[AlexanderHowl]

That would be an interesting thing to watch from a safe distance...such as the Moon. I know that I would much rather depend on any other source of energy than a repurposed nuclear reactor from a nuclear submarine. While there are probably more dangerous ways to use nuclear power, I cannot think of any.

Anyway, the fuel would have decayed sufficiently within a quarter century to 'poison' the fuel rods, so they would just be highly radiative waste. Without new nuclear fuel or reprocessed nuclear fuel, the reactor would be useless. Of course, with new nuclear fuel or reprocessed nuclear fuel, the salvaged nuclear reactor would be a deathtrap, but I doubt that an AtE society can make or reprocess nuclear fuel.