This is a Reference Page. Below is a list of Acronyms, in alphabetical order:

ABB Asea Brown Boveri, Ltd.
AWS American Welding Society 
CREATCS control room emergency air temperature control system
EDS non-class 1E dc and UPS system
FRS floor response spectra
AABVS auxiliary/annex building ventilation subsystem
ABB Asea Brown Boveri Company
ABWR Advanced Boiling Water Reactor
ac/AC alternating current
ACI American Concrete Institute
ACL Aktiva centrallaboratoriet (Studsvik)
ACR Advanced CANDU Reactor
ACRS Advisory Committee on Reactor Safeguards
ACS Accident Confinement System
ADAMS Agencywide Documents Access and Management System Public Electronic
ADGFOSS ancillary diesel generator fuel oil supply system
ADS Automatic Depressurization System
ADS-4 automatic depressurization system-Stage 4
ADVs atmospheric dump valves
AEA Atomic Energy Authority, UK
AEC Atomic Energy Commission, USA
AECB Atomic Energy Control Board
AECL Atomic Energy of Canada, Ltd.
AEOD NRC Office for Analysis and Evaluation of Operational Data
AESOP Atomic Energy Simulation of Optimization (computer code)
AFA Research program on Nuclear Waste, NKS 1994 – 1997
AFW auxiliary feedwater
AFWS Auxiliary Feed-Water System
AGC Advanced Gas Centrifuge
AGR Advanced Gas Cooled Reactor
AGRI See RALA
AGS Airborne Gamma Spectrometry
AHUs air handling units
AI automatic isolation
AICC Adiabatic Isochoric Complete Combustion
AISC American Institute of Steel Construction
AISI American Iron and Steel Institute
AL Action Level
ALARA as low as is reasonably achievable
ALARP As Low As Reasonably Practible
ALEX Barents Rescue 2001 Alarm Exercise
ALI Annual Limit on Intake (ICRP)
ALWR advanced light water reactor
AM Accident Management
AMAP Arctic Monitoring and Assessment Program
AMS Accelerator Mass Spectrometry
ANL Argonne National Laboratory (USA)
ANP Advanced Nuclear Power
ANS American Nuclear Society
ANSI American National Standards Institute
AOO anticipated operational occurrences
AOT Allowed Outage Time
AOV air operated valves
APEX Advanced Plant Experiment
APRI Accident Phenomena of Risk Importance (Swedish severe accident research project)
APROS Advanced Process Simulator
APWR Advanced Pressurized Water Reactor
ARGOS Accident Reporting and Guiding Operational System (Denmark)
ARM area radiation monitor
ART adjusted reference temperature
ASAR As Operated Safety Analysis Report
ASB Auxiliary Systems Branch
ASCE American Society of Civil Engineers
ASDV Atmospheric Steam Discharge Valve
ASHRAE American Society of Heating, Refrigerating and Air Conditioning
ASI Analysis Significant Items
ASME American Society of Mechanical Engineers
ASME Code American Society of Mechanical Engineers Boiler and Pressure Vessel
ASSERT Advanced Solution of Subchannel Equations in Reactor Thermalhydraulics (computer code)
ASTM American Society for Testing and Materials
AT Austria (ISO abbreviation)
ATC automatic turbine control
ATHLET Analysis of Thermo-Hydraulics of Leaks and Transients (computer code)
ATR Advanced Thermal Reactor
ATWS anticipated transient without scram
AVLIS Atomic Vapor Laser Isotope Separation
AVT all-volatile treatment
B&W Babcock and Wilcox
B&WOG  B&W Owner’s Group 
BAC bounding analysis curve 
BAM Bundesanstalt für Materialforschung und –prüfung, Germany
BAT boric acid tank
BAT Best Available Technique
BDBA Beyond Design Basis Accident
BE best estimate
BEIR Committee on the Biological Effects of Ionizing Radiations
BER Research program on Nuclear Emergency Preparedness, NKS 1994 – 1997
BH Bottom Head
BKAB Barsebäck Kraft AB, Sweden
BLC Boiler Level Control
BLW Boiling Light Water
BMU Bundesministerium für Umweltschutz und Reaktorsicherheit, Germany
BNCT Boron Neutron Capture Therapy
BNFL British Nuclear Fuel, Ltd.
BNL Brookhaven National Laboratory
BOC  beginning-of-cycle 
BOK Research program on nuclear emergency preparedness and radiological consequences, NKS 1998 – 2001
BPC Boiler Pressure Controller
Bq Becquerel
BRS Danish Emergency Management Agency (Beredskabsstyrelsen); also referred to as DEMA
BTP branch technical position 
BTWC Biolocical and Toxin Weapons Convention
BWR boiling water reactor 
BWR Boiling Water Reactor
BWROG Boiling Water Reactor Owners’ Group 
C&I Control and Instrumentation
CAMS Computerized Accident Management Support System
CANDU Canadian Deuterium Natural Uranium Heavy-Water Reactor
CAS central alarm station
CAS  compressed and instrument air system
CASS cast austenitic stainless steel
CAV  cumulative absolute velocity 
CB circuit breakers
CBP  computer-based procedures 
CBRN Chemical, Biological, Radiological, Nuclear
CBSS Council of Baltic Sea States
CC Condensate Cleaning
CCA 1. Cause Consequence Analysis 2. Common Cause Analysis
CCC Computer and Communications Center
CCF common cause failure
CCF Common Cause Failure
CCFP conditional containment failure probability 
CCI core-concrete interaction
CCI Common Cause Initiators
CCP Critical Channel Power
CCS  component cooling water system
CCW component cooling water 
CD Civil Defense
CD&ER Civil Defense and Emergency Response
CDF core damage frequency 
CDF Core Damage Frequency
CE  Combustion Engineering 
CEC Commission of the European Communities
CEDM Control Element Drive Mechanism
CEO Chief Executive Officer
CERN European Council for Nuclear Research (Conseil Europeenne pour la Recherche Nucleaire)
CET containment event tree
CF  chemistry factor
CFD Computational Fluid Dynamics
CFL late containment failure
CFM Critical Function Monitor(ing)
CFR Code of Federal Regulations
CFS  condensate and feedwater system 
CGS Car-borne Gamma Spectrometry
CHAZOP Computer HAZOP (Hazards and Operability)
CHF critical heat flux
CHF Critical Heat Flux
CHS Committee on Human Security
CI containment isolation
CIS Commonwealth of Independent States
CIS  containment isolation system
CIV containment isolation valves
CIWH condensation induced water hammer
CLAB Central Interim Storage Facility for Spent Nuclear Fuel, Sweden (Centrallager för använt bränsle)
CM Corrective Maintenance
