Grand Gulf has been capacity factor impaired for four days. I see River Bend is at 7% after a three day shutdown>
Power Reactor | Event 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) |
Unit | SCRAM Code | RX CRIT | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
1 | A/R | Y | 100 | Power Operation | 0 | Hot 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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