Nuclear power plant automatically shuts down

Exelon Corp. (NYSE: EXC) said the single-unit, 852 MW Three Mile Island Generating Station automatically shut down at 2:20 p.m. EDT Sept 20 after a trip of the C reactor coolant pump. Exelon said the plant, about 12 miles south of Harrisburg, Pa., responded as designed and remains in normal shutdown condition while operators investigate the cause.

During the shutdown, steam was released into the atmosphere, creating a loud noise heard by nearby residents.

TMI uses equipment to continuously monitor plant systems and conditions and the plant is designed to automatically shut down when necessary. Exelon did not say when the plant would return to service.

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