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The personnel-pinned-to-the-roof accident was https://en.wikipedia.org/wiki/SL-1 and the accident was 59 years ago. While I'm not sure that nuclear power from Uranium or Plutonium fission will ever be safe enough, I wouldn't assume or imply that an accident 59 years ago dooms the project.

Pretty sure the ML-1 was the shippable one. It was gas-cooled and portable. The SL-1 that had the accident was a BWR intended to power arctic radar stations above the DEW line. Too big to ship easily. These two reactors were part of the same Army program.

https://whatisnuclear.com/reactor_history.html#the-army-nucl...

M meant mobile. S meant stationary. L means low-power.

Is that the Three Mile Island incident you're talking about? I'm genuinely curious, though thought that was a full scale reactor

I believe dfox is referring to this incident: https://en.wikipedia.org/wiki/SL-1#Accident_and_response