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During the plant response to the trip of t … During the plant response to the trip of the B Recirculating water pump, reactor water level rose to the HPCI (High Pressure Core Injection) high water level trip setpoint as indicated on the associated instrumentation. With this high water level trip actuated, the HPCI high drywell pressure initiation signal would not have allowed the HPCI system to perform its intended safety function if required. If the HPCI system received the low water level initiation signal, the system would have been able to perform Its intended safety function. This high water level signal was actuated from 1935 (EDT) until reset at 1940 (EDT). This is reportable under 50.72(b)(3)(v).</br>The licensee notified NRC Resident Inspector.</br>* * * RETRACTION PROVIDED BY DAVID CALLAN TO JEFFREY HERRERA AT 1404 EDT ON 12/08/14 * * *</br>Further review has determined that the condition was not a result of procedural errors/inadequacies, equipment failures, or design / analysis inadequacies. Plant systems responded as per design when the HPCI system high water level trip actuated when reactor vessel water level rose to the HPCI high water level trip setpoint. HPCI initiation has two logics: one for low-low vessel water level and the other for a high drywell pressure. A vessel low-low water level is an indication that reactor coolant is being lost with a need for HPCI injection for core cooling. High drywell pressure could indicate a line break in the Reactor Coolant Pressure Boundary inside the drywell. The HPCI level instrumentation is designed to shut down the HPCI system upon high water level to prevent HPCI turbine damage due to gross moisture carryover and will re-initiate HPCI if vessel water level drops to the initiation water level setpoint. A HPCI high drywell pressure initiation signal, above setpoint, would have made up the logic for HPCI initiation and as per design, HPCI would have injected at the vessel low low level setpoint without operator action to reset the trip. In this instance, the trip was reset as prescribed by station procedures. HPCI was capable of performing its safety function after the high water level trip reset either by operator action or instrumentation (low low level initiation).</br>The licensee will be notifying the NRC Resident Inspector.</br>Notified R1DO (Rogge).Resident Inspector.
Notified R1DO (Rogge).
23:35:00, 13 October 2014 +
01:30:00, 14 October 2014 +
23:35:00, 13 October 2014 +
During the plant response to the trip of t … During the plant response to the trip of the B Recirculating water pump, reactor water level rose to the HPCI (High Pressure Core Injection) high water level trip setpoint as indicated on the associated instrumentation. With this high water level trip actuated, the HPCI high drywell pressure initiation signal would not have allowed the HPCI system to perform its intended safety function if required. If the HPCI system received the low water level initiation signal, the system would have been able to perform Its intended safety function. This high water level signal was actuated from 1935 (EDT) until reset at 1940 (EDT). This is reportable under 50.72(b)(3)(v).</br>The licensee notified NRC Resident Inspector.</br>* * * RETRACTION PROVIDED BY DAVID CALLAN TO JEFFREY HERRERA AT 1404 EDT ON 12/08/14 * * *</br>Further review has determined that the condition was not a result of procedural errors/inadequacies, equipment failures, or design / analysis inadequacies. Plant systems responded as per design when the HPCI system high water level trip actuated when reactor vessel water level rose to the HPCI high water level trip setpoint. HPCI initiation has two logics: one for low-low vessel water level and the other for a high drywell pressure. A vessel low-low water level is an indication that reactor coolant is being lost with a need for HPCI injection for core cooling. High drywell pressure could indicate a line break in the Reactor Coolant Pressure Boundary inside the drywell. The HPCI level instrumentation is designed to shut down the HPCI system upon high water level to prevent HPCI turbine damage due to gross moisture carryover and will re-initiate HPCI if vessel water level drops to the initiation water level setpoint. A HPCI high drywell pressure initiation signal, above setpoint, would have made up the logic for HPCI initiation and as per design, HPCI would have injected at the vessel low low level setpoint without operator action to reset the trip. In this instance, the trip was reset as prescribed by station procedures. HPCI was capable of performing its safety function after the high water level trip reset either by operator action or instrumentation (low low level initiation).</br>The licensee will be notifying the NRC Resident Inspector.</br>Notified R1DO (Rogge).Resident Inspector.
Notified R1DO (Rogge).
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00:00:00, 8 December 2014 +
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>.
22:18:44, 24 September 2017 +
01:30:00, 14 October 2014 +
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0.08 d (1.92 hours, 0.0114 weeks, 0.00263 months) +
23:35:00, 13 October 2014 +
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