The Pilgrim nuclear power plant in Massachusetts is back online following a three-day shutdown to repair a leak in a cooling system.

Operators started a controlled shutdown of the 685 MW plant Feb. 20 after monitors detected a leak in a tube that carries salt water and is used in a cooling system. The plant uses sea water to help cool the plant’s turbines. The shutdown was also reported to the Nuclear Regulatory Commission.

Entergy, which owns Pilgrim, said the event had no impact on the public’s health or safety.

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