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This 60-day optional verbal report, as all … This 60-day optional verbal report, as allowed by 10 CFR 50.73(a)(1), is being made to describe an unplanned, invalid actuation of specified systems, specifically the Primary Containment Isolation System. Since this event meets the definition of an invalid actuation, this notification is being made in accordance with 10CFR50.73(a)(2)(iv)(A) in lieu of a Licensee Event Report.</br>On May 30, 2004, at approximately 10:40 am EDT, while the plant was operating at 100% power, a voltage regulator failed on Division 2 120 VAC Modular Power Unit No. 2 (MPU-2) which resulted in blown fuses and the loss of a number of loads from one of the three MPU-2 distribution cabinets. Since only one of the three distribution cabinets was lost, the isolations that occurred were only a portion of the isolations that would have occurred if all of the MPU-2 loads had been lost.</br>This caused containment isolations by Division 2 Drywell Pneumatic supply valves (Primary Containment Isolation Group 18) and by Torus Water Management system outboard isolation valves (Primary Containment Isolation Group 12). Division 2 Secondary Containment Isolation Logic was also actuated, and the reactor building ventilation isolated. The Division 2 Standby Gas Treatment System automatically started. All equipment controlled by the affected circuits was determined to have responded to the loss of MPU-2 Cabinet 2 power as expected.</br>Operators implemented applicable response procedures. The MPU was returned to service, and isolation signals were reset. Reactor power was not affected by this event.</br>The NRC Resident Inspector was notified of this event by the licensee.as notified of this event by the licensee. +
14:40:00, 30 May 2004 +
40,899 +
14:37:00, 27 July 2004 +
14:40:00, 30 May 2004 +
This 60-day optional verbal report, as all … This 60-day optional verbal report, as allowed by 10 CFR 50.73(a)(1), is being made to describe an unplanned, invalid actuation of specified systems, specifically the Primary Containment Isolation System. Since this event meets the definition of an invalid actuation, this notification is being made in accordance with 10CFR50.73(a)(2)(iv)(A) in lieu of a Licensee Event Report.</br>On May 30, 2004, at approximately 10:40 am EDT, while the plant was operating at 100% power, a voltage regulator failed on Division 2 120 VAC Modular Power Unit No. 2 (MPU-2) which resulted in blown fuses and the loss of a number of loads from one of the three MPU-2 distribution cabinets. Since only one of the three distribution cabinets was lost, the isolations that occurred were only a portion of the isolations that would have occurred if all of the MPU-2 loads had been lost.</br>This caused containment isolations by Division 2 Drywell Pneumatic supply valves (Primary Containment Isolation Group 18) and by Torus Water Management system outboard isolation valves (Primary Containment Isolation Group 12). Division 2 Secondary Containment Isolation Logic was also actuated, and the reactor building ventilation isolated. The Division 2 Standby Gas Treatment System automatically started. All equipment controlled by the affected circuits was determined to have responded to the loss of MPU-2 Cabinet 2 power as expected.</br>Operators implemented applicable response procedures. The MPU was returned to service, and isolation signals were reset. Reactor power was not affected by this event.</br>The NRC Resident Inspector was notified of this event by the licensee.as notified of this event by the licensee. +
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100 +
00:00:00, 27 July 2004 +
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>.
02:23:07, 2 March 2018 +
14:37:00, 27 July 2004 +
true +
false +
57.998 d (1,391.95 hours, 8.285 weeks, 1.907 months) +
14:40:00, 30 May 2004 +
Invalid Actuation of Containment Isolation Valves Due to Partial Loss of 120 Vac Modular Power Unit 2 Loads +
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