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One use of 2-3 years. You have two of them working at the same time and when it’s time to refuel you have a new one waiting and old gets shipped back to factory for refueling.

The expensive part of nuclear power plants is all the electricity generation part (turbines/generators/piping/transformers/etc) that is pretty much the same as for coal power plants. You don’t swap out any of that.

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What are the chances the old one will be left on the site because it's not financially viable to ship it back and recycle it?

They are the size of a shipping container, not prohibitively expensive to move. The customers buying these things have no ability to recycle/refuel or dispose of the spent fuel. I presume any purchase agreement comes with a commitment to deal with it at end of life.

I guess if the supplier goes out of business, you might have trouble, but I'd expect these companies are putting things in place for that eventuality e.g. insurance.

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