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On November 4, 2003, at approximately 1732 … On November 4, 2003, at approximately 1732 hours, Unit 2 received a generator/turbine trip due to loss of excitation, which resulted in a Reactor Protection System (RPS) trip. Plant response to the reactor shutdown resulted in High Pressure Coolant Injection and Reactor Core Isolation Cooling (RCIC) system actuations on low reactor coolant level. Additionally, primary containment isolation system actuation signals for valve groups 1, 2, 3 , 6, 8, and 10 were received and the valves closed as required. All four emergency diesel generators automatically started, but did not load because power was never lost to the emergency buses. The loss of power from the generator trip resulted in reactor building ventilation isolation and automatic start of both trains of the Standby Gas Treatment (SBGT) system. SBGT Train A immediately tripped, but was successfully placed in service. All control rods fully inserted into the core. At approximately 1857 hours, another RPS trip was received due to low reactor coolant level while cycling Safety Relief Valves; however, all control rods were already inserted.</br>The safety significance of this event is considered to be minimal. The plant responded as designed to the transient with the exception of the SBGT Train A initial starting issue.</br>An event investigation team has been assembled to determine the cause of the event. Plant response to the event</br>is being evaluated and identified issues will be addressed prior to plant restart.</br>The licensee reported that the station electrical grid is normal and the emergency diesel generators have been shutdown and returned to standby status. The current plant conditions are 550 psi, 496 degrees F with RCIC operating to maintain reactor water level. The main condenser is available and being used to dump steam from the reactor. Two safety relief valves opened during the transient and reclosed as expected. The reactor water level decreased to minimum of approximately 90 inches during the transient. The cause of main steam isolation valve (MSIV) closure is under investigation.</br>The licensee also reported that this event caused a Group 6 Isolation, reactor building ventilation isolation, and standby gas treatment actuation signal on Brunswick Unit 1. These Unit 1 systems have been returned to a normal configuration.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector.
22:32:00, 4 November 2003 +
21:20:00, 4 November 2003 +
22:32:00, 4 November 2003 +
On November 4, 2003, at approximately 1732 … On November 4, 2003, at approximately 1732 hours, Unit 2 received a generator/turbine trip due to loss of excitation, which resulted in a Reactor Protection System (RPS) trip. Plant response to the reactor shutdown resulted in High Pressure Coolant Injection and Reactor Core Isolation Cooling (RCIC) system actuations on low reactor coolant level. Additionally, primary containment isolation system actuation signals for valve groups 1, 2, 3 , 6, 8, and 10 were received and the valves closed as required. All four emergency diesel generators automatically started, but did not load because power was never lost to the emergency buses. The loss of power from the generator trip resulted in reactor building ventilation isolation and automatic start of both trains of the Standby Gas Treatment (SBGT) system. SBGT Train A immediately tripped, but was successfully placed in service. All control rods fully inserted into the core. At approximately 1857 hours, another RPS trip was received due to low reactor coolant level while cycling Safety Relief Valves; however, all control rods were already inserted.</br>The safety significance of this event is considered to be minimal. The plant responded as designed to the transient with the exception of the SBGT Train A initial starting issue.</br>An event investigation team has been assembled to determine the cause of the event. Plant response to the event</br>is being evaluated and identified issues will be addressed prior to plant restart.</br>The licensee reported that the station electrical grid is normal and the emergency diesel generators have been shutdown and returned to standby status. The current plant conditions are 550 psi, 496 degrees F with RCIC operating to maintain reactor water level. The main condenser is available and being used to dump steam from the reactor. Two safety relief valves opened during the transient and reclosed as expected. The reactor water level decreased to minimum of approximately 90 inches during the transient. The cause of main steam isolation valve (MSIV) closure is under investigation.</br>The licensee also reported that this event caused a Group 6 Isolation, reactor building ventilation isolation, and standby gas treatment actuation signal on Brunswick Unit 1. These Unit 1 systems have been returned to a normal configuration.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector.
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Brunswick +, Unit 2 +, 05000271/LER-2003-004, Hearing - Entergy Exhibit 13, LER 2003-004-00, Brunswick, Unit 2, Loss of Generator Excitation Results in Reactor Protection System and Other Specified System Actuations +, Hearing - Entergy Exhibit 13 +, LER 2003-004-00 + and Loss of Generator Excitation Results in Reactor Protection System and Other Specified System Actuations +
00:00:00, 4 November 2003 +
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22:32:00, 4 November 2003 +
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