Fulcrum
Information
CountryUnited States
Test siteNTS, Areas 1–4, 6–10, Yucca Flat
Period1976–1977
Number of tests21
Test typeunderground shaft
Max. yield140 kilotonnes of TNT (590 TJ)
Test series chronology

The United States's Fulcrum nuclear test series[1] was a group of 21 nuclear tests conducted in 1976–1977. These tests [note 1] followed the Operation Anvil (nuclear test) series and preceded the Operation Cresset series.

United States' Fulcrum series tests and detonations
Name [note 2] Date time (UT) Local time zone[note 3][2] Location[note 4] Elevation + height [note 5] Delivery [note 6]
Purpose [note 7] 		Device[note 8] Yield[note 9] Fallout[note 10] References Notes
Gouda October 6, 1976 14:30:00.164 PST (–8 hrs)
NTS Area U2ef 37°08′04″N 116°03′47″W / 37.13451°N 116.06315°W / 37.13451; -116.06315 (Gouda) 1,272 m (4,173 ft) – 200.1 m (656 ft) underground shaft,
weapons development 		600 t [1][3][4][5]
Sprit November 10, 1976 14:58:00.077 PST (–8 hrs)
NTS Area U3hc 37°02′09″N 116°01′05″W / 37.03593°N 116.01816°W / 37.03593; -116.01816 (Sprit) 1,192 m (3,911 ft) – 183.18 m (601.0 ft) underground shaft,
weapons development 		less than 20 kt [1][4][5]
Chevre November 23, 1976 15:15:00.163 PST (–8 hrs)
NTS Area U10ay 37°10′18″N 116°03′13″W / 37.17167°N 116.0535°W / 37.17167; -116.0535 (Chevre) 1,278 m (4,193 ft) – 317.3 m (1,041 ft) underground shaft,
weapons development 		2 kt [1][4][5]
Redmud December 8, 1976 14:49:30.083 PST (–8 hrs)
NTS Area U7ab 37°04′45″N 116°00′09″W / 37.07922°N 116.00249°W / 37.07922; -116.00249 (Redmud) 1,269 m (4,163 ft) – 426.72 m (1,400.0 ft) underground shaft,
weapons development 		20 kt [1][4][5]
Asiago December 21, 1976 15:09:00.166 PST (–8 hrs)
NTS Area U2ar 37°07′26″N 116°04′06″W / 37.12386°N 116.06833°W / 37.12386; -116.06833 (Asiago) 1,265 m (4,150 ft) – 330.8 m (1,085 ft) underground shaft,
weapons development 		11 kt [1][4][5]
Sutter December 21, 1976 15:58:00.162 PST (–8 hrs)
NTS Area U2bw 37°09′07″N 116°03′52″W / 37.15205°N 116.06454°W / 37.15205; -116.06454 (Sutter) 1,287 m (4,222 ft) – 200.3 m (657 ft) underground shaft,
weapons development 		less than 20 kt [1][4][5]
Rudder December 28, 1976 18:00:00.076 PST (–8 hrs)
NTS Area U7aj(s) 37°06′01″N 116°02′15″W / 37.1004°N 116.03755°W / 37.1004; -116.03755 (Rudder) 1,255 m (4,117 ft) – 638.56 m (2,095.0 ft) underground shaft,
weapons development 		89 kt [1][4][5][6][7]
Cove - 1 (with Oarlock) February 16, 1977 17:53:00.16 PST (–8 hrs)
NTS Area U3ki 37°00′24″N 116°01′56″W / 37.00662°N 116.0321°W / 37.00662; -116.0321 (Cove - 1) 1,181 m (3,875 ft) + underground shaft,
weapons development 		3 kt [1][4][5] Simultaneous, separate holes.
