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Plymouth, MA-based Pilgrim Nuclear Power Station is back online after an automatic shutdown over the weekend.

The plant reconnected to the grid Tuesday night and returned to full power around 6:30 Wednesday morning.

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Entergy officials said the automatic shutdown was the result of a broken instrument control line feeding one of the plant’s four main steam isolation valves. The line ended up repaired by company officials.

This is the third shutdown at the Plymouth plant this year. Pilgrim was under additional oversight by the Nuclear Regulatory Commission (NRC) until the end of June as a result of the two earlier shutdowns.

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NRC inspectors found the plant had addressed the areas of weakness responsible for the unplanned shutdowns during winter storms in January.

NRC spokesman Neil Sheehan said the NRC is continuing to review an apparent violation issued to Pilgrim on May 27.

That finding involves the maintenance of the plant’s safety relief valves and stems from a special inspection conducted at the site after January’s shutdown.

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