Seaside plants don't have this problem in France, never have, never will.

The issue happens with river plants, more specifically those that release cooling water back to the river.

This was vastly exaggerated probably to distraction the attention from the French public that the vast majority of the plants being put offline was due to the fact that they had their maintenance postponed till the limits, and then you had a bunch of reactors that, per regulations, needed to be turned-off at the same time. Only a few of the plants had this thermal problem, the ones that discharge hot water directly into the rivers.