ENS 46747
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ENS Event | |
|---|---|
14:15 Apr 12, 2011 | |
| Title | Unsealed Flood Barrier Penetration |
| Event Description | During investigations of flood barrier penetrations, a flood barrier sealing a diesel driven fire pump exhaust was found to be cracked. This exhaust pipe penetrates the west wall of the intake structure. Flooding through the penetration could have impacted the ability of the station's raw water 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 approximate elevation of 1012 feet mean sea level (MSL). The river level has been less than 997 feet MSL since prior to December 1, 2010. The raw 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 NRC Resident Inspector has been notified.
This event is being retracted. Additional review and evaluation determined that the seal flaw is above the station design flood level of 1014 feet mean sea level, and is therefore, not reportable. The NRC Resident Inspector has been notified. Notified R4DO (Hay). |
| Where | |
|---|---|
| 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:+0.32 h0.0133 days <br />0.0019 weeks <br />4.38336e-4 months <br />) | |
| Opened: | Erick Matzke 14:34 Apr 12, 2011 |
| NRC Officer: | Joe O'Hara |
| Last Updated: | Apr 20, 2011 |
| 46747 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
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