Acronyms (Diablo Canyon Independent Safety Committee)

Acronyms used at Diablo Canyon Nuclear Power Plant (DCPP)

The following alphabetical listing contains abbreviations, acronyms, compound words, technical symbols, and spelling preferred for licensing and other regulatory correspondence.

Letter	Acronym	Definition
A	AMSAC	ATWS mitigation system actuation circuitry
A	Abs	Absolute
A	ASP	Accident sequence precursor (PRA term)
A	Acre-ft	Acre-foot
A	AE	Action Evaluation
A	AR	Action Request
A	ALJ	Administrative Law Judge
A	AL	Administrative Letter (NRC)
A	ACRS	Advisory Committee on Reactor Safeguards
A		Aftercooler
A		Air-cooled
A		All-inclusive
A	AVT	All volatile treatment
A	AOT	Allowed outage time
A	ARC	Alternate repair criteria
A	Ac	Alternating current
A	ACI	American Concrete Institute
A	AIEE	American Institute of Electrical Engineers
A	AISC	American Institute of Steel Construction
A	ANSI	American National Standards Institute
A	ANEC	American Nuclear Energy Council
A	ANI	American Nuclear Insurers
A	ANS	American Nuclear Society
A	API	American Petroleum Institute
A	ASTM	American Society for Testing and Materials
A	ASCE	American Society of Civil Engineers
A	ASME	American Society of Mechanical Engineers
A	ASA	American Standards Association
A	AWS	American Welding Society
A	AWG	American wire gauge
A	A/amp	Ampere
A	A-hr/amp-hr	Ampere-hour
A	A/cm2	Ampere per square centimeter
A	AM	Amplitude modulation
A	A.m.	Ante meridiem-before noon
A	ATWS	Anticipated transient without scram
A	ATWT	Anticipated transient without trip
A	Antilog/log-1	Antilogarithm
A		Antireverse
A	AVB	Antivibration bar
A		As-built (adj or noun)
A	ALARA	As low as is reasonably achievable
A	Atm	Atmosphere
A	AEC	Atomic Energy Commission
A	AIF	Atomic Industrial Forum
A	ASLAB	Atomic Safety and Licensing Appeal Board
A	ASLB	Atomic Safety and Licensing Board
A	At. no.	Atomic number
A	At. %	Atomic percent
A	At. wt	Atomic weight
A	AFR	Audit Finding Report
A	AIT	Augmented inspection team (NRC)
A	ANI	Authorized Nuclear Inspector
A	ACI	Autoclosure interlock
A		Autostart
A		Autostop
A	AB	Auxiliary building
A	AFW	Auxiliary feedwater
A	ASW	Auxiliary saltwater
A	Avg	Average
A	AO	Axial offset
A	AOC	Axial offset control
B	BN	Board Notification
B	B&PV	Boiler and Pressure Vessel (Code)
B	BTP	Branch Technical Position (NRC)
B	Btu	British thermal unit
C	CDFG	California Department of Fish and Game
C	CDF	California Department of Forestry
C	CDMG	California Division of Mines and Geology
C	CPUC	California Public Utilities Commission
C	CRWQCB	California Regional Water Quality Control Board
C	C	Celsius
C	CCRWQCB	Central Coast Regional Water Quality Control Board
C	C of C	Certificate of Compliance
C	CMTR	Certified Material Test Report
C	CFR	Code of Federal Regulations
C	CRGR	Committee to Review Generic Requirements (NRC)
C	COLR	Core Operating Limits Report
C	CERP	Corporate Emergency Response Plan
C	CIRC	Corporate Incident Response Center
C	CCC	Correspondence control center
D	DLAP	Department-Level Administrative Procedure
D	DOD	Department of Defense
D	DOE	Department of Energy
D	DER	Department of Engineering Research
D	DHS	Department of Health Services (California)
D	DPH	Department of Public Health (county)
D	DOT	Department of Transportation
D	DBM	Design Basis Management
D	DCM	Design Criteria Memorandum
D	DCISC	Diablo Canyon Independent Safety Committee
D	DCL-98-XXX	Diablo Canyon Letter
D	DCPP	Diablo Canyon Nuclear Power Plant
D	DCPRA	Diablo Canyon probabilistic risk assessment
D	DR	Discrepancy Report or Deviation Report
D	D.C.	District of Columbia
D	DC	District of Columbia (in address with zipcode)
D	DPR	Division of Power Reactors (AEC)
D	DES	Draft Environmental Statement (NRC)
E	EEI	Edison Electric Institute
E	EPRI	Electric Power Research Institute
E	EOC	Emergency Operations Center
E	EOF	Emergency Operations Facility
E	ERF	Emergency Response Facility
E	ERFDS	Emergency Response Facility Data System
E	ERMC	Emergency Response Media Center
E	ERP	Emergency Response Plan
E	ES (also OES)	Emergency Services, California Office of
E	EIC	Energy Information Center
E	ERDA	Energy Research and Development Administration
E	ES	Engineering Services
E	EIS	Environmental Impact Statement
E	EPA	Environmental Protection Agency (U.S. government)
E	EPP	Environmental Protection Plan
E	ER	Environmental Report
E	EIT	Event Investigation Team
E	ERT	Event Response Team
E	EDO	Executive Director for Operations (NRC)
F	F	Fahrenheit
F	f	Farad
F	FEMA	Federal Emergency Management Administration
F	FERC	Federal Energy Regulatory Commission
F	FR	Federal Register
F	FWPCA	Federal Water Pollution Control Act
F	FWQA	Federal Water Quality Act
F	FES	Final Environmental Statement
F	FSAR	Final Safety Analysis Report
F	FPP	Fire Protection Program
F	FTI	Framatome Technologies, Inc.
