ML26048A162
| ML26048A162 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 10/09/2024 |
| From: | Page R Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| EN 57370 | |
| Download: ML26048A162 (0) | |
Text
02-12-2026 07:03:41 U.S. Nuclear Regulatory Commission Operations Center Report 15 02-12-2026 07:03:41 U.S. Nuclear Regulatory Commission Operations Center Report Event #:
57370 Event Type:
Part 21 Reporting Org:
North Anna Power Station Notify Date/Time:
2024-10-09 17:07 (EDT)
Licensee:
North Anna Power Station Event Date/Time:
2024-10-08 17:53 (EDT)
Modify Date/Time:
2024-10-09 17:27 Region:
2 City:
Mineral Agreement State:
Yes County:
License #:
State:
VA Notified by:
Robert Page Notifications:
Suber, Gregory R2DO HOO:
Kerby Scales Part 21/50.55 Reactors, - EMAIL Emergency Class:
Non Emergency 10 CFR Sections:
21.21(d)(3)(i)
Defects And Noncompliance PART 21 - DEGRADED VOLTAGE DUE TO A LOOSE TERMINAL CONNECTION SCREW The following information was provided by the licensee via phone and email:
"This is a non-emergency notification submitted in accordance with 10 CFR 21.21(d)(3)(i). A written notification in accordance with 10 CFR 21.21(d)(3)(ii) will be provided within 20 days.
"On October 8, 2024, North Anna Power Station (NAPS) determined a manufacturing defect affecting the normal AC supply molded case switch for the Unit 1, 1-IV battery charger was reportable under Part 21. On July 29, 2024, the 1-IV battery charger was declared inoperable due to the AC input voltage reading approximately 250 VAC on the B-C phases and A-C phases. The A-B phase voltage was normal at 480 VAC. Troubleshooting determined the normal AC supply molded case switch was the cause of the degraded voltage due to a loose terminal connection screw on the 'C' phase load side of the contacts.
"The NRC Senior Resident Inspector has been notified."
Battery Manufacturer: Ametek Solidstate Solutions Switch Manufacturer / Model: Eaton / J250K The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
The licensee plans to inspect all battery chargers on both units to verify they don't have loose terminal screws. They are unaware of this issue affecting any other site.
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