Junk Plant ANO 1 Still Indicating A Very Troubled Plant

They got only one of two backup cooling systems working after the scram. They were just coming out of a outage.

ower Reactor	Event Number: 53404
Facility: ARKANSAS NUCLEAR Region: 4     State: AR Unit: [1] [] [] RX Type: [1] B&W-L-LP,[2] CE NRC Notified By: KEVIN PARKS HQ OPS Officer: DONALD NORWOOD	Notification Date: 05/16/2018 Notification Time: 22:19 [ET] Event Date: 05/16/2018 Event Time: 17:50 [CDT] Last Update Date: 05/16/2018
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): HEATHER GEPFORD (R4DO)

Unit

SCRAM Code

RX Crit

Initial PWR

Initial RX Mode

Current PWR

Current RX Mode

1

A/R

Y

10

Power Operation

0

Hot Standby

Event Text

AUTOMATIC REACTOR TRIP DUE TO LOSS OF MAIN FEEDWATER PUMP "At 1750 CDT, the Arkansas Nuclear One, Unit 1 (ANO-1) reactor tripped due to the trip of the 'B' Main Feedwater Pump. Unit 1 was at 10 percent power with escalation of power in progress with one Main Feedwater Pump in service. Investigation is in progress as to the cause of the Main Feedwater Pump trip. The Main Feedwater Pump trip resulted in RPS [reactor protection system] actuation on loss of both Main Feedwater Pumps and resulted in Emergency Feedwater (EFW) actuation. All Control Rods inserted into the core properly and the reactor was verified shutdown. "EFW experienced a half-trip on the 'A' train of Emergency Feedwater Initiation and Control (EFIC) at time of system actuation, but was successfully actuated manually immediately upon discovery. Train 'B' EFIC actuated in Automatic as designed. The half-trip of the 'A' train of EFIC is currently believed to be associated with EFIC Channel 'C'; however, investigation is underway to verify this. "Currently, ANO-1 has been stabilized and is being maintained in Mode 3 with Auxiliary Feedwater in service. Heat removal is via Turbine Bypass valves to the Condenser. "No radiological releases have occurred due to this event." There was no effect on Arkansas Nuclear One, Unit 2. The licensee notified the NRC Resident Inspector and the State of Arkansas.