Event Notification Report for November 03, 2024
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
11/02/2024 - 11/03/2024
Power Reactor
Event Number: 57470
Facility: Brunswick
Region: 2 State: NC
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: Charles Brookshire
HQ OPS Officer: Ernest West
Region: 2 State: NC
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: Charles Brookshire
HQ OPS Officer: Ernest West
Notification Date: 12/12/2024
Notification Time: 12:22 [ET]
Event Date: 11/03/2024
Event Time: 19:17 [EST]
Last Update Date: 12/12/2024
Notification Time: 12:22 [ET]
Event Date: 11/03/2024
Event Time: 19:17 [EST]
Last Update Date: 12/12/2024
Emergency Class: Non Emergency
10 CFR Section:
50.73(a)(1) - Invalid Specif System Actuation
10 CFR Section:
50.73(a)(1) - Invalid Specif System Actuation
Person (Organization):
Franke, Mark (R2DO)
Franke, Mark (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 |
INVALID ACTUATION OF CONTAINMENT ISOLATION VALVES
The following information was provided by the licensee via phone and email:
"This 60-day optional telephone notification is being made in lieu of a licensee event report (LER) submittal as allowed by 10 CFR 50.73(a)(1). This notification is made pursuant to the reporting requirements specified in 10 CFR 50.73(a)(2)(iv)(A) for an invalid actuation of one of the systems listed in 10 CFR 50.73(a)(2)(iv)(B).
"At approximately 1917 Eastern Standard Time (EST) on November 3, 2024, an invalid actuation of group 6 primary containment isolation valves (PCIVs) (i.e., containment atmospheric control/monitoring (CAC/CAM) and post accident sampling system (PASS) isolation valves) occurred. Reactor building ventilation isolated and standby gas treatment started, per design.
"The group 6 isolation resulted from a spurious signal from the reactor building ventilation radiation monitor `A' channel. No manipulations associated with the isolation or reset logic were ongoing at the time, and no abnormalities were noted in the reactor building ventilation radiation values. The readings for both reactor building ventilation radiation monitor channels remained consistent with each other, with no readings approaching the isolation setpoint.
"The actuation was not initiated in response to actual plant conditions, it was not an intentional manual initiation, and there were no parameters satisfying the requirements for initiation of the system. Therefore, this event has been determined to be an invalid actuation.
"During this event the PCIVs functioned successfully, and the actuations were complete. This event did not result in any adverse impact to the health and safety of the public."
The following information was provided by the licensee via phone and email:
"This 60-day optional telephone notification is being made in lieu of a licensee event report (LER) submittal as allowed by 10 CFR 50.73(a)(1). This notification is made pursuant to the reporting requirements specified in 10 CFR 50.73(a)(2)(iv)(A) for an invalid actuation of one of the systems listed in 10 CFR 50.73(a)(2)(iv)(B).
"At approximately 1917 Eastern Standard Time (EST) on November 3, 2024, an invalid actuation of group 6 primary containment isolation valves (PCIVs) (i.e., containment atmospheric control/monitoring (CAC/CAM) and post accident sampling system (PASS) isolation valves) occurred. Reactor building ventilation isolated and standby gas treatment started, per design.
"The group 6 isolation resulted from a spurious signal from the reactor building ventilation radiation monitor `A' channel. No manipulations associated with the isolation or reset logic were ongoing at the time, and no abnormalities were noted in the reactor building ventilation radiation values. The readings for both reactor building ventilation radiation monitor channels remained consistent with each other, with no readings approaching the isolation setpoint.
"The actuation was not initiated in response to actual plant conditions, it was not an intentional manual initiation, and there were no parameters satisfying the requirements for initiation of the system. Therefore, this event has been determined to be an invalid actuation.
"During this event the PCIVs functioned successfully, and the actuations were complete. This event did not result in any adverse impact to the health and safety of the public."
Power Reactor
Event Number: 57411
Facility: Cook
Region: 3 State: MI
Unit: [2] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Cory Thompson
HQ OPS Officer: Natalie Starfish
Region: 3 State: MI
Unit: [2] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Cory Thompson
HQ OPS Officer: Natalie Starfish
Notification Date: 11/03/2024
Notification Time: 23:33 [ET]
Event Date: 11/03/2024
Event Time: 23:12 [EST]
Last Update Date: 11/04/2024
Notification Time: 23:33 [ET]
Event Date: 11/03/2024
Event Time: 23:12 [EST]
Last Update Date: 11/04/2024
Emergency Class: Unusual Event
10 CFR Section:
50.72(a) (1) (i) - Emergency Declared 50.72(b)(2)(xi) - Offsite Notification
10 CFR Section:
50.72(a) (1) (i) - Emergency Declared 50.72(b)(2)(xi) - Offsite Notification
Person (Organization):
Edwards, Rhex (R3DO)
Giessner, John (RA)
Veil, Andrea (NRR)
Crouch, Howard (IR)
Mitlyng, Viktoria (R3OPA)
Edwards, Rhex (R3DO)
Giessner, John (RA)
Veil, Andrea (NRR)
Crouch, Howard (IR)
Mitlyng, Viktoria (R3OPA)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
NOTIFICATION OF RAPIDLY TERMINATED UNUSUAL EVENT DUE TO FIRE ALARM IN CONTAINMENT
The following information was provided by the licensee via phone and email:
"On 11/03/2024, at 2242 EST, DC Cook Unit 2 received an annunciator indicating a fire in containment. Verification time of existence of a fire exceeded the threshold for an Unusual Event (UE), and a UE was declared at 2312 on 11/03/24. Subsequently, the alarm was determined to not be valid and the UE was exited at 2328. Berrien County and the State of Michigan were notified of the UE declaration and exit.
"The NRC Resident Inspector has been notified."
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
No actual fire existed. The emergency action level for this event is HU4.2.
Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), CWMD Watch Desk (email), DHS NRCC THD Desk (email), and DHS Nuclear SSA (email).
The following information was provided by the licensee via phone and email:
"On 11/03/2024, at 2242 EST, DC Cook Unit 2 received an annunciator indicating a fire in containment. Verification time of existence of a fire exceeded the threshold for an Unusual Event (UE), and a UE was declared at 2312 on 11/03/24. Subsequently, the alarm was determined to not be valid and the UE was exited at 2328. Berrien County and the State of Michigan were notified of the UE declaration and exit.
"The NRC Resident Inspector has been notified."
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
No actual fire existed. The emergency action level for this event is HU4.2.
Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), CWMD Watch Desk (email), DHS NRCC THD Desk (email), and DHS Nuclear SSA (email).