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HOME > BOOKS > Nuclear Weapons Materials Gone Missing: What Does History Teach?      

Nuclear Weapons Materials Gone Missing: What Does History Teach?
Published on: Nov 2014

In 2009, President Obama spotlighted nuclear terrorism as one of the top threats to international security, launching an international effort to identify, secure, and dispose of global stocks of weapons-usable nuclear materials—namely highly enriched uranium and weapons-grade plutonium. Since that time, three nuclear security summits have been held, along with scores of studies and workshops (official and unofficial), drawing sustained high-level attention to the threat posed by these materials. However, little attention has been given to incidences where sensitive nuclear materials actually went missing. This volume seeks to correct this deficiency, examining incidences of material unaccounted for (MUF) arising from the U.S. and South African nuclear weapons programs, plutonium gone missing from Japanese and British civilian production facilities, and a theft of highly enriched uranium from a U.S. military contractor in the 1960s that was used to help fuel Israel’s nuclear weapons program. This volume also questions the likelihood that the International Atomic Energy Agency would be able to detect diversions of fissile materials, whether large or small, and the likelihood that a state could or would do anything about the diversion if it was detected. What emerges from this book is an assessment of how likely we are to be able to account for past MUF quantities or to be able to prevent future ones.

This book is published online by the U.S. Army War College's Strategic Studies Institute, where it is possible to order hard copies.

Published by:

The Strategic Studies Institute Publications Office, United States Army War College

Edited by NPEC executive director, Henry Sokolski - 2014

Download the complete edition

Table of Contents



        Henry Sokolski

Part I

           Charles D. Ferguson 
            Thomas B. Cochran and Matthew G. McKinzie

Part II

            Victor Gilinsky
            Leneoard Weiss

Part III

            Alan J. Kuperman, David Sokolow, and Edwin S. Lyman
            Ryan A. Snyder

Part IV

            Jodi Lieberman
                 Olli Heinonen


Chapter 1

Materials Unaccounted For: Nuclear Weapons Materials Gone Missing

Henry Sokolski

Ever since President Barack Obama made securing nuclear weapons assets a top priority for his global arms control agenda, guarding and disposing of these holdings have become an international priority. Every 2 years, high-profile nuclear summits on how to prevent nuclear theft and sabotage have been held—the first in Washington, DC; the second in Seoul, South Korea; and the third in The Hague, the Netherlands. With each summit, more and more states have agreed to dispose of what weapons-grade nuclear fuels they have. In between these meetings, scores of studies have been commissioned and nearly as many workshops (official and unofficial) have been held. Yet, in all of this, almost no attention has been focused on what to do about the nuclear weapons-usable plutonium and highly enriched uranium that we have lost track of. This is odd.

Although the exact quantities of materials unaccounted for (MUF) are unknown, there is no doubt they are significant. U.S. nuclear weapons MUF alone is pegged at nearly six tons—i.e., enough to fashion at least 800 low-tech, multi-kiloton bombs. Russian MUF figures are assumed easily to be as large. As for Chinese, Indian, Pakistani, Israeli, and North Korean MUF figures, though, we have only a general idea of what they might be. The civilian production of nuclear weapons-usable plutonium in the United States, United Kingdom (UK), Japan, France, and India also is a worry. We know that specific accounting losses in the case of civilian plutonium reprocessing and fuel making in the UK and Japan have been significant—measured in scores of bombs worth. What they might be elsewhere, again, is unknown.

As for the possibility of military diversions, we now know that some of what was categorized as MUF has been spirited away to make bombs. In specific, at least 100 kilograms (kg) (and possibly much more) of U.S. weapons-grade uranium was stolen from a defense contractor in the 1960s to help fuel Israel’s nuclear weapons program. Fortunately, the two largest fissile material producers, the United States and Russia, stopped making nuclear weapons-usable plutonium and uranium. Also, a small portion of the U.S. and Russian surpluses of these materials have been disposed of.

This helps at least cap the growth in MUF uncertainties. Also, so far, besides the Israeli case, there are no known cases of large nuclear thefts. Presumably, they would have become known by now. Finally, there is some solace in knowing that U.S. nuclear material accounting practices are now improved over those used during the Cold War.

Unfortunately, none of this helps answer precisely how much MUF has been produced or the extent to which we can prevent the generation of more MUF. Without these answers, reducing or capping existing nuclear weapons arsenals and blocking future nuclear proliferation must remain iffy propositions.

How likely is it that the International Atomic Energy Agency (IAEA) could detect a large amount of MUF in a timely fashion even at declared civilian nuclear sites? What of its ability to detect smaller, incremental diversions? What of national means of detection? What can we learn from the history of civilian MUF discoveries in Japan and the UK and of military MUF in the United States and South Africa? How well can the IAEA or any existing nuclear material accountancy system track the production of special nuclear material or account for past production? What do the answers to these questions suggest with regard to the prospects of eliminating nuclear weapons and nuclear weapons material stockpiles?

As this volume makes clear, the answers are mixed at best. In the case of U.S. MUF, the discoveries of tons of material missing came well after the United States originally lost track of the material. Most of it has yet to be accounted for. The South African case remains a debate between analysts that trust what South African officials have claimed and those that still worry about persisting accounting discrepancies. In the few known IAEA MUF cases, there still are material balances outstanding that are quite large. More important, the IAEA privately admits that its ability to track production of nuclear fuels and to find covert nuclear enrichment and reprocessing plants is limited. None of this augurs well for the future. As for accounting for past production, there are clear limits.

A much larger question, of course, concerns enforcement: What, if anything, has been done when nuclear security understandings have been violated or there have been discoveries of significant amounts of MUF? In important cases, has the United States or other major states chosen to act or avert their gaze? Again, what history we have offers answers that are hardly encouraging. Too often and more often than not, the United States and its allies have averted their gaze from intelligence that lends credence to military diversions.

This volume focuses on all of these issues. Much of the analysis is technical. Most of it, technical or not, is downbeat. The good news is that this is the first dedicated volume on this specialized topic. What questions we cannot answer now may have answers with further analysis. The key message of this volume, however, is one of limits. We may never know where considerable amounts of nuclear weapons-usable material went. More important, the amount of MUF will only grow unless we do more to limit continued, unnecessary civilian and military material production. Whether or not that recommended limit will be recognized and honored remains to be seen.


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founded in 1994 to promote a better understanding of strategic weapons proliferation issues. NPEC educates policymakers, journalists,
and university professors about proliferation threats and possible new policies and measures to meet them.
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