Event Notification Report for October 23, 2022
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
10/22/2022 - 10/23/2022
Power Reactor
Event Number: 56175
Facility: Vogtle
Region: 2 State: GA
Unit: [3] [] []
RX Type: [3] W-AP1000,[4] W-AP1000
NRC Notified By: Greg Crosby
HQ OPS Officer: Ernest West
Region: 2 State: GA
Unit: [3] [] []
RX Type: [3] W-AP1000,[4] W-AP1000
NRC Notified By: Greg Crosby
HQ OPS Officer: Ernest West
Notification Date: 10/23/2022
Notification Time: 11:14 [ET]
Event Date: 10/23/2022
Event Time: 04:05 [EDT]
Last Update Date: 10/23/2022
Notification Time: 11:14 [ET]
Event Date: 10/23/2022
Event Time: 04:05 [EDT]
Last Update Date: 10/23/2022
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(3)(v)(D) - Accident Mitigation
10 CFR Section:
50.72(b)(3)(v)(D) - Accident Mitigation
Person (Organization):
Miller, Mark (R2DO)
Miller, Mark (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 3 | N | N | 0 | Refueling | 0 | Refueling |
STAGE FOUR AUTOMATIC DEPRESSURIZATION SYSTEM (ADS) INOPERABLE
The following information was provided by the licensee via email:
"At 0405 EDT on 10/23/2022, with [Vogtle] Unit 3 in Mode 6 and the reactor subcritical for greater than 28 hours, it was discovered that all three required flow paths for the stage four ADS were simultaneously inoperable; therefore, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v). The diverse actuation system was operable for manual stage four ADS during this time period.
"At 0432 EDT on 10/23/2022, two of the three required flow paths were restored to operable status, which exited the reportable condition. All required flow paths were operable at 0447 EDT.
"There was no impact on the health and safety of the public or plant personnel.
"The NRC Resident Inspector has been notified."
The following information was provided by the licensee via email:
"At 0405 EDT on 10/23/2022, with [Vogtle] Unit 3 in Mode 6 and the reactor subcritical for greater than 28 hours, it was discovered that all three required flow paths for the stage four ADS were simultaneously inoperable; therefore, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v). The diverse actuation system was operable for manual stage four ADS during this time period.
"At 0432 EDT on 10/23/2022, two of the three required flow paths were restored to operable status, which exited the reportable condition. All required flow paths were operable at 0447 EDT.
"There was no impact on the health and safety of the public or plant personnel.
"The NRC Resident Inspector has been notified."
Power Reactor
Event Number: 56176
Facility: Diablo Canyon
Region: 4 State: CA
Unit: [2] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Brian Engleton
HQ OPS Officer: Adam Koziol
Region: 4 State: CA
Unit: [2] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Brian Engleton
HQ OPS Officer: Adam Koziol
Notification Date: 10/23/2022
Notification Time: 19:05 [ET]
Event Date: 10/23/2022
Event Time: 08:30 [PDT]
Last Update Date: 10/23/2022
Notification Time: 19:05 [ET]
Event Date: 10/23/2022
Event Time: 08:30 [PDT]
Last Update Date: 10/23/2022
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(3)(ii)(A) - Degraded Condition
10 CFR Section:
50.72(b)(3)(ii)(A) - Degraded Condition
Person (Organization):
Groom, Jeremy (R4DO)
Groom, Jeremy (R4DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | N | 0 | Refueling | 0 | Refueling |
REACTOR COOLANT SYSTEM (RCS) PRESSURE BOUNDARY DEGRADATION
The following information was provided by the licensee via email:
"At 0830 PDT on 10/23/2022, during routine outage inspections on Unit 2, it was determined that the RCS Pressure Boundary did not meet ASME Section XI acceptance criteria on a 2-inch vacuum refill connection line. This event is being reported pursuant to 10 CFR 50.72(b)(3)(ii)(A).
"There was no impact on the health and safety of the public or plant personnel.
"The NRC Resident Inspector has been notified."
The following information was provided by the licensee via email:
"At 0830 PDT on 10/23/2022, during routine outage inspections on Unit 2, it was determined that the RCS Pressure Boundary did not meet ASME Section XI acceptance criteria on a 2-inch vacuum refill connection line. This event is being reported pursuant to 10 CFR 50.72(b)(3)(ii)(A).
"There was no impact on the health and safety of the public or plant personnel.
"The NRC Resident Inspector has been notified."