Coal in France is not "base load" power.
It is load following and peak power.
Would be completely idiotic to power down a nuke to produce base load with coal.
The natural gas is probably not split between baseload and peak. Sorry, are you an complete idiot?
France produces over 70% of its power with nukes. And due to its night working reprocessing plants and other night stuff (like heating up household heat reservoirs) it has an extremely high base load of over 60%.
However: all the nukes are far above "base load".
No one is using coal, gas or anything else for "base load" in that situation.
France should convert their hydro from a base load to a peaking source aka as pumped storage. The power stored would come from a combination of both renewables and nuclear.
If Hydro is listed in a report, it is usually "base load" for a reason. Pumped storage is not listed in "energy production by source". The energy needed/used to pump it up is listed instead.
If France had any need for more pumped storage, I assume the "engineers who have a clue" had already initiated such programs :D
BTW: most energy France is importing form Germany is used to refill their pumped storages.