Nuclear energy and radiation terminology · MLC-0119
Nuclear energy and radiation terms: N (40)
- Nano-A prefix that divides a basic unit by one billion (10^(-9)).
- NanocurieOne billionth 10^(-9) of a curie.
- National Environmental Policy ActA U.S. environmental law enacted on January 1, 1970. The NRC implements NEPA as part of its regulatory...
- National Response FrameworkThe guiding principles, roles, and structures that enable all domestic incident response partners to prepare...
- National Source Tracking SystemA secure, Web-based data system that helps the NRC and its Agreement States track and regulate the medical...
- Natural circulationThe circulation of the coolant in the reactor coolant system without the use of the reactor coolant pumps...
- Natural uraniumUranium containing the relative concentrations of isotopes found in nature: 0.7 percent uranium-235, 99.3...
- Net electric generationThe gross amount of electric energy produced by a generating station, minus the amount used to operate the...
- Net summer capacityThe steady hourly output that generating equipment is expected to supply to system load, exclusive of...
- NeutronAn uncharged elementary particle, with a mass slightly greater than that of the proton, found in the nucleus...
- Neutron captureThe reaction that occurs when a nucleus captures a neutron. The probability that a given material will...
- Neutron chain reactionA measure of the intensity of neutron radiation, determined by the rate of flow of neutrons. The neutron flux...
- Neutron fluxA measure of the intensity of neutron radiation, determined by the rate of flow of neutrons. The neutron flux...
- Neutron generationThe release, thermalization, and absorption of fission neutrons by a fissile material and the fission of that...
- Neutron leakageNeutrons that escape from the vicinity of the fissionable material in a reactor core. Neutrons that leak out...
- Neutron sourceAny material that emits neutrons, such as a mixture of radium and beryllium, that can be inserted into a...
- Neutron, thermalA neutron that has (by collision with other particles) reached an energy state equal to that of its...
- Noble gasA gaseous chemical element that does not readily enter into chemical combination with other elements. An...
- Nonpower reactorReactors used for research, training, and test purposes, and for the production of radioisotopes for medical...
- Nonpower reactor (research and test reactor)A nuclear reactor that is used for research, training, or development purposes (which may include producing...
- Non-stochastic effectThe health effects of radiation, the severity of which vary with the dose and for which a threshold is...
- Non-vital plant systemsSystems at a nuclear facility that may or may not be necessary for the operation of the facility (i.e., power...
- Not ApplicableSpecifies that a particular field is not applicable to the event.
- Not ReportedSpecifies that information applicable to the particular field was not included in the event report.
- NozzleAs used in power water reactors and boiling water reactors, the interface (inlet and outlet) between reactor...
- NRC Operations CenterThe primary center of communication and coordination among the NRC, its licensees, State and Tribal agencies...
- Nuclear Energy AgencyA specialized agency within the Organisation for Economic Co-operation and Development (OECD), which was...
- Nuclear forceA powerful short-ranged attractive force that holds together the particles inside an atomic nucleus.
- Nuclear fuelFissionable material that has been enriched to a composition that will support a self-sustaining fission...
- Nuclear Material Management and Safeguards SystemA centralized U.S. Government database used to track and account for source and special nuclear material. The...
- Nuclear materialsSee Special nuclear material, Source material, and Byproduct material. For additional detail, see Nuclear...
- Nuclear poison (or neutron poison)In reactor physics, a substance (other than fissionable material) that has a large capacity for absorbing...
- Nuclear power plantA thermal power plant, in which the energy (heat) released by the fissioning of nuclear fuel is used to boil...
- Nuclear Radiological Incident AnnexAn annex to the National Response Framework, which provides for a timely, coordinated response by Federal...
- Nuclear reactorThe heart of a nuclear power plant or nonpower reactor, in which nuclear fission may be initiated and...
- Nuclear steam supply systemThe reactor and the reactor coolant pumps (and steam generators for a pressurized water reactor) and...
- Nuclear wasteA subset of radioactive waste that includes unusable byproducts produced during the various stages of the...
- NucleonCommon name for a constituent particle of the atomic nucleus. At present, applied to protons and neutrons...
- NucleusThe small, central, positively charged region of an atom. Except for the nucleus of ordinary hydrogen, which...
- NuclideA general term referring to all known isotopes, both stable (279) and unstable (about 2,700), of the chemical...
40 of 555 terms in Nuclear energy and radiation terminology (MLC-0119). Request the full dataset.