uranium recovered from spent nuclear fuel. Its isotopic composition differs from natural uranium; uranium-236 can impose an additional fuel-performance penalty.
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Reprocessed uranium refers to uranium that has been recovered from spent nuclear fuel through a chemical process known as reprocessing. When nuclear fuel—usually in the form of uranium dioxide—is used in a nuclear reactor, it undergoes fission, resulting in the production of various products, including plutonium, fission products, and actinides. After the fuel is utilized, it is typically considered waste, but a significant amount of the uranium remains unutilized.