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This telephone notification is being made … This telephone notification is being made in accordance with 10CFR50.73(a)(1) to report an invalid actuation of the Emergency Diesel Generators (EDGs) reportable under 10CFR50.73(a)(2)(iv)(A).</br>On September 21, 2007, at approximately 1310 EDT, while Operators were in the process of synchronizing the main turbine generator, a Generator Field Overexcitation trip occurred due to a failed transistor on the manual voltage regulator circuit board. This resulted in a primary and backup generator lockout and turbine trip. All four EDG's started and operated as expected. Because electrical power was never lost to the emergency buses and none of the EDGs loaded onto their respective emergency buses, the actuations were considered to be partial. The EDGs were returned to their standby line-up by 1615 on September 21, 2007. Since no actual bus undervoltage condition existed which required the EDG's to start and the start occurred inadvertently as a result of a single component failure, this event has been classified as an invalid actuation.</br>This invalid EDG start event was entered into the corrective action program (i.e., NCR 247573)</br>Initial Safety Significance Evaluation - The safety significance is considered to be minimal. The EDGs started and operated normally. Offsite electrical power to the Emergency buses was never lost. </br>Corrective Actions - The main turbine generator manual voltage regulator circuit board was replaced.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
18:10:00, 21 September 2007 +
43,791 +
10:38:00, 19 November 2007 +
18:10:00, 21 September 2007 +
This telephone notification is being made … This telephone notification is being made in accordance with 10CFR50.73(a)(1) to report an invalid actuation of the Emergency Diesel Generators (EDGs) reportable under 10CFR50.73(a)(2)(iv)(A).</br>On September 21, 2007, at approximately 1310 EDT, while Operators were in the process of synchronizing the main turbine generator, a Generator Field Overexcitation trip occurred due to a failed transistor on the manual voltage regulator circuit board. This resulted in a primary and backup generator lockout and turbine trip. All four EDG's started and operated as expected. Because electrical power was never lost to the emergency buses and none of the EDGs loaded onto their respective emergency buses, the actuations were considered to be partial. The EDGs were returned to their standby line-up by 1615 on September 21, 2007. Since no actual bus undervoltage condition existed which required the EDG's to start and the start occurred inadvertently as a result of a single component failure, this event has been classified as an invalid actuation.</br>This invalid EDG start event was entered into the corrective action program (i.e., NCR 247573)</br>Initial Safety Significance Evaluation - The safety significance is considered to be minimal. The EDGs started and operated normally. Offsite electrical power to the Emergency buses was never lost. </br>Corrective Actions - The main turbine generator manual voltage regulator circuit board was replaced.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
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23 +
00:00:00, 19 November 2007 +
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>.
02:15:34, 2 March 2018 +
10:38:00, 19 November 2007 +
true +
false +
58.645 d (1,407.47 hours, 8.378 weeks, 1.928 months) +
18:10:00, 21 September 2007 +
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.