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High-level waste

Radioactive materials at the end of a useful life cycle that should be properly disposed of, including--

The highly radioactive material resulting from the reprocessing of spent nuclear fuel, including liquid waste directly in reprocessing and any solid material derived from such liquid waste that contains fission products in concentrations;
Irradiated reactor fuel; and
Other highly radioactive material that the Commission, consistent with existing law, determines by rule require permanent isolation.

High-level waste (HLW) is primarily in the form of spent fuel discharged from commercial nuclear power reactors. It also includes HLW from activities and a small quantity of reprocessed commercial HLW (see 10 CFR 63.2 and Nuclear waste; Waste, radioactive; and Low-level waste).