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

The United States's Grommet nuclear test series was a group of 34 nuclear tests conducted in 1971–1972. These tests followed the Operation Emery series and preceded the Operation Toggle series.

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