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Appendix B: Glossary of Technical Terms
Pages 643-648

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From page 643...
... sREEDER REACTOR: A nuclear reactor that produces more fissile material than it consumes. In fast breeder reactors, high-energy (fast)
From page 644...
... FLY ASH: Fine solid particles of noncombustible ash entrained in the flue gases arising from the combustion of carbonaceous fuels. The particles of ash may be accompanied by combustible unburned fuel particles.
From page 645...
... Heavy water is used as a moderator in certain reactors because it slows down neutrons effectively and also has a low cross section for absorption of neutrons. HIGH-LEVEL WASTE: A by-product of the operation of nuclear reactors that includes a variety of aqueous wastes from fuel reprocessing and their solidified denvatives, such as alkaline aqueous waste, calcine, crystallized salts, insoluble precipitates, salts of cesium and strontium extracts, and coating wastes from chemical decladding of fuel elements.
From page 646...
... Naturally heated but unmelted rock sufficiently low in either permeability or pore-fluid content that wells drilled into it do not yield either hot water or steam at commercially useful rates. To be compared with "hydrothermal reservoir " HYDROTHERMAL RESERVOIR: A body of porous, permeable rock, gravel, or soil containing natural steam or naturally heated water at a temperature significantly above the average temperature at the earth's surface.
From page 647...
... REPROCESSiNG: A generic term for the chemical and mechanical processes applied to fuel elements discharged from a nuclear reactor; the purpose is to recover fissile materials such as plutonium-239, uranium-235, and uranium-233 and to isolate the fission products. RESERVES: Resources that are known in location, quantity, and quality and that are economically recoverable using currently available technologies.
From page 648...
... The absorption of a neutron by a thorium atom can result in the creation of the fissile material uranium-233. THROWAWAY FUEL CYCLE: A fuel cycle in which the spent fuel discharged from the reactor is not reprocessed to recover residual plutonium and uranium values.

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