French reactors are all the same design (derived from one licensed from Westinghouse). That's how they got the economies of scale and were able to ramp up so quickly. Unfortunately, that also means a flaw is reproduced in all of them. To compound this, the replacements were not started quickly enough so the current reactors are reaching the end of their design life, and because there was not a program to continuously build bew reactirsm the industrial skills base atrophied as qualified workers like welders retired. And the trifecta is France is experiencing its worst drought in recorded history, so some of the plants that get cooling from river water had to shut down due to low water levels. Even the mighty Rhine is a mere rivulet at the moment.
This is a bit of a myth. The heat wave and water levels was a problem, but most of it was maintenance issues unrelated to that. It was more a problem of mismanagement, and the fact that Macron went into office promising to shut down the fleet, making operators start to cut down on maintenance. He has now reversed course after realising that depending on Russian gas is bad. All wind/solar in Europe works by balancing it against natural gas or hydro, but the amount of hydro is fixed so expanding the wind/solar fleet increases the demand for gas. Hence why the renewable poster child Germany is in so deep shit right now.
