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A valid actuation of the D23 Emergency Die … A valid actuation of the D23 Emergency Diesel Generator bus undervoltage minimum actuation logic occurred following manual operator action to mitigate a bus overvoltage condition during emergency diesel generator post maintenance testing . Due to the output breaker being opened, the D23 EDG experienced a undervoltage start signal. EDG undervoltage actuation instrumentation actuated, however, the EDG was in PTL (Pull-to-Lock) EDG shutdown. The event was caused by a failure of the emergency diesel generator voltage regulator most likely due to an intermittent failure of the #1 rectifier bank.</br>The licensee stated that the D23 EDG was powering an isolated safety related bus for a post-maintenance test when the overvoltage condition occurred. The operator opened the EDG output breaker and placed the EDG in PTL. With the bus de-energized, a valid start signal was sent to EDG D23. However, EDG D23 did not actually start because it was in PTL. No safety related equipment was lost when the bus was de-energized because the bus had been unloaded prior to the test.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
22:50:00, 31 March 2009 +
44,948 +
00:10:00, 1 April 2009 +
22:50:00, 31 March 2009 +
A valid actuation of the D23 Emergency Die … A valid actuation of the D23 Emergency Diesel Generator bus undervoltage minimum actuation logic occurred following manual operator action to mitigate a bus overvoltage condition during emergency diesel generator post maintenance testing . Due to the output breaker being opened, the D23 EDG experienced a undervoltage start signal. EDG undervoltage actuation instrumentation actuated, however, the EDG was in PTL (Pull-to-Lock) EDG shutdown. The event was caused by a failure of the emergency diesel generator voltage regulator most likely due to an intermittent failure of the #1 rectifier bank.</br>The licensee stated that the D23 EDG was powering an isolated safety related bus for a post-maintenance test when the overvoltage condition occurred. The operator opened the EDG output breaker and placed the EDG in PTL. With the bus de-energized, a valid start signal was sent to EDG D23. However, EDG D23 did not actually start because it was in PTL. No safety related equipment was lost when the bus was de-energized because the bus had been unloaded prior to the test.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
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00:00:00, 1 April 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>.
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00:10:00, 1 April 2009 +
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0.0554 d (1.33 hours, 0.00792 weeks, 0.00182 months) +
22:50:00, 31 March 2009 +
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.