Nuclear power plant to shut down for maintenance

Indiana Michigan Power, a subsidiary of American Electric Power (NYSE: AEP), said its 1,077 MW Cook Nuclear Plant Unit 2 began power reduction March 19 in preparation for its 19th refueling outage, which is scheduled to begin the following day.

The unit ran for 471 consecutive days since the previous refueling. The projected capacity factor for the fuel cycle is 101.7 percent with a net generation of 12,393 GWh.

Aside from refueling the reactor and performing regular maintenance and testing work, the current outage also includes installation of new main output transformers. There is a separate 223-ton transformer for each of the three electric phases of the output of the Unit 2 main generator. The transformers increase the 26,000 volt generator output to 765,000 volts. The new transformers replace the original transformers that have been in service since the unit began operation in 1978.

Over the course of the outage, about 1,000 contracted workers will supplement the regular 1,100-person plant staff. More than 12,000 maintenance, inspection and equipment modification job activities totaling more than 250,000 work-hours are scheduled for two daily 12-hour work shifts.

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