F	FOIA	Freedom of Information Act
G	GL	Generic Letter
H	HWMP	Hazardous Waste Minimization Program
H	HIT	High Impact Team
H	HI-STAR	Holtec International Storage, Transport and Repository
H	HI-STORM	Holtec International Storage and Transfer Operation Reinforced Module
H	HE	Hosgri earthquake
H	HBL-98-XXX	Humboldt Bay Letter
H	HBPP	Humboldt Bay Power Plant
I	Ibid.	Ibidem (in the same place)
I	ITS	Improved Technical Specifications
I	IDVP	Independent Design Verification Program
I	ISC	Independent Safety Committee
I	IR	Inspection Report (NRC)
I	IEEE	Institute of Electrical and Electronics Engineers
I	INPO	Institute of Nuclear Power Operations
I	ISA	Instrument Society of America
I	IIT	Integrated Inspection Team
I	ISAP	Integrated Safety Assessment Program
I	IDAP	Inter-Departmental Administrative Procedure
I	ICRP	International Commission on Radiation Protection
I	SI	International System of Units (Standard International)
J	JCAE	Joint Committee on Atomic Energy
J	JMC	Joint Media Center
L	LER	Licensee Event Report
L	LIS	Licensing Information Service
L	LDBAP	Licensing and Design Bases Alignment Program
L	LTSP	Long Term Seismic Program
L	LPMS	Loose Parts Monitor System
M	MAS	Management Action System (PIMS)
M	MM	Mechanical Maintenance
M		Mode 2 (Startup)
M		Mode 3 (Hot Standby)
M		Mode 4 (Hot Shutdown)
M		Mode 5 (Cold Shutdown)
M		Mode 6 (Refueling)
M		Mode l (Power Operation)
M	MAAP	Modular Accident Analysis Program
M	MFP	Mothers for Peace
N	NBFU	National Board of Fire Underwriters
N	NBS	National Bureau of Standards
N	NEC	National Electric Code
N	NEMA	National Electrical Manufacturer's Association
N	NEPA	National Environmental Policy Act
N	NFPA	National Fire Protection Association
N	NFPC	National Fire Protection Code
N	NPDES	National Pollutant Discharge Elimination System
N	NCR	Nonconformance Report
N	NOD	Notice of Deviation
N	NOV	Notice of Violation
N	NEI	Nuclear Energy Institute
N	NEI-98-XXX	Nuclear Energy Institute Letter
N	NUMARC	Nuclear Management and Resources Council
N	NMSS	Nuclear Material Safety and Safeguards (NRC)
N	NPAP	Nuclear Plant Administrative Procedure
N	NPPR	Nuclear Plant Problem Report
N	NPRDS	Nuclear Plant Reliability Data System
N	NPG	Nuclear Power Generation
N	NQS	Nuclear Quality Services
N	NRR	Nuclear Reactor Regulation (NRC)
N	NSOC	Nuclear Safety Oversight Committee
N	NTS	Nuclear Technical Services
N	NUFPG	Nuclear Utility Fire Protection Group
O	OSHA	Occupational Safety and Health Administration
O	AEOD	Office for the Analysis and Evaluation of Operational Data (NRC)
O	OES (also ES)	Office of Emergency Services (State)
O	OIE or IE	Office of Inspection and Enforcement (State)
O	IG	Office of Inspector General (NRC)
O	NMSS	Office of Nuclear Material Safety and Safeguards (NRC)
O	ODES	Onsite Dosimetry and Environmental Services
O	OMMS	Onsite Meteorological Monitoring System
O	OTSC	Onsite Technical Support Center
O	ORAT	Operational Readiness Assessment Team (NRC)
O	OSC	Operational Support Center
P	PIP	Performance Incentive Plan
P	PRP	Performance Recognition Program
P	PSER	Physical Security Event Report
P	PSP	Physical Security Plan
P	PIMS	Plant Information Management System
P	PIM	Plant Issues Matrix (NRC)
P	PSRC	Plant Staff Review Committee
P	PSDAR	Post-Shutdown Decommissioning Activities Report
P	PSAR	Preliminary Safety Analysis Report
P	PNAC	President's Nuclear Advisory Committee
P	PVRC	Pressure Vessel Research Committee
P	PCP	Process Control Program
P	PD	Program Directive
P	PAG	Protective Action Guide (exposure limits)
P	PDR	Public Document Room
P	PSD	Public Staff Division (of CPUC
P	PUC	Public Utilities Commission
Q		Q-List (classification listing of structures, systems, and components)
Q	QAPR	Quality Assurance Problem Report
Q	QE	Quality Evaluation
Q		Quality Hotline
Q	QPAR	Quality Performance Assessment Report
Q	QPR	Quality Problem Report
Q	QPSR	Quality Problem Status Report
R	RETS	Radiological Effluent Technical Specifications
R	REMP	Radiological Environmental Monitoring Program
R	RRS	Radiological and Radwaste Services
R	RATI	Readiness Assessment Team Inspection (NRC)
R		Region IV (NRC)
R	RWQCB	Regional Water Quality Control Board
