Event Notification Report for September 17, 2011
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
09/16/2011 - 09/17/2011
EVENT NUMBERS
48005
Power Reactor
Event Number: 48005
Facility: COLUMBIA GENERATING STATION
Region: 4 State: WA
Unit: [2] [] []
RX Type: [2] GE-5
NRC Notified By: MOT HEDGES
HQ OPS Officer: DONALD NORWOOD
Region: 4 State: WA
Unit: [2] [] []
RX Type: [2] GE-5
NRC Notified By: MOT HEDGES
HQ OPS Officer: DONALD NORWOOD
Notification Date: 06/07/2012
Notification Time: 19:16 [ET]
Event Date: 09/17/2011
Event Time: 12:00 [PDT]
Last Update Date: 06/07/2012
Notification Time: 19:16 [ET]
Event Date: 09/17/2011
Event Time: 12:00 [PDT]
Last Update Date: 06/07/2012
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
HEATHER GEPFORD (R4DO)
HEATHER GEPFORD (R4DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | N | 0 | Cold Shutdown | 0 | Cold Shutdown |
MAJOR LOSS OF EMERGENCY ASSESSMENT CAPABILITY DUE TO DEGRADED DOSE PROJECTION
"On September 17, 2011, a root cause analysis identified that errors in the dose projection software gain factor associated with the high range stack monitor were introduced in 2000 and had the potential to produce inaccurate dose projection results. The resulting condition could have impacted the ability to accurately assess ongoing releases and determine appropriate protective measures for the public. The gain factors were corrected in October 2011 and dose projection capabilities have been restored.
"This condition was not originally recognized as being reportable in accordance with 10 CFR 50.72(b)(3)(xiii) due to the limited nature of the impact to a small portion of the radiological effluent EALs, however, it has been recently determined to be reportable. This late identification of reportability has been entered into our corrective action program."
The licensee will notify the NRC Resident Inspector.
"On September 17, 2011, a root cause analysis identified that errors in the dose projection software gain factor associated with the high range stack monitor were introduced in 2000 and had the potential to produce inaccurate dose projection results. The resulting condition could have impacted the ability to accurately assess ongoing releases and determine appropriate protective measures for the public. The gain factors were corrected in October 2011 and dose projection capabilities have been restored.
"This condition was not originally recognized as being reportable in accordance with 10 CFR 50.72(b)(3)(xiii) due to the limited nature of the impact to a small portion of the radiological effluent EALs, however, it has been recently determined to be reportable. This late identification of reportability has been entered into our corrective action program."
The licensee will notify the NRC Resident Inspector.