[justa-hairyape]

If sandbags are required to keep nuclear reactors safe, there might be some design problems.

[chimera]

“Design problems”? You gotta be kidding me. The Ft. Calhoun plant has a nine-fold redundancy in backup power. Cooper plant has similar redundant systems. Is a nine-fold redundancy enough for you? Sandbags or no, there isn't going to be a problem keeping things cooled down.