https://min.news/en/tech/30bdf6748162428883857d361132e177.ht...
A nuclear plant using sea water never stops due to heat waves, because it can dilute any amount of hot water.
It's not magic, it's a machine with design limits that extreme weather events can push up against.
It also can pollute rivers and kill fish before it gets to that level.
Sea cooled reactors have issues with jellyfish.
Having said that, the EU needs more gas in winter when it's cold, so doing the maintenance/refueling in the summer makes sense.
Still doesn't change the basic facts that a mix of solar/wind etc. is cheaper and better than nuclear and the annoying 'nuclear isn't affected by the weather' meme is wrong.
We have yet to see 80°c water in the rivers upstream. As I said earlier, the issue is never cooling the reactor, it's always about the state of the environment downstream.
The amount of sunlight your receive, however, will always be the same.