Dumping treated coolant is really only a political problem. After the the coolant is treated the only radioactivity left is from tritium which is a low energy beta emitter with a 12 year half life. It has already had one half life to decay. Diluted in the ocean it is harmless.
The only problem with dumping in the ocean is political.
--as with everything else about nuclear power--
Yes. just fill a super tanker, take it out to mid ocean, and dump it.
I’ve read that too. We did tons of surveys in the bikinis expecting to see radiation damage and didn’t find any. There was something about a ship near San Francisco bay that sunk with radioactive waste (i think) and they had to get within inches to get any reading at all. The sea blocks or absorbs it so quickly its a non issue