Separate the fissile material and reuse it as fuel.
Anything else is just plain stupid.
Yes, I know current US policy doesn't allow that, This doesn't make it less stupid.
Reductionist and proud of it.
Being ignorant is not so much a shame, as being unwilling to learn. Benjamin Franklin
Chase after the truth like all hell and you'll free yourself, even though you never touch its coat tails. Clarence Darrow
A person who won't read has no advantage over one who can't read. Mark Twain