CMS  condenser air removal system
CMT  core makeup tank 
CMT Crisis Management Team
CNRA Committee of Nuclear Regulatory Activities (OECD/NEA)
CNS Center for Nonproliferation Studies (Monterey Institute)
COGEMA Compagnie Generale des Matieres Nucleaires, France
COL combined license
COLR Core Operating Limits Report 
COMMON Q COTS common qualified platform commercial off-the-shelf
COSMOS Russian nuclear powered satellites
CP  construction permit
CPC Common Performance Conditions
CPG containment performance goal 
CPR Critical Power Ratio
CPS condensate polishing system 
cps Counts per second
CPS Control and Protection System
CR control room
CRD control rod drive
CRDM control rod drive mechanism
CRDS control rod drive system
CREFS control room emergency filtration system
CRL Chalk River Laboratories
CRPPH Committee on Radiation Protection and Public Health (OECD/NEA)
CRT Cathode Ray Tube
CS core support
CSA Comprehensive Safeguards Agreement
CSA Canadian Standards Association
CSDV Condenser Steam Discharge Valve
CSF critical safety function
CsI cesium iodide
CSNI Committee of the Safety of Nuclear Installations (OECD/NEA)
CSNI Canadian Standards for the Nuclear Industry
CSS Containment Spray System
CST condensate storage tank
CTBT Comprehensive Test Ban Treaty
CTC Counter-Terrorism Committee (UN)
CUF cumulative usage factor
CV check valve
CV Charpy V-notch
CVCS chemical and volume control system
CVD Cherenkov Viewing Device
CVS chemical and volume control system
CWC Chemical Weapons Convention
CWS circulating water system
DA Data Acquisition
DAC derived air concentration
DAC design acceptance criteria
DAD Decide, Announce, Defend
DAS diverse actuation system
DBA Design Basis Accident
DBE Design Base Earthquake
DBPB design basis pipe break
DBT design basis tornado
DC Downcomer of the reactor coolant system
DC design certification
dc/DC direct current
DCC Digital Control Computer
DCD design control document
DCH Direct Containment Heating
DD Danish Decommissioning (Dansk Dekommissionering)
DDS data and display processing system
DDT Deflagration-to-Detonation Transition
DE Germany (ISO abbreviation)
DECLG double-ended cold leg guillotine
DEDVI double-ended direct vessel injection
DEH digital electrohydraulic
DEI dose equivalent iodine
DEMA Danish Emergency Management Agency (Beredskabsstyrelsen); also referred to as BRS
DETRA Doses via Environmental Transport of Radionuclides (computer code)
DF decontamination factor
DF-ET Drift Flux-Equal Temperature
DFR Dounreay Fast Reactor
DFRIT Finnish Defense Forces Research Institute of Technology
DF-UT Drift Flux-Unequal Temperature
DG diesel generator
DHR decay heat removal
DID defense-in-depth
DiP Decision in Principle
DK Denmark (ISO abbreviation)
DKK Danish currency (crowns, kroner)
DKV Driftklarhetsverifiering
DMI Danish Meteorological Institute (Danmarks Meteorologiske Institut)
DMIMS digital metal impact monitoring system
DNB Departure from Nucleate Boiling
DNBR departure from nucleate boiling ratio
DNMI Norwegian Meteorological Institute (Det norske meteorologiske institutt)
DOD US Department of Defense
DOE US Department of Energy
DOFs degrees of freedom
DOP dioctyl-phthalate polydispersed
DOS standby diesel and auxiliary boiler fuel oil system
DOT Department of Transportation
dps Disintegrations per second
DR1, DR2, DR3 Danish research reactors at Risø National Laboratory
D-RAP design reliability assurance program
DRF Dose Reduction Factor
DSA Deterministic Safety Analysis
DSER draft safety evaluation report
DTS demineralized water treatment system
DTU Technical University of Denmark (Danmarks Tekniske Universitet)
DVI direct vessel injection
DWS demineralized water transfer and storage system
DWST demineralized water storage tank
EAB exclusion area boundary
EARP Enhanced Actinide Removal Plant (Sellafield)
EBRD European Bank for Reconstruction and Development
EBS Engineered Barrier System
EC European Commission
ECC Emergency Control Center
ECC Emergency Core Cooling
ECC equilibrium cycle core
ECCS Emergency Core Cooling System
ECI Emergency Core Injection
ECMWF European Center for Medium-range Weather Forecasts
ECURIE European system for notification in case of radiological emergencies (EU)
EdF Electricité de France
EDI electrodeionization
EDO NRC Executive Director for Operations
EDSS Environmental Decision Support System
EE Estonia (ISO abbreviation)
EF error factor
EFDA European Fusion Development Agreement
EFDS equipment and floor drainage system
EFPH Effective Full Power Hours
EFPY effective full-power year
EFW emergency feedwater
EFWS Emergency Feed-Water System
EHT effluent holdup tanks
EIA Environmental Impact Assessment
EIB European Investment Bank
EIRO Forum of collaboration between seven European Intergovernmental Scientific Research Organizations
EIS Environmental Impact Statement
EKO Radioecological research program, NKS 1994 – 1997
ELS plant lighting system
EM evaluation model
EMAS Eco Management and Audit Scheme (EU regulations)
EMC electromagnetic compatibility
EMERCON International system for notification in case of radiological emergencies (IAEA)
EMHI Estonian Meteorological and Hydrological Institute
EMI electromagnetic interference
EN 45001 EU standard for accreditation of laboratories conducting measurements onfoodstuff and issuing certificates
ENS European Nuclear Society
ENSRA European Nuclear Security Regulators Association
EOC end-of-cycle
EOF Emergency Operations Facility
EOL End Of Life
EoO Error of Omission
EOP Emergency Operating Procedure
EOS Emergency Operating Center
EP emergency planning
EPA US Environmental Protection Agency
EPIC Environmental Protection from Ionizing Contaminants in the Arctic (EU)
EPR European Pressurized Water Reactor
EPRI Electric Power Research Institute, USA
EPRI/MRP EPRI Materials Reliability Project
EQ equipment qualification
EQDP equipment qualification data package
ERA European Research Area
ERDS Emergency Response Data System
ERG emergency response guidelines
ERI Energy Research, Inc.
