Event Notification Report for September 26, 2017
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
09/25/2017 - 09/26/2017
EVENT NUMBERS
52992
Power Reactor
Event Number: 52992
Facility: VOGTLE
Region: 2 State: GA
Unit: [] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: KEVIN LOWE
HQ OPS Officer: HOWIE CROUCH
Region: 2 State: GA
Unit: [] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: KEVIN LOWE
HQ OPS Officer: HOWIE CROUCH
Notification Date: 09/26/2017
Notification Time: 11:03 [ET]
Event Date: 09/26/2017
Event Time: 05:43 [EDT]
Last Update Date: 09/26/2017
Notification Time: 11:03 [ET]
Event Date: 09/26/2017
Event Time: 05:43 [EDT]
Last Update Date: 09/26/2017
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 (R2DO)
RANDY MUSSER (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | N | 0 | Refueling | 0 | Refueling |
AUTOMATIC START OF THE 2B EMERGENCY DIESEL DUE TO A VALID UNDERVOLTAGE SIGNAL
"At approximately 0543 [EDT], while [recovering from the performance of] 2B Emergency Diesel Generator and ESFAS testing, a [subsequent] valid undervoltage actuation signal was sent to the 2B Emergency Diesel Generator (EDG). The 2B AC emergency bus (2BA03) was load shed, the 2B EDG automatically started, and tied to 2BA03. The 2BA03 bus was loaded by the automatic load sequencer. The actuation was identified by the Control Room operators and the 2B EDG was locally monitored while in service.
"This actuation is reportable due to the automatic actuation of a system listed in 10 CFR 50.72(b)(3)(iv)(B).
"The reactor was not critical at the time of the event and not challenged throughout the event.
"Decay heat removal and spent fuel pool cooling were not challenged throughout the event.
"The NRC Resident Inspector has been notified."
The cause of the undervoltage condition is under investigation.
"At approximately 0543 [EDT], while [recovering from the performance of] 2B Emergency Diesel Generator and ESFAS testing, a [subsequent] valid undervoltage actuation signal was sent to the 2B Emergency Diesel Generator (EDG). The 2B AC emergency bus (2BA03) was load shed, the 2B EDG automatically started, and tied to 2BA03. The 2BA03 bus was loaded by the automatic load sequencer. The actuation was identified by the Control Room operators and the 2B EDG was locally monitored while in service.
"This actuation is reportable due to the automatic actuation of a system listed in 10 CFR 50.72(b)(3)(iv)(B).
"The reactor was not critical at the time of the event and not challenged throughout the event.
"Decay heat removal and spent fuel pool cooling were not challenged throughout the event.
"The NRC Resident Inspector has been notified."
The cause of the undervoltage condition is under investigation.