Three Mile Island
| Three Mile Island Nuclear Generating Station | |
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The Three Mile Island NPP on Three Mile Island, circa 1979
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 Location of Three Mile Island Nuclear Generating Station in Pennsylvania
Location of Three Mile Island Nuclear Generating Station in Pennsylvania
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| Location | Londonderry Township, Dauphin County, near Middletown, Pennsylvania, USA |
| Coordinates | 40°9′14″N 76°43′29″W / 40.15389°N 76.72472°WCoordinates: 40°9′14″N 76°43′29″W / 40.15389°N 76.72472°W |
| Status | Unit 1: Operational Unit 2: Decommissioned |
| Construction began | 1968–1970 |
| Commission date | September 2, 1974 |
| Operator(s) | Exelon Nuclear |
| Nuclear power station | |
| Reactor type | PWR |
| Reactor supplier | Babcock & Wilcox |
| Power generation | |
| Nameplate capacity | 852 MW |
| Annual gross output | 6,645 GWh |
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Website Three Mile Island |
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Three Mile Island Nuclear Generating Station (TMI) is a nuclear power plant located on Three Mile Island in the Londonderry Township of Pennsylvania, on the Susquehanna River just south of Harrisburg, the state capital. It has two separate units, TMI-1 and TMI-2. The plant is widely known for having been the site of the most significant accident in United States commercial nuclear energy, on 28 March 1979, when TMI-2 suffered a partial meltdown. According to the Nuclear Regulatory Commission (NRC), the accident resulted in no deaths or injuries to plant workers or members of nearby communities. Follow-up epidemiology studies have also not linked any incidents of cancer with the accident. The reactor core of TMI-2 has since been removed from the site, but the site has not been decommissioned.
Three Mile Island is so named because it is located three miles downriver from Middletown, Pennsylvania. The plant was originally built by General Public Utilities Corporation, later renamed GPU Incorporated. The plant was operated by Metropolitan Edison Company (Met-Ed), a subsidiary of the GPU Energy division. During 2001 GPU Inc. merged with FirstEnergy Corporation.
The NRC defines two emergency planning zones around nuclear power plants: a plume exposure pathway zone with a radius of 10 miles (16 km), concerned primarily with exposure to, and inhalation of, airborne radioactive contamination, and an ingestion pathway zone of about 50 miles (80 km), concerned primarily with ingestion of food and liquid contaminated by radioactivity.
The 2010 U.S. population within 10 miles (16 km) of Three Mile Island was 211,261, an increase of 10.9 percent in a decade, according to an analysis of U.S. Census data for msnbc.com. The 2010 U.S. population within 50 miles (80 km) was 2,803,322, an increase of 10.3 percent since 2000. Cities within 50 miles include Harrisburg (12 miles to city center), York (13 miles to city center), and Lancaster (24 miles to city center).
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