ERICA Environmental Risks from Ionizing Contaminants: Assessment and Management (EU)
ERPC Estonian Radiation Protection Center, Tallinn
ERVC external reactor vessel cooling
ESARDA European Safeguards Research and Development Association
ESBWR Evolutionary Simplified Boiling Water Reactor
ESF engineered safety feature
ESFA engineered safety features actuation
ESFAS engineered safety features actuation system
ESFR European Synchrotron Radiation Facility
ESP Early Site Permit
ESR Electron Spin Resonance
ESW essential service water
ET eddy current testing
ETA Event Tree Analysis
ETEX European Tracer EXperiment
ETS emergency trip system
EU European Union
EUP Enriched Uranium Product
EUR European Utility Requirements
EURADOS European Radiation Dosimetry Group
EURATOM EU/DG17 Directorate E
EURDEP EU Radioactivity Data Exchange Platform
EVET Equal Velocity Equal Temperature
EVUT Equal Velocity-Unequal Temperature
EWS Emergency Water Supply
FAO United Nations Food and Agriculture Organization
FARO Test facility at Joint Research Center Ispra for studying fuel-coolant interaction
FAS Fast Acting Scram
FASSET Framework for Assessment of Environmental Impact (EU)
FBACS fuel building air cleanup system
FBR Fast Breeder Reactor
FBR Feed, Bleed and Relief
FBTA function-based task analysis
FCC first cycle core
FCI fuel-coolant interactions
FCU fan coil unit
FDA final design approval
FE finite element
FEMA Federal Emergency Management Agency
FEP Features, Events and Processes
FHA fuel-handling accident
FHAVS fuel handling area ventilation subsystem
FI Finland (ISO abbreviation)
FIM Earlier: Finnish currency (marks, markkaa)
FIV flow-induced vibration
FLB feedwater line break
FME foreign material exclusion
FMEA Failure Mode and Effects Analysis
FMI Finnish Meteorological Institute
FN ferrite number
FO Faroe Islands (ISO abbreviation)
FOI Swedish Defense Research Agency (Totalförsvarets forskningsanstalt)
FoU Forskning och utveckling
FP 1. EU’s Framework Program 2. Fission Product(s)
FP Full Power
FPDS flat panel display system
FPS fire protection system
FRC US Federal Radiation Council
FRED FASSET Radiation Effects Database (EU; see FASSET)
FRIT Danish Science Research Councils’ Instrument Service (Host organization of the NKS Secretariat; Forskningsrådenes Instrument Tjeneste ApS)
FSAR Final Safety Analysis Report
FSER final safety evaluation report
FTA Felträdsanalys
FTP File Transfer Protocol
FUD Forskning, utveckling, demonstration
FV&V final verification and validation
FVW Fussell-Vesely worth
FW feedwater
FZK Forschungszentrum Karlsruhe
G24 All western European countries plus USA, Canada, Japan, Australia, New Zealand, and Turkey
G7 USA, Japan, Germany, France, UK, Italy and Canada
GALE gaseous and liquid effluent
GAN Nuclear safety authority of the Russian Federation (Gozatomnadzor)
GAN/HQ GAN’s headquarters, Moscow, Russia
GAN/NED GAN’s regional office, St. Petersburg, Russia (North Eastern District)
GARDS Global Atmospheric Radionuclide Detection System
GCEP Gas Centrifuge Enrichment Plant
GCHWR Gas Cooled Heavy Water Reactor
GCR Gas Cooled Reactor
GDC general design criteria/criterion
GE General Electric
Geislavarnir Icelandic Radiation Protection Institute (Geislavarnir ríkisins)
GFR Gas-Cooled Fast Reactor
GGR Gas cooled Graphite Reactor
GIS Graphical Information System
GL generic letter
GLWR Graphite Light Water Reactor
GPS 1. Global Positioning System 2. Goal Planning System
Gr Geislavarnir ríkisins (Icelandic Radiation Protection Institute)
GRCAs gray rod cluster assemblies
GRS Gesellschaft für Anlagen- und Reaktorsicherheit mbH
GSI generic safety issue
GSS turbine gland seal system
GTMHR Gas Turbine Modular Helium Reactor
GTRI Global Threat Reduction Initiative
Gy Gray
H2TS hierarchical, two-tiered scaling
HAEA Hungarian Atomic Energy Agency
HAMISA Hole Ablation Modelling In Severe Accidents (computer code)
HAZ Heat Affected Zone
HAZ heat-affected zone
HAZOP Hazards and Operability
HCCF Human Common Cause Failure
HCD Head of Civil Defense
HCF high cycle fatigue
HCLPF high confidence that the particular SSC will have a low probability of failure
HCMS hydrogen concentration monitoring system
HCSD hot/cold shutdown
HEDs human engineering discrepancies
HEL high-energy line
HELB high-energy line break
HELCOM/MORS Helsinki Commission/Monitoring Of Radioactive Substances in the Baltic Sea
HEM Homogeneous Equilibrium Model
HEP human error probability
HEPA high-efficiency particulate air
HEU Highly Enriched Uranium
HFE Human Factor Engineering
HFP hot full-power
HFS Human Factors Society
HIC high-integrity containers
HICB Instrumentation and Controls Branch
HIM See KTM
HIRLAM HIgh Resolution Limited Area Model (Nordic numerical weather predictionmodel)
HLHS heavy load handling system
HLW High Level Waste
HPCI high-pressure coolant injection
HPGe High Purity Germanium (Detector)
HPI high-pressure injection
HPME High Pressure Melt Ejection
HPS Health Physics Society
HPSI high-pressure safety-injection
HR High Resolution
HRA Human Reliability Analysis
HRICPMS High Resolution Inductively Coupled Plasma Mass Spectrometry
HRP Halden Reactor Project
HSI Human – System Interface(s)
HSI human-system interface
HTG Högsta tillåtna gränsvärde
HTGR High Temperature Gas Cooled Reactor (graphite moderated)
HTML Hyper Text Markup Language
HTR High Temperature Reactor
HTS Heat Transport System
HTTP Hyper Text Transfer Protocol
HVAC High Voltage Alternating Current
HVAC heating, ventilation, and air conditioning
HVDC High Voltage Direct Current
HWBLWR Heavy Water Boiling Light Water Reactor
HWGCR Heavy Water Gas Cooled Reactor
HWLWR Heavy Water Light Water Reactor
HWP Heavy Water Plant
HWR Heavy Water Reacto r
HX heat exchanger
HYDNA Hydraulic Network Analysis (extinct computer code)
HZP hot zero-power
I&C Instrumentation and Control
I/O input/output
IACRS Inter-Agency Committee on Radiation Safety (IAEA)
IAEA International Atomic Energy Agency
IAS instrument air system
IASAP International Arctic Seas Assessment Project (IAEA)
IASCC Irradiation-Assisted Stress Corrosion Cracking
IBIF Intermittent Buoyancy Induced Flow
IC intact containment
ICC inadequate core cooling
ICCDP incremental conditional core damage probability
ICEM International Conference(s) on Environmental Remediation and Radioactive Waste Management
ICI In-Core Instrumentation
ICJ International Court of Justice
ICPMS Inductively Coupled Plasma Mass Spectrometry
ICRE International Commission on Radiation Education
ICRP International Commission on Radiological Protection
ICRR International Congress of Radiation Research
ICRU International Commission on Radiation Units and Measurements
ICSB Instrumentation and Control Systems Branch
IDC International Data Center
IDS Class 1E dc system
IE Initiating Event
IEA International Energy Agency
IEB Inspection and Enforcement bulletin
IEC International Electrotechnical Commission
IEEE Institute of Electrical and Electronics Engineers
IFE Institute for Energy Technology (Institutt for Energiteknikk), Norway
IFM intermediate flow mixing
IGSC Integrated Group for the Safety Case (OECD/NEA)
IGSCC Inter-Granular Stress Corrosion Cracking
IHP integrated head package
IIASA International Institute for Applied Systems Analysis
IIS in-core instrumentation system
IL Intervention Level
ILO International Labor Organization
ILRT integrated leak rate testing
ILW Intermediate Level Waste
IN information notice
INEEL Idaho National Engineering and Environmental Laboratory
INEL Idaho National Engineering Laboratory
INES International Nuclear Event Scale (IAEA)
INEX International Emergency Preparedness Exercise (OECD/NEA)
INIS International Nuclear Information System (libraries etc.)
