Nuclear Waste Nuclear waste fits loosely in 3 categories, by levels of radioactivity/mass or volume: Low Level Waste (LLW): contaminated soil, clothing, debris Intermediate Level Waste (ILW): chemical sludge, reactor shielding, de-commissioning materials High Level Waste (HLW): fission products and transuranic elements from reactors=Spent Nuclear Fuel (SNF) ‏ 95% of waste from nuclear power is LLW+ILW
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