High Quality Content by WIKIPEDIA articles! S-50 was a Manhattan Project production facility in Oak Ridge, Tennessee, that was used to enrich uranium by means of liquid thermal diffusion. The thermal diffusion process for uranium isotope separation, which had been developed by U.S. Navy scientists, was not one of the uranium enrichment technologies initially selected for use in the Army-led Manhattan Project. However, in June 1944, after reviewing progress of Philip Abelson's experiments on thermal diffusion at the Philadelphia Navy Yard, a team of Manhattan Project experts recommended that a thermal diffusion plant be built to augment production capacity from the electromagnetic separation process then operating at the Y-12 plant in Oak Ridge.