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Operation Grommet
Information
Country United States
Period 1971–1972
Number of tests 34
Test type underground shaft, tunnel
Max. yield 4.8 megatonnes of TNT (20 PJ)

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.

List of the nuclear tests

See also: List of nuclear weapons tests of the United States
United States' Grommet series tests and detonations
Name Date time (UT) Local time zone Location Elevation + height Delivery
Purpose		 Device Yield Fallout References Notes
Diamond Mine July 1, 1971 14:00:00.04 PST (–8 hrs)
 NTS Area U16a.06 37°00′41″N 116°12′15″W / 37.01148°N 116.20427°W / 37.01148; -116.20427 (Diamond Mine) 1,896 m (6,220 ft) – 266.15 m (873.2 ft) tunnel,
joint verification		 less than 20 kt Designed to test detection of underground nuclear tests; see Vela Uniform.
Miniata July 8, 1971 14:00:00.082 PST (–8 hrs)
 NTS Area U2bu 37°06′37″N 116°03′10″W / 37.11018°N 116.05268°W / 37.11018; -116.05268 (Miniata) 1,247 m (4,091 ft) – 528.83 m (1,735.0 ft) underground shaft,
peaceful research		 83 kt Venting detected, 180 Ci (6,700 GBq) Project Plowshare – device development.
Bracken July 9, 1971 14:00:00.16 PST (–8 hrs)
 NTS Area U10aq 37°09′52″N 116°02′01″W / 37.1644°N 116.0336°W / 37.1644; -116.0336 (Bracken) 1,297 m (4,255 ft) – 304.8 m (1,000 ft) underground shaft,
weapons development		 250 t Venting detected, 1 Ci (37 GBq)
Apodaca July 21, 1971 13:33:00.05 PST (–8 hrs)
 NTS Area U3gs 37°00′52″N 115°59′34″W / 37.01436°N 115.99265°W / 37.01436; -115.99265 (Apodaca) 1,195 m (3,921 ft) – 241.4 m (792 ft) underground shaft,
weapons development		 250 t
Barranca August 4, 1971 13:30:00.042 PST (–8 hrs)
 NTS Area U3he 37°01′34″N 116°01′13″W / 37.02606°N 116.02031°W / 37.02606; -116.02031 (Barranca) 1,187 m (3,894 ft) – 270.74 m (888.3 ft) underground shaft,
weapons development		 less than 20 kt
Nama-Amarylis – 1 August 5, 1971 18:07:45.2 PST (–8 hrs)
 NTS Area U9itsxy3 37°08′42″N 116°02′03″W / 37.14503°N 116.03417°W / 37.14503; -116.03417 (Nama-Amarylis – 1) 1,273 m (4,177 ft) – 272.8 m (895 ft) underground shaft,
weapons development		 less than 20 kt Simultaneous, separate holes.
Nama-Mephisto – 2 August 5, 1971 18:07:45.2 PST (–8 hrs)
 NTS Area U9itsz27 37°08′26″N 116°01′56″W / 37.14062°N 116.03214°W / 37.14062; -116.03214 (Nama-Mephisto – 2) 1,276 m (4,186 ft) + underground shaft,
weapons development		 less than 20 kt Simultaneous, separate holes.
Baltic August 6, 1971 14:31:00.16 PST (–8 hrs)
 NTS Area U9itss25 37°08′18″N 116°02′31″W / 37.13843°N 116.04182°W / 37.13843; -116.04182 (Baltic) 1,260 m (4,130 ft) – 411.48 m (1,350.0 ft) underground shaft,
weapons development		 less than 20 kt
Algodones August 18, 1971 14:00:00.03 PST (–8 hrs)
 NTS Area U3jn 37°03′26″N 116°02′14″W / 37.05715°N 116.0372°W / 37.05715; -116.0372 (Algodones) 1,206 m (3,957 ft) – 527.61 m (1,731.0 ft) underground shaft,
weapons development		 67 kt
Frijoles-Deming – 1 September 22, 1971 14:00:00.037 PST (–8 hrs)
 NTS Area U3jw 37°01′18″N 116°01′01″W / 37.02158°N 116.01694°W / 37.02158; -116.01694 (Frijoles-Deming – 1) 1,186 m (3,891 ft) – 149.86 m (491.7 ft) underground shaft,
safety experiment		 500 t Simultaneous, separate holes.
Frijoles-Espuela – 2 September 22, 1971 14:00:00.04 PST (–8 hrs)
 NTS Area U3ju 37°01′22″N 116°01′01″W / 37.02268°N 116.01707°W / 37.02268; -116.01707 (Frijoles-Espuela – 2) 1,186 m (3,891 ft) + underground shaft,
safety experiment		 less than 5 kt Simultaneous, separate holes.
Frijoles-Guaje – 3 September 22, 1971 14:00:00.04 PST (–8 hrs)
 NTS Area U3hf 37°01′28″N 116°00′58″W / 37.02438°N 116.01603°W / 37.02438; -116.01603 (Frijoles-Guaje – 3) 1,186 m (3,891 ft) + underground shaft,
weapons development		 less than 5 kt Simultaneous, separate holes.
