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The following information is provided as a … The following information is provided as a sixty (60) day telephone notification to the NRC in accordance with 50.73 (a)(1) in lieu of the submittal of a written LER to report a condition that resulted in an invalid actuation of general containment isolation signals affecting containment isolation valves in more than one system and emergency service water systems that normally do not run and that serve as ultimate heat sinks. NUREG-1022, Revision 2, identifies the information that needs to be reported as discussed below.</br>On December 4, 2011, Clinton Power Station was in Mode 5 (Refueling) conducting refueling outage activities, including the installation of a self test system power supply modification. During post-maintenance activities associated with the affected power supplies, an unexpected voltage reading was identified. While investigating the anomaly, one of the two nuclear system protection system essential logic power supplies was de-energized with the redundant power supply not yet restored. At 0609 (CST), the power supply was re-energized, resulting in an inadvertent actuation of the logic.</br>Containment isolation valves on the following systems automatically closed: Instrument Air, Service Air, and Containment Floor Drain. Additionally, the Division 1 Shutdown Service Water (SX) Pump started. These actuations were not valid since the actuations were associated with low reactor water level conditions (Level 1 and Level 2) which were non-existent at the time of the event. The associated actuations were successful had the actuations been valid.</br>This event is reportable in accordance with 10CFR50.73 (a)(2)(iv)(A) and has been entered into the Corrective Action Program.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
12:09:00, 4 December 2011 +
47,587 +
11:36:00, 12 January 2012 +
12:09:00, 4 December 2011 +
The following information is provided as a … The following information is provided as a sixty (60) day telephone notification to the NRC in accordance with 50.73 (a)(1) in lieu of the submittal of a written LER to report a condition that resulted in an invalid actuation of general containment isolation signals affecting containment isolation valves in more than one system and emergency service water systems that normally do not run and that serve as ultimate heat sinks. NUREG-1022, Revision 2, identifies the information that needs to be reported as discussed below.</br>On December 4, 2011, Clinton Power Station was in Mode 5 (Refueling) conducting refueling outage activities, including the installation of a self test system power supply modification. During post-maintenance activities associated with the affected power supplies, an unexpected voltage reading was identified. While investigating the anomaly, one of the two nuclear system protection system essential logic power supplies was de-energized with the redundant power supply not yet restored. At 0609 (CST), the power supply was re-energized, resulting in an inadvertent actuation of the logic.</br>Containment isolation valves on the following systems automatically closed: Instrument Air, Service Air, and Containment Floor Drain. Additionally, the Division 1 Shutdown Service Water (SX) Pump started. These actuations were not valid since the actuations were associated with low reactor water level conditions (Level 1 and Level 2) which were non-existent at the time of the event. The associated actuations were successful had the actuations been valid.</br>This event is reportable in accordance with 10CFR50.73 (a)(2)(iv)(A) and has been entered into the Corrective Action Program.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
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, 12 January 2012 +
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>.
02:05:05, 2 March 2018 +
11:36:00, 12 January 2012 +
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38.977 d (935.45 hours, 5.568 weeks, 1.281 months) +
12:09:00, 4 December 2011 +
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.