Fort Calhoun flood berm collapses

The U.S. Nuclear Regulatory Commission is monitoring events at the 500 MW Fort Calhoun nuclear power plant near Omaha after a protective berm holding back floodwaters from the Missouri River collapsed on June 26.

The plant, operated by Omaha Public Power District, remains in a safe mode under an Unusual Event declared on June 6 because of flooding along the river.

The 2,000-foot long water-filled berm collapsed, which allowed floodwaters to surround auxiliary and containment buildings and main electrical transformers. The buildings are designed to withstand water levels of 1,014 ft. mean sea level. Operators also transferred power from offsite sources to the emergency diesel generators as a precautionary measure. The Missouri River is currently at 1,006.3 ft. and levels are not expected to rise above 1,008 ft.

NRC inspectors were onsite at the time and responded to the event. They verified that reactor shutdown cooling and spent fuel pool cooling remain unaffected. NRC also activated its Incident Response Center from which it is monitoring events.

For flood preparation video from Omaha Public Power District taken June 4, click here

For video from June 8, click here

For video covering June 10-16, click here

For Nebraska Public Power District flood preparation video, click here

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