even the Japanese can't safely manage this technology,

Fukushima was a terrible design, where there is no passive failsafe - the reactor is still reacting after scram, and still getting hotter, but the heat no longer powers the cooling systems, which rely on external power that must be operating.

It's not Chernobyl bad, but, if you shouldn't need anything external to the reactor to keep it safe if disconnected from everything outside.