After the 2,000 foot berm which collapsed on Sunday at the Fort Calhoun nuclear plant — from ABC News:
The breach allowed Missouri River flood waters to reach containment buildings and transformers and forcing the shutdown of electrical power.
Backup generators are cooling the nuclear material at the Fort Calhoun Nuclear Station.
The plant has not operated since April, and officials say there is no danger to the public.
The berm is the Aquadam, the huge inner-tube structure which was surrounding the plant. The WSJ reports electricity was restored, but I don’t see that reported anywhere else. NRC Chairman Gregory Jaczko is scheduled to visit the plant today:
The berm’s collapse allowed floodwaters to wash around the main electrical transformers. As a result, emergency diesel power generators were started. Later in the day, power was restored.
The NRC’s Mr. Dricks said temperature monitors were working properly and temperatures of key parts of the nuclear power plant were normal. Water has not seeped into any of the containment structures, he said.
Two NOUEs were submitted to the NRC:
46988: BOTH EMERGENCY DIESEL GENERATORS SUPPLYING PLANT EMERGENCY BUSES PER PLANT PROCEDURE
“At approximately 0125 [hrs. CDT], the AquaDam providing enhanced flood protection for FCS [Ft. Calhoun Station] Unit 1 failed. At 0221, as a precautionary measure, DG-2 [Diesel Generator] was automatically started per plant procedure to divorce bus 1A4 from offsite power. At 0250, DG-1 was automatically started to divorce bus 1A3. Both Emergency Diesel Generators loaded on buses as designed. 345KV and 161KV offsite power remain available.
“This is reportable pursuant to 10CFR50.72(b)(3)(iv)(A), ‘System Actuation of the Emergency Diesel Generators’. All safety related flood protection barriers remain in place.
“Current river level is 1006.5′ MSL and stable. FCS remains in a NOUE [Notification of Unusual Event] due to high river level.
46989: OFFSITE NOTIFICATION DUE TO PETROLEUM RELEASE TO THE MISSOURI RIVER
“At approximately 0125 CDT, the AquaDam providing enhanced flood protection for Fort Calhoun Station Unit 1 failed. This resulted in approximately 100 gallons of petroleum being released into the river after a protective barrier was breached and many fuel containers were washed out to the river. The fuel/oil containers were staged around the facility to supply fuel for pumps which remove water within the flood containment barriers. The spill was reported to the State of Nebraska at 10:45 AM CDT on 6/26/2011.
“This condition is being reported pursuant to 10 CFR 50.72(b)(2)(xi) for News Release or Notification of Other Government Agency. Applicable governmental agencies have been notified per plant procedures.”
The licensee notified the NRC Resident Inspector.