderated, Industrial Nuclear Reactor (United Kingdom)
MES	maintenance engineering services
MESA	multielement skew angle
MESF	minimum engineered safety feature
MESL	maximum emergency service load
METAFRAM	Métallurgie Française des Poudres, S.A. (France)
MEU	medium-enriched uranium
MeV	million electron volts
MEWS	Mixed Energy Waste Study
MF	mound facility
MFB	main feeder bus
MFC	master flow controller
MFCI	molten fuel coolant interaction
MFCS	main feedwater control system
MFI	minimum flow interlock
MFIS	main feedwater isolation signal
MFIV	main feedwater isolation valve
MFL	main feedwater line	master fuse list	maximum foreseeable loss
MFLPD	maximum fraction of limiting power density
MFP	main feed power	main feedwater pump	mixed fission product
MFPG	mixed fission products generator
MFPT	main feedwater pump turbine
MFPTC	main feed pump turbine condenser
MFRV	main feedwater regulation valve
MFS	main feedwater system	mobilization for survival
MFT	multiprogramming with a fixed number of tasks
MFTA	multiduct fuel test assembly
MFV	main feedwater valve	maintenance floor valve
MFW	main feedwater
MFWCS	main feedwater and condensate system
MFWLB	main feedwater line break
MFWRV	main feedwater regulating valve
MFWV	main feedwater valve
MG	manual group	motor generator
M/G	motor generator
M-G	motor generator
MGCR	maritime gas-cooled reactor
MGCR-CX	maritime gas-cooled reactor–critical experiment
MGDS	mined geologic disposal system
MGEC	Madison Gas & Electric Co.
MGVC	manual governing valve control
MHA	maximum hypothetical accident
MH-1A	Mobile High Power Plant No. 1A
MHC	mechanical-hydraulic control
MHD	magnetohydrodynamics
MHDC	magnetohydrodynamic conversion
MHFPR	maximum hypothetical fission-product release
MHI	Mitsubishi Heavy Industries, Ltd. (Japan)
MHNGS	Marble Hill Nuclear Generating Station
MHP	material handling procedure
MHTGR	modular high-temperature gas-cooled reactor
MHTS	main heat transport system
MI	manual individual	mineral insulated
MIBK	methyl isobutyl ketone
MIC	microbiologically induced corrosion	microbiologically influenced corrosion
MICDS	movable in-core detector system
MIDAS	meteorological information and dose acquisition system	meteorological information and dose assessment system
MIDS	movable instrument drive system
M&IE	meals and incidental expenses
MIL	material identification list	material identification log
MIMS	metal impact monitoring system
MINET	momentum integral network
MIP	maintenance improvement program	master inspection plan
MIPS	master inspection planning system
MIS	maintenance information system	management information system
MIST	maximum isothermal system temperature	minor isotopes safeguards technique	multiloop integral system test
MIT	Massachusetts Institute of Technology
MITI	Ministry of International Trade and Industry (Japan)
MITR	Massachusetts Institute of Technology Reactor
MKU	Mary Kathleen Uranium, Ltd. (Australia)
ML	manufacturing license
ML-1	Mobile Low Power Plant No. 1
MLD	mean low-water datum/data	median lethal dose
MLHGR	maximum linear heat generation rate	maximum linear heat generation ratio
MLO	main lube oil
MLP	main loop pump
MLS	Medilab Select (Belgium)	multi-level secure
MLSR	Monthly Letter Status Report
MLSV	main loop shutoff valve
MLW	mean low water
MLWMS	miscellaneous liquid waste management system
MM	mechanical maintenance	modified Mercalli
MME	Mercantile Marine Engineering and Graving Docks Co., N.V. (Belgium)
MMG	motor-motor generator
MMI	man-machine interface	modified Mercalli intensity
MMP	maintenance manual procedure
MMPA	Magnetic Material Producers Association
MMSA	man-machine systems analysis/analyses
MMWEC	Massachusetts Municipal Wholesale Electric Co.
MNCR	material nonconformance report
MNGP	Monticello Nuclear Generating Plant
MNP	maximum negative pressure
MNPS	Millstone Nuclear Power Station
MNS	McGuire Nuclear Station
M&O	management and organizational
MO	mixed oxide	modulate open	motor operator
MOA	memorandum/memoranda of agreement
MOC	middle of cycle	minimum operable channel
MOD	motor-operated disconnect
MODE	maximum organ dose equivalent
MODEM	modulator-demodulator
MONAL	mobile nondestructive assay laboratory
MOOS	maintenance out of service
MOP	maintenance outline procedure
MOR	monthly operating report
MORT	management oversight risk tree
MOTA	materials open test assembly
MOU	memorandum/memoranda of understanding
MOV	metal oxide varister	motor-operated valve
MOVATS	motor-operated valve analysis and test system
MOX	mixed oxide
MOXF	mixed-oxide fuel
MP	magnetic particle	maintenance procedure	Midland Plant
MPA	multiplant action	multiplant activity
MPAI	maximum permissible annual intake
MPBB	maximum permissible body burden
MPC	maximum permissible concentration	Metals Properties Council	Montana Power Co.	multi-purpose canister
MPCA	maximum permissible concentration in air
MPCW	maximum permissible concentration in water
MPD	maximum permissible dose
MPE	maximum permissible exposure
MPFF	maintenance preventable functional failure
MPL	master parts list	maximum permissible level	mechanical properties loop
MP&L	Mississippi Power & Light Co.
MPO	manufacturing production order
MPP	maximum positive pressure
M&PP	materials and plant protection
MPR	mechanical pressure regulator
MPRE	medium-power reactor experiment
MPRT	multipurpose rail transport
MPS	manpower system
mps	meter per second
MPS	monitoring and protection system	multipurpose sampler
MPSC	Maine Public Service Co.
MPT	magnetic particle testing	minimum pressurization temperature
MPX	multiplexer
MQE	materials and qualifications engineering	mechanical quality engineering
MQS	motion to quash subpoena
MR	material requisition	monitoring report
MRB	Management Review Board
MRBI	maintenance rule baseline inspection
MRBT	multirod burst test
MRC	Medical Research Council (United Kingdom)
MREM	millirem
MRI	material receiving instruction
MRMU	mobile radiological measuring unit
MRO	medical review officer
MRP	modification/rework package
MRPC	motorized rotating pancake coil
MRR	material receiving report	medical research reactor
MRS	manipulator repair shop	manufacturer’s record sheet	monitored retrievable storage
MRSS	main and reheat steam system
MS	main steam	manual sequential	margin of safety	milestone
M/S	maintenance/surveillance
MSA	management self-assessment	material surveillance assembly	mechanical signature analysis/analyses	mines safety appliance
MSAR	mines safety appliance research
MSB	main steamline break	multi-assembly sealed basket
MSBE	molten salt breeder experiment
MSBR	molten salt breeder reactor
MSCA	mixed spectrum critical assembly
MSCI	molten steel coolant interaction
MSG	modular steam generator
MSGTR	multiple steam generator tube rupture
MSHA	Mine Safety and Health Administration
MSICV	main steam isolation check valve
MSIP	modified stabilization in place
MSIS	main steam isolation signal
MSIV	main steam isolation valve
MSIVLCS	main steamline isolation valve leakage control system
MSL	main steamline	maximum still-water level	mean sea level
MSLA	main steamline accident
MSLB	main steamline break
MSLD	mass spectrometer leak detector
MSLI	main steamline isolation
MSLIVSS	main steamline isolation valve sealing system
MSLRDS	main steamline rupture detection system
MSM	master/slave manipulator	modified source multiplication
MSNM	special nuclear material of moderate strategic significance
MSPB	Merit System Protection Board
MSR	material status report	maximum steam rate	moisture separator reheater	molten salt reactor
MSRE	molten salt reactor experiment
MSRP	Multiple System Responses Program
MSRV	main steam relief valve
MSS	main steam system	main support structure	management systems section	Manufacturers Standardization Society of the Valve and Fittings Industry	mixed spectrum superheater	modified scram system
MSSC	more safety-significant component
MSSCE	mixed spectrum superheater critical experiment
MSSR	mixed spectrum superheat reactor	main steam safety relief (valve)
MSSS	main steam supply system	main steam support structure
MSSV	main steam safety valve	main steam shutoff valve
MSV	mean square voltage
MS&W	maintenance shop and warehouse
MT	magnetic particle test	magnetic particle testing	material transfer	materials test	melt through
MTBF	mean time between failures
MTC	moderator temperature coefficient	multi-assembly transfer cask
M&TE	measuring and test equipment
MTER	multitest evaluation report
MTF	mean time to failure
MTG	main turbine generator
MT/G	main turbine generator
MTI	maintenance team inspection	mandatory team inspection	Mechanical Technology, Inc.
MTL	materials test loop	Mobiltherm light
MTOS	magnetic tape operations system
MTPF	maximum total peaking factor
MTR	materials testing reactor
MTS	module tracking system
MTT	microwave theory and techniques
MTTF	mean time to failure
MTTR	mean time to repair	mean time to replacement
MTU	metric ton of uranium	metric ton unit	module test unit
MU	makeup
MUF	material unaccounted for
MUG	MOV Users Group
MU&P	makeup and purification
MUR	management update and retrieval	mockup reactor
MUSE	Musicians United for Safe Energy
MUT	makeup tank
MUTN	MOVATS Users Technical Notice
MUX	multiplexer
MVP	mechanical vacuum pump
MVS	multiple virtual storage
MVT	multiprogramming with a variable number of tasks
MW	megawatt
MWDC	multiple weld data card
Mwe	megawatt electric
MWHT	miscellaneous waste holdup tank
MWO	maintenance work order
MWS	makeup water system
MWST	makeup water storage tank	miscellaneous waste storage tank
Mwt	megawatt thermal
MW-yr	megawatt-year
MYAP	Maine Yankee Atomic Power Co.
MYAPS	Maine Yankee Atomic Power Station
MZFR	Mehrzweck Forschungsreaktor (Germany)
NA	not applicable	not available
N/A	not applicable
NAA	neutron activation analysis/analyses
NAB	nuclear assembly building
NAC	national agency check	Nuclear Assurance Corporation
NACE	National Association of Corrosion Engineers
NAD	nuclear accident dosimetry
NAEC	North Anna Environmental Coalition
NAESCO	North Atlantic Energy Service Corp.
NAFTA	North American Free Trade Agreement
NAGRA	Nationale Genossenschaft für die Lagerung Radioaktiver Abfälle (Switzerland)
NAI	sodium iodide
NAIG	Nippon Atomic Industry Group Co., Ltd. (Japan)
NAN	Nuclear Awareness Network
NANT	National Academy for Nuclear Training
NAPA	National Academy of Public Administration
NAPCA	National Air Pollution Control Administration
NAPS	North Anna Power Station
NAPSIC	North American Power Systems Interconnection Committee
NAPUS	nuclear auxiliary power unit system
NARA	National Archives and Records Administration
NARADCom	Natick Research and Development Command
NARM	naturally occurring or accelerator-produced radioactive material
NARUC	National Association of Regulatory Utility Commissioners
NAS	National Academy of Sciences	nonreactor assessment staff
NASA	National Aeronautics and Space Administration
NASAP	Nonproliferation Alternative Systems Assessment Program
NAS-NRC	National Academy of Sciences–National Research Council
NASE	National Academies of Science
NASUCA	National Association of State Utility Consumer Advocates
NAWAS	national warning system
NB	nuclear blank	nuclear boiler
NBGEL	New Bedford Gas and Edison Light Co.
NBL	New Brunswick Laboratory
NBP	New Brunswick Power (Canada)
NBR	nuclear boiler rated
NBS	National Bureau of Standards (now National Institute of Standards and Technology)
NBSR	National Bureau of Standards Reactor
NC	neutron controller	normally closed	nuclear construction
NCA	neutron control assembly
NCAI	National Congress of American Indians
NCBR	near-commercial breeder reactor
NCF	no containment failure
NCIG	Nuclear Construction Issues Group (EPRI)
NCP	network control program
NCR	nonconformance report	nonconforming condition report	notification-of-change report
NCRERP	North Carolina Radiation Emergency Response Plan
NCRP	National Council on Radiation Protection
NCRP(M)	National Committee on Radiation Protection and Measurements
NCRWS	National Campaign for Radioactive Waste Safety
NCS	national communications system	nuclear criticality safety
NCSA	National Center for Supercomputing Applications
NCSAG	Nuclear Cross Section Advisory Group
NCSCR	North Carolina State College Reactor
NCSL	National Conference of State Legislatures
NCSS	neutron control subsystem
NCSUR	North Carolina State University Reactor
NCV	non-cited violation
NCVP	natural circulation verification program
ND	negative declaration	normally deenergized
NDA	no detectable activity	nondestructive analysis	nondestructive assay
NDC	nuclear data committee
NDCT	natural draft cooling tower
NDE	nondestructive examination
NDHX	natural draft heat exchanger
NDL	nuclear data link
NDRC	National Defense Research Council
NDT	nil ductility temperature	nil ductility transition	nondestructive testing
NDTT	nil ductility transition temperature
NE	normally energized	nuclear engineering
NEA	Northeast Energy Alliance	Nuclear Energy Agency (OECD)	Nuclear Engineering Associates
NEB	Nuclear Energy Board (Ireland)
NEC	National Electrical Code	Nuclear Energy Center
NECAP	Nutmeg Electric Companies Atomic Project
NECNP	New England Coaliltion on Nuclear Pollution
NECO	Nuclear Engineering Company
NECSS	Nuclear Energy Center Site Survey
NEDS	nuclear employee data system
NEES	New England Electric System
NEGEA	New England Gas and Electric Association
NEI	Nuclear Energy Institute (formerly NUMARC and USCEA)
NEIL	Nuclear Electric Insurance Limited
NEJAC	National Environmental Justice Advisory Council
NELIA	Nuclear Energy Liability Insurance Association
NELPIA	Nuclear Energy Liability Property Insurance Association
NEMA	National Electrical Manufacturers Association
NENE	Northeast Nuclear Energy Co.
NEO	nuclear engineering and operations
NEP	New England Plant
NEPA	National Environmental Policy Act
NEPCO	New England Power Company
NEPIA	Nuclear Energy Property Insurance Association
NERA	National Economic Research Associates, Inc.
NERC	National Electric Reliability Council	National Environment Resource Council (United Kingdom)	Nuclear Energy Research Centre (Belgium)
NERHL	Northeastern Radiological Health Laboratory
NERP	nuclear experience review program
NERV	nuclear emulsion recovery vehicle
NERVA	nuclear engine for rocket vehicle application
NESC	National Electric Safety Code	Nuclear Energy Software Center
NESCWS	nonessential services chilled water system
NESDIP	Nestor Shielding and Dosimetry Improvement Program
NESF	normal engineered safety feature
NESP	National Environmental Studies Project
NEST	nuclear emergency search team
NETR	Nuclear Engineering Test Reactor
NEU	Northeastern Utilities (Company)
NEUSSN	Northeastern U.S. Seismic Network
NEUT	Northeast Utilities
NEVP	Nevada Power Co.
NEW	Nuclear Energy Women
NEWS	Nuclear Engineering Workstation Simulator
NEWSTAR	nuclear energy waste space transportation and removal
NF	neutron flux
NFC	no further consequences
NFCA	nonfuel core array
NFI	Nuclear Fuel Industries, Ltd. (Japan)
NFPA	National Fire Protection Association
NFRRC	nuclear fuel recovery and receiving center
NFS	network file system	Nuclear Fuel Services Co.
NFSA	new fuel storage area
NG	nitroglycerin	noble gas
NGA	Nationale Gesellschaft für Förderung der Industriellen Atomtechnik (Switzerland)
NGE	North Georgia Electric Membership Corp.
