Event Notification Report for October 03, 2016
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
10/02/2016 - 10/03/2016
EVENT NUMBERS
52276
Power Reactor
Event Number: 52276
Facility: COLUMBIA GENERATING STATION
Region: 4 State: WA
Unit: [2] [] []
RX Type: [2] GE-5
NRC Notified By: DAN SHARPE
HQ OPS Officer: MARK ABRAMOVITZ
Region: 4 State: WA
Unit: [2] [] []
RX Type: [2] GE-5
NRC Notified By: DAN SHARPE
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 10/03/2016
Notification Time: 16:49 [ET]
Event Date: 10/03/2016
Event Time: 10:08 [PDT]
Last Update Date: 10/03/2016
Notification Time: 16:49 [ET]
Event Date: 10/03/2016
Event Time: 10:08 [PDT]
Last Update Date: 10/03/2016
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(C) - POT UNCNTRL RAD REL
10 CFR Section:
50.72(b)(3)(v)(C) - POT UNCNTRL RAD REL
Person (Organization):
GREG WERNER (R4DO)
GREG WERNER (R4DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
LOSS OF SECONDARY CONTAINMENT VACUUM FOR FOUR MINUTES
"On October 3, 2016, at 1008 PDT a Reactor Building Exhaust Valve (REA-V-1) unexpectedly closed, which caused the Technical Specification (TS) for secondary containment pressure boundary to not be met. The duration of time that the secondary containment TS was not met was approximately 4 minutes.
"Secondary containment differential pressure was restored within TS requirement of greater than or equal to 0.25 inches of vacuum water gauge at approximately 1012 PDT by manually starting Standby Gas Treatment (SGT) system (SYS) A. The cause of the REA-V-1 closure is currently under investigation.
"This condition is being reported under 10CFR50.72(b)(3)(v)(C) for an event or condition that could have prevented fulfillment of a safety function needed to control the release of radioactive material.
"The licensee has notified the NRC Resident Inspector."
"On October 3, 2016, at 1008 PDT a Reactor Building Exhaust Valve (REA-V-1) unexpectedly closed, which caused the Technical Specification (TS) for secondary containment pressure boundary to not be met. The duration of time that the secondary containment TS was not met was approximately 4 minutes.
"Secondary containment differential pressure was restored within TS requirement of greater than or equal to 0.25 inches of vacuum water gauge at approximately 1012 PDT by manually starting Standby Gas Treatment (SGT) system (SYS) A. The cause of the REA-V-1 closure is currently under investigation.
"This condition is being reported under 10CFR50.72(b)(3)(v)(C) for an event or condition that could have prevented fulfillment of a safety function needed to control the release of radioactive material.
"The licensee has notified the NRC Resident Inspector."