Oarlock - 2 (with Cove) February 16, 1977 17:53:00.073 PST (–8 hrs)
NTS Area U3km 37°00′48″N 116°01′46″W / 37.01346°N 116.02937°W / 37.01346; -116.02937 (Oarlock - 2) 1,183 m (3,881 ft) – 317.6 m (1,042 ft) underground shaft,
weapons development 		8 kt [1][4][5] Simultaneous, separate holes.
Dofino - 1 March 8, 1977 14:24:00.164 PST (–8 hrs)
NTS Area U10ba 37°10′34″N 116°03′14″W / 37.17616°N 116.05385°W / 37.17616; -116.05385 (Dofino - 1) 1,283 m (4,209 ft) – 182.88 m (600.0 ft) underground shaft,
weapons development 		800 t Venting detected, 25 Ci (920 GBq) [1][3][4][5][8] Simultaneous, same hole.
Dofino-Lawton - 2 March 8, 1977 14:24:00.16 PST (–8 hrs)
NTS Area U10ba 37°10′34″N 116°03′14″W / 37.17616°N 116.05385°W / 37.17616; -116.05385 (Dofino-Lawton - 2) 1,283 m (4,209 ft) – 282 m (925 ft) underground shaft,
weapons development 		less than 20 kt Venting detected [1][4][5][8] Simultaneous, same hole.
Marsilly April 5, 1977 15:00:00.167 PST (–8 hrs)
NTS Area U2ei 37°07′13″N 116°03′47″W / 37.12019°N 116.06315°W / 37.12019; -116.06315 (Marsilly) 1,259 m (4,131 ft) – 689.73 m (2,262.9 ft) underground shaft,
weapons development 		140 kt Venting detected, 15 Ci (560 GBq) [1][4][5][6][8][9]
Bulkhead April 27, 1977 15:00:00.084 PST (–8 hrs)
NTS Area U7am 37°05′41″N 116°01′44″W / 37.09474°N 116.02875°W / 37.09474; -116.02875 (Bulkhead) 1,259 m (4,131 ft) – 594.36 m (1,950.0 ft) underground shaft,
weapons development 		67 kt [1][4][5][6]
Crewline May 25, 1977 17:00:00.076 PST (–8 hrs)
NTS Area U7ap 37°05′39″N 116°02′45″W / 37.0943°N 116.04574°W / 37.0943; -116.04574 (Crewline) 1,237 m (4,058 ft) – 564.18 m (1,851.0 ft) underground shaft,
weapons development 		51 kt [1][4][5][6]
Forefoot June 2, 1977 17:15:00.098 PST (–8 hrs)
NTS Area U3kf 37°03′18″N 116°01′33″W / 37.0549°N 116.02583°W / 37.0549; -116.02583 (Forefoot) 1,207 m (3,960 ft) – 193.55 m (635.0 ft) underground shaft,
weapons development 		less than 20 kt [1][4][5]
Carnelian July 28, 1977 14:07:00.162 PST (–8 hrs)
NTS Area U4af 37°05′51″N 116°05′31″W / 37.09751°N 116.09182°W / 37.09751; -116.09182 (Carnelian) 1,265 m (4,150 ft) – 208 m (682 ft) underground shaft,
weapons development 		600 t Venting detected, 7 Ci (260 GBq) [1][3][4][5][8]
Strake August 4, 1977 16:40:00.074 PST (–8 hrs)
NTS Area U7ae 37°05′11″N 116°00′28″W / 37.08652°N 116.00774°W / 37.08652; -116.00774 (Strake) 1,273 m (4,177 ft) – 517.55 m (1,698.0 ft) underground shaft,
weapons development 		44 kt [1][4][5][6]
Gruyere - 1 August 16, 1977 14:41:00.165 PST (–8 hrs)
NTS Area U9cg 37°08′42″N 116°03′00″W / 37.14512°N 116.04996°W / 37.14512; -116.04996 (Gruyere - 1) 1,263 m (4,144 ft) – 206.96 m (679.0 ft) underground shaft,
weapons development 		less than 20 kt [1][3][4][5] Simultaneous, same hole.
