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The following information was provided by … The following information was provided by the licensee via phone and email:</br>At 1847 EDT on 3/13/25, with Unit 4 in mode 6 and defueled, an actuation of the 4B emergency diesel generator (EDG) occurred when the Unit 4 startup transformer '4B' 4kV Bus Supply Breaker '4AB05' tripped open. The '4B' EDG automatically started and energized the '4B' 4kV Bus as designed when the undervoltage condition caused the '4B' sequencer loss of offsite power signal to be received.</br>This event is being reported pursuant to 10 CFR 50.72(b)(3)(iv)(A). </br>The NRC Resident Inspector has been notified.</br>The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:</br>All systems responded as expected for the loss of voltage. There was no impact to the health and safety of the public or plant personnel. The cause of the breaker opening is under investigation. Power remains available to the '4B' 4kV Bus via both the '4B' EDG and the station blackout tie bus.'4B' EDG and the station blackout tie bus. +
22:47:00, 13 March 2025 +
57,604 +
00:18:00, 14 March 2025 +
22:47:00, 13 March 2025 +
The following information was provided by … The following information was provided by the licensee via phone and email:</br>At 1847 EDT on 3/13/25, with Unit 4 in mode 6 and defueled, an actuation of the 4B emergency diesel generator (EDG) occurred when the Unit 4 startup transformer '4B' 4kV Bus Supply Breaker '4AB05' tripped open. The '4B' EDG automatically started and energized the '4B' 4kV Bus as designed when the undervoltage condition caused the '4B' sequencer loss of offsite power signal to be received.</br>This event is being reported pursuant to 10 CFR 50.72(b)(3)(iv)(A). </br>The NRC Resident Inspector has been notified.</br>The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:</br>All systems responded as expected for the loss of voltage. There was no impact to the health and safety of the public or plant personnel. The cause of the breaker opening is under investigation. Power remains available to the '4B' 4kV Bus via both the '4B' EDG and the station blackout tie bus.'4B' EDG and the station blackout tie bus. +
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>.
00:00:00, 14 March 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>.
11:20:21, 17 March 2025 +
00:18:00, 14 March 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.
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0.0633 d (1.52 hours, 0.00905 weeks, 0.00208 months) +
22:47:00, 13 March 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.