Depends. People don't understand the idea of learning curves related to nuclear. If you don't fix your problems in second build you'll still make same mistakes. On the other hand if you do proper planning you can achieve instantly N of a kind costs, like first japanese ABWR.

Ren infra has own risks too. For example concentration in best weather areas. Most ren infra in Ukraine was in the south and was either captured or destroyed by Russia. There are similar risks in for north sea/offshore projects