oe “Date (GCT) “Yield Range Serpa 12/17/80 NTS Shaft Joint US-UK 20 to 150 kt Seyval 11/12/82 NTS Shaft WeaponsRelated Less than 20 kt Shaper 03/23/70 NTS Shaft WeaponsRelated 20 to 200 kt Shasta 08/18/57 NTS Tower WeaponsRelated 17 kt Sheepshead 09/26/79 NTS Shaft WeaponsRelated 20 to 150 kt Shoal 10/26/63 Falion Shaft Vela Uniform 12 kt Shrew Accidental release of radioactivity detected onsite only 09/16/61 NTS Shaft WeaponsRelated Low Shuffle 04/18/68 NTS Shaft Weapons Related 20 to 200 kt Simms Excavation device development 11/05/66 NTS Shaft Plowshare Less than 20 kt Simon 04/25/53 NTS Tower WeaponsRelated 43 kt Sled 08/29/68 NTS Shaft WeaponsRelated 20 to 200 kt Smatt Boy Slightly above ground DoD Event--Operation Sunbeam Release of radioactivity detected off site 07/14/62 NTS Tower WeaponsEffects Low Smoky 08/31/57 NTS Tower Weapons Related 44 kt Snubber Accidental release of radioactivity detected off site 04/21/70 NTS Shaft WeaponsEffects Less than 20 kt Socorro 10/22/58 NTS Balloon WeaponsRelated 6 kt Spider 08/14/69 NTS Shaft WeaponsRelated Less than 20 kt St. Lawrence 11/09/62 NTS Shaft WeaponsRelated Low Nuclear test detection-research experiment near Fallon, Nevada Accidental release of radioactivity detected on site only -96-