This is the part that has always confused me. Radioactive “waste” should either be radioactive enough that it can continue to be used in some capacity, or it’s inert enough that it’s not too complicated to just bury it, given the relatively small scale. I guess I assumed that there must have been a large gap between being useful and being inert and that must have been the problem with managing waste, but if spent fuel can be refined back into new fuel and inert waste, then I don’t see the issue.