I live in France, and the nuclear power is working perfectly fine. France has about half the carbon emissions of Germany per capita entirely because of German neuroses about nuclear power. While occasionally, they have to turn off one or two reactors so the fish in a given river aren't too hot, it's hardly causing rolling blackouts or energy shortages.

Renewables also occasionally don't work as well, whether during the night or when the wind isn't blowing (before you retort with oh, but what about batteries, well, those would equally apply to reactors, in which case your original point is irrelevant).