Energy

Energy

Anything related to the production or supply of energy in any form.

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Energy > Nuclear energy

fast fission

Energy; Nuclear energy

Fission of a "heavy" atom (such as uranium-238) when it absorbs a fast (high energy) neutron. Most fissionable materials need slow (thermal) neutrons in order to fission.

external radiation

Energy; Nuclear energy

Exposure to ionizing radiation when the radiation source is located outside the body.

exposure

Energy; Nuclear energy

Absorption of ionizing radiation or ingestion of a radioisotope. Acute exposure is a large exposure received over a short period of time. Chronic exposure is exposure received ...

excursion

Energy; Nuclear energy

A sudden, very rapid rise in the power level of a reactor caused by supercriticality. Excursions are usually quickly suppressed by the moderator temperature coefficient, the fuel ...

exclusion area

Energy; Nuclear energy

The area surrounding the reactor where the reactor licensee has the authority to determine all activities, including exclusion or removal of personnel and property.

event tree

Energy; Nuclear energy

An event tree graphically represents the various accident scenarios that can occur as a result of an initiating event (i.e., a challenge to plant operation). Toward that end, an ...

event notification (EN) system

Energy; Nuclear energy

An automated event tracking system used internally by the NRC’s Headquarters Operations Center to track incoming notifications of significant nuclear events with an actual or ...