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On November 12, 2018, at 1636 EST, with Su … On November 12, 2018, at 1636 EST, with Surry Unit 1 at 100 percent power and Surry Unit 2 defueled, the 'C' Reserve Station Service Transformer (RSST) pilot wire lockout actuated during restoration of the 'C' RSST following transformer replacement. This resulted in electrical isolation of the 'C' RSST, the 'F' Transfer Bus, the Unit 1 'H' Emergency Bus, and the Unit 2 'J' Emergency Bus. The #1 and #3 Emergency Diesel Generators automatically started and loaded onto the 1H and 2J emergency buses, respectively, as designed. Operations entered the appropriate abnormal procedures and stabilized both units. This equipment operated as expected during the event.</br>The Surry electrical distribution system was in an off-normal alignment to support 'C' RSST replacement with the dependable alternate power supply from Unit 2 station service backfeed supplying the 1H and 2J emergency buses. The 'C' RSST pilot wire lockout tripped and locked out the station service supply tie breaker to the 'F' Transfer Bus.</br>The organization is reviewing the 'C' RSST pilot wire lockout and the required actions for recovery. Surry Unit 1 entered a 6-hour action statement to place the unit in Hot Shutdown due to this partial loss of offsite power. This clock was exited upon reset of the pilot wire lockout, restoring backfeed as a dependable offsite power source. Unit 1 remained at 100 percent power throughout the event.</br>No radiological consequences resulted from this event. This event is being reported pursuant to 10 CFR 50.72(b)(3)(iv)(A) due to actuation of the #1 and #3 Emergency Diesel Generators.</br>The NRC Resident was notified.Generators.
The NRC Resident was notified. +
05:00:00, 12 November 2018 +
53,736 +
20:52:00, 12 November 2018 +
05:00:00, 12 November 2018 +
On November 12, 2018, at 1636 EST, with Su … On November 12, 2018, at 1636 EST, with Surry Unit 1 at 100 percent power and Surry Unit 2 defueled, the 'C' Reserve Station Service Transformer (RSST) pilot wire lockout actuated during restoration of the 'C' RSST following transformer replacement. This resulted in electrical isolation of the 'C' RSST, the 'F' Transfer Bus, the Unit 1 'H' Emergency Bus, and the Unit 2 'J' Emergency Bus. The #1 and #3 Emergency Diesel Generators automatically started and loaded onto the 1H and 2J emergency buses, respectively, as designed. Operations entered the appropriate abnormal procedures and stabilized both units. This equipment operated as expected during the event.</br>The Surry electrical distribution system was in an off-normal alignment to support 'C' RSST replacement with the dependable alternate power supply from Unit 2 station service backfeed supplying the 1H and 2J emergency buses. The 'C' RSST pilot wire lockout tripped and locked out the station service supply tie breaker to the 'F' Transfer Bus.</br>The organization is reviewing the 'C' RSST pilot wire lockout and the required actions for recovery. Surry Unit 1 entered a 6-hour action statement to place the unit in Hot Shutdown due to this partial loss of offsite power. This clock was exited upon reset of the pilot wire lockout, restoring backfeed as a dependable offsite power source. Unit 1 remained at 100 percent power throughout the event.</br>No radiological consequences resulted from this event. This event is being reported pursuant to 10 CFR 50.72(b)(3)(iv)(A) due to actuation of the #1 and #3 Emergency Diesel Generators.</br>The NRC Resident was notified.Generators.
The NRC Resident was notified. +
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00:00:00, 12 November 2018 +
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