False, with heavy subsides ~70% of Frances electricity production for the power grid was nuclear but they exported a great deal of that nuclear power in non peak times such as nights and weekends to maintain even a 68% capacity factor. Further they imported a great deal of non nuclear power to cover their own peak demand. By comparison US reactors generally have over a 90% capacity factor which means generating ~30% more electricity from the same investment or in Frances case posting a ~30% premium on nuclear power.

It’s hard to work out exact figures but around 60% of the grid’s electricity used in France came from nuclear reactors. To illiterate the difficulty, recently most of France’s nuclear power plant where undergoing maintenance however due to low seasonal demand other power plants where able to make up the difference.

PS: To be really pedantic, total electricity production would include car alternators, home PV panels, diesel electric locomotive etc, but that’s yet another calculation.