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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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Shallow-Dose Equivalent (SDE)

Shallow-Dose Equivalent (SDE) … The dose equivalent at a tissue depth of 0.007 centimeter (7 mg/cm 2 ), which applies to the external exposure of the skin of the whole body or the skin of an extremity. … Shallow-Dose Equivalent …

Performance-based regulatory action

Performance-based regulatory action … Licensee attainment of defined objectives and results without detailed direction from the NRC on how these results are to be obtained. (See the Communication Plan for Performance-Based Regulation by using accession …

Waste classification (classes of waste)

Waste classification (classes of waste) … Classification of low-level waste (LLW) according to its radiological hazard. The classes include Class A, B, and C, with Class A being the least hazardous and accounting for 96 percent of LLW in the United …

Very high radiation area

Very high radiation area … An area accessible to individuals, in which radiation levels exceed 500 rad (5 gray) in one hour at 1 meter from the source or from any surface that the radiation penetrates (see 10 CFR 20.1003 ). … Very high radiation …

Moderator temperature coefficient of reactivity

Moderator temperature coefficient of reactivity … As the moderator (water) increases in temperature, it becomes less dense and slows down fewer neutrons, which results in a negative change of reactivity. This negative temperature coefficient acts to …

Mixed-oxide (MOX) fuel

Mixed-oxide (MOX) fuel … A type of nuclear reactor fuel that contains plutonium oxide mixed with either natural or depleted uranium oxide, in ceramic pellet form. This differs from conventional nuclear fuel, which is made of uranium oxide. The U.S. …

Non-vital plant systems

Non-vital plant systems … Systems at a nuclear facility that may or may not be necessary for the operation of the facility (i.e., power production) but that would have little or no effect on public health and safety should they fail. These systems are not …

Nuclear steam supply system

Nuclear steam supply system … The reactor and the reactor coolant pumps (and steam generators for a pressurized water reactor) and associated piping in a nuclear power plant used to generate the steam needed to drive the turbine generator unit. … Nuclear …

Nuclear Energy Agency (NEA)

Nuclear Energy Agency (NEA) … A specialized agency within the Organisation for Economic Co-operation and Development (OECD), which was created to assist its member countries in maintaining and further developing the scientific, technological, and legal …

Individual plant examination (IPE)

Individual plant examination (IPE) … As requested by the NRC in Generic Letter 88-20, "Individual Plant Examination for Severe Accident Vulnerabilities" (November 23, 1988), a risk analysis that considers the unique aspects of a particular nuclear power …