W84

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W84 nuclear warhead
W84 warhead 2.jpg
W84 warhead, serial number 001.
Type Nuclear weapon
Place of origin United States
Production history
Designer Lawrence Livermore National Laboratory
DesignedSeptember 1978 to June 1983
ProducedJune 1983
No. builtDisputed; 350 or 530 warheads
Specifications
Mass388 lb (176 kg)
Length34 inches (86 cm)
Diameter13 in (33 cm)

Blast yield0.2 to 150 kilotonnes of TNT (0.84 to 627.60 TJ)

The W84 is an American thermonuclear warhead initially designed for use on the BGM-109G Gryphon Ground Launched Cruise Missile (GLCM).

Contents

History

The weapon was designed by Lawrence Livermore National Laboratory beginning in September 1978 for the Ground Launched Cruise Missile program. Production engineering began in December 1980 and first production began in June 1983 with full-scale production starting in September 1983. [1] Though the exact number is disputed, either 350 or 530 warheads were produced. [1] [2]

The warhead suffered post-deployment design issues after the weapon produced an unexpectedly low yield in a simulated ageing test. This issue was corrected without redesign of the nuclear explosive sub-assembly. One test of the weapon was 2 August 1984 shot Fusileer Correo at a depth of 1,099 feet (335 m), producing a yield of less than 20 kilotonnes of TNT (84 TJ). [1]

With the signing of the Intermediate-Range Nuclear Forces Treaty in 1987, the GLCMs that carried the W84 were destroyed and the warheads put into the inactive reserve stockpile. These warheads have been used to study the effects of long-term ageing on TATB and polymer-bonded explosives. [2]

The W84 was briefly considered alongside the B61 Mod 12 for the Long-Ranged Stand Off Missile (LRSO) program, but a new modification of the W80, the W80 Mod 4 was chosen instead as neither system met the dimension and weight requirements for the program. [3]

Design

The W84 is a derivative of the B61 nuclear bomb design and is a close relative of the W80 warhead used on the AGM-86 ALCM, AGM-129 ACM, and BGM-109 Tomahawk SLCM cruise missiles. It is a two-stage radiation implosion warhead with a variable yield ranging from 0.2 kiloton up to 150 kilotons. The W84 was designed at Lawrence Livermore National Laboratory while the B61 nuclear bomb the design is thought to be based on originated at Los Alamos National Laboratory. [1]

The warhead is 13 inches (33 cm) in diameter and 34 inches (86 cm) long which is slightly wider and longer than the W80 warhead used on other cruise missiles from this era. It weighs 388 pounds (176 kg), almost 100 pounds (45 kg) pounds heavier than the W80. [4] The warhead contains TATB-based LX-17 polymer bonded explosive in its primary stage, which is an insensitive high-explosive (IHE) designed to reduce the chance of detonation in an accident. [1] [2] Other explosive present in the warhead include ultra-fine powdered TATB (UF-TATB) and LX-16, [2] a PETN-based conventional polymer-bonded high explosive. [5]

The W84 has all eight of the modern types of nuclear weapon safety features identified as desirable in nuclear weapon safety studies. It is the only US nuclear warhead which has all eight features. These include: insensitive high-explosives, a fire resistant pit, Enhanced Nuclear Detonation Safety (ENDS/EEI) with detonator stronglinks, Command Disable, and the most advanced Cat G Permissive Action Link (PAL). [6] [7]

A 2001 declassified report states that the W84 does not use a Canned Subassembly (CSA) and that the weapon's secondary is not sealed. [8]

See also

Related Research Articles

Lawrence Livermore National Laboratory (LLNL) is a federally funded research and development center in Livermore, California, United States. Originally established in 1952, the laboratory now is sponsored by the United States Department of Energy and administered by Lawrence Livermore National Security, LLC.

Polymer-bonded explosives, also called PBX or plastic-bonded explosives, are explosive materials in which explosive powder is bound together in a matrix using small quantities of a synthetic polymer. PBXs are normally used for explosive materials that are not easily melted into a casting, or are otherwise difficult to form.

<span class="mw-page-title-main">B61 nuclear bomb</span> Nuclear bomb

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<span class="mw-page-title-main">W80 (nuclear warhead)</span> Nuclear weapon

The W80 is a low to intermediate yield two-stage thermonuclear warhead deployed by the U.S. enduring stockpile with a variable yield ("dial-a-yield") of 5 or 150 kilotonnes of TNT.

