The unit was temporarily shutdown owing to refueling outage, which began on 25 March 2013.

During the scheduled biennial outage, almost one-third of the reactor’s fuel was replaced and thousands of inspections, equipment upgrades and maintenance activities were performed.

Exelon expects the refueling activities will improve the facility’s operational strength and ensure Limerick’s ability to provide clean, safe and reliable electricity for another two-year operating cycle.

Limerick generating station site vice president Tom Dougherty said, "It takes a great deal of skill, coordination and hard work to execute a refueling outage successfully."

Unit 1 at the nuclear facility continued to operate during the Unit 2 outage.

The Limerick Generating Station has two units that can produce enough carbon free electricity to light up two million homes.