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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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Outage (forced)

Outage (forced) … The shutdown of a generating unit, transmission line, or other facility for emergency reasons, or a condition in which the equipment is unavailable as a result of an unanticipated breakdown. An outage (whether full, partial, or …

Special nuclear material

Special nuclear material … Plutonium , uranium-233 , or uranium enriched in the isotopes uranium-233 or uranium-235. For additional detail, see Special Nuclear Material . … Special nuclear …

Assumptions (for IPEs, IPEEs, and PRAs)

Assumptions (for IPEs, IPEEs, and PRAs) … In the context of individual plant examinations (IPEs) , individual plant examinations for external events (IPEEE) , and probabilistic risk assessments (PRAs) , assumptions are those parts of the mathematical …

Graphite

Graphite … A form of carbon, similar to that used in pencils, used as a moderator in some nuclear reactors . … Graphite …

Dosimetry

Dosimetry … The theory and application of the principles and techniques involved in measuring and recording doses of ionizing radiation . … …

Attenuation

Attenuation … The process by which the number of particles or photons entering a body of matter is reduced by absorption and scattered radiation . … …

Outage

Outage … The period during which a generating unit, transmission line, or other facility is out of service. Outages may be forced or scheduled , and full or partial. … …

Scram

Scram … The sudden shutting down of a nuclear reactor , usually by rapid insertion of control rods , either automatically or manually by the reactor operator. Also known as a "reactor trip". … …

Detector

Detector … A material or device that is sensitive to ionizing radiation and can display its characteristics and/or produce a signal suitable for measurement or analysis. See also radiation detection instrument . … …

Derived air concentration (DAC)

Derived air concentration (DAC) … The concentration of a given radionuclide in air which, if breathed by the reference man for a working year of 2,000 hours under conditions of light work (with an inhalation rate of 1.2 cubic meters of air per hour), …