22:02 Nov 20, 2016
Secondary Containment Differential Pressure Less than Technical Specification Requirement
On November 20, 2016 at 1402 PST, Reactor Building Exhaust Air Fan 1B, REA-FN-1B, failed to start in manual which caused the Technical Specification (TS) for secondary containment pressure boundary to not be met. The duration of the time that the secondary containment TS was not met was approximately less than one minute. REA-FN-1B was being started in manual during a shift of Reactor Building Ventilation to support a post-maintenance support task on REA-FN-1B.
The cause of REA-FN-1B failing to start is currently under investigation.
This condition is being reported under 10 CFR 50.72(b)(3)(v)(C) and 10 CFR 50.72(b)(3)(v)(D) for an event or condition that could have prevented fulfillment of a safety function needed to control the release of radioactive material and accident mitigation.The licensee has notified the NRC Resident Inspector.
|Columbia Generating Station |
Washington (NRC Region 4)
|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:+-3.15 h-0.131 days <br />-0.0187 weeks <br />-0.00431 months <br />)|
18:53 Nov 20, 2016
|NRC Officer:||Donald Norwood|
|Last Updated:||Nov 20, 2016|
|52382 - NRC Website|