核专业英语

英文	中文…	备注
ACC accumulator	安注水箱	volume for safety injection
AE	控制棒组件	absorbing element
AFWS	辅助给水系统	auxiliary feedwater system
baffle	堆芯围板	置于吊篮内侧
barrel	堆芯吊篮	Core (support) barrel属于堆芯下部支撑结构，装载着反应堆。其他的下栅格板、热中子屏蔽、堆芯围板等都依附于其上。
bypass	旁路	bypass flow 旁流
CEDM、CRDM	控制棒驱动机构	control element/rod drive mechanism
CMT	堆芯补水箱	core makeup tank
cold leg	冷管段（冷腿）
containment	安全壳
Core (support) barrel	堆芯吊篮	属于堆芯下部支撑结构，装载着反应堆。其他的下栅格板（下侧）、热中子屏蔽（外侧）、堆芯围板（内侧）等都依附于其上。
core support column
core support plate
core baffle	堆芯围板	置于吊篮内侧
CPR1000	中广核二代堆：岭澳二期、红沿河、宁德、阳江、防城港	China Pressurized Reactor，二代堆，源自法国M310（大亚湾）; 改进为三代ACPR1000，后与中核ACP1000融合为华龙一号HPR1000;
criticality	临界状态	堆内中子增值系数达到1，无需外界中子源就能维持功率水平
background radiation	本底辐射
data deck	数据卡	relap5输入卡
decay heat	衰变热
downcomer	下降段
dose equivalent	剂量当量	用来衡量辐射的生物效应，单位西弗Sv（Sievert，希沃特），=吸收剂量*品质因数（衡量某种辐射引起的生物学损伤能力）。
ECCS	应急堆芯冷却系统	emergency core cooling system
EPSS	应急非能动安全系统	Emergency Passive Safety System (EPSS)
feedwater	给水	e.g. SG feedwater 蒸汽发生器给水，和堆芯流动类似也是先下降段再上升段
FP	满功率	full power
fuel assembly/bundles	燃料组件，燃料棒
GNPS	大亚湾核电站（广东核电站）	Guangdong Nuclear Power Station (GNPS)
guide tubes	控制棒导向管
hot leg	热管段（热腿）
HPR1000	华龙一号：	福清5、6机组，防城港3、4机组，宁德5、6机组，昌江3、4机组，漳州1、2机组
HPSI	高压安注	high pressure safety injection，高压安全注射
inner radiation hazard	内照射危害	体内放射性物质造成的危害
IPWR	一体化压水反应堆	integrated pressurized water reactor
IRWST	安全壳内置换料水箱	in-containment refueling water storage tank
latent heat	潜热
lattice	栅格
LNPS	岭澳核电站	Lingao Nuclear Power Station (LNPS)
LOCA	失水事故	loss of coolant accident
LOFA	给水丧失事故	核电站中给水系统发生故障或中断的事故。无法提供足够的冷却剂，核反应堆的温度将迅速上升，这可能导致核反应失控和燃料组件过热。
LOFT	失水试验	loss of coolant test
loop seal	环路水封	环路水封清除（LSC，loop seal clearing）：在冷管段小破口时，如果一回路自然循环驱动力不足以克服过渡段U型管内的环路水封时，自然循环被中断，导致堆芯上腔室内蒸汽不断聚积，引起堆芯坍塌液位下降和燃料包壳峰值温度上升
lower core plate	堆芯下栅格板
lower head	下封头
lower plenum	下腔室
lower support plate	堆芯支撑板	吊篮组件的底板
MFWS	主给水（系统）	main feed water system
moderator	慢化剂
MSIV	主蒸汽隔离阀	main steam isolation valve
MSLB	主蒸汽管道破裂事故	main steam large break accident
nominal	名义值; 归一化值	例如：nominal core power; Nominalization
NSSS	核蒸汽供应系统	nuclear steam supply system
PCT	燃料包壳峰值温度	peak cladding temperature
power density	功率密度	J/(m^3*s)
power grid	电网
PRA	概率风险评估	PRA (probabilistic risk assessment).
