ENS 48295
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ENS Event | |
|---|---|
19:43 Sep 10, 2012 | |
| Title | Loss of Secondary Containment |
| Event Description | At 1443 CDT, indication was received in the Control Room that both the inner and outer personnel access doors to the Reactor Building were open simultaneously. This caused entry into Technical Specification 3.6.4.1 for Secondary Containment inoperable and is a loss of safety function per station procedure 2.0.11.1. An event or condition that could have prevented fulfillment of a safety function requires an 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> report per 10CFR50.72.b.3.v.D for Accident Mitigation. The doors were open for several minutes until station personnel could reset the interlock to allow for door closure. The doors were reclosed and Secondary Containment was restored to operable at 1451 CDT.
The NRC Resident Inspector has been informed of this condition. |
| Where | |
|---|---|
| Cooper Nebraska (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| LER: | 05000298/LER-2012-003 Regarding Reactor Building Doors Opened Simultaneously Causes Loss of Safety Function 05000397/LER-2012-007 For Columbia Generating Station Regarding Secondary Containment Inoperable Due to Both Airlock Doors Being Open |
| Time - Person (Reporting Time:+2.4 h0.1 days <br />0.0143 weeks <br />0.00329 months <br />) | |
| Opened: | Steve Wheeler 22:07 Sep 10, 2012 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Sep 10, 2012 |
| 48295 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
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