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The 2,000-foot berm collapsed about 1:25 a.m. Sunday due to “onsite activities,” OPPD officials said. The Aqua Dam provided supplemental flood protection and was not required under NRC regulations.
According to the NRC, the berm was eight-feet tall and 16-feet wide at the base. It was designed to provide protection for the plant's "powerblock" for up to six feet of water. Crews will look at whether it can be patched, OPPD officials said.
“We put up the aqua-berm as additional protection,” said OPPD spokesman Mike Jones. “(The plant) is in the same situation it would have been in if the berm had not been added. We're still within NRC regulations.”
"Hanson said the "aqua dam" was a supplemental measure that provided workers "more freedom" but was not essential to keeping the plant dry."
Assistant Omaha Fire Chief Dan Stolinski said the city got about 2.5 inches of rain in six hours, causing water to pool near the stadium hosting the College World Series.
Some areas reported three inches of rain. There was significant pooling of water behind the Omaha levee and in Council Bluffs they were working to strengthen perceived weak spots in the barrier.
Auxiliary building at Ft. Calhoun surrounded by water after berm failure — NRC letter said if water enters auxilary building, could have station blackout with core damage in hours
According to the NRC, the berm was eight-feet tall and 16-feet wide at the base. It was designed to provide protection for the plant's "powerblock" for up to six feet of water. Crews will look at whether it can be patched, OPPD officials said.
On Sunday, floodwater surrounded the nuclear plant's main electrical transformers, and power was transferred to emergency diesel generators.
Efforts were underway to reconnect to offsite power once all safety checks have been completed.
The floodwaters also surrounded auxiliary and containment buildings, which are designed to handle water up to 1,014 feet above sea level. The Missouri River is at 1,006.3 feet and isn't expected to exceed 1008 feet.
...
In a statement released Wednesday, the NRC said there is a separate, earthen berm to protect the electrical switchyard and a concrete barrier surrounding electrical transformers.
The floodwaters also surrounded auxiliary and containment buildings, which are designed to handle water up to 1,014 feet above sea level. The Missouri River is at 1,006.3 feet and isn't expected to exceed 1008 feet.
Originally posted by Nosred
reply to post by butcherguy
The floodwaters also surrounded auxiliary and containment buildings, which are designed to handle water up to 1,014 feet above sea level. The Missouri River is at 1,006.3 feet and isn't expected to exceed 1008 feet.
About what? That the water won't rise above 1,014 feet?
Well, I guess you guys have a right to worry since when nothing happens you're all going to look like idiots.
Edit: And then I get to say, "I told you so". And I will say it.edit on 26-6-2011 by Nosred because: (no reason given)
Originally posted by Nosred
reply to post by butcherguy
The floodwaters also surrounded auxiliary and containment buildings, which are designed to handle water up to 1,014 feet above sea level. The Missouri River is at 1,006.3 feet and isn't expected to exceed 1008 feet.
About what? That the water won't rise above 1,014 feet?
Well, I guess you guys have a right to worry since when nothing happens you're all going to look like idiots.
Edit: And then I get to say, "I told you so". And I will say it.edit on 26-6-2011 by Nosred because: (no reason given)