|The Three Mile Island Nuclear Power Plant|
The accident at Unit 2 (TMI-2) of the Three Mile Island plant near Middletown, Pennsylvania occurred on March 28 1979 in a heavily populated area. It was the most serious accident in the history of U.S. nuclear reactors, though it has not caused any deaths among the staff or the population. It brought radical changes in the mode of operation of the reactors and helped to strengthen the safety rules of the Nuclear Regulatory Commission. These new steps have the effect of improving the safety of reactors in the world.