Gov. Andrew Cuomo has directed state utility regulators to begin a full investigation of the operations and safety protocols at the Indian Point nuclear power plant in Buchanan.

Plant owner Entergy says federal regulators with nuclear expertise say the plant is safe.

Monday evening, one reactor was automatically shut down. The company says the disturbance on the non-nuclear side of the plant is related to a high voltage transmission line. There was no release of radioactivity and no threat to the public. Reactor 3 has since been brought back online.

The other reactor was shut down for three days earlier this month due to a tripped circuit breaker. The two reactors together supply about one-quarter of the power used in New York City and Westchester County.