What I mean is that the fuel reprocessing designs aren’t miniaturizable, so government money wasn’t spent developing them because they couldn’t be used in aircr

What I mean is that the fuel reprocessing designs aren’t miniaturizable, so government money wasn’t spent developing them because they couldn’t be used in aircraft carriers or submarines. When civilian power plants were made, it was basically just scaled up military designs. The same contractors built both. Also the fact that we use uranium instead of the safer and more abundant thorium is because you can’t make thorium bombs. The reactors that have failed are these military derivative designs that lack safety features because there is no space for them in a submarine. No modern design has had such a failure, or could have such a failure since they have no reliance on active cooling and have safeguards to structurally prevent a core meltdown.