Monday, August 21, 2017

Entergy: Continued Severe Capacity Factor Issues With Southern Fleet

Grand Gulf has been capacity factor impaired for four days. I see River Bend is at 7% after a three day shutdown>

Power ReactorEvent Number: 52915
Facility: RIVER BEND
Region: 4 State: LA
Unit: [1] [ ] [ ]
RX Type: [1] GE-6
NRC Notified By: DAN JAMES
HQ OPS Officer: BETHANY CECERE
Notification Date: 08/18/2017
Notification Time: 23:41 [ET]
Event Date: 08/18/2017
Event Time: 20:55 [CDT]
Last Update Date: 08/18/2017
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Person (Organization):
THOMAS FARNHOLTZ (R4DO)

UnitSCRAM CodeRX CRITInitial PWRInitial RX ModeCurrent PWRCurrent RX Mode
1A/RY100Power Operation0Hot Shutdown
Event Text
AUTOMATIC SCRAM WHILE AT 100 PERCENT POWER

"At 2055 CDT on August 18, 2017, an automatic actuation of the reactor protection system occurred while the plant was operating at 100 percent power. No plant parameters requiring the actuation of the emergency diesel generators or the emergency core cooling system were exceeded. The main feedwater system remained in service following the scram to maintain reactor water level, and the main condenser remained available as the normal heat sink.

"The scram occurred after a planned swap of the main feedwater master controller channels in preparation for scheduled surveillance testing. When the channel swap was actuated, the feedwater regulating valves moved to the fully open position. The scram signal originated in the high-flux detection function of the average power range monitors, apparently from the rapid increase in feedwater flow.

"The cause of the apparent feedwater controller malfunction is under investigation. The NRC Resident Inspector has been notified."

No safety relief valves opened. Decay heat is being removed via steam to the main condenser using the bypass valves and steam drains. The licensee intends to go to Cold Shutdown to investigate the malfunction.

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