ENS 48131
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ENS Event | |
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18:22 Jul 24, 2012 | |
Title | Loss of Secondary Containment Differential Pressure Due to the Trip of Secondary Containment Supply and Exhaust Fans |
Event Description | Reactor Building (Secondary Containment) Supply Fan 1B (ROA-FN-1B) and Reactor Building Exhaust Fan 1B (REA-FN-1B) inadvertently tripped. Secondary containment pressure exceeded atmospheric pressure which does not meet the surveillance requirement to have secondary containment vacuum greater than or equal to 0.25 inches of water vacuum. This event is reportable as an event that could have prevented fulfillment of a safety function needed to control the release of radiation and mitigate the consequences of an accident. Alternate supply and exhaust fans were manually started within 4 minutes and Secondary Containment pressure was restored to normal (greater than 0.25 inches water vacuum) within 5 minutes, returning Secondary Containment to operable status.
Event investigation is on-going to determine exact cause of the fans tripping; however, electrical maintenance activities were in progress at the time. There were no radiological releases associated with the event. No safety system actuations or isolations occurred. The licensee notified the NRC Resident Inspector. |
Where | |
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Columbia Generating Station Washington (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
LER: | 05000397/LER-2012-003 |
Time - Person (Reporting Time:+1.12 h0.0467 days <br />0.00667 weeks <br />0.00153 months <br />) | |
Opened: | Ryan Oakes 19:29 Jul 24, 2012 |
NRC Officer: | Donald Norwood |
Last Updated: | Jul 24, 2012 |
48131 - NRC Website
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Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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