28 March 1979 - Equipment failures, poor user interface design, and worker mistakes contributed to a loss of coolant and a partial core meltdown at the Three Mile Island Nuclear Generating Station 15 km (9.3 mi) southeast of Harrisburg. While the reactor was extensively damaged, on-site radiation exposure was under 100 millirems (less than annual exposure due to natural sources). Area residents received a smaller exposure of 1 millirem (10 μSv), or about 1/3 the dose from eating a banana per day for one year. There were no fatalities. Follow-up radiological studies predict between zero and one long-term cancer fatality.