Policies differ between EU countries. Finland just brought a reactor online. France is planning to build 14 reactors in the next decade. On the other hand Germany is going to shut down 3 reactors.
As I understand it a large problem has been with poor quality welds being caught too late in the process.
Quality isn’t an easy thing to change, but I trust they can remedy for future builds.
Plants built during the nuclear boom in the 1960s and early 70s often had inflation -adjusted costs of 1-2 billion USD per GW of capacity. And that's with no intermittency and a capacity factor of over 90%.