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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 lieu of a licensee event report (LER) in accordance with 10 CFR 50.73(a)(1) for an invalid actuation of the emergency service water (ESW) system reportable under 10 CFR 50.73(a)(2)(iv)(A) at the Prairie Island Nuclear Generating Plant Units 1 and 2.</br>At 1343 CST on January 26, 2026, during post maintenance testing associated with the time delay relay replacement work for the 22 diesel driven cooling water pump (DDCLP), an ESW pump on `B' train, a jumper was installed to test an annunciator. The jumper bypassed part of the normal start circuitry and allowed a spurious start signal. As a result, the 22 DDCLP automatically started without operator command. At the time of the start, the pump was inoperable and return-to-service testing had not been completed; certain isolations, including DC control power, had been restored, which made the unintended actuation possible.</br>This event is considered an invalid system actuation of the ESW system. The actuation was not initiated in response to actual plant conditions or parameters. The 22 DDCLP started and functioned as expected in response to the start signal.</br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
19:43:00, 26 January 2026 +
58,210 +
11:00:00, 19 March 2026 +
19:43:00, 26 January 2026 +
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 lieu of a licensee event report (LER) in accordance with 10 CFR 50.73(a)(1) for an invalid actuation of the emergency service water (ESW) system reportable under 10 CFR 50.73(a)(2)(iv)(A) at the Prairie Island Nuclear Generating Plant Units 1 and 2.</br>At 1343 CST on January 26, 2026, during post maintenance testing associated with the time delay relay replacement work for the 22 diesel driven cooling water pump (DDCLP), an ESW pump on `B' train, a jumper was installed to test an annunciator. The jumper bypassed part of the normal start circuitry and allowed a spurious start signal. As a result, the 22 DDCLP automatically started without operator command. At the time of the start, the pump was inoperable and return-to-service testing had not been completed; certain isolations, including DC control power, had been restored, which made the unintended actuation possible.</br>This event is considered an invalid system actuation of the ESW system. The actuation was not initiated in response to actual plant conditions or parameters. The 22 DDCLP started and functioned as expected in response to the start signal.</br>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, 19 March 2026 +
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>.
00:43:39, 30 March 2026 +
11:00:00, 19 March 2026 +
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 +
51.678 d (1,240.28 hours, 7.383 weeks, 1.699 months) +
19:43:00, 26 January 2026 +
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.