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BUCHANAN, N.Y. -- Federal regulators say an error by maintenance workers caused this week's shutdown of a reactor at the Indian Point nuclear plant.

Reactor Unit 2 remains temporarily shut down after two water pumps stopped working.

According to the Nuclear Regulatory Commission, workers left valves open that drained water from a tank at the plant. That caused the shutdown of two pumps that send water to a steam generator.

The pumps are located on the non-nuclear side of the plant and officials say that there was no threat of radioactivity being released. They also say there was never any threat to the safety of the employees and the public.

Officials say reactor Unit 3 is operating at full power and Unit 2 is expected to be back up to full power by the weekend.