ENS 46689
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ENS Event | |
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15:58 Mar 22, 2011 | |
Title | Containment Coolers Declared Inoperable |
Event Description | At 10:58 CDT, today during the performance of IC-ST-IA-3010B, I&C found NG-HCV-400A-A3, CCW INLET VALVE HCV-400A NITROGEN SUPPLY ISOLATION VALVE, closed which is required to remain open for VA-3A to remain operable. This valve supplies backup nitrogen to VA-3A CCW cooler isolation valve HCV-400A on loss of instrument air to maintain cooling flow to the ventilation during an accident condition. While the nitrogen valve NG-HCV-400A-A3 was closed, performance of IC-ST-IA-3010B on VA-3B, CONTAINMENT AIR RECIR FAN, placed the containment cooler in an inoperable status. This led to Technical Specification 2.0.1 entry due to both trains of cooling being inoperable. The cause for the mispositioning of NG-HCV-400A-A3 is unknown at this time. The inoperability of VA-3A along with VA-3B rendered the containment cooling trains unavailable to perform their safety function during an accident condition. This condition is being reported pursuant to 10 CFR 50.72(b)(3)(V)(D) for mitigating the consequences of an accident. FCS entered into Technical Specification at 10:58 CDT and exited Technical Specification at 11:14 CDT.
The licensee notified the NRC Resident Inspector. |
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:+-1.6 h-0.0667 days <br />-0.00952 weeks <br />-0.00219 months <br />) | |
Opened: | Robert Kros 14:22 Mar 22, 2011 |
NRC Officer: | Mark Abramovitz |
Last Updated: | Mar 22, 2011 |
46689 - 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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