ENS 58007
ENS Event | |
|---|---|
05:40 Oct 26, 2025 | |
| Title | |
| Event Description | 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. |
| Where | |
|---|---|
Waterford  Louisiana (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+3.82 h0.159 days <br />0.0227 weeks <br />0.00523 months <br />) | |
| Opened: | Jean-Luc Guilbeaux 09:29 Oct 26, 2025 |
| NRC Officer: | Ian Howard |
| Last Updated: | Oct 26, 2025 |
| 58007 - NRC Website
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