This morning, Exelon gave a presentation showing how their nuclear plants are prepared to respond to earthquakes, floods and tsunamis. Seven of Exelon’s 19 nuclear units are of the same design as the Fukushima-Daiichi units (GE BWR Mark 1). Below are several quotes and slides from the presentation:
The NRC requires all nuclear plants in the US to be able to withstand the most severe natural phenomena historically reported for each plant’s surrounding area, with a significant margin of error - slide 5
Be sure to check out the rest of the slide deck, there is more info on Exelon’s emergency procedures, spent fuel pools and dry cask storage.