This is probably a instrumentation problem or employees inproperly calibrating the instrumentation. There is greater than a slight chance of reactor damage.
The Plant is in bad shape. There were two failure points here. Two things were broke or were mis-operated. What tripped the recirc pump and the flow indication problem. They made it a very fragile plant. Nobody really knows the extent of degraded and broken equipment at this facility.
Power ReactorEvent Number: 53192Facility: RIVER BEND
Region: 4 State: LA
Unit: [1] [ ] [ ]
RX Type: [1] GE-6
NRC Notified By: Timothy Gates
HQ OPS Officer: VINCE KLCONotification Date: 02/01/2018
Notification Time: 14:23 [ET]
Event Date: 02/01/2018
Event Time: 10:57 [CST]
Last Update Date: 02/01/2018Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICALPerson (Organization):
RICK DEESE (R4DO)
UnitSCRAM CodeRX CRITInitial PWRInitial RX ModeCurrent PWRCurrent RX Mode1M/RY27Power Operation0Hot Shutdown
Event Text
MANUAL REACTOR SCRAM
"At 1057 CST on February 1, 2018 with the unit in Mode 1 at approximately 27% power, a manual actuation of the Reactor Protection System (RPS) was initiated due to an unexpected trip of the B Recirc Pump with A Recirc Pump in fast speed. B Recirc Pump tripped during transfer from slow to fast speed resulting in single loop operation. Operators were unable to reconcile differing indications of core flow. This resulted in a conservative decision to initiate a manual scram. The cause of the B Recirc Pump trip and the apparent issues with core flow indication are under investigation. The plant is currently stable in Mode 3.
"The plant response to the scram was as expected. All control rods [fully] inserted as expected; the feedwater system is maintaining reactor vessel water level in the normal control band and reactor pressure is being maintained with steam line drains and main turbine bypass valves.
"The NRC Senior Resident [Inspector] has been notified."
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