WASHINGTON - A tear on Sunday in a temporary berm allowed Missouri River flood waters to surround containment buildings and other vital areas of a Nebraska nuclear plant, but reactor systems were not affected.
The US Nuclear Regulatory Commission (NRC) said the breach in the 2,000-foot inflatable berm around the Fort Calhoun station occurred around 1:25 a.m. local time. More than 2 feet of water rushed in around containment buildings and electrical transformers at the 478-megawatt facility located 20 miles north of Omaha.
Crews activated emergency diesel generators after the breach, but restored normal electrical power by Sunday afternoon, the NRC said.
Buildings at the Fort Calhoun plant are watertight, the agency said. It noted that the cause of the berm breach is under investigation.