Event Notification Report for September 03, 2008
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
09/02/2008 - 09/03/2008
EVENT NUMBERS
44463
Power Reactor
Event Number: 44463
Facility: BROWNS FERRY
Region: 2 State: AL
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4,[3] GE-4
NRC Notified By: RICKY GIVINS
HQ OPS Officer: PETE SNYDER
Region: 2 State: AL
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4,[3] GE-4
NRC Notified By: RICKY GIVINS
HQ OPS Officer: PETE SNYDER
Notification Date: 09/04/2008
Notification Time: 05:04 [ET]
Event Date: 09/03/2008
Event Time: 23:43 [CDT]
Last Update Date: 09/04/2008
Notification Time: 05:04 [ET]
Event Date: 09/03/2008
Event Time: 23:43 [CDT]
Last Update Date: 09/04/2008
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):
REBECCA NEASE (R2)
REBECCA NEASE (R2)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
FAILURE OF DAMPERS TO AUTO CLOSE
"Due to RPS A Circuit Protector surveillance testing, a transfer of 'A' Reactor Protection System from alternate power supply back to the 1A RPS MG-set was required. An expected group 6 containment isolation signal was received during the power transfer. Upon review of plant status to ensure systems responded as expected, it was determined that reactor ventilation zone exhaust dampers 1-DMP-64-42 and 1-DMP-64-43 (Inboard and Outboard Reactor Zone Exhaust Dampers) failed to auto-close. Isolation of these dampers is a required safety function.
"The dampers were administratively closed and deactivated in accordance with plant technical specification 3.6.4.2 action B. At the time of this report the cause for failure to auto close has not been determined."
The licensee notified the NRC Resident Inspector.
"Due to RPS A Circuit Protector surveillance testing, a transfer of 'A' Reactor Protection System from alternate power supply back to the 1A RPS MG-set was required. An expected group 6 containment isolation signal was received during the power transfer. Upon review of plant status to ensure systems responded as expected, it was determined that reactor ventilation zone exhaust dampers 1-DMP-64-42 and 1-DMP-64-43 (Inboard and Outboard Reactor Zone Exhaust Dampers) failed to auto-close. Isolation of these dampers is a required safety function.
"The dampers were administratively closed and deactivated in accordance with plant technical specification 3.6.4.2 action B. At the time of this report the cause for failure to auto close has not been determined."
The licensee notified the NRC Resident Inspector.