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The following information was provided by … The following information was provided by the licensee via phone and email:</br>This 60-day telephone notification is being made in accordance with 10 CFR 50.73(a)(1) and 10 CFR 50.73(a)(2)(iv)(A).</br>On August 8, 2023, at 1107 hours pacific daylight time (PDT) with Unit 1 in Mode 1 at 100 percent power, an invalid actuation occurred when Unit 1 4-kV vital bus 'G' was automatically transferred from auxiliary power to startup power due to an invalid bus under voltage signal, which occurred during planned maintenance activities. </br>As a result of the actuation signal, auxiliary salt water and containment fan cooling units transferred automatically and started as designed. Plant systems responded as expected. This event was entered into the Diablo Canyon Power Plant corrective action program for resolution. </br>There was no plant or public safety impact. </br>The NRC Senior Resident Inspector has been notified.nior Resident Inspector has been notified. +
18:07:00, 8 August 2023 +
18:12:00, 6 October 2023 +
18:07:00, 8 August 2023 +
The following information was provided by … The following information was provided by the licensee via phone and email:</br>This 60-day telephone notification is being made in accordance with 10 CFR 50.73(a)(1) and 10 CFR 50.73(a)(2)(iv)(A).</br>On August 8, 2023, at 1107 hours pacific daylight time (PDT) with Unit 1 in Mode 1 at 100 percent power, an invalid actuation occurred when Unit 1 4-kV vital bus 'G' was automatically transferred from auxiliary power to startup power due to an invalid bus under voltage signal, which occurred during planned maintenance activities. </br>As a result of the actuation signal, auxiliary salt water and containment fan cooling units transferred automatically and started as designed. Plant systems responded as expected. This event was entered into the Diablo Canyon Power Plant corrective action program for resolution. </br>There was no plant or public safety impact. </br>The NRC Senior Resident Inspector has been notified.nior 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, 6 October 2023 +
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>.
11:30:45, 10 October 2023 +
18:12:00, 6 October 2023 +
true +
false +
59.003 d (1,416.08 hours, 8.429 weeks, 1.94 months) +
18:07:00, 8 August 2023 +
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.