- Industry: Government
- Number of terms: 11131
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A radioactive element with the atomic number 92 and, as found in natural ores, an atomic weight of approximately 238. The two principal natural isotopes are uranium-235 (which comprises 0. 7 percent of natural uranium), which is fissile, and uranium-238 (99. 3 percent of natural uranium), which is fissionable by fast neutrons and is fertile, meaning that it becomes fissile after absorbing one neutron. Natural uranium also includes a minute amount of uranium-234.
Industry:Energy
Refers to sealed sources of radioactive material contained in a small volume (but not radioactively contaminated soils and bulk metals) in any one or more of the following conditions (taken from the NRC Orphan Source Initiative):
* In an uncontrolled condition that requires removal to protect public health and safety from a radiological threat;
* Controlled or uncontrolled, but for which a responsible party cannot be readily identified; Controlled, but the material's continued security cannot be assured. If held by a licensee, the licensee has few or no options for, or is incapable of providing for, the safe disposition of the material;
* In the possession of a person, not licensed to possess the material, who did not seek to possess the material; or
* In the possession of a state radiological protection program for the sole purpose of mitigating a radiological threat because of one of the above conditions, and for which the state does not have a means to provide for the material's appropriate disposition.
Industry:Energy
The area outside the owner-controlled portion of a nuclear facility (usually the site boundary). An area in which a person could not be exposed to radiation levels in excess of 2 millirems in any one hour from external sources (see 10 CFR 20. 1003).
Industry:Energy
Regulatory criteria that go beyond the levels that would be reasonably expected to be imposed on licensees given that regulations apply to conditions that incorporate normal operation and design-basis conditions.
Industry:Energy
Defines an interval within which a numerical result is expected to lie within a specified level of confidence. The interval often used is the 5-95 percentile of the distribution reporting the uncertainty.
Industry:Energy
Electromagnetic radiation of a wavelength between the shortest visible violet and low energy x-rays.
Industry:Energy
The Federal agency responsible for protecting human health and safeguarding the environment. The EPA leads the Nation’s environmental science, research, education, and assessment efforts to ensure that efforts to reduce environmental risk are based on the best available scientific information. The EPA also ensures that environmental protection is an integral consideration in U. S. Policies.
Industry:Energy
The Federal agency responsible for leading the unified national effort to secure the U. S. Against those who seek to disrupt the American way of life. DHS is also responsible for preparing for and responding to all hazards and disasters and includes the formerly separate Federal Emergency Management Agency, the Coast Guard, and the Secret Service.
Industry:Energy
A change in the reactor coolant system temperature, pressure, or both, attributed to a change in the reactor’s power output. Transients can be caused by (1) adding or removing neutron poisons, (2) increasing or decreasing electrical load on the turbine generator, or (3) accident conditions.
Industry:Energy
