Unit 2 of the Cook Nuclear Plant is back in service. It had been shut down July 6 due to a rupture in a steam expansion joint bellows which damaged the Turbine Building exterior wall. Indiana Michigan Power says the failure looks to have been caused by vibration-induced metal fatigue. Repairs made include improvements to the expansion joint to ensure it’s reliable until taken off line this fall for a refueling outage. At that point, more comprehensive design change improvements will be made. Unit 2 went back into service at 6 p.m. Tuesday.
