VIDEOS: Monday marked the 43rd anniversary of the accident at the Three Mile Island nuclear plant, the nationâs worst nuclear accident.
A combination of human error and malfunctioning controls resulted in a partial meltdown of the Unit 2 reactor and caused tens of thousands of Central Pennsylvania residents to be evacuated or to flee the area for several days in 1979.
Unit 2 never was reopened and has been placed in monitored storage until the Unit 1 reactor is closed and decommissioned. In 2017, Exelon announced preliminary plans to close the facility unless a buyer was found; after no sale was reached, Unit 1 was officially shut down in December of 2019. Decommissioning is expected to last until 2079.