Frijoles-Petaca – 4 September 22, 1971 14:00:00.04 PST (–8 hrs)
 NTS Area U3hz 37°01′19″N 116°01′11″W / 37.02193°N 116.01963°W / 37.02193; -116.01963 (Frijoles-Petaca – 4) 1,185 m (3,888 ft) + underground shaft,
weapons development		 less than 5 kt Simultaneous, separate holes.
Pedernal September 29, 1971 14:00:00.04 PST (–8 hrs)
 NTS Area U3hg 37°00′40″N 116°00′29″W / 37.01101°N 116.00809°W / 37.01101; -116.00809 (Pedernal) 1,180 m (3,870 ft) – 378.68 m (1,242.4 ft) underground shaft,
weapons development		 4 kt
Chantilly September 29, 1971 14:30:00.14 PST (–8 hrs)
 NTS Area U2di 37°07′28″N 116°05′17″W / 37.12447°N 116.08798°W / 37.12447; -116.08798 (Chantilly) 1,280 m (4,200 ft) – 330.71 m (1,085.0 ft) underground shaft,
weapons development		 less than 20 kt
Cathay October 8, 1971 14:30:00.15 PST (–8 hrs)
 NTS Area U9ch 37°06′49″N 116°02′18″W / 37.11373°N 116.0382°W / 37.11373; -116.0382 (Cathay) 1,261 m (4,137 ft) – 377.95 m (1,240.0 ft) underground shaft,
weapons development		 7 kt
Lagoon October 14, 1971 14:30:00.16 PST (–8 hrs)
 NTS Area U10ar 37°10′48″N 116°03′14″W / 37.17987°N 116.05396°W / 37.17987; -116.05396 (Lagoon) 1,286 m (4,219 ft) – 304.8 m (1,000 ft) underground shaft,
weapons development		 5 kt
Cannikin November 6, 1971 22:00:00.06 BST (–11 hrs)
 Amchitka Island, Alaska 51°28′12″N 179°06′24″E / 51.4699°N 179.10671°E / 51.4699; 179.10671 (Cannikin) 63 m (207 ft) – 1,790 m (5,870 ft) underground shaft,
weapons development		 4.8 Mt A test of the Spartan ABM warhead. The largest underground nuclear test ever.
Diagonal Line November 24, 1971 20:15:00.17 PST (–8 hrs)
 NTS Area U11g 36°52′45″N 115°56′09″W / 36.8793°N 115.93587°W / 36.8793; -115.93587 (Diagonal Line) 1,010 m (3,310 ft) – 264.26 m (867.0 ft) underground shaft,
weapon effect		 4 kt Venting detected off site, 6.8 kCi (250 TBq) Picture of the "Ship of the Desert", a structure for capturing neutrons for experiments with this test: File:NNSA-NSO-1347.jpg.
Parnassia November 30, 1971 15:45:00.15 PST (–8 hrs)
 NTS Area U2bc 37°09′38″N 116°04′16″W / 37.16045°N 116.07112°W / 37.16045; -116.07112 (Parnassia) 1,302 m (4,272 ft) – 330.71 m (1,085.0 ft) underground shaft,
weapons development		 10 kt
Chaenactis December 14, 1971 21:09:59.16 PST (–8 hrs)
 NTS Area U2dl 37°07′26″N 116°05′26″W / 37.12393°N 116.09049°W / 37.12393; -116.09049 (Chaenactis) 1,281 m (4,203 ft) – 331.01 m (1,086.0 ft) underground shaft,
weapons development		 24 kt
Hospah December 14, 1971 21:10:01.04 PST (–8 hrs)
 NTS Area U3je 37°01′33″N 116°01′48″W / 37.02584°N 116.02992°W / 37.02584; -116.02992 (Hospah) 1,188 m (3,898 ft) – 302.03 m (990.9 ft) underground shaft,
weapons development		 11 kt
Yerba December 14, 1971 21:10:01.04 PST (–8 hrs)
 NTS Area U1c 37°01′23″N 116°03′34″W / 37.02317°N 116.05957°W / 37.02317; -116.05957 (Yerba) 1,202 m (3,944 ft) – 331.99 m (1,089.2 ft) underground shaft,
weapons development		 5 kt
Mescalero January 5, 1972 15:10:00.04 PST (–8 hrs)
 NTS Area U3gu 37°02′44″N 116°01′49″W / 37.04565°N 116.03032°W / 37.04565; -116.03032 (Mescalero) 1,198 m (3,930 ft) – 120.24 m (394.5 ft) underground shaft,
weapons development		 less than 20 kt
Cowles February 3, 1972 21:45:00.04 PST (–8 hrs)
 NTS Area U3hx 37°00′04″N 116°01′13″W / 37.00105°N 116.02016°W / 37.00105; -116.02016 (Cowles) 1,178 m (3,865 ft) – 301.78 m (990.1 ft) underground shaft,
weapons development		 2 kt
Dianthus February 17, 1972 19:02:00.16 PST (–8 hrs)
