ENS 46595
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ENS Event | |
|---|---|
04:17 Feb 6, 2011 | |
| Title | Both Trains of Auxiliary Feed Water Disabled |
| Event Description | On February 5, 2011, both trains of the Auxiliary Feed Water system were disabled while transitioning from Auxiliary Feed Water to Main Feed Water during plant start up. While performing OI-AFW-4 attachment 3, FW-6 Electric Driven AFW Pump Operations, both Steam Generator Auxiliary Feed Water inlet valves (HCV-1107A and HCV-1108A) control switches were placed in 'CLOSE'. This action defeated the Auxiliary Feedwater Actuation Signal (AFAS) ability to open the valves, rendering both trains of Auxiliary Feed Water to the Steam Generators inoperable. The condition was subsequently recognized and the control switches were placed in 'AUTO' restoring both trains to operable. The duration of the condition was 3 minutes from start to finish. Reference Fort Calhoun Station Condition Report 2011-0839.
This eight-hour notification is being made pursuant to 10 CFR 50.72(b)(3)(v)(B). The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
| Fort Calhoun Nebraska (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat | |
| Time - Person (Reporting Time:+-0.67 h-0.0279 days <br />-0.00399 weeks <br />-9.17766e-4 months <br />) | |
| Opened: | Scott Moeck 03:37 Feb 6, 2011 |
| NRC Officer: | Dong Park |
| Last Updated: | Feb 6, 2011 |
| 46595 - NRC Website
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