Monday, August 15, 2016

Junk Plant Watts Bar 1 Pre-Operation Testing


Power ReactorEvent Number: 52177
Facility: WATTS BAR
Region: 2 State: TN
Unit: [ ] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: MATTHEW MILLER
HQ OPS Officer: DONALD NORWOOD
Notification Date: 08/13/2016
Notification Time: 08:51 [ET]
Event Date: 08/13/2016
Event Time: 03:36 [EDT]
Last Update Date: 08/13/2016
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
SCOTT SHAEFFER (R2DO)

UnitSCRAM CodeRX CRITInitial PWRInitial RX ModeCurrent PWRCurrent RX Mode
2NN0Hot Standby0Hot Standby
Event Text
AUTOMATIC START OF TURBINE DRIVEN AUXILIARY FEED WATER PUMP

"On August 13, 2016 at 0330 EDT, Watts Bar Nuclear Plant Unit 2 (WBN2) was being stabilized following a pre-planned reactor trip. Both motor driven auxiliary feed water pumps and the turbine driven auxiliary feed water pump (TDAFW pump) were in operation maintaining steam generator water level 6 - 50 percent in accordance with the Reactor Trip Response Procedure.

"At 0333 EDT the TDAFW pump was secured by procedure and steam generator water level lowered to the Low Low Alarm setpoint (17 percent). The trip time delay
Testing the TDAFW pump.
at 0 percent power is three (3) minutes. At 0336 EDT, the TDAFW pump automatically started with steam generator water levels less than the Low Low alarm setpoint (lowest level reached was 15 percent).

"Steam generator water level was restored to the normal shutdown control band (38 percent).

"Unit 1 remains in Mode 1 at 85 percent.

"Unit 2 is stable in Mode 3 with normal shutdown power alignment. The reactor coolant system is being cooled down to 400 degrees F for a planned maintenance period, with decay heat removal via the Main Condenser Steam dumps and the AFW system.

"This event is being reported pursuant to 10 CFR 50.72(b)(3)(iv)(A).

"TVA has notified the NRC Resident Inspector."

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