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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 Launches Redesigned Virtual Museum on History of Portsmouth Site
December 15, 2020
EM recently launched a remodeled version of its popular virtual museum website covering the history of the Portsmouth Site.
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Portsmouth Site D&D Contractor Marks 4 Million Safe Work Hours
December 8, 2020
Workers for the deactivation and decommissioning prime contractor at the Portsmouth Site recently celebrated 4 million safe work hours without a lost.
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Portsmouth Site Installs Water Treatment System for Disposal Facility
November 24, 2020
EM’s Portsmouth/Paducah Project Office is installing the water treatment system for its On-Site Waste Disposal Facility.
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Portsmouth Site, State Enhance Air Monitoring Ahead of Major Demolitions
November 10, 2020
Additional air monitoring stations are being installed that will enhance environmental and radiological data collection during demolition.
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