Operation Grommet

Operation Grommet
Grommet Cannikin, 4.8Mt. Largest U.S. Underground nuclear test.
Information
CountryUnited States
Test site
  • Amchitka Island, Alaska
  • NTS Area 12, Rainier Mesa
  • NTS Area 16, Shoshone Mountain
  • NTS Areas 5, 11, Frenchman Flat
  • NTS Areas 1–4, 6–10, Yucca Flat
Period1971–1972
Number of tests34
Test typeunderground shaft, tunnel
Max. yield4.8 megatonnes of TNT (20 PJ)
Test series chronology
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The United States's Grommet nuclear test series[1] was a group of 34 nuclear tests conducted in 1971–1972. These tests[note 1] followed the Operation Emery series and preceded the Operation Toggle series.

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