fort calhoun
[The water level at Ft. Calhoun nuclear plant] reached a height of nearly 1,007 feet above sea level at the plant yesterday. [...]
The NRC responded in its October 2010 letter that once flooding reached 1,004 feet, water would have entered the plant and the ability of emergency workers to move around the site would “significantly degrade.” [...]
At 1,010 feet, water would begin to enter the auxiliary building, “shorting power and submerging pumps. The plant could then experience a station blackout with core damage estimated within 15 to 18 hours,” under a worst-case scenario, the NRC said. [...]
http://www.nytimes.com/cwire/2011/06/24 ... gewanted=1