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At 0226 PDT on May 26, 2011, Unit 1 startu … At 0226 PDT on May 26, 2011, Unit 1 startup power was lost following actuation of the 230 KV line pilot wire differential relay 287X. Loss of power to the Unit 1 12 KV startup bus produced an undervoltage signal that caused all Unit 1 emergency diesel generators (EDGs) to start in a standby mode. The EDGs started as designed with no problems observed. No vital loads were affected as a result of the 12 KV bus loss and subsequent undervoltage. The cause of actuation of the differential relay 287X is under investigation at this time.</br> </br>At 0255 PDT on May 26, 2011, all Unit 1 EDGs were shutdown and returned to their normal at-power standby configuration. </br>Unit 2 startup power was cleared at this time and there was no effect on Unit 2.</br> </br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
09:26:00, 26 May 2011 +
46,894 +
12:57:00, 26 May 2011 +
09:26:00, 26 May 2011 +
At 0226 PDT on May 26, 2011, Unit 1 startu … At 0226 PDT on May 26, 2011, Unit 1 startup power was lost following actuation of the 230 KV line pilot wire differential relay 287X. Loss of power to the Unit 1 12 KV startup bus produced an undervoltage signal that caused all Unit 1 emergency diesel generators (EDGs) to start in a standby mode. The EDGs started as designed with no problems observed. No vital loads were affected as a result of the 12 KV bus loss and subsequent undervoltage. The cause of actuation of the differential relay 287X is under investigation at this time.</br> </br>At 0255 PDT on May 26, 2011, all Unit 1 EDGs were shutdown and returned to their normal at-power standby configuration. </br>Unit 2 startup power was cleared at this time and there was no effect on Unit 2.</br> </br>The NRC Resident Inspector has been notified. NRC 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 +
05000275/LER-2011-005-01, 1 for Diablo Canyon Unit 1, Emergency Diesel Generator Actuations Upon Loss of 230 Kv Startup Due to Electrical Maintenance Testing Activities +, 05000275/LER-2011-005, For Diablo Canyon Power Plant, Unit 1 - Emergency Diesel Generator Actuations Upon Loss of 230 Kv Startup Due to Electric Maintenance Testing Activities +, For Diablo Canyon Power Plant +, Unit 1 - Emergency Diesel Generator Actuations Upon Loss of 230 Kv Startup Due to Electric Maintenance Testing Activities +, 1 for Diablo Canyon Unit 1 + and Emergency Diesel Generator Actuations Upon Loss of 230 Kv Startup Due to Electrical Maintenance Testing Activities +
00:00:00, 26 May 2011 +
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>.
02:07:04, 2 March 2018 +
12:57:00, 26 May 2011 +
true +
false +
0.147 d (3.52 hours, 0.021 weeks, 0.00482 months) +
09:26:00, 26 May 2011 +
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