Event Notification Report for October 09, 2016
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
10/08/2016 - 10/09/2016
EVENT NUMBERS
52292
52292
Power Reactor
Event Number: 52292
Facility: SURRY
Region: 2 State: VA
Unit: [] [2] []
RX Type: [1] W-3-LP,[2] W-3-LP
NRC Notified By: ALAN BIALOWAS
HQ OPS Officer: STEVE SANDIN
Region: 2 State: VA
Unit: [] [2] []
RX Type: [1] W-3-LP,[2] W-3-LP
NRC Notified By: ALAN BIALOWAS
HQ OPS Officer: STEVE SANDIN
Notification Date: 10/09/2016
Notification Time: 06:09 [ET]
Event Date: 10/09/2016
Event Time: 02:54 [EDT]
Last Update Date: 10/09/2016
Notification Time: 06:09 [ET]
Event Date: 10/09/2016
Event Time: 02:54 [EDT]
Last Update Date: 10/09/2016
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
BRIAN BONSER (R2DO)
BRIAN BONSER (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | A/R | Y | 100 | Power Operation | 0 | Hot Shutdown |
AUTOMATIC REACTOR TRIP FOLLOWING MAIN GENERATOR DIFFERENTIAL LOCKOUT TURBINE TRIP
"Surry Unit 2 reactor automatically tripped at 0254 hours on 10/09/2016, due to a Main Generator Differential Lockout Turbine Trip. The cause of the generator differential lockout is under investigation at this time. Reactor Coolant System temperature is currently being maintained at 547 degrees Fahrenheit on the main steam dump valves. All three Auxiliary Feedwater Pumps automatically started 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. The source range nuclear instruments had to be manually reinstated following the reactor trip due to indications of undercompensation on Intermediate Range Nuclear Instrument channel N-36. Off site power remains available. There is no impact on Surry Unit 1.
"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 the Auxiliary Feedwater System.
"The NRC Resident Inspector has been notified and is responding to the site.
"There were no radiation releases, personnel injuries, or contamination events due to this event."
All control rods fully inserted. Secondary reliefs lifted and reseated as expected following a reactor trip from 100% power.
"Surry Unit 2 reactor automatically tripped at 0254 hours on 10/09/2016, due to a Main Generator Differential Lockout Turbine Trip. The cause of the generator differential lockout is under investigation at this time. Reactor Coolant System temperature is currently being maintained at 547 degrees Fahrenheit on the main steam dump valves. All three Auxiliary Feedwater Pumps automatically started 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. The source range nuclear instruments had to be manually reinstated following the reactor trip due to indications of undercompensation on Intermediate Range Nuclear Instrument channel N-36. Off site power remains available. There is no impact on Surry Unit 1.
"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 the Auxiliary Feedwater System.
"The NRC Resident Inspector has been notified and is responding to the site.
"There were no radiation releases, personnel injuries, or contamination events due to this event."
All control rods fully inserted. Secondary reliefs lifted and reseated as expected following a reactor trip from 100% power.