Unit 2 of the D.C. Cook nuclear plant in Michigan was taken offline July 6 when a steam leak was discovered in the turbine building.
Plant operator Indiana-Michigan Power declared an Unusual Event with the U.S. Nuclear Regulatory Commission. It was terminated almost two hours later. An expansion joint bellows on a moisture separator reheater ruptured. The component provides non-radioactive steam to the low pressure turbines and is roughly 48 inches in diameter. The rupture released pressurized, high-temperature steam causing damage to an adjacent turbine building exterior wall. There were no reported injuries and no one was in the area at the time. An investigation into the cause and repair estimates are under development.
Unit 1 continued to operate at full power.
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