The major threat to a nuclear reactor is loss of afterglow heat cooling, which is extra unlikely when you're surrounded by water. That said, one interesting ap

The major threat to a nuclear reactor is loss of afterglow heat cooling, which is extra unlikely when you're surrounded by water. That said, one interesting approach is to use ocean-faring nuclear-powered tugs that basically stay out in international water and hand off massive container barges to little fossil fueled short-haul ones that can take it in to port where people are afraid of nuclear fission but don't care about air pollution or climate change. As for refueling, it's true that submarines don't need to refuel for 30 years. But there's a lot more room on a container ship, so you can make a big core and run it at less than full power. This way you can get it to only need refueling every 5 years or so with low-enriched uranium. Not bad. Nuclear tugs: https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1559-3584.1963.tb04392.x https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1559-3584....