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PREVENTING NUCLEAR TERRORISM PREPARED TESTIMONY OF CHRISTOPHER
E. PAINE HEARING
OF THE NATIONAL SECURITY, September 24, 2002
Mr. Chairman and Members of the Committee: My name is Christopher Paine, and I am a Senior Analyst in the Nuclear Program of the Natural Resources Defense Council (NRDC), Washington, D.C. I appreciate the opportunity today to present NRDC’s views on strategies for preventing nuclear terrorism. Mr. Chairman, you asked us to address a broad set of questions regarding the threat of nuclear terrorism. This statement addresses those dimensions of the problem that are within our areas of expertise. This expertise involves the fundamental characteristics, vulnerabilities, and effects of nuclear energy systems and explosives, and really does not extend to the capabilities of known terrorist organizations to acquire or develop nuclear weapons. With that caveat, let me summarize briefly what we at NRDC see as the fundamental technical ground truths regarding the risks of nuclear terrorism, and whether current US and international policies are doing enough to address these fundamental risks. At the broadest level of analysis, we discern five complementary approaches to reducing the risk of nuclear terrorism: Nuclear Materials Elimination, Access Denial, Controlled Use under Enhanced Safeguards, Interdiction, and Preemption. All these approaches need to be pursued in some measure, Mr. Chairman, but from both the technical and political perspectives, they are not all equally effective in reducing risks. We are concerned that current policies strike the wrong balance, and are therefore far less effective than they could be. In roughly descending order of technical effectiveness, I would summarize the range of plausible policy approaches as follows:
Ironically, if one considers the above five approaches from the perspective of current political effectiveness or political will, then one finds that the rank ordering above is nearly reversed. That is, the technical approaches least likely to succeed are the ones attracting all the attention and funding. There is now a great political head of steam behind nuclear risk reduction strategies that emphasize preemption – possibly involving even preemptive use of U.S. nuclear weapons – and increased border security. Not nearly enough attention is being paid, in our view, to reducing dependence on diversion-prone nuclear fuel cycles, and to better controlling – or better yet eliminating – nuclear weapons materials at the source, before they are produced, stolen, or diverted. “Dirty Bombs” are Not Nukes. When considering whether terrorists could acquire a radiological or nuclear weapon, the risks involved should not be equated. There are considerable differences between a nuclear weapon and a radiological weapon in terms of availability of nuclear explosive and radiological materials, the ease in fabrication, and the likely consequences if used. A one-kiloton nuclear explosive device, if detonated in a dense metropolitan area, could kill upwards of 100,000 people. The consequences of detonating a radiological weapon, a so-called “dirty bomb,” will depend on several factors, including most importantly the type and amount or radioactivity employed. With a few exceptions, the direct fatalities are likely to be dominated by the blast from the chemical high explosive used to disperse the radioactivity. The economic consequence due to radiological contamination could be small or large, depending on the type of device and its placement, but the economic consequences are likely to be less than those of a nuclear explosive device detonated at the same location. Consequently, a higher priority should be given to preventing non-nuclear weapon states of concern or terrorists from acquiring nuclear weapons, as opposed to “dirty bombs.” Too much uncertainty persists about the size and disposition of the former Soviet nuclear stockpile. There is no evidence in the public record that anyone has attempted to steal a nuclear weapon from a weapon storage facility in Russia, but you may in the course of your investigation want to consult the intelligence community on this question. Most, but not all, Russian nuclear weapons are too heavy to be carried by a single individual acting alone. Some tactical nuclear weaponsľfor example, some types of artillery shells and atomic demolition munitionsľcan be carried by one or two individuals. The U.S. nuclear weapons stockpile used to include the W48, a 155-mm artillery shell that weighed about 120 pounds and had a yield of about 100 tons, and the W54, an atomic demolition munition that weighed about 60 pounds and had a yield range of 10 to a few tens of tons of chemical explosive equivalent. It is not know how many similar warheads remain intact in the Russian nuclear weapon stockpile, or in inactive storage, or indeed whether all such Soviet-era weapons were retrieved from Eastern Europe and Central Asia and are all presently accounted for in one form or another. We do not know this because, despite the Biden Condition added by the Senate in 1992 as a binding condition on ratification of the START I Treaty, both the U.S. and Russian governments have resisted a bilateral data exchange that would identify the number, type and location of all nuclear warheads in Russia and the United States. Even more unfortunate, the Moscow Treaty signed by Presidents Bush and Putin does not require the elimination of a single nuclear warhead, or nuclear warhead component, over the next ten years in Russia or the United States, and it has no provisions for identifying or controlling the number of non-strategic nuclear weapons, including Russian tactical nuclear weapons. This Administration has demonstrated that it is more interested in preserving a bloated U.S. nuclear weapons stockpile, currently numbering some 10,000 intact nuclear devices, than in eliminating