Operation Hardtack I
Appearance
Operation Hardtack I | |
---|---|
Information | |
Country | United States |
Test site | Pacific Proving Grounds |
Period | April - October 1958 |
Number of tests | 35 |
Max. yield | 9.3 Mt |
Test chronology | |
Operation Hardtack I was a series of 35 nuclear tests conducted by the United States in 1958 in the Pacific Ocean.
Test Blasts
Test Name | Date | Location | Yield | Note | Image |
---|---|---|---|---|---|
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 11°33′09″N 162°20′50″E / 11.55250°N 162.34722°E, crater has been filled with contaminated soil and debris and covered with concrete cap called "Cactus Dome".[1] | |
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
Notes
References
- Chuck Hansen, U. S. Nuclear Weapons: The Secret History (Arlington: AeroFax, 1988) ISBN 0517567407
- The Nuclear Weapons Archive
- "United States Nuclear Tests, July 1945 through September 1992 (DOE/NV-209)" (pdf). U.S. Department of Energy Nevada Operations Office. 2000.
External links
- Operation HARDTACK Military Effects Studies Part I: Basic Effects Structures and Materiel (1958), Department of Defense documentary film, Lookout Mountain Laboratory USAF.
- Operation HARDTACK Military Effects Studies Part II: Underwater Tests (1958), Department of Defense documentary film, Lookout Mountain Laboratory USAF.
- Operation HARDTACK Military Effects Studies Part III: High Altitude Tests (1958), Department of Defense documentary film, Lookout Mountain Laboratory USAF.