NGF	Natural Guard Fund
NGN	Next Generation Network
NGSF	noble gas storage facility
NHPA	National Historic Preservation Act
NHY	New Hampshire Yankee
NI	never incorporated	nuclear instrument	nuclear instrumentation	nuclear island
NIAC	Nuclear Industry Assessment Committee	Nuclear Insurance Association of Canada
NIC	Nuclear Industry Check Valve Group	Nuclear Industry Consortium (Belgium)
NICWB	nuclear island cooling water building
NIDA	National Institute on Drug Abuse
NIH	National Institutes of Health (U.S. Public Health Service)
NII	Nuclear Installations Inspectorate (United Kingdom)
NIM	nuclear instrument module
NiMo	Niagara Mohawk Power Corp.
NIOBE	numerical integration of the Boltzmann equation
NIOSH	National Institute for Occupational Safety and Health (U.S. Public Health Service)
NIPA	notice of initiation of procurement action
NIPS	Northern Indiana Public Service Co.
NIRA	Nucleare Italiana Reattori Avanzati, SpA (Italy)
NIRB	Nuclear Insurance Rating Bureau
NIRL	negligible individual risk level
NIRMA	Nuclear Information and Records Management Association, Inc.
NIRNS	National Institute for Research in Nuclear Science (United Kingdom)
NIRS	National Institute of Radiological Sciences (Japan)	Nuclear Information and Resource Service
NIS	Network Information Service	Nevada Inspection Service	Newly Independent States	nuclear instrumentation system
NISCO	Nuclear Inspection Services Company
NISP	National Industrial Security Program
NISPOM	National Industrial Security Program Operating Manual
NIST	National Institute of Standards and Technology (formerly National Bureau of Standards)
NJBPU	New Jersey Board of Public Utilities
NJOAL	New Jersey Office of Administrative Law
NLI	National Lead Industries	Nuclear Industries, Inc.
NMA	National Mining Association
NMAC	Nuclear Maintenance Assistance Center (Electric Power Research Institute)
NMCC	Nuclear Material Control Center (Japan)
NMDB	nuclear maintenance database
NMEC	Northern Michigan Electric Cooperative, Inc.
NMED	nuclear material events database
NMIS	nuclear materials information system	nuclear materials inventory system
NMMSS	nuclear materials management and safeguards system
NMP	national meter programming	Niagara Mohawk Power Corp.
NMPNS	Nine Mile Point Nuclear Station
NMRG	Nuclear Managers Review Group
NMS	national measurement system	neutron monitoring system
NMSS	Nuclear Material Safety and Safeguards, Office of (NRC)
NMST	new materials system test
NMT	nuclear medicine technologist
NN	nearest neighbor	nearest neighboring
NNC	National Nuclear Corporation, Ltd. (United Kingdom)
NNCSC	National Neutron Cross Section Committee
NNDC	National Nuclear Data Center
NNEC	National Nuclear Energy Commission (Brazil)
NNECO	Northeast Nuclear Energy Co.
NNESCO	Northeast Nuclear Energy Services Co.
NNI	nonnuclear instrumentation
NNIS	nonnuclear instrumentation system
NNPA	Nuclear Non-Proliferation Act of 1978
NNPS	Norco Nuclear Power Station
NNS	nonnuclear safety
NNSA	National Nuclear Safety Administration (China)
NNSDD	Newport News Shipbuilding and Dry Dock Company
NNTP	network news transfer protocol
NNWSI	Nevada Nuclear Waste Storage Investigation
NO	normally open
NOAA	National Oceanic and Atmospheric Administration
NOAC	Nuclear Operations Analysis Center
NOD	notice of deviation
NOED	notice of enforcement discretion
NOI	notice of indication
NOL	Naval Ordnance Laboratory	normal operating loss
NON	notice of nonconformance
NOP	normal operating procedure
NORCUS	Northwest College and University Association for Science
NORM	naturally occurring radioactive material
NOS	not otherwise specified
NOUE	notice of unusual event	notification of unusual event
NOV	notice of violation
NOWUS	normal operation with unscram
NP	negative pressure	nuclear power
NPA	nuclear plant analyzer
NPAR	nuclear plant aging research
NPC	Nuclear Power Co.
NPCA	National Paint and Color Association
NPCC	Northeast Power Coordinating Council
NPD	national policy debate	Nuclear Power Demonstration (Canada)
NPDB	nuclear plant data bank
NPDES	National Pollutant Discharge Elimination System
NPE	nuclear plant engineering	nuclear power experience
NPEC	Nuclear Power Engineering Committee
NPEP	Nuclear Plant Equipment Procurement Working Group
NPF	nuclear power facility
NPG	Nuclear Power Group, The (United Kingdom)
NPGS	nuclear power generating station
NPIS	nuclear plant island structure
NPO	nuclear plant operator
NPP	nuclear performance plan	nuclear power plant
NPPD	Nebraska Public Power District
NPR	National Performance Review	new production reactor	nonpower reactor
NPRCG	Nuclear Public Relations Contact Group (Italy)
NPRDS	Nuclear Plant Reliability Data System (INPO)
NPRF	Northrop Pulse Radiation Facility
NPS	nominal pipe size	normal pressurizer spray	Nuclear Power Service (Westinghouse)	numerical plotting system
NPSH	net positive suction head
NPSI	Nuclear Power Service Incorporated
NPSRA	Nuclear-Powered Ship Research Association (Japan)
NPSRS	nuclear power safety reporting system
NPT	national pipe thread	Nonproliferation Treaty
NPTF	nuclear proof test facility
NPZ	nickel-plated Zircaloy 4
NQAA	Nuclear Quality Assurance Agency
NQAM	nuclear quality assurance manual
NQAP	nuclear quality assurance plan
NR	narrow resonance	nonconformance report
NRA	Nuclear Regulatory Administration	Nuclear Regulatory Authority (Ukraine)
NRAP	naturally radioactive product
NRB	nonconformance review board
NRC	National Research Council	Nuclear Regulatory Commission, U.S.
NRCAR	NRC Acquisition Regulation
NRCC	National Research Council (Canada)	Northern Rockies Cancer Center
NRDC	National Resources Defense Council
NRDS	Nuclear Rocket Development Station
NRE	nuclear research emulsion
NREP	National Reliability Evaluation Program	neutron resonance escape probability
NRHE	nonregenerative heat exchanger
NRHX	nonregenerative heat exchanger
NRIM	narrow resonance infinite mass
NRL	Naval Research Laboratory (United Kingdom)
NRPB	National Radiological Protection Board
NRR	Naval Research Reactor	Nuclear Reactor Regulation, Office of (NRC)
NRRO	nuclear radiation-resistant oil
NRT	national response team
NRTS	National Reactor Test Station
NRU	National Reactor Universal
NRW	nonradioactive waste
NRWV	nonradioactive waste vent
NRX	National Research Reactor	nuclear engine reactor experiment
NS	near side	normally shut	nuclear ship
NSA	National Security Agency	Nuclear Safety Agency	Nuclear Science Abstracts	Nuclear Systems Associates
NSAC	Nuclear Safety Analysis Center
NSC	National Security Council	net-section collapse	net-suction collapse	Nuclear Safety Concern
NSCR	Nuclear Science Center Reactor
NSCW	nuclear service cooling water
NSDM	national security decision memorandum/memoranda
NSEP	National Security Emergency Preparedness
NSF	National Sanitation Foundation	National Science Foundation	Nuclear Science Foundation
NSFP	nonsodium fire protection
NSHC	no-significant-hazards consideration
NSHE	no-significant-hazards evaluation
NSI	national security information
NSIAC	Nuclear Strategic Issues Advisory Committee (NEI)
NSIC	Nuclear Safety Information Center
NSIP	Nuclear Safe Issues Program
NSLD	No Seismic Limit Duration
NSMH	Nuclear Systems Material Handbook
NSO	nuclear station operator
NSOA	nuclear safety operational analysis/analyses
NSP	Northern States Power Co.
NSPP	nuclear safety pilot plant
NSPS	nuclear safety protection system
NSQAC	Nuclear Supplier Quality Assurance Committee
NSTC	National Science and Technology Center
NSR	neutron source reactor	non-safety-related
NSRA	Nuclear Safety Research Association (Japan)
NSRB	Nuclear Safety Review Board
NSRG	Nuclear Safety Review Group
NSRL	Nuclear Structure Research Laboratory
NSRR	nuclear safety research reactor
NSRRC	Nuclear Safety Research Review Committee
NSRS	nuclear safety review staff
NSS	nuclear steam system
NSSM	national security study memorandum/memoranda
NSSS	nuclear steam supply system	nuclear steam system supplier
NSSSS	nuclear steam supply shutoff system
NSTF	Nuclear Science and Technology Facility
NSUM	neutron shuffler uranium monitor
NSW	nuclear service water
NSWMA	National Solid Waste Management Association
NSWS	nuclear service water system
NT	neutron transmitter
NTCP	near-term construction permit
NTE	not to exceed
NTEU	National Treasury Employees Union
NTF	nuclear test facility
NTIS	National Technical Information Service
NTOL	near-term operating license
NTP	National Toxicology Program	normal temperature and pressure	nuclear test plant
NTR	nuclear test reactor	nuclear testing reactor
NTS	Nevada Test Site
NTSB	National Transportation Safety Board
NU	Northeast Utilities
NUBARG	Nuclear Utility Backfitting and Reform Group
NUCLENOR	Centrales Nucleares del Norte, S.A. (Spain)
NUCLIT	Nucleare Italiana (Italy)
NUCPR	nuclear procedure requirement
NUDE	nuclear data evaluation
NUDOCS	Nuclear Documents System
NUDOCS/AD	Nuclear Documents System/Advanced Design
NUFCOR	Nuclear Fuels Corp. of South Africa
NUGEQ	Nuclear Utility Group on Equipment Qualification
NUGSBO	Nuclear Utility Group on Station Blackout
NUMAC	Nuclear Management and Control
NUMARC	Nuclear Management and Resources Council (now NEI)
NUMEC	Nuclear Materials and Equipment Corp.
NUMS	nuclear materials security
NUPEC	Nuclear Power Engineering Test Center
NUPIC	Nuclear Procurement Issues Committee
NUPLEX	Nuclear Utilities Plant Life Extension Steering Committee
NURE	national uranium resource evaluation
NUREG	NRC technical report designation (Nuclear Regulatory Commission)
NUREG/BR	NUREG brochure
NUREG/CP	NUREG conference proceedings
NUREG/CR	NUREG contractor report
NUREG/GR	NUREG grantee report
NUREG/IA	NUREG international agreement report
NUS	Nuclear Utilities Service
NUSCO	Northeast Utilities Service Company
NUSMG	Nuclear Utilities Software Management Group
NUSS	nuclear safety standard (International Atomic Energy Agency)
NUTAC	Nuclear Utility Task Action Committee
NVH	nitrogen vent header
NVLAP	National Voluntary Laboratory Accreditation Program
NW	normal waste
NWC	normal water chemistry
NWCC	neutron well coincidence counter
NWL	normal water leg
NWP	Nuclear Waste Project
NWPA	Nuclear Waste Policy Act of 1982
NWPAA	Nuclear Waste Policy Amendments Act of 1987
NWR	nuclear work request
NWS	National Weather Service
NWTRB	Nuclear Waste Technical Review Board
NYD	New York mean tide data
NYGAS	New York Gas Group
NYPA	New York Power Authority
NYPIRG	New York Public Interest Research Group
NYSADA	New York State Atomic and Space Development Authority
NYSEG	New York State Electric & Gas Corp.
NYSERDA	New York State Energy Research and Development Authority
OA	oil to air	operating authorization
OAB	Országos Atomenergia John Urban: Bizottság (Hungary)
OAC	office allegation coordinator
OAD	operational availability date
OAI	outside air intake
OAR	operational assessment and readiness
OARP	operator accelerated retraining program
OAS	Organization of Agreement States
OATP	operational acceptance test procedure
OBA	operating-basis accident
OBE	Office of Business Economics	operating-basis earthquake
OBERS	Office of Business Economics Research Service
OBRA-90	Omnibus Budget Reconciliation Act of 1990
OC	Office of the Controller (NRC)	operating curve	operations center
OCA	Office of Congressional Affairs (NRC)	overcooling accident
OCAA	Office of Commission Appellate Adjudication (NRC)
OCB	oil collection basin	oil-operated circuit breaker
OCDE	Organisation de Coopération et de Développement Economiques (France)
OCDRE	Organic-Cooled Deuterium Reactor Experiment (Canada)
OCFO	Office of the Chief Financial Officer
OCI	oxide control and indication
OCIMS	Operations Center Information Management System
OCIO	Office of the Chief Information Officer (NRC)
OCLC	Online Computer Library Center, Inc.
OCM	Office of the Commission (NRC)
OCNPP	Oyster Creek Nuclear Power Plant
OCR	operational control record
OCRE	Ohio Citizens for Responsible Energy
OCRWM	Office of Civilian Radioactive Waste Management
OD	outside diameter
ODCM	offsite dose calculation manual
ODCWT	outer-diameter creeping wave technique
ODF	onsite decontamination facility
ODSCC	outer-diameter stress-corrosion cracking	outside-diameter stress-corrosion cracking
OE	oceanic engineering	Office of Enforcement (NRC)	operating engineer	operating experience
OEC	Ohio Edison Co.
OECD	Organization for Economic Cooperation and Development
OEDO	Office of the Executive Director for Operations (NRC)
OEM	original equipment manufacturer
OER	operating event report
OERTS	operational events report tracking system
OFA	optimized fuel assembly
OFPP	Office of Federal Procurement Policy
OFZS	Österreichisches Forschungszentrum Siebersdorf, G.m.b.H. (Austria)
OG	off-gas	owners group
OGC	Office of the General Counsel (NRC)
OGE	Office of Government Ethics
OGI	off-gas isolation
OGR	ORNL (Oak Ridge National Laboratory) Graphite Reactor
OGS	off-gas system
OGST	overthread guide sleeve tool
OGTB	off-gas treatment building
OH	Ontario Hydro (Canada)
OHER	Office of Health and Environmental Research (U.S. Department of Energy)
OHLH	overhead heavy-load handling
OHRS	overflow heat removal system
OHST	overhead storage tank
OHTCS	outer head temperature control system
OI	Office of Investigations (NRC)	operating instruction	optical isolator	outstanding item
OIC	online instrument and control
OIG	Office of the Inspector General (NRC)
OIP	Office of International Programs (NRC)	operating internal pressure
OJT	on-the-job training
OL	operating license	operating limit	operator license
OLIP	online instrument package
OLMCPR	operating limit maximum critical power ratio
OLTS	operator licensing tracking system
OM	operations manager	oxide melt
O/M	oxygen to metal
O&M	operation and maintenance	Operations and Maintenance Committee of ASME
OMB	Office of Management and Budget
OMCA	organic-moderated critical assembly
OMM	operation and maintenance manual
OMR	organic-moderated reactor
O&MR	operation and maintenance report	operations and maintenance reminder
OMRCA	organic-moderated reactor critical assembly
OMRE	organic-moderated reactor experiment
OMRR	Ordnance Material Research Reactor
ONCA	outer neutron control assembly
ONE	Operations Notification and Evaluation (form)
ONS	Oconee Nuclear Station
OOS	out of sequence	out of service
OOSC	onsite operations support center
OOSS	operations officer support system
OP	Office of Personnel (NRC)	oxygen pressure
OPA	Office of Public Affairs (NRC)	operational performance assessment
OPAC	online payment and collection
OPCTR	Operations Center
OPDRV	operation with a potential for draining the reactor vessel
OPEC	Organization of Petroleum Exporting Countries
OPEN	Organisation des Producteurs d’Energie Nucléaire (France)
OPERA	out-of-pile expulsion and reentry apparatus
OPF	Official Personnel File
OPFM	outlet plenum feature model
OPL	Omega Point Laboratories
OPM	Office of Personnel Management
OPPD	Omaha Public Power District
OPR	offsite procurement request	open pool reactor
OPS	Offshore Power Systems	operational protection system	overpressure protection system	overpressurization protection system
OPST	out-of-pile systems test
OPT	optimization
OPX	off-premise extension
OpyC	outer pyrolytic carbon
OQA	operations quality assurance
OQAP	operational quality assurance plan
OR	onsite representative	operating reactor
ORA	orifice rod assembly
O-RAP	operational reliability assurance program
ORAT	operational readiness assessment team
ORAU	Oak Ridge Associated Universities
ORB	outside reactor building
ORC	online reactivity computer	operational review committee	operations review committee
ORE	occupational radiation exposure
ORFM	outlet region feature model
ORGDP	Oak Ridge Gaseous Diffusion Plant
ORIC	Oak Ridge Isochronous Cyclotron
ORISE	Oak Ridge Institute for Science and Education
ORLA	operating reactor licensing action
ORNL	Oak Ridge National Laboratory
ORO	offsite response organization
ORR	operational readiness review
ORRR	Oak Ridge Research Reactor
ORRT	operations readiness review team
ORSORT	Oak Ridge School of Reactor Technology
ORU	Orange and Rockland Utilities, Inc.
