Numerous American nuclear reactors are built within flood zones:
Numerous dam failures have occurred within the U.S.:
Reactors in Nebraska and elsewhere were flooded by swollen rivers and almost melted down. See this,this, this and this.
The Huntsville Times wrote in an editorial last year:
A tornado or a ravaging flood could just as easily be like the tsunami that unleashed the final blow [at Fukushima as an earthquake].
An engineer with the NRC says that a reactor meltdown is an “absolute certainty” if a dam upstream of a nuclear plant fails … and that such a scenario is hundreds of times more likely than the tsunami that hit Fukushima :
An engineer with the Nuclear Regulatory Commission (NRC) … Richard Perkins, an NRC reliability and risk engineer, was the lead author on a July 2011 NRC report detailing flood preparedness. He said the NRC blocked information from the public regarding the potential for upstream dam failures to damage nuclear sites.
Perkins, in a letter submitted Friday with the NRC Office of Inspector General, said that the NRC “intentionally mischaracterized relevant and noteworthy safety information as sensitive, security information in an effort to conceal the information from the public.”The Huffington Post first obtained the letter.