[pydry]

France's are struggling to last 60.

Extending their lives to 100 will not only raise maintenance costs even further it will raise the risk of catastrophe quite significantly.

This would be a catastrophe for which e.g. American plants are insured only up to the level of 0.05% of 1 Fukushima level event.

[cyberax]

You know that material science has improved a lot since 1970-s when most of French nuclear reactors were designed, right?

In particular, annealing had been developed fairly recently: https://www.neimagazine.com/features/featurerenewal-by-annea...