Hmmm. You propose that federal rules are the reason that plants are not built and the proof of that is that no plants are being built.
That is circular logic.
Well, let me steate what is KNOWN.
1. A company gets complete plans to build a nuclear reactor power plant.
2. The Atomic Energy Commission approves THOSE plans.
3. The AEC changes it's mind and forces the company to re-engineer and rebuild large parts of the project, often AFTER that portion has already been built even though no defect or problem has been shown to exist.
4. Repeat step #3 monthly for the next 20 years and MAYBE you will get your plant online.
NO ONE is even in the planning stages for a nuclear power plant because there is literally no way to budget for one. A project that ought to cost $900 million might end up costing $7 BILLION. It HAS happened time after time in the US.