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On 10/17/10 at 0512 (EDT), Unit 2 experien … On 10/17/10 at 0512 (EDT), Unit 2 experienced an (automatic) reactor trip due to 4 kV group bus under voltage. While restoring the voltage regulator to automatic, following a swap to manual at 0123 (EDT) on 10/17/10 while 500 kV line 5014 was being restored to service, the reactor tripped after placing the voltage regulator in automatic. </br>The crew entered EOP (Emergency Operating Procedure) Trip 1, and then EOP Trip 2 as required. The plant was stabilized at no load conditions. All rods fully inserted on the trip, and all systems responded as designed with RCS (Reactor Coolant System) temperature being controlled via 21 RCP (Reactor Coolant Pump) and the steam dump system. 22, 23, and 24 RCP's tripped on group bus under voltage. The AFW (Auxiliary Feed Water) Pumps started in response to low steam generator levels. 23 AFW was subsequently tripped per procedure since 21 and 22 AFW pumps were in service feeding 21-24 steam generators. </br>Salem Unit 2 is currently in Mode 3. RCS temperature is 547 degrees. RCS pressure is 2235 pounds. All Emergency Core Cooling Systems and Engineered Safety Function Systems are available. No personnel injuries occurred as a result of the trip. No radiological release is in progress due to this event.</br>At 0123 EDT, following the restoration of a 500 kV line, perturbation in the line caused an over current condition which shifted the voltage regulator to manual. After engineering's recommendation, the voltage regulator was placed in automatic shortly prior to the reactor trip. The plant is in a normal shutdown electrical lineup. There was no impact on Salem Unit 1 as a result of this event. </br>The licensee has notified the NRC Resident Inspector.</br>* * * UPDATE FROM BILL MUFFLEY TO JOHN SHOEMAKER 1138 EDT ON 10/18/10 * * *</br>Notified by the licensee that the AFW Pumps started on loss of Steam Generator Feed Pumps which had tripped on low suction pressure.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
09:12:00, 17 October 2010 +
06:38:00, 17 October 2010 +
09:12:00, 17 October 2010 +
On 10/17/10 at 0512 (EDT), Unit 2 experien … On 10/17/10 at 0512 (EDT), Unit 2 experienced an (automatic) reactor trip due to 4 kV group bus under voltage. While restoring the voltage regulator to automatic, following a swap to manual at 0123 (EDT) on 10/17/10 while 500 kV line 5014 was being restored to service, the reactor tripped after placing the voltage regulator in automatic. </br>The crew entered EOP (Emergency Operating Procedure) Trip 1, and then EOP Trip 2 as required. The plant was stabilized at no load conditions. All rods fully inserted on the trip, and all systems responded as designed with RCS (Reactor Coolant System) temperature being controlled via 21 RCP (Reactor Coolant Pump) and the steam dump system. 22, 23, and 24 RCP's tripped on group bus under voltage. The AFW (Auxiliary Feed Water) Pumps started in response to low steam generator levels. 23 AFW was subsequently tripped per procedure since 21 and 22 AFW pumps were in service feeding 21-24 steam generators. </br>Salem Unit 2 is currently in Mode 3. RCS temperature is 547 degrees. RCS pressure is 2235 pounds. All Emergency Core Cooling Systems and Engineered Safety Function Systems are available. No personnel injuries occurred as a result of the trip. No radiological release is in progress due to this event.</br>At 0123 EDT, following the restoration of a 500 kV line, perturbation in the line caused an over current condition which shifted the voltage regulator to manual. After engineering's recommendation, the voltage regulator was placed in automatic shortly prior to the reactor trip. The plant is in a normal shutdown electrical lineup. There was no impact on Salem Unit 1 as a result of this event. </br>The licensee has notified the NRC Resident Inspector.</br>* * * UPDATE FROM BILL MUFFLEY TO JOHN SHOEMAKER 1138 EDT ON 10/18/10 * * *</br>Notified by the licensee that the AFW Pumps started on loss of Steam Generator Feed Pumps which had tripped on low suction pressure.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
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