They are, after all, situated in a densely populated area — 20 million people live within a 50 - mile radius — which means that, in the
unlikely event of a terrorist attack or a powerful
earthquake or some other catastrophic failure, we'll all turn into radioactive zombies.
I think a black swan
event is more like the failure
of the Fukushima nuclear plant, where a number
of unlikely events had to conflate (
earthquake + tsumani + failure
of the surge wall + backup generators in the basement) to cause — in this case — a disaster.