INPO Institute of Nuclear Power Operations
INPP Ignalina Nuclear Power Plant, Lithuania
INSAG International Nuclear Safety Advisory Group (IAEA)
INSITE Independent Site Investigation Tracking & Evaluation (SKI)
IPCC Intergovernmental Panel on Climate Change
IPPC Integrated Pollution Prevention and Control Directive (EU)
IPSAC investment protection short-term availability controls
IRPA International Radiation Protection Association
IRPI Icelandic Radiation Protection Institute (Geislavarnir ríkisins)
IRWST in-containment refueling water storage tank
IS Iceland (ISO abbreviation)
ISA Instrument Society of America
ISA 1. Integrated Sequence Analysis 2. Integrated Safety Analysis
ISDN Integrated Service Digital Network
ISER Intrinsically Safe and Economical Reactor
ISI In-Service Inspection
ISK Icelandic currency (crowns, krónur)
ISLOCA intersystem loss-of-coolant accident
ISLOCA interfacing systems loss-of-coolant
ISO International Standardization Organization
ISO 14000 ISO standards on environmental management systems
ISO 9000 ISO standards on quality systems
ISOCS In-Situ Object Counting System
ISOE Information System on Occupational Exposure (joint OECD/NEA and IAEA activity)
ISP Internet Service Provider
ISR International Society of Radiology
IST In-Service Testing
ISTC International Science and Technology Center, Moscow, Russia
IT Information Technology
ITAAC inspection, test, analyses, and acceptance criteria
ITER International Thermonuclear Experimental Reactor
ITG Issue Task Group
ITP initial test program
ITRAP Illicit Trafficking Radiation Detection Assessment Program
IUR International Union of Radioecologists
IVO Imatran Voima Oy, Finland (IVO Group includes IVO Power Engineering and Loviisa NPP) – now belonging to Fortum
JINEX Joint Internationa Nuclear Emergency Exercises (OECD/NEA)
JRC EU’s Joint Research Center, Ispra, Italy
K (Degrees) Kelvin
KAN Nuclear safety and waste management research program, NKS 1990-1993
KASAM National Council for Nuclear Waste, Sweden (Statens råd för kärnavfallsfrågor)
KBS-3 Kärnbränslecykelns slutsteg – Använt kärnbränsle
Kd Distribution coefficient
KIPT Kharkov Institute for Science and Technology, Ukraine
KLDRA Combined interim storage and final repository for low and medium level radioactive waste, Himdalen, Norway (Kombinert lager og deponi for lavt og middels radioaktivt avfall)
KNPP Kola Nuclear Power Plant, Russia
KROTOS Test facility at Joint Research Center Ispra for studying steam explosions
KSU Nuclear Training and Safety Center, Sweden (Kärnkraftsäkerhet och utbildning AB)
KTH Royal Institute of Technology, Sweden (Kungliga Tekniska Högskolan); also referred to as RIT
KTM Ministry of Trade and Industry, Finland (Kauppa- ja teollisuusministeriö, Handels- och industriministeriet); also referred to as HIM
KU Investigation of Consequences, Sweden (Konsekvensutredning)
LBB Leak Before Break
LBHSs large-bore hydraulic snubbers
LBLOCA large-break loss-of-accident accident
LCF low cycle fatigue
LCO Limiting Conditions for Operation
LCSs local control stations
LDS leakage detection system
LEFM linear elastic fracture mechanics
LER Licensee Event Report
LERF large early release fraction
LEU Low Enriched Uranium
LFR Lead-Cooled Fast Reactor
LIBS Laser Induced Breakdown Spectrometry
LIVEX Barents Rescue 2001 Live Exercise
LLHS light load handling system
LLOCA large LOCA
LLW Low Level Waste
LMFW loss of main feedwater
LNPP Leningrad Nuclear Power Plant, Russia ("Sosnovyy Bor")
LNT Linear No Threshold dose – response model
LOC Loss of Coolant
LOC/LOECC Loss of Coolant with Coincident Loss of Emergency Core Cooling
LOCA Loss of Coolant Accident
LOF Loss Of Flow (accident)
LOFT loss-of-flow tests
LOFTRAN transient and SGTR computer analysis code
LONF loss of normal feedwater
LOOP loss of offsite power
LOP Loss of Pumping
LOR Loss of Regulation
LORACON Local Radioactivity Control
LORAKON See LORACON
LP low pressure
LPSA Living PSA
LPSI low pressure safety injection
LPZ low population zone
LRA license renewal application
LRF large release frequency
LSA Low Specific Activity
LST large-scale tests
LSTF Large-Scale Test Facility
LT Lithuania (ISO abbreviation)
LTA Logic Tree Analysis
LTC long-term cooling
LTOP low-temperature overpressure protection
LV Latvia (ISO abbreviation)
LWBR Light Water Breeder Reactor
LWCHWR Light Water Coolant Heavy Water Reactor
LWGR Light Water Cooled Graphite Moderated Reactor
LWR Light Water Reactor
LWR  light water reactor
MAAP4 Modular Accident Analysis Program
MAGNOX Natural uranium-metal fuel in magnesium-aluminum-beryllium alloy cladding
manSv man-sievert
Marina Project supported by the European Commission to evaluate the radiological impact of natural and anthropogenic radioactivity in the sea and to provide an overall view of the radiological exposure of the populations to sources of radioactivity in the sea
Marina Balt A Marina project regarding the Baltic sea, arranged in 1996 - 1998 (cf. Marina)
MÁU Environmental Impact Statement, Iceland (Mat á umhverfisáhrif)
MBA Material Balance Area
MC&A Material Control and Accountability
MCC Main Circulation Circuit
MCCI Molten Core – Concrete Interaction
MCCR Ministry of Corporate and Consumer Relations
MCP Main Circulation Pump
MCR main control room
MCRE main control room envelope
MCS Maintenance Cooling System
MELCOR Integral severe accident analysis computer code
MEP Member of the European Parliament
MEPRD Ministry of Environmental Protection and Regional Development, Latvia;also referred to as VARAM
MFCS main feedwater control system 
MFCV  main feedwater control valve
MFIV main feedwater isolation valve
MFRV MFW main feedwater regulation valve main feedwater
MFWS  main feedwater system
M-G motor-generator
MHD Magneto hydrodynamics
MI Maintenance Indicator
MIL Military
