So given it is possible to create a nuclear power plant in 6 years (China did it, France did it), we just need to understand what needs to be done to make it possible again. And the answer is economy of scale (build more then one at a time) and streamlined bureaucracy (unify component requirement and simplify certification procedures).

The problem is nobody want to invest in the effort to make these changes against misinformed public opposition and fossil fuel lobbies.