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Key Visit Locations: The Y-12 Protected Area encompasses approximately 150 acres and includes large process buildings constructed during the Manhattan Project. It includes enriched uranium processing and storage operations, lithium and special material processing, and related operations.

A fire at a uranium processing facility in the Y-12 National Security Complex led to the evacuation of hundreds of workers on the morning of Feb. 22, but officials said the fire was quickly contained and no radioactive material was released.

Y-12 was the World War II code name for the electromagnetic isotope separation plant at Oak Ridge. The plant began operations in 1943 using an electromagnetic process developed at the University of California, Berkeley.

Y‑12 helps ensure a safe and effective U.S. nuclear weapons deterrent. We also retrieve and store nuclear materials, fuel the nation's naval reactors, and perform complementary work for other government and private-sector entities.

Y-12 is the World War II code name for the electromagnetic isotope separation plant producing enriched uranium at the Clinton Engineer Works in Oak Ridge, Tennessee, as part of the Manhattan Project.

The Y‑12 National Security Complex is a premier manufacturing facility dedicated to making our nation and the world a safer place and plays a vital role in the Department of Energy's Nuclear Security Enterprise. Y‑12 helps ensure a safe and effective U.S. nuclear weapons deterrent.