Spent nuclear fuel can actually be burned in gen IV nuclear reactors. The fuel is dissolved in a molten salt which allows us to burn nuclear weapons material and thorium as well. This reactor could reduce the lifetime of nuclear waste from tens of thousands of years down to only hundreds of years.
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Is it worth that extra cost compared to the bottom of the sea wharehouse?
I don't know anything about a warehouse at the bottom of the sea but it's worth it to get rid of radioactive waste that would otherwise last 10s of thousands of years.