The National Nuclear Security Administration said Jan. 18 it finished building the secondary stage for the first war-ready B61-12 nuclear gravity bomb on Dec. 6. The canned subassembly is the uranium-fueled stage of the future gravity bomb, which as part of a 20-year life-extension program will homogenize four previous versions of the venerable weapon. The subassembly is only part of the first warready weapon, which the semiautonomous Department of Energy nuclear-weapon steward says it will build by September 2020. Consolidated Nuclear Security, the Bechtel-led joint venture managing the Y-12 National Security Complex in Oak Ridge, Tenn., finished the B61-12 canned subassembly four months ahead of schedule, the NNSA said in a press release Friday after Nuclear Security & Deterrence Monitor's deadline. Including the one finished in December, Y-12 is scheduled to ship eight canned subassemblies to the Pantex Plant in Amarillo, Texas, by March, the agency said. Consolidated Nuclear Security also manages that facility, where it assembles and disassembles nuclear weapons. The NNSA plans to finish the final B61-12 in 2024. The weapon is designed to fly aboard versions of the B-2, the planned B-21, F-15, F-16, F-35, and the German-made PA-200, according to the Air Force Nuclear Weapons Center. The nonprofit Federation of American Scientists estimates the NNSA will build some 480 B61-12 bombs.
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