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Nuclear Event – Manual Reactor Hot Shutdown: River Bend Station, Unit 1, St. Francisville, Louisiana

2018/02/04

Nuclear Event in USA on Thursday, 01 February 2018 at 10:57 [CST].

North America – USA | State of Louisiana, St. Francisville, River Bend Nuclear Power Station
Location: (24 miles NNW of Baton Rouge, LA)  30°45’24.0″N 91°20’00.0″W
Present Operational Age: ~33 years
Event: MANUAL REACTOR SCRAM – HOT SHUTDOWN

Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) – RPS ACTUATION – CRITICAL

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.”

Source: NRC  Event Number: 53192

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