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River Bend Station suffered a reactor emergency shutdown Monday resulting in the reactor protection system (RPS) jumping into action, Nuclear Regulatory Commission (NRC) officials said.

Following the scram, reactor water level briefly lowered below level 3.

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A RPS is a set of nuclear safety components in a nuclear power plant designed to safely shutdown the reactor and prevent the release of radioactive materials.

The reactor, located near St. Francisville, LA, is stable with pressure and temperature controlled by the feed water system and main steam bypass valves, respectfully, NRC officials said.

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The cause of the scram was due to a turbine trip/low condenser vacuum, the NRC said. The low vacuum condition resulted from a loss of non-safety related 4160V switchgear that powers two of four circulating water pumps.

A suspected spurious Division II isolation of Reactor Core Isolation Cooling (RCIC) occurred, according to the report. Restoration of RCIC to standby is in progress.

The plant is conducting causal investigations to fully understand the cause of the turbine trip.

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