the proliferation and terrorist threat represented by Russian stocks of strategic and non-strategic nuclear warheads. To reduce both immediate and longer term risks, NRDC believes a much higher priority should be given to seeking a bilateral agreement to verifiably account for total Russian and U.S. warhead and fissile material production, and to steadily eliminating all but a few hundred nuclear warheads in Russia and the United States. Theft of Weapon-Grade Material from Non-Weapon Facilities is a Major Concern. Nuclear weapons are maintained under tighter security than the nuclear explosive materials contained in Russia’s naval-fuel and civil-research sectors. This is no doubt true in other nuclear weapon states as well. But there have been several cases in which individuals or groups of individuals have sought to steal weapon-usable materials from the naval fuel facilities and civil nuclear research institutes in Russia. In some cases the individuals were apprehended after the nuclear material was removed from the facility or institute, and in some cases after it was removed from Russia. Fortunately, to date, no known cases involved large quantities of weapon-usable nuclear materials, but at least one incident involved a quantity of HEU (3 kg) that, in the hands of skilled designers and fabricators, could have produced a nuclear yield in the range of hundred tons to a kiloton of fission yield. Had the amounts involved in these separate episodes been combined in a single explosive device, the yield of the resulting device could significantly exceeded one kilton. Explosive nuclear materials, namely, plutonium and highly enriched uranium, if diverted to a non-weapon state, could reduce the time to acquire nuclear weapons from years to weeks. The diversion of a few tens of kilograms of plutonium or highly enriched uranium could suffice for a small nuclear arsenal, not just a single weapon. There are two classical methods used to assemble first generation fission weapons: the gun assembly and implosion techniques. The implosion technique is more efficient, requiring considerably less fissile material to achieve the same explosive yield. For example, the Fat Man device, tested at Trinity and dropped on Nagasaki, was an implosion weapon that used 6.1 kilograms of plutonium and had a yield of about 20 kilotons, whereas Little Boy, dropped on Hiroshima, was a gun-assembly that used 64 kilograms of highly enriched uranium and had a yield of about 15 kilotons. The fourth Chinese nuclear weapon test was of an implosion device that used about 25 kilograms of highly enriched uranium, and it had a yield of about 12 kilotons. China reportedly provided this design to Pakistan. Assuming the availability of the fissile material, it is more difficult to fabricate an implosion device than a gun assembly device. However, if either plutonium or highly enriched uranium were diverted to a non-weapon “state of concern,” an implosion weapon could be fabricated using the full scientific and economic assets available to the government involved, including precision casting equipment and numerically-controlled machine tools. While it appears far more likely that this government would retain such weapons for its own use, or use its own agency for delivery, it is at least conceivable that a country could rely on a terrorist network for delivery and detonation of the device. In the specific instance of Saddam Hussein and al Qaeda, given the history of antagonism between Islamic jihadists and the decadent, secular Baathist regime in Baghdad, the only circumstance in which this feared “nexus” might conceivably occur is the one President Bush seems determined to create, in which an egomaniacal dictator under siege thinks he has nothing to lose and seeks to wreak vengeance on those who are toppling him. And this line of inquiry leads one to ponder the following contradiction: the Bush Administration argues that the threat of Saddam’s (unprovoked) nuclear or bio-weapon aggression against the U.S. is sufficiently imminent to justify prompt military intervention, but not so imminent as to justify fears of a vengeful response via a terrorist network when his regime is on in the verge of defeat. The only way the Administration could seize upon the former risk while discounting the latter is if it had detailed intelligence indicating that Saddam’s regime does not yet have the capabilities, or the terrorist “nexus” for WMD delivery, which it now claims are the proximate cause of America’s need for “preemptive self-defense.” In that case, there is time for an intrusive inspection regime to be put in place. In the alternative, the risk of retaliation via the “WMD-terrorist nexus” could actually be higher than the Administration is admitting publicly, in which case the Congress ought to look very carefully at the wisdom of giving the President a blank check to wage war against Saddam. I do not know where the truth actually lies, but I am not sure the Administration does either, which I find worrisome. Either Congress and the public have been subjected to a certain amount of disinformation regarding the imminence of the Iraqi threat, or the Administration is embarked on a bit of a gamble that could end very badly for some innocent civilians in Israel, the U.S., or Western Europe.. Mr. Chairman, returning to the technology of the nuclear threat, both the implosion and the gun assembly techniques could be used to fabricate a crude low-yield nuclear explosive device using either plutonium or uranium. If plutonium were used in a crude gun assembly device the yield most likely would be substantially less than a kiloton, but it could be larger than the explosion that destroyed the Federal Building in Oklahoma City. Consequently, to prevent the terrorist seizure, theft, or clandestine diversion of weapon-usable highly enriched uranium and separated plutonium, a high priority should be assigned to phasing