If you built nuclear at scale, then these problems solve themselves. Just as France solved them in 15 years in the 70/80s.
Just as these problems were solved for solar/wind by economics of scale.
Solar/wind was not economical, it was basically forced into being economical by creating economics of scale.
That said, well, they stopped building new reactors, most of their reactors were built in 15 years in the 70/80s. Since then they have not done as much as they should have and all those reactors are starting to need more maintenance now.
Because they have not built much new things, they don't have as many people with knowledge as they used to.
But they are managing most of these issues pretty well overall.
I would say France did pretty well having 40 years of green energy.