Event Notification Report for March 22, 2020
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
03/21/2020 - 03/22/2020
EVENT NUMBERS
54597
Power Reactor
Event Number: 54597
Facility: BRUNSWICK
Region: 2 State: NC
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: BRIAN MOSCHET
HQ OPS Officer: OSSY FONT
Region: 2 State: NC
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: BRIAN MOSCHET
HQ OPS Officer: OSSY FONT
Notification Date: 03/22/2020
Notification Time: 16:39 [ET]
Event Date: 03/22/2020
Event Time: 12:55 [EDT]
Last Update Date: 03/22/2020
Notification Time: 16:39 [ET]
Event Date: 03/22/2020
Event Time: 12:55 [EDT]
Last Update Date: 03/22/2020
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):
MARK MILLER (R2DO)
MARK MILLER (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | M/R | Y | 2 | Startup | 0 | Hot Shutdown |
MANUAL REACTOR SCRAM
"At 1255 EDT on March 22, 2020, with Unit 1 in Mode 2, stabilized at 2 percent power, coming out of a refueling outage, all 4 main turbine Bypass Valves (BPVs) opened unexpectedly. As a result, the main control room inserted a manual reactor scram. All control rods inserted as expected during the scram.
"In accordance with plant procedures, the main control room closed all Main Steam Line Isolation Valves (MSIVs) to arrest the cooldown resulting from BPVs remaining open. The condensate system remained aligned for injection and pressure control was initially via main steam line drains. RHR [residual heat removal] shutdown cooling was placed in operation for decay heat removal and pressure control once the MSIVs were closed.
"All systems responded as designed, with the exception of the BPVs.
"Due to the Reactor Protection System actuation while critical, this event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B).
"There was no impact on the health and safety of the public or plant personnel.
"The NRC Resident Inspector has been notified."
There was no impact to Unit 2.
"At 1255 EDT on March 22, 2020, with Unit 1 in Mode 2, stabilized at 2 percent power, coming out of a refueling outage, all 4 main turbine Bypass Valves (BPVs) opened unexpectedly. As a result, the main control room inserted a manual reactor scram. All control rods inserted as expected during the scram.
"In accordance with plant procedures, the main control room closed all Main Steam Line Isolation Valves (MSIVs) to arrest the cooldown resulting from BPVs remaining open. The condensate system remained aligned for injection and pressure control was initially via main steam line drains. RHR [residual heat removal] shutdown cooling was placed in operation for decay heat removal and pressure control once the MSIVs were closed.
"All systems responded as designed, with the exception of the BPVs.
"Due to the Reactor Protection System actuation while critical, this event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B).
"There was no impact on the health and safety of the public or plant personnel.
"The NRC Resident Inspector has been notified."
There was no impact to Unit 2.