French nuclear supply chain atrophied quite lot in the last 30 years. Don't forget that even in France, president Hollande promised in 2014 to the voters to slash nuclear's contribution of power generation by 2025.
https://spectrum.ieee.org/renewables-up-nuclear-down-in-fren...
It was only when Russia started invasion in 2022, that the politicians in France started to change their opinion.
If you want build a nuclear power plant you go to nuclear supplier with uninterrupted experience in building nuclear power plants, like South Korea, China or Russia.
The South Koreans build Barakah nuclear power plant 5600 MWe for $32bn.