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Friday, June 16, 2006

Rival U.S. Labs in Arms Race to Build Safer Nuclear Bomb
by Ralph Vartabedian, LA Times, June 13, 2006

Last Updated: Friday, June 16, 2006 04:18:25 AM

 


The new warhead could help reduce the nation's stockpile, but some fear global repercussions


INTERACTIVE FEATURE
A Better Bomb
(Click on the pic)

 

n the Cold War arms race, scientists rushed to build thousands of warheads to counter the Soviet Union. Today, those scientists are racing once again, but this time to rebuild an aging nuclear stockpile.

Scientists at Los Alamos National Laboratory in New Mexico are locked in an intense competition with rivals at Lawrence Livermore National Laboratory in the Bay Area to design the nation's first new nuclear bomb in two decades.

The two labs have fiercely competed in the bomb trade with technologies as disparate as Microsoft's and Apple's.

The new weapon, under development for about a year, is designed to ensure long-term reliability of the nation's inventory of bombs. Program backers say that with greater confidence in the quality of its weapons, the nation could draw down its stockpile, estimated at about 6,000 warheads.

Scientists also intend for the new weapons to be less vulnerable to accidental detonation and to be so secure that any stolen or lost weapon would be unusable.

By law, the new weapons would pack the same explosive power as existing warheads and be suitable only for the same kinds of military targets as those of the weapons they replace. Unlike past proposals for new atomic weapons, the project has captured bipartisan support in Congress.

But some veterans of nuclear arms development are strongly opposed, contending that building new weapons could trigger another arms race with Russia and China, as well as undermine arguments to stop nuclear developments in Iran, North Korea and elsewhere.

And, the critics say, It would eventually increase pressure to resume underground nuclear testing, which the U.S. halted 14 years ago.

Inside the labs, however, emotions and enthusiasm for the new designs are running high.

Joseph Martz
Joseph Martz

 

"I have had people working nights and weekends," said Joseph Martz, head of the Los Alamos design team. "I have to tell them to go home. I can't keep them out of the office. This is a chance to exercise skills that we have not had a chance to use for 20 years."

A thousand miles away at Livermore, Bruce Goodwin, associate director for nuclear weapons, described a similar picture: The lab is running supercomputer simulations around the clock, and teams of scientific experts working on all phases of the project "are extremely excited."

The program to build the new bomb, known as the "reliable replacement warhead," was approved by Congress in 2005 as part of a defense spending bill. The design work is being supervised by the National Nuclear Security Administration, which is part of the Energy Department.

The laboratories submitted detailed design proposals in March that ran more than 1,000 pages each to the Nuclear Weapons Council, the secretive federal panel that oversees the nation's nuclear weapons. A winner will be declared this year.

Paul Hommert

 

If the program is implemented, it would require an expensive remobilization of the nation's nuclear weapons complex, creating a capacity to turn out bombs at the rate of three or more a week.

Proponents of the project foresee a time when nuclear deterrence will increasingly rest on the nation's capacity to build new bombs, rather than on maintaining a massive stockpile.

The proposal comes as Russia and the United States have agreed to further reduce nuclear stockpiles. The Moscow Treaty signed in 2002 by President Bush and Russian President Vladimir V. Putin calls for each country to cut inventories to between 1,700 and 2,200 warheads by 2012.

Without the reliable replacement warhead, U.S. scientists say the nation will end up with old and potentially unreliable bombs within the next 15 years, allowing adversaries to challenge U.S. supremacy and erode the nation's so-called strategic deterrent.


The new bomb "is one way of ensuring that our capability is second to none," said Paul Hommert, a physicist who heads X Division, the Los Alamos unit that built the first atomic bomb during World War II. "Not only today, but in 2025."

But critics say the program could plant the seeds of a new arms race.

The existing stockpile will be safe and reliable for decades to come, according to defense experts and nuclear scientists who have long supported strategic weapons. They say that rather than making the nation safer, the program will squander resources, broadcast the message that arms control is dead and even undermine the reliability of U.S. weapons.

The new bomb would have to be built and deployed without testing. The U.S. last conducted an underground test in Nevada in 1992 and has since imposed a moratorium on new testing.