OS	operating system
OSART	operational safety assessment review team
OSC	Office of Special Counsel	Oncology Services Corporation	operational support center
OSG	operations support group
OSHA	Occupational Safety and Health Act	Occupational Safety and Health Administration (U.S. Department of Labor)
OSI	open systems interconnection
OSIP	operational support information program
OSM	optical storage media
OSP	Office of State Programs (NRC)	operational surveillance program
OSRC	Offsite Review Committee
OSRE	Operational Safeguards Response Evaluation	operational security response effectiveness
OSS	operational storage site
OST	Office of Science and Technology
OSTI	operational safety team inspection
OSTR	Oregon State University TRIGA Reactor
OSU	Oregon State University
OSUR	Ohio State University Reactor
OSVS	Outlier Seismic Verification Sheet
OT	operating temperature	operational technology
OTA	Office of Technology Assessment	open test assembly
OTC	once-through cooling
OTIS	once-through integral system
OTM	overspeed trip mechanism
OTR	organic test reactor
OTSG	once-through steam generator
OTSR	once-through superheat reactor
OTTS	operations training and technical services
OUO	official use only
OWCP	Office of Workers’ Compensation Programs
OWFN	One White Flint North
OWP	operations work procedure
OWR	Omega West Reactor
OWRR	Office of Water Resources Research
OZD	Offshore Zone of Deformation
PA	performance assessment	personnel area	pressure alarm	Privacy Act	protected area	public address	purge alarm
PAA	primary auxiliary area
PAB	preliminary as built	primary auxiliary building
PABX	private automatic branch exchange
PAC	Pilgrim Area Collaborative	protection auxiliary cabinet	public affairs coordinator
PACC	protected air-cooled condenser
PACE	plant acquisition and construction equipment
PACP	Pacific Power Co.
PACV	postaccident containment venting
PAD	performance analysis and design
PADS	Personnel Access Data System	plant alarm and display system
PAEC	Pakistan Atomic Energy Commission	Philippine Atomic Energy Commission
PAG	protective action guideline
PAHL	pressure alarm, high limit
PAHR	postaccident heat removal
PAIC	public address intercommunications system
PAIP	public affairs and information program
PAL	permissive action link	personnel airlock	programmer assistance and liaison	prototype application loop
PAM	postaccident monitoring
PAMI	postaccident monitoring instrumentation
PAMS	postaccident monitoring system
PANE	People Against Nuclear Energy
PANL	plant annunciators list
PAO	postulated abnormal occurrence	Privacy Act Officer	public affairs officer
PAP	plant administrative procedure	power ascension program
PAPAS	pin and pellet assay system
PAPUC	Pennsylvania Public Utility Commission
PAR	passive autocatalytic recombiner	Pennsylvania Advanced Reactor	performance autocatalytic report	Pool Atómico Português (Portugal)	protective action recommendation	purchasing approval request
PARD	postaccident radioactivity depletion
PARR	Pakistan Atomic Research Reactor	postaccident radioactivity removal
PARV	power-activated relief valve	power-actuated relief valve
PAS	Privacy Act statement	probabilistic analysis staff
PASNY	Power Authority of the State of New York
PASS	postaccident sampling system
PAT	performance appraisal team	plutonium air transportable	preplaced aggregate technique
PATP	power ascension testing program	power ascension test program
PATRAM	packaging and transportation of radioactive material
PAX	private automatic exchange
PB	pipe break	proportional band
PBAPS	Peach Bottom Atomic Power Station
PBE	prompt burst excursion	prompt burst experiment
PBF	power burst facility
PBI	performance-based instruction
PBNP	Point Beach Nuclear Plant
PBR	pebble bed reactor	Plum Brook Reactor
PBRE	pebble bed reactor experiment
PBRF	Plum Brook Reactor Facility
PBS	pressure boundary subsystem	project breakdown structure
PBTF	pump bearing test facility
PBX	private branch exchange
PC	personal computer	plant computer	polar crane	pressure controller	process computer	professional communication	protective clothing	protective coating
PCA	pool critical assembly	primary control assembly	primary coolant activity
PCAM	punched card accounting machine
PCAS	primary central alarm station
PCB	power circuit breaker	printed circuit board
PC&BS	project controls and budget services
PCC	plutonium concentrator concentrate	primary component cooling	process chemistry cell
PCCGC	primary containment combustible gas control
PCCS	passive containment cooling system
PCCV	precracked Charpy V-notch
PCD	plutonium concentrator distillate	power control device
PCDC	plutonium canister decontamination cell
PCDIS	plant control, data, and instrumentation system
PCETF	power conversion equipment test facility
PCHRS	passive containment heat removal system	primary containment hydrogen recombiner system
PCI	pellet/cladding interaction	personnel contamination incident	Prestressed Concrete Institute	primary containment isolation
PCIE	President’s Council on Integrity and Efficiency
PCIL	plant computer input list
PCIOMR	preconditioning interim operating management recommendation
PCIS	primary containment isolation system
PCIV	primary containment isolation valve
PCL	permissible contamination limit
PCLDI	prototype closed-loop development installation
PCLS	prototype closed-loop system
PCLT	prototype closed-loop test
PCM	pending contractual matter	power cooling mismatch
PCMI	pellet/cladding mechanical interaction
PCN	procedure change notice
PCP	post-construction permit	primary coolant pump	process control program	program control procedure
PCPS	pool cooling and purification system
PCPV	primary containment purge valve
PCR	plant change request	procedure change request	protective coating report
PCRB	personnel and control room building
PCRDL	primary control rod driveline
PCRDM	primary control rod drive mechanism
PCRM	primary certified reference material
PCRS	primary control rod system
PCRV	prestressed concrete reactor vessel
PCS	passive containment system	plant computer system	plant control system	power conversion system	pressure control system	primary coolant system	process computer system	process control sheet
PCSG	Pipe Crack Study Group
PCT	peak centerline temperature	peak cladding temperature	pellet/cladding temperature
PCTF	plant component test facility
PCTR	physical constant test reactor
PCV	pressure control valve	pressurizer control valve
PD	population density	population distribution	project director	pump discharge
PDA	predocketed application	preliminary design acceptance	preliminary design analysis	preliminary design approval	preliminary design assessment	preliminary design authorization
PDAS	plant data acquisition system
PDB	plant damage bin
PDC	predocketed construction	preliminary design criterion/criteria	principal design criterion/criteria
PDCO	plant design control office
PDD	Presidential Decision Directive	projected decision date	prospective decision date
PDES	preliminary draft environmental statement
PDF	plant design factor	probability density function	project design flood
PDH&DS	plant data handling and display system
PDHS	plutonium decontamination and hot shop
PDI	Performance Demonstration Initiative
PDIL	power-dependent insertion limit
PDL	power distribution limit
PDMS	postdefueling monitored storage
PDP	positive displacement pump	Process Development Pile	project definition phase
PDR	preliminary design report	pressurized deuterium reactor	public document room
PDRP	program data requirement plan
PDS	plant damage state	plant data system	power distribution system	predocketed special	project decision schedule	project descriptive summary
PDT	performance discharge test
PDTS	permanently defueled technical specification
PE	power engineering	project engineer
PEAP	procurement engineering assessment plan
PECO	Philadelphia Electric Co.
PEDS	protective equipment decontamination section
PEF	potential enforcement finding
PEIS	programmatic environmental impact statement
PEL	power electronics
PEMA	Pennsylvania Emergency Management Agency
PENELEC	Pennsylvania Electric Company
PEO	patrol emergency officer	plant equipment operator
PEP	performance enhancement program
PEPCO	Potomac Electric Power Co.
PEPR	precision encoder and pattern recognition
PER	problem event report	procurement evaluation request
PERMS	process and effluent radiological monitoring system
PERMSS	process and effluent radiological monitoring and sampling system
PERT	program evaluation and review technique	program evaluation report technique
PET	performance evaluation team	permanent equipment transfer
PETA	plutonium equipment transfer area
PETN	pentaerythritol tetranitrate
PETS	procedure for evaluating technical specifications
PETTE	post-emergency tabletop exercise
PEWS	plutonium equipment warm shop
PF	partition factor	prefilter	Progressive Foundation	proposed finding	protection factor	purge fan
PFCS	primary flow control system
PFD	process flow diagram
PFDAS	plant fire detection and alarm system
PFE	plenum fill experiment
PFES	proposed final environmental statement
PFG	paper flow group	piping and filter gallery
PFPCDS	plant fire protection carbon dioxide subsystem
PFPHS	plant fire protection Halon subsystem
PFPS	plant fire protection system
PFPWS	plant fire protection water subsystem
PFR	Prototype Fast Reactor (United Kingdom)
PFS	peripheral fixed shim	private fuel storage
PFSF	private fuel storage facility
PG	particulate and gas
PGA	peak ground acceleration
PGCC	power generation control complex
P&GD	policy and guidance directive
PGDS	pressurized gas distribution system
PG&E	Pacific Gas & Electric Co.
PGG	power generation group
PGP	procedures generation package
PGQ	potentially generic question
PHA	pulse-height analyzer
PHERMEX	pulsed high-energy radiographic machine-emitted x-ray
PHF	plug-handling fixture
PHGA	peak horizontal ground acceleration
PHR	process heat reactor
PHS	Public Health Service
PHSPS	preservation, handling, storage, packaging, and shipping
PHTS	primary heat transport system
PHWR	pressurized heavy-water-moderated and -cooled reactor	pressurized heavy-water reactor
PI	performance indicator	physical inventory	plasticity index	position indication	pressure indicator	process instrumentation	proportional integral	purge isolation
P&I	piping and instrumentation
PIA	pressure indicator alarm
PIC	pressure-indicating controller	pressurized ion chamber	public information center
PICAN	Prairie Island Coalition Against Nuclear Storage
PID	partial initial decision	piping and instrumentation diagram
P&ID	piping and instrumentation diagram
PID	position indication device	project identification	proportional integral derivative
P&ID	piping and instrumentation diagram	piping and instrumentation drawing	process and instrumentation diagram
PIDS	project identification summary
PIE	postirradiation examination	postirradiation experiment
PIF	pool irradiation facility	problem identification form	pressure-injected footing
PIL	Plant Issues List (now the Plant Issues Matrix)
PIM	Plant Issues Matrix (formerly the Plant Issues List)
PIMS	pooled inventory management system
PIN	piping interference notification	potential interference notification
PING	particulate, iodine, and noble gas
PINGP	Prairie Island Nuclear Generating Plant
PINSTECH	Pakistan Institute of Nuclear Science and Technology
PIO	public information officer
PIOTA	postirradiation open test assembly	proximity-instrumented open test assembly
PIP	Performance Indicator Program	performance improvement plan	performance improvement program	position indication probe	Probabilistic Risk Assessment (PRA) Implementation Plan	problem investigation plan	prototypic inlet piping
PIPPAP	pile for producing power and plutonium
PIR	Petrolite Irradiation Reactor	plant internal report	problem identification report	problem investigation report
PIRG	Public Interest Research Group
PIRR	pipe inspection round robin
PIRT	phenomena identification and ranking table
PIS	pressure-indicating switch	process instrumentation system
PISA	Project Integrated Safety Assessment
PISC	Program for the Inspection of Steel Components
PIV	pressure-indicating valve	pressure isolation valve
PIXIE	proton-induced x-ray emission
PL	panel left	piping load	plastic limit	public law
PLATR	Pawling lattice test rig
PLBR	prototype large breeder reactor
PLC	power-line carrier
PLCEA	part-length control element assembly
PLCEDM	part-length control element drive mechanism
PLEX	plant life extension
PLOCAP	post-loss-of-coolant-accident protection
PLR	policy and labor relations
PLS	precautions, limitations, and set points
PLT	Princeton Large Torus
PM	photomultiplier	pressure multiplier	preventive maintenance	program manager	project manager	protective measure
PMA	personnel management analyst	plastic moderated assembly
PMC	programmable machine controller	Project Management Corporation	protective measures coordinator
PME	process and manufacturing engineering
PMF	probable maximum flood
PMH	probable maximum hurricane
PMI	plant manager instruction
PMIS	plant monitoring and information system	precision mechanisms in sodium
PML	probable maximum loss
PMM	pedestal-mounted manipulator
PMNP	platform-mounted nuclear plant
PMOG	plutonium maintenance and operating gallery
PMP	preoperational monitoring program	preventive maintenance procedure	probable maximum precipitation	program manual procedure
PMR	plant modification request	project manager report
PMS	performance measurement system	plant monitoring system	primary makeup system	probable maximum surge	program management staff
PMT	photomultiplier tube	postmaintenance testing
PMU	plant makeup
PMW	probable maximum wind
PMWP	probable maximum winter precipitation
PMY	professional man-year
PN	plant normal	preliminary notification
PNA	pulsed neutron activation
PNE	peaceful nuclear explosion
PNET	Peaceful Nuclear Explosion Treaty
PNL	Pacific Northwest Laboratory
PNNL	Pacific Northwest National Laboratory
PNO	preliminary notification of occurrence
PNPP	Palisades Nuclear Power Plant	Perry Nuclear Power Plant
PNR	Pittsburgh Naval Reactors Office
PNS	preliminary notification of safeguard
PNSRC	plant nuclear safety review committee
PNWL	Pacific Northwest Laboratory
PO	project officer	purchase order
POA	provisional operating authorization
POAH	point of adding heat
POD	point of discharge	probability of detection	PWR (pressurized-water reactor) oxide decontamination
PODCI	probability of detection and correct interpretation
POF	probability of failure
POG	piping and operating gallery
POGE	Portland General Electric Co.
POGO	Project on Government Oversight
POIS	prototype online instrument system
POL	possession-only license	provisional operating license
POM	position modulator
POP	peak overpressure	proof of principle
POPR	prototype organic power reactor
POPS	pressurizer overpressure protection system
POQAP	plant operational quality assurance procedure
POR	plant operations review	plutonium organic recycle
PORACC	principle of radiation and contamination control
PORC	plant operations review committee
PORV	pilot-operated relief valve	power-operated relief valve
POS	plant operating system	plant operational state	point of sale
POSA	preliminary operating safety analysis/analyses
POTC	Power Operations Training Center
PP	primary pressure
PPA	plutonium preparation area	power plant attendant	Princeton-Pennsylvania Proton Accelerator	probabilistic performance assessment
PPC	Pennsylvania Power Co.	plutonium process cell	plutonium product cell	pore pressure cell
PPDD	preliminary project design description
PPDI	plant process display instrumentation
PPDIL	pre-power-dependent insertion limit
PPE	personnel program effectiveness
PPFR	plutonium product filter room
PPG	policy and planning guidance
PPH	primary pump house
PPIS	plant protection and instrumentation system
PP&L	Pennsylvania Power & Light Co.
