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A faulty sensor led to the automatic shutdown of a reactor in Buchanan, New York, just north of New York City, officials said.

Indian Point nuclear plant officials said the Westchester County facility’s Unit 3 safety systems kicked in around noon Wednesday after a sensor detected a reactor pressure change. The catch is, however, there was no pressure change, said spokesman Jerry Nappi.

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The 1,000-megawatt reactor remains offline while workers determine the cause of the false signal, Nappi said, adding they will fix the sensor before they restart it.

Nappi said the plant’s other reactor is still operating and the shutdown shouldn’t cause outages since demand isn’t at peak levels.

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The Nuclear Regulatory Commission (NRC) said the shutdown occurred as workers were testing safety systems. An NRC spokesman said there were no health or safety risks.

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