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Three Mile Island nuclear plant shuts down unexpectedly, releasing radioactive steam

Three Mile Island nuclear plant shuts down unexpectedly, releasing radioactive steam --The Three Mile Island nuclear power plant shut down unexpectedly this afternoon, releasing steam containing radiation. 20 Sep 2012 A reactor at the Three Mile Island nuclear power plant shut down unexpectedly this afternoon because of a cooling problem, a month after it went offline because of a leak in the cooling system, the Nuclear Regulatory Commission says. The NRC says a cooling pump for Unit One stopped working at 2:16 p.m. ET, triggering the automatic shutdown, as the system is designed to do. Residents near the plant, outside Harrisburg, Pa., the state capital, reported hearing a loud bang, WHTM-TV says.