PPL	Plasma Physics Laboratory	plutonium product loadout	priority placement list
ppm	part per million
PPM	procedure preparation manual
PPMIP	plant performance and management improvement program
PPNM	physical protection of nuclear materials
PPP	point-to-point protocol	portable plotting package
PPPG	policy, planning, and program guidance
PPR	plant performance review
PPS	plant protection system	plant protective system	plutonium product storage	primary power system
pps	pulse per second
PPSAS	program planning and status assessment system
PPSP	power plant siting program
PPSPS	plutonium product shipping preparation station
PPSV	plutonium product storage vault
PQAD	plant quality assurance director
PQAM	project quality assurance manager
PQAP	project quality assurance plan
PQR	procedure qualification record
PR	Philippine Reactor	plant recovery	power range	press release	pressure recorder	procurement request	proposed rule
PRA	Paperwork Reduction Act of 1995	plutonium recycle acid	probabilistic risk analysis/analyses	probabilistic risk assessment
PRAF	probabilistic risk assessment fundamentals
PRATTP	probabilistic risk assessment technology transfer program
PRB	plant review board	procedure review board
PRBSG	pseudo-random binary sequence generator
PRC	Planning Research Corp.	plutonium rework cell	pressure recorder controller
PRCF	plutonium recycle critical facility
PRD	potentially reportable deficiency
PRDC	Power Reactor Development Co.
PRE	processing refabrication experiment
PREACS	penetration room exhaust air cleanup system	pump room exhaust air cleanup system
PRF	penetration room filtration
PRG	procedure review group
PRHR	passive residual heat removal
PRISIM	plant risk status information management
PRISM	power reactor inherently safe module
PRL	postulated rupture location
PRM	personal radiation monitor	petition for rulemaking	power range monitor	process radiation monitor	proposal for rulemaking
PRMS	process radiation monitoring system
PRNC	Puerto Rico Nuclear Center
PROM	programmable read-only memory
PROS	Professional Reactor Operator Society
PRR	Pawling Research Reactor	Philippines Research Reactor	pressure rise rate	Puerto Rico Reactor
PRRWS	public risk reduction worksheet
PRS	pressure response spectrum/spectra	process radiation sampler
PRSC	plutonium rework sample cell
PRT	pressurized relief tank	prompt relief trip
PRTR	plutonium recycle test reactor
PRTS	pressurizer relief tank system
PRV	pressure relief valve
PRVS	penetration room ventilation system
PRWRA	Puerto Rico Water Resources Authority
PS	Pilgrim Station	policy statement	power supply	pressure switch	pressurizer surge
PSA	personnel and service area	plant-specific action	probabilistic safety analysis/analyses	probabilistic safety assessment
PSAR	preliminary safety analysis report
PSB	personnel services building	plant service building
PSC	plant safety committee	plutonium stripping concentrate	Public Service Commission	Public Service Co. of Colorado
PSCD	plutonium stripping concentration distillate
PSCS	plant supervisory control subsystem
PSD	power spectral density	power spectrum density
PSDAR	post-shutdown decommissioning activities report
PSDD	preliminary system design description
PSDF	power spectrum density function
PSE	pressurized subcritical experiment
PSE&C	power supply engineering and construction
PSE&G	Public Service Electric & Gas Co.
PSER	preapplication safety evaluation report
PSF	performance shaping factor	personnel security file	plutonium stripper feed	poolside facility
PSH	pressure switch, high
PSHA	probabilistic seismic hazard assessment
PSI	preservice inspection	prioritization of safety issues
PSID	preliminary safety information document
PSIN	Public Service Co. of Indiana, Inc.
PSMD	Public Service of Maryland
PSMS	plant safety monitoring system
PSNH	Public Service Co. of New Hampshire
PSNM	Public Service Co. of New Mexico
PSNP	Pebble Springs Nuclear Plant
PSOK	Public Service Co. of Oklahoma
PSP	physical security plan	primary sodium pump
PSPGV	primary sodium pump guard vessel
PSPL	Puget Sound Power and Light Co.
PSQ	personnel security questionnaire
PSR	Pennsylvania State University Research Reactor	peripheral shim rod	permanent side reflector	plant status report	primary system relief	procurement status report
PSR&D	primary sodium removal and decontamination
PSRM	post-scram reactivity monitor
PSS	primary sampling system	probabilistic safety study	process sampling system
PSSA	preclosure systems safety analysis/analyses
PSSAR	preliminary standard safety analysis report
PSSP	primary sodium sampling package
PSSPS	primary sodium storage and processing system
PST	pressure suppression tank	primary surge tank
PSTF	pressure suppression test facility	proximity sensor test facility	pump seal test facility
PSTG	plant-specific technical guidelines
PSU	Publication Sales Unit
PSUR	Pennsylvania State University Reactor
PSV	pressurizer safety valve
PSW	plant service water
PSWG	plant-specific writers guide
PSWS	potable and sanitary water system
PT	penetrant test	penetrant testing	periodic test	periodic testing	phototransistor	pool temperature	preoperational test	preoperational testing	pressure and temperature	pressure transmitter
P/T	pressure and temperature
PTC	passive thermal control	post-turnover change
PTE	part-time equivalent	physics test exception
PTFG	Probabilistic Risk Assessment (PRA) Training Focus Group
PTI	pipe test insert	plugging temperature indicator
PTL	Pittsburgh Testing Laboratory
PTM	plant temporary modification
PTP	peak to peak	preoperational test program	proximity test plug
PTR	performance trend report	pool test reactor	pool training reactor	pressure tube reactor	programmer trouble report	proof test reactor
PTS	pressurized thermal shock
PTSE	pressurized thermal shock experiment
PTSF	pressurized thermal shock facility
PT/SP	pressure tube-to-spool piece
PTSR	pressure tube superheat reactor
PTSTF	pressurized thermal shock test facility
PUA	plant-unique analysis/analyses
PUAAG	plant-unique analysis-applications guide
Pub.	L.Public Law
PUC	Public Utility Commission
PUD	paired uranium detectors	public utility district
PULSTAR	pulsed training assembled reactor
PUP	peak underpressure	plutonium utilization program
PUR	Purdue University Reactor
PURPA	Public Utilities Regulatory Policy Act of 1978
PUSPATI	Pusat Penyelidikan Atom Tun Ismail (Malaysia)
PV	photovoltaic	pressure valve	pressure vessel
PVC	polyvinyl chloride
PVHA	probabilistic volcanic hazard assessment
PVLC	penetration valve leakage control
PVNGS	Palo Verde Nuclear Generating Station
PVORT	pump and valve operability review team
PVRC	Pressure Vessel Research Committee
PVS	plant vent stack	pressure vessel simulation
PVTI	piping and valve test insert
PW	potable water
P&W	Pratt and Whitney
PWG	principal working group (NEA)
PWHA	plutonium waste-handling area
PWHT	postweld heat treatment
PWR	pipe whip restraint	pressurized-water reactor
PWROG	Pressurized-Water Reactor Owners Group
PWSCC	primary water stress-corrosion cracking
PWST	protected water storage tank
PyC	pyrolytic carbon
PZR	pressurizer
PZR	LCSpressurizer level control system	PCSpressurizer pressure control system
QA	quality assurance
QAA	quality assurance audit
QAC	quality assurance checklist	quality assurance criterion/criteria
QAI	quality assurance instruction
QAIP	quality assurance inspection procedure
QAIRG	quality assurance installation review group
QAM	quality assurance manual
QA&O	quality assurance and operations
QAP	quality assurance procedure	quality assurance program
QAPI	quality assurance program index
QAPP	quality assurance program plan
QA/QC	quality assurance/quality control
QAR	quality assurance requirement	quality assurance representative
QC	quality control
QCI	quality control instruction
QCIP	quality control inspection procedure
QCIR	quality control inspection report
QCP	quality control procedure
QCS	Quad-Cities Station
QDO	quantitative design objective
QDPS	qualified display processing system
QE	quality engineer
QF	quality factor	quality form
QHO	qualitative health objective	quantitative health objective
QHR	quality history record
QIT	quality improvement team
QLR	quick-look report
QMP	qualification maintenance program	quality management program
QO	quick opening
QOBV	quick-opening blowdown valve
QPM	quality program manager
QPT	quadrant power tilt
QPTR	quadrant power tilt ratio
QR	quality revalidation
QS	quench spray
QSC	quality systems certificate
QSP	quality systems program
QSPDS	qualified safety parameter display system
QSR	quarterly statistical report
QSTF	quarter-scale test facility
QTC	Quality Technology Co.
QTP	quality test plan
QV	quality verification
QVFI	quality verification functional inspection
QVI	quality verification inspection
RA	reduction of area
RA	regional administrator	Robotics and Automation Council
R/A	reliability/availability
RAB	reactor auxiliary building
RABNVS	reactor auxiliary building normal ventilation system
RABSRVS	reactor auxiliary building switchgear room ventilation system
RABV	reflood assist bypass valve
RAC	radiological assessment coordinator	regional assistance committee	report of abnormal condition
RACES	Radio Amateur Civil Emergency Service
RACS	rod action control system
rad	radiation absorbed dose
RAD	rapid access data
RADCON	radiologic control
RADS	radiation and dosimetry service
RAI	request for additional information
RAIP	requester’s approval in principle
RAM	radioactive material	random access memory	reliability, availability, and maintainability
RAMS	regulatory activities manpower system
RANNP	Research Applied to National Needs Program
RAOC	relaxed axial offset control
RAP	radiological assistance plan	reliability assurance plan	remedial action program	restart action plan
RAPS	radioactive argon processing system
RAPTUS	rapid thorium-uranium system
RAREF	radiation and repair engineering facility
RARP	reliability assessment research program
RAS	reactor analysis and safety	recirculation actuation signal	remote acquisition station
RASCAL	Radiological Assessment System for Consequence Analysis
RAT	radiological assessment team	radiological assistance team	reserve auxiliary transformer
RATI	readiness assessment team inspection	restart assessment team inspection
RAW	risk assessment worth
RB	reactor building
RBA	radial blanket assembly
RBAL	reprocessing building analytical laboratory
RBC	reactor building cooling
RBCCW	reactor building closed-cooling water
RBCLCW	reactor building closed-loop cooling water
RBCLCWS	reactor building closed-loop cooling water system
RBCR	reprocessing building control room
RBCS	reactor building cooling system
RBCU	reactor building cooling unit
RBCW	reactor building cooling water
RBE	relative biological effectiveness
RBEDT	reactor building equipment drain tank
RBESI	reactor building exhaust system isolation
RBFC	reactor building fan cooler
RBHS	reactor building heating system
RBM	rod-block monitor
RBOF	receiving basin for offsite fuel
RBP	reactor building protection
RBPVS	reactor building purge ventilation system
RBS	reactor building spray	River Bend Station
RBSI	reactor building spray injection
RBSR	reactor building spray recirculation	reactor building spreading room	reprocessing building spreading room
RBTL	reactor building truck lock
RBVI	reactor building ventilation isolation
RBVPRM	reactor building vent process radiation monitor
RC	reactor cavity	reactor coolant	recording controller	rigid confinement
RCA	Radiation Control Agency	radiological controlled area	reactor coolant activity	root cause analysis
RCAP	root cause analysis program
RCB	reactor containment building
RCBHT	reactor coolant bleed holdup tank
RCBT	reactor coolant bleed tank
RCC	Radiochemical Centre Ltd. (U.K.)	reactor closed-cooling	rod cluster control
RCCA	rod cluster control assembly
RCCS	reactor cavity cooling system
RCDT	reactor coolant drain tank
RCE	reactor compatibility experiment
RCEP	Radiological Contingency and Emergency Plan
RCFC	reactor containment fan cooler
RCG	radioactivity concentration guide	recommended concentration guide
RCGM	reactor cover gas monitor
RCIC	reactor core isolation coolant	reactor core isolation cooling
RCICS	reactor core isolation cooling system
RCIS	rod control and information system
RCL	reactor coolant loop
RCLC	reactor coolant letdown cooler
RCM	reliability-centered maintenance	Response Coordination Manual
RCMU	reactor coolant makeup
RCN	Reactor Centrum Nederland (Netherlands)
RCP	radiological control program	reactor characterization program	reactor coolant pump
RCPB	reactor coolant pressure boundary
RCPS	reactor coolant pump system
RCRA	Resources Conservation and Recovery Act
RCS	reactor coolant system
R&CS	radiological and chemical support
RCSI	reactor coolant system integrity
RCSIL	rapid communication service information letter
RCSS	reactor core subsystem
RCT	response coordination team	rework/completion tag
RC&T	radiation control and test
RCTS	reactor coolant treatment system
RCTWS	railroad car and truck wash station
RCV	radiation control valve
RCW	raw cooling water	reactor cooling water	recirculating cooling water
RD	random driver	receipt day	requirements document	restricted data
R&D	research and development
RDA	rod drop accident
RDAT	remote data acquisition terminal
RDAU	remote data acquisition unit
RDDM	reactor deck development mockup
RDH	radioactive drain header
RDO	regional duty officer
RDOS	real-time disk operating system
RDP	reactor development program
RDS	reactor depressurization system
RDSD	reliability design support document
RDT	reactor development and technology	reactor drain tank
RE	radiation equipment	rare earth	right end
REA	radiologic engineering assessment	recycle acid	rod ejection accident	Rural Electrification Administration
REAC	Radiological Emergency Assistance Center (Oak Ridge, Tennessee)
REBA	relativistic electron beam accelerator
REC	radiant energy conversion
RECC	radiological effluent control commitment
RECHAR	recombiner charcoal adsorber
RECS	radiological emergency communications system
RECW	reactor enclosure cooling water
REETS	radiological effluent and environmental technical specification
REHR	reactor heat removal
REI	request for engineering investigation
REIC	Radiation Effects Information Center
REIRS	Radiation Exposure and Information Reporting System
REL	radiation evaluation loop	reactor equipment limited
REM	realistic evaluation model
rem	roentgen equivalent man
REMODCM	radiological effluent monitoring and offsite dose calculation manual
REMP	radiological environmental monitoring program
REP	radiological emergency plan	resonance escape probability
rep	roentgen equivalent physical
RER	radiation effects reactor	radioactive effluent release	regulatory effectiveness review	representative for experiment review	risk evaluation report
RERC	radiological emergency response coordination
RERO	radiological emergency response operation
RERP	radiological emergency response planning
RERS	reactor enclosure recirculation system
RERTR	reduced enrichment for research and test reactors
RES	Nuclear Regulatory Research, Office of (NRC)
RES	INSPresident inspector
RESAR	reference safety analysis report
RESC	reactor subcriticality
RESL	Radiological and Environmental Sciences Laboratory
RETS	radiological effluent technical specification	radiological environmental technical specification
REVAB	relief valve augmented bypass
REW	recycle water
RF	radiofrequency	release factor	reply finding
RFA	Regulatory Flexibility Act	removable fuel assembly
RFC	recirculation flow control	request for comments
RFCS	recirculation flow control system
RFI	radio frequency interference	request for information
RFIC	request for information or clarification
RFN	remote filter niche
RFO	refueling outage
RFP	reactor feed pump	request for procurement	request for proposal	reversed field pinch	Rocky Flats Plant
RFPA	request for procurement action
RFPT	reactor feed pump turbine
RFQ	request for quotation
RFT	revisable format text
RFW	reactor feedwater
RFX	reversed field experiment
RG	regulated gallery	regulatory guide
R.G.	regulatory guide
RG&E	Rochester Gas & Electric Corp.
