It's a shame we don't do fuel reprocessing in the US. Generally those rods have quite a bit of usable fissile material left it's just fallen below the economic threshold where it's better to replace them than continue using them.
<a href="https://www.funraniumlabs.com/2024/04/choose-your-own-radiation-adventure-kneejerk-spent-fuel-solutions/" rel="nofollow">https://www.funraniumlabs.com/2024/04/choose-your-own-radiat...</a> Is a nice overview of the various other fuel disposal solutions. Worth reading for the section on reprocessing alone. How big of a superfund site do we want to create?
What are the drawbacks of dumping [denser than water] radioactive waste at the bottom of the ocean? Is transportation to a deep-water site too expensive and risky.