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At 09:11 a.m. CST on November 5, 2004, an … At 09:11 a.m. CST on November 5, 2004, an inadvertent "B" Train Loss of Site Power occurred when the normal power supply breaker to the 1G 4160V bus opened during testing. The 1B Emergency Diesel Generator started and powered up the 1G 4160V Bus as required and the Loss of Site Power Sequencer started all "B" Train LOSP Loads as required. Abnormal Operating Procedures for the LOSP and Loss of Train "A" or "B" Train RHR were completed as required for the event. The "A" Train RHR pump was manually started to provide core cooling and circulation flow as required for Mode 6. Core alterations were in progress for reload which were suspended immediately upon the event</br>Systems which did not function as required:</br>Upon the auto start signal for the 1B Motor Driven Auxiliary Feedwater Pump, the 4160V power supply breaker tripped open. The flag on the breaker indicated it was due to a time delay over current on one of the phases. Investigation into this problem is in progress.</br>Spent Fuel Pool cooling was not lost because it was being powered from "A" Train. Site power was restored to "B" Train 4160V bus at 0959 CST. An event investigation is being performed by the licensee.</br>The NRC Resident Inspector has been informed of this event by the licensee.en informed of this event by the licensee. +
15:11:00, 5 November 2004 +
14:22:00, 5 November 2004 +
15:11:00, 5 November 2004 +
At 09:11 a.m. CST on November 5, 2004, an … At 09:11 a.m. CST on November 5, 2004, an inadvertent "B" Train Loss of Site Power occurred when the normal power supply breaker to the 1G 4160V bus opened during testing. The 1B Emergency Diesel Generator started and powered up the 1G 4160V Bus as required and the Loss of Site Power Sequencer started all "B" Train LOSP Loads as required. Abnormal Operating Procedures for the LOSP and Loss of Train "A" or "B" Train RHR were completed as required for the event. The "A" Train RHR pump was manually started to provide core cooling and circulation flow as required for Mode 6. Core alterations were in progress for reload which were suspended immediately upon the event</br>Systems which did not function as required:</br>Upon the auto start signal for the 1B Motor Driven Auxiliary Feedwater Pump, the 4160V power supply breaker tripped open. The flag on the breaker indicated it was due to a time delay over current on one of the phases. Investigation into this problem is in progress.</br>Spent Fuel Pool cooling was not lost because it was being powered from "A" Train. Site power was restored to "B" Train 4160V bus at 0959 CST. An event investigation is being performed by the licensee.</br>The NRC Resident Inspector has been informed of this event by the licensee.en informed of this event by the licensee. +
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00:00:00, 5 November 2004 +
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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15:11:00, 5 November 2004 +
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