<span class="mw-page-title-main">W81</span>

The W81 was a planned American warhead to be mounted on the SM-2 surface-to-air missile used by the United States Navy. The W81 was believed to be derived from the B61 nuclear bomb which forms the backbone of the current US nuclear gravity bomb arsenal and from which the W80 cruise missile warhead is derived. The weapon was being designed at Los Alamos National Laboratory.

<span class="mw-page-title-main">W78</span> American thermonuclear warhead

The W78 is an American thermonuclear warhead with an estimated yield of 335–350 kilotonnes of TNT (1,400–1,460 TJ), deployed on the LGM-30G Minuteman III intercontinental ballistic missile (ICBM) and housed in the Mark 12A reentry vehicle. Minuteman III initially carried the older W62 warhead with a yield of 170 kilotonnes of TNT (710 TJ), but starting in December 1979 and ending in February 1982, some W62 were replaced with the W78. It is publicly estimated that 1083 warheads were manufactured.

<span class="mw-page-title-main">W87</span> American thermonuclear missile warhead

The W87 is an American thermonuclear missile warhead formerly deployed on the LGM-118A Peacekeeper ("MX") ICBM. 50 MX missiles were built, each carrying up to 10 W87 warheads in multiple independently targetable reentry vehicles (MIRV), and were deployed from 1986 to 2005. Starting in 2007, 250 of the W87 warheads from retired Peacekeeper missiles were retrofitted onto much older Minuteman III missiles, with one warhead per missile.

<span class="mw-page-title-main">W68</span> Nuclear weapon

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<span class="mw-page-title-main">W56</span> American thermonuclear warhead designed in the late 1950s/early 1960s

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<span class="mw-page-title-main">W91</span>

The W91 was an American thermonuclear warhead intended for use on the SRAM-T variant of the AGM-131 SRAM II air to ground missile.

<span class="mw-page-title-main">W89</span>

The W89 was an American thermonuclear warhead design intended for use on the AGM-131 SRAM II air to ground nuclear missile and the UUM-125 Sea Lance anti-submarine missile.

<span class="mw-page-title-main">W86</span> Nuclear weapon

The W86 was an American earth-penetrating nuclear warhead, intended for use on the Pershing II intermediate-range ballistic missile (IRBM). The W86 design was canceled in September 1980 when the Pershing II missile mission shifted from destroying hardened targets to targeting soft targets at greater range. The W85 warhead, which had been developed in parallel with the W86, was used for all production Pershing II missiles.

<span class="mw-page-title-main">W73 (nuclear warhead)</span>

The W73 was a planned nuclear warhead for the AGM-53 Condor air to surface missile and designed by Los Alamos Scientific Laboratory. The W73 warhead was cancelled in 1970 in favor of a purely conventional warhead for Condor. Condor was approved for production in 1975 with a expected production run of 250 missiles, but was cancelled in early 1976 due to high cost.

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References

  1. 1 2 3 4 5 Sublette, Carey (1 September 2001). "The W-84 Warhead". Nuclear Weapon Archive. Retrieved 10 September 2021.
  2. 1 2 3 4 "W84". Global Security. 24 July 2011. Archived from the original on 24 September 2021. Retrieved 10 September 2021.
  3. Action Needed to Address the W80-4 Warhead Program's Schedule Constraints (PDF) (Report). United States Government Accountability Office. July 2020. p. 31. GAO-20-409. Archived (PDF) from the original on 17 July 2021. Retrieved 6 November 2021.
  4. Sublette, Carey (12 June 2020). "Complete List of All U.S. Nuclear Weapons". Nuclear Weapon Archive. Retrieved 10 September 2021.
  5. Foltz, M F; Reyes, P; Foster, P A (24 August 1999). CRT compatibility evaluation of LX-16 and Halthane 73-18 (Report). Lawrence Livermore National Laboratory. Archived from the original on 10 September 2021. Retrieved 6 November 2021.
  6. "Scrapping the Safe Nuke?". FAS Strategic Security Blog. 6 October 2010. Archived from the original on 9 October 2010. Retrieved 13 October 2010.
  7. Sandia Weapon Review: Nuclear Weapon Characteristics Handbook (PDF) (Report). Sandia National Labs. September 1990. p. 78. SAND90-1238.
  8. Robert B Bonner; Stephan E Lott; Howard H Woo (January 2001). Secondary Lifetime Assessment Study (PDF) (Report). Sandia National Labs. p. 10. SAND2001-0063. Archived (PDF) from the original on 6 November 2021. The terms "Canned Sub-Assembly" (CSA) and "secondary" are not synonymous. All CSAs contain secondaries, but not all secondaries are CSAs since some secondaries are not sealed in a "can" (e.g., W84).