R	RG, Reg Guide	Regulatory Guide
R	RRG	Regulatory Review Group (NRC)
R	RS	Regulatory Services
R	RE	Resident Engineer (NRC)
R	RCRA	Resource Conservation Recovery Act
R	R	Roentgen
R	Rem	Roentgen equivalent man
R	R/hr	Roentgens per hour
R	R/min	Roentgens per minute
S	SCP	Safeguards Contingency Plan
S	SER	Safety Evaluation Report
S	SECY	Secretary (of NRC) papers
S	SEC	Securities and Exchange Commission
S	SIR	Security Incident Report
S	SISIP	Seismically Induced Systems Interaction Program
S	SPPR	Semiannual Plant Performance Review (NRC)
S	SRO	Senior Reactor Operator
S		Severity Level I, II, III, IV, V violation
S	STA	Shift Technical Advisor
S	SOER	Significant Operating Event Report (INPO)
S	SFPE	Society of Fire Protection Engineers
S	SR	Special Report
S	SWP	Special Work Permit
S	SFPO	Spent Fuel Project Office (NRC)
S	SRM	Staff Requirements Memorandum (NRC)
S		Staff (use initial cap when referring to NRC)
S	SP	Standard Practice
S	SRP	Standard Review Plan
S	STS	Standard Technical Specifications
S	ES (also OES)	State Office of Emergency Services
S	SEAOC	Structural Engineering Association of California
S	SSPC	Structural Steel Painting Council
S	SSER	Supplement to SER
S	SAFR	Supplier Audit Finding Report
S	SER	Supplier Evaluation Report
S	SALP	Systematic Assessment of Licensee Performance
T	TER	Technical Evaluation Report (NRC)
T	TMS	Technical Maintenance Services
T	TRG	Technical Review Group
T	TS, Tech Spec	Technical Specification
T	TSIP	Technical Specification Improvement Program
T	TSC	Technical Support Center
T	TEMP	Thermal Effects Monitoring Program
T	TSAR	Topical Safety Analysis Report
T	TZ	Transaction Zone
U	USCGS	U.S. Coast and Geodetic Survey
U	USCEA	U.S. Council for Energy Awareness
U	USGS	U.S. Geological Survey
U	UL	Underwriters Laboratory
U	UBC	Uniform Building Code
U	UFC	Uniform Fire Code
U	UPC	Uniform Plumbing Code
V		V-notch (hardness test)
W	W	Westinghouse
W	WEXTEX	Westinghouse Explosive Tube Expansion
W	WOG	Westinghouse Owners Group
W	WANO	World Association of Nuclear Operators
B		backdraft
B		backflow
B		backpressure
B		backseat (valves)
B		backup (noun or adj), back up (verb)
B	BOP	balance-of-plant
B	bbl/d	barrel per day
B	bbl	barrel(s)
B		base load
B		basemat
B		baseplate
B	BEPZ	basic emergency planning zone
B		bedrock
B	BOL	beginning of life
B		beltline
B		beyond-design-basis (accident)
B		biaxial
B		bidirectional
B	BeV	billion electron volts
B		bistable
B		biweekly
B		blowdown
B		blueprint
B	bp	boiling point
B	BWR	boiling water reactor
B		boiloff
B	BCMS	boron concentration measurement system
B	BCMS	boron concentration monitoring system
B	BIT	boron injection tank
B	BHP	brake horsepower
B		breakwater
B	bldg	building
B		buildup (noun or adj), build up (verb)
B		built-in (adj)
B		burnup (noun or adj), burn up (verb)
B		bypass
C	calc	calculation
C	cal	calorie
C	CRT	cathode-ray tube
C	CSAT	caustic spray additive tank
C		centerline
C	cm	centimeter(s)
C	cm/sec	centimeters per second
C	CCP	centrifugal charging pump
C	CTE	change, test, or experiment
C		changeout (noun or adj), change out (verb)
C		checkerplate
C		checklist
C	CVCS	chemical and volume control system
C	C&RP	chemistry and radiation protection
C		cleanup (noun or adj), clean up (verb)
C	CCTV	closed circuit television
C		closeout (noun or adj), close out (verb)
C		coastdown (noun or adj), coast down (verb)
C	coeff	coefficient
C		cogenerate
C		cold leg
C	CLT	cold leg thinning
C	CWF	cold wall factor
C	CZP	cold zero power
C	CCS	commitment control system
C	CCWS	component cooling water system
C	CFW	condensate and main feedwater
C	CST	condensate storage tank
C	CFCU	containment fan cooler unit
C	CHMS	containment hydrogen monitoring system
C	CHPS	containment hydrogen purge system
C	CSAS	containment spray additive system
C	CSS	containment spray system
C	CVI	containment ventilation isolation
C	CVIS	containment ventilation isolation system
C	CRDM	control rod drive mechanism
C	CRDR	control room design review
C	CRPS	control room pressurization system
C		cooldown (noun or adj), cool down (verb)
C	CDF	core damage frequency
C	CBLA	cost beneficial licensing action
C		cost-benefit
C		cost-effective
C		cost-plus
C		cost-reimbursable
