The problem with nuclear mistakes is they aren't a few decades. They can be measured in centuries.

So yeah. Regulation.

Don't build a damn LWR on a fault line (Fukushima) 3mile Island - don't have so many damn errors printing out that everything is ignore Chernobyl - we all know I think. It's still being worked on to contain it fully. Goiânia accident (brazil) - caesium-137 - Time magazine has identified the accident as one of the world's "worst nuclear disasters" and the International Atomic Energy Agency (IAEA) called it "one of the world's worst radiological incidents". (and this was just a radiation source, not a nuclear plant)

So yeah. Oil has bad disasters. Nuclear has EPIC disasters.

I think what is missing in your argument is not that these pieces are difficult. It's that combining all of them adds to a significant amount of complexity.

It's not JUST a heat exchanger. It's a heat exchanger that has to go through shielding. And it has to operate at much higher pressures than another type of power production facility would use. Which adds more complexity. And even greater need of safety.

I'm not arguing against Nuclear; I think it's incredibly worthwhile especially in the current age of AI eating up so much power in a constant use situation. But I do think it needs to be extremely regulated due to the risks of things going south.