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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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In situ recovery

In situ recovery … One of the two primary recovery methods that are currently used to extract uranium from ore bodies where they are normally found underground (in other words, in situ), without physical excavation. Also known as “solution mining” or …

Health physics

Health physics … The science concerned with recognizing and evaluating the effects of ionizing radiation on the health and safety of people and the environment, monitoring radiation exposure , and controlling the associated health risks and environmental …

In situ leach

In situ leach … A process using a solution called lixiviant to extract uranium from underground ore bodies in place (in other words, in situ). Lixiviant, which typically contains an oxidant such as oxygen and/or hydrogen peroxide mixed with sodium …

Gas-cooled reactor

Gas-cooled reactor … A nuclear reactor in which the coolant is a gas. … Gas-cooled reactor …

Core melt accident

Core melt accident … An event or sequence of events that result in the melting of part of the fuel in the reactor core . … Core melt …

Fault tree

Fault tree … A fault tree identifies all of the pathways that lead to a system failure. Toward that end, the fault tree starts with the top event , as defined by the event tree , and identifies (using the AND, OR, M out of N logic connectors) what …

Core damage frequency

Core damage frequency … An expression of the likelihood that, given the way a reactor is designed and operated, an accident could cause the fuel in the reactor to be damaged. … Core damage …

Power uprate

Power uprate … The process of increasing the maximum power level at which a commercial nuclear power plant may operate. This power level, regulated by the NRC, is included in the plant's operating license and technical specifications . A licensee may only …

Active fuel length

Active fuel length … The end-to-end dimension of fuel material within a fuel assembly (also known as a "fuel bundle" or "fuel element"). … Active fuel …

Effective Dose Equivalent

Effective Dose Equivalent … The sum of the products of the dose equivalent to the organ or tissue (H T ) and the weighting factors (W T ) applicable to each of the body organs or tissues that are irradiated (H E = ΣW T H T ). … Effective Dose …