prompt critical	瞬发临界	反应堆仅靠瞬发中子prompt neutron（不靠缓发中子decay neutron）就能达到临界状态。此时反应堆很难控制
PWR	压水堆	pressurized water reactor
PZR	稳压器	pressurizer
radiator	散热器
RCS	反应堆冷却剂系统	reactor coolant system
reactivity induce	反应性引入	如scram control rod bank reactivity induce，紧急停堆控制棒反应性引入
reactor coolant pump	主泵
reactor (pressure) vessel	反应堆（压力）容器
reflector	反射层	放在堆芯周围，反射中子减少损耗，使得反应堆体积可以减小
reflood	再淹没	在冷却剂丧失等事故中，一回路冷却剂流量减小，堆芯水位降低，燃料棒外壳可能暴露在空气中。通过安注系统等重新注入冷却剂，可以使重新淹没燃料棒。从而避免燃料棒过热，减少核反应堆事故的风险。
relief valve	释放阀
RPV	反应堆压力容器	reactor pressure vessel
RWST IRWST	换料水箱 安全壳内置换料水箱	refueling water storage tank in-containment refueling water storage tank
safety injection system	安注系统	也称应急堆芯注水系统，失水事故、主蒸汽管道破裂事故时紧急注水
safety valve	安全阀	蒸汽发生器上，弹簧加载，超压开启
SBLOCA	小破口失水事故	small break loss of coolant accident
scram	反应堆紧急停堆	据说是safety control rod ax man，配备斧头的人砍断控制棒的绳索
SG	蒸汽发生器	steam generator tube 蒸汽发生器传热管
SI	安注	safety injection
SMR	小型模块化反应堆	Small modular reactor
spacer grid	定位格架
spent fuel	乏燃料
spiders	星形架	控制棒组件上控制棒的支撑结构
surge line	波动管	pressurizer surge line
thermocouple columns	热电偶套管
thermal shield	热屏蔽	置于压力容器内壁
upper core plate	堆芯上栅格板
upper head	上封头
upper plenum	上腔室

Acronym or Abbreviation	Description
AAC	alternate AC power
AAPS	auxiliary AC power source
ABS	auxiliary boiler system
ABVS	Annex Building HVAC system
ABWR	Advanced Boiling Water Reactor
AC	alternating current
ACI	American Concrete Institute
ACM	Availability Controls Manual
ACRS	Advisory Committee on Reactor Safeguards
AEA	Atomic Energy Act
AFU	air filtration unit
AFWS	auxiliary feedwater system
AHJ	authority having jurisdiction
AHU	air handling unit
AIA	Authorized Inspection Agency
AISC	American Institute of Steel Construction
AISI	American Iron and Steel Institute
ALARA	as low as reasonably achievable
ALU	actuation logic unit
ALWR	advanced light water reactor
AMCA	Air Movement and Control Association International, Inc.
ANB	Annex Building
ANS	American Nuclear Society
ANSI	American National Standards Institute
AO	axial offset
AOA	axial offset anomaly
AOO	anticipated operational occurrence
AOV	air-operated valve
API	American Petroleum Institute
APWR	Advanced Pressurized Water Reactor
AQ	augmented quality
ARM	area radiation monitor
ARO	all rods out
ARS	acceleration response spectra
ASCE	American Society of Civil Engineers
ASD	adjustable speed drive
ASHRAE	American Society of Heating, Refrigerating, and Air-Conditioning Engineers
ASM	American Society for Metals International
ASME	American Society of Mechanical Engineers
ASTM	American Society for Testing and Materials
ATB	Administration and Training Building
ATWS	anticipated transient without scram
AVT	all-volatile treatment
AWS	American Welding Society
AWWA	American Water Works Association
BAS	boron addition system
BAST	boric acid storage tank
BDBE	beyond design basis event
BDBEE	beyond design basis external event
Acronym or Abbreviation	Description
BDG	backup diesel generator
BOC	beginning of cycle
BOL	beginning of life
BOP	balance-of-plant
BPDS	balance-of-plant drain system
BPE	bioprocessing equipment
BPSS	backup power supply system
BPVC	Boiler and Pressure Vessel Code
BRL	Ballistic Research Laboratory
BRVS	battery room ventilation system
BTP	Branch Technical Position
BWR	boiling water reactor
CAM	continuous air monitor
CARS	condenser air removal system
CAS	central alarm station
CAS	compressed air system
CCBE	common cause basic event
CCDF	conditional core damage frequency
CCDP	conditional core damage probability
CCF	common cause failure
CCFL	counter current flow limitation
CCFP	conditional containment failure probability
CDE	core damage event
CDF	core damage frequency
CDI	conceptual design information
CDM	certified design material
CDST	core damage source term
CEA	control element assembly
CES	containment evacuation system
CET	containment event tree
CEUS	central and eastern United States
CFD	computational fluid dynamics
CFDS	containment flooding and drain system
CFR	Code of Federal Regulations
CFT	containment flange tool
CHF	critical heat flux
CHFR	critical heat flux ratio
CFWS	condensate and feedwater system
CHRS	containment heat removal system
CHWS	chilled water system
