The problem with nuclear is that it doesn’t solve stability. When cold spells hit Europe the French exports turn into imports. So all the French neighbors needs enough backup capacity, generally fossil based today, to both make up for the French exports vanishing, they experiencing the same cold spell, and exporting to France.
Stick two French grids next to each other and they would quickly collapse due to how brittle they are.
All renewable are still subsidized now, at all time, without subsidy no renewable would be installed in europe currently, they would be crushed by nuclear production (who can sell at loss event when renewable are available). Most of the modulation of nuclear reactor is cause because nuclear is pushed out of the marked by subsidized renewable would be sold at loss otherwise.
https://analysesetdonnees.rte-france.com/en/electricity-trad...
You can look at the graphs there is no correlation between winter and imports and France mostly export at all time. You are just making things up. Nuclear production does not depend on the weather and the french production is exactly sized for the french consumption. Historically France used hydro as the other pilotable part of its mix (before the pan european electric grid and exchanges at spot price). Don't look at special events since 2020, look at the graphs for the last forty years.