Event Notification Report for November 15, 2020
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
11/14/2020 - 11/15/2020
EVENT NUMBERS
54997
Power Reactor
Event Number: 54997
Facility: Watts Bar
Region: 2 State: TN
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Ryan Nessel
HQ OPS Officer: Dan Livermore
Region: 2 State: TN
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Ryan Nessel
HQ OPS Officer: Dan Livermore
Notification Date: 11/15/2020
Notification Time: 06:11 [ET]
Event Date: 11/15/2020
Event Time: 01:44 [EST]
Last Update Date: 11/15/2020
Notification Time: 06:11 [ET]
Event Date: 11/15/2020
Event Time: 01:44 [EST]
Last Update Date: 11/15/2020
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):
MARK MILLER (R2DO)
MARK MILLER (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
| 2 | N | N | 0 | Cold Shutdown | 0 | Cold Shutdown |
AUTOMATIC ACTUATION OF THE EMERGENCY DIESEL GENERATORS
"At 0144 EST on November 15, 2020, with Unit 1 in Mode 1 at 100 percent power and Unit 2 in Mode 5 at 0 percent power, an actuation of the Emergency Diesel Generator (EDG) system occurred while transferring the 2A-A 6.9 kV Shutdown Board (SDBD) from the maintenance feed to its normal power supply. The reason for the 2A-A 6.9 kV SDBD failing to transfer to the normal power supply is under investigation. The EDGs automatically started as designed when the valid actuation signal was received.
"This event is being reported in accordance with 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of the EDGs.
"There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."
"At 0144 EST on November 15, 2020, with Unit 1 in Mode 1 at 100 percent power and Unit 2 in Mode 5 at 0 percent power, an actuation of the Emergency Diesel Generator (EDG) system occurred while transferring the 2A-A 6.9 kV Shutdown Board (SDBD) from the maintenance feed to its normal power supply. The reason for the 2A-A 6.9 kV SDBD failing to transfer to the normal power supply is under investigation. The EDGs automatically started as designed when the valid actuation signal was received.
"This event is being reported in accordance with 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of the EDGs.
"There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."