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A coil gun will have huge copper coils, say at least 6 times as large as the projectile, at this size you'd probably also need to pump coolant through them to also deal with the heat. The best use case for coil guns is for mortars. The advantage of railguns is that there are more solutions for...

coil guns have an issue with their maximum muzzle velocity being limited by your ability to switch the electromagnets on and off. You need a really fast quench for high velocities, which is not an insignificant task when you want significant force out of the magnet. Inductors, like capacitors...

A meltdown at sea quickly becomes a lump of saltwater cooled metal surrounded by the best radiation insulator known to man. You could swim pretty damned close to the wreck and still be getting less than background radiation. There is actually a pretty high chance that the fuel will be separated...