Event Notification Report for June 30, 2022
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
06/29/2022 - 06/30/2022
EVENT NUMBERS
55973
55973
Power Reactor
Event Number: 55973
Facility: Grand Gulf
Region: 4 State: MS
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: Paul Lyne
HQ OPS Officer: Brian P. Smith
Region: 4 State: MS
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: Paul Lyne
HQ OPS Officer: Brian P. Smith
Notification Date: 06/30/2022
Notification Time: 18:07 [ET]
Event Date: 06/30/2022
Event Time: 14:45 [CDT]
Last Update Date: 06/30/2022
Notification Time: 18:07 [ET]
Event Date: 06/30/2022
Event Time: 14:45 [CDT]
Last Update Date: 06/30/2022
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS Actuation - Critical 50.72(b)(3)(iv)(A) - Valid Specif Sys Actuation
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS Actuation - Critical 50.72(b)(3)(iv)(A) - Valid Specif Sys Actuation
Person (Organization):
Warnick, Greg (R4DO)
Warnick, Greg (R4DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | M/R | Y | 100 | Power Operation | 0 | Hot Standby |
EN Revision Imported Date: 7/1/2022
EN Revision Text: MANUAL SCRAM DUE TO LOSS OF TRANSFORMER
The following information was provided by the licensee via phone and email:
"At 1445 [CDT] on June 30, 2022, with Grand Gulf Nuclear Station in Mode 1 and at 100 percent power, the reactor was manually scrammed due to the loss of balance of plant (BOP) transformer 23. All control rods fully inserted into the core and all systems responded appropriately.
"Reactor level is being maintained with condensate and feedwater. Reactor pressure is being maintained with turbine bypass valves. The cause of the loss of BOP transformer 23 is under investigation at this time.
"Standby Service Water 'A' and 'B' were manually initiated to supply cooling to Control Room A/C, ESF switchgear room coolers, and plant auxiliary loads.
"This event is being reported under 10 CFR 50.72(b)(2)(iv)(B) as an event or condition that resulted in actuation of the Reactor Protection System and 10 CFR 50.72(b)(3)(iv)(A) due to the actuation of Standby Service Water.
"The NRC Senior Resident Inspector was notified."
EN Revision Text: MANUAL SCRAM DUE TO LOSS OF TRANSFORMER
The following information was provided by the licensee via phone and email:
"At 1445 [CDT] on June 30, 2022, with Grand Gulf Nuclear Station in Mode 1 and at 100 percent power, the reactor was manually scrammed due to the loss of balance of plant (BOP) transformer 23. All control rods fully inserted into the core and all systems responded appropriately.
"Reactor level is being maintained with condensate and feedwater. Reactor pressure is being maintained with turbine bypass valves. The cause of the loss of BOP transformer 23 is under investigation at this time.
"Standby Service Water 'A' and 'B' were manually initiated to supply cooling to Control Room A/C, ESF switchgear room coolers, and plant auxiliary loads.
"This event is being reported under 10 CFR 50.72(b)(2)(iv)(B) as an event or condition that resulted in actuation of the Reactor Protection System and 10 CFR 50.72(b)(3)(iv)(A) due to the actuation of Standby Service Water.
"The NRC Senior Resident Inspector was notified."