Then you are mistaken. At Fukushima, no less, there were reports about how an engineer held things up until his demands to improve the safety of some system were met. And his demands were met.

Certainly, there are a lot of things we have learned since that plant was designed that could be done better and if it had been just a tiny bit better, there wouldn't have been any leaks at all. But we can make plants a lot stronger these days. And we probably should be doing exactly that.