Browse wiki
Jump to navigation
Jump to search
At 0845 CST, on 11/29/2005 the C-337 proce … At 0845 CST, on 11/29/2005 the C-337 process building Criticality Accident Alarm System (CAAS) was being tested when a building horn control switch in C-300 Central Control Facility which supplies voltage to actuate the building CAAS evacuation horns was found to not be properly made up. This switch caused the building CAAS horns not to sound when a cluster was actuated. The test which revealed this problem, was the initial</br>'as found' test, which means the failure most likely occurred prior to today's testing. The C-337 CAAS system is a TSR system which is required to be operable in the current operating mode unless LCO actions are in place. The C-337 CAAS system was last tested on 11/05/2005 and indications are that the switch problem has existed since that time.</br>During testing the CAAS alarm was received in C-300, but the evacuation horns did not automatically sound. Per procedure if a criticality alarm had occurred the C-300 operator would have actuated the horn switch manually which would have sounded the evacuation horns. To ensure that not only the C-337 switch was properly repaired, but also to verify all other building horn control switches were in the proper state, a plant wide LCO was implemented and switch outputs were checked to verify the proper voltage output.</br>The NRC Senior Resident has been notified of this event. Resident has been notified of this event. +
14:45:00, 29 November 2005 +
42,176 +
23:36:00, 29 November 2005 +
14:45:00, 29 November 2005 +
At 0845 CST, on 11/29/2005 the C-337 proce … At 0845 CST, on 11/29/2005 the C-337 process building Criticality Accident Alarm System (CAAS) was being tested when a building horn control switch in C-300 Central Control Facility which supplies voltage to actuate the building CAAS evacuation horns was found to not be properly made up. This switch caused the building CAAS horns not to sound when a cluster was actuated. The test which revealed this problem, was the initial</br>'as found' test, which means the failure most likely occurred prior to today's testing. The C-337 CAAS system is a TSR system which is required to be operable in the current operating mode unless LCO actions are in place. The C-337 CAAS system was last tested on 11/05/2005 and indications are that the switch problem has existed since that time.</br>During testing the CAAS alarm was received in C-300, but the evacuation horns did not automatically sound. Per procedure if a criticality alarm had occurred the C-300 operator would have actuated the horn switch manually which would have sounded the evacuation horns. To ensure that not only the C-337 switch was properly repaired, but also to verify all other building horn control switches were in the proper state, a plant wide LCO was implemented and switch outputs were checked to verify the proper voltage output.</br>The NRC Senior Resident has been notified of this event. Resident has been notified of this event. +
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, 29 November 2005 +
GDP-1 +
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>.
23:36:36, 24 November 2018 +
23:36:00, 29 November 2005 +
0.369 d (8.85 hours, 0.0527 weeks, 0.0121 months) +
14:45:00, 29 November 2005 +
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.