RGM	radiogas monitor
RGR	rare-gas recovery
RH	relative humidity
RHC	reactor head cooling
RHR	residual heat removal
RHRP	residual heat removal pump
RHRS	residual heat removal system
RHRSW	residual heat removal service water
RHT	recycle holdup tank
RHTS	reactor heat transport system
RHX	regenerative heat exchanger
RI	radiation indicator	reactor island	Region I–King of Prussia, Pennsylvania (NRC)	resident inspector	resonance integral
R&I	removal and installation
RIA	reactivity-initiated accident	reactivity insertion accident	regulatory impact analysis or analyses	removable instrument assembly
RIAEC	Rhode Island Atomic Energy Commission
RIB	recruitment, incentives, and benefits
RICO	Racketeering Influenced and Corrupt Organizations Act
RIDR	receipt inspection data report
RIDS	receiving inspection data status	regulatory information distribution system
RIE	Replacement Item Evaluation
RIENA	Rassegra Internazionale Elettrònica Nucleare ed Aerospaziale (Italy)
RIF	reduction in force
RIG	risk-based inspection guide
RII	receiving inspection instruction	Region II–Atlanta, Georgia (NRC)
RIIC	rotary inertia included case
RIII	Region III–Lisle, Illinois (NRC)
RIL	research information letter
RIM	relative importance measure
RIMS	regional input-output modeling system
RINA	Registro Italiano Navale (Italy)
RIOPR	Rhode Island Open Pool Reactor
RIOT	remote input-output terminal
RIP	reactor internal pump	receiving inspection plan
RIPBR	risk-informed, performance-based regulation
RIPS	radioisotope power supply
RIR	radiological incident report	receipt inspection report	risk increase ratio
RIRP	Regulatory Issue Resolution Plan
RIS	reporting identification symbol	reservoir-induced seismicity
RISC	reduced instruction set computer
RISS	reactor internals subsystem
RITS	regulatory information tracking system	resource information tracking system
RIV	reactor isolation valve	Region IV–Arlington, Texas (NRC)
RJE	remote job entry
RKS	Raadet foer Kaernkraftsaekerhet (Sweden)
RL	reactor licensing	refracted longitudinal
RLE	review-level earthquake
RLO	Records Liaison Officer
RLOP	reactor licensing operating procedure
RLR	radioactive lighting rod
RM	radiation monitor	radiation monitoring	radiometric monitor	reactor manufacturer	remote manual	rulemaking
RMAAS	reactivity monitoring and alarm system
RMBCS	Rocky Mountain Bank Card System
RMC	Radiation Management Corporation	remote manual control
RM&C	reactor monitoring and control
RMCS	reactor makeup control system	reactor manual control system
RME	reasonable maximum exposure
RMF	reactivity measurement facility
RMIEP	risk methodology integration and evaluation program
RMP	risk management plan
RMRM	radioactive materials reference manual
RMS	radiation monitoring system	radiological monitoring system	regulatory manpower system	remote manual switch
RMW	reactor makeup water
RMWS	reactor makeup water storage
RMWST	reactor makeup water storage tank
RMWT	reactor makeup water tank	reactor makeup water transfer
RNA	ribonucleic acid
RNB	research nuclear battery	return to nucleate boiling
RNDT	reference nil ductility temperature
RNWP	reduced notch worth procedure
RO	reactor operator	regional office	remain open	reportable occurrence	restriction orifice	reverse osmosis
ROD	release order directive
ROI	region of interest
ROM	read only memory
ROP	record of purchase
ROS	requisition on stores
ROSA	Rig of Safety Assessment
ROSENERGO-ATOM	Nuclear Power Utility (Russia)
ROSPA	risk-based operational safety performance assessment
ROW	requisition on warehouse	right of way
RP	radiation protection	reactor pool	reactor pressure	reactor project	release point
RPAM	regional public affairs manager
RPAO	regional public affairs officer
RPAS	reactor protection actuating signal
RPB	reactor pressure boundary
RPC	Radiation Policy Council	Radiation Protection Committee	remote process cell	rod pattern controller	rotating pancake coil
RPCB	reactor power cutback
RPCC	remote process crane cave
RPCS	reactor plant control system
RPCWS	reactor plant cooling water system
RPD	reactor plant designer
RPDF	radiation protection design feature
RPE	radiation protection engineer	resource planning and evaluation
RPF	region peaking factor	right panel front
RPG	radiation protection guide	report program generator
RPI	relative position indication	rod position indicator
RPIS	rod position indication system	rod position information system
RPM	radiation protection manager
RPO	radiation protection officer
RPP	radiation protection plan
RPPS	reactor plant and process sampling
RPS	radiation protection supervisor	Reactor Program System	reactor protection system	regulatory performance summary
RPST	reaction products separator tank
RPT	radiation protection technician	reactor for physical and technical	recirculation pump trip
RPV	reactor pressure vessel
RPVI	reactor pressure vessel integrity
RPVRI	reactor pressure vessel reflective insulation
R&QA	reliability and quality assurance
RQD	rock-quality designation
RR	receiving report	review report	review request
RRA	Radiation Research Associates, Inc.	risk-reduction analysis/analyses
RRC	radiation recorder controller	reactor recirculation cooling
RRD	retendering receipt day
R&RE	radiation and repair engineering
RRG	regulatory response group	regulatory review group	research review group
RRI	resident reactor inspector
RRP	reactor recirculation pump	reactor refueling plug
RRPI	relative rod position indication	rotary relative position indicator
RRR	Raleigh Research Reactor
RRRC	Regulatory Requirements Review Committee
RRS	reactor recirculation system	reactor refueling system	reactor regulating system	required response spectrum/spectra	resin regeneration subsystem
RRTF	Regulatory Reform Task Force
RRW	risk reduction worth
RS	radiation source	reactor safeguards	reactor safety	reactor system	recirculation spray	reference section
RSA	remote shutdown area
RSAO	Regional State Agreements Officer
RSARR	Republic of South Africa Research Reactor
RSB	reactor service building
RSC	radiation safety committee	reactor safety coordinator	reactor site criterion/criteria
RSCE	reserve shutdown control equipment
RSCM	reserve shutdown control material
RSCS	reactor sequence control system	rod sequence control system
RSCW	Research Reactor, State College of Washington
RSD	relative standard deviation	responsible system designer
RSE	reserve shutdown equipment
RSEP	Robinson Steam Electric Plant
RSH	resin sluice header
RSHX	recirculation spray heat exchanger
RSI	reactor siting index
RSIC	Radiation Shielding Information Center
RSK	Reaktorsicherheitskommission (Germany)
RSLO	regional State liaison officer
RSNGS	Rancho Seco Nuclear Generating Station
RSO	radiation safety officer	reactor system outline
RSP	reactivity surveillance procedure	remote shutdown panel	rotating shield plug
RSPE	recruitment, staffing, and position evaluation
RSR	radiological safety review	reactor safety research	reference safety report
RSS	reactor safety study	reactor shutdown system	relay setting sheet	remote shutdown system	reserve shutdown system
RSSF	retrievable surface storage facility
RSSMAP	Reactor Safety Study Methodology Application Program
RSST	reserve station service transformer
RSW	raw service water
RT	radiographic test	reactor trip	reference temperature
RTB	reactor trip breaker
RTC	regional training center	removable top closure
RTCB	reactor trip circuit breaker	run to cladding breach
RTD	resistance temperature detector	resistance temperature device	Roentgen Technische Dienst B.V. (Netherlands)
RTDP	reactor technology development plan	revised thermal design procedure
RTE	relocation tabletop exercise	residual total elongation
RTG	radioactive thermoelectric generator	radioisotope thermoelectric generator
RTGB	reactor turbine generator board
RTL	radioisotope transport loop
RTM	reactor trip module	regulatory technical memorandum/memoranda	Response Technical Manual
Rtndt	reference temperature nil ductility
RTNSS	regulatory treatment of nonsafety systems
RTO	reactor trip override
RTP	rated thermal power	restart test program
RTS	reactor trip system	refueling water transfer and storage
RTSS	reactor trip switchgear system
RTT	reference transition temperature
RTV	room temperature vulcanizing
R&U	repairs and utilities
RV	Reactor Venezolano (Venezuela)	reactor vessel	release valve	relief valve
RVC	reactor volume control	remote valve control
RVDP	relief valve discharge piping
RVHVS	reactor vessel head vent system
RVID	Reactor Vessel Integrity Database
RVIS	reactor vessel instrumentation system
RVLIS	reactor vessel level instrumentation system
RVLM	reactor vessel level monitoring
RVRLIS	reactor vessel refueling level indication system
RVS	reactor vessel system
RVSS	reactor vessel support structure
RVUH	reactor vessel upper head
RW	raw water	Ringsdorff-Werke, G.m.b.H. (Germany)	river water
RWA	radwaste area
RWB	rod withdrawal block
RWC	reactor water cleanup
RWCS	reactor water cleanup system
RWCU	reactor water cleanup
RWDS	radwaste disposal system
RWE	Rheinisch-Westfälisches Elektrizitätswerk, A.G. (Germany)	rod withdrawal error
RWL	reactor water level	rod withdrawal limiter
RWM	rod worth minimizer
RWN	room work notification
RWP	radiation work permit	radwaste work permit
RWPC	radwaste process cell
RWPH	river water pump house
RWR	radioactive waste reduction
RWS	radwaste system
RWSF	radwaste solidification facility
RWSP	refueling water storage pool
RWSS	radwaste sample station
RWST	refueling water storage tank
RWT	radiation worker training	refueling water tank
RWTA	river water treatment area
RWTS	regenerant waste treatment subsystem
RWV	radioactive waste vent
RY	reactor-year
SA	safety analysis/analyses
SA	safety assessment	service air	system administrator
S/A	subassembly
S&A	surveillance and accountability
SAAEB	South African Atomic Energy Board
SAC	Systems Automation Corp.
SAD	safety analysis diagram	safety assurance diagram	systems, assistant director
SADE	superheat advanced demonstration experiment
SAE	site area emergency	Society of Automotive Engineers
SAFDL	specified acceptable fuel design limit
SAFE	safeguards automated facility evaluation	Society for the Advancement of Fission Energy
SAFO	Swedish Atomic Forum
SAFR	sodium advanced fast reactor
SAFT	synthetic aperture focusing technique
SAG	senior advisory group
SAGSI	Standing Advisory Group on Safeguards Implementation
SAI	Science Applications, Inc.
SAIC	Science Applications International Corp. (formerly Science Applications, Inc.)
SAID	safety analysis input data
SAIGE	Società di Architettura Industriale per Gli Impiantidi Generazione de Energia, SpA (Italy)
SAL	service advisory letter
SALE	safeguards analytical laboratory evaluation
SALP	systematic assessment of licensee performance
SAM	stabilized assay meter	substitute alloy material
SAMA	Scientific Apparatus Makers Association
SAMDA	severe accident mitigation design alternative
SAMG	severe accident management guidelines
SAMIS	structural analysis and matrix inversion system
SAN	standard address number
SAP	Severe Accident Program	Special Access Program	startup administrative procedure	synthetic aperture program
SAPHIRE	Systems Analysis Program for Hands-on Integrated Reliability Evaluation
SAPL	Seacoast Antipollution League
SAPS	Shippingport Atomic Power Station
SAQV	safety assessment and quality verification
SAR	safety analysis report
SARA	severe accident risk assessment	systems analysis and risk assessment
SAREF	safety research experiment facility
SARP	Severe Accident Reduction Program	Severe Accident Research Plan	Severe Accident Research Program
SARRP	Severe Accident Risk Reduction Program
SART	site access refresher training
SAS	safety assessment system	secondary alarm station	security agency study	service air system	station air system
SASA	severe accident sequence analysis/analyses
SAT	site access training	spray additive tank	startup auxiliary transformer	station auxiliary transformer	systems approach to training l’Energie Nucléaire (France)
SAVC	structural assembly verification card
SAVS	safeguards area ventilation system
SAW	steam, air, water	submerged arc weld	submerged arc welding
SAYG	sign-as-you-go
SBA	Small Business Administration
SBACS	shield building air cleanup system
SBAECS	shield building air exhaust cleanup system
SBC	steam bypass control
SBCC	steam bubble collapse induced
SBCR	Small Business and Civil Rights, Office of (NRC)
SBCS	steam bypass control system
SBFAS	shield building air filtration actuation system
SBFU	stuck breaker failure unit
SBGT	standby gas treatment
SBGTS	standby gas treatment system
SBIR	Small Business Innovative Research
SBK	Schnell-Brüter-Kernkraftwerksgesellschaft, m.b.H. (Germany)
SBLC	standby liquid control
SBLOCA	small-break loss-of-coolant accident
SBO	station blackout
SBOC	superheated blowdown outside containment
SBR	Soviet Breeder Reactor
SBREFA	Small Business Regulatory Enforcement Fairness Act
SBVS	shield building ventilation system
SBWR	simplified boiling-water reactor
SC	safety class	secondary confinement	site characterization	site contingency	speed controller	surveillance compliance
SCA	secondary control assembly	simulated core assembly	single-channel analyzer	site characterization analysis/analyses	small component autoclave	sneak circuit analysis/analyses
SCAT	spray chemical addition tank
SCBA	self-contained breathing apparatus
SCBR	steam-cooled breeder reactor
SCC	shutdown cooling circulator	specialized common carrier	stress-corrosion cracking
SCCS	secondary chemical control system	shutdown cooling circulator subsystem	sodium chemistry control system	standby core cooling system
SCD	severe core damage	significant construction deficiency
SCDAP	severe core damage analysis package
SCDWMR	steam-cooled deuteriated water-moderated reactor
SCE	saturated calomel electrode	situation-caused error	Southern California Edison Co.
SCEAR	Scientific Committee on the Effects of Atomic Radiation
SCEG	South Carolina Electric & Gas Co.
SCE&G	South Carolina Electric & Gas Co.
SCEL	small-component evaluation loop
SCEW	system component evaluation worksheet
SCF	SNAP critical facility	sodium cleaning facility
SCFBR	steam-cooled fast breeder reactor
scfh	standard cubic foot/feet per hour
scfm	standard cubic foot/feet per minute
SCFS	secondary containment fill station
SCGA	sodium-cooled graphite assembly
SCHE	shutdown cooling heat exchanger
SCHES	shutdown cooling heat exchanger subsystem
SCHS	small-component handling system
SCI	secondary containment isolation
SCIV	secondary containment isolation valve
SCK	Studiecentrum voor Kernenergie (Belgium)
SCM	simulated core mockup	simulated core model	steam condensing mode
SCN	software change notice	specification change notice
SCO	senior control (room) operator
SCOA	sample cave operating area
SCORE	Standing Committee on Regulatory Effectiveness
SCOTTR	supercritical once-through tube reactor
SCP	security control point	site characterization plan
SCPPCS	secondary containment purge and pressure control system
SCR	selenium control rectifier	significant condition report	silicon-controlled rectifier	site characterization report	site characterization review	sodium-cooled reactor	software change request
SCRB	Senior Contract Review Board
SCRD	secondary control rod driveline
SCRDM	secondary control rod drive mechanism
SCRE	shift control room engineer
SCRM	secondary certified reference material
SCRO	senior control room operator
SCRS	secondary control rod system
SCRWC	Sierra Club Radioactive Waste Campaign
SCS	secondary coolant system	shutdown cooling system	sodium characterization system	Soil Conservation Service (U.S. Department of Agriculture)
SCSHX	shutdown cooling system heat exchange	shutdown cooling system heat exchanger
SCSI	Southern Company Services, Inc.
