you need to gradually replace renewables, especially for a grid that was gradually deployed.
You still can stockpile nuclear, France does have several years worth of fuel for such emergencies.
France reprocesses only part of the fuel, is expanding Orano facility, but why is this relevant? They do it and they get additional un-enriched uranium stockpile. WTH dude? Are you just throwing random antinuclear statements around? Only in german forums i've seen such strong antinuclear opinions