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The following information was provided by … The following information was provided by the licensee via phone and email:</br>On November 2, 2025, at 0915 EST, and on November 3, 2025 at 0203 EST, while (Hatch) Unit 1 was at 100-percent power, the normal supply breaker from the `1D' 600V switchgear to the 120/208V essential transformer `1C' tripped on overcurrent due to a ground resulting in the loss of the `1B' essential bus and the `1B' instrument bus. The loss of power impacted the logic of the primary and secondary containment isolation systems resulting in the invalid actuation of containment isolation valves (CIVs) in multiple systems. The ground within the `1D' 600V switchgear was cleared by racking (out) the associated breaker and by replacing a degraded wire. A future action includes performing a detailed cubical and bus bar inspection of the `1D' 600V switchgear. </br>This event is reportable per 10 CFR 50.73(a)(2)(iv)(A) because it was not part of a pre-planned sequence and resulted in the invalid, partial actuation of CIVs in both the primary containment and secondary containment systems, with all systems responding normally. </br>There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
14:15:00, 2 November 2025 +
58,104 +
10:49:00, 31 December 2025 +
14:15:00, 2 November 2025 +
The following information was provided by … The following information was provided by the licensee via phone and email:</br>On November 2, 2025, at 0915 EST, and on November 3, 2025 at 0203 EST, while (Hatch) Unit 1 was at 100-percent power, the normal supply breaker from the `1D' 600V switchgear to the 120/208V essential transformer `1C' tripped on overcurrent due to a ground resulting in the loss of the `1B' essential bus and the `1B' instrument bus. The loss of power impacted the logic of the primary and secondary containment isolation systems resulting in the invalid actuation of containment isolation valves (CIVs) in multiple systems. The ground within the `1D' 600V switchgear was cleared by racking (out) the associated breaker and by replacing a degraded wire. A future action includes performing a detailed cubical and bus bar inspection of the `1D' 600V switchgear. </br>This event is reportable per 10 CFR 50.73(a)(2)(iv)(A) because it was not part of a pre-planned sequence and resulted in the invalid, partial actuation of CIVs in both the primary containment and secondary containment systems, with all systems responding normally. </br>There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
100 +
00:00:00, 31 December 2025 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
12:20:05, 2 January 2026 +
10:49:00, 31 December 2025 +
Processing error"Processing error" is a predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> and represents errors that appeared in connection with improper value annotations or input processing.
true +
false +
58.857 d (1,412.57 hours, 8.408 weeks, 1.935 months) +
14:15:00, 2 November 2025 +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.