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Three Mile Island in 1979 was categorized as a Level 5 accident on the INES scale because of the <unk>severe damage to the reactor core<unk> and the radiation leak caused by the incident.<unk> Three Mile Island in 1979 was categorized as a Level 5 accident on the INES scale because of the <unk>severe damage to the reactor core<unk> and the radiation leak caused by the incident. Three Mile Island was the most serious accident in the history of American commercial nuclear power plants, yet the effects were different from those of the Chernobyl accident. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️