But without a single test, doubts about the new bomb's reliability would eventually grow, said Sidney Drell, former director of Stanford University's Linear Accelerator Center and a longtime advisor to the Energy Department.

Sidney Drell
Sidney Drell, Stanford

 

"If anybody thinks we are going to be designing new warheads and not doing testing, I don't know what they are smoking," Drell said. "I don't know of a general, an admiral, a president or anybody in responsibility who would take an untested new weapon that is different from the ones in our stockpile and rely on it without resuming testing."

If the U.S. breaks the moratorium on testing, then Russia, China, India and Pakistan, if not Britain and France, probably would conduct tests as well, said Philip Coyle, former assistant secretary of Defense and former deputy director of Livermore. Those countries would gain more information from testing than would the U.S., which has invested heavily in scientific research as an alternative to testing.

Physicist Richard Garwin, who helped design the first hydrogen bomb in the early 1950s and remains a leading authority on nuclear weapons, opposes the new bomb and is worried it would lead to new testing. "We don't need it," he said. "No science will be able to keep these political doubts away."

Linton F. Brooks, chief of the National Nuclear Security Administration, disagrees, saying warheads based on modern technology and advanced electronics would be more reliable.

"We are more likely to face a problem if we stick with the existing stockpile," Brooks said. "It is easy to overstate the degree to which the current stockpile [has been] tested."

The stockpile includes thousands of weapons held in reserve in case a defect is discovered. Each year, some of those weapons are disassembled for inspection. The U.S. could significantly reduce the reserve if it had greater confidence in the reliability of its warheads, Brooks said.

That confidence involves not only whether a weapon will explode, but whether it will do so with the intended force. In every U.S. nuclear weapon, a primary blast must be strong enough to trigger a secondary thermonuclear reaction. If the first stage falls short, the weapon has half the power.

The driving force for developing the new weapon has come from the scientific community and members of Congress. Although the Defense Department did not initiate the program, it has won wide support within the military as well as the Bush administration.

Democrats who are closely involved in nuclear weapons issues, including Reps. Ellen O. Tauscher of Alamo, John M. Spratt Jr. of South Carolina and Ike Skelton of Missouri, have also given the program support, according to their spokesmen.

Rep. David Hobson (R-Ohio)
Rep. David Hobson

 

The support of Tauscher and the other lawmakers is conditional on a reduction in the total number of U.S. nuclear weapons and an absence of testing — precisely the policy set up by Rep. David L. Hobson (R-Ohio), who spearheaded the program in Congress.

In the past, a wide range of proposals for new bombs fizzled politically, including the neutron bomb, the bunker-busting "mini-nuke" and the "robust nuclear Earth penetrator." Each represented weapons envisioned for specific military missions, triggering fears that they might be used preemptively rather than to deter an attack.

The reliable replacement warhead has dodged such opposition, largely because it is not intended for a new military mission.

Still, the U.S. maintains a goal of staying ahead of any other nuclear power that could pose a challenge, according to S. Steve Henry, a Pentagon advisor on nuclear weapons to Defense Secretary Donald H. Rumsfeld. "It is hard to say what kind of a threat we will face in the future," Henry said.

To assuage fears that scientists and military leaders have a hidden agenda to build new classes of bombs, Congress has directed that the new warhead be limited to the same explosive yield as the existing bomb and usable only for the same kinds of targets.

The first design would replace the W76, the warhead used on the submarine-launched Trident missile. The W76 was introduced in 1979 and has maximum explosive power estimated at 400 kilotons of TNT — roughly 27 times more powerful than the bomb dropped on Hiroshima.

Production would require approval by Congress and construction of new manufacturing facilities — all of which would be at least several years off.

Meanwhile, the Los Alamos and Livermore labs are revving up their culture of one-upmanship.

During the Cold War, the scientists adhered to a motto that the Soviet Union was the rival, but the competing lab was "the enemy." Still, it is a scholarly competition with few fighting words.

"I feel we have a great design for the country," said Martz, 41, the Los Alamos program manager who began working at the lab as an 18-year-old college undergraduate. "Ours is better without a doubt."

