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Used fuel is hot because only about 55 of the energy available in it has actually been used, the other 95% is still available for use, if it is reprocessed to reduce the waste products of fission from it. then you can get to around 60% of the energy out, and can blend it with depleted uranium and burn that as well. just needs to be reprocessed, which is a politically hot potato, and is not done anywhere other than Japan.Kind of like buying a new car, and throwing it on the junkheap when the fuel tank is empty, as opening it and pouring in petrol is too much of a hassle.
You'd really want to put a heat exchanger in the system, somewhere between the subs and the flats. Otherwise I wouldn't fancy the chances much, for a plumber called out to fix a leaking radiator.