Operation Upshot-Knothole

Operation Upshot-Knothole
Operation Upshot-Knothole
Upshot-Knothole GRABLE.jpg
The Grable test, including the artillery piece used to fire the warhead.
Information
Country United States
Test site Nevada Test Site
Period March-June 1953
Number of tests 11
Test type Atmospheric tests
Device type Fission
Max. yield 61 kilotons of TNT (260 TJ)
Navigation
Previous test Operation Ivy
Next test Operation Castle

Operation Upshot-Knothole was a series of eleven nuclear test shots conducted in 1953 at the Nevada Test Site.

Over twenty-one thousand soldiers took part in the ground exercise Desert Rock V in conjunction with the Grable shot. Grable was a 280mm shell fired from the “Atomic Cannon” and was viewed by a number of high-ranking military officials.

Operation Upshot-Knothole followed Operation Ivy and preceded Operation Castle. The test series was notable as containing the first time an atomic artillery shell was fired (Shot Grable), the first two shots (both fizzles) by University of California Radiation Laboratory—Livermore (now Lawrence Livermore National Laboratory), and for testing out some of the thermonuclear components that would be used for the massive thermonuclear series of Operation Castle.

The individual shots were:

Upshot-Knothole test blasts
Test name Date Location Yield Note
Annie 17 March 1953 Nevada Test Site 16 kilotons  
Nancy 24 March 1953 Nevada Test Site 24 kilotons  
Ruth 31 March 1953 Nevada Test Site 0.2 kilotons First UCRL device, uranium hydride device, fizzle
Dixie 6 April 1953 Nevada Test Site 11 kilotons  
Ray 11 April 1953 Nevada Test Site 0.2 kilotons Second UCRL device, uranium hydride device, fizzle
Badger 18 April 1953 Nevada Test Site 23 kilotons  
Simon 25 April 1953 Nevada Test Site 43 kilotons  
Encore 8 May, 1953 Nevada Test Site 27 kilotons  
Harry 19 May 1953 Nevada Test Site 32 kilotons Extreme contamination of downwinders
Grable 25 May 1953 Nevada Test Site 15 kilotons nuclear artillery, gun-type fission weapon
Climax 4 June 1953 Nevada Test Site 61 kilotons  

External links


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