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The Three Mile Island accident was a partial nuclear meltdown of the Unit 2 reactor (TMI-2) of the Three Mile Island Nuclear Generating Station.It happened on the Susquehanna River in Londonderry Township, near Harrisburg, Pennsylvania.
The Three Mile Island Unit 2 was also a pressurized water reactor constructed by B&W, similar to Unit 1. TMI-2 was slightly larger with a net generating capacity of 906 MW e, compared to TMI-1, which delivered 819 MW e. Unit 2 received its operating license on February 8, 1978, and began commercial operation on December 30, 1978.
The Unit 1 reactor on Three Mile Island, which closed in 2019, is adjacent to the Unit 2 reactor that experienced a major nuclear power accident in 1979. ANDREW CABALLERO-REYNOLDS/AFP via Getty.
The effects of the 1979 Three Mile Island nuclear accident are widely agreed to be very low by scientists in the relevant fields. The American Nuclear Society concluded that average local radiation exposure was equivalent to a chest X-ray and maximum local exposure equivalent to less than a year's background radiation. [1]
Three Mile Island's Unit 2 reactor shut down after an infamous partial meltdown in 1979, but the Unit 1 reactor kept going until 2019. MediaNews Group/Reading Eagle via Getty Images.
That day, the problematic Three Mile Island nuclear plant reached partial meltdown, beginning The worst nuclear accident in American history took place near Middletown, Penn., on March 28, 1979.
During the Three Mile Island accident, a slow partial meltdown of the reactor core occurred. About 41,900 pounds (19,000 kg) of material melted and relocated in about 2 minutes, approximately 224 minutes after the reactor scram .
Exelon said it will take a one-time charge of $65-110 million for 2017 for the early retirement of Three Mile Island, and accelerate about $1.0-1.1 billion in depreciation and amortization through ...