SCSIN	Service Central de Sûrété des Installations Nucléaires (France)
SCSS	Sequence Coding and Search System
SCST	spray chemical storage tank
SCTA	secondary container transfer area
SCTF	slab core test facility	sodium chemical technology facility
SCTI	sodium component test installation
SCTL	small components test loop
SCUMRA	Société Centrale de l’Uranium et des Minéraux et Métaux Radioactifs (France)
SCV	steel containment vessel	systems completion verification
SCVI	special construction verification inspection
SCWE	safety-conscious work environment
SCWHE	shutdown cooling water heat exchanger
SCWR	supercritical water reactor
SCWS	shutdown cooling water subsystem
SD	scram discharge	shakedown	shutdown	standard drawing	standards development	station directive	supply duct	system description
S/D	shutdown
SDA	standard design approval	startup detector assembly	supplier data approval
SDBCS	steam dump bypass control system
SDC	shield design code	shutdown cooling	structural design criterion/criteria
SDCC	small-diameter component cask
SDCS	shutdown cooling system
SDD	system design description
SDEM	Société d’Enterprise de Montages (France)
SDF	spillway design flood
SDG	standby diesel generator
SDGE	San Diego Gas & Electric Co.
SDH	side drill hole
SDHR	shutdown decay heat removal
SDHX	shutdown heat exchanger
SDIP	surveillance dosimetry improvement program
SDLC	synchronous data link control	system development life cycle
SD/LP	shutdown and low power
SDM	shutdown margin
SDMF	surveillance dosimetry measurement facility
SDMP	Site Decommissioning Management Plan
SDOF	single degree of freedom
SDP	setdown pool
SDR	significant deficiency report	SNAP Developmental Reactor	supplier deviation request
SDS	shutdown sequencer	steam dump system	submerged demineralizer system
SDSP	site director standard practice
SDV	scram discharge volume	steam dump valve
SDVIV	scram discharge volume instrument volume
SE	safety evaluation	shift engineer	significant event (NRC performance indicator)	subcritical experiment
SEA	Susquehanna Environmental Advocates
SEAONC	Structural Engineers Association of Northern California
SEAR	safety evaluation audit report
SEAS	Strategic Environmental Assessment Systems
SEASET	separate effects and systems effects test
SECC	Safe Energy Communication Council
SECHT	scoping emergency cooling heat transfer
SECOM	Safe Energy Coalition of Michigan
SECY	Secretary of the Commission, Office of the (NRC)
SEDSS	Sandia Environmental Decision Support System
SEE	INSignificant Event Evaluation and Information Network
SEE-IN	significant event evaluation–information notice
SEEN	Syndicat d’Etudes de l’Energie Nucléaire (Belgium)
SEFOR	Southwest Experimental Fast Oxide Reactor
SEFR	shielding experiment facility reactor
SELNI	Società Elettronucleare Italiana (Italy)
SELO	Società Elettronica Lombarda (Italy)
SEM	scanning electron microscope
SEMO	Société Belgo-Française d’Energie Nucléaire Mosane (Belgium)
SEN	Significant Event Notification (INPO)
SENA	Société d’Energie Nucléaire Franco-Belge des Ardennes (France)
SENN	Società Elettronucleare Nazionale (Italy)
SENTA	Société d’Etudes Nucléaires et de Techniques Avancées (France)
SEO	side entry orifice
SEP	safety enhancement program	site emergency plan	source evaluation panel	standby electric power	Systematic Evaluation Program
SER	safety evaluation report	Sandia Engineering Reactor	self-evaluation report	significant event report	SNAP Experimental Reactor	Staff Evaluation Report
SERB	State Environmental Review Board
SERC	Southeastern Electric Reliability Council
SERF	Sandia Engineering Reactor Facility	special environmental radiometallurgy facility
SERR	semiannual effluent release report
SERS	safety evaluation report supplement
SES	safety evaluation supplement	Senior Executive Service	steam electric station
SET	Special Evaluation Team	systems effects test
SETF	SNAP Experimental Test Facility
SETS	standard environmental technical specification	standardized environmental technical specification
SETU	Société d’Etudes et de Travaux pour l’Uranium (France)
SEUSSN	Southeastern United States Seismic Network
SEWS	Screening Evaluation Work Sheet
SF	source factor	spent fuel
SFA	single-failure analysis/analyses	spent fuel assembly	standard fuel assembly
SFAS	safety features actuation signal
SFBI	spent fuel building isolation
SF&CG	standard format and content guidance
SFCR	storage facility control room
SFCS	secondary flow control system	spent fuel cooling system
SFCSR	storage facility cable spreading room
SFD	severe fuel damage
SFDP	safety functions determination program
SFDST	severe fuel damage scoping test
SFEN	Société Française d’Energie Nucléaire (France)
SFP	spent fuel pit	spent fuel pool
SFPAVS	spent fuel pool area ventilation system
SFPC	spent fuel pool cooling
SFPCCS	spent fuel pool cooling and cleanup system
SFPCS	spent fuel pool cooling system
SFPO	Spent Fuel Project Office (NRC)
SFR	startup field report
SFRCS	steam and feedwater rupture control system
SFRP	Société Française de Radioprotection (France)
SFR&TA	system function review and task analysis
SFS	steam and feedwater system
SFSP	spent fuel storage pool
SFTA	spent fuel transportation accident
SFTT	spent fuel transfer tube
SG	safety guide	steam generator
S/G	steam generator
SGAE	Studiengesellschaft für Atomenergie, m.b.H. (Austria)
SGAHRS	steam generator auxiliary heat removal system
SGAS	steam generator available signal
SGB	steam generator blowdown	steam generator building
SGBD	steam generator blowdown
SGBPS	steam generator blowdown processing system
SGBS	steam generator blowdown system
SGCF	SNAP Generalized Critical Facility
SGD	steam generator dryout
SGDSM	steam generator degradation-specific management
SGE	Société Générale d’Enterprises (France)
SGEF	steam generator examination facility
SGER	safeguards evaluation report
SGFP	steam generator feedwater pump
SGGP	steam generator group project
SGHWR	steam-generating heavy-water reactor
SGI	Safeguards Information	Silicon Graphics International
SGIP	Steam Generator Integrity Program
SGIS	safeguards initiation signal
SGLIC	steam generator level instrumentation cabinet
SGML	standard generalized markup language
SGMSR	steam generator maximum steam rate
SGN	Société de Génie Nucléaire (France)
SGOG	Steam Generators Owners Group
SGR	self-generation reactor	sodium-graphite reactor
SGS	Salem Generating Station	segmented gamma scanner	steam generator subsystem	steam generator system	subgrid scale
S/GS	steam generator system
SGSA	steam generator subassembly
SGTF	steam generator test facility
SGTIP	Steam Generator Tube Integrity Program
SGTR	steam generator test rig	steam generator tube rupture
SGTS	standby gas treatment system
SGV	steam generator vessel
SGWLC	steam generator water level control
SHA	sodium hydroxide addition	solid homogeneous assembly
SHAA	sealed head access area
SHADE	shielded hot-air drum evaporator
SHARE	systems for heat and radiation energy
SHE	semihomogeneous experiment	standard hydrogen electrode
SHEAC	Safety, Health, and Environmental Appraisal Committee
SHEEC	Shearon Harris Energy and Environmental Center
SHF	storage-handling facility
SHI	Sumitomo Heavy Industries Ltd. (Japan)
SHMED	State Hazardous Materials Enforcement Development
S/HNP	Skagit/Hanford Nuclear Project
SHNPP	Shearon Harris Nuclear Power Plant
SHPO	State Historic Preservation Officer
SHRS	shutdown heat removal system
SHTL	small heat-transfer loop
SI	safety injection	security inspector	special instruction	surveillance inspection	surveillance instruction	système international (d’unités) (International System of Units)
SIAS	safety injection actuation signal
SIC	standard industrial classification	Standard Industrial Code
SICN	Société Industrielle de Combustible Nucléaire (France)
SICS	safety injection control system
SID	sodium ionization detector
SI/EB	safety injection/emergency boration
SIG	special inquiry group
SIGEN	Società Impianti Generazione Energia Nucleare, SpA (Italy)
SIHP	Sargent Industries, Huntington Park
SIL	service information letter
SIM	service information memorandum/memoranda
SIMEA	Società Italiana Meridionale Energia Atomica (Italy)
SIMS	safety issues management system
SIN	Schweizerisches Institut für Nuklearforschung (Switzerland)
SINB	Southern Interstate Nuclear Board
SINET	Shared Information Network
SIO	Società per l’Industria dell’Ossigeno e de Altri Gas (Italy)
SIPAO	simulator for postaccident operation
SIPI	Scientists Institute for Public Information
SIR	safeguards implementation report	safe integral reactor	safety issue resolution	self-initiated review	submarine intermediate reactor
SIRMO	senior information resource management official
SIRW	safety injection and refueling water
SIRWT	safety injection and refueling water tank
SIS	safety injection signal	safety injection system	site integrated schedule	Special Inspection Services
SISBO	self-induced station blackout
SISI	surveillance and inservice inspection
SIT	safety injection tank	safety injection transmitter	social implications of technology	structural integrity test
SITP	site inspection and test procedure
SJAE	steam jet-air ejector
SJWCP	skid jacket water cooling pump
SKA	Studienkommission für Atomenergie (Switzerland)
SKI	Swedish Nuclear Power Inspectorate
SL	safety limit	section leader	stationary low
S&L	Sargent & Lundy Engineers
SLAC	Stanford Linear Accelerator Center
SLB	status light box	steamline break
SLC	standby liquid control	State liaison coordinator
SLCRS	supplemental leakage collection and release system	supplementary leak collection and release system
SLCS	standby liquid control system
SLD	shutdown logic diagram
SLF	seismic load factor
SLI	steamline isolation
SLIP	serial line Internet protocol
SLIV	steamline isolation valve
SLMCPR	safety limit for minimum critical power
SLO	single-loop operation	State liaison officer
SLP	St. Lucie Plant
SLPS	State and local program support
SLSF	sodium-loop safety facility
SLTC	seismic loading for temporary condition
SLSV	shutdown-loop shutoff valve
SLUC	standard level user charge
SLWMS	secondary liquid waste management system
SM	shift manager	stationary medium
SMA	shielded metal arc
SMACNA	Sheet Metal and Air Conditioning Contractors’ National Association
SMART	senior management assessment of readiness team
SMAW	shielded metal arc weld	shielded metal arc welding	submerged metal arc welding
SMBDB	structural margin beyond design basis
SMC	segmented maintenance cask	seismic methodology chain	systems, man, and cybernetics
SMM	seismic margins method	senior management meeting	subcooling margin monitor
SMP	simulator modification package
SMR	shield mockup reactor	solid moderated reactor	system modification request
SMSA	standard metropolitan statistical area
SMTI	sodium mechanisms test installation
SMTP	simple mail transfer protocol
SMUD	Sacramento Municipal Utility District
S/N	serial number
SNAME	Society of Naval Architects and Marine Engineers
SNAP	safeguards network analysis procedure	shielded neutron assay probe	Struthers Nuclear and Process Co.	systems for nuclear auxiliary power
SNC	Sierra Nuclear Corp.
SNE	Sociedad Nuclear Española (Spain)
SNEC	Saxton Nuclear Experimental Corp.	subgroup on nuclear export coordination
SNERP	Saxton Nuclear Experimental Reactor Project
SNG	synthetic natural gas
SNGS	Salem Nuclear Generating Station
SNI	Società Nucleare Italiana (Italy)
SNL	Sandia National Laboratories
SNM	Society for Nuclear Medicine	special nuclear material
SNOC	Southern Nuclear Operating Company
SNP	Sequoyah Nuclear Power Plant	Skagit Nuclear Power Project
SNPS	Seabrook Nuclear Power Station	Shoreham Nuclear Power Station
SNR	slow neutron reactor	supplier nonconformance report
SNRC	Soreq Nuclear Research Center
SNS	Seabrook Nuclear Station	spallation neutron source
SNUPPS	standardized nuclear unit power plant system
SO	Siemens Österreich (Austria)	status officer	supervising operator
SOA	statement of account
SOC	Statements of Consideration
SOCCS	summary of component control status
SOCIA	Société pour l’Industrie Atomique (France)
SOD	shallow outside diameter	Société d’Etudes pour l’Obtention du Deuterium (France)
SODERN	Société d’Etudes et Réalisations Nucléaires (France)
SOE	sequence of events
SOER	safety operational event report	significant operating event report	significant operating experience report
SOICS	summary of installation control status
SOL	senior operator license
SOM	shift operations manager
SONGS	San Onofre Nuclear Generating Station
SONOPCO	Southern Nuclear Operating Company
SOP	standard operating procedure	stepoff pad	Supervisory Orientation Program
SOPI	system operational performance inspection
SOPR	Spanish Open Pool Reactor
SOPREN	Società Progettazione Reattori Nucleari, SpA (Italy)
SOR	static O-ring	system of records
SORC	station operations review committee
SORIN	Società Ricerche Impianti Nucleari (Italy)
SORV	stuck-open relief valve
SORX	Security Organization Response Exercise
SOS	shift operations supervisor
SOV	solenoid-operated valve
SOW	statement of work
SP	sampling point	security procedure	set point	special project	special purpose	suppression pool	surveillance procedure
SPACS	sodium purification and characterization system
SPAHR	simulation package for assessing health risks
SPAR	simplified plant analysis risk
SPB	Security Policy Board
SPC	Siemens Power Corporation (formerly Exxon Nuclear)	standby pressure control	stored program controller	suppression pool cooling
SPCED	system for physical control of energy distribution
SPCP	statistical process control program
SPCU	suppression pool cleanup
SPDES	State Pollutant Discharge Elimination System
SPDS	safety parameter display system
SPEEDI	system for prediction of environmental emergency dose information
SPER	Security Plan Evaluation Report
SPERT	special power excursion reactor test
SPES	Simulatore per Esperienze di Sicurezza (Italy) [Simulator for Safety Experimental Analysis]	Simuluzione PWR per Esperienze di Sicurezza (Italy)
SPF	site population factor	standard project flood
SPGD	self-powered gamma detector
SP/HD	spool piece head
SPI	site population index
SPIAM	sodium purity in-line analytical module
SPIN	Società per Imprese Nucleare, SpA (Italy)
SPIP	Safety and Performance Improvement Program
SPMC	Seabrook Plan for the Massachusetts Communities
SPMS	suppression pool makeup system
SPND	self-powered neutron detector
SPOC	system preoperability checklist
SPOUT	system peripheral output utility
SPR	Sandia Pulsed Reactor
SPRF	Sandia Pulsed Reactor Facility
SPS	safety protection subsystem	secondary plant system	standard project storm	Summit Power Station	supplementary protection system	Surry Power Station
SPSC	Southwestern Public Service Co.
SP/SC	shield plug/support cylinder
SPSS	shield plug storage station
SPT	satellite pulse technique	special purpose test	standard penetration test
SPTF	sodium pump test facility
SPV	storage process vent
SPVC	simulated pressure vessel capsule
SPVR	storage process vent room
SPX	superheat power experiment
SQR	seismic qualification report	supplier quality representative
SQRS	seismic qualification review summary
SQRT	seismic qualification review team
SQUG	Seismic Qualification User’s Group	Seismic Qualification Utility Group
SR	safety related	safety rod	source range	summary report	support reaction	surveillance requirement
S/R	safety relief	shipper-receiver
SRA	senior resident analyst
SRB	safety review board
SRBT	single-rod burst test
SRC	Science Research Council (United Kingdom)	shutdown reactor cooling	spares receiving checklist
SRCAS	safety-related control air system
SRCC	safety-related control circuit
SRCI	safety-related control and instrumentation
SRD	self-reading dosimeter	shipper-receiver difference
SR&D	sodium removal and decontamination
SRDA	sodium removal development apparatus
SRDC	safety-related design condition
SRDI	safety-related display instrumentation
SRE	safety-related equipment	sodium reactor experiment
SREC	standard radiological effluent control
SRFM	source range flux monitor	source range flux monitoring
SRGS	St. Rosalie Generating Station
SRH	switchyard relay house
SRHC	shutdown reactor head cooling
SRI	senior resident inspector	Stanford Research Institute
SRIAER	Scientific Research Institute for Atomic Energy Reactors (U.S.S.R.)
