Well it depends.. the enrichment process to make uranium a good fuel can also be used to make weapons grade materials (i.e. instead of going to 3 or 5% of U-235 go to 85% U-235, of course that's a pretty significant leap).. The big problem is that Pu-239 is left over in spent fuel rods, and that can be made into weapons. It can also be burned in reactors but that requires a different reactor to burn it well so right now (in the US's case anyway) they just store it, if it was reprocessed that helps with the waste problem.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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