The 1,268-MW Perry Nuclear Power Plant in Ohio returned to service following a shut down for a scheduled refueling and maintenance outage.

Workers with FirstEnergy Nuclear Operating Co. (FENOC, NYSE: FE) replaced 280 of the 748 fuel assemblies, performed safety inspections on the reactor vessel, turbine and electrical generator; and tested more than 130 valves, replacing several control rod blades, and inspecting and cleaning cooling tower piping. Additionally, two feedwater heaters were also replaced.

Workers also installed a new, large transformer, which is one of two circuits that provide power from the offsite transmission network to the plant’s onsite electrical systems. Installation of the new 20-ft. tall, 115-ton transformer is expected to enhance reliability.

More than 1,000 additional temporary contractors and FENOC employees were onsite during the outage.

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