Gruyere-Gradino - 2 August 16, 1977 14:41:00.16 PST (–8 hrs)
NTS Area U9cg 37°08′42″N 116°03′00″W / 37.14512°N 116.04996°W / 37.14512; -116.04996 (Gruyere-Gradino - 2) 1,263 m (4,144 ft) – 320 m (1,050 ft) underground shaft,
weapons development 		600 t Venting detected, 0.8 Ci (30 GBq) [1][4][5][8] Simultaneous, same hole.
Flotost August 16, 1977 15:49:00.168 PST (–8 hrs)
NTS Area U2ao 37°08′48″N 116°03′50″W / 37.14669°N 116.06402°W / 37.14669; -116.06402 (Flotost) 1,284 m (4,213 ft) – 274.93 m (902.0 ft) underground shaft,
weapons development 		1.5 kt Venting detected, 3 Ci (110 GBq) [1][3][4][5][8]
Scupper August 19, 1977 17:32:00.098 PST (–8 hrs)
NTS Area U3hj 37°01′03″N 116°01′57″W / 37.01757°N 116.03248°W / 37.01757; -116.03248 (Scupper) 1,185 m (3,888 ft) – 449.58 m (1,475.0 ft) underground shaft,
weapons development 		200 t [1][3][4][5][6]
Scantling August 19, 1977 17:55:00.1 PST (–8 hrs)
NTS Area U4h 37°06′36″N 116°03′20″W / 37.10997°N 116.05567°W / 37.10997; -116.05567 (Scantling) 1,246 m (4,088 ft) – 701.04 m (2,300.0 ft) underground shaft,
weapons development 		120 kt [1][4][5][6][7]
Ebbtide September 15, 1977 14:36:30.077 PST (–8 hrs)
NTS Area U3kt 37°01′58″N 116°02′38″W / 37.03274°N 116.044°W / 37.03274; -116.044 (Ebbtide) 1,194 m (3,917 ft) – 379.48 m (1,245.0 ft) underground shaft,
weapons development 		6 kt [1][4][5]
Coulommiers September 27, 1977 14:00:00.161 PST (–8 hrs)
NTS Area U2ei 37°09′04″N 116°04′06″W / 37.15112°N 116.06843°W / 37.15112; -116.06843 (Coulommiers) 1,292 m (4,239 ft) – 530.35 m (1,740.0 ft) underground shaft,
weapons development 		20 kt Venting detected, 0.9 Ci (33 GBq) [1][4][5][6][8][9]
  1. ↑ A bomb test may be a salvo test, defined as two or more explosions "where a period of time between successive individual explosions does not exceed 5 seconds and where the burial points of all explosive devices can be connected by segments of straight lines, each of them connecting two burial points and does not exceed 40 kilometers in length". Mikhailov, V. N., Editor in Chief. "Catalog of World Wide Nuclear Testing". Begell-Atom, LLC. Archived from the original on April 26, 2014. {{cite journal}}: |first= has generic name (help); Cite journal requires |journal= (help)CS1 maint: multiple names: authors list (link)
  2. ↑ The US, France and Great Britain have code-named their test events, while the USSR and China did not, and therefore have only test numbers (with some exceptions – Soviet peaceful explosions were named). Word translations into English in parentheses unless the name is a proper noun. A dash followed by a number indicates a member of a salvo event. The US also sometimes named the individual explosions in such a salvo test, which results in "name1 – 1(with name2)". If test is canceled or aborted, then the row data like date and location discloses the intended plans, where known.
  3. ↑ To convert the UT time into standard local, add the number of hours in parentheses to the UT time; for local daylight saving time, add one additional hour. If the result is earlier than 00:00, add 24 hours and subtract 1 from the day; if it is 24:00 or later, subtract 24 hours and add 1 to the day. Historical time zone data obtained from the IANA time zone database.
