The W91 was an American thermonuclear warhead intended for use on the SRAM-T variant of the
AGM-131 SRAM IIair to ground missile.
What was to become the W91 design entered into a Phase 2 design competition between the various nuclear weapons laboratories in November 1988. Further development details are somewhat unclear, but a
Los Alamos National Laboratorydesign won the competition.
The design that emerged was a 310 pound, selectable 10 or 100
kilotonyield nuclear weapon. Other physical characteristics have not been well described in public documents. The design has been described as being named the "New Mexico 1" code name, and as using TATBbased insensitive plastic bonded explosiveand a fire resistant nuclear fissile material core or pit.
The design was cancelled in September 1991 along with the SRAM T missile, prior to production of any units, though some test devices may have been manufactured.
Notably, the W91 was the last new US nuclear weapon design to reach the point of receiving a model number designation (entering Phase 3 development status).
List of nuclear weapons
* [http://scipp.ucsc.edu/~haber/UC_CORP/jendrese.htm University of California 1989 nuclear weapons labs status report]
* [http://nuclearweaponarchive.org/Usa/Weapons/Allbombs.html Allbombs.html] at the Nuclear Weapon Archive at [http://nuclearweaponarchive.org nuclearweaponarchive.org]
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