C	C	coulomb
C		countercurrent
C	cpm	counts per minute
C	CHF	critical heat flux
C		cross-check
C		cross flow
C		cross-reference
C		cross-section (adj), cross section (noun)
C		crossbar
C		crosstie
C		crosswind
C	cc (or cm3)	cubic centimeter
C	cfh (or ft3/hr)	cubic feet per hour
C	cfm (or ft3/min)	cubic feet per minute
C	cfs (or ft3/sec)	cubic feet per second
C	cu ft (or ft3)	cubic foot
C	cu in. (or in.3)	cubic inch
C	cu m (or m3)	cubic meter
C	cu mm (or mm3)	cubic millimeter
C	cu yd (or yd3)	cubic yard
C	Ci	curie
C		cutoff (noun or adj), cut off (verb)
C	Hz or cps	cycles per second
D		database
D		deborate
D	dB	decibel
D		defense-in-depth
D		defoaming
D	DOF	degree-of-freedom
D	Anddeg; or deg	degree (plane angle)
D	Canddeg;;Canddeg;	degrees Celsius; Celsius degrees (for temperature change or difference)
D	Fanddeg;;Fanddeg;	degrees Fahrenheit; Fahrenheit degrees (for temperature change or difference)
D	K (anddeg; not used)	degrees Kelvin (absolute)
D	Anddeg;R	degrees Rankine
D		demultiplexer
D	DNB	departure from nucleate boiling
D	DNBR	departure from nucleate boiling ratio
D	DBA	design basis accident
D	DBD	design basis document
D	DBE	design basis earthquake
D	DBT	design basis threat
D	DBV	design basis vehicle
D	DCN	design change notice
D	DCP	design change package
D	DCR	design change request
D	DE	design earthquake
D	DFE	design flood event
D		dew point
D		dewater
D	DET	diagnostic evaluation team (NRC)
D	dia	diameter
D	DEG	diesel engine generator
D	DG or D/G	diesel generator
D	DBW	differential boron worth
D	DP or delta P	differential pressure
D	DPV	differing point of view (NRC)
D	DPO	differing professional opinion (NRC)
D	DRPI	digital rod position indicator
D	dc	direct current
D	dpm	disintegrations per minute
D	dps	disintegrations per second
D	DTC	doppler temperature coefficient
D	DDE	double design earthquake
D	DER	double-ended rupture
D		down time
D		downstream
D		downwind
D		drawdown (noun or adj), draw down (verb)
D	DLF	dynamic load factor
D	dyn	dyne
E	EWS	early warning system
E	EFPD	effective full power days
E	EFPH	effective full power hours
E	EFPY	effective full power year
E	EMF	effective multiplication factor
E	eff	efficiency
E	EDM	electrode discharge machining
E	EH	electrohydraulic
E	EMI	electromagnetic interference
E	emp	electromagnetic pulse
E	emu	electromagnetic units
E	emf	electromotive force
E	e	electron
E	e.u.	electron units
E	eV	electron volt
E	EDMS	electronic document management system
E		electrosleeving
E	esu	electrostatic units
E	el	elevation
E	EARS	emergency assessment and response system
E	ECCS	emergency core cooling system
E	EDG	emergency diesel generator
E	ENS	emergency notification system
E	EOP	emergency operating procedure
E	EPZ	emergency planning zone
E	EPS	emergency power system
E	EOC	end of cycle
E	EOL	end of life
E		endpoint
E	ESF	engineered safety feature
E	ESFAS	engineered safety features actuation system
E	EAC	engineering advisory committee
E	ECN	engineering change notice
E	ECO	engineering change order
E	EWR	engineering work request
E	EQ	environmental qualification
E	ECG	equipment control guidelines
E	EFPY	equivalent full power years
E	est	estimate
E	(and others)	et al
E	etc.	et cetera (and so forth)
E	et seq.	et sequentes (and the following)
E	EAB	exclusion area boundary
E	e.g.	exempli gratia (for example)
E	exp	exponent, exponential
F	fab	fabricate
F	FAI	fail-as-is
F	FC	fail-closed
F	FO	fail-open
F		fail-safe
F	FMEA	failure modes and effects analysis
F		feedwater
F	FLB	feedwater line break
F	ft	feet
F	fpm	feet per minute
F	fps	feet per second
F	FCN	field change notice
F	FCO	field change order
F	FCR	field change request
F	FCT	field change transmittal
F	FCT	field correction transmittal
F	FDR	field deficiency report
F		field-fabricated
F	FIR	field installation request
F		field-routed
F		field-run
F	fig.	figure (capitalize when specified)
F	FHARE	fire hazards Appendix R evaluations
F	FPS	fire protection system
F		fire water
F	FWST	fire water storage tank
F		first-line (adj)
F		fishplate
F		fixed-fee (adj)
F	FCV	flow control valve
F	FD	flow diagram
F	FIT	flow-indicating transmitter
F	FI	flow indicator
F		flow-induced
