ENS 49729
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ENS Event | |
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17:07 Jan 15, 2014 | |
Title | Loss of Secondary Containment Differential Pressure |
Event Description | Reactor Building (Secondary Containment) pressure increased to above the Technical Specification Surveillance requirement of 0.25 inches vacuum water gauge briefly (5 minutes or less). This 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. Reactor Building pressure has been restored to normal (greater than 0.25 inches vacuum water gauge), returning Secondary Containment to operable status. Highest actual value was 0.21 inches vacuum water gauge.
There were no radiological releases associated with the event. The differential pressure change is believed to have been caused by a momentary shift in Heating and Ventilation Systems dampers. The licensee has notified the NRC Resident Inspector. |
Where | |
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Columbia ![]() 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 | |
Time - Person (Reporting Time:+-0.5 h-0.0208 days <br />-0.00298 weeks <br />-6.849e-4 months <br />) | |
Opened: | Matt Hummer 16:37 Jan 15, 2014 |
NRC Officer: | John Shoemaker |
Last Updated: | Jan 15, 2014 |
49729 - 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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