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US's most powerful nuclear bomb being dismantled

2011-10-26 03:32:22 GMT2011-10-26 11:32:22(Beijing Time)  SINA.com

A B53 bomb is seen in this handout taken October 19, 2011 and released October 20, 2011. The U.S. Department of Energy's National Nuclear Security Administration (NNSA) will dismantle the last of the nation's strongest nuclear bombs in its weapons stockpile at the Pantex Plant near Amarillo on October 25, 2011, local media reported. The bomb was first put into service during the Cold War and is considered to be more powerful than the atomic bomb dropped on Hiroshima. REUTERS

Production technicians conduct a training class on the B53 bomb in this handout taken October 19, 2011 and released October 20, 2011. The U.S. Department of Energy's National Nuclear Security Administration (NNSA) will dismantle the last of the nation's strongest nuclear bombs in its weapons stockpile at the Pantex Plant near Amarillo on October 25, 2011, local media reported.

Workers unload a B53 bomb in this handout taken February 14, 2011 and released October 20, 2011. The U.S. Department of Energy's National Nuclear Security Administration (NNSA) will dismantle the last of the nation's strongest nuclear bombs in its weapons stockpile at the Pantex Plant near Amarillo on October 25, 2011, local media reported. The bomb was first put into service during the Cold War and is considered to be more powerful than the atomic bomb dropped on Hiroshima. REUTERS

An aerial view of the U.S. Department of Energy's Pantex Plant near Amarillo, Texas, is shown on Sept. 4, 1992. The plutonium guts of about 9,000 former atomic weapons currently sit in storage, with about that many more waiting to be removed at the plant. (AP Photo/Pantex Plant, file)

AMARILLO, Texas — The last of the nation's most powerful nuclear bombs — a weapon hundreds of times stronger than the bomb dropped on Hiroshima — is being disassembled nearly half a century after it was put into service at the height of the Cold War.

The final components of the B53 bomb will be broken down Tuesday at the Pantex Plant near Amarillo, the nation's only nuclear weapons assembly and disassembly facility. The completion of the dismantling program is a year ahead of schedule, according to the U.S. Department of Energy's National Nuclear Security Administration, and aligns with President Barack Obama's goal of reducing the number of nuclear weapons.

Thomas D'Agostino, the nuclear administration's chief, called the bomb's elimination a "significant milestone."

Put into service in 1962, when Cold War tensions peaked during the Cuban Missile Crisis, the B53 weighed 10,000 pounds and was the size of a minivan. According to the American Federation of Scientists, it was 600 times more powerful than the atomic bomb dropped on Hiroshima, Japan, killing as many as 140,000 people and helping end World War II.

The B53 was designed to destroy facilities deep underground, and it was carried by B-52 bombers.

With its destruction, the next largest bomb in operation will be the B83, said Hans Kristensen, a spokesman for the Federation of American Scientists. It's 1.2 megatons, while the B53 was 9 megatons.

The B53's disassembly ends the era of big megaton bombs, he said. The bombs' size helped compensate for their lack of accuracy. Today's bombs are smaller but more precise, reducing the amount of collateral damage, Kristensen said.

Since the B53 was made using older technology by engineers who have since retired or died, developing a disassembly process took time. Engineers had to develop complex tools and new procedures to ensure safety.

"We knew going in that this was going to be a challenging project, and we put together an outstanding team with all of our partners to develop a way to achieve this objective safely and efficiently," said John Woolery, the plant's general manager.

Many of the B53s were disassembled in the 1980s, but a significant number remained in the U.S. arsenal until they were retired from the stockpile in 1997. Pantex spokesman Greg Cunningham said he couldn't comment on how many of the bombs have been disassembled at the Texas plant.

The weapon is considered dismantled when the roughly 300 pounds of high explosives inside are separated from the special nuclear material, known as the pit. The uranium pits from bombs dismantled at Pantex will be stored on an interim basis at the plant, Cunningham said.

The non-nuclear material and components are then processed, which includes sanitizing, recycling and disposal, the National Nuclear Security Administration said last fall when it announced the Texas plant's role in the B53 dismantling.

The plant will play a large role in similar projects as older weapons are retired from the U.S.'s nuclear arsenal.

(Agencies)

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