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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Portsmouth Contractor Earns Eighth Consecutive ‘STAR’ Safety Recognition
EM contractor PMA recently received DOE VPP “STAR” recognition for the eighth consecutive year on behalf of the infrastructure support workforce.
October 16, 2018
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Energy Department Approves Extension of Portsmouth Site Cleanup Contract
Energy Department Approves Extension of Portsmouth Site Cleanup Contract
September 27, 2018
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Under Secretary Dabbar Visits Portsmouth D&D Project
DOE Under Secretary for Science Paul Dabbar visited the Portsmouth Site last week to learn more about EM’s cleanup.
September 4, 2018
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Portsmouth Site Workers Evaluate ’Bionic’ Vests for Overhead Work
No, Damon Horn is not the “Six-Million-Dollar Man.” He doesn’t even try to imitate actor Lee Majors’s 1970s science fiction TV character.
August 28, 2018
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