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Trinity Site - Jumbo

Lying next to the entrance of the chain link fence that still surrounds Trinity Site are the rusty remains of Jumbo. Jumbo was the code name for the 214-ton Thermos shaped steel and concrete container designed to hold the precious plutonium core of the Trinity device in case of a nuclear mis-fire. Built by the Babcock and Wilcox Company of Barberton, Ohio, Jumbo was 28 feet long, 12 feet, 8 inches in diameter, and with steel walls up to 16 inches thick.

The idea of using some kind of container for the Trinity device was based on the fact that plutonium was extremely expensive and very difficult to produce. So, much thought went into a way of containing the 15 lb. plutonium core of the bomb, in case the 5,300 lbs. of conventional high explosives surrounding the core exploded without setting off a nuclear blast, and in the process scattering the costly plutonium (about 250 million dollars worth) across the dessert. After extensive research and testing of other potential containment ideas, the concept of Jumbo was decided on in the late summer of 1944.

However, by the spring of 1945, after Jumbo had already been built and transported (with great difficulty) to the Trinity Site by the Eichleay Corporation of Pittsburgh, it was decided not to explode the Trinity device inside of Jumbo after all. There were several reasons for this new decision: first, plutonium had become more readily (relatively) available; second, the Project scientists decided that the Trinity device would probably work as planned; and last, the scientists realized that if Jumbo were used it would adversely affect the test results, and add 214 tons of highly radioactive material to the atmosphere.

Not knowing what else to do with the massive 12 million dollar Jumbo, it was decided to suspend it from a steel tower 800 yards from Ground Zero to see how it would withstand the Trinity test. Jumbo survived the approximately 20 kiloton Trinity blast undamaged, but its supporting 70-foot tall steel tower was flattened.

Two years later, in an attempt to destroy the unused Jumbo before it and its 12 million dollar cost came to the attention of a congressional investigating committee, Manhattan Project Director General Groves ordered two junior officers from the Special Weapons Division at Sandia Army Base in Albuquerque to test Jumbo. The Army officers placed eight 500-pound conventional bombs in the bottom of Jumbo. Since the bombs were on the bottom of Jumbo, and not the center (the correct position), the resultant explosion blew both ends off Jumbo.  Unable to totally destroy Jumbo, the Army then buried it in the desert near Trinity Site. It was not until the early 1970s that the impressive remains of Jumbo, still weighing over 180 tons, were moved to their present location.

RELATED LINKS
Learn About Trinity - The First Atomic Test
The First Atomic Test
The National Atomic Museum
Notes & Bibliography
Schmidt-McDonald Ranch House
RECOMMENDED  LITERATURE

Nuclear Rescue 911 - Broken Arrows & Incidents (2001) - The U.S. government uses the phrase "broken arrow" to refer to an accident involving a nuclear weapon, and as Nuclear Rescue 911: Broken Arrows & Incidents makes chillingly clear, there have been many more such mishaps than the public realizes. Between 1950 and 1980, there were 32 accidents that involved a nuke, dire situations that featured crashing bombers, disappearing submarines, and even a deadly fiasco in Arkansas triggered when a hapless technician dropped a socket wrench down a missile silo. While some of these events were calamitous, none of them, thankfully, actually set off a nuclear explosion. This film, however, makes the point that some of these misfortunes came astonishingly close to wiping out millions of people. Using a combination of news footage and stock archival footage to portray real events, and a narration delivered by Adam West of Batman fame, the documentary is appropriately sober and tends not to be sensationalistic. Credibility is established by some interviews with participants in the various accidents, and a former Department of Energy spokesman appears throughout to provide details about particular events. An interesting DVD bonus item is an alarmingly upbeat 1950s vintage film short the U.S. Air Force made to showcase its safety procedures in handling nuclear weapons at the height of the cold war.

 
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