F	FT	flow transmitter
F		flowmeter
F		flowpath
F		flowrate
F		follow-up (noun or adj), follow up (verb)
F	ft	foot, feet
F	ft-lb	foot-pound
F	ft-kip	foot-pound (thousands)
F	FMEA	foreign material exclusion area
F		fossil-fueled (preferred over fossil-fired)
F	fdn	foundation
F	fp	freezing point
F	freq	frequency
F	FM	frequency modulation
F	FHB	fuel handling building
F		fuel-to-cladding
F		full-length (adj)
F		full power (noun and adj)
F		full-scale (adj)
F		full-size (adj)
F		full-time (adj), full time (adverb)
G	gal.	gallon(s)
G	gpd	gallons per day
G	gph	gallons per hour
G	gpm	gallons per minute
G	gps	gallons per second
G	GTAW	gas tungsten arc welding
G	G	gauss (unit of magnetic flux density)
G	GDC	general design criterion
G	GSI	generic safety issue
G	G	giga- (10 9) (prefix)
G	GHz	gigahertz
G	GW	gigawatt
G	GWh	gigawatt-hour
G	GV	governor valve
G	g-cal	gram-calorie
G	gf	gram-force
G	gmv	gram-molecular volume
G	g	gram(s)
G	g/cm3	grams per cubic centimeter
G	g/L	grams per liter
G	g	gravity, acceleration of
G	GFFD	gross failed fuel detector
G		groundwater
H		half-life
H	HCV	hand control valve
H		hands-on
H	hav	haversine
H	hdr	header
H	HX	heat exchanger
H		heat-treated
H	htr	heater
H	HVAC	heating, ventilating, and air conditioning
H		heatup (noun or adj), heat up (verb)
H		heavy-duty (adj), heavy duty (noun)
H	H	henry
H	Hz	hertz (cycles per second)
H	HCLPF	high-confidence-of-low-probability-of-failure
H		high-density (adj)
H	HEPA	high-efficiency particulate air (filter)
H		high-energy (adj)
H	HELB	high-energy line break
H	hf	high-frequency (adj)
H		high-level (adj)
H	HP	high-pressure (adj)
H	HPCI	high pressure coolant injection
H	HPSI	high pressure safety injection
H		high-temperature (adj)
H	HTR	high temperature resistant
H	hv	high-voltage (adj)
H		holddown (noun or adj), hold down (verb)
H		holdup (noun or adj), hold up (verb)
H	hp	horsepower
H	HCF	hot channel factor
H	HFT	hot functional test
H		hot leg
H		hotwell
H	hr	hour(s)
H	HPES	human performance evaluation system
H		hydroelectric
H	pH	hydrogen ion concentration
H		hydrotesting
I	i.e.	id est (that is)
I	id.	idem (the same)
I	ITS	important to safety
I		in-depth (adj), in depth (adv)
I		in-house (adj)
I		in-leakage
I		in-line (adj)
I		in-phase (adj)
I		in-place (adj)
I		in-plant (adj)
I		in process
I		in progress
I		in situ
I	in.	inch(es)
I	in. /s	inches per second
I		incore
I	ISFSI	independent spent fuel storage installation
I	ITR	independent technical reviewer
I	IPE	individual plant examination
I	IPEEE	individual plant examination for external events
I	IN	information notice
I		inservice
I	ISI	inservice inspection
I	ILT	inservice leak test
I	IST	inservice testing
I	ID	inside diameter
I	I&C	instrumentation and controls
I		intake structure
I	ICS	integrated communications system
I	ILRT	integrated leak rate test
I	ILS	integrated living schedule
I	IPAP	integrated performance assessment process (NRC)
I		inter alia (among other things)
I	IGA	intergranular attack
I	IGSCC	intergranular stress corrosion cracking
I	IOM	interoffice memorandum
I		intertidal
I		isophase
I	INVDIO	issue needing validation to determine its impact on operability
J		jobsite
J	J	joule
J	JCO	justification for continued operation
K	k	kilo- (103) (prefix)
K	kandOmega;	kilo-ohm
K	kcal	kilocalorie
K	kCi	kilocurie
K	kc	kilocycle
K	kHz or kc/sec	kilocycles per second
K	keV	kiloelectron volt
K	kG	kilogauss
K	kg	kilogram(s)
K	kg/m3	kilograms per cubic meter
K	kHz	kilohertz
K	kJ	kilojoule
K	kL	kiloliter
K	km	kilometer(s)
K	km/s	kilometers per second
K	kVARh	kilovar hour
K	kVAR	kilovar (reactive kilovolt-ampere)
K	kV	kilovolt
K	kVA	kilovolt-ampere
K	kVAh	kilovolt-ampere hour
K	kW	kilowatt
K	kWe	kilowatt (electric)
K	kWh	kilowatt-hour
K	kWt	kilowatt (thermal)
K	KE or T	kinetic energy
K	kip	kip (1000 lb)
L		large-bore (adj)
L	LERF	large early release frequency
L		large-scale (adj)
L	lat	latitude
L		laydown
L	Pb	lead (element)
L		lead time
L		leakoff (noun or adj), leak off (verb)
L		leakrate
L		leaktight
L		leaktightness
L		letdown (noun or adj), let down (verb)
L	LCV	level control valve
L	LI	level indicator
L	LS	level sensor
L	LT	level transmitter