milli-k Unit of reactivity for reactor physics
MINATOM Ministry for Atomic Energy Issues, Russia
MIT Massachusetts Institute of Technology
MKB In Finland: Environmental Impact Assessment (miljökonsekvensbedömning) In Sweden: miljökonsekvensbeskrivning, which means either Environmental Impact Statement (document) or Environmental Impact Assessment (process)
ML Mid-Loop
MLOCA Medium LOCA
MLW Medium Level Waste
MMI 1. Man-Machine Interaction 2. Man-Machine Interface
M-MIS  man-machine interface system
MMSVs Main Steam Safety Valves
MORS Monitoring of Radioactive Substances in the Baltic Sea, an intergovernmental group of experts under HELCOM 1986 – 1996; cf. HELCOM, HELCOM/MORS and MORS-PRO
MORS-PRO The MORS project, since 1996 carried out under the HELCOM umbrella
MOV MRP MS motor operated valve Materials Reliability Program main steam
MOX Mixed Oxide Reactor Fuel
MPC&A Nuclear Materials Protection, Control And Accounting
MPP Marked Point Process
MS Mass Spectrometry
MS&FW main steam and feedwater
MSCo Murmansk Shipping Company, Russia
MSGTR  multiple steam generator tube rupture
MSI Maintenance Significant Items
MSIV  main steam isolation valve
MSLB main steamline break
MSR Molten Salt Reactor
MSSS  main steam supply system  
MSV Main Safety Valve
MTC Moderator Temperature Coefficient
MTO Man-Technology-Organization (Människa-Teknik-Organisation)
MUSTER Multi User System for Training of Emergency Response
MUX Multiplexer
MWe Megawatt electric energy
MWt Megawatt thermal energy
NACE National Association of Corrosion Engineers
NASA US National Aerodynamics and Space Administration
NATO North Atlantic Treaty Organization
NCC Natural Convection Cooldown
NCIG  Nuclear Construction Issues Group 
NDA Non-Destructive Analysis
NDEP nondestructive examination
NDEP Northern Dimension Environmental Partnership
NDT Non-Destructive Testing
NDT nil-ductility temperature 
NE Nuclear Electric, UK
NEA Nuclear Energy Agency (under OECD)
NEMA National Electrical Manufacturers Association
NEP Nordic Nuclear Emergency Preparedness Group
NEPTUNO Nuclear European Platform for Training and University Organizations
NFPA National Fire Protection Association
NGO Non-Governmental Organization(s)
NGU Geological Survey of Norway (Norges geologiske undersøkelse)
NI nuclear island
NIB Norwegian Investment Bank
Ni-Cr-Fe nickel-chromium-iron
NII Nuclear Installations Inspectorate, UK
NILU Norwegian Institute for Air Research (Norsk institutt for luftforskning)
NIRH National Institute of Radiation Hygiene (SIS), Denmark
NIS Newly Independent States
NKA Nordiska Kontaktorganet för Atomenergifrågor (Predecessor of NKS)
NKS Nordic Nuclear Safety Research (Nordisk KerneSikkerhedsforskning)
NLH Norwegian Agricultural University (Norges Lantbrukshøjskole)
NMR Nordic Council of Ministers (Nordiska ministerrådet)
NNWS Non-Nuclear-Weapon States
NO Norway (ISO abbreviation)
NOK Norwegian currency (crowns, kroner)
NOPE NEA's Office for Press Entertainment
NORM Naturally Occurring Radioactive Materials
NOU Norwegian Public Investigations (Norges offentlige utredninger)
NPD Nuclear Power Demonstration
NPP Nuclear Power Plant
NPPA National Physical Planning Agency, Iceland
NPSAG Nordic PSA Group
NPSH Net Positive Suction Head
NPT Non-Proliferation Treaty
NRA Nuclear Energy Authority
NRC US National Regulatory Commission
NRPA Norwegian Radiation Protection Authority (Statens strålevern)
NRPB National Radiation Protection Board, UK
NRPS Nordic Radiation Protection Society; also referred to as NSFS
NSA Nuclear Safety Account (under EBRD)
NSC Nuclear Science Committee (under OECD/NEA)
NSFS Nordic Society for Radiation Protection (Nordiska sällskapet för strålskydd)
NSG 1. Nuclear Suppliers Group 2. Nuclear Suppliers Guidelines
NTNU Norwegian University of Science and Technology
NUCIRC Nuclear Circuits (computer code)
NUEXCO Nuclear Exchange Corporation
NUSS Nuclear Safety Standards (IAEA)
NWFZ Nuclear Weapon-Free Zones
NWS Nuclear-Weapon States
O&M Operation and Maintenance
OBE operating-basis earthquake
OCS operation and control centers system
ODCM offsite dose calculation manual
OECD Organization for Economic Cooperation and Development
OER operating experience review
OH Ontario Hydro
OIL Operational Intervention Level
OKG Oskarshamn NPP, Sweden (Oskarshamn KraftGrupp AB)
OL operating license
OM operation and maintenance
OMT Object Modelling Technique
OPDMS on-line power distribution monitoring system
OPEC Organization of Petroleum Exporting Countries
OPS onsite power systems
OSA operational sequence analysis
OSC operational support center
OSPAR Convention for the Protection of the Marine Environment of the North-East Atlantic
OSU Oregon State University
P&ID piping and instrumentation drawings
P/T pressure and temperature
PA Performance Assessment
PACOMA Performance Assessment of the Geological Disposal Medium-Level and Alpha Waste in a Clay Formation in Belgium
PAHO Pan American Health Organization
PAM postaccident monitoring
PAP Decision in Principle Process
PAR passive autocatalytic recombiner
PASCAL PFM Analysis of Structural Components in Ageing LWRs
PASS postaccident sampling system
PASULA Computer code modelling structural and thermal behavior of instrument tube penetrations in the reactor vessel lower head
PBMR Pebble Bed Modular Reactor
PCA primary coolant activity
PCCS Passive Containment Cooling System
PCCWST passive containment cooling water storage tank
PCP process control program
PCRV Pre-Stressed Concrete Reactor Vessel
PCS passive containment cooling system (AP1000)
PCS Purification and Cooling System
PCT Peak Cladding Temperature
PDMS Plant Design Management System
PFM Probabilistic Fracture Mechanics
PfP Partnership for Peace
PFR Prototype Fast Reactor
PGA peak ground acceleration
PGS plant gas systems
