Three Mile Island Nuclear Generating Station (TMI)
is a civilian nuclear power plant
(NPP) located on Three Mile Island in the Susquehanna River
, south of Harrisburg, Pennsylvania
. It has two separate units, known as 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 March 28, 1979, when TMI-2 suffered a partial meltdown
. According to the US Nuclear Regulatory Commission
, the accident resulted in no deaths or injuries to plant workers or members of nearby communities. 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
, through the selling of its outstanding common stock.
The Nuclear Regulatory Commission
defines two emergency planning zones around nuclear power plants: a plume exposure pathway zone with a radius of ,... Read More