CILRT	containment integrated leak rate test
CIM	civil interface macro
CIP	clean-in-place
CIS	containment isolation system
CIV	containment isolation valve
CLRF	conditional large release frequency
CLRT	containment leakage rate testing
CMAA	Crane Manufacturers Association of America
CMS	code management software
CMTR	certified material test report
Acronym or Abbreviation	Description
CNTS	containment system
CNV	containment vessel
CNVF	containment vessel failure
COC	certificate of compliance
COL	combined license
COLA	combined license application
COLR	core operating limits report
COMS	communication system
CPRS	condensate polisher resin regeneration system
CPS	condensate polishing system
CQC	complete quadratic combination
CRA	control rod assembly
CRB	Control Building
CRDM	control rod drive mechanism
CRDS	control rod drive system
CRE	control room envelope
CRHS	control room habitability system
CRM	control rod misoperation
CRVS	normal control room HVAC system
CSA	core support assembly
CSDRS	certified seismic design response spectra
CSDRS-HF	certified seismic design response spectra - high frequency
CSS	containment sampling system
CST	condensate storage tank
CTG	combustion turbine generator
CUB	Central Utility Building
CVAP	Comprehensive Vibration Assessment Program
CVCS	chemical and volume control system
CWS	circulating water system
D3	diversity and defense in depth
DAC	design acceptance criteria
DAS	distributed antenna system
DAS	diverse actuation system
DAW	dry active waste
DBA	design basis accident
DBE	design basis event
DBPB	design basis pipe break
DBST	design basis source term
DBT	design basis tornado
DC	direct current
DCA	Design Certification Application
DCD	Design Control Document (Note - this is synonymous with FSAR in this document)
DCH	direct containment heating
DCS	distributed control system
DDC	distributed Doppler coefficient
DDG	dry dock gate
DGB	Diesel Generator Building
DGBVS	Diesel Generator Building HVAC system
DHRS	decay heat removal system
DIM	display interface module
Acronym or Abbreviation	Description
DMA	dimethylamine
DNB	departure from nucleate boiling
DNBR	departure from nucleate boiling ratio
DOE	Department of Energy
DOT	Department of Transportation
D-RAP	Design Reliability Assurance Program
DSRS	Design Specific Review Standard
DSS	digital safety system
DSW	dry solid waste
DTC	Doppler temperature coefficient, fuel temperature coefficient, Doppler coefficient
DWS	demineralized water system
EAB	exclusion area boundary
EAL	Emergency Action Level
ECCS	emergency core cooling system
ECL	effluent concentration limit
EDL	equivalent dead load
EDMG	extensive damage mitigation guidelines
EDNS	normal DC power system
EDSS	highly reliable DC power system
EDSS-C	EDSS-common
EDSS-MS	EDSS-module-specific
EDV	engineering design verification
EFDS	equipment and floor drainage system
EFPD	effective full-power days
EFPY	effective full-power years
EHVS	13.8 kV and switchyard system
EIM	equipment interface module
ELVS	low voltage AC electrical distribution system
ELWR	evolutionary light water reactor
EMC	electromagnetic compatibility
EMDAP	evaluation model development and assessment process
EMDM	electromagnetic drive mechanism
EMI	electromagnetic interference
EMVS	medium voltage AC electrical distribution system
EOC	end of cycle
EOF	emergency operations facility
EOL	end of life
EOP	emergency operating procedure
EPA	electrical penetration assembly
EPA	Environmental Protection Agency
EPG	emergency procedure guidelines
EPRI	Electric Power Research Institute
EPZ	emergency planning zone
EQ	equipment qualification
EQDP	equipment qualification data package
EQRF	equipment qualification record file
ERDA	Energy Research and Development Administration
ERDS	emergency response data system
ERF	emergency response facility
ERO	Emergency Response Organization
Acronym or Abbreviation	Description
ERS	equipment requirement specification
ESAS	emergency safeguards actuation system
ESBWR	Economic Simplified Boiling Water Reactor
ESF	engineered safety feature
ESFAS	engineered safety features actuation system
ESL	equivalent static load
ESP	early site permit
ETA	ethanolamine
