Event Notification Report for October 12, 2018
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
10/11/2018 - 10/12/2018
EVENT NUMBERS
53665
Power Reactor
Event Number: 53665
Facility: SAINT LUCIE
Region: 2 State: FL
Unit: [] [2] []
RX Type: [1] CE,[2] CE
NRC Notified By: CHARLES PIKE
HQ OPS Officer: BETHANY CECERE
Region: 2 State: FL
Unit: [] [2] []
RX Type: [1] CE,[2] CE
NRC Notified By: CHARLES PIKE
HQ OPS Officer: BETHANY CECERE
Notification Date: 10/12/2018
Notification Time: 16:54 [ET]
Event Date: 10/12/2018
Event Time: 00:00 [EDT]
Last Update Date: 10/12/2018
Notification Time: 16:54 [ET]
Event Date: 10/12/2018
Event Time: 00:00 [EDT]
Last Update Date: 10/12/2018
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Person (Organization):
ANTHONY MASTERS (R2DO)
ANTHONY MASTERS (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | A/R | Y | 100 | Power Operation | 0 | Hot Standby |
AUTOMATIC REACTOR TRIP
"On October 12, 2018 at 1353 EDT, St. Lucie Unit 2 experienced an automatic RPS actuation and Reactor Trip due to a fault on the 2A1 6.9kv bus during a transfer of the bus power supply from the 2A Auxiliary Transformer to the 2A Startup Transformer. The bus fault caused a fire in the 2A1 6.9kv switchgear that has been extinguished. Offsite support was not required to extinguish the fire. The specific cause of the fault is currently under investigation.
"Following the reactor trip, both Steam Generators are being supplied by main feedwater. All [Control Element Assemblies] (CEAs) fully inserted into the core. Decay Heat removal is being accomplished through forced circulation. Main Feedwater and Steam Bypass Control Systems are maintaining stable conditions in Mode 3.
"St. Lucie Unit 1 was unaffected and remains in Mode 1 at 100 percent power.
"This report is submitted in accordance with 10 CFR 50.72(b)(2)(iv)(B) for the Reactor Trip."
The fire was extinguished within 28 minutes. Plant loads are being supplied by the 2B Auxiliary Transformer.
The licensee notified the NRC Resident Inspector.
"On October 12, 2018 at 1353 EDT, St. Lucie Unit 2 experienced an automatic RPS actuation and Reactor Trip due to a fault on the 2A1 6.9kv bus during a transfer of the bus power supply from the 2A Auxiliary Transformer to the 2A Startup Transformer. The bus fault caused a fire in the 2A1 6.9kv switchgear that has been extinguished. Offsite support was not required to extinguish the fire. The specific cause of the fault is currently under investigation.
"Following the reactor trip, both Steam Generators are being supplied by main feedwater. All [Control Element Assemblies] (CEAs) fully inserted into the core. Decay Heat removal is being accomplished through forced circulation. Main Feedwater and Steam Bypass Control Systems are maintaining stable conditions in Mode 3.
"St. Lucie Unit 1 was unaffected and remains in Mode 1 at 100 percent power.
"This report is submitted in accordance with 10 CFR 50.72(b)(2)(iv)(B) for the Reactor Trip."
The fire was extinguished within 28 minutes. Plant loads are being supplied by the 2B Auxiliary Transformer.
The licensee notified the NRC Resident Inspector.