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On 4/11/12 at 1807 EDT, with the plant shu … On 4/11/12 at 1807 EDT, with the plant shutdown in Mode 5 during Refueling Outage 15, the 'A' Residual Heat Removal pump tripped while operating in the Shutdown Cooling Mode. The pump trip was due to an isolation of the E1150F009 'Division 1 RHR Shutdown Cooling Inboard Isolation Valve.' This resulted in an interruption of primary decay heat removal for approximately 11 minutes. Approximate calculated time to boil was 23.1 hours. This is being reported under 10CFR50.72(b)(3)(v)(B) 'Any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to remove residual heat.'</br>At the time of the pump trip, the station was attempting to restore power to Division 2 Bus 65E from the 64T cross tie bus. A voltage transient occurred due to a fault and caused a Group 4 (Shutdown Cooling/Head Spray) isolation signal. Abnormal Operating Procedure 20.205.01 'Loss of Shutdown Cooling,' was entered, the Group 4 isolation was reset and Shutdown Cooling was restored at 1818 EDT.</br>An investigation is in progress to determine the cause of the bus fault.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
22:07:00, 11 April 2012 +
47,826 +
22:38:00, 11 April 2012 +
22:07:00, 11 April 2012 +
On 4/11/12 at 1807 EDT, with the plant shu … On 4/11/12 at 1807 EDT, with the plant shutdown in Mode 5 during Refueling Outage 15, the 'A' Residual Heat Removal pump tripped while operating in the Shutdown Cooling Mode. The pump trip was due to an isolation of the E1150F009 'Division 1 RHR Shutdown Cooling Inboard Isolation Valve.' This resulted in an interruption of primary decay heat removal for approximately 11 minutes. Approximate calculated time to boil was 23.1 hours. This is being reported under 10CFR50.72(b)(3)(v)(B) 'Any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to remove residual heat.'</br>At the time of the pump trip, the station was attempting to restore power to Division 2 Bus 65E from the 64T cross tie bus. A voltage transient occurred due to a fault and caused a Group 4 (Shutdown Cooling/Head Spray) isolation signal. Abnormal Operating Procedure 20.205.01 'Loss of Shutdown Cooling,' was entered, the Group 4 isolation was reset and Shutdown Cooling was restored at 1818 EDT.</br>An investigation is in progress to determine the cause of the bus fault.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
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00:00:00, 11 April 2012 +
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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22:07:00, 11 April 2012 +
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