Right after Fukushima the whole Nuclear industry started what was called the Fukushima
mods.

They first took into account where a plant was located, and what natural disasters does that region get hit with.
Every plant can take a hit from a natural disaster but as Fukushima proved, not from 2 or more natural disasters at the same time

So they not only fixed that, but went as far as to account for not only getting hit by 2 or more natural disasters at the same time but thought wonder if while we are getting hit by these natural disasters if Man Attacks

So they went as far as all natural disasters and a terrorist attack at the same time protection.
aka The Fukushima
mods