This story has been corrected.
Since the start of the Manhattan Project in 1942, the world has accumulated 1,875 tons of nuclear explosive materials, the equivalent of tens of thousands of enormously powerful bombs. An estimated 25 countries hold these materials today at hundreds of sites, sometimes in facilities with questionable security.
Terrorists could engineer a devastating attack against a civilian population or a large military installation merely by gaining access to a few pounds of these materials, because the designs of simple nuclear weapons are no longer secret. A stock of enriched uranium the size of a six-pack is all they would need to fuel a crude bomb as powerful as the one that destroyed Hiroshima in 1945.
Anxious officials in the United States have sought as a result to eliminate or at least better secure stocks of nuclear explosive materials around the world, with mixed results.
Some governments have balked at reducing or eliminating their stocks, arguing that the materials are important economic assets they have a right to keep. Some have resisted adopting stringent standards for securing their nuclear explosives, saying that rigorous precautions are unnecessary, too expensive and a barrier to the development of peaceful nuclear programs.
The United States, meanwhile, has mismanaged some of its domestic efforts to secure or reduce its own stockpile of nuclear explosive materials.
The Center for Public Integrity has been investigating the global effort to control dangerous nuclear explosives. Our aim is to shine a light on the gravest risks today, and on secretive but sometimes unsuccessful efforts to secure these materials.
We’ve already published two sets of stories in this project, and a third series is scheduled to be published next week. In the initial pieces, we examined the financial, technical and political problems that afflict a longstanding U.S. and Russian plan to destroy 68 tons of surplus, Cold War-era weapons plutonium.
The second series detailed controversy over Japan’s construction of one of the world’s largest plutonium factories, a facility producing materials with no immediate use. U.S. officials have complained privately that the site is not adequately protected from a terrorist assault.
Here is a primer on this topic in anticipation of the third series of articles:
The Obama administration has since 2009 devoted significant attention to enhancing the security of nuclear materials, an initiative the President hailed as the best way of addressing “the most immediate and extreme threat to global security.” He’d promised as a candidate that all vulnerable materials would be locked up by the end of his first presidential term. So is this really still a problem?
The White House effort — which built on a Bush administration program launched in 2004 — has substantially reduced the number of countries that hold threatening fissile materials. Under U.S. prodding, from 2012 to last year alone, seven countries completely eliminated all stocks of their weapons materials.
But nine nuclear weapons states still hold enormous stockpiles, and ten more nations that don’t have nuclear weapons still have enough fuel to build one. The White House has focused on civilian stocks of highly-enriched uranium, rather than on the much larger and more politically sensitive military stocks. And the administration has paid less attention to reducing global stockpiles of plutonium, which are large and growing.
So where is this material, for the most part?
More than 90 percent of the world’s highly-enriched uranium and plutonium are still held by Russia and the United States.
Together, these two countries have about 1,460 tons of the stuff. And that’s what remains after Russia converted 500 tons of highly-enriched uranium into benign reactor fuel, and sold it to the United States for $17 billion — in perhaps the most successful nuclear nonproliferation program ever attempted.
Other weapons states — France, Germany, the United Kingdom, China, India, Pakistan, Israel and North Korea — also hold large stocks of nucl