L	LAR	license amendment request
L	LB	licensing basis
L	LBIE	licensing basis impact evaluation (50.59 evaluation)
L		life-support (adj)
L	LED	light emitting diode
L	LS	limit switch
L	LCO	limiting condition for operation
L	lf	linear feet
L	LVDT	linear variable differential transformer
L	L	liter(s)
L	LL	live load
L		loadout (noun or adj), load out (verb)
L	LLRT	local leak rate test
L	log (ln)	logarithm (natural)
L		long-term (adj)
L	long.	longitude
L	LOCA	loss-of-coolant accident
L	LOOP	loss of offsite power
L		low-level (adj)
L	LLW	low-level waste (but: very low level waste)
L		low-low
L	LPZ	low population zone
L	LPD	low power density
L	LP	low-pressure (adj)
L	LSA	low specific activity
L	LTOP	low temperature overpressure protection
L	LLD	lower limits of detection
L		lumenlm
L	lm/W	lumens per watt
L		lump-sum (adj)
M	MT	magnetic particle test
M	MCES	main condenser evacuation system
M	MCB	main control board
M	MFW	main feedwater
M	MFWP	main feedwater pump
M	MSIV	main steam isolation valve
M	MSLB	main steam line break
M	MSSS	main steam supply system
M		makeup (noun, adj), make up (verb)
M		man-rem
M	mgr	manager
M		manhour
M		manpower
M	mfg	manufacturing
M		manways
M		margin of safety
M		markup (noun), marked-up (adj)
M	max	maximum
M	MPC	maximum permissible concentration
M	Mx	maxwell
M	MLLW	mean lower low water
M	MSL	mean sea level
M	M&TE	measurement and test equipment
M	mech	mechanical
M	M	mega- (106) (prefix)
M	MCi	megacurie
M	Mc	megacycle
M	MHz	megahertz (megacycles per second)
M	MV	megavolt
M	MVA	megavolt-ampere
M	MW	megawatt
M	MWd/kgU or MWD/KGU	megawatt days per kilogram of uranium
M	MWd/mtU or MWD/MTU	megawatt days per metric ton of uranium
M	MWe	megawatt, electrical
M	MWh	megawatt-hour
M	MWt	megawatt, thermal
M	MO	megohm
M	MOA	memorandum of agreement (NRC)
M		metalclad
M	MKS	meter-kilogram-second (system of units)
M	m	meter(s)
M	m/s	meters per second
M		mho
M	:	micro- (10-6) (prefix)
M	:A	microampere
M	:A	microangstrom
M	:C	microcoulomb
M	:Ci	microcurie
M	:F	microfarad
M	:g	microgram
M	:H	microhenry
M	:L	microliter
M	:m	micrometer
M	:mho	micromho
M	::	micromicron (10-12 m)
M	:M or :mol	micromole
M	:	micron (10-6 m)
M	:s	microsecond
M	:V	microvolt
M	:W	microwatt
M	MOL	middle of life
M		midloop
M		midpower
M		midrange
M		midscale
M	mph	miles per hour
M	m	milli- (10-3) (prefix)
M	mA	milliampere
M	mCi	millicurie
M	mF	millifarad
M	mg	milligram(s)
M	mH	millihenry
M	mL	milliliter(s)
M	mm	millimeter(s)
M	mmho	millimho
M	MCM	million circular mills
M	MeV	million electron volts
M	MV	million volts
M	mRem	millirem
M	mR	milliroentgen
M	ms	millisecond
M	mV	millivolt
M	mW	milliwatt
M	min	minimum
M	MCHFR	minimum critical heat flux ratio
M	MCPR	minimum critical power ratio
M	min	minute(s)
M	misc	miscellaneous
M	MELB	moderate energy line break
M	MTC	moderator temperature coefficient
M	MSR	moisture separator-reheater
M	mol wt	molecular weight
M	MRS	monitored retrievable storage
M	MCC	motor control center
M	MG	motor generator
M	MOV	motor-operated valve
M		multi-degree-of-freedom
M	MPC	multi-purpose canister
M		multichannel
M		multiconductor
M		multiplex
M		multivariable
N	n	nano- (10-9) (prefix)
N	NR	narrow range
N		near-term (adj)
N	NTOL	near-term operating license
N	NPSH	net positive suction head
N	n/cm 2	neutrons per square centimeter
N	n/cm2 -sec	neutrons per square centimeter per second
N	N	newton
N	NDT	nil ductility temperature
N	N	nitrogen
N	NDD	no detectable degradation
N		no-load (condition)
N		non-1E
N		non-Q
N		nonaccident
N		noncondensable
N		nonconsumable
N	NDE	nondestructive examination
N	NDT	nondestructive testing
N		nonexistent
N		nongaseous
N		nonlinear
N		nonmanual
N		nonmarine
N		nonnuclear
N		nonpositive
N		nonradioactive
N	NPTS	nonradiological permit tracking system
N		nonrecurring
N		nonregenerative
N		nonreversing
N		nonsafety-related
N		nonseismic
N		nonstructural
N		nonunion
N		nonvital
N	NOP	normal operating pressure
N	NOT	normal operating temperature
N	N/C	normally closed
N	N/O	normally open
N	N/A	not applicable
N	NTS	not to scale
N	NIS	nuclear instrumentation system
N	keff or keff	nuclear reactivity
N	NSSS	nuclear steam supply system
N		number(s)no. (nos.)
