Glossary of Nuclear Terms

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Access hatch Activation Active fuel length Agreement State Air sampling Airborne radioactivity area	ALARA Alpha particle Anion Annual limit on intake (ALI) Atom Atomic energy	Atomic Energy Commission Atomic number Attenuation Auxiliary building Auxiliary feedwater Average planar linear heat generation rate (APLGHR)

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Background radiation Becquerel (Bq) Beta particle Binding energy	Bioassay Biological halflife Biological shield Boiling water reactor (BWR)	Bone seeker Breeder British thermal unit (Btu) Byproduct

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Calibration Capability Capacity factor (gross) Capacity factor (net) Cask Cation Chain reaction Charged particle Chemical recombination Cladding Cleanup system Coastdown Cold shutdown	Collective dose Committed dose equivalent Committed effective dose equivalent Compact Compound Condensate Condenser Construction recapture Contamination Containment structure Control rod Controlled area Control room	Coolant Cooldown Cooling tower Core Core melt accident Cosmic radiation Counter Critical mass Critical organ Criticality Crud Cumulative dose Curie (Ci)

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Daughter products Decay heat Decay, radioactive Declared pregnant woman Decommission Decon Decontamination Defense-in-Depth Departure from nucleate boiling (DNB)	Departure From Nuclear Boiling Ratio (DNBR) Depleted uranium Derived air concentration (DAC) Design-basis accident Design-basis phenomena Detector Deterministic effect Deuterium Deuteron	Differential pressure (dp or P) Doppler coefficient Dose Dose, absorbed Dose equivalent Dosimeter Dosimetry Dose rate Drywell

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Earthquake, operating basis Effective halflife Efficiency, plant Electrical generator Electromagnetic radiation Electron	Element Emergency Classifications Emergency core cooling systems (ECCS) Emergency feedwater Entomb	Exclusion area Excursion Exposure External radiation Extremities

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Fast fission Fast neutron Fast reactor Feedwater Fertile material Film badge	Fissile material Fission (fissioning) Fission gases Fission products Fissionable material Flux	Fuel assembly Fuel cycle Fuel reprocessing Fuel rod Fuel temperature coefficient of reactivity Fusion reaction

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Gap Gamma radiation Gas-cooled reactor Gases	Gaseous diffusion plants (GDPs) Geiger-Mueller counter Generation (gross) Generation (net)	Graphite Gigawatt Gigawatthour Gray (Gy)

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Halflife Halflife, biological Halflife, effective Half-thickness Head, reactor vessel Health physics	Heat exchanger Heat sink Heatup Heavy water (D20) Heavy water moderated reactor	High-Enriched Uranium High-level waste High Radiation Area Hot Hot spot

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Induced radioactivity Ion Ionization Ionization chamber	Ionizing radiation Irradiation Isotone	Isotope Isotope separation Isotopic enrichment

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Kilo-	Kilovolt	Kinetic energy

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Lethal dose Light water Light water reactor Limiting condition for operation	Limiting safety system settings Linear heat generation rate Loop	Loss of coolant accident (LOCA) Low-level waste Low population zone (LPZ)

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Mass-energy equation Mass number Maximum dependable capacity (gross) Maximum dependable capacity (net) Mega- Megacurie Megawatt (MW)	Megawatt hour (Mwh) Metric ton Micro- Microcurie Mill tailings Milli- Millirem	Milliroentgen Mixed Oxide Fuel Moderator Moderator temperature coefficient of reactivity Molecule Monitoring

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Nano- Nanocurie Natural circulation Natural uranium Net summer capability Neutron Neutron capture Neutron chain reaction Neutron flux	Neutron generation Neutron leakage Neutron source Neutron, thermal Noble gas Nonpower reactor Non-stochastic effect Non-vital plant systems Nozzle	Nuclear energy Nuclear force Nuclear power plant Nuclear steam supply system Nuclear Waste Nucleon Nucleus Nuclide

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Operable	Operational mode

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Parent Parts per million (ppm) Pellet, fuel Performance-based Regulation Periodic Table Personnel monitoring Photon Pico- Picocurie	Pig Pile Planned special exposure Plutonium (Pu) Pocket dosimeter Poison, neutron Pool reactor Positron Power coefficient of reactivity	Power defect Power reactor Pressure vessel Pressurized water reactor (PWR) Pressurizer Primary system Proportional counter Proton

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Quality factor	Quantum theory

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Rad Radiation, nuclear Radiation area Radiation detection instrument Radiation shielding Radiation sickness (syndrome) Radiation source Radiation standards Radiation warning symbol Radioactive contamination Radioactive series	Radioactivity Radiography Radioisotope Radiological Sabotage Radiological survey Radiology Radionuclide Radiosensitivity Radium (Ra) Radon (Rn) Reaction	Reactivity Reactor coolant system Reactor, nuclear Recycling Reference man Reflector Rem Restricted area Risk-informed Regulation Roentgen (R) Rubblization

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Safeguards Safe shutdown earthquake Safety injection Safety limit Safety related SAFSTOR Scattered radiation Scintillation detector Scram Sealed Source Secondary radiation Secondary system	Seismic category I shielding Shutdown Shutdown margin Sievert (Sv) Somatic effects of radiation Source material Special nuclear material Spent (depleted) fuel Spent fuel pool Spent nuclear fuel Stable isotope	Standard Technical Specifications Startup Stay time Steam generator Stochastic effects Subcriticality Subcritical mass Supercriticality Supercritical reactor Superheating Survey meter

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Technical Specifications Terrestrial radiation Thermal breeder reactor Thermalization Thermal power	Thermal reactor Thermal shield Thermoluminescent dosimeter Thermonuclear Transient	Trip, reactor Tritium Turbine Turbine generator (TG)

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Ultraviolet Unrestricted area	Unstable isotope Uranium	Uranium fuel fabrication facility Uranium hexafluoride production facility

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Vapor Void	Very high radiation area Viability assessment	Void coefficient of reactivity

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Waste, radioactive Watt Watt-hour	Weighting factor Well-logging Wheeling Service	Whole-body counter Whole-body exposure Wipe sample

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X-rays

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Yellowcake

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