Portsmouth Gaseous Diffusion Plant

Also Known As: Piketon, A-Plant, Goodyear Atomic
State: Ohio
Location: Piketon
Time Period: 1952 – 7/28/98; 7/29/98 – present (Remediation); 5/2001- present (cold standby)
Facility Type: Department of Energy

Facility Description

The U.S. began construction of Portsmouth in 1952 in order to expand the nation’s gaseous diffusion program. The gaseous diffusion plants already operating in Oak Ridge, TN and Paducah, KY were not able to fulfill the nation’s need for highly enriched and low-enriched uranium. Portsmouth was used for isotope separation. Beginning in 1954, Portsmouth produced highly enriched uranium to support nuclear weapons production and, later, for use by submarine, research, and test reactors. The high-enrichment portion of the diffusion cascade was shut down in 1991.

On July 1, 1993, the United States Enrichment Corporation (USEC)*, a government-owned corporation formed under the Energy Policy Act of 1992, assumed control of the plant’s production activities. USEC, which was fully privatized in 1998, continued to produce enriched uranium for commercial use at this location until May 11, 2001 when production ceased based on a USEC business decision. USEC currently maintains the Portsmouth plant in a cold standby mode, under a contract with the Department of Energy. The Department of Energy maintains responsibility for addressing the environmental legacy left by historic plant operations. It should also be noted that the area currently under control of DOE’s Office of Environmental Management excludes that area of the plant which is leased to USEC.

Throughout the course of its operations, the potential for beryllium exposure existed at this site.

CONTRACTORS: USEC*(2001-present)(cold standby); Los Alamos Technical Associates and Parallax Portsmouth (LATA/LPP) (June 27, 2005 – September 30, 2009) (remediation); Theta Pro2Serve Management Company (TPMC) (June 27, 2005 – September 30, 2009) (remediation);

Bechtel Jacobs company LLC (1998-June 27, 2005)(remediation); Lockheed Martin Energy Systems, Inc. (1995-1998); Martin Marietta Energy Systems (1986-1995); Goodyear Atomic Corporation (1954-1986)

CONTRACTOR for design, construction and operation of the Depleted Uranium Hexaflouride Conversion Project: Uranium Disposition Services (August 29, 2002 – Present)

*Note: Rights and liabilities pertaining to USEC are governed by the USEC Privatization Act (P.L. 104-134, April 26, 1996). This includes regulatory oversight by the Nuclear Regulatory Commission of that portion of the plant under USEC control.


Portsmouth Gaseous Diffusion Plant is listed as a Department of Energy (DOE) site under the EEOICPA.

Special Exposure Cohort (SEC) Classes

Gaseous Diffusion Plants–employees who worked at least 250 days before February 1, 1992, at a gaseous diffusion plant in Paducah, Kentucky; Portsmouth, Ohio; or Oak Ridge, Tennessee and who were or could have been monitored in those jobs using dosimetry badges

Note: The SEC was established by The Act. The Portsmouth Gaseous Diffusion Plant was one of the classes that Congress included when The Act was signed.


As of 08/23/2015, the total compensation paid under Parts B and E of the EEOICPA, including medical compensation, for workers suffering from the effects of having worked at the Portsmouth Gaseous Diffusion Plant is $710,198,723.

Attention Portsmouth Gaseous Diffusion Plant Workers (1940-1992)

Did you, your spouse, or your parent become ill after working at the Portsmouth Gaseous Diffusion Plant? You may be entitled to up to $400,000 from the United States. For more information, call Attorney Hugh Stephens at (800) 548-4494, whether or not you have already filed a claim and even if your claim has been accepted or denied.

We assist with claims, dose reconstructions, objections, hearings, reopenings, consequential conditions, impairment ratings, wage loss, health care, home care and appeals to Federal Court. No Recovery-No Fee. 2% contingent fee for initial claims/10% for objections. 2495 Main St., Buffalo, NY.
We can help with all OWCP (Federal Workers Compensation) claims, impairments, wage loss and health care. 2495 Main Street, Suite 442 Buffalo, NY.


A two-part history of the Portsmouth Gaseous Diffusion Plant can be seen below:                  

Part I

Part II


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If you or your parent worked any of the DOE or AWE facilities listed on this website and became ill, you may be entitled to compensation of up to $400K plus medical benefits from the US Department of Labor.

Call EEOICPA Counsel Hugh Stephens at 1-800-548-4494, email hstephens@stephensstephens.com, or fill out the form below whether or not you have already filed a claim and even if your claim has been accepted or denied.

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*note: Submission of this form does not establish an attorney-client privilege​.

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2495 Main Street, Suite 442
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R. William Stephens, Esq.
R. Hugh Stephens, Esq.
Lisa P. Neff, Esq.