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Event: Oconee Unit 3 Reactor Protection Sy … Event: Oconee Unit 3 Reactor Protection System (RPS) actuation due to Anticipatory Trip.</br>At 2015 hrs on 5-21-2009, Oconee Nuclear Station Unit 3 experienced a RPS actuation due to an anticipatory trip caused by a generator phase differential lockout. At the time of the RPS actuation, Unit 3 was exiting a planned refueling outage and power was at 42%. Immediately after the trip, Operators entered the appropriate emergency operating procedure and post-trip response was determined to be normal. Operators transitioned to the normal shutdown procedure at 2056 hours. Unit 3 is currently in Mode 3 and stable.</br>This event is being reported as a 4-Hour Non-Emergency per 10 CFR 50.72(b)(2)(iv)(B).</br>Initial Safety Significance: No Emergency Action Limits (EALs) were met and there was no safety significance as a result of the Unit 3 trip. Units 1 and 2 remain at 100% power (Mode 1) and were unaffected by the Unit 3 trip.</br>Corrective Actions(s): Planned corrective actions are to maintain Unit 3 in Mode 3 (Hot Standby) until completion of the post-trip evaluation. The NRC Resident Inspector has been notified.</br>All control rods fully inserted. The reactor is currently subcritical and shutdown margin within Technical Specification limits. RCS Inventory Control is via normal makeup. PORV and Pressurizer Code Safeties are closed. SG inventory control is being maintained via Main Feedwater. Heat is being removed from the Steam Generators to the Main Condenser via Turbine Bypass Valves. Main Condenser via Turbine Bypass Valves. +
00:15:00, 22 May 2009 +
45,088 +
23:09:00, 21 May 2009 +
00:15:00, 22 May 2009 +
Event: Oconee Unit 3 Reactor Protection Sy … Event: Oconee Unit 3 Reactor Protection System (RPS) actuation due to Anticipatory Trip.</br>At 2015 hrs on 5-21-2009, Oconee Nuclear Station Unit 3 experienced a RPS actuation due to an anticipatory trip caused by a generator phase differential lockout. At the time of the RPS actuation, Unit 3 was exiting a planned refueling outage and power was at 42%. Immediately after the trip, Operators entered the appropriate emergency operating procedure and post-trip response was determined to be normal. Operators transitioned to the normal shutdown procedure at 2056 hours. Unit 3 is currently in Mode 3 and stable.</br>This event is being reported as a 4-Hour Non-Emergency per 10 CFR 50.72(b)(2)(iv)(B).</br>Initial Safety Significance: No Emergency Action Limits (EALs) were met and there was no safety significance as a result of the Unit 3 trip. Units 1 and 2 remain at 100% power (Mode 1) and were unaffected by the Unit 3 trip.</br>Corrective Actions(s): Planned corrective actions are to maintain Unit 3 in Mode 3 (Hot Standby) until completion of the post-trip evaluation. The NRC Resident Inspector has been notified.</br>All control rods fully inserted. The reactor is currently subcritical and shutdown margin within Technical Specification limits. RCS Inventory Control is via normal makeup. PORV and Pressurizer Code Safeties are closed. SG inventory control is being maintained via Main Feedwater. Heat is being removed from the Steam Generators to the Main Condenser via Turbine Bypass Valves. Main Condenser via Turbine Bypass Valves. +
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