Junk Plant Watts Bar 2: New Plant Scram On Unreliable Equipment.

Power Reactor	Event Number: 52194
Facility: WATTS BAR Region: 2 State: TN Unit: [ ] [2] [ ] RX Type: [1] W-4-LP,[2] W-4-LP NRC Notified By: DAVID ALLEN HQ OPS Officer: JEFF HERRERA	Notification Date: 08/23/2016 Notification Time: 15:30 [ET] Event Date: 08/23/2016 Event Time: 13:56 [EDT] Last Update Date: 08/23/2016
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	Person (Organization): ERIC MICHEL (R2DO)

Unit	SCRAM Code	RX CRIT	Initial PWR	Initial RX Mode	Current PWR	Current RX Mode
2	M/R	Y	43	Power Operation	0	Hot Standby

Event Text

MANUAL TRIP DUE TO A LOSS OF MAIN FEEDWATER "On August 23, 2016, at 1356 EDT, Watts Bar Nuclear Plant [WBN] Unit 2 reactor was manually tripped due to a loss of main feedwater. "Concurrent with the reactor trip, the Auxiliary Feedwater system actuated as designed. "All control and shutdown rods fully inserted. All safety systems responded as designed. The unit is currently stable in Mode 3, with decay heat removal via Auxiliary Feedwater and main steam dump systems. Unit 2 is in a normal shutdown electrical alignment. "The cause is currently under investigation. "This is being reported under 10CFR 50.72(b)(3)(iv)(A) and 10CFR 50.72(b)(2)(iv)(B). "There was no effect on WBN Unit 1. "The NRC Senior Resident Inspector has been notified."