Because old nuclear power stations are coming to end of life, and new nuclear power stations appear to be ruinously expensive. See Flamanville which was supposed to be finished about 10 years and €10bn ago.
The real idiocy in Germany was retiring the nuclear plants before EOL. If you’re trying to work out whether to replace old nuclear with new it’s much less easy to come to a clear answer. Britain has had the same issue, most people are quite enthusiastic about new nuclear but it’s just really expensive.
It’s the issue with most of these small-n construction projects. Perhaps modular nuclear can be a solution.
Because there are serious problems with the disposal of highly radioactive waste.
As of now there is no proper solution in Europe for the disposal of that stuff.
There are a few, work in progress, storage facilities like Asse in Germany which are blocked by local politics.
Lots of the stuff just circles around on the European rail network on its way from temporary storage to temporary storage.
On top these French and especially the Belgian nuclear reactors are in a horrible state. Just have a look at Thiange and you would never want to be near that thing.
And did I say the Belgians have no idea what to do whith the waste too.
What? Why?