Operation Hardtack I

Operation Hardtack I

Hardtack Oak
Information
Country  United States
Test site Pacific Proving Grounds
Period April - October 1958
Number of tests 35
Max. yield 9.3 Mt
Navigation
Previous test Project 58A
Next test Operation Argus

Operation Hardtack I was a series of 35 nuclear tests conducted by the United States in 1958 in the Pacific Ocean.[1]

Operation Newsreel was a series of three high-altitude nuclear tests conducted as part of Hardtack I. The individual tests in the series were Orange‎, Teak‎ and Yucca‎.[1]

Contents

Test Blasts

Hardtack I Test Blasts
Test Name Date Location Yield Note
Yucca 28 April, 1958 Enewetak Atoll 1.7 kilotons 85nm NE of Enewetak, high-altitude balloon test at 86,000 feet for ABM development
Cactus 5 May, 1958 Enewetak 18 kilotons Test of Mark-43 Primary , crater has been filled with contaminated soil and debris and covered with concrete cap called "Cactus Dome".[2]
Fir 11 May, 1958 Bikini Atoll 1.36 megatons 93.4 % fusion yield
Butternut 11 May, 1958 Enewetak 81 kilotons TX-46 test, primary only
Koa 12 May, 1958 Enewetak 1.37 megatons XW-35 ICBM warhead test
Wahoo 16 May, 1958 Enewetak 9 kilotons Deep underwater test (3200 ft.)
Holly 20 May, 1958 Enewetak 5.9 kilotons
Nutmeg 21 May, 1958 Bikini Atoll 25.1 kilotons
Yellowwood 26 May, 1958 Enewetak 330 kilotons Fizzled, TX-46 test, 2.5 megaton yield predicted
Magnolia 26 May, 1958 Enewetak 57 kilotons
Tobacco 30 May, 1958 Enewetak 11.6 kilotons 2nd stage failed to ignite
Sycamore 31 May, 1958 Bikini Atoll 92 kilotons Fizzle, 5 megaton yield predicted
Rose 2 June, 1958 Enewetak 15 kilotons Fizzle, 125 kiloton yield predicted
Umbrella 8 June, 1958 Enewetak 8 kilotons Shallow depth underwater shot (150 ft.)
Maple 10 June, 1958 Bikini Atoll 213 kilotons 89 % fission yield predicted
Aspen 14 June, 1958 Bikini Atoll 319 kilotons Fired in Castle Bravo crater
Walnut 14 June, 1958 Enewetak 1.45 megatons
Linden 18 June, 1958 Enewetak 11 kilotons
Redwood 27 June, 1958 Bikini Atoll 412 kilotons
Elder 27 June, 1958 Enewetak 880 kilotons
Oak 28 June, 1958 Enewetak 8.9 megatons TX-46 redesigned full-yield test, successful.
Hickory 30 June, 1958 Bikini Atoll 14 kilotons
Sequoia 1 July, 1958 Enewetak 5.2 kilotons
Cedar 2 July, 1958 Bikini Atoll 220 kilotons
Dogwood 5 July, 1958 Enewetak 397 kilotons
Poplar 12 July, 1958 Bikini Atoll 9.3 megatons Highest test of the Dominic Series, 5th largest U.S. test overall
Scaevola 14 July, 1958 Enewetak zero Zero yield safety test
Pisonia 17 July, 1958 Enewetak 255 kilotons
Juniper 22 July, 1958 Bikini Atoll 65 kilotons Final test at Bikini Atoll
Olive 22 July, 1958 Enewetak 202 kilotons
Pine 26 July, 1958 Enewetak 2 megatons "Clean" version of the three stage Mark-41 design, yield well below the 4-6 megaton prediction
Teak 1 Aug., 1958 Johnston Atoll 3.8 megatons ABM effects test, launched by the Redstone ballistic missile, with a 252,000 foot burst height. Miscalculation resulted in detonation directly above launch site.
Quince 6 Aug., 1958 Enewetak zero Fizzle
Orange 12 Aug., 1958 Johnston Atoll 3.8 megatons ABM effects test, launched on the Redstone ballistic missile, 141,000 foot burst height
Fig 18 Aug., 1958 Enewetak 0.02 kilotons Final test at Enewetak

See also

References

  1. ^ a b U.S. Department of Energy / Nevada Operations Office, United States Nuclear Tests - July 1945 through September 1992, December 2000, DOE/NV-209 Rev 15
  2. ^ http://atlasobscura.com/place/cactus-dome

Bibliography

External links

Nuclear weapons tests of the United States
Operations
Testing areas
Other
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