Event Notification Report for December 31, 2011
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
12/30/2011 - 12/31/2011
EVENT NUMBERS
47564
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 47564
Facility: DIABLO CANYON
Region: 4 State: CA
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: MICHAEL KENNEDY
HQ OPS Officer: BILL HUFFMAN
Region: 4 State: CA
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: MICHAEL KENNEDY
HQ OPS Officer: BILL HUFFMAN
Notification Date: 12/31/2011
Notification Time: 11:53 [ET]
Event Date: 12/31/2011
Event Time: 02:00 [PST]
Last Update Date: 01/04/2012
Notification Time: 11:53 [ET]
Event Date: 12/31/2011
Event Time: 02:00 [PST]
Last Update Date: 01/04/2012
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
Person (Organization):
GREG WERNER (R4DO)
GREG WERNER (R4DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
FIRE BARRIER RATING OF VITAL SWTICHGEAR WALLS MAY NOT MEET STANDARDS
"On December 31, 2011 at 0200 PST, a plant employee indentified the fire barrier material in each unit was potentially not qualified as a 3 hour rated fire barrier as specified by the Diablo Canyon power plant fire protection program. The fire barrier material in question is installed between the block wall portion of the barrier and the door frames in the walls separating three of the 480 Volt switchgear buses and separating the three vital instrument AC inverters. The condition was discovered by a plant employee who questioned the configuration while performing a routine tour of that area. Operators confirmed existing fire watches were in place and established additional fire watches as compensatory measures as required by the Diablo Canyon fire protection program.
"A review of the Appendix R fire protection analysis is in progress to confirm the rating of the installed configuration.
"The licensee has notified the NRC Resident Inspector."
* * * RETRACTION FROM CRAIG HARVEY TO DONALD NORWOOD At 1955 EST on 1/4/2012 * * *
"This is an update to EN 47564 reported on 12/31/11 where it was reported that plant personnel had identified rated fire barriers were not qualified as a three hour rated barrier as required by the DCPP Fire Protection Program.
"On 1/3/12 plant personnel provided barrier design drawings to the manufacturer of the DCPP fireproofing material. The manufacturer reviewed the design detail and confirmed that the barrier design depicted on the drawing is qualified as a 3 hour barrier. Therefore no unanalyzed condition that significantly degraded plant safety existed. This event is being retracted.
"The licensee notified the NRC Resident Inspector."
Notified R4DO (Vasquez).
"On December 31, 2011 at 0200 PST, a plant employee indentified the fire barrier material in each unit was potentially not qualified as a 3 hour rated fire barrier as specified by the Diablo Canyon power plant fire protection program. The fire barrier material in question is installed between the block wall portion of the barrier and the door frames in the walls separating three of the 480 Volt switchgear buses and separating the three vital instrument AC inverters. The condition was discovered by a plant employee who questioned the configuration while performing a routine tour of that area. Operators confirmed existing fire watches were in place and established additional fire watches as compensatory measures as required by the Diablo Canyon fire protection program.
"A review of the Appendix R fire protection analysis is in progress to confirm the rating of the installed configuration.
"The licensee has notified the NRC Resident Inspector."
* * * RETRACTION FROM CRAIG HARVEY TO DONALD NORWOOD At 1955 EST on 1/4/2012 * * *
"This is an update to EN 47564 reported on 12/31/11 where it was reported that plant personnel had identified rated fire barriers were not qualified as a three hour rated barrier as required by the DCPP Fire Protection Program.
"On 1/3/12 plant personnel provided barrier design drawings to the manufacturer of the DCPP fireproofing material. The manufacturer reviewed the design detail and confirmed that the barrier design depicted on the drawing is qualified as a 3 hour barrier. Therefore no unanalyzed condition that significantly degraded plant safety existed. This event is being retracted.
"The licensee notified the NRC Resident Inspector."
Notified R4DO (Vasquez).