ETAP	Electrical Transient Analyzer Program
FA	functional analysis
FAC	flow-accelerated corrosion
FAT	factory acceptance test
FATT	fracture appearance transition temperatures
FCI	fuel-coolant interaction
FCU	fan coil unit
FDA	final design approval
FDS	fire detection system
FEM	Federation Europeenne de la Manutention
FERC	Federal Energy Regulatory Commission
FFD	fitness-for-duty
FFT	fast Fourier transform
FHA	fire hazards analysis
FHE	fuel handling equipment
FHM	fuel handling machine
FIRS	foundation input response spectra
FIT	flow-indicating transmitter
FIV	flow-induced vibration
FLEX	diverse and flexible coping strategies (based on NRC’s Fukushima task force recommendations)
FLPRA	flooding probabilistic risk assessment
FMEA	failure modes and effects analysis
FOAK	first-of-a-kind
FOM	figure of merit
FPGA	field programmable gate array
FPP	Fire Protection Program
FPRA	fire probabilistic risk assessment
FPS	fire protection system
FRA	functional requirements analysis
FRP	fiber-reinforced polymer
FSAR	Final Safety Analysis Report (Note - this is synonymous with DCD in this document)
FSG	FLEX support guidelines
FSI	fluid-structure interaction
FSSA	fire safe shutdown analysis
FSSD	fire safe shutdown
FV	Fussell-Vesely
FW	feedwater
FWB	Fire Water Building
FWH	feedwater heater
FWIV	feedwater isolation valve
FWLB	feedwater line break
FWPB	feedwater pipe break
Acronym or Abbreviation	Description
FWRV	feedwater regulating valve
FWS	feedwater system
FWTS	feedwater treatment system
GAC	granulated activated charcoal
GDC	General Design Criteria
GLPS	grounding and lightning protection system
GMRS	ground motion response spectra
GQA	graded quality assurance
GRWS	gaseous radioactive waste system
GSI	generic safety issue
GTAW	gas tungsten arc weld
GTS	generic technical specifications
HAZ	heat-affected zone
HCLPF	high confidence of low probability of failure
HCW	high-conductivity waste
HDP	Hardware Development Plan
HDPE	high-density polyethylene
HED	human engineering discrepancy
HEI	Heat Exchanger Institute
HELB	high-energy line break
HEP	human error probability
HEPA	high-efficiency particulate air
HFE	human factors engineering, human failure events
HFEITS	human factors engineering issue tracking system
HFP	hot full power
HIC	high integrity container
HIPS	highly integrated protection system
HLHE	heavy load handling equipment
HMI	human machine interface
HOV	hydraulic-operated valve
HP	high pressure, horsepower
HP-FWH	high pressure feedwater heater
HPM	human performance monitoring
HPME	high pressure melt ejection
HPN	health physics network
HRA	human reliability analysis
HRS	hardware requirement specification
HSI	human-system interface
HVAC	heating ventilation and air conditioning
HVDS	feedwater heater vents and drains system
HWM	hard-wired module
HZP	hot zero power
I&C	instrumentation and controls
IAB	inadvertent actuation block
IAS	instrument air system
IBC	International Building Code
ICIS	in-core instrumentation system
ICS	integrated control system
ID	inside diameter
IDD	interface design description
Acronym or Abbreviation	Description
IE	infrequent event, initiating event
IEC	International Electrotechnical Commission
IEEE	Institute of Electrical and Electronics Engineers
IES	Illuminating Engineering Society of North America
IET	integral effects test
IGSCC	intergranular stress-corrosion cracking
IHA	important human action
ILRT	integrated leak rate testing
INL	Idaho National Laboratory
INPO	Institute of Nuclear Power Operations
IOTBS	inadvertent opening of the turbine bypass system
IP	implementation plan
IP	intermediate pressure
IP-FWH	intermediate pressure feedwater heater
ISA	integrated safety analysis, Instrument Society of America
ISG	interim staff guidance
ISI	inservice inspection
ISLH	inservice leak and hydro
ISLOCA	interfacing systems loss-of-coolant accident
ISM	independent support motion
ISO	International Organization for Standardization
ISRS	in-structure response spectra
IST	inservice testing
ISV	integrated system validation
ITAAC	Inspections, Tests, Analyses, and Acceptance Criteria
ITM	inspection, testing, and maintenance
ITP	Initial Test Program
IVR	in-vessel retention
