ENS 57919
ENS Event | |
|---|---|
07:55 Sep 11, 2025 | |
| Title | Both Trains of Centrifugal Charging System Inoperable |
| Event Description | The following information was provided by the licensee via phone and email:
On September 11, 2025, Callaway was performing a planned maintenance window causing the 'B' train emergency diesel generator and the 'B' train essential service water system to be inoperable. At 0255 CDT the 'A' train centrifugal charging pump was declared inoperable due to an unexpected loss of control room indication for the 'A' train centrifugal charging pump miniflow valve. Therefore, both trains of the centrifugal charging (high head injection) system were simultaneously inoperable. This condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v)(D). A fuse was replaced on the 'A' train centrifugal charging pump miniflow valve breaker, restoring operability of that system at 0500. 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 phone and email: Event Notification57919, made on 09/11/25, pursuant to 10 CFR 50.72(b)(3)(v)(D), is being retracted based on further review of the timing of when the 'B' train essential service water (ESW) system was operable and capable of performing its support function for the 'B' train centrifugal charge pump (CCP). Further review of restoration procedures/processes determined that the 'B' train ESW system was operable by 0232 CDT on 9/11/25, which was prior to the loss of the 'A' train CCP mini-flow valve (0255 on 09/11/25). Thus, the 10 CFR 50.72(b)(3)(v)(D) reporting criterion was not met. The NRC Resident Inspector has been notified of this retraction. Notified R4DO (Agrawal) |
| Where | |
|---|---|
Callaway  Missouri (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:+3.55 h0.148 days <br />0.0211 weeks <br />0.00486 months <br />) | |
| Opened: | Daniel Mueller 11:28 Sep 11, 2025 |
| NRC Officer: | Josue Ramirez |
| Last Updated: | Sep 17, 2025 |
| 57919 - NRC Website
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