Event Notification Report for October 26, 2025
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
10/25/2025 - 10/26/2025
EVENT NUMBERS
58007
58007
Power Reactor
Event Number: 58007
Facility: Waterford
Region: 4 State: LA
Unit: [3] [] []
RX Type: [3] CE
NRC Notified By: Jean-Luc Guilbeaux
HQ OPS Officer: Ian Howard
Region: 4 State: LA
Unit: [3] [] []
RX Type: [3] CE
NRC Notified By: Jean-Luc Guilbeaux
HQ OPS Officer: Ian Howard
Notification Date: 10/26/2025
Notification Time: 09:29 [ET]
Event Date: 10/26/2025
Event Time: 00:40 [CDT]
Last Update Date: 10/26/2025
Notification Time: 09:29 [ET]
Event Date: 10/26/2025
Event Time: 00:40 [CDT]
Last Update Date: 10/26/2025
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):
Vossmar, Patricia (R4DO)
Vossmar, Patricia (R4DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 3 | N | Y | 94 | Power Operation | 94 | Power Operation |
CONTROL ROOM ENVELOPE INOPERABLE
The following information was provided by the licensee via phone and email:
"On October 26, 2025, at 0040 CDT, the Waterford 3 Steam Electric Unit 3 operating crew declared the control room envelope inoperable in accordance with technical specification (TS) 3.7.6.1 due to the discovery of a hairline crack in the station air supply header in the passageway outside the control room.
"Operations entered TS 3.7.6.1 action b. TS 3.7.6.1 action b was complied with by closing manual valves SA-502 and SA-514, thus isolating the section of piping that developed the crack. The station air leak was isolated at time 0120. There was no impact on the health and safety of the plant or plant personnel.
"This event is reportable pursuant to 10 CFR 50.72(b)(3)(v)(D), event or condition that could have prevented fulfillment of a safety function of structures or systems that are needed to `(D) mitigate the consequences of an accident,' due to the control room envelope being inoperable."
The licensee notified the NRC Resident Inspector.
The following information was provided by the licensee via phone and email:
"On October 26, 2025, at 0040 CDT, the Waterford 3 Steam Electric Unit 3 operating crew declared the control room envelope inoperable in accordance with technical specification (TS) 3.7.6.1 due to the discovery of a hairline crack in the station air supply header in the passageway outside the control room.
"Operations entered TS 3.7.6.1 action b. TS 3.7.6.1 action b was complied with by closing manual valves SA-502 and SA-514, thus isolating the section of piping that developed the crack. The station air leak was isolated at time 0120. There was no impact on the health and safety of the plant or plant personnel.
"This event is reportable pursuant to 10 CFR 50.72(b)(3)(v)(D), event or condition that could have prevented fulfillment of a safety function of structures or systems that are needed to `(D) mitigate the consequences of an accident,' due to the control room envelope being inoperable."
The licensee notified the NRC Resident Inspector.