O		oceanside
O		off-line (adj), off line (adv)
O		offgas
O		offshore
O		offsite
O	AndOmega;	ohm
O	OCB	oil circuit breaker
O	OWS	oil-water separator
O		on-line (adj), on line (adv)
O	OTSC	on-the-spot-change
O		one-dimensional
O		one-half
O		ongoing
O		onshore
O		onsite
O	OE	operability evaluation
O	OBA	operating basis accident
O	OBE	operating basis earthquake
O	OBI	operating basis incident
O	OEA	operating experience assessment
O	OL	operating license
O	OP	operating procedure
O	OVID	operating valve identification diagram
O	O&M	operations and maintenance
O	OOS	out of service
O	OD	outside diameter
O	ODSCC	outside diameter stress corrosion cracking
O		overcurrent
O		overemphasize
O		overpower
O		overpressurization
O		oversized
O	OPC	overspeed protection control
O		overtemperature
O		overvoltage
P	p (pp)	page(s)
P		part-time (adj), part time (adv)
P	PID	partial initial decision
P	PT	particle testing
P	ppb	parts per billion
P	ppm	parts per million
P	Pa	pascal
P		pathway
P	PCT	peak cladding temperature
P	PGA	peak ground acceleration
P	PGV	peak ground velocity
P	PT	penetrant test (dye)
P	%	percent
P	PI	performance indicator
P	PERS	personnel exposure records system
P	p	pico- (10-12) (prefix)
P	pCi	picocurie
P	pF	picofarad
P		piperack
P		pipeway
P	P&IS	piping and instrument schematic
P	P&ID	piping and instrumentation diagram (drawing)
P	PLEX	plant life extension
P	PPR	plant performance review (NRC)
P	PPT	plant performance template (NRC)
P	PPC	plant process computer
P	PPS	plant protection system
P		plant-specific
P	PVC	polyvinyl chloride
P	PCD	population center distance
P	PDP	positive displacement pump
P		post-LOCA
P		post-accident
P	PAM	post-accident monitoring
P	PASS	post-accident sampling system
P	PMT	post-maintenance test
P	p.m.	post meridiem (after noon)
P		post-operational
P		post-tensioned
P	PWHT	post-weld heat treatment
P	PE	potential energy
P	lb	pound(s)
P	psi	pounds per square inch
P	psia	pounds per square inch, absolute
P	psid	pounds per square inch, differential
P	psig	pounds per square inch, gage
P		power block
P	PCB	power circuit breaker
P	PF	power factor
P		power-operated
P	PORV	power(pressure)-operated relief valve
P	PR	power range
P	PRNI	power range nuclear instrument
P		pre-award
P		preaccident
P		preamplifier
P	prefab	prefabricated
P		prefilter
P		preinspect
P		prejob
P		preoperational
P		prepressurization
P	PSI	preservice inspection
P		preset
P	PTLR	pressure and temperature limits report
P	PI	pressure indicator
P	mm Hg	pressure (millimeter of mercury)
P	PS	pressure switch
P	PT	pressure transmitter
P	PTS	pressurized thermal shock
P	PWR	pressurized water reactor
P	PRT	pressurizer relief tank
P	PSRV	pressurizer safety relief valve
P	PM	preventive maintenance
P	PWSCC	primary water stress corrosion cracking
P	PRA	probabilistic risk assessment
P	POD	probability of detection
P	POPCD	probability of prior cycle detection
P	pe	probable error
P	PMF	probable maximum flood
P	PMP	probable maximum precipitation
P		procedure (capitalize when specific)
P	PCD	procedure commitment database
P	POA	prompt operability assessment
P	PAB	protected area boundary
P	PAS	public address system
P		pumpdown
P		punchlist
P	PO	purchase order
Q	QPTR	quadrant power tilt ratio
Q	QTD	quadrant tilt difference
Q	QBL	qualified bidders list
Q	QSL	qualified suppliers list
Q	QAP	quality assurance procedure
Q	QA	quality assurance (when used generically)
Q	QAF	quality audit finding
Q	QC	quality control (when used generically)
R	rad	radian
R	rad/s	radian per second
R	rad	radiation absorbed dose
R	RCA	radiation control access
R	RCP	radiation control procedure
R	RCV	radiation control valve
R	RMS	radiation monitoring system
R	R(P)M	radiation (process) monitor
R	RC	radiochemical
R	RCA	radiological controlled area
R	r	radius
R		radwaste
R	RAM	random-access memory
R		rarefaction
R	RWSR	raw water storage reservoir
R	RCCW	reactor component cooling water
R	RCL	reactor coolant loop
R	RCPB	reactor coolant pressure boundary
R	RCP	reactor coolant pump
R	RCS	reactor coolant system
R	RCIC	reactor core isolation cooling
R	RPS	reactor protection system
R	RTS	reactor testing system
R	RTB	reactor trip breaker
R	RTS	reactor trip system
R	RVHVS	reactor vessel head vent system
R	RVID	reactor vessel integrity database
R	RVLIS	reactor vessel level instrumentation system
R	RVRLIS	reactor vessel refueling level indication system
R	ROM	read-only memory
R		readout
R		real time
R		reanalyze
R		recalibrate
R	RMS	records management system
R		red-line
R		reenergize
R		reevaluate
R	Ref., Refs.	reference(s)
R	RWST	refueling water storage tank
R	RH	relative humidity
R	RAOC	relaxed axial offset control
R	RCM	reliability centered maintenance
R	RPE	replacement parts evaluation
R	RAI	request for additional information (NRC)
R	RFP	request for proposal
R	RRS	required response spectra (equip. testing)
R		reracking
R		rerun
R	RHRS	residual heat removal system
R	RTD	resistance temperature detector
