Answer:
High-level radioactive waste is derived from fission systems such as nuclear power plants.
Explanation:
When nuclear fuel is generated, the material that results from the process is still highly radioactive although it is not efficient to generate electricity. This byproduct is still harmful and it is labeled high-level radioactive waste. Although nuclear fuel is not the only one that generates this type of waste, it is the most common concern from the Manhattan project, for instance.
