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The code name for the facilities at Oak Ridge, Tennessee that were created as part of the Manhattan Project in 1943. The three primary facilities were code-named Y-12, X-10 (later to become Oak Ridge National Laboratory), and K-25. K-25 was a gaseous diffusion plant designed to separate U-235 from U-238. Y-12 was dedicated to the electromagnetic separation of U-235. X-10 was a demonstration plant for the process to produce plutonium from uranium by nuclear bombardment.