JLD	Japan Lessons-Learned Directorate
LBB	leak-before-break
LCO	limiting condition for operation
LCS	local control station
LCW	low-conductivity waste
LER	Licensee Event Report
LHGR	linear heat generation rate
LLRT	local leak rate test
LOCA	loss-of-coolant accident
LOLA	loss of large areas
LOOP	loss of offsite power
LP	low pressure
LP-FWH	low pressure feedwater heater
LPSD	low power and shutdown
LPZ	low population zone
LRA	lower riser assembly
LRF	large release frequency
LRVP	liquid ring vacuum pump
LRW	liquid radioactive waste
LRWS	liquid radioactive waste system, liquid radwaste system
LSH	level switch, high
LSL	level switch, low
Acronym or Abbreviation	Description
LSSS	limiting safety system setting
LTC	load manual tap changers
LTCC	long-term core cooling
LTOP	low temperature overpressure protection
LUHS	loss of normal access to the ultimate heat sink
LWMS	liquid waste management system
LWR	light water reactor
MAE	module assembly equipment
MC	main condenser
MCC	motor control center
MCHFR	minimum critical heat flux ratio
MCR	main control room
MCS	module control system
MCYR	module critical year
MEL	master equipment list
MEMS	meteorological and environmental monitoring system
MFW	main feedwater
MHA	maximum hypothetical accident
MHS	module heatup system
MIB	monitoring and indication bus
MIC	microbiologically induced corrosion
MIT	Massachusetts Institute of Technology
MLA	module lifting adapter
MLD	master logic diagram
MM	multiple, multi-module
MMAF	multi-module adjustment factor
MMI	multi-module issue
MMPSF	multi-module performance shaping factor
MMS	moment magnitude scale
MOC	middle of cycle
MOV	motor-operated valve
MPS	module protection system
MPT	main power transformer
MPU	magnetic speed pickup
MSI	main steam isolation
MSIBV	main steam isolation bypass valves
MSIV	main steam isolation valve
MSLB	main steam line break
MSO	multiple spurious operations
MSPB	main steam pipe break
MSPI	mitigating system performance index
MSS	main steam system
MSSV	main steam safety valve
MTC	moderator temperature coefficient
MTU	metric tons, uranium
MWe	megawatt electric
MWS	maintenance workstation
MWt	megawatt thermal
N/A	Not Applicable
NDE	non-destructive examination
Acronym or Abbreviation	Description
NDS	nitrogen distribution system
NDT	non-destructive testing
NEI	Nuclear Energy Institute
NERC	North American Electric Reliability Corporation
NFA	new fuel assembly
NFE	new fuel elevator
NFJC	new fuel jib crane
NFPA	National Fire Protection Association
NIC	network interface controller
NIST	National Institute of Standards and Technology
NIST-1	NuScale Integral System Test Facility
NMS	neutron monitoring system
NOG	nuclear overhead and gantry
NPM	NuScale Power Module
NPP	NuScale Power Plant
NPS	nominal pipe size
NPSH	net positive suction head
NRC	Nuclear Regulatory Commission
NRF	nuclear reliability factor
NSA	neutron source assembly
NSAC	Nuclear Safety Analysis Center
NSSS	nuclear steam supply system
NTTF	Near-Term Task Force
OBE	operating basis earthquake
OCS	operational condition sampling
OD	outside diameter
ODC	overspeed detection circuit
ODCM	Offsite Dose Calculation Manual
OE	operating experience
OER	operating experience review
OHLHS	overhead heavy load handling system
ORNL	Oak Ridge National Laboratory
ORPP	Operational Radiation Protection Program
OSC	operational support center
OSHA	Occupational Safety and Health Administration
OSP	overspeed protection system
OSU	Oregon State University
P&ID	piping and instrumentation diagram
PA	protected area
PA/GA	public address/general alarm
PACS	priority actuation and control system
PAM	post-accident monitoring
PBX	private branch exchange
PCA	primary coolant activity
PCCV	prestressed concrete containment vessel
PCP	Process Control Program
PCS	非能动安全壳冷却系统（Passive Containment Cooling System，PCS）； plant control system
PCT	peak cladding temperature
PCUS	pool cleanup system
PDC	power distribution center
Acronym or Abbreviation	Description
PDC	principal design criteria
PDIL	power dependent insertion limit
PDIT	differential pressure indicating transmitter
PFT	process feed tank
PGA	peak ground acceleration
