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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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Airborne radioactivity area

Airborne radioactivity area … As defined in Title 10, Section 20.1003, of the Code of Federal Regulations ( 10 CFR 20.1003 ), the airborne radioactivity area is a room, enclosure, or area in which airborne radioactive materials, composed wholly or …

Waste, radioactive

Waste, radioactive … Radioactive materials at the end of their useful life or in a product that is no longer useful and requires proper disposal. See High-level radioactive waste , Low-level radioactive waste , and Spent (depleted or used) nuclear fuel . …

Nuclear fuel

Nuclear fuel … Fissionable material that has been enriched to a composition that will support a self-sustaining fission chain reaction when used to fuel a nuclear reactor , thereby producing energy (usually in the form of heat or useful radiation) for use …

High-level radioactive waste (HLW)

High-level radioactive waste (HLW) … The highly radioactive materials produced as byproducts of fuel reprocessing or of the reactions that occur inside nuclear reactors . HLW includes: Irradiated spent nuclear fuel discharged from commercial nuclear power …

Licensing basis

Licensing basis … The collection of documents or technical criteria that provides the basis upon which the NRC issues a license to construct or operate a nuclear facility; to conduct operations involving the emission of radiation; or to receive, possess, …

Low-level waste

Low-level waste … A general term for a wide range of items that have become contaminated with radioactive material or have become radioactive through exposure to neutron radiation. A variety of industries, hospitals and medical institutions, educational …

Alpha particle

Alpha particle … A positively charged particle ejected spontaneously from the nuclei of some radioactive elements . It is identical to a helium nucleus that has a mass number of 4 and an electrostatic charge of +2. It has low penetrating power and a short …

Collective dose

Collective dose … As defined in Title 10, Section 20.1003, of the Code of Federal Regulations ( 10 CFR 20.1003 ), this is the sum of the individual doses received in a given period by a specified population from exposure to a specified source of radiation …

Gray (Gy)

Gray (Gy) … One of the two units used to measure the amount of radiation absorbed by an object or person, known as the " absorbed dose ," which reflects the amount of energy that radioactive sources (with any type of ionizing radiation ) deposit in …

Gaseous diffusion

Gaseous diffusion … A uranium enrichment process used to prepare uranium for use in fabricating fuel for nuclear reactors by separating its isotopes (as gases) based on their slight difference in velocity. (Lighter isotopes diffuse faster through a porous …