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US DOE ARCHIVE Nuclear Events at Nevada Test Site Shrew 9/l6/6l low yield, underground 3, 5, 7 Chena 10/10/61 low yield, underground (tunnel) 3, 8 Mink 10/29/61 low yield, underground . 3, 5, 8 Mad ■ 12/13/61 430 tons, underground 3, 5, 8 Ringtail 12/17/61 low yield, underground 3, 5, 7 Feather 12/22/61 low yield, underground (tunnel) 3, 8 Dormouse 1/30/62 low yield, underground 3, 5, 7 Codsaw 2/19/62 low yield, underground 2, 7 Platypus 2/24/62 low yield, underground 3, 7 • Pampas ■ 3/1/62 low yield, underground (UK device) 3, 8 Danny Boy 3/5/62 430 tons, underground (cratering 4, 6 Ermine low yield, underground 2, 7
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Event Date Type of Event Release Categories Kognose 3/15/62 low yield, underground 1, 8 Chinchilla II 3/31/62 low yield, underground 2, 8 Dormouse Prime 4/5/62 ■ 9.7 KT, underground 1, 8 Passaic 4/6/62 low yield, underground 1, 8 Hudson 4/12/62 low yield, underground 2, 8 Dead 4/21/62 low yield, underground ' 1, 8 Black 4/27/62 low yield, underground . l, 7 Paca . 5/7/62 low yield, underground 1, 8 Eel 5/19/62 ' low yield, underground 4, 5, 7 • White ’ 5/25/62 low yield, underground ' 1, 7 * Raccoon 6/1/62 low yield, underground 1, 7 Packrat - 6/6/62 low yield, underground ' 2, 8 .Des Moines 6/13/62 low yield, underground (tunnel) • 6, 7 Daman I ■ 6/21/62 low yield, underground ' 2, 8 Marshmallow 6/28/62 low yield, underground (tunnel) 3, 7 Sacramento 6/30/62 low yield, underground 1, 7 Sedan . 7/6/62 . Plowshare cratering experiment* 4, 6, 7 Little ‘Feller II 7/7/62 low yield, slightly aboveground 3, 6** *100 KT total yield, with less than 30 KT fission, 635 feet underground, **Although a cloud was formed, the U. S. Public Health Service off-site monitoring net work did not identify any radioactivity in the off-site area, as defined in category 3, which could be attributed to this event. ' . •
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Event Date - fype of Event Release .Categories Johnny Boy 7/11/62 500 tons, underground 4, 6 Merrimac 7/13/62 low yield, underground 3, 5, 8 Small Boy - 7/14/62 low yield, slightly aboveground 4, 6 Little Feller I ' 7/17/62 low yield, slightly aboveground 3,6* Wichita 7/27/62 low yield, underground 3, 5, 7 Bobac 8/24/62 low yield, underground l, 8 York 8/24/62 low yield, underground l, 8 Hydrax 9/14/62 low yield, .underground ' 1, 8 Categories of Release of Radioactivity 1. No radiation levels detected atove Background on 'or off the Nevada Test Site free radioactivity released hy this detonation. 2. Radiation levels detected near surface zero above normal background from radio- ' activity released by this detonation. No other radiation levels detected on or off the Nevada Test Site from radioactivity released by this detonation. i 3. Radiation-detected on-site from radioactivity released by this detonation. No radiation levels above background detected off the Nevada- Test Site in populated , areas from radioactivity released by this detonation. ("On-site" as used above includes the Las Vegas Bombing and Gunnery Range.) _ 4. Some radioactivity detected in off-site areas. For details see subsequent 5- Event released small visible quantities of radioactive steam and/or gases. 6. ;A persistent cloud was produced containing appreciable quantities of radioactivity associated with particulates. ' 7. No radiation detected at the work, site or any other location from releases of gaseous radioactivity during post-shot drilling or tunnel re-entry operations. 8.. Some radiation detected in the area surrounding surface zero from gaseous radio activity released during post-shot drilling or tunnel re-entry operations. No ■ radioactivity detected off the Nevada Test Site from post-shot^operations. *A1though a cloud was formed, the U. S. Public Health Service off-site monitoring net work did not identify any radioactivity in the off-site area, as defined in category 3, which could be attributed to this event. '
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