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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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Activation

Activation … The process of making a radioisotope by bombarding a stable element with neutrons or protons . … Activation …

Shutdown

Shutdown … A decrease in the rate of fission (and heat/energy production) in a reactor (usually by the insertion of control rods into the core ). … …

Fuel rod

Fuel rod … A long, slender, zirconium metal tube containing pellets of fissionable material , which provide fuel for nuclear reactors . Fuel rods are assembled into bundles called fuel assemblies , which are loaded individually into the reactor core . … …

Containment building

Containment building … The air-tight building, which houses a nuclear reactor and its pressurizer , reactor coolant pumps, steam generator , and other equipment or piping that might otherwise release fission products to the atmosphere in the event of an …

Coastdown

Coastdown … An action that permits the reactor power level to decrease gradually as the fuel in the core is depleted . … Coastdown …

Radionuclide

Radionuclide … An unstable isotope of an element that decays or disintegrates spontaneously, thereby emitting radiation . Approximately 5,000 natural and artificial radioisotopes have been identified. … …

Cooldown

Cooldown … The gradual decrease in reactor fuel rod temperature caused by the removal of heat from the reactor coolant system after the reactor has been shutdown . … …

Cladding

Cladding … The thin-walled metal tube that forms the outer jacket of a nuclear fuel rod . It prevents corrosion of the fuel by the coolant and the release of fission products into the coolant. Aluminum, stainless steel, and zirconium alloys are common …

Activity

Activity … The rate of disintegration (transformation) or decay of radioactive material per unit time. The units of activity (also known as radioactivity ) are the curie (Ci) and the becquerel (Bq) . For related information, see Measuring Radiation . … …

Licensee

Licensee … A company, organization, institution, or other entity to which the NRC or an Agreement State has granted a general license or specific license to construct or operate a nuclear facility, or to receive, possess, use, transfer, or dispose of …