pHT	concentration of H+ ion on a logarithmic scale (temperature dependent)
PID	proportional integral derivative
PING	particulate, iodine, and noble gas
PIRT	phenomena identification and ranking table
PIT	pressure indicating transmitter
PLC	programmable logic controller
PLD	pool leakage detection
PLDD	programmable logic design description
PLDP	Programmable Logic Development Plan
PLDS	pool leakage detection system
PLHGR	peak linear heat generation rate
PLM	priority logic module
PLRS	programmable logic requirement specification
PLS	plant lighting system
PLVVP	Programmable Logic Verification and Validation Plan
PMF	probable maximum flood
PMP	probable maximum precipitation
PORV	power-operated relief valve
POS	plant operating state
POV	power-operated valve
PPE	personnel protective equipment
PPS	plant protection system
PRA	probabilistic risk assessment
PRV	pressure relief valve
PSCIV	primary system containment isolation valves
PSCS	pool surge control system
PSD	power spectra density
PSMS	power supply monitoring system
PSS	process sampling system
PST	phase separator tank
PSTN	public switched telephone network
PTAC	performance and test acceptance criteria band
PTS	pressurized thermal shock
PVC	polyvinyl chloride
PVMS	plant-wide video monitoring system
PWHT	post-weld heat treatment
PWR	pressurized water reactor
PWS	potable water system
PWSCC	primary water stress-corrosion cracking
PZR	pressurizer
QA	quality assurance
QAP	Quality Assurance Program
QAPD	Quality Assurance Program Description
QPD	quadrant power difference
QD	quick disconnect
Acronym or Abbreviation	Description
QPF	quadrant power fractions
RAI	request for additional information
RAP	Reliability Assurance Program
RAW	risk achievement worth
RBC	Reactor Building crane
RBCM	Reactor Building components
RBVS	Reactor Building HVAC system
RCA	radiologically controlled area
RCCA	rod control cluster assembly
RCCWS	reactor component cooling water system
RCP	reactor coolant pump
RCPB	reactor coolant pressure boundary
RCRA	Resource Conservation and Recovery Act
RCS	reactor coolant system
RDT	reactor drain tank
REA	rod ejection accident
RETS	Radiological Effluent Technical Specifications
RFI	radio frequency interference
RFP	refueling pool
RFT	reactor flange tool
RG	Regulatory Guide
RHR	residual heat removal
RHX	regenerative heat exchanger
RIS	regulatory issue summary
RLE	review level earthquake
RM	radiation monitoring
RMS	fixed area radiation monitoring system
RMTS	risk-managed technical specifications
RO	reverse osmosis
ROP	Reactor Oversight Process
RPCS	reactor pool cooling system
RPI	rod position indication
RPS	reactor protection system
RPV	reactor pressure vessel
RRS	required response spectrum
RRV	reactor recirculation valve
RSA	remote shutdown area
RSR	results summary report
RSS	remote shutdown station
RSV	reactor safety valve
RTB	reactor trip breaker
RTD	resistance temperature detector
RTM	requirements traceability matrix
RTNDT	reference temperature for nil-ductility transition
RTNSS	regulatory treatment of nonsafety systems
RTP	rated thermal power
RTPTS	reference temperature, pressurized thermal shock
RTS	reactor trip system
RVI	reactor vessel internals
RVV	reactor vent valve
Acronym or Abbreviation	Description
RWB	Radioactive Waste Building
RWBCR	Radioactive Waste Building control room
RWBVS	Radioactive Waste Building HVAC system
RWDS	radioactive waste drain system
RWMS	radioactive waste management system
RWSS	raw water supply system
RXB	Reactor Building
RXC	reactor core
S&Q	staffing and qualifications
SAFDL	specified acceptable fuel design limit
SAM	seismic anchor motion
SAMDA	severe accident mitigation design alternative
SAMG	severe accident management guideline
SAR	Safety Analysis Report
SAS	secondary alarm station
SAS	service air system
SAT	site acceptance testing
SBAC	smooth bounding analysis curve
SBLB	subscale boundary layer boiling
SBLOCA	small-break loss-of-coolant accident
SBM	scheduling and bypass module
SBO	station blackout
SBVS	Security Building HVAC system
SC-I	Seismic Category I
SC-II	Seismic Category II
SC-III	Seismic Category III
SCB	Security Buildings
SCC	stress corrosion-cracking
