Announced United States Nuclear Tests -- By Date ~~ Event Name... Date (GCT) |... Location. Type Operation Fulcrum -- Continued “Purpose|. Yield Range:. Scantling 08/19/77 NTS Shaft WeaponsRelated 20 to 150 kt Ebbtide 09/15/77 NTS Shaft WeaponsRelated Less than 20 kt Coulommiers 09/27/77 NTS Shaft WeaponsRelated 20 to 150 kt Bobstay 10/26/77 NTS Shaft WeaponsRelated Less than 20 kt Hybla Gold DoD Event 11/01/77 NTS Tunnel Weapons Effects Less than 20 kt Sandreef 11/09/77 NTS Shaft WeaponsRelated 20 to 150 kt Seamount 11/17/77 NTS Shaft WeaponsRelated Less than 20 kt Farallones 12/14/77 NTS Shaft Weapons Related 20 to 150 kt Campos 02/13/78 NTS Shaft Weapons Related Less than 20 kt Reblochon 02/23/78 NTS Shaft WeaponsRelated 20 to 150 kt Iceberg 03/23/78 NTS Shaft WeaponsRelated 20 to 150 kt Backbeach 04/11/78 NTS Shaft Weapons Related 20 to 150 kt Fondutta 04/11/78 NTS Shaft Joint US-UK 20 to 150 kt Transom No nuclear yield 05/10/78 NTS Shaft Weapons Related Zero Lowball 07/12/78 NTS Shaft WeaponsRelated 20 to 150 kt Panir 08/31/78 NTS Shaft WeaponsRelated 20 to 150 kt Diablo Hawk 03/13/78 NTS Tunnel WeaponsEffects Less than 20 kt Draughts 09/27/78 NTS Shaft WeaponsRelated 20 to 150 kt Rummy 03/27/78 NTS Shaft WeaponsRelated 20 to 150 kt Device was destroyed by Hearts detonation on 09/06/79 DoD Event -44-