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On 9/29/2009, at 1127 hours, with the plan … On 9/29/2009, at 1127 hours, with the plant in Mode 5, Refuel, upper pool filled for refuel activities, and no fuel handling or control rod movement activities in progress, River Bend Station operators manually started Low Pressure Coolant Injection Pump Charlie to facilitate filling of the upper pool. This action was necessary to offset a loss of upper pool water through a main steam line and into the drywell. Approximately 5000 gallons of water drained from the upper pool into the drywell. Initial investigation found that the leakage was past a partially de-flated main steam line plug, through Safety Relief Valve flanges, which were not fully torqued at the time. The steam line plug became deflated during ECCS testing when service air isolated to containment. The service air system provides a backup to the mechanical seal. The drywell was evacuated and actions were initiated to close containment. The steam line plug was re-inflated which stopped leakage to the main steam line and drywell. At no time during the event was River Bend Station out of compliance with Technical Specification requirements for the upper pool. River Bend personnel are performing further investigations into the cause of the event.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
16:27:00, 29 September 2009 +
45,388 +
16:19:00, 29 September 2009 +
16:27:00, 29 September 2009 +
On 9/29/2009, at 1127 hours, with the plan … On 9/29/2009, at 1127 hours, with the plant in Mode 5, Refuel, upper pool filled for refuel activities, and no fuel handling or control rod movement activities in progress, River Bend Station operators manually started Low Pressure Coolant Injection Pump Charlie to facilitate filling of the upper pool. This action was necessary to offset a loss of upper pool water through a main steam line and into the drywell. Approximately 5000 gallons of water drained from the upper pool into the drywell. Initial investigation found that the leakage was past a partially de-flated main steam line plug, through Safety Relief Valve flanges, which were not fully torqued at the time. The steam line plug became deflated during ECCS testing when service air isolated to containment. The service air system provides a backup to the mechanical seal. The drywell was evacuated and actions were initiated to close containment. The steam line plug was re-inflated which stopped leakage to the main steam line and drywell. At no time during the event was River Bend Station out of compliance with Technical Specification requirements for the upper pool. River Bend personnel are performing further investigations into the cause of the event.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
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00:00:00, 29 September 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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16:27:00, 29 September 2009 +
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