Alert

Due to a lapse in appropriations, the NRC has ceased normal operations. However, excepted and exempted activities necessary to maintain critical health and safety functions—as well as essential progress on designated critical activities, including those specified in Executive Order 14300—will continue, consistent with the OMB-Approved NRC Lapse Plan.

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Glossary

… Glossary … See also Full-Text Glossary NUREG-0544, "Collection of Abbreviations" A | B | C … | O | P | Q | R | S | T | U | V | W | X | Y | Z Zirconium … Glossary …

Full-Text Glossary

… Full-Text Glossary … See also NUREG-0544, "Collection of … together into assemblies for use in a reactor . … Full-Text Glossary …

Glossary of Security Terms for Nuclear Power Reactors (NUREG-2203)

… Glossary of Security Terms for Nuclear Power Reactors … DC 20555-0001 Availability Notice Abstract This is a glossary of security terms specifically for nuclear power … in understanding common terms used in security. … Glossary of Security Terms for Nuclear Power Reactors …

Glossary of Risk-Related Terms in Support of Risk-Informed Decisionmaking (NUREG-2122)

… Glossary of Risk-Related Terms in Support of Risk-Informed … erroneously perceived as technical issues. Therefore, a glossary with agreed-upon definitions of risk-informed … an essential tool for future risk-informed activities. This glossary addresses risk-related terms used in the context of …

Uranium

Uranium … A radioactive element with the atomic number 92 and, as found in natural ores, an atomic weight of approximately 238. The two principal natural isotopes are uranium-235 (which comprises 0.7 percent of natural uranium ), which is fissile , and …

Decay, radioactive

Decay, radioactive … The spontaneous transformation of one radioisotope into one or more different isotopes (known as “decay products” or “ daughter products ”), accompanied by a decrease in radioactivity (compared to the parent material). This …

Radioactivity

Radioactivity … The property possessed by some elements (such as uranium ) of spontaneously emitting energy in the form of radiation as a result of the decay (or disintegration) of an unstable atom . Radioactivity is also the term used to describe the …

Subcriticality

Subcriticality … The condition of a nuclear reactor system, in which nuclear fuel no longer sustains a fission chain reaction (that is, the reaction fails to initiate its own repetition, as it would in a reactor's normal operating condition). A reactor …

Reactor, nuclear

Reactor, nuclear … The heart of a nuclear power plant or nonpower reactor , in which nuclear fission may be initiated and controlled in a self-sustaining chain reaction to generate energy or produce useful radiation. Although there are many types of …

Nuclear reactor

Nuclear reactor … The heart of a nuclear power plant or nonpower reactor , in which nuclear fission may be initiated and controlled in a self-sustaining chain reaction to generate energy or produce useful radiation. Although there are many types of …