Portsmouth Site

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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.  


Portsmouth Environmental Cleanup
Portsmouth Cleanup Program was established in 1989 to evaluate and take appropriate actions to ensure protection of human health and the environment.
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Portsmouth D&D Program
The Decontamination & Decommissioning (D&D) Program at the Portsmouth Site addresses recent, current and planned demolition of facilities.
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Portsmouth Future Use
DOE's D&D project helps prepare the site for reuse, supporting the community’s vision to redevelop the Portsmouth Site property.
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Portsmouth Community Outreach
DOE is committed to fostering meaningful public involvement in environmental remediation decision-making at the Portsmouth Site.
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DOE Releases Request for Information/Sources Sought for Portsmouth Gaseous Diffusion Plant (GDP) Decontamination and Decommissioning (D&D)
November 14, 2018
DOE today issued a Request for Information/Sources Sought for the Portsmouth Gaseous Diffusion Plant (GDP) Decontamination and Decommissioning Project
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Record Number of Students Learn About Portsmouth Careers at Science Alliance
October 30, 2018
The EM Portsmouth Site’s ninth annual Science Alliance event recently drew a record number of participants from southern Ohio schools.
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Portsmouth Contractor Earns Eighth Consecutive ‘STAR’ Safety Recognition
October 16, 2018
EM contractor PMA recently received DOE VPP “STAR” recognition for the eighth consecutive year on behalf of the infrastructure support workforce.
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Energy Department Approves Extension of Portsmouth Site Cleanup Contract
September 27, 2018
Energy Department Approves Extension of Portsmouth Site Cleanup Contract
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