ENS 46674
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ENS Event | |
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20:56 Mar 15, 2011 | |
Title | Flood Barrier Penetration Not Sealed |
Event Description | During investigations of flood barrier penetrations, a 4 inch conduit has been identified that is not sealed. This conduit penetrates the South wall of the auxiliary building near the transformers into room 19. Flooding through the penetrations could have impacted the ability of the station's auxiliary feedwater (AFW) pumps to perform their design accident mitigation functions.
This eight-hour notification is being made pursuant to 10 CFR 50.72 (b)(3)(v). The penetration is at an elevation of 1007'-8". The river level has been less than 995 feet Mean Sea Level (MSL) since prior to December 1, 2010. The AFW pumps are operable. There are not any indications of conditions that might result in a flood. Actions are in progress to plug the penetration. The licensee has notified the NRC Resident Inspector.
Further investigation has determined that the penetration is adequately sealed inside of the affected structure. Therefore this notification is being retracted. The licensee will notify the NRC Resident Inspector. Notified R4DO (Walker). |
Where | |
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Fort Calhoun ![]() Nebraska (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+-4.52 h-0.188 days <br />-0.0269 weeks <br />-0.00619 months <br />) | |
Opened: | Erick Matzke 16:25 Mar 15, 2011 |
NRC Officer: | John Knoke |
Last Updated: | May 13, 2011 |
46674 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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