Except for the winter of 2022 when more than half of French reactors were not running, which was especially critical because of the Russian War against the Ukraine. Coal reactors had to be reactivated in Germany so lights didn't turn off in France.
Or summer when reactors have to be shut down because the rivers are too hot or running low.
France net imported in 2022 less vs Germany net imported in 2024 in business as usual situation
Edf also announced yo add cooling towers to bypass old environmental laws, especially for Golfech
Palo Verde is right next to the Sonoran Desert and has been running for forty years in Arizona heat:
* https://en.wikipedia.org/wiki/Palo_Verde_Nuclear_Generating_...
There's no technical reason why nuclear plants can't run in low/hot water situations.
Germany activated coal to reduce dependance on gas, and Germany exported energy to France because of the maintainances ; you know, the old correlation =/= causation.
That one occurence over 4 decades, I would say we can dare to call it pretty reliable
This may come as an issue if air con develops fast, though.