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