NIMBY is also another factor that delays new nuclear plants. That said, safety is another big concern here. Although not at an nuclear energy facility, there was that incident recently at Los Alamos National Laboratory researching nuclear weapons where they placed 8 rods of plutonium next to each other that could have triggered a disaster. Very high safety standards are required, and humans are known for making stupid decisions.
The Ministry for the Future by Kim Stanley Robinson is on my reading list, and the next book I’m reading after I finish Death’s End by Cixin Liu (not solarpunk, but hard scifi).