 NTS Area U10at 37°09′56″N 116°03′26″W / 37.16566°N 116.05711°W / 37.16566; -116.05711 (Dianthus) 1,279 m (4,196 ft) – 304.8 m (1,000 ft) underground shaft,
weapons development		 3.5 kt Venting detected, 18 Ci (670 GBq)
Sappho March 23, 1972 18:50:00.16 PST (–8 hrs)
 NTS Area U2dh2 37°06′47″N 116°04′54″W / 37.113°N 116.08169°W / 37.113; -116.08169 (Sappho) 1,266 m (4,154 ft) – 197.82 m (649.0 ft) underground shaft,
weapons development		 4 kt Venting detected, 9 Ci (330 GBq)
Ocate – 2 (with Onaja) March 30, 1972 21:00:00.08 PST (–8 hrs)
 NTS Area U3jp 37°00′16″N 116°00′56″W / 37.00449°N 116.01565°W / 37.00449; -116.01565 (Ocate – 2) 1,179 m (3,868 ft) + underground shaft,
weapons development		 less than 20 kt
Onaja – 1 (with Ocate) March 30, 1972 21:00:00.04 PST (–8 hrs)
 NTS Area U3js 37°00′20″N 116°01′15″W / 37.0055°N 116.02078°W / 37.0055; -116.02078 (Onaja – 1) 1,180 m (3,870 ft) – 279.04 m (915.5 ft) underground shaft,
weapons development		 8 kt
Longchamps April 19, 1972 16:32:00.16 PST (–8 hrs)
 NTS Area U2dm 37°07′19″N 116°05′05″W / 37.12204°N 116.08486°W / 37.12204; -116.08486 (Longchamps) 1,276 m (4,186 ft) – 326.44 m (1,071.0 ft) underground shaft,
weapons development		 8 kt
Jicarilla April 19, 1972 16:42:00.05 PST (–8 hrs)
 NTS Area U3jm 37°00′24″N 116°01′02″W / 37.00661°N 116.01734°W / 37.00661; -116.01734 (Jicarilla) 1,180 m (3,870 ft) – 148.11 m (485.9 ft) underground shaft,
weapons development		 less than 20 kt
Misty North May 2, 1972 19:15:00.04 PST (–8 hrs)
 NTS Area U12n.05 37°12′27″N 116°12′35″W / 37.20762°N 116.20963°W / 37.20762; -116.20963 (Misty North) 2,199 m (7,215 ft) – 376.08 m (1,233.9 ft) tunnel,
weapon effect		 19 kt
Kara May 11, 1972 14:00:00.16 PST (–8 hrs)
 NTS Area U2dh3 37°06′45″N 116°05′07″W / 37.11247°N 116.08525°W / 37.11247; -116.08525 (Kara) 1,267 m (4,157 ft) – 259.08 m (850.0 ft) underground shaft,
weapons development		 500 t Venting detected, 7 Ci (260 GBq)
Zinnia May 17, 1972 14:10:00.16 PST (–8 hrs)
 NTS Area U2dk 37°07′14″N 116°05′20″W / 37.12056°N 116.08883°W / 37.12056; -116.08883 (Zinnia) 1,277 m (4,190 ft) – 322.78 m (1,059.0 ft) underground shaft,
weapons development		 8 kt Venting detected, 7 Ci (260 GBq)
Monero May 19, 1972 17:00:00.05 PST (–8 hrs)
 NTS Area U3jg 37°03′53″N 116°00′09″W / 37.06469°N 116.0025°W / 37.06469; -116.0025 (Monero) 1,245 m (4,085 ft) – 537.35 m (1,763.0 ft) underground shaft,
weapons development		 12 kt
Merida June 7, 1972 15:20:00.16 PST (–8 hrs)
 NTS Area U2dn 37°06′57″N 116°05′10″W / 37.11579°N 116.08619°W / 37.11579; -116.08619 (Merida) 1,271 m (4,170 ft) – 204.22 m (670.0 ft) underground shaft,
weapons development		 800 t Venting detected, 10 Ci (370 GBq)
Capitan June 28, 1972 14:41:00.19 PST (–8 hrs)
 NTS Area U3jj 36°59′33″N 116°01′23″W / 36.99256°N 116.02302°W / 36.99256; -116.02302 (Capitan) 1,175 m (3,855 ft) – 134.48 m (441.2 ft) underground shaft,
weapons development		 600 t
Tajique June 28, 1972 16:30:00.07 PST (–8 hrs)
 NTS Area U7aa 37°04′10″N 115°59′34″W / 37.06958°N 115.99286°W / 37.06958; -115.99286 (Tajique) 1,274 m (4,180 ft) – 332.31 m (1,090.3 ft) underground shaft,
weapons development		 less than 20 kt
Haplopappus June 28, 1972 16:30:03.16 PST (–8 hrs)
 NTS Area U9itsw22 37°08′07″N 116°02′10″W / 37.13515°N 116.03614°W / 37.13515; -116.03614 (Haplopappus) 1,264 m (4,147 ft) – 184.4 m (605 ft) underground shaft,
weapons development		 6 kt
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