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High-level waste (HLW) is a type of nuclear waste created by the irradiation of nuclear fuel in a reactor. Irradiation causes a build-up of fission products and transuranic elements in the fuel. Fission products typically have a much shorter half-life than uranium, which means the irradiated fuel is more radioactive and thus hotter than fresh fuel – high-level waste has heat output of >2 kW/m3. At the same time, the fissile material is used up, so that the fuel is no longer able to sustain the operation of the reactor and must be recycled or disposed of as waste.
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