R	RC	responsibility center
R		retrofit
R	rev.	revision
R	rpm	revolutions per minute
R	rps	revolutions per second
R		riprap
R	RCC	rod cluster control
R	RCCA	rod cluster control assembly
R	RPI	rod position indication
R	rms	root mean square
R	RPC	rotating pancake coil
R		runback
R		runoff
R		runup (wave)
S	SSE	safe shutdown earthquake
S	SFAS	safety feature actuation system
S	SIF	safety identification factor
S	SIS	safety injection system
S	SPDS	safety parameter display system
S		safety-related
S	SRV	safety relief valve
S	SV	(safety)(solonoid)(stop) valve
S	SSFAR	safety system functional audit and review
S	SSFI	safety system functional inspection
S	SSOMI	safety system outage modification inspection
S		saltwater
S		seawater
S	SLUR	second level undervoltage relay
S	sec	second(s)
S		section (capitalize when specific)
S	SSI	security safeguards information
S	SAM	seismic anchor movement
S		self-actuated
S		self-contained
S	SCBA	self-contained breathing apparatus
S		semiannually
S		semimonthly
S	SMM	senior management meeting (NRC)
S	SW	service water
S		setpoint
S		shaker-table
S	G	shear modulus
S		shearwall
S		shelf-life
S	SMAW	shielded metal arc welding
S	SFM	shift foreman
S		shop-fabricated
S		shoreline
S		short circuit
S		short-term (adj)
S	SDM	shutdown margin
S		shutdown (noun or adj), shut down (verb)
S		shutoff (noun or adj), shut off (verb)
S		sic (so, thus)
S	S	siemens (unit of conductance)
S		sign-off (noun or adj), sign off (verb)
S		single-degree-of-freedom
S		site-specific
S		small bore
S		small-scale (adj)
S	SSI	soil-structure interaction
S		sole-source (adj)
S		solid-state (adj)
S	SSPS	solid-state protection system
S	sp gr	specific gravity
S	SCN	specification change notice
S	SA	spectral acceleration
S	SFP	spent fuel pool
S	SAT	spray additive tank
S	sq (or2 )	square
S	cm2 (or sq cm)	square centimeter
S	ft2 (or sq ft)	square foot
S	in.2 (or sq in.)	square inch
S	km2	square kilometer
S	m2	square meter
S	m2 /s	square meter per second
S	mm2	square millimeter
S	SRSS	square-root-of-the-sum-of-squares
S	yd2 (or sq yd)	square yard
S	ss	stainless steel
S	std	standard
S	scf	standard cubic feet
S	scfh	standard cubic feet per hour
S	scfm	standard cubic feet per minute
S	scfs	standard cubic feet per second
S	std dev	standard deviation
S	SOP	standard operating procedure
S	STP	standard temperature and pressure
S	SGTS	standby gas treatment system
S	SU	startup (noun or adj), start up (verb)
S		state-of-the-art (adj)
S	SBO	station blackout
S	SPCS	steam and power conversion system
S	SG or S/G	steam generator
S	SGTR	steam generator tube rupture
S		steam line
S	St	stokes
S	SIF	stress intensification factor
S		strike-slip (adj)
S	SSC	structures, systems, and components
S		sua sponte (voluntarily)
S		sub rosa (privately, in secret)
S	SMM	subcooling margin monitor
S		subsection
S		subsurface
S		subsystem
S		subtidal
S	supra id.	supra idem (the same as above)
S	STP	surveillance test procedure
S		switchgear
S		switchyard
S	SVT	systems verification test
T	TCV	temperature control valve
T	TI	temperature indicator
T	TAM	thermal anchor movement
T	TDC	thermal diffusion coefficient
T	TC	thermocouple
T	TLD	thermoluminescent dosimeter
T	TLC	thin-layer chromatography
T	k	thousand
T	keV	thousand electron volts
T		three-step
T		time-history
T		to date
T		ton (spell out)
T	tpd	tons per day
T	tpy	tons per year
T		tornado-borne
T	TDH	total dynamic head
T	TEDE	total effective dose equivalent
T	TSP	tube support plate
T		tubesheet
T	TIG	tungsten inert gas (welding process)
T	TB	turbine building
T	TBS	turbine bypass system
T	TDAFW	turbine-driven auxiliary feedwater (pump)
T	TG	turbine generator
T	TPS	turbine protection system
T		turnover
U	UHS	ultimate heat sink
U	UHF	ultrahigh frequency
U	UDRPS	ultrasonic data recording and processing system
U	UT	ultrasonic testing
U	uv	ultraviolet
U		underfrequency
U		undersized
U		undervoltage
U	UPS	uninterruptible power system
U	URI	unresolved item
U	USI	unresolved safety issue
U	UEQ	unreviewed environmental question
U	USQ	unreviewed safety question
U		upender
U	U	uranium
V	VBS	vehicle barrier systems
V	v	velocity
V	VHF	very high frequency
V	VLF	very low frequency
V	VLPM	vibration and loose parts monitor
V	viz.	videlicet (namely)
V	V	volt
V	VA	volt-ampere
V	VAR	volt amps reactive
V	V/m	volt per meter
V	Vac	volts, alternating current
V	Vdc	volts, direct current
V	vol	volume
V	VCT	volume control tank
V	vpm	volume parts per million
V	v/v	volume per volume
V	vol % or v/o	volume percent
W	whse	warehouse
W		washout (noun), wash out (verb)
W	WHAT	wastewater holding and treatment
W		water-cooled
W	W	watt
W	Wh	watt-hour
W	Wb	weber
W	wt	weight
W	wt % or w/o	weight percent
W	W/V	weight-to-volume ratio
W	W/W	weight-to-weight ratio
W	WPS	welding procedure specification
W	WL	wind load
W	wo	work order
W		workload
W		worst-case (adj), worst case (noun)
Y	yd	yard(s)
Z	ZPA	zero period acceleration (ground acceleration)
Z	ZOI	zone of influence