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Event Notification Report for October 14, 2015

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
10/13/2015 - 10/14/2015

** EVENT NUMBERS **


51467

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Power Reactor Event Number: 51467
Facility: SURRY
Region: 2 State: VA
Unit: [1] [ ] [ ]
RX Type: [1] W-3-LP,[2] W-3-LP
NRC Notified By: THOMAS OLIVER
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 10/13/2015
Notification Time: 21:20 [ET]
Event Date: 10/13/2015
Event Time: 18:15 [EDT]
Last Update Date: 10/13/2015
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Person (Organization):
SHAKUR WALKER (R2DO)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 A/R Y 100 Power Operation 0 Hot Standby

Event Text

REACTOR TRIP AFTER A TURBINE TRIP

"Surry Unit 1 Reactor automatically tripped at 1815 hours [EDT] on 10/13/2015 due to a Generator Differential Lockout Turbine trip. The cause of the Generator Differential Lockout is under investigation at this time. Reactor Coolant System is currently being maintained at 548 degrees F on the Steam Generator PORVs due to closing Main Steam Trip Valves manually. All three Auxiliary Feedwater Pumps started automatically as designed on Low-Low Steam Generator Water Level following the trip. Auxiliary Feedwater Pumps have since been secured and Main Feedwater is in use. All systems operated as required. Off-site power remains available. There is no impact on Surry Unit 2.

"This notification is being made pursuant to 10CFR50.72(b)(2)(iv)(B) for 4 hour notification of Reactor Protection System activation and 10CFR50.72(b)(3)(iv)(A) for 8 hour notification of automatic actuation of Auxiliary Feedwater. The NRC Resident Inspector has been notified and is on site.

"There were no radiation releases, personnel injuries, or contamination events due to this event."

All control rods fully inserted during the reactor trip. The Main Steam Trip Valves were shut due to excessive cooldown. The plant is in its normal shutdown electrical lineup. There is no steam generator tube leakage.

Page Last Reviewed/Updated Wednesday, October 14, 2015
Wednesday, October 14, 2015