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This notification is being made in lieu of … This notification is being made in lieu of a written report under the reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1) to describe an invalid actuation of a Group 6 containment isolation signal affecting more than one system.</br>On April 27, 2010, at 1737 hours Central Daylight Time, with Unit 3 operating at 100 percent thermal power, Unit 3 received a Group 6 ventilation system isolation signal during the performance of a maintenance activity on a Unit 3 Reactor/Refuel Zone Radiation Monitor, 3 RM-90-141/143. This resulted in isolation of the reactor and refuel zone ventilation systems, initiation of Standby Gas Treatment system (Trains A, B, and C) and the Control Room Emergency Ventilation system (Train A).</br>All equipment responded to the Group 6 ventilation system isolation signal in accordance with the plant design. However, during the recovery effort, one of the Unit 3 Reactor Building Ventilation dampers failed to indicate fully closed. Operations personnel verified by inspection that the damper was fully closed. </br>There were no safety consequences or impact on the health and safety of the public as a result of this event. The event was entered into the Corrective Action Program (CAP) as PER 227125. </br>From PER 227125, trouble shooting determined a relay coil had been installed upside down when the coils were recently replaced. </br>The NRC Senior Resident Inspector has been notified.nior Resident Inspector has been notified. +
22:37:00, 27 April 2010 +
46,046 +
16:32:00, 25 June 2010 +
22:37:00, 27 April 2010 +
This notification is being made in lieu of … This notification is being made in lieu of a written report under the reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1) to describe an invalid actuation of a Group 6 containment isolation signal affecting more than one system.</br>On April 27, 2010, at 1737 hours Central Daylight Time, with Unit 3 operating at 100 percent thermal power, Unit 3 received a Group 6 ventilation system isolation signal during the performance of a maintenance activity on a Unit 3 Reactor/Refuel Zone Radiation Monitor, 3 RM-90-141/143. This resulted in isolation of the reactor and refuel zone ventilation systems, initiation of Standby Gas Treatment system (Trains A, B, and C) and the Control Room Emergency Ventilation system (Train A).</br>All equipment responded to the Group 6 ventilation system isolation signal in accordance with the plant design. However, during the recovery effort, one of the Unit 3 Reactor Building Ventilation dampers failed to indicate fully closed. Operations personnel verified by inspection that the damper was fully closed. </br>There were no safety consequences or impact on the health and safety of the public as a result of this event. The event was entered into the Corrective Action Program (CAP) as PER 227125. </br>From PER 227125, trouble shooting determined a relay coil had been installed upside down when the coils were recently replaced. </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, 25 June 2010 +
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>.
22:29:58, 24 September 2017 +
16:32:00, 25 June 2010 +
true +
false +
58.747 d (1,409.92 hours, 8.392 weeks, 1.931 months) +
22:37:00, 27 April 2010 +
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.