Honestly not a terrible idea. Just have your reactor on a huge barge and if it goes meltdown just drag it out into international waters and let the fish deal with it /s

An actual meltdown at sea would have the now-molten uranium come in contact with seawater, which would instantly flash to high-pressure steam, throwing the uranium into a cancer-causing cloud that the world has never yet seen.

This is absolutely a terrible idea about how to deal with a meltdown.