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| The NNSA is responsible for managing national nuclear security and currently supports eight major programs and areas of responsibility. Learn More |
The mission of the NNSA’s Y-12 Site Office is to ensure the safe, secure and cost-effective operation of the Y-12 National Security Complex, a major U.S. Department of Energy facility located in Oak Ridge, Tennessee. |
View the latest press releases and other documents that highlight some of our current activity in areas such as nuclear nonproliferation and defense programs. Learn More |
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Y-12 was constructed as part of the World War II Manhattan Project. The first mission was the electromagnetic separation of uranium-235. After World War II, Y-12 became a high-precision manufacturing facility and played a major role in the production of components for modern thermonuclear weapons. Since the end of the Cold War, Y-12's primary mission has supported NNSA's scientific-based stockpile stewardship mission through quality evaluation and the remanufacture of the nuclear weapons components as part of long term nuclear weapons life extension programs. Learn More |
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