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At approximately 0452 on 03/26/09, Sequoya … At approximately 0452 on 03/26/09, Sequoyah Unit 2 received an Automatic Reactor trip on Reactor Coolant Pump Busses Undervoltage. A loss of Common Service Station Transformer C caused a loss of power to the 2B and 2D Unit Boards. The 2B and 2D unit boards are the 6.9Kv electrical feeds to the 2-2 and 2-4 RCPs, respectively. RCPs 2-1 and 2-3 are running.</br>ESF functions initiated as designed including Aux Feed Water auto-start, automatic Feedwater isolation, and auto-start of all four EDGs. The 2A Shutdown Board is being powered from the 2A EDG.</br>The plant is currently being maintained in Mode 3 at approximately 547 degrees F /2235 PSIG. Decay heat is being removed by the auxiliary feedwater system and Steam Generator Atmospheric Relief valves.</br>The cause of the loss of Common Service Station Transformer C is not known at this time and investigation is ongoing.</br>All rods inserted as expected. No safety related equipment is out of service. Unit 2 has no known Steam Generator Tube leaks.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
08:52:00, 26 March 2009 +
44,935 +
08:29:00, 26 March 2009 +
08:52:00, 26 March 2009 +
At approximately 0452 on 03/26/09, Sequoya … At approximately 0452 on 03/26/09, Sequoyah Unit 2 received an Automatic Reactor trip on Reactor Coolant Pump Busses Undervoltage. A loss of Common Service Station Transformer C caused a loss of power to the 2B and 2D Unit Boards. The 2B and 2D unit boards are the 6.9Kv electrical feeds to the 2-2 and 2-4 RCPs, respectively. RCPs 2-1 and 2-3 are running.</br>ESF functions initiated as designed including Aux Feed Water auto-start, automatic Feedwater isolation, and auto-start of all four EDGs. The 2A Shutdown Board is being powered from the 2A EDG.</br>The plant is currently being maintained in Mode 3 at approximately 547 degrees F /2235 PSIG. Decay heat is being removed by the auxiliary feedwater system and Steam Generator Atmospheric Relief valves.</br>The cause of the loss of Common Service Station Transformer C is not known at this time and investigation is ongoing.</br>All rods inserted as expected. No safety related equipment is out of service. Unit 2 has no known Steam Generator Tube leaks.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
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