PGSA Pickering Generating Station A
PHARE Poland Hungary Aid for Reconstruction of the Economy, EU (later includingall central and eastern European countries)
PHRS Passive Heat Removal System
PHS US Public Health Service
PHTS Primary Heat Transport System
PHW Pressurized Heavy Water
PHWR Pressurized Heavy Water Reactor
PID Process Influence Diagram
PIFRAP Computer code for calculating crack growth in pipes
PIPA Photon Induced Positron Annihilation
PIRT phenomena identification and ranking table
PIUS Process Inherent Ultimate Safety (plant design by ABB Atom, Sweden)
PIV Physical Inventory Verification
PL Poland (ISO abbreviation)
PLC programable logic controller
PLEX Plant License Extension
PLHR peak linear heat rate
PLIM Plant Life Management
PLS plant control system
PM Preventive Maintenance
PMF probable maximum flood
PMP probable maximum precipitation
PMS protection and safety monitoring system
PMS DEMA’s Permanent Measurements System
POP Post Office Protocol
PORV power-operated relief valve
POV power-operated valve
ppm Parts per million
PPP 1. Polluter Pays Principle 2. Point to Point Protocol
PPS Plant Protection System
PPT Public Participation and Transparency
PRA Probabilistic Risk Assessment
PREACS pump room exhaust air cleanup system
PRESCON2 Pressure Containment (computer code)
PRHR Passive Residual Heat Removal
PRHR HX passive residual heat removal heat exchanger
PRIS Nuclear Power Reactor Information System (IAEA Database)
PS 1. Process System 2. Predictive Simulator
PSA Probabilistic Safety Analysis
PSAI plant specific action items
PSAR Preliminary Safety Analysis Report
PSARV pressurizer safety and relief valve
PSB Power Systems Branch
PSD power spectral density
PSDF power spectral density function
PSI preservice inspection
PSI Proliferation Security Initiative
PSS primary sampling system
PSV pressurizer safety valve
PTLR pressure-temperature limits report
PTS pressurized thermal shock
PVRC Pressure Vessel Research Council
PWHT post weld heat treatment
PWR Pressurized Water Reactor
PWS potable water system
PWSCC primary water stress corrosion cracking
PXS passive core cooling system
PZR pressurizer
QA Quality Assurance
QC Quality Control
QDPS qualified data processing system
QF Quality Factor
QG NRC Quality Group
QMS quality management system
QRA Quantified Risk Assessment
QUENCH Test facility at Forschungszentrum Karlsruhe, Germany
R&D Research and Development
R&M Reliability and Maintainability
R2 Test reactor at Studsvik, Sweden
RAD Radioecology research program, NKS 1990 – 1993
RADWASS Radioactive Waste Management Standards (IAEA)
RAI request for additional information
RAK Reactor safety research program, NKS 1994 – 1997
RALA Icelandic Agricultural Research Institute; also referred to as AGRI
RAM Radioactive Material
RAMA Reactor Analysis Implicit Algorithm
RAMI reliability, availability, maintainability, and inspection
RAP reliability assurance program
RAT reserve auxiliary transformer
RAW risk achievement worth
RB Reactor Building
RBMK Russian "Channelized Large Power Reactor" (water-cooled graphite-moderated reactor)
RC reactor coolant
RCA radiologically controlled area
RCCA rod cluster control assembly
RCDT reactor coolant drain tank
RCL reactor coolant loop
RCM Reliability Centered Maintenance
RCP reactor coolant pump
RCPB reactor coolant pressure boundary
RCS Reactor Coolant System
RDBMS Relational DataBase Management System
RDC Radiation Protection Center, Riga
RDD Radiological Dispersion Devices (“dirty bombs”)
RDIPE Research and Development Institute of Power Engineering, Russia (alsoknown as the Adamov Institute, with branches in Moscow and St. Petersburg
RECRIT Computer code for BWR recriticality and reflooding analyses
REID Risk of Exposure Induced Death
rem roentgen equivalent man (unit of radiation exposure)
REPU Reprocessed Uranium
RES NRC Office of Nuclear Regulatory Research
RES Rock Engineering System
RESUME Rapid Environmental Surveying Using Mobile Equipment (NKS)
RETS radiological effluent technical specifications
RETU Finnish Research Program on Reactor Safety (Reaktoriturvallisuuden tutkimusohjelman)
RF 1. Resuspension Factor 2. Russian Federation
RFA robust fuel assemblies
RFC Request For Comments
RFI radio frequency interference
RG regulatory guide
RH relative humidity
RHR Residual Heat Removal
RIA Reactivity Initiated Accident
RIE Reactivity Initiated Event
RIF Risk Increase Factor
RIH Reactor Inlet Header
RI-ISI Risk-Informed In-Service Inspection
RIMPUFF Risø’s Short Distance Model for Dispersion of Radioactive Material
RISCOM Risk Communication – Model for transparency; and EU project
RIT Royal Institute of Technology, Sweden (Kungliga Tekniska Högskolan); also referred to as KTH
RMA Ranstad Mineral AB
RMI reflective metallic insulation
RMS radiation monitoring system
RMS Radionuclide Monitoring System
RMWR Reduced Moderation Water Reactor
RNS normal residual heat removal system
RO reactor operator
RO reverse osmosis
ROAAM Risk Oriented Accident Analysis Methodology
RODOS Real-Time On-Line Decision Support System for Nuclear Emergency Management (EU)
ROH Reactor Outlet Header
ROSA Rig of Safety Assessment
RPC Radiation Protection Center, Vilnius
RPS reactor protection system
RPV Reactor Pressure Vessel
RRSP Regional Radiological Security Partnership
RRW risk reduction worth
RSB Reactor Systems Branch
RSC Radioactive Substances Committee
RSG Replacement Steam Generator
RSP Radiological Security Partnership
RSR remote shutdown room
RSS remote shutdown station
RSW remote shutdown workstation
RT reactor trip
RTD resistance temperature detector
RTD Resistance Temperature Detectors
RTDP revised thermal design procedure
RTG Radioactive Thermal Generator
RTNSS regulatory treatment of non-safety systems
RTP rated thermal power
RTS reactor trip system
