|Used by||United States|
|Designer||Lawrence Livermore National Laboratory|
|Designed||Mod 0: February 1982 |
Mod 1: November 1986 to July 1988, March 2019 to 2030
|Produced||Mod 0: July 1986 to December 1988 |
Mod 1: 2030 onwards
|Mass||400 to 600 pounds (180 to 270 kg)|
|Blast yield||300 kt (W87-0) |
475 kt (W87-1)
The W87 is an American
Design of the W87 (now called the W87 Mod 0 or W87-0) started in February 1982 at Lawrence Livermore National Laboratory and production of the warhead began in July 1986 and ended in December 1988. Its design is reportedly somewhat similar to the W88, though that warhead was designed at Los Alamos National Laboratory. The weapons are part of a National Nuclear Security Administration nuclear weapons lifecycle program.
The W87 design includes all modern safety features, including the
The exact dimensions of the W87 are classified, but it fits inside the Mk. 21
W87 mod 1
In addition to the higher yield upgrade option described above, a specific variant W87 mod 1 (W87-1) entered Phase 3 development engineering and was assigned its type designation in November 1988.
In 2019, the W87 mod 1 was selected to replace the W78 warhead deployed on all Minuteman III missiles not currently carrying the W87 mod 0. The new warhead will not be deployed onto Minuteman III, but instead be deployed on Minuteman III's replacement ICBM system LGM-35A Sentinel (formerly Ground Based Strategic Deterrent or GBSD). It is not clear if the new W87 mod 1 program is a continuation of the previous W87 mod 1 program, or if it uses any of the physics package developed in the previous W87 mod 1 program.
Information released by the Department of Energy (DoE) on the program states that it "has a similar primary design to the W87-0", which could be evidence that it is like the previous W87 mod 1 program in that it has a different or modified secondary to produce a higher yield. The DoE states that the weapon is based on previously tested nuclear components, with a primary stage containing insensitive high explosives and advanced safety features, but that the weapon does not provide any new military capabilities.
Phase 6.2 Feasibility Study was halted in 2014 before being restarted in 2019. Phase 6.3 Development Engineering is planned to begin July 2022, with 6.4 Production Engineering planned for mid 2026 and 6.5 Initial Production planned for 2030.
It is planned for the Sentinel missile to deploy in 2028, with W87-0 warheads initially being fitted to the system and W87-1 warheads being fitted from 2030 onward. This affords the air force a small amount of flexibility if the W87-1 is delayed.
- Nuclear weapons labs (status report), University of California, 1989, archived from the original on 2006-05-18, retrieved 2006-04-15.
- "Fact Sheet: W87-1 Modification Program" (PDF). National Nuclear Security Administration. March 2019. Archived (PDF) from the original on 2019-12-31. Retrieved 2020-03-07.
- Sublette, Carey (1 September 2001). "The W87 Warhead". Nuclear Weapon Archive. Retrieved 14 April 2023.
- "W87-1 Modification Program" (PDF). March 2019. Archived (PDF) from the original on 2019-12-31. Retrieved 2020-03-08.
- National Nuclear Security Administration (1 Feb 2022). W87-1 MODIFICATION PROGRAM (PDF) (Report). Archived (PDF) from the original on 30 March 2022. Retrieved 30 March 2022.
- Frank G. Klotz, Alexandra T. Evans (2022). Modernizing the U.S. Nuclear Triad: The Rationale for a New Intercontinental Ballistic Missile (PDF) (Report). RAND. p. 21. Archived (PDF) from the original on 6 February 2022. Retrieved 30 March 2022.