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A valid Engineering Safety Feature (ESF) a … A valid Engineering Safety Feature (ESF) actuation for emergency A/C power for the 15AA bus occurred at 2327 on 5/5/09 due to degraded voltage on ESF Transformer 12. ESF Transformer 12 was supplying power to the 15M bus due to Service Transformer 21 being out of service for maintenance. A fault occurred on the site power loop at switch 389-2901S causing breaker J3872 and breaker 5X01 to open de-energizing the site power loop and degrading the offsite power circuit 115kv voltage to the point that Division 1 Load Shedding and Sequencing (LSS) sensed a degraded voltage condition and performed a Load Shedding and Sequencing on the 15AA bus and started Division 1 Emergency Diesel Generator to power the 15AA bus. Division 1 Diesel Generator is now supplying power to the 15M bus. Operators implemented appropriate off normal event procedures to mitigate the transient. All systems responded as designed.</br>The exact cause of the fault to switch 2109S is not known at this time.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
04:27:00, 6 May 2009 +
45,044 +
06:22:00, 6 May 2009 +
04:27:00, 6 May 2009 +
A valid Engineering Safety Feature (ESF) a … A valid Engineering Safety Feature (ESF) actuation for emergency A/C power for the 15AA bus occurred at 2327 on 5/5/09 due to degraded voltage on ESF Transformer 12. ESF Transformer 12 was supplying power to the 15M bus due to Service Transformer 21 being out of service for maintenance. A fault occurred on the site power loop at switch 389-2901S causing breaker J3872 and breaker 5X01 to open de-energizing the site power loop and degrading the offsite power circuit 115kv voltage to the point that Division 1 Load Shedding and Sequencing (LSS) sensed a degraded voltage condition and performed a Load Shedding and Sequencing on the 15AA bus and started Division 1 Emergency Diesel Generator to power the 15AA bus. Division 1 Diesel Generator is now supplying power to the 15M bus. Operators implemented appropriate off normal event procedures to mitigate the transient. All systems responded as designed.</br>The exact cause of the fault to switch 2109S is not known at this time.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
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, 6 May 2009 +
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>.
02:12:09, 2 March 2018 +
06:22:00, 6 May 2009 +
true +
false +
0.08 d (1.92 hours, 0.0114 weeks, 0.00263 months) +
04:27:00, 6 May 2009 +
Valid Auto-Start and Loading of Emergency Diesel Generator to Safety Bus Due to Undervoltage Condition +
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