Kinda. I'm in favor of using more nuclear power but I am concerned that the current designs (all?) require active cooling, even post power down, for extended pe

Kinda. I'm in favor of using more nuclear power but I am concerned that the current designs (all?) require active cooling, even post power down, for extended periods of time. We saw with Fukushima how that can go wrong. How do you deal with the situation where the electric grid goes down for multiple days or weeks for whatever reason?