is fort calhoun built in 1973 on the basis of a mistake. somebody miscalculated the pumping capacity they needed for a catastrophic flood. they discovered the errorรง thr years ago and planned the old system of flood protection, the nuclear regulatory commission calculated that it had a chance of protectsing the reactor core from a catastrophic flood, which is almost good enough. the fort calhoun nuclear power plant is now two feet below the level of the missouri river where the plant is required to shut down. the river is at about 1,006 feet above sea level. if it s above 1,014 feet it would knock out the generators and come over the specific berm that protects the spent nuclear fuel. don t worry. they say these 88-ton kafks,