RU Russian Federation (ISO abbreviation)
RV reactor vessel
RVH reactor vessel head
RVHV reactor vessel head vent
RVLIS reactor vessel level indication system
RWM Radioactive Waste Management
RWMC Radioactive Waste Management Committee (OECD/NEA)
RWS raw water system
RWST refueling water storage tanks
S/G steam generator
SACF single active component failure
SADT Structured Analysis and Design Technique
SAFDL specified acceptable fuel design limit
SALP Systematic Assessment of Licensee Performance
SAM seismic anchor motions
SAM 1. Severe Accident Management 2. Project coordination and administrative services, NKS 1990 – 1997 (samordningsfunktionen)
SAMDA severe accident mitigation design alternative
SAMG Severe Accident Management Guidelines
SAR 1. Search And Rescue 2. Safety Analysis Report
SARA Severe Accident Recriticality Analysis (EU project 1997-1998)
SAT systematic approach to training
SAVE Spatial Analysis of Vulnerable Ecosystems in Europé (EU project)
SBA Cross-disciplinary activities, NKS 1998 – 2001
SBLOCA small-break loss-of-coolant accident
SBO station blackout
SBWR Simplified Boiling Water Reactor
SC seismic category
SCC stress-corrosion cracking
SCDAP/RELAP5 Computer code modelling in-vessel severe accident phenomena
SCMP software configuration management plan
SCS Shut-Down Cooling System
SCWR Super-Critical Water-Cooled Reactor
SDM Safety Design Matrices
SDS Safety Depressurization System
SE Sweden (ISO abbreviation)
SEA Science and Engineering Associates, Inc.
SEA Strategic Environmental Assessment
SECY Office of the Secretary of the Commission
SEK 1. Swedish currency (crowns, kronor) 2. Svenska Elektriska Kommissionen 3. Project coordination and administrative services, NKS 1998 – 2005 (sekretariatsfunktionen)
SER safety evaluation report
SESAM Senior Experts on Severe Accident Management (OECD/NEA)
SESAR Senior Experts on Safety and Research (OECD/NEA)
SFCV startup feedwater control valve
SFD severe fuel damage
SFIV startup feedwater isolation valve
SFL Final Repository for Long-Lived Waste, Sweden (Slutförvar För Långlivat avfall)
SFP spent fuel pool
SFPCPS spent fuel pool cooling and purification system
SFR 1. Final Repository for Radioactive Operational Waste, Sweden (Slutförvar För Reaktoravfall) 2. Sodium-Cooled Fast Reactor
SFS startup feedwater system
SFS spent fuel pool cooling system
SFW startup feedwater
SG steam generator
SG Strategy Generator
SGBS steam generator blowdown system
SGD subgroup design
SGR Sodium Graphite Reactor
SGS steam generator system
SGSV steam generator safety valve
SGTR Steam Generator Tube Rupture
SGU Geological Survey of Sweden (Sveriges Geologiska Undersökning)
SI State Identification
SIK Reactor safety research program, NKS 1990 – 1993
SIMULATE-3K Computer code modelling core neutronics and thermal-hydraulics
SIP Swedish International Project/Nuclear Safety (under SKI)
SIR Safeguards Inspection Report (IAEA)
SIS 1. Danish Radiation Protection Authority (Statens Institut for Strålehygiejne) 2. Safety Injection System 3. Standardiseringskommissionen i Sverige
SIUS International Development Cooperation Program of the Swedish Radiation Protection Authority (SSIs internationella utvecklingssamarbete)
SJV Statens jordbruksverk, Sweden
SKB Swedish Nuclear Fuel and Waste Management Co. (Svensk kärnbränslehantering AB)
SKC Svenskt kärntekniskt centrum (Swedish Center for Nuclear Technology)
SKI 1. Swedish Nuclear Power Inspectorate (Statens kärnkraftinspektion) 2. Swedish Quality Index (Svenskt Kvalitetsindex)
SKIFS SKI Regulations (SKIs författningssamling)
SLB steam line break
SLU Swedish University of Agricultural Sciences (Sveriges lantbruksuniversitet)
SLV Statens livsmedelsverk, Sverige
SM System Manager
SMA seismic margin analysis
SMACNA Sheet Metal and Air Conditioning Contractors’ National Association
SMART System-Integrated Modular Advanced Reactor
SMHI Swedish Meteorological and Hydrological Institute (Sveriges meteorologiska och hydrologiska institut)
SMS special monitoring system
SMS Short Message Services
SNAP Severe Nuclear Accident Program
SNNAP Swedish Nuclear Non-Proliferation Assistance Program (SKI)
SOAR State Of the Art Report
SOERs Significant Operating Event Reports
SOMP software operation and maintenance plan
SOPHT Simulation of Primary Heat Transport (computer code)
SOS Reactor safety, waste management and radiation protection research program, NKS 1998 – 2001
SPDS safety parameter display system
SPE Solar Particle Events
SPES Simulatore per Esperienze di Sicurezza
SPLB NRC Plant Systems Branch
SPM software program manual
SPSA Shutdown PSA
SPWR Simplified Pressurized Water Reactor
SQAP software quality assurance plan
SR safety-related
SR surveillance requirement
SRM staff requirements memorandum
SRO senior reactor operator
SROA safety-related operator action
SRP Standard Review Plan
SRSS square root of the sum of squares
SRST spent resin storage tank
SRV safety relief valve
SRV Swedish Rescue Services Agency (Statens räddningsverk)
SRV Safety Relief Valve
SRXB Reactor Systems Branch
SS shift supervisor
SSAC State System for Accountancy for and Control of Nuclear Materials
SSAR standard safety analysis report (AP600)
SSCs structures, systems and components
SSDs System Specification Documents (AP600)
SSE safe-shutdown earthquake
SSI soil-structure interaction
SSI Swedish Radiation Protection Authority (Statens strålskyddsinstitut)
SSIFS SSI Regulations (SSIs författningssamling)
SSP software safety plan
SSS secondary sampling system
SST small scale test
STA shift-technical advisor
STARC Stop – Think – Act – Review – Communicate
START US – Soviet nuclear disarmament treaty
STD standard
STF Säkerhetstekniska föreskrifter
STS standard technical specification
STUK Finnish Radiation and Nuclear Safety Authority (Säteilyturvakeskus, Strålsäkerhetscentralen)
