Three Mile Island (TMI)

The Three Mile Island station is located on 814 acres of an island near the state capitol at Harrisburg. Three Mile Island may be the most widely known nuclear power plant in the United States due to an accident to its number 2 reactor. The second reactor was permanently shut down following an accident on March 28, 1979. A combination of equipment malfunctions and human error led to a loss of coolant. It remains the most significant accident on record at a U.S. nuclear power plant.