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Upshot-Knothole Grable
Upshot-Knothole
Grable
was a
nuclear weapons test
conducted by the
United States
as part of
Operation Upshot-Knothole
. Detonation of the associated
nuclear weapon
occurred 19 seconds after its deployment at 8:30am
PDT
(1530
UTC
) on May 25, 1953, in Area 5 of the
Nevada Test Site
. The codename
Grable
was chosen because the letter
Grable
is phonetic for G, as in "gun", since the warhead was a
gun-type fission weapon
. As a shell, or
artillery-fired atomic projectile
(AFAP), the device was the first of its kind. The test remains the only nuclear artillery shell ever actually fired in the
U.S. nuclear weapons test program
.
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