Portsmouth Gaseous Diffusion Plant is a facility located in Scioto Township, Pike County, Ohio, just south of Piketon, Ohio, that previously produced enriched uranium, including highly enriched weapons-grade uranium, for the United States Atomic Energy Commission (AEC), the U.S. nuclear weapons program and Navy nuclear propulsion; in later years, it produced low-enriched uranium for fuel for commercial nuclear power reactors. The site never hosted an operating nuclear reactor.
39°00′30″N 83°00′00″W / 39.00833°N 83.00000°W The plant, so named because of its proximity to the city of Portsmouth, Ohio, approximately 22 miles south of the site, was one of three gaseous diffusion plants in the U.S., alongside the K-25 plant in Oak Ridge, Tennessee, and the Paducah Gaseous Diffusion Plant near Paducah, Kentucky. The plant was constructed between 1952 and 1956, with the first enrichment cells going online in 1954.
The former plant facilities are currently undergoing decontamination and decommissioning (D&D). Some site facilities are overseen by the United States Enrichment Corporation, a subsidiary of Centrus Energy. The D&D work on the older facilities to prepare the site for future use is expected to continue through 2024 and is being conducted by Fluor-B&W Portsmouth LLC.