- Industry: Government
- Number of terms: 11131
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The events across the top of the event tree, which graphically represent the systems needed to keep the plant in a safe state following an initiating event (i.e., a challenge to plant operation). A top event is the starting point of the fault tree, which identifies all of the pathways that lead to a system failure. For additional information, see Probabilistic Risk Assessment.
Industry:Energy
The process undergone by high-energy (fast) neutrons as they lose energy by collision.
Industry:Energy
A layer, or layers, of high-density material located within a reactor pressure vessel or between the vessel and the biological shield to reduce radiation heating in the vessel and the biological shield.
Industry:Energy
A reactor in which the fission chain reaction is sustained primarily by thermal neutrons. Most current reactors are thermal reactors.
Industry:Energy
A neutron that has (by collision with other particles) reached an energy state equal to that of its surroundings, typically on the order of 0. 025 eV (electron volts).
Industry:Energy
The portion of the natural background radiation that is emitted by naturally occurring radioactive materials, such as uranium, thorium, and radon in the earth.
Industry:Energy
Part of an NRC license authorizing the operation of a nuclear production or utilization facility. A Technical Specification establishes requirements for items such as safety limits, limiting safety system settings, limiting control settings, limiting conditions for operation, surveillance requirements, design features, and administrative controls. (See also Standard Technical Specifications. )
Industry:Energy
A breeder reactor in which the fission chain reaction is sustained by thermal neutrons.
Industry:Energy
The condition for increasing the level of operation of a reactor. The rate of fission neutron production exceeds all neutron losses, and the overall neutron population increases.
Industry:Energy
