The last reactor at the Three Mile Island nuclear power plant in Pennsylvania was finally shut down Friday, marking the end of the operation of the site of the worst civilian nuclear accident in US history. The plant’s first reactor — which went online in September 1974 — was shut down at noon local time (1600 GMT), according to the plant’s owner Exelon, and the site will be dismantled in the coming weeks. On March 28, 1979, the second reactor experienced a cooling problem that — coupled with a human error — resulted in the partial melting of the reactor and the evacuation of 14,000 people.