SUFS startup feedwater system
SUFWS startup feedwater system
Sv Sievert
SV Signal Validation
SVAFO AB SVAFO (Sydkraft, Vattenfall, Forsmark, Oskarshamn), presently owned by Studsvik AB
SVVP software verification and validation plan
SWMS solid waste management system
SWS service water system
T/H Thermal-Hydraulics
TACIS Technical Assistance to the Commonwealth of Independent States, EU
TASCS thermal stratification, cycling and striping
Tavg average temperature
TCDC Technical Cooperation among Developing Countries
TCF Technical Cooperation Fund (IAEA)
TCP 1. Technical Cooperation Program (IAEA) 2. Transmission Control Protocol
TCS turbine building closed cooling system
TDS turbine island vents, drains, and relief system
TECDOC Technical Document (IAEA)
TEDE total effective dose equivalent
TGSCC transgranular stress corrosion cracking
T-H thermal-hydraulic
THD total harmonic distortion
the Code ASME Boiler and Pressure Vessel Code
THERP technique for human error rate prediction
THORP Thermal Oxide Reprocessing Plant at Sellafield, UK
TID total integrated dose
TLD ThermoLuminescent Dosimeter/Dosimetry
TMI Three Mile Island
TOFFEA Two Fluid Flow Equation Analysis (computer code)
TopSafe Regular international topical meetings on reactor safety and new concepts in nuclear power production (arranged by ENS in cooperation with the hostcountry’s counterpart)
TopSeal Regular international topical meetings demonstrating the practical achievements of nuclear waste management and disposal (arranged by ENS in cooperation with the host country’s counterpart)
TQM Total Quality Management
TRADOS Meteorological long-range trajectory and dispersion model
TRAM Transport of Radioactive Material
TRIGA Training and Research Reactor
TS technical specifications
TS Tracking Simulator
TSC Technical Support Center
TSP trisodium phosphate
TUD Availability, maintenance and operation (Tillförlitlighet, underhåll och drift)
TVO Industrial Power Ltd., Finland (Teollisuuden Voima Oy, Industrins Kraft)
UAT unit auxiliary transformers
UBC Uniform Building Code
UCSB University of California, Santa Barbara
UET unfavorable exposure time
UGS Urban Gamma Spectrometry
UHS ultimate heat sink
UN United Nations
UNEP United Nations Environmental Program
UNIDIR United Nations Institute for Disarmament Research
UNIDO United Nations Industrial Development Organization
UNIPEDE International Union of Producers and Distributors of Electrical Energy, Paris, France
UNSCEAR United Nations Scientific Committee on the Effects of Atomic Radiation
UOC Uranium Ore Concentration
UPS uninterruptable power supply
UR Utility Requirements
URD Utility Requirements Document
URL 1. Underground Research Laboratory 2. Uniform Resource Locator
URS ultimate rupture strength
US United States of America (ISO abbreviation)
US NRC US Nuclear Regulatory Commission
USACDA US Arms Control and Disarmament Agency
USD US currency (dollars)
USE upper-shelf energy
USEC US Enrichment Corporation
USI unresolved safety issues
UT ultrasonic testing
UTC Universal Time Coordinate
UVUT Unequal Velocity Unequal Temperature
V&V verification and validation
VALDOR Values in Decisions on Risk
VAPORE valve and pressure operating related experiments
VARAM See MEPRD
VAS radiologically controlled area ventilation system
VATESI Nuclear Safety Authority, Vilnius, Lithuania
VB Vacuum Building
VBS nuclear island nonradioactive ventilation system
VC Vacuum Chamber
VCS containment recirculation cooling system
VDU video display unit
VES main control room emergency habitability system
VFS containment air filtration system
VHP vessel head penetration
VHS health physics and hot machine shop HVAC system
VHTR Very High Temperature Reactor
VIC Vienna International Center (where IAEA is located)
VLJ Nuclear power plant operational waste (Finnish: Voimalaitosjäte)
VLJ Repository Disposal facility for low and medium level operational waste arising at the Olkiluoto nuclear plant
VR Virtual Reality
VRML Virtual Reality Modeling Language
VRS radwaste building HVAC system
VTS turbine building ventilation system
VTT Technical Research Center of Finland (Valtion teknillinen tutkimuskeskus)
VVER Russian pressurized light-water reactor
VVM Environmental Impact Statement (Norwegian: Vurderinger af virkninger påmiljøet)
VWS central chilled water system
VXS annex/auxiliary buildings non-radioactive HVAC system
VYS plant hot water heating system
VZS diesel generator DG building heating and ventilation system
WANO World Association of Nuclear Operators
WAP Wireless Application Protocol
WATRP Waste management Assessment and Technical Review Program (IAEA)
WCAP Westinghouse Commercial Atomic Power (report)
WCOBRA/TRAC Westinghouse large break LOCA and long term cooling computer analysis code
WDS Waste Documentation System
WDT water distribution tests
WEC World Energy Council
WENRA Western European Nuclear Regulators Association
WG water gauge
WG Weapon Grade
WGOTHIC Westinghouse-GOTHIC analysis code
WGS gaseous radwaste system
WHO World Health Organization
WIN Women In Nuclear
WLS liquid radwaste system
WMD Weapons of Mass Destruction
WMO World Meteorological Organization
WNA World Nuclear Association
WNTI World Nuclear Transport Institute
WNU World Nuclear University
WOG Westinghouse Owners Group
WPS Warm Pre-Stress
WRC Welding Research Council
WRE Whiteshell Research Establishment
WRS radioactive waste drain system
WSS solid radwaste system
WTO World Trade Organization
WWS waste water system
YDINO Finnish gaussian short-range meteorological dispersion model
YVA Environmental Impact Assessment, Finland (Ympäristövaikutusten arviointi)
YVL Finnish safety guidelines for nuclear power plants (Ydinvoimalaitos)
ZOS onsite standby power system
ZPA zero period acceleration