Event Notification Report for February 14, 2023
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
02/13/2023 - 02/14/2023
EVENT NUMBERS
56351
56351
Power Reactor
Event Number: 56351
Facility: Arkansas Nuclear
Region: 4 State: AR
Unit: [1] [] []
RX Type: [1] B&W-L-LP,[2] CE
NRC Notified By: Bryan Horn
HQ OPS Officer: Karen Cotton-Gross
Region: 4 State: AR
Unit: [1] [] []
RX Type: [1] B&W-L-LP,[2] CE
NRC Notified By: Bryan Horn
HQ OPS Officer: Karen Cotton-Gross
Notification Date: 02/14/2023
Notification Time: 14:40 [ET]
Event Date: 02/14/2023
Event Time: 11:03 [CST]
Last Update Date: 02/15/2023
Notification Time: 14:40 [ET]
Event Date: 02/14/2023
Event Time: 11:03 [CST]
Last Update Date: 02/15/2023
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):
Dixon, John (R4DO)
Dixon, John (R4DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | A/R | Y | 86 | Power Operation | 0 | Hot Standby |
EN Revision Imported Date: 2/15/2023
EN Revision Text: AUTOMATIC REACTOR TRIP DUE TO TWO REACTOR COOLANT PUMPS TRIPPING
The following information was provided by the licensee via email:
"On February 14, 2023 at 1103 CST, Arkansas Nuclear One, Unit 1, (ANO-1) automatically tripped on reactor protection system actuation due to two reactor coolant pumps tripping.
"ANO-1 is currently stable in MODE 3 (Hot Standby) maintaining reactor coolant system pressure and temperature with main feedwater and steaming to the condenser.
"No additional safety system actuations occurred. All immediate actions were completed satisfactorily.
"There are no indications of a radiological release on either unit as a result of this event.
"This report satisfies the reporting criteria of 10 CFR 50.72(b)(2)(iv)(B) and 10 CFR 50.72(b)(3)(iv)(A) for the reactor protection system actuation.
"The NRC Senior Resident Inspector has been notified.
"Unit 2 was not affected."
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
The licensee is investigating the cause of the two reactor coolant pump trips.
EN Revision Text: AUTOMATIC REACTOR TRIP DUE TO TWO REACTOR COOLANT PUMPS TRIPPING
The following information was provided by the licensee via email:
"On February 14, 2023 at 1103 CST, Arkansas Nuclear One, Unit 1, (ANO-1) automatically tripped on reactor protection system actuation due to two reactor coolant pumps tripping.
"ANO-1 is currently stable in MODE 3 (Hot Standby) maintaining reactor coolant system pressure and temperature with main feedwater and steaming to the condenser.
"No additional safety system actuations occurred. All immediate actions were completed satisfactorily.
"There are no indications of a radiological release on either unit as a result of this event.
"This report satisfies the reporting criteria of 10 CFR 50.72(b)(2)(iv)(B) and 10 CFR 50.72(b)(3)(iv)(A) for the reactor protection system actuation.
"The NRC Senior Resident Inspector has been notified.
"Unit 2 was not affected."
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
The licensee is investigating the cause of the two reactor coolant pump trips.