It really didn't help that USA pretty much stopped all work on NPPs by 1980s, and IIRC (don't ask for link, don't have it now) doesn't allow NPPs on brownfield

It really didn't help that USA pretty much stopped all work on NPPs by 1980s, and IIRC (don't ask for link, don't have it now) doesn't allow NPPs on brownfield sites - i.e. you can't remove an old reactor, then build a new more modern one in its place, even if you updated everything to new norms. You have to get a new site, new planning, new acceptance, etc.