No, they don't. The French grid wouldn't have made it through 2022 without a lot of imports from Germany, as too many reactors were down for maintenande. They found a fault which concerned most reactors of that type. On top of that, in the summer the cooling of the reactors is a growing worry with raising temperatures. Of course, you could decide to sterelize the rivers used for cooling. Alternatively, you have to throttle the nuclear output.