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The following information was provided by … The following information was provided by the licensee:</br>On December 13, 2004, at 1615 hours, during clearance restoration activities following 24V DC battery maintenance, Battery 22B-1 output breaker located on 24/48V DC Distribution Panel 22B, Circuit 5 was inadvertently opened resulting in the invalid actuation of the Unit 1 logic associated with the 24V DC bus. The actuations included the Primary Containment Isolation System (PCIS) Group 6 (i.e., Containment Atmosphere Control/Dilution, Containment Atmosphere Monitoring, and Post Accident Sampling Systems) valves, the Reactor Building Ventilation System Isolation (i.e., Secondary Containment isolation), and the automatic start of both Standby Gas Treatment (SGT) System trains A and B. The actuations of PCIS Group 6 valves and Reactor Building Ventilation System Isolation were complete and the affected equipment responded as designed to the invalid signal (i.e., the valves and dampers that were open, at the time of the event, closed). Additionally, SGT System trains A and B started and functioned successfully. After verification of the expected equipment responses, the breaker was reset, the actuation logic was reset, and the equipment/systems were returned to the status required by plant conditions.</br>Discussion of the causes and corrective actions associated with this event are documented in the corrective action program in action request 145898. The (NRC) resident inspector has been notified.NRC) resident inspector has been notified. +
21:15:00, 13 December 2004 +
09:20:00, 26 January 2005 +
21:15:00, 13 December 2004 +
The following information was provided by … The following information was provided by the licensee:</br>On December 13, 2004, at 1615 hours, during clearance restoration activities following 24V DC battery maintenance, Battery 22B-1 output breaker located on 24/48V DC Distribution Panel 22B, Circuit 5 was inadvertently opened resulting in the invalid actuation of the Unit 1 logic associated with the 24V DC bus. The actuations included the Primary Containment Isolation System (PCIS) Group 6 (i.e., Containment Atmosphere Control/Dilution, Containment Atmosphere Monitoring, and Post Accident Sampling Systems) valves, the Reactor Building Ventilation System Isolation (i.e., Secondary Containment isolation), and the automatic start of both Standby Gas Treatment (SGT) System trains A and B. The actuations of PCIS Group 6 valves and Reactor Building Ventilation System Isolation were complete and the affected equipment responded as designed to the invalid signal (i.e., the valves and dampers that were open, at the time of the event, closed). Additionally, SGT System trains A and B started and functioned successfully. After verification of the expected equipment responses, the breaker was reset, the actuation logic was reset, and the equipment/systems were returned to the status required by plant conditions.</br>Discussion of the causes and corrective actions associated with this event are documented in the corrective action program in action request 145898. 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, 26 January 2005 +
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>.
22:41:45, 24 September 2017 +
09:20:00, 26 January 2005 +
true +
false +
43.503 d (1,044.08 hours, 6.215 weeks, 1.43 months) +
21:15:00, 13 December 2004 +
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.