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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Radpiper Robots Crawl to Successful Run in Portsmouth Plant's Enrichment Pipes
The Radpipers moved at an “impressively efficient pace” — up to 10 ft/minute — within the 30-inch & 42-inch-diameter uranium enrichment process pipes.
August 15, 2018
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Upgrades Allow Conversion of DUF6 From Non-Standard Cylinders
EM recently launched long-planned systems to safely handle the disposition of non-standard storage cylinders containing depleted uranium hexafluoride.
July 31, 2018
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Assistant Secretary White Attends Portsmouth Site Land Transfer Event, Visits EMCBC
EM Assistant Secretary Anne White signed documents at the Portsmouth Gaseous Diffusion Plant marking the site’s land transfer to the local community.
July 24, 2018
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DOE Awards Contract for the Portsmouth/Paducah Project Office Technical Support Services Acquisition
DOE Awards Contract for the Portsmouth/Paducah Project Office Technical Support Services Acquisition
June 28, 2018
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