One of the things about Fukushima that struck me was how the authorities downplayed the extent of damage and the radiation risk initially, just like what happened at Chernobyl. There is a lesson there for all of us. The other thing is that Fukushima got built where it did despite the historical record of monumental tsunamis hitting there. For these reasons I see all nuke plants as being ticking timebombs. The fact that there are little to no provisions to secure nuke plants in the event of a cyber attack taking down the grid is the greatest risk of course. My understanding is that most of the spent fuel pools are not hardened against such things as say a jihadi crashing a plane into one of them.