SCDF	seismic core damage frequency
SCR	silicon controlled rectifier
SCR	SCRAM load
SCS	secondary sampling system
SCWS	site cooling water system
SDB	safety data bus
SDIS	safety display and indication system
SDM	shutdown margin
SDOE	secure development and operational environment
SDOF	single-degree-of-freedom
SDP	software development process
SDS	site drainage system
SEB	Security Building
SECS	plant security system
SECY	Secretary of the Commission, Office of the NRC
SEI	Structural Engineering Institute
SEL	seismic equipment list
SER	Safety Evaluation Report
SFA	spent fuel assembly
SFM	safety function module
SFP	spent fuel pool
SFPCS	spent fuel pool cooling system
Acronym or Abbreviation	Description
SFSS	spent fuel storage system
SG	separation group
SG	steam generator
SG	strain gauge
SGI	safeguards information
SGS	steam generator system
SGTF	steam generator tube failure
SICS	safety information and control system
SIL	software integrity level
SLB	steam line break
SLP	site layout plan
SM	single module
SMA	seismic margin assessment
SMACNA	Sheet Metal and Air Conditioning Contractors’ National Association
SME	subject matter expert
SMR	small modular reactor
SMS	seismic monitoring system
SNL	Sandia National Laboratories
SNM	special nuclear material
SOCA	security owner controlled area
SOV	solenoid-operated valve
SPAR	standardized plant analysis risk
SPND	self-powered neutron detector
SPS	security power system
SQDP	seismic qualification data package
SQRF	seismic qualification record form
SQUG	Seismic Qualification Utility Group
SR	surveillance requirement
SREC	standard radiological effluent control
SRI	Stanford Research Institute
SRM	staff requirements memorandum
SRP	Standard Review Plan
SRSS	square root of the sum of the squares
SRST	spent resin storage tank
SRV	sump recirculation valve
SRWS	solid radioactive waste system
SSA	safe shutdown analysis
SSC	structures, systems, and components
SSCIV	secondary system containment isolation valve
SSE	safe shutdown earthquake
SSI	soil-structure interaction or secondary system isolation
SSS	secondary sampling system
SSSI	structure-soil-structure interaction
SST	station service transformer
STPA	System-Theoretic Process Analysis
SUNSI	sensitive unclassified non-safeguards information
SVM	schedule and voting module
SWIS	service water intake structure
SWMS	solid waste management system
SWV	shear wave velocity
Acronym or Abbreviation	Description
SWYD	switchyard system
TA	task analysis
TAF	top of active fuel
TBC	Turbine Building crane
TBS	turbine bypass system
TBVS	Turbine Building HVAC system
T/C	thermocouple
TCU	temperature control unit
TDH	total dynamic head
TDS	total dissolved solids
TEDE	total effective dose equivalent
TGB	Turbine Generator Building
TGS	turbine generator system
TGSS	turbine gland sealing system
THD	total harmonic distortion
TIHA	treatment of important human actions
TIT	temperature indicating transmitter
TLD	thermoluminescent dosimeter
TLOSS	turbine lube oil storage system
TMI	Three Mile Island
TMR	triple module redundancy
TNDT	nil ductility temperature
TOC	top of concrete
TRS	test response spectrum
TS	technical specifications
TSC	technical support center
TSTF	Technical Specification Task Force
TUF	tubular ultrafiltration
UAT	unit auxiliary transformer
UCRW	uncontrolled control rod assembly withdrawal at power
UCRWS	uncontrolled control rod assembly withdrawal from a subcritical or low power or startup condition
UDC	uniform Doppler coefficient
UHS	ultimate heat sink
UPS	uninterruptible power supply
URD	Utility Requirements Document
URS	uniform response spectrum
URS	upper riser assembly/section
USGS	United States Geological Survey
USI	unresolved safety issue
USM	uniform support motion
UTC	coordinated universal time
UWS	utility water system
V&V	verification and validation
VDU	video display unit
VIT	vibration indicating transmitter
VLA	vented lead-acid
VRLA	valve-regulated lead-acid
VRT	voltage regulating transformer
WDT	watchdog timer
WMCR	waste management control room
Acronym or Abbreviation	Description
WSW	wet solid waste
WTB	Waste Treatment Building
ZOI	Zone of Influence
ZPA	zero period acceleration