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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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Heavy water (D2O)

Heavy water (D2O) … Water containing significantly more than the natural proportions (one in 6,500) of heavy hydrogen (deuterium, D) atoms to ordinary hydrogen atoms. Heavy water is used as a moderator in some reactors because it slows down neutrons …

Light-water reactor

Light-water reactor … A term used to describe reactors using ordinary water as a moderated coolant, including boiling-water reactors (BWRs) and pressurized-water reactors (PWRs), the most common types used in the United States. … Light-water …

Lethal dose (LD)

Lethal dose (LD) … The dose of radiation expected to cause death to 50 percent of an exposed population within 30 days (LD 50/30). Typically, the LD 50/30 is in the range from 400 to 450 rem (4 to 5 sieverts) received over a very short period. … Lethal …

Lens Dose Equivalent

Lens Dose Equivalent … The external exposure dose equivalent to the lens of the eye at a tissue depth of 0.3 centimeters (300 mg/cm 2 ). … Lens Dose …

Limiting condition for operation

Limiting condition for operation … The section of Technical Specifications that identifies the lowest functional capability or performance level of equipment required for safe operation of the facility. … Limiting condition for …

Safeguards information (SGI)

Safeguards information (SGI) … A special category of sensitive unclassified information that must be protected. Safeguards information concerns the physical protection of operating power reactors , spent fuel shipments , strategic special nuclear material …

Safe shutdown earthquake

Safe shutdown earthquake … Is the maximum earthquake potential for which certain structures, systems, and components, important to safety, are designed to sustain and remain functional. … Safe shutdown …

Regulatory Information Conference

Regulatory Information Conference … An annual NRC conference that brings together NRC staff, regulated utilities, materials users, and other interested stakeholders to discuss nuclear safety topics and significant and timely regulatory activities through …

Reactor coolant system

Reactor coolant system … The system used to remove energy from the reactor core and transfer that energy either directly or indirectly to the steam turbine. … Reactor coolant …

Standard Review Plan

Standard Review Plan … A document that provides guidance to the staff for reviewing an application to obtain an NRC license to construct or operate a nuclear facility or to possess or use nuclear materials. … Standard Review …