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The following information was provided by … The following information was provided by the licensee via phone and email:</br>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.</br>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.</br>The NRC Senior Resident Inspector has been notified.</br>Battery Manufacturer: Ametek Solidstate Solutions</br>Switch Manufacturer / Model: Eaton / J250K</br>The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:</br>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.re of this issue affecting any other site. +
21:53:00, 8 October 2024 +
57,370 +
17:07:00, 9 October 2024 +
21:53:00, 8 October 2024 +
The following information was provided by … The following information was provided by the licensee via phone and email:</br>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.</br>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.</br>The NRC Senior Resident Inspector has been notified.</br>Battery Manufacturer: Ametek Solidstate Solutions</br>Switch Manufacturer / Model: Eaton / J250K</br>The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:</br>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.re of this issue affecting any other site. +
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00:00:00, 9 October 2024 +
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0.801 d (19.23 hours, 0.114 weeks, 0.0263 months) +
21:53:00, 8 October 2024 +
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