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Gaseous Diffusion Plants

Depleted UF6 Cylinder Storage Yard
Depleted UF6 Cylinder Storage Yard at a Gaseous Diffusion Plant Site

Most of the depleted UF6 accumulated since the 1940s is stored in the locations where it was produced as a product of the gaseous diffusion enrichment process.

These locations are the gaseous diffusion plants near Paducah, Kentucky, and Portsmouth, Ohio, and at the K-25 Site at the Oak Ridge Reservation in Oak Ridge, Tennessee.

On July 1, 1993, responsibility for uranium enrichment operations at the Portsmouth and Paducah facilities was transferred from DOE to the United States Enrichment Corporation. Gaseous diffusion plant operations at the Oak Ridge facility ceased in 1985. The scope of the Programmatic Environmental Impact Statement includes the quantity of depleted UF6 (560,000 metric tons) produced before July 1, 1993 as well as depleted UF6 generated by USED that has been or will be transferred to DOE.

Storage Cylinders
Depleted UF6 Storage Cylinders


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