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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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In situ recovery (ISR)

In situ recovery (ISR) … A common method currently used to extract uranium from ore bodies without physical excavation of the ore. This technique is also known as “solution mining” or in situ leaching. For additional detail, see  In Situ Recovery …

High radiation area

High radiation area … Any area with dose rates greater than 100 millirems (1 millisievert) in one hour 30 centimeters from the source or from any surface through which the ionizing radiation penetrates. Areas at licensee facilities must be posted as "high …

High-level waste

High-level waste … 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 reactors The …

Mass-energy equation

Mass-energy equation … The equation developed by Albert Einstein, which is usually given as E = mc 2 , showing that, when the energy of a body changes by an amount E (no matter what form the energy takes), the mass (m) of the body will change by an amount …

Idealized surface crack

Idealized surface crack … A planar crack on the inside surface of a component that has a semielliptical shape. … Idealized surface …

Leak before break

Leak before break … The concept that a leaking crack will be detected before it becomes unstable and leads to a rupture. … Leak before …

Stress-intensity factor

Stress-intensity factor … A characterization of the driving force for fracture at the tips of a crack. … Stress-intensity factor …

Through-wall crack

Through-wall crack … A crack that penetrates a component and is open to both the inside and outside. … Through-wall crack …

Licensing Support Network (LSN) Library

Licensing Support Network (LSN) Library … A library providing access to publicly available documents related to the hearings regarding DOE’s application for authorization to construct a high-level nuclear waste geologic repository at Yucca Mountain, NV. …

National Environmental Policy Act (NEPA)

National Environmental Policy Act (NEPA) … A U.S. environmental law enacted on January 1, 1970. The NRC implements NEPA as part of its regulatory process by evaluating the relevant environmental effects for particular actions. A typical review will …