Control room operators at the Indian Point 3 nuclear power unit returned it to service after it automatically shut down.
Unit 3 shut down as designed Monday night after the main electrical generator sensed an electrical disturbance in the transmission lines that connect the external power grid to the unit. Workers replaced several electrical insulators on a high-voltage transmission line before returning the unit to service. Insulators protect transmission lines and related electrical equipment from the high voltage associated with each line.
Engineers will examine the insulators over the next few days to help determine the cause of the disturbance. Unit 2 operated at full power.
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