But Livermore's Goodwin, 55, counters: "We have chosen a particularly effective design. I believe we have done the better job."

Brooks, the federal nuclear weapons chief, gives no hint about whose bomb he favors, saying only that both "are very good designs, very responsive to what we are trying to do."

Though neither lab has developed a new weapon since the late 1980s, they have received billions of dollars in investments by the federal government for office buildings and massive physics machines.

Since the end of the Cold War, the labs' top priority has been to maintain existing weapons. The labs predict that the plutonium components in existing weapons have a life of 45 to 60 years, meaning that in the next 15 years some will begin to deteriorate and replacements will be needed.

Christopher Paine
Christopher Paine

 

Christopher Paine, a program critic and nuclear weapons specialist at the Natural Resources Defense Council, contends the labs have everything to gain from these kinds of assessments — generating funds for a new program even though older weapons remain in perfect condition.

But the labs say their actions are subject to oversight by government agencies and independent boards. "We take the integrity of our job pretty seriously," said Hommert, the Los Alamos division chief.

Though the labs say they don't yet have a cost estimate, they believe the reliable replacement warhead will save money over time. They aren't providing any details.

On average, the U.S. has spent an estimated $6 million per warhead since World War II, said Stephen I. Schwartz, author of "Atomic Audit," a history of strategic weapons costs. Based on that, replacing all of the nation's 6,000 nuclear weapons could cost $36 billion.

So far, a fraction of the ultimate cost of the program has been spent; Congress approved $25 million this fiscal year.

A portion of the cost involves engineering designed to make the bombs more secure. In charge of that is Sandia National Laboratories, which has vowed to ensure that terrorists cannot use a stolen or lost weapon.

"We are setting the goal of absolute control — that you always know where the weapon is and what state it is in and that you have absolute control over its state," said Joan B. Woodard, executive vice president at Sandia. "People will say you can break the bank achieving that goal, but it is the right goal to set."

Los Alamos sits atop a 7,000-foot-high mesa, a half-hour drive from Santa Fe, occupying 43 square miles of pine forests. Livermore has dozens of buildings jammed into a single square mile on the outer edge of the Bay Area, amid rolling hills.

The idea of having two labs compete to design nuclear weapons dates to the 1950s, when federal officials concluded that such a system would promote innovation and also allow the labs to monitor each other's science in an area crucial to national security. The labs are federally funded and operate under contract with the National Nuclear Security Administration.

Each has about 20 physicists, chemists, metallurgists and engineers on its reliable replacement warhead team, backed by a few hundred other experts working part time on the weapon. Among them are younger scientists learning the art and craft of nuclear bomb design from Cold War veterans.

Over the last decade, the labs have invested several billion dollars in computing, creating a succession of the world's fastest supercomputers and other innovations. Livermore has taken the lead in that field. Its "purple" computer, with a footprint the size of a tennis court, does mathematical models of nuclear detonations. It uses enough megawatts of electricity to supply about 4,000 homes with power.

Meanwhile, Los Alamos is developing better ways to cast molten plutonium into hollow spheres, a key part of nuclear bombs, according to Deniece Korzekwa, a casting expert at the lab's manufacturing center.

Each laboratory's culture and body of technology is very different from the other's. Each has developed its own recipes for plastic explosives used to start an atomic chain reaction.

Even in promoting their designs, each lab has taken a different approach.

At Los Alamos, scientists took defense officials inside a "virtual reality cave," where they could walk around and look inside images of the proposed bomb. At Livermore, scientists took a less glitzy approach, building physical models that visiting officials could hold in their hands.

The advanced tools are giving nuclear weapons managers insights into the science of nuclear weapons they never had before.

Last year, the nation's top nuclear weapons managers packed a high-security auditorium at Los Alamos, elbow-to-elbow, and donned 3-D glasses to watch a classified simulation of the new hydrogen bomb.

On a movie-theater-sized screen, powered by a supercomputer, the audience was taken inside the bomb. As it detonated, they were engulfed in the blast.


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Last Updated:
Friday, June 16, 2006 04:18:25 AM

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