ENS Event | |
|---|---|
04:58 May 23, 2025 | |
| Title | Degraded RHR Check Valve |
| Event Description | The following information was provided by the licensee via phone and email:
On May 22, 2025, at 2358 CDT, River Bend Station determined that a degraded condition existed following the performance of a VT-3 examination of E12-AOVF041A, Residual Heat Removal (RHR) 'A' injection line testable check valve. The cause of this event is currently being investigated. This examination was conducted following the plant shutdown, which was reported in Event Notification57725. This event is being reported as an 8-hour reportable condition in accordance with 10 CFR 50.72(b)(3)(ii)(A) for the degraded condition of the pressure boundary. The NRC Resident Inspector has been notified." The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance: This degraded condition resulted in a leakage rate of approximately 3.6 gallons per minute when at pressure. The plant is shutdown and depressurized which has caused the leakage to stop. No release is occurring or expected and possible corrective actions are being evaluated. |
| Where | |
|---|---|
River Bend  Louisiana (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded | |
| LER: | 05000458/LER-2025-002-01 For River Bend Station Unit 1 Unidentified Drywell Leakage Increase Results in Shutdown |
| Time - Person (Reporting Time:+-2.62 h-0.109 days <br />-0.0156 weeks <br />-0.00359 months <br />) | |
| Opened: | Darren Farthing 02:21 May 23, 2025 |
| NRC Officer: | Jordan Wingate |
| Last Updated: | May 23, 2025 |
| 57731 - NRC Website
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WEEKMONTHYEARENS 577312025-05-23T04:58:00023 May 2025 04:58:00
[Table view]10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Degraded RHR Check Valve ENS 540312019-04-26T16:47:00026 April 2019 16:47:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Through Wall Leak on Standby Liquid Control System Piping 2025-05-23T04:58:00 | |