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DOE-HDBK-1188-2006
Although sometimes used as a synonym for fissionable material, this term has acquired a more
restricted meaning; namely, any material fissionable by low-energy (i.e., thermal or slow) neutrons.
Fissile materials include U-235, U-233, Pu-239, and Pu-241. (See fissionable material.) [Derived
from NRC Glossary]
Definition specific to hazardous materials transportation
Means plutonium-238, plutonium-239, plutonium-241, uranium-233, uranium-235, or any
combination of these radionuclides. The definition does not apply to unirradiated natural uranium and
depleted uranium, and natural uranium or depleted uranium that has been irradiated in a thermal
reactor. Certain additional exceptions are provided in 49 CFR 173.453. [49 CFR 173.403]
73. FISSION. A nuclear transformation that is typically characterized by the splitting of a heavy nucleus
into at least two other nuclei, the emission of one or more neutrons, and the release of a relatively
large amount of energy. Fission of heavy nuclei can occur spontaneously or be induced by neutron
bombardment. [Derived from RHH, BEIR III]
74. FISSION PRODUCTS. Nuclei (fission fragments) formed by the fission of heavy elements, plus the
nuclides formed by the fission fragments' radioactive decay. [NRC Glossary, HPRH, ANSI N1.1]
75. FISSIONABLE MATERIAL. Commonly used as a synonym for fissile material, the meaning of this
term has been extended to include material that can be fissioned by fast neutrons, such as uranium-
238. [NRC Glossary]
76. FLOODPLAINS. The lowlands and relatively flat areas adjoining inland and coastal waters and the
flood prone areas of offshore islands. Floodplains include, at a minimum, that area with at least a 1.0
percent chance of being inundated by a flood in any given year.
The base floodplain is defined as the area which has a 1.0 percent or greater chance of being
flooded in any given year. Such a flood is known as a 100-year flood.
The critical action floodplain is defined as the area which has at least a 0.2 percent chance of being
flooded in any given year. Such a flood is known as a 500-year flood. Any activity for which even a
slight chance of flooding would be too great (e.g., the storage of highly volatile, toxic, or water
reactive materials) should not occur in the critical action floodplain.
The probable maximum flood is the hypothetical flood that is considered to be the most severe
reasonably possible flood, based on the comprehensive hydrometeorological application of maximum
precipitation and other hydrological factors favorable for maximum flood runoff (e.g., sequential
storms and snowmelts). It is usually several times larger than the maximum recorded flood. [Derived
from 10 CFR 1022.4, DOE Glossary]
77. FUGITIVE EMISSIONS.
A-16


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