ENS Event | |
|---|---|
04:00 Mar 7, 2025 | |
| Title | Part 21 - Circuit Breaker Defect |
| Event Description | The following information was provided by the licensee via phone and email:
On March 7, 2025, General Electric Hitachi (GEH) issued 10 CFR Part 21 Communication SC 25-01 for a molded case circuity breaker (MCCB), in accordance with 10 CFR 21.21(b). Testing performed by GEH identified a deviation in two (2) breakers; specifically, GEH part number DD148C6151P004 (Asea Brown Boveri (ABB) part number: TB13030BWE05). These MCCBs failed to instantaneously trip at the designated current and time. James A. FitzPatrick Nuclear Power Plant (JAF) completed an evaluation of this deviation in accordance with 10 CFR 21.21(a)(1) on May 6, 2025, and concluded this condition is a defect which could create a substantial safety hazard. The instantaneous trip function of this component protects safety-related buses from tripping on an overcurrent condition. JAF was listed as the only affected plant. It was determined that the defect does not exist in any installed plant equipment because bench testing performed prior to installation includes overcurrent trip testing and would have identified this defect. The components affected by this defect have been restricted to prevent them from being installed pending corrective action resolution. This letter is submitted as a non-emergency notification in accordance with 10 CFR 21.21(d)(3)(i). Additional details will be provided in a written report within 30 days, in accordance with 10 CFR 21.21(d)(3)(ii). There are no new regulatory commitments contained in this letter. The NRC Senior Resident Inspector at JAF has been notified. Should you have any questions regarding this submittal, please contact Mark Hawes, Regulatory Assurance, at (315) 349-6659. Known affected power plants: James A. FitzPatrick |
| Where | |
|---|---|
FitzPatrick  Lycoming, New York (NRC Region 1) | |
| Organization: | Fitzpatrick |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+1499.43 h62.476 days <br />8.925 weeks <br />2.054 months <br />) | |
| Opened: | Shay J. Stanistreet 14:26 May 8, 2025 |
| NRC Officer: | Ernest West |
| Last Updated: | May 8, 2025 |
| 57699 - NRC Website
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WEEKMONTHYEARENS 576992025-03-07T04:00:0007 March 2025 04:00:00
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