> It isn't like you have to blow up the reactor itself to disable a foreign nuclear plant. I see no reason why anybody would ever target a reactor core. There is a HUGE amount of electrical substation infrastructure outside of these plants which would take like 1/1000 the effort to damage or blow up as the reactor core itself and would shut the whole thing down.

If you attack that infrastructure, the core will melt down without suffering a direct attack.

IIRC, that's what happened at Fukushima: a tsunami took out the backup generators, which shut down the core cooling system, which then led to the core overheating and melting down.