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The long term plan is to reprocess it, which is why we need to keep it around in the meantime. If we just wanted to get rid of it that would be trivially easy. But we don’t want that because we know in future we’re going to want to get it back from wherever we put it.

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They've given up on fast reactors. Reprocessing with thermal reactors doesn't actually solve the problem, as MOX fuel cannot then be further reprocessed and used in thermal reactors again. You still end up with all the fission products, and now the higher actinides from spent MOX, to deal with.

Having said that, dry casks are a perfectly cromulent way to deal with spent fuel.

The main motivation to not reprocess fuel was nuclear nonproliferation, because it frees up the plutonium for nuclear weapons. But on the off chance that governments ever want to build a giant pile of nuclear weapons it’s sensible to not get rid of the nuclear waste, since if it ever turns out you do want it again it’s very expensive and time consuming to produce. Since you’ve already gone to all of the effort of mining the uranium and producing a bunch of plutonium, best to just keep it around somewhere in case you ever do want it for some reason.

I'd say the main motivation to not reprocess is that it costs more than not reprocessing. It's a net economic loss.

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