For nuke plants things like earthquakes and apparently Tsunamis are bad. I doubt a tornado could do much to them except for minor damage. Biggest threats to them otherwise seem to be multiple failures within as they have redundant systems. Of course there are several different types of designs. What I want is a reactor that i can load with everyone's trash and garbage, use it to produce electricity, compost, recyclables and clean water, at a low design and build cost, and cheap/easy to operate. Is that too much to ask. Some of the landfills that use the methane produced to run generators, heat buildings etc. Well that is awesome just not practical on a large scale sadly.