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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 Environmental Monitoring
Information about DOE's program to detect and eliminate environmental hazards at or near the Portsmouth Site.
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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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EM Makes Progress on 2020 Priorities at Portsmouth, Brookhaven, ETEC Sites
October 20, 2020
While adapting operations due to the COVID-19 pandemic, EM has continued closing in on a key 2020 priority to begin demolition at the Portsmouth Site.
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EM Supports ‘Virtual STEM Camp’ for Ohio Youth
September 1, 2020
A virtual science, technology, engineering, and math camp supported by a grant from EM was conducted recently.
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DOE Issues Decision on Disposal of Depleted Uranium Oxide From Kentucky, Ohio Plants
June 5, 2020
The U.S. Department of Energy today issued a formal Record of Decision (ROD) for the safe shipment and disposal of depleted uranium oxide.
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Portsmouth and Paducah Cleanup Set to Make Significant Impacts
March 17, 2020
EM’s Portsmouth/Paducah Project Office is set to make the first major skyline change later this year with demolition beginning on the X-326 building.
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