Event Notification Report for April 06, 2002
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
04/05/2002 - 04/06/2002
EVENT NUMBERS
38838
Power Reactor
Event Number: 38838
Facility: BROWNS FERRY
Region: 2 State: AL
Unit: [] [] [3]
RX Type: [1] GE-4,[2] GE-4,[3] GE-4
NRC Notified By: JOE BENNETT
HQ OPS Officer: LEIGH TROCINE
Region: 2 State: AL
Unit: [] [] [3]
RX Type: [1] GE-4,[2] GE-4,[3] GE-4
NRC Notified By: JOE BENNETT
HQ OPS Officer: LEIGH TROCINE
Notification Date: 04/06/2002
Notification Time: 20:37 [ET]
Event Date: 04/06/2002
Event Time: 13:14 [CST]
Last Update Date: 04/06/2002
Notification Time: 20:37 [ET]
Event Date: 04/06/2002
Event Time: 13:14 [CST]
Last Update Date: 04/06/2002
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
10 CFR Section:
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
RANDY MUSSER (R2)
RANDY MUSSER (R2)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 3 | A/R | N | 0 | Refueling | 0 | Refueling |
SPECIFIED SYSTEM ACTUATION -- FULL REACTOR SCRAM (WHILE SHUTDOWN) DURING THE PERFORMANCE OF CONTROL ROD DRIVE SYSTEM TESTING AND TROUBLESHOOTING
The following text is a portion of a facsimile received from the licensee:
"During [the] Unit 3 Cycle 10 Refueling outage, while performing 0-TI-20, CONTROL ROD DRIVE SYSTEM TESTING AND TROUBLESHOOTING, a full reactor scram occurred while resetting a half scram on channel 'B.' One rod was withdrawn and being inserted for timing [in accordance with (IAW)] 0-TI-20 and was at approximately position 26 when the scram occurred. The rod scrammed in as expected. All other rods were already fully inserted. The initial investigation indicates that during the resetting of the half scram, an auxiliary contact in the 'A' channel of [reactor protection system (RPS)] momentarily picked up in conjunction with a stuck contact in the 'B' channel, energizing the backup scram valves and initiating a scram on low scram pilot air header pressure. Testing IAW 0-TI-20 was stopped, and personnel were dispatched to investigate the cause of the loss of scram pilot air header pressure."
"This event is reportable as an 8-hour report per 10CFR50.72(b)(3)(iv)(A) as any event or condition that results in valid actuation of any of the systems listed in (b)(3)(iv)(B), specifically RPS. This is also reportable per 10CFR50.73(a)(2)(iv)(A) for the above conditions as 60-day written report."
The licensee stated that there was nothing unusual or misunderstood. The licensee also stated that all systems functioned as required.
The licensee notified the NRC resident inspector.
The following text is a portion of a facsimile received from the licensee:
"During [the] Unit 3 Cycle 10 Refueling outage, while performing 0-TI-20, CONTROL ROD DRIVE SYSTEM TESTING AND TROUBLESHOOTING, a full reactor scram occurred while resetting a half scram on channel 'B.' One rod was withdrawn and being inserted for timing [in accordance with (IAW)] 0-TI-20 and was at approximately position 26 when the scram occurred. The rod scrammed in as expected. All other rods were already fully inserted. The initial investigation indicates that during the resetting of the half scram, an auxiliary contact in the 'A' channel of [reactor protection system (RPS)] momentarily picked up in conjunction with a stuck contact in the 'B' channel, energizing the backup scram valves and initiating a scram on low scram pilot air header pressure. Testing IAW 0-TI-20 was stopped, and personnel were dispatched to investigate the cause of the loss of scram pilot air header pressure."
"This event is reportable as an 8-hour report per 10CFR50.72(b)(3)(iv)(A) as any event or condition that results in valid actuation of any of the systems listed in (b)(3)(iv)(B), specifically RPS. This is also reportable per 10CFR50.73(a)(2)(iv)(A) for the above conditions as 60-day written report."
The licensee stated that there was nothing unusual or misunderstood. The licensee also stated that all systems functioned as required.
The licensee notified the NRC resident inspector.