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View highlights by decade since Y‑12's initial planning and wartime mission starting in 1942 through its current missions today. Click a decade below to show its highlights. Click again to hide.

On February 18, 1943, in the midst of the second World War, ground was broken in rural East Tennessee for the first production building at the Y‑12 Electromagnetic Separation Plant. The plant’s job was to make enough enriched uranium for a new kind of bomb, an atomic bomb.

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.

Y-12's core mission is to ensure a safe, secure, and reliable U.S. nuclear deterrent, which is essential to national security. Global Security. We train nuclear industry professionals, emergency responders and security forces from around the world. Naval Reactors

Patriotic, safety-first, and detail-minded, the team at Y-12 works in unison to maintain the U.S. nuclear stockpile, reduce global threats, and ensure that the U.S. Navy has the nuclear fuel it needs to meet its mission.

First and foremost, the Y‑12 National Security Complex resides in an especially beautiful part of our state in a valley between the Great Smoky Mountains and the Cumberland Mountains. Y‑12 is located in the City of Oak Ridge, just minutes away from …

The Y-12 National Security Complex in Oak Ridge, Tennessee, is one of six production facilities in the National Nuclear Security Administration’s (NNSA’s) Nuclear Security Enterprise. Y-12’s unique emphasis is the processing and storage of uranium and development of technologies associated with those activities. Decades

The National Nuclear Security Administration is constructing a modern Uranium Processing Facility (UPF) to support key missions of the Y-12 National Security Complex and ensure the long-term viability, safety and security of enriched uranium capabilities in the United States.

The 1980s was a period of an enormously heavy workload and around-the-clock activities at Y 12. Some 9,000 people worked feverishly to manufacture as many nuclear weapon secondaries as possible, knowing the pressure was on Y 12 to lead the way toward winning the Cold War. And that was the case