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Mappa di localizzazione: Stati Uniti d'America
374-7
374-7
Location in the United States
Mappa non disponibile (USA Arkansas)

The Damascus Titan missile explosion (also called the Damascus accident[1]) was a 1980 U.S. nuclear weapons incident involving a Titan II Intercontinental Ballistic Missile (ICBM). The incident occurred on September 18–19, 1980, at Missile Complex 374-7 in rural Arkansas when a U.S. Air Force LGM-25C Titan II ICBM loaded with a 9-megaton W-53 nuclear warhead experienced a liquid fuel explosion inside its silo.[2]

L'incidente è iniziato con una perdita di carburante alle 18:30 del 18 settembre ed è culminato con l'esplosione alle 3:00 circa del 19 settembre, che ha causato l'espulsione della testata dal suo silo.[2] The warhead landed a short distance away and no radioactive material was lost.

Strategic Missile (SM) sites of 373rd & 374th Strategic Missile Squadrons, reporting to the 308th Strategic Missile Wing.

Launch complex

Launch Complex 374-7 was located in Bradley Township, Van Buren County farmland just 3.3 miles (5.3 km) NNE of Damascus, and approximately 50 miglia (80 km) north of Little Rock.[3][4]

The Strategic Air Command facility of Little Rock Air Force Base was one of eighteen silos in the command of the 308th Strategic Missile Wing (308th SMW), specifically one of the nine silos within its 374th Strategic Missile Squadron (374th SMS), at the time of the explosion.

Incident

Leadup

At around 6:30 p.m. CDT on Thursday, September 18, 1980, two airmen from a Propellant Transfer System (PTS) team were checking the pressure on the oxidizer tank of a USAF Titan II missile at Little Rock AFB's Launch Complex 374-7. One of the workers, Airman David P. Powell, had brought a ratchet wrench – 3 ft (0,9 m) long weighing 25 lb (11 kg) – into the silo instead of a torque wrench, the latter having been newly mandated by Air Force regulations.[5] Powell later claimed that he was already below ground in his safety suit when he realized he had brought the wrong wrench, so he chose to continue rather than turn back.[5] The 8 lb (3,6 kg) socket fell off the ratchet and dropped approximately 80 piedi (24 m) before bouncing off a thrust mount and piercing the missile's skin over the first-stage fuel tank, causing it to leak a cloud of its Aerozine 50 fuel.

Aerozine 50 is hypergolic with the Titan II's oxidizer, dinitrogen tetroxide, such that they spontaneously ignite upon contact with each other. The nitrogen tetroxide is kept in a second tank in the rocket's first stage, directly above the fuel tank and below the second stage and its nine-megaton W-53 nuclear warhead.

Eventually, the missile combat crew and the PTS team evacuated the launch control center, while military and civilian response teams arrived to tackle the hazardous situation. Lieutenant General Lloyd R. Leavitt Jr., the Vice Commander of the Strategic Air Command, commanded the effort to save the launch complex.[6] There was concern for the possible collapse of the now-empty first-stage fuel tank, which could cause the rest of the 8-story missile to fall and rupture, allowing the oxidizer to contact the fuel already in the silo.

Explosion

A Titan II ICBM in its launch silo

Early in the morning of September 19, a two-man PTS investigation team consisting of Senior Airman David Lee Livingston and Sergeant Jeff K. Kennedy entered the silo. Because their vapor detectors indicated an explosive atmosphere, the two were ordered to evacuate. The team was then ordered to reenter the silo to turn on an exhaust fan. Livingston reentered the silo to carry out the order and shortly thereafter, at about 3:00 a.m., the hypergolic fuel exploded—likely due to arcing in the exhaust fan. The initial explosion catapulted the 740-ton silo door away from the silo and ejected the second stage and warhead. Once clear of the silo, the second stage exploded. The W53 thermonuclear warhead landed about 100 piedi (30 m) from the launch complex's entry gate. Its safety features prevented any loss of radioactive material or nuclear detonation.[7][8]

Aftermath

Livingston died at the hospital, and 21 others in the immediate vicinity of the blast sustained various injuries; Kennedy struggled with respiratory issues from inhaling oxidizer but survived. Livingston was posthumously promoted to staff sergeant.[2] The entire missile launch complex was destroyed.[2]

At daybreak, the Air Force retrieved the warhead,[9][10] which was returned to the Pantex weapons assembly plant.[11]

The launch complex was never repaired. Pieces of debris were taken away from the 400 acri (1,6 km²) surrounding the facility, and the site was buried under a mound of gravel, soil, and small concrete debris. The land is now under private ownership.[2][12] The site was listed on the National Register of Historic Places on February 18, 2000.[2]