SRIC	senior resident inspector for construction
SRL	Savannah River Laboratory
SRM	source range monitor	staff requirements memorandum/memoranda	standard reference material	startup range monitor
SRN	specification revision notice
SRO	senior reactor operator	specification release order
SROA	safety-related operator action
SROS	send/receive from the opposite side
SRP	Savannah River Plant	small radioactive particle	small rotating plug	Standard Review Plan
SRP-LR	standard review plan–license renewal
SRRC	Standing Results Review Committee
SRS	sodium removal station	sodium removal system	solid radwaste system
SRSS	send/receive from the same side	square root of the sum of the squares
SRST	spent resin storage tank
SRT	special review team	spent resin tank
SRTI	Société de Recherches Techniques et Industrielles (France)
SRU	Société de Raffinage d’Uranium (France)
SRV	safety/relief valve
S/RV	safety/relief valve
SRVDL	safety/relief valve discharge line
S/RVDL	safety/relief valve discharge line
SRVL	safety-related vendor list
SRVO	safety relief valve open
SR/VO	safety relief valve open
SRWS	solid radioactive waste system
SS	safe shutdown	sample sink	sample station	sampling system	shift supervisor	site safety	site suitability	Southern Services, Inc.	special source	speed sensor	stainless steel	Susquehanna Station	systems specialist
SSA	safety system actuation (NRC performance indicator)
SSAB	site-specific advisory board
SSAR	site safety analysis report	standard safety analysis report
SSAS	small sample assay system
SSAT	safety significance assessment team
SSB	Source Selection Board	Strategic Steering Board
SSC	short segmented cask	simulated surveillance capsule	Southern Services Company	structure, system, and component	super system code
SSCA	spray system compressed air
SSCC	Solid-State Circuits Council
SSCCS	solid-state component control system
SSCR	spectral shift control reactor
SS&D	sealed source & device
SSDR	Sealed Source and Device Nationwide Registry
SSE	safe-shutdown earthquake
SSEB	Southern States Energy Board	South of Scotland Electricity Board
SSEI	Safety System Engineering Inspection
SSER	site safety evaluation report	supplemental safety evaluation report	supplement to safety evaluation report
SSES	Susquehanna Steam Electric Station
SSF	safe-shutdown facility	safety system failure (NRC performance indicator)	service storage facility	standby shutdown facility
SSFI	safety systems functional inspection
SSI	safe-shutdown impoundment	soil-structure interaction	steady-state irradiation
SSK	Strahlenschutzkommission (Germany)
SSLPS	solid-state logic protection system
SSMRP	seismic safety margins research program
SSNM	strategic special nuclear material
SSNPP	small-size nuclear power plant
SSO	System Security Officer
SSOMI	safety systems outage modification inspection
SSORA	security system operational recording and analysis/analyses
SSP	sodium sampling package	staff site position	static sodium pot
SSPB	Swedish State Power Board
SSPC	Steel Structure Painting Council
SSPI	safety system performance indicator
SSPM	safety system performance monitor
SSPS	solid-state protection system
SSPWR	small-size pressurized-water reactor
SSQE	safety system quality evaluation
SSR	seal steam regulator	secondary system relief	separate superheater reactor	site suitability report	site suitability review	specification status report
SSRAP	Senior Seismic Review and Advisory Panel
SSRCR	suggested State regulations for the control of radiation
SSRM	safety system readiness monitor
SSRT	slow strain rate test
SSS	safe-shutdown system	secondary sampling system	sensitized stainless steel	shield and seismic support	shift support supervisor	special safeguards study	special safety safeguard	standby shutdown system
SSST	site suitability source term
SST	secondary surge tank	siting source term	station service transformer
SS/T	steady-state/transient
SSTP	Super SARA Test Program
SSTR	solid-state track recorder
SSW	salt service water	standby service water
SSWP	station service water pump
SSWS	standby service water system	station service water system
ST	site team	source term	special test	speed transmitter
STA	Science and Technology Agency (Japan)	shift technical advisor
STAR	Sandia National Laboratories Transient Axial Relocation	shield test air reactor	space thermionic auxiliary reactor
STC	sound transmission coefficient
STCL	source-term control loop
STCP	source-term code package
STE	shield test experiment	shift technical engineer	special test exception	system test engineer
ST&E	security test and evaluation
STEC	South Texas Electric Cooperative, Inc.
STEP	safety test engineering program	source-term experiments project
STF	safety test facility	shield test facility	shielded test facility
STH	simplified time history
STI	special team inspection	surveillance test interval
STIF	short-term irradiation facility
STIR	shield test and irradiation reactor	special technical issue report
STL	site team leader
STP	short-term program	shutdown transfer panel	South Texas Project	special technical publication	staff technical position	standard temperature and pressure	surveillance test procedure	system test procedure
STPF	shield test pool facility
STPM	simulated thermal power monitor
STR	submarine thermal reactor
STRESS	structural engineering system solver
STRIDE	standard reactor island design
STS	Standard Technical Specification
STV	small test vessel
S/U	startup
SUNY	State University of New York
SUPO	super power
SUPS	static uninterruptible power supply
SUR	startup rate
SUS	startup system
SU/SD	startup and shutdown
SUT	startup transformer
SV	safety valve
Sv	sievert
SV	solenoid valve	stop valve
SVA	single-valve first-actuation
SVBC	simulated void box capsule
SVHHC	St. Vincent Hospital and Health Center
SW	service water	Struthers Wells Corp.
S&W	Stone and Webster Engineering Corp.
SWA	startup work authorization
SWBP	sidewall bearing pressure
SWBS	solid waste barrel storage
SWC	solid waste cask
SWCP	secondary water chemistry program
SWCS	salt water cooling system
SWDS	steam and water dump system
SWEC	Stone and Webster Engineering Corp.
SWESSAR	Stone and Webster Standard Safety Analysis Report
SWET	simulated water entry test
SWGR	switchgear
SWGTS	steam and waste gas treatment system
SWIS	service water intake structure
SWISS	sustained water interactions with stainless steel
SWM	Serber-Wilson method
SWMS	solid waste management system
SWO	stop-work order
SWP	service water pump	solid waste packaging	solid waste processing	special work permit
SWPP	Southwest Power Pool
SWPS	solid waste processing system
SWR	service water reservoir	sodium-water reaction	submarine water reactor
SwRI	Southwest Research Institute
SWRPRS	sodium-water reaction pressure relief subsystem
SWS	service water system	solid waste system
SWSR	solid waste shipping room
SWTS	secondary waste treatment system
SWU	separate work unit	separative work unit
SX	solvent extraction
SXF	solvent extraction feed
SYCA	Syndicat d’Etude des Centrales Atomiques (Belgium)
SYRFA	Société de Système Française pour les Réacteurs Avancées (France)
SZW	Ministry of Social Affairs and Employment (Netherlands)
TA	Technical Associates	transfer aisle
T&A	time and attendance
TAAG	technical assessment and advisory group
TAC	task action commitment	technical assignment control	technical assistance contract
TACF	temporary alteration control form
TACS	technical assignment control system	test assembly conditioning station
TADOT	trip actuating device operational test
TAEC	Thailand Atomic Energy Commission
TAF	top of active fuel
TAG	technical advisory group	test assembly grapple
TAIC	Tokyo Atomic Industrial Consortium
TAL	transporter air lock
TAML	Taunton Municipal Lighting Plant	technical assistance management letter
TAP	task action plan	test analysis package	thermal analyzer program
TAPD	test and analysis program description
TAPM	technical assistance project manager
TAPMG	technical assistance program management group
TAPSS	technical assistance programs support system
TAR	technical assistance request	test analysis report
TARGET	thermal advanced gas-cooled reactor exploiting thorium
TASC	Technical Activity Steering Committee
TAUF	test assembly unloading fixture
TAVS	turbine area ventilation system
TAWC	Tennessee-American Water Co.
TB	total body	turbine building
TB&A	Theodore Barry and Associates
TBCCW	turbine building closed cooling water
TBD	to be determined
TBEA	training benefits and employee assistance
TBESI	turbine building exhaust system isolation
TBM	tunnel-boring machine
TBP	tributyl phosphate
TBS	turbine bypass system
TBSCCW	turbine building secondary closed cooling water
TBSW	turbine building service water
TBV	turbine block valve	turbine building ventilation
TBYMS	Technical Bases for Yucca Mountain Standards
TC	temperature controller	transfer canal
T/C	thermocouple
TCA	thermal critical assembly
TCC	Transducer Controls Corporation
TCCC	time current characteristic curve
TC/LD	thermocouple/lead detector
TCM	technical committee meeting
TCP/IP	transmission control protocol/Internet protocol
TCS	telephone conference summary	temporary conditioning station	turbine control system
TCV	temperature control valve	turbine control valve
TD	theoretical density	time delay	transfer dolly	turbine driven
TDAFP	turbine-driven auxiliary feed pump
TDAFW	turbine-driven auxiliary feedwater
TDAFWP	turbine-driven auxiliary feedwater pump
TDC	thermal diffusion coefficient
TDCR	test deficiency change request
TDD	test design description
TDEFWP	turbine-driven emergency feedwater pump
TDF	task deletion form	thermal design flow
TDH	Texas Department of Health	total developed head	total dynamic head
TDI	Transamerica Delaval, Inc.	turbine disk integrity
TDIOG	Transamerica DeLaval, Inc., Owners Group
TDM	time division multiplex
TDMC	Technical Data Management Center (Oak Ridge National Laboratory)
TDN	technology development need
TDP	turbine-driven pump
TDR	technical data report	test deficiency report	time domain reflectometry
TDS	time delay switch	total dissolved solids
TE	temperature element	test exception	thermal expansion	transient event
T/E	thermoelectric
TEAR	training evaluation audit report
TEC	Technology for Energy Corp.	total estimated cost
TECHNICATOME	Société Technique pour l’Energie Atomique (France)
TECO	Toledo Edison Company
TECRO	Taipei Economic and Cultural Representative Office (Taiwan)
TEDE	total effective dose equivalent
TEFC	totally enclosed fan cooled
TEG	thermoelectric generator
TEM	transmission electron microscope
TEMA	Tubular Exchanger Manufacturers Association
TEMAC	Top Event Matrix Analysis Code
TENR	technologically enhanced naturally radioactive
TENRAP	technologically enhanced naturally radioactive product
TEP	Tyrone Energy Park
TER	technical evaluation report	technical exchange report
TES	Teledyne Engineering Services
TFANP	Task Force Against Nuclear Pollution
TFC	thermal fatigue crack
TFE	thermionic fuel element	thin film evaporator
TFM	Treasury Financial Manual
TFS	turbine first stage
TFTR	tokamak fusion test reactor
TG	turbine generator
T/G	turbine generator
TGB	turbine generator building
TGEP	turbine generator emergency power
TGIS	toxic gas isolation system
TGLM	task group lung model
TGS	turbine generator system
TGSCC	transgranular stress-corrosion cracking
TGSS	turbine gland sealing system
TGV	turbine governor valve
T/H	thermal and hydraulic
THCS	temperature of hot-channel sodium
THERP	technique for human error rate prediction
THL	top of heated length
THM	time history model
THPO	Tribal Historic Preservation Officer
THTF	thermal hydraulic test facility
THTR	thorium high-temperature reactor
TI	temperature indicator	temporary instruction	test instruction	transport index
TIA	task interface agreement
TIBB	Tecnomasio Italiano Brown Boveri, SpA (Italy)
TIC	Technical Information Center	temperature-indicating controller
TID	Technical Information Document	technical report designation for the U.S. Atomic Energy Commission	total integrated dose
TIF	task initiation force	task initiation form
TIG	tungsten inert gas
TIP	tactical improvement package	transient in-core probe	traveling in-core probe	traversing in-core probe
TIRGALEX	Technical Integration Review Group for Aging and Life Extension
TIS	temperature-indicating switch
TL	task leader	test load	truck lock
TLA	thin layer activation
TLAA	time-limited aging analysis
TLD	thermoluminescence dosimeter
TLEC	Texas-Louisiana Electric Cooperative
TLLM	temperature and liquid level monitor
TLO	turbine lube oil
TLOFW	total loss of feedwater
TLOS	turbine lube oil system
TLOST	turbine lube oil storage tank
TLP	top load pad	top load plane
TLTA	two-loop test apparatus
TLTM	third-level thermal margin
TLV	threshhold limit value
TM	technical manual	temperature monitor
TMBDB	thermal margin beyond design basis
TMD	transient mass distribution
TMH	trolley-mounted hoist
TMI	Three Mile Island
TMI-1	Three Mile Island Unit 1
TMI-2	Three Mile Island Unit 2
TMIA	Three Mile Island Alert, Inc.
TMI-AP	Three Mile Island Action Plan
TMINS	Three Mile Island Nuclear Station
TMIPO	Three Mile Island Program Office
TM/LP	thermal margin/low pressure
TMPA	Texas Municipal Power Agency
TMR	Teledyne Materials Research
TNA	thermal neutron activation
TNE	TUEC (Texas Utilities Electric Co.) nuclear engineering
TNP	Trojan Nuclear Plant
TNPG	The Nuclear Power Group (United Kingdom)
TNT	trinitrotoluene
TOED	Toledo Edison Co.
TOL	temporary operating license	thermal overload
TOP	thermal overload protection	transient overpower
TOPO	trioctylphosphine oxide
TOPR	Taiwan Open-Pool Reactor
TOS	torque overload switch
TOSS	transient and/or steady state
TP	technical position	test pressure	test procedure	test program
TPA	total-system performance assessment
TP-BAR	tritium-producing burnable absorber rod
TPC	Taiwan Power Company
TPCDF	total plant core damage frequency
TPD	test procedure deviation
TPF	total peaking factor
TPFL	two-phase flow loop
TPM	thermal power monitor
TPPEP	Turkey Point Performance Enforcement Program
TPS	Turkey Point Station
TPSS	turbine plant sampling system
TPTF	two-phase test facility
TQM	total quality management
T&QP	Training and Qualification Plan
TR	technical review	temperature recorder	topical report	tritium recovery	Turkish Reactor
TRA	tubular reactor assembly
TRAP	trip reduction and assessment program (WOG)
TRB	test review board
TRC	technical review committee	The Radiochemical Centre (United Kingdom)
TRE	total rare earths
TREAT	transient reactor test
TRIA	temperature-removable instrument assembly
TRIGA	training reactor and isotopes production, General Atomics
TRIM	targeted regulatory improvement
TRIP	transient response implementing procedure
TRM	Technical Requirements Manual
TRR	test and research reactor	Thailand Research Reactor
TRRT	test results review team
TRS	thermal reactor safety
TRT	technical review team
TRTR	training, research, and test reactor
TRU	transuranic	transuranium
TRUWIP	Transuranic Waste Immobilization Program
TRX	two-region physics critical experiment
TS	technical specification	test specification	treatment system
TSA	tube support assembly
TSABC	technical services as-built coordinator
TSAR	topical safety analysis report
TSC	technical support center	test shipping cask
TSCA	Toxic Substances Control Act
TSCC	Technical Support Coordinating Committee
TSCF	task schedule change form
TSDR	technical services design review
TSF	tower shield facility	tower shielding facility
TSG	technical support guidelines
TSH	temperature switch, high
TSI	Thermal Sciences Inc.
