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While performing a main condenser flow rev … While performing a main condenser flow reversal at 0358 (CDT) on August 12, 2010 the Unit 1 reactor received an automatic scram on turbine stop valve closure. Turbine stop valve closure was initiated from a turbine trip on low vacuum. Reactor water level decreased to approximately -3 (inches), which resulted in automatic Group II and III isolations as expected. All systems responded properly to the event. Unit One remains in Mode 3, maintaining reactor pressure with reactor water level in the normal level band. The cause of the event is still under investigation.</br>Unit 2 was unaffected by the event and remains at 100% power.</br>This report is being made in accordance with 10CFR50.72(b)(2)(iv)(B) and 10CFR50.72(b)(3)(iv)(A).</br>All rods fully inserted. Normal feedwater is supplying the reactor with decay heat removal via the turbine bypass valves. No safety relief valves lifted during the transient. The transient was initiated during the condenser flow reversal when one of the flow reversal valves failed to fully reverse the flow. This resulted in inadequate heat transfer to circ water at full power operation causing the condenser vacuum to increase. In addition, the condenser vacuum trip of the turbine appears to have initiated before it was actually required. Overall, the scram was characterized as uncomplicated and all systems functioned as required.ed and all systems functioned as required. +
08:58:00, 12 August 2010 +
46,169 +
08:04:00, 12 August 2010 +
08:58:00, 12 August 2010 +
While performing a main condenser flow rev … While performing a main condenser flow reversal at 0358 (CDT) on August 12, 2010 the Unit 1 reactor received an automatic scram on turbine stop valve closure. Turbine stop valve closure was initiated from a turbine trip on low vacuum. Reactor water level decreased to approximately -3 (inches), which resulted in automatic Group II and III isolations as expected. All systems responded properly to the event. Unit One remains in Mode 3, maintaining reactor pressure with reactor water level in the normal level band. The cause of the event is still under investigation.</br>Unit 2 was unaffected by the event and remains at 100% power.</br>This report is being made in accordance with 10CFR50.72(b)(2)(iv)(B) and 10CFR50.72(b)(3)(iv)(A).</br>All rods fully inserted. Normal feedwater is supplying the reactor with decay heat removal via the turbine bypass valves. No safety relief valves lifted during the transient. The transient was initiated during the condenser flow reversal when one of the flow reversal valves failed to fully reverse the flow. This resulted in inadequate heat transfer to circ water at full power operation causing the condenser vacuum to increase. In addition, the condenser vacuum trip of the turbine appears to have initiated before it was actually required. Overall, the scram was characterized as uncomplicated and all systems functioned as required.ed and all systems functioned as required. +
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