Browse wiki
Jump to navigation
Jump to search
100 +
At 0954 (PDT) on May 17, 2011, Unit 1 star … At 0954 (PDT) on May 17, 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 a startup 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. Actuation of differential relay 287X was due to maintenance activities on the safeguard relay board where differential relay 287X is installed.</br>At 1056 on May 17, 2011, the Unit 112 kV startup power system was made available to supply power to the 4 kV vital buses. All Unit 1 EDGs were shutdown and returned to their normal at-power standby configuration, and differential relay 287X (was) reset.</br>Unit 2 was unaffected by this event.</br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
16:54:00, 17 May 2011 +
46,856 +
15:42:00, 17 May 2011 +
16:54:00, 17 May 2011 +
At 0954 (PDT) on May 17, 2011, Unit 1 star … At 0954 (PDT) on May 17, 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 a startup 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. Actuation of differential relay 287X was due to maintenance activities on the safeguard relay board where differential relay 287X is installed.</br>At 1056 on May 17, 2011, the Unit 112 kV startup power system was made available to supply power to the 4 kV vital buses. All Unit 1 EDGs were shutdown and returned to their normal at-power standby configuration, and differential relay 287X (was) reset.</br>Unit 2 was unaffected by this event.</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 +
Unit 1 +, 05000275/LER-2011-004-01, 1 for Diablo, Unit 1, Regarding Emergency Diesel Generator Actuated Upon 230 Kv Isolation Due to Maintenance Activities on Relay Panel +, 05000275/LER-2011-004, For Diablo Canyon Power Unit 1, Regarding Emergency Diesel Generators Actuated Upon 230-kV Isolation Due to Maintenance Activities on Relay Panel +, For Diablo Canyon Power Unit 1 +, Regarding Emergency Diesel Generators Actuated Upon 230-kV Isolation Due to Maintenance Activities on Relay Panel +, 1 for Diablo + and Regarding Emergency Diesel Generator Actuated Upon 230 Kv Isolation Due to Maintenance Activities on Relay Panel +
00:00:00, 17 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>.
02:07:10, 2 March 2018 +
15:42:00, 17 May 2011 +
true +
false +
-0.05 d (-1.2 hours, -0.00714 weeks, -0.00164 months) +
16:54:00, 17 May 2011 +
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.