BRIDGMAN, Mich., July 6, 2016 – Indiana Michigan Power’s Cook Nuclear Plant Unit 2 was taken off-line at 12:38 a.m. today when an expansion joint bellows on a Moisture Separator Reheater ruptured. That component provides non-radioactive steam to the low pressure turbines. The expansion joint bellows is roughly 48 inches in diameter. The rupture released pressurized, high-temperature steam to the surrounding area causing damage to an adjacent Turbine Building exterior wall. No one was in the area at the time and there were no injuries.
An Unusual Event (UE) was declared at 12:50 a.m. due to the unanticipated event. It was terminated at 2:07 a.m. A UE is the least serious emergency plan classification. All appropriate notifications to local, state and federal officials were made. During the manual shutdown by operators there were no complications and all equipment responded appropriately.
Cook Unit 1 remains at 100 percent power. Causal analysis and repair estimates are under development. AEP does not release return-to-service information for generation units.