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100 +
This 60-day telephone notification is bein … This 60-day telephone notification is being made under reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) to describe an invalid actuation of general containment isolation signals affecting more than one system.</br>On September 28, 2004, with Unit 2 operating at 100% thermal power, at 1302 hours CDT during maintenance work associated with protective relaying on 480 VAC Shutdown Board 2A, the board was inadvertently tripped. Associated RPS motor-generator (MG) set 2A lost power, and RPS bus 2A, which is powered from this MG set, was de-energized. Primary Containment Isolation System (PCIS) logic circuits powered from this bus lost power, and PCIS logic Groups 2, 3, 6, and 8 were actuated.</br>The following actuations/isolations occurred:</br>Group 2: Isolation of the Pressure Suppression Chamber head tank pumps (and) Drywell Floor and Equipment Drains</br>Group 3: Isolation of the reactor water cleanup system.</br>Group 6: Initiation of the Standby Gas Treatment System (and) Initiation of Control Room Emergency Ventilation (and) Isolation of the reactor zone and refuel zone normal ventilation system.</br>Group 8: This logic isolates the Traversing Incore Probes (TIP) if they are inserted. The TIPs were not inserted at the time of this event.</br>All equipment responded in accordance with the plant design.</br>There were no safety consequences or impacts on the health and safety of the public. The event was entered into TVA's corrective action program for resolution.</br>The NRC senior resident inspector has been notified.nior resident inspector has been notified. +
18:02:00, 28 September 2004 +
11:05:00, 8 November 2004 +
18:02:00, 28 September 2004 +
This 60-day telephone notification is bein … This 60-day telephone notification is being made under reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) to describe an invalid actuation of general containment isolation signals affecting more than one system.</br>On September 28, 2004, with Unit 2 operating at 100% thermal power, at 1302 hours CDT during maintenance work associated with protective relaying on 480 VAC Shutdown Board 2A, the board was inadvertently tripped. Associated RPS motor-generator (MG) set 2A lost power, and RPS bus 2A, which is powered from this MG set, was de-energized. Primary Containment Isolation System (PCIS) logic circuits powered from this bus lost power, and PCIS logic Groups 2, 3, 6, and 8 were actuated.</br>The following actuations/isolations occurred:</br>Group 2: Isolation of the Pressure Suppression Chamber head tank pumps (and) Drywell Floor and Equipment Drains</br>Group 3: Isolation of the reactor water cleanup system.</br>Group 6: Initiation of the Standby Gas Treatment System (and) Initiation of Control Room Emergency Ventilation (and) Isolation of the reactor zone and refuel zone normal ventilation system.</br>Group 8: This logic isolates the Traversing Incore Probes (TIP) if they are inserted. The TIPs were not inserted at the time of this event.</br>All equipment responded in accordance with the plant design.</br>There were no safety consequences or impacts on the health and safety of the public. The event was entered into TVA's corrective action program for resolution.</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, 8 November 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>.
02:22:22, 2 March 2018 +
11:05:00, 8 November 2004 +
true +
false +
40.669 d (976.05 hours, 5.81 weeks, 1.337 months) +
18:02:00, 28 September 2004 +
Invalid Primary Containment Isolation System Actuation from Loss-Of-Power to Reactor Protection System (Rps) Bus 2A +
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.