  4. ↑ Rough place name and a latitude/longitude reference; for rocket-carried tests, the launch location is specified before the detonation location, if known. Some locations are extremely accurate; others (like airdrops and space blasts) may be quite inaccurate. "~" indicates a likely pro-forma rough location, shared with other tests in that same area.
  5. ↑ Elevation is the ground level at the point directly below the explosion relative to sea level; height is the additional distance added or subtracted by tower, balloon, shaft, tunnel, air drop or other contrivance. For rocket bursts the ground level is "N/A". In some cases it is not clear if the height is absolute or relative to ground, for example, Plumbbob/John. No number or units indicates the value is unknown, while "0" means zero. Sorting on this column is by elevation and height added together.
  6. ↑ Atmospheric, airdrop, balloon, gun, cruise missile, rocket, surface, tower, and barge are all disallowed by the Partial Nuclear Test Ban Treaty. Sealed shaft and tunnel are underground, and remained useful under the PTBT. Intentional cratering tests are borderline; they occurred under the treaty, were sometimes protested, and generally overlooked if the test was declared to be a peaceful use.
  7. ↑ Include weapons development, weapon effects, safety test, transport safety test, war, science, joint verification and industrial/peaceful, which may be further broken down.
  8. ↑ Designations for test items where known, "?" indicates some uncertainty about the preceding value, nicknames for particular devices in quotes. This category of information is often not officially disclosed.
  9. ↑ Estimated energy yield in tons, kilotons, and megatons. A ton of TNT equivalent is defined as 4.184 gigajoules (1 gigacalorie).
  10. ↑ Radioactive emission to the atmosphere aside from prompt neutrons, where known. The measured species is only iodine-131 if mentioned, otherwise it is all species. No entry means unknown, probably none if underground and "all" if not; otherwise notation for whether measured on the site only or off the site, where known, and the measured amount of radioactivity released.

References

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Yang, Xiaoping; North, Robert; Romney, Carl (August 2000), CMR Nuclear Explosion Database (Revision 3), SMDC Monitoring Research
  2. ↑ "Time Zone Historical Database". iana.com. Retrieved March 8, 2014.
  3. 1 2 3 4 5 6 Norris, Robert Standish; Cochran, Thomas B. (February 1, 1994), "United States nuclear tests, July 1945 to 31 December 1992 (NWD 94-1)" (PDF), Nuclear Weapons Databook Working Paper, Washington, DC: Natural Resources Defense Council, archived from the original (PDF) on October 29, 2013, retrieved October 26, 2013
  4. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Official list of underground nuclear explosions, Sandia National Laboratories, July 1, 1994, retrieved December 18, 2013
  5. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 United States Nuclear Tests: July 1945 through September 1992 (PDF) (DOE/NV-209 REV15), Las Vegas, NV: Department of Energy, Nevada Operations Office, December 1, 2000, archived from the original (PDF) on October 12, 2006, retrieved December 18, 2013
  6. 1 2 3 4 5 6 7 8 Hechanova, Anthony E.; O'Donnell, James E. (September 25, 1998), Estimates of yield for nuclear tests impacting the groundwater at the Nevada Test Site, Nuclear Science and Technology Division
  7. 1 2 Operation Argus, 1958 (DNA6039F), Washington, DC: Defense Nuclear Agency, Department of Defense, 1982, retrieved November 26, 2013
  8. 1 2 3 4 5 6 7 Radiological Effluents Released from U.S. Continental Tests 1961 Through 1992 (DOE/NV-317 Rev. 1) (PDF), DOE Nevada Operations Office, August 1996, archived from the original (PDF) on November 3, 2013, retrieved October 31, 2013
  9. 1 2 Estimated exposures and thyroid doses received by the American people from Iodine-131 in fallout following Nevada atmospheric nuclear bomb tests, Chapter 2 (PDF), National Cancer Institute, 1997, retrieved January 5, 2014
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