TSIP	Technical Specifications Improvement Program
TSIR	technical specifications interpretation report
TSM	temporary station modification
TSMD	technical services mechanical drafting
TSMDA	test section meltdown accident
TSO	time-sharing option
TSOP	Technical Specifications Optimization Program
TSP	Telecommunications Service Priority	trisodium phosphate	tube support plate
TSPA-VA	total system performance assessment-viability assessment
TSPM	technical surveillance countermeasure
TSPS	tube support plate sleeve
TSR	thermal shock rig	total stress range	tower shielding reactor
TSRG	Technical Specifications Review Group
TSSC	Toxic Substances Strategy Committee
TSV	turbine stop valve
TSW	turbine service water
TT	temperature transmitter	test temperature	turbine trip
TTA	thenyltrifluoroacetone
TTBT	Threshold Test Ban Treaty
TTC	Technical Training Center	test transfer cask	Transportation Technology Center
TTE	thermal transient equipment
TTF	transient time flowmeter
TTFM	transit time flowmeter
TTHE	thermal transient histogram equivalent
TTP	technology transfer program	test transfer port
TTQAP	teletherapy treatment quality assurance program
TTR	thermal test reactor	time to repair
TTS	telecommunications tracking system	time-temperature sensitization
TTV	tenth thickness value
TTWB	turbine trip with bypass
TTY	teletypewriter
TU	Texas Utilities Co.
TUEC	Texas Utilities Electric Co.
TUFCDF	Thorium-Uranium Fuel Cycle Development Facility
TUS	Texas Utilities Services Inc.
TUSI	Texas Utilities Services Inc.
TUV	Technischer Überwachungsverein, e.V. (Germany)
TVA	Tennessee Valley Authority
TVG	time-variable gain
TVO	Teollisuuden Voima Osakeyhtio (Finland)
TVR	Tennessee Valley region
TWC	Texas Water Commission
TWCA	Teledyne Wah Chang Albany
TWFN	Two White Flint North
TWG	test working group
TWRS	tank waste remediation system
TWX	teletypewriter exchange service
TZM	tantalum, zirconium, molybdenum
UAP	uranyl ammonium phosphate
UAT	unit auxiliary transformer
UBAEC	Union of Burma Atomic Energy Centre
UBC	Uniform Building Code
UCL	upper control limit
UCLA	University of California, Los Angeles
UCLR	University of California, Lawrence Radiation Laboratory
UCNI	unclassified controlled nuclear information
UCO	uranium oxicarbide fuel
UCS	Union of Concerned Scientists
UDI	Utility Data Institute
UDRPS	ultrasonic data recording and processing system
UDS	ultimate damage state
UDT	underwater demolition team
UE	Union Electric Co.
UEC	United Engineers and Constructors, Inc.
UE&C	United Engineers and Constructors, Inc.
UEF	upper end fitting
UEL	upper electrical limit
UF	urea-formaldehyde
UFCS	uranium hexafluoride chemical feed station
UFFC	ultrasonic ferroelectrics and frequency control
UFL	upper flammability limit
UFM	unified fracture mechanics
UFR	uranium hexafluoride recovery room
UFSAR	updated final safety analysis report
UFTR	University of Florida Teaching Reactor
UGS	upper group stop	upper guide structure
UHF	ultrahigh frequency
UHI	upper-head injection
UHN	uranyl hexahydrate nitrate
UHS	ultimate heat sink	ultrahigh speed
UHTREX	ultrahigh temperature reactor experiment
UHV	ultrahigh voltage
UI	United Illuminating Co.
UIS	upper internals structure
UISJM	upper internals structure jacking mechanism
U.K.	United Kingdom
UKAEA	United Kingdom Atomic Energy Authority
UKNR	University of Kansas Nuclear Reactor
UL	Underwriters Laboratories, Inc.	upper level
ULD	unit load demand
UMRR	University of Missouri Research Reactor
UMTR	University of Maryland Teaching Reactor
UMTRA	uranium mill tailings remedial action
UMTRAP	Uranium Mill Tailings Remedial Action Program
UMTRCA	Uranium Mill Tailings Radiation Control Act
UN	uranyl nitrate
UNC	United Nuclear Corp.
UND	uranyl nitrate distillate
UNE	Union Electric Co.
UNH	uranyl nitrate hexahydrate
UNHC	uranyl nitrate hexahydrate cell
UNI	United Nuclear Industries, Inc.
UNIPEDE	International Union of Producers and Distributors of Electrical Energy
UNIT	United Illuminating Co.
UNPOC	Utility Nuclear Power Oversight Committee
UNSCEAR	United Nations Scientific Committee on the Effects of Atomic Radiation
UNWMG	Utility Nuclear Waste Management Group
UO	unit operator
UOGF	uranium off-gas filter
UOP	unit operating procedure
UOR	upper oil reservoir
UPI	upper plenum injection
UPL	uranium product loadout	Utah Power & Light Co.
UPM	universal permissive module
UPPS	ultimate plant protection system
UPR	uranium production reactor
UPS	uninterrupted power supply	uninterruptible power supply	uninterruptible power system
UPTF	Upper Plenum Test Facility (Germany)
UPTPS	upper plenum thermal protection structure
UR	user requirement
URA	Universities Research Association	uranium recycle acid
URAEP	University of Rochester Atomic Energy Project
URC	ultrasonic resin cleaner
URD	underground residential distribution	Utility Requirements Document
URFO	uranium recovery field office	uranium recovery field officer
URG	unit review group
URI	unresolved item
URL	Uniform Resource Locator
URTC	Ukrainian Radiation Training Center
USA	upper-shelf analysis/analyses
USAEC	U.S. Atomic Energy Commission
USAR	updated safety analysis report
USAS	United States of America Standards
USASI	United States of America Standards Institute
USBR	U.S. Bureau of Reclamation
U.S.C.	U.S. Code
USCEA	U.S. Council for Energy Awareness (now NEI)
USCG	U.S. Coast Guard	Utility Safety Classification Group
USC&GS	U.S. Coast and Geodetic Survey
USDA	U.S. Department of Agriculture
USE	upper-shelf energy
USEC	U.S. Enrichment Corporation
USGS	U.S. Geological Survey
USI	unresolved safety issue
USNDC	U.S. Nuclear Data Committee
USNRC	U.S. Nuclear Regulatory Commission
USP	upper sequential permissive
USPHS	U.S. Public Health Service
USQ	unreviewed safety question
USQD	unresolved safety question determination
USRP	updated standard review plan
UST	United States Testing Co.
USWB	U.S. Weather Bureau
UT	ultrasonic test	ultrasonic testing	universal time
U/Th	uranium-to-thorium ratio
UT/ISI	ultrasonic inservice inspection
UTM	universal transverse Mercator
UTP	upper tie plate
UTR	university training reactor
UTRR	University of Teheran Research Reactor
UTS	upper tube sheet
UU	ultimate user
UUCP	Unix-to-Unix copy program
UV	undervoltage
UVAR	University of Virginia Reactor
UVR	undervoltage relay	University of Virginia Reactor
UVSC	uranium ventilation scrubber cell
UVTA	undervoltage trip attachment
UWRR	University of Wyoming Research Reactor
UWTR	University of Washington Training Reactor
UXO	unexploded ordnance
UZ	unsaturated zone
v%	volume percent
VA	viability assessment	vital area
Vac	volts alternating current
VAK	Versuchsatomkraftwerk Kahl (Germany)
VAN	value-added network
VANS	vehicular alert and notification system
VAR	volt amperes reactive
VAT	Vulnerability Assessment Team
VBMR	ventilation barrier machine room
VBWR	Vallecitos Boiling Water Reactor
VC	vaporizer concentrate
VCC	ventilated concrete cask
VCD	vendor-certified drawing
VCLF	vertical cask-lifting fixture
VCM	vinyl chloride monomer
VCT	volume control tank
VDA	video graphics adapter
VDC	ventilation duct chase
Vdc	volts direct current
VDEW	Vereinigung Deutscher Elektrizitätswerke (Germany)
VD/OS	vacuum distillation/overflow sampler
VDS	vacuum defueling system
VDTUV	Vereinigung der Technischen Überwachungs-Vereine, e.V. (Germany)
VE	Vitro Engineering
VEC	vertical electrical chase
VEPCO	Virginia Electric and Power Co.
VESIAC	Vela Seismic Information and Analysis Center
VESR	Vallecitos Experimental Superheat Reactor
VF	vaporizer feed
VFTP	ventilation filter testing program
VGCH	vent gas collection header
VGES	variable geometry experimental system
VHES	Vitro Hanford Engineering Service
VHF	very high frequency
VHP	vessel head penetration
VHPT	variable high-power trip
VHTR	very high temperature reactor
VI	vent isolation
VIA	value-impact analysis/analyses
VIMS	Virginia Institute of Marine Science
VIRG	Vessel Integrity Review Group
VISA	vessel integrity simulation analysis
VIV	variable inlet vane
VNSP	vacant nozzle shield plug
VOG	vessel off-gas
VOT	valve opening time
VOTA	vibration open test assembly
VOTES	valve operation test and evaluation system
VP	Alvin W. Vogtle, Jr., Plant – Vogtle Electric Generating Plant	vent-clearing pressure
VPI	vapor phase inhibitor
VQAR	vendor quality assurance representative
VR	volume reduction
VRS	vacuum relief system	volume reduction system
VS	vapor suppression	vendor specific	vessel system	virtual storage
VSC	ventilated storage cask
VSE	vessel steam explosion
VSLO	valve stem leakoff
VSNS	Virgil C. Summer Nuclear Station
VSR	Vallecitos Superheat Reactor	vertical slice review
VSS	vessel support subsystem
VST	valve set point tolerance
VT	vehicular technology
VTEC	Vermont Electric Cooperative, Inc.
VTEP	Vermont Electric Power Co., Inc.
VTO	vital to operations
VTT	Valtion Teknillinen Tutkimuskeskus (Finland)
V&V	verification and validation
VWAC	visual weld acceptance criterion/criteria
VWE	vanadium wire equilibration
VWED	vanadium wire equilibration device
VWI	visual weld inspection	visual weld inspector
VWO	valve wide open
VYGS	Vermont Yankee Generating Station
VYNP	Vermont Yankee Nuclear Power Corp.
W	Westinghouse Electric Corp.
w%	weight percent
WAGR	Windscale Advanced Gas-Cooled Reactor (United Kingdom)
W-AL	Westinghouse-Astronuclear Laboratory
WAMS	Work Action Management System
WAN	wide-area network
WANO	World Association of Nuclear Operators
WAPA	wet annular poison assembly
WAPD	Westinghouse Atomic Power Division
WAPPA	waste package performance assessment
W-ARD	Westinghouse Advanced Reactors Division
WASI	workforce analysis, systems, and information
WB	whole body
WBEP	Watts Bar Engineering Project
WBNP	Watts Bar Nuclear Plant
WBNPP	Watts Bar Nuclear Performance Plan
WBNS	water-boiler neutron source
WBPP	Watts Bar Program Plan
WBPT	Watts Bar Program Team
WBS	work breakdown structure
WC	weather condition
WCA	whole-core accident
WCAP	Westinghouse commercial atomic power
WCF	waste-calcinating facility
WCFO	Walnut Creek Field Office
WCGS	Wolf Creek Generating Station
WCL	Westinghouse Canada Limited
WCNOC	Wolf Creek Nuclear Operating Corp.
WCS	waste compaction station
WD	waste disposal	withdrawn
WDC	waste disposal cask	weld data card
WDS	waste disposal system
WDTRS	Westinghouse development test requirement specification
WEC	Westinghouse Electric Corporation	Wolverine Electric Cooperative
WECAN	Westinghouse Electric computer analysis/analyses
WECST	waste evaporator condensate storage tank
WECT	waste evaporator condensate tank
WEP	water-extended polyester	weld evaluation project
WEPC	Wisconsin Electric Power Co.
WEPCO	Wisconsin Electric Power Co.
WESF	waste encapsulation storage facility
WESI	Westinghouse Energy Systems International (formerly WNI Nuclear)
WESPAC	Westchester People’s Action Coalition
WFMC	welding filler material control
WFML	weld filler metal log
WG	waste gas	water gauge
WGC	waste gas compressor
WGDS	waste gas disposal system
WGDT	waste gas decay tank
WGIS	waste containment and isolation strategy
WGS	waste gas system	Waterford Generating Station
WHC	Westinghouse Hanford Company
WHEDL	Westinghouse-Hanford Environmental Development Laboratory
WHO	World Health Organization
WHT	waste holdup tank
WIEB	Western Interstate Energy Board
WIEP	Wisconsin Electric Power Co.
WINB	Western Interstate Nuclear Board
WIPP	waste isolation pilot plant
WIR	weekly information report
WISE	World Information Service on Energy
WISHA	Washington Industrial Safety and Health Act
WISP	workload information and scheduling program
WITS	work item tracking system
WLM	working-level month
WMEC	Western Massachusetts Electric Co.
WMM	wall-mounted manipulator
WMNS	William B. McGuire Nuclear Station
WMO	World Meteorological Organization
WMPC	Wisconsin Michigan Power Co.
WMS	waste management system	work management system
WMT	waste management tank
WNES	Westinghouse nuclear energy system
WNFM	World Nuclear Fuel Market
WNP	Washington Nuclear Project
WNT	waste neutralization tank	waste neutralizing tank
WNYNRC	Western New York Nuclear Research Center
WO	work order
WOFA	Westinghouse optimized fuel assembly
WOG	Westinghouse Owners Group
WOR	weld overlay repair
WP	warm pipe	welding procedure	welding project	work package	work procedure
WPB	waste processing building
WPBCWS	waste processing building chilled water system
WPC	Werner and Pfleiderer Corp.
WPCB	Waste Processing Control Board
WPLC	Wisconsin Power & Light Co.
WPPSS	Washington Public Power Supply System
WPQR	welding procedure qualification record
WPS	warm prestressing	waste processing system	welding procedure specification
WPSC	Wisconsin Public Service Corp.
WQC	water quality certification
WR	Whiteshell Reactor (Canada)	wide range	work request
WRAP	water reactor analysis program
WRC	Welding Research Council
WRGM	wide-range gas monitor
WRM	wide-range monitor	working reference material
W-RM	Westinghouse–Reactor Manufacturer
WRNMS	wide-range neutron monitoring system
WRRR	Walter Reed Research Reactor
WRSR	water reactor safety research
WRT	with respect to
WS	warm shop
WSA	work situation approach
WSCC	Western Systems Coordinating Council
WSCS	waste solidification and compaction station
WSD	working stress design
WSF	waste shipping facility
WSMF	welded-steel moment-resisting frame
WSUOPR	Washington State University Open-Pool Reactor
WT	wall thickness
WTF	waste treatment facility
WTP	water treatment plant
WTR	Westinghouse Test Reactor
WVN	water vapor nitrogen
WVOG	wet vessel off-gas
WW	well water
WWPC	Washington Water Power Co.
WWS	well water system
WWTF	waste water treatment facility
WWW	World Wide Web
XLPE	cross-linked polyethylene
XR	export reactor
XRF	explosion release factor
YAE	Yankee Atomic Electric Co.
YAEC	Yankee Atomic Electric Co.
YATA	York Area Transportation Authority
YCNP	Yellow Creek Nuclear Plant
YNHH	Yale-New Haven Hospital
YNPS	Yankee Nuclear Power Station
ZEA	zero energy assembly
ZEEP	Zero Energy Experimental Pile (Canada)
ZEPHYR	zero energy fast reactor
ZES	zero energy system
ZETA	Zero Energy Thermonuclear Apparatus (United Kingdom)	zero energy thermonuclear assembly
ZETR	Zero Energy Thermal Reactor (United Kingdom)
ZEUS	Zero Energy Uranium System (United Kingdom)
ZGS	zero gradient synchrotron
ZIP	zone improvement plan
ZNP	Zion Nuclear Plant
ZPA	zero period acceleration
ZPMB	zero power mode bypass
ZPPR	zero power plutonium reactor
ZPR	zero power reactor
ZPRF	zero power reactor facility
ZPSS	Zion Probabilistic Safety Study
ZTO	zero time outage
ZWOK	zirconium-water oxidation kinetics

by PipeAdmin
Tags: acronyms, structural