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Exelon Corp. shut down its Limerick Generating Station Unit 1 in Montgomery County, PA, Monday for a planned refueling outage.

As a part of the outage, while the unit is offline, workers replace one third of the reactor’s fuel.

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Refueling outages, which typically occur about every 18 or 24 months for a reactor, end up scheduled for spring and fall when demand for electricity is lower. They are huge undertakings involving thousands of workers, who often conduct other scheduled maintenance work during the weeks when the reactor is offline.

Exelon said that Limerick Unit 2 will continue to generate power during the Unit 1 outage. Unit 1 marked its 30th year in operation in February.

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One year ago, Unit 2 shut down for refueling.

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