Cook Nuclear Plant Unit 1 Returns to Service Following Refueling Outage

More than 1,700 contract workers have packed their bags and departed to the next job sight following completion last night of the Spring refueling outage at Indiana Michigan Power’s Cook Nuclear Plant Unit 1. The work was completed last night and Unit 1 was re-connected to the transmission grid at 5:25 pm, Thursday, May 9th. The outage lasted 65 days.

In addition to refueling the reactor and performing regular maintenance and testing work, the outage included inspection and replacement of baffle bolts, which support internal components of the reactor vessel. Also completed during the outage was a main generator stator rewind, a reactor coolant pump motor and pump seal refurbishment, and various instrumentation and control system modernizations.

Joel Gebbie is Senior Vice President and Chief Nuclear Officer at the Cook Plant. He says, “Completing the baffle bolt work during this outage was a particularly significant milestone for us,” adding, “It represents the last of a multi-year effort to ensure our reactor vessels in both units will operate safely and reliably for years to come.”

Prior to the start of the outage, Cook’s Unit 1 had operated for 463 consecutive days at a capacity factor of 102.2-percent, generating 11,727,171 megawatt-hours of electricity. That marked the second straight cycle that Cook Unit 1 consistently remained online between refueling outages, also known as a breaker-to-breaker run.

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About 1,750 contracted workers supplemented the regular 1,100-person plant staff leading up to and during the outage. More than 12,000 maintenance, inspection and equipment modification job activities totaling 325,000 work-hours were completed during two daily 12-hour work shifts.

At full capacity, the 1,084-net MW Unit 1 and 1,194-net MW Unit 2 combined produce enough electricity for more than one and one half million average homes. Indiana Michigan Power is a wholly owned subsidiary of American Electric Power.