Event Notification Report for March 15, 2025
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
03/14/2025 - 03/15/2025
EVENT NUMBERS
57609
57609
Power Reactor
Event Number: 57609
Facility: Grand Gulf
Region: 4 State: MS
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: Mike Riehl
HQ OPS Officer: Sam Colvard
Region: 4 State: MS
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: Mike Riehl
HQ OPS Officer: Sam Colvard
Notification Date: 03/15/2025
Notification Time: 15:32 [ET]
Event Date: 03/15/2025
Event Time: 12:48 [CST]
Last Update Date: 03/15/2025
Notification Time: 15:32 [ET]
Event Date: 03/15/2025
Event Time: 12:48 [CST]
Last Update Date: 03/15/2025
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):
Warnick, Greg (R4DO)
Warnick, Greg (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 |
AUTOMATIC START OF THE DIVISION III EMERGENCY DIESEL GENERATOR
The following information was provided by the licensee via phone and email:
"On March 15, 2025, at 1248 CDT, Grand Gulf Nuclear Station (GGNS) was operating in mode 1 at 100 percent reactor power when a grid disturbance (degraded voltage) resulted in a valid specified system actuation (automatic start) of the division Ill emergency diesel generator (EDG). The division Ill EDG started and repowered the '17' AC safety-related electrical bus as designed.
"GGNS is currently in mode 1 at 100 percent reactor power. No radiological releases have occurred due to this event and no other safety system actuations occurred.
"This event is being reported under 10 CFR 50.72(b)(3)(iv)(A), as an event or condition that results in a valid specified system actuation due to the automatic start of the division Ill EDG on bus undervoltage due to a grid disturbance.
"The NRC Senior Resident Inspector has been notified."
The following information was provided by the licensee via phone and email:
"On March 15, 2025, at 1248 CDT, Grand Gulf Nuclear Station (GGNS) was operating in mode 1 at 100 percent reactor power when a grid disturbance (degraded voltage) resulted in a valid specified system actuation (automatic start) of the division Ill emergency diesel generator (EDG). The division Ill EDG started and repowered the '17' AC safety-related electrical bus as designed.
"GGNS is currently in mode 1 at 100 percent reactor power. No radiological releases have occurred due to this event and no other safety system actuations occurred.
"This event is being reported under 10 CFR 50.72(b)(3)(iv)(A), as an event or condition that results in a valid specified system actuation due to the automatic start of the division Ill EDG on bus undervoltage due to a grid disturbance.
"The NRC Senior Resident Inspector has been notified."