Event Notification Report for September 03, 2018
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
09/02/2018 - 09/03/2018
EVENT NUMBERS
53579
Power Reactor
Event Number: 53579
Facility: NORTH ANNA
Region: 2 State: VA
Unit: [1] [] []
RX Type: [1] W-3-LP,[2] W-3-LP,[3] M-4-LP
NRC Notified By: DAVID MOSSER
HQ OPS Officer: DONG HWA PARK
Region: 2 State: VA
Unit: [1] [] []
RX Type: [1] W-3-LP,[2] W-3-LP,[3] M-4-LP
NRC Notified By: DAVID MOSSER
HQ OPS Officer: DONG HWA PARK
Notification Date: 09/03/2018
Notification Time: 15:20 [ET]
Event Date: 09/03/2018
Event Time: 00:00 [EDT]
Last Update Date: 09/03/2018
Notification Time: 15:20 [ET]
Event Date: 09/03/2018
Event Time: 00:00 [EDT]
Last Update Date: 09/03/2018
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):
BINOY DESAI (R2DO)
BINOY DESAI (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 |
AUTOMATIC START OF THE EMERGENCY DIESEL GENERATOR
"At 1045 [EDT] on 9/3/18, with Unit 1 and Unit 2 at 100% power, off-site power feed to the 'A' Reserve Station Transformer was lost which resulted in a loss of power to Unit 1'J' Emergency Bus. As a result of the power loss, the 1'J' Emergency Diesel Generator started as designed and restored power to the Emergency Bus. During this event, the Unit 1 'A' Charging Pump, 1-CH-P-1A automatically started as designed due to the loss of power event.
"The valid actuation of these ESF [Engineered Safety Features] components due to the loss of power is reportable per 10 CFR 50.72 (b)(3)(iv)(A).
"The Unit 1 'J' Emergency bus off-site power source was restored via the Unit 2 'B' Station Service bus and the 1 'J' Emergency Diesel was secured and returned to Automatic. The Unit 1 'A' Charging pump has been stopped and returned to Automatic.
"Both Units are in a stable condition. The apparent cause for the loss of power appears to be a bird strike to the 'A' RSST [Reserve Station Service Transformer] Overhead Cable."
The licensee notified the NRC Resident Inspector.
"At 1045 [EDT] on 9/3/18, with Unit 1 and Unit 2 at 100% power, off-site power feed to the 'A' Reserve Station Transformer was lost which resulted in a loss of power to Unit 1'J' Emergency Bus. As a result of the power loss, the 1'J' Emergency Diesel Generator started as designed and restored power to the Emergency Bus. During this event, the Unit 1 'A' Charging Pump, 1-CH-P-1A automatically started as designed due to the loss of power event.
"The valid actuation of these ESF [Engineered Safety Features] components due to the loss of power is reportable per 10 CFR 50.72 (b)(3)(iv)(A).
"The Unit 1 'J' Emergency bus off-site power source was restored via the Unit 2 'B' Station Service bus and the 1 'J' Emergency Diesel was secured and returned to Automatic. The Unit 1 'A' Charging pump has been stopped and returned to Automatic.
"Both Units are in a stable condition. The apparent cause for the loss of power appears to be a bird strike to the 'A' RSST [Reserve Station Service Transformer] Overhead Cable."
The licensee notified the NRC Resident Inspector.