- Announced United States Nuclear Tests -- By Date Event Name me Date (GCT) Location Type _°. Purpose... ].. Yield Range. Raa Operation Storax -- Continued 7 Harkee 05/17/63 NTS Shaft WeaponsRelated Low Tejon 05/17/63 NTS Shaft WeaponsRelated Low Stones 05/22/63 NTS Shaft WeaponsRelated Intermediate Clean Slate| Operation Roller Coaster Pu dispersal Radioactivity detected off site 05/25/63 Bombing Range Surface Storage-Transp. Zero Pleasant Accidental release of radioactivity detected onsite only . 05/29/63 NTS Shaft Weapons Related Low Clean State II Operation Roller Coaster 05/31/63 Bombing Range Surface Storage-Transp. Zero Yuba 06/05/63 NTS Tunnel WeaponsRelated Low Hutia 06/06/63 NTS Shaft WeaponsRelated Low Apshapa Accidental release of radioactivity 06/06/63 NTS Shaft WeaponsRelated Low Clean Slate II) Operation Roller Coaster 06/09/63 Bombing Range Surface Storage-Transp. Zero Mataco 06/14/63 NTS Shaft WeaponsRelated Low Kennebec 06/25/63 NTS Shaft WeaponsRelated Low Pu dispersal Radioactivity not detected off site Accidental release of radioactivity detected on site only Operational release of radioactivity detected off site detected on site only Pu dispersal Radioactivity detected off site Accidental release of radioactivity detected onsite only -23- 7