Learn more about Nuclear Stockpile
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March 5, 2026One of NNSA’s core missions is to ensure the U.S. maintains a safe, secure, and reliable nuclear stockpile.National Nuclear Security Administration
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Press ReleasesJanuary 23, 2026NNSA achieved a significant milestone by completing a record number of 13 tritium extractions within nine months, spanning fiscal year (FY) 2025 and 2026. Tritium, an isotope of hydrogen, is a key element in nuclear weapons.National Nuclear Security Administration
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December 16, 2025NNSA has completed the Last Production Unit of the W88 Alteration 370, a multiyear program to modernize the W88 nuclear warhead carried onboard Ohio-class ballistic missile submarines.National Nuclear Security Administration
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Press ReleasesNovember 25, 2025The Department of Energy’s National Nuclear Security Administration (DOE/NNSA) has approved Critical Decision-4, signifying the completion of the UPF PSF Subproject at the Y-12 National Security Complex.National Nuclear Security Administration
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September 30, 2025NNSA competitively awarded a contract to BWXT Ordnance Tennessee, a subsidiary of BWX Technologies, Inc., for the licensing, design, and operation of a High Purity Depleted Uranium production capability at the contractor’s site in Jonesborough, Tennessee.National Nuclear Security Administration
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September 25, 2025U.S. Deputy Secretary of Energy James P. Danly participated in the diamond-stamping of the First Production Unit (FPU) of a canned subassembly (CSA) for the W80-4 Life Extension Program at the NNSA’s Y-12 National Security Complex in Oak Ridge, Tennessee.National Nuclear Security Administration
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May 19, 2025Major nuclear stockpile milestone assembled almost a year ahead of target date through streamlined productionNational Nuclear Security Administration
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Press ReleasesJanuary 7, 2025NNSA completed the Last Production Unit (LPU) of the B61-12 Life Extension Program (LEP). The B61-12 is the latest modification to the B61 family of gravity bombs, which are deployed from U.S. Air Force and North Atlantic Treaty Organization bases.National Nuclear Security Administration
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ArticleDecember 20, 2024NNSA releases Request for Information for industry input on an AC100 Deployment DemonstrationNational Nuclear Security Administration
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December 10, 2024The Department of Energy’s National Nuclear Security Administration (NNSA) and Lawrence Livermore National Laboratory (LLNL) announced the official verification of El Capitan as the world’s most powerful supercomputer.National Nuclear Security Administration