Kennedy, initially praised as a hero, later received an official letter of reprimand for his first entry into the complex, as it later transpired that he had disregarded an order to stay away.[5]

A 1988 television film, Disaster at Silo 7, is based on this event.[13]

Season 4, episode 4 (ep. 75) of Scorpion is largely based on this event.[14]  Videos In September 2013, Eric Schlosser published a book titled Command and Control: Nuclear Weapons, the Damascus Accident, and the Illusion of Safety.[1] It focused on the explosion, as well as other Broken Arrow incidents during the Cold War.[1][15][16] A documentary film titled Command and Control from director Robert Kenner, based on Schlosser's book, was released on January 10, 2017. The film was broadcast by PBS as part of its American Experience series.[8][17]

Jeff Plumb's account of his role in the incident was featured in a 2017 episode of WBEZ's This American Life.[18]

See also

References

  1. ^ a b c Eric Schlosser, Command and Control: Nuclear Weapons, the Damascus Accident, and the Illusion of Safety, Penguin Press, 2013, pp. Title, ISBN 978-1594202278.
  2. ^ a b c d e f www.encyclopediaofarkansas.net, http://www.encyclopediaofarkansas.net/encyclopedia/entry-detail.aspx?entryID=2543. URL consultato il 20 gennaio 2018.
  3. ^ http://archives.chicagotribune.com/1980/09/20/page/1/article/missile-silo-blast-probed.
  4. ^ https://news.google.com/newspapers?id=a35QAAAAIBAJ&pg=5108%2C3062852.
  5. ^ a b c The Washington Post, https://www.washingtonpost.com/archive/politics/1981/02/12/hero-of-titan-ii-missile-explosion-is-reprimanded-by-air-force/f02bbbfe-13a0-42bc-825b-2a2ad9bd3cfd/.
  6. ^ Washington Post, https://www.washingtonpost.com/archive/politics/1980/12/09/colonel-replaced-in-action-linked-to-fatal-titan-explosion/bcf27943-dfc7-4776-9efe-835af2db575d/.
  7. ^ Eric Schlosser, Command and Control: Nuclear Weapons, the Damascus Accident, and the Illusion of Safety, Penguin Press, 2013, ISBN 978-1-59420-227-8.
  8. ^ a b www.pbs.org, https://www.pbs.org/wgbh/americanexperience/films/command-and-control/. URL consultato il 18 May 2017.
  9. ^ http://archives.chicagotribune.com/1980/09/21/page/3/article/what-warhead-air-force-aides-ask.
  10. ^ https://news.google.com/newspapers?id=UPJVAAAAIBAJ&pg=3821%2C5962886.
  11. ^ https://news.google.com/newspapers?id=gcheAAAAIBAJ&pg=2364%2C3232309.
  12. ^ Eric Schlosser, Command and Control: Nuclear Weapons, the Damascus Accident, and the Illusion of Safety, Penguin Press, 2013, p. 484, ISBN 978-1-59420-227-8.
  13. ^ imdb.com, https://www.imdb.com/title/tt0095032/fullcredits#cast. URL consultato il 18 May 2017.
  14. ^ tvguide.com, http://www.tvguide.com/tvshows/scorpion/episode-4-season-4/nuke-kids-on-the-block/660762/. URL consultato il 16 October 2017.
  15. ^ Walter Russell Mead, The New York Times, https://www.nytimes.com/2013/09/15/books/review/command-and-control-by-eric-schlosser.html?pagewanted=all&_r=0.
  16. ^ The New York Times, http://artsbeat.blogs.nytimes.com/2012/10/05/fast-food-nation-author-will-return-with-book-on-nuclear-weapons/.
  17. ^ (EN) Salon, https://www.salon.com/2016/09/14/the-night-we-almost-lost-arkansas-a-1980-nuclear-armageddon-that-almost-was/. URL consultato il 18 novembre 2020.
    «On a September night 36 years ago, we nearly lost Arkansas. Some people may regard that as a mixed blessing, even now – Bill Clinton and his wife, then the governor and first lady of that state, were less than 50 miles away in Little Rock, at the Arkansas Democratic Convention. If the Titan 2 intercontinental ballistic missile, or ICBM, that exploded inside its silo in Damascus, Arkansas, had detonated its nuclear warhead, both the Clintons and Vice President Walter Mondale (also attending the convention) would have been dead within minutes.»
  18. ^ thisamericanlife.org, https://www.thisamericanlife.org/634/human-error-in-volatile-situations.

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