The Portsmouth plant enriched uranium from 1954 until 2001 through a process called gaseous diffusion.

The Portsmouth Gaseous Diffusion Plant operated from 1954 to 2001. Located in Pike County, Ohio, the plant occupies about 1,200 acres of the 3,777-acre federally-owned Portsmouth Site. The plant was one of three large gaseous diffusion plants in the United States initially constructed to produce enriched uranium to support the nation’s nuclear weapons program and, in later years, enriched uranium used by commercial nuclear reactors. After the Cold War, weapons-grade uranium enrichment was suspended and production facilities were leased to the private sector. In 2001, enrichment operations were discontinued at the site. 

DOE's Office of Environmental Management began its environmental cleanup program at the site in 1989 and the effort continues today in cooperation with the U.S. and Ohio Environmental Protection Agencies.  Decontamination and decommissioning (D&D) of the plant commenced in 2011 and is ongoing.  



Ohio Students Gain Technical Writing Experience Through Office of Environmental Management Assignment
June 28, 2022
Officials from EM and Ohio University recently joined a class at Ohio’s Western High School to celebrate the 11th cohort of students to complete an EM Annual Site Environmental Report (ASER) Summary project.
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Crews Demolish Massive Building at Portsmouth, Achieving EM 2022 Priority
June 16, 2022
The U.S. Department of Energy Office of Environmental Management (EM) recently completed the demolition of the X-326 uranium process building, marking the most significant cleanup milestone to date at its Portsmouth Site.
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White, Congressional Members Survey Portsmouth D&D Progress, Meet With Community Members
May 24, 2022
EM Senior Advisor William “Ike” White accompanied two U.S. House of Representatives members from Ohio on a visit to the Portsmouth Site on May 20.
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Ike White Views Cleanup Progress at Portsmouth, Meets With Local Officials
April 12, 2022
Senior Advisor William “Ike” White and other EM officials recently visited the Portsmouth Site to observe demolition and disposal activities associated with the cleanup program’s mission.
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