out their use in civil research and test reactors, civil power reactor programs, and ultimately, naval nuclear fuel cycles. Current International Safeguards Criteria are Technically Inadequate. If the implosion assembly technique is used a low-yield nuclear explosion can be realized with considerably less plutonium than was used in Fat Man. A one-kiloton explosive device can be fabricated with just over one kilogram of plutonium or about 3 kilograms of highly enriched uranium. The International Atomic Energy Agency (IAEA) defines a “significant quantity” (SQ) of nuclear material as “the approximate quantity of nuclear material in respect of which, taking into account any conversion process involved, the possibility of manufacturing a nuclear explosive device cannot be excluded.” The SQ value used by the IAEA for direct use plutonium is 8 kilograms, and for direct use high-enriched uranium is 25 kilograms. These values are technically wrong and are in error (too high) by a factor of about eight. As a consequence of using incorrect, non-conservative, SQ values, IAEA safeguards are far less stringent than they should be. This is particularly troubling at bulk handling facilities, such as reprocessing facilities and plutonium and highly enriched uranium fuel fabrication plants, where measurement of material quantities is imprecise. Many nuclear facilities that are operating today could not continue to operate if the IAEA and nuclear regulatory agencies required that the diversion of a significant quantity of nuclear material could be detected with high confidence in time to prevent its incorporation into a nuclear device. NRDC tried to get the IAEA to correct the SQ deficiency in 1995 by petitioning the IAEA and the United States government to make the necessary changes. We were thwarted by the IAEA and the State Department, which claimed that using technically correct safeguards requirements would lead to an inefficient allocation of the limited financial resources available to the IAEA. In light of the post-September 11th concerns, the United States and other wealthy nuclear industrial states should place pressure on the IAEA to substantially reduce the SQ values, and if necessary, assume the added financial burden this imposes on the IAEA. Table 1. Approximate
Fissile Material Requirements
Interdiction is a Tool, not a Solution. Some radioactive materials are relatively easy to detect with the x-ray and radiation detection equipment currently being deployed by U.S. Customs and other authorities at border control points. For other radioactive materials, detection can be exceedingly difficult. U.S. Customs officials will be able to catch unsophisticated smugglers, but relative sophisticated smugglers will be able to beat the system. This is particularly true with regard to weapon-usable highly enriched uranium, as was demonstrated recently by an ABC News simulated smuggling experiment. In early June, NRDC loaned ABC News a 15-pound (6.8-kilogram) cylinder of depleted uranium metal for the purpose of conducting an experiment resembling nuclear smuggling. ABC News wanted to test the effectiveness of security procedures at U.S. and other national bordersľand it found them wanting. In sum, the network found that the United States is ill equipped to stop terrorists from smuggling certain types of nuclear materials into the country. ABC first shipped the depleted uranium cylinder by air from the United States to Vienna, and transported it by train through Hungary, Romania and Bulgaria to Istanbul. ABC then shipped it as ocean freight back to New York.
TABLE 2. Technical
Realities Confronting Strategies to Reduce
U.S. Customs inspected the shipping container at Staten Island. After the inspection, ABC transferred the container to Brooklyn, and stored the contents at Pier One at the foot of the Brooklyn Bridge. Officials failed to detect the uranium at every checkpoint. U.S. Customs officials x-rayed the shipping container at Staten Island, but were not able to identify the depleted uranium cylinder in its shielded container. Although the material was relatively harmless depleted uranium, the experiment demonstrated that weapons-grade uranium with the same or only slightly more shielding also would have sailed through without being detected. The nuclear smuggling problem is not going to be solved by increasing border security, going to war with Iraq, or jailing al Qaeda suspects. The only effective means to significantly reduce the risk of smuggling weapons-grade uranium is to eliminate use of the material wherever possible, and maintain extremely tight security over the remainder. For many areas of the world, particularly in Russia, it has proven difficult to provide adequate security for weapon-usable highly enriched uranium (and separated plutonium) in the civil and naval propulsion sectors. Thus, ultimately, the only effective way to prevent the unauthorized use of weapon-usable uranium is to blend existing stocks of highly enriched uranium into low-enriched uranium, which is not directly weapon-usable, and to prohibit the future commercial use of highly enriched uranium. The United States has in place programs to:
Unfortunately, these programs are moving ahead at a pace that is far slower than they should be moving, a pace that is well nigh inexplicable in the wake of Sept. 11. The third program – research reactor conversion – is voluntary for reactor owners, and consequently many reactors continue to rely on highly enriched uranium fuel. Even the United States refuses to lead by example by promptly converting all of its research reactors to low-enriched fuel. Congress and the Administration should take immediate steps to eliminate the use of highly enriched uranium in U.S. research reactors and insist that other countries follow suit. Some Misguided Programs Are Actually Increasing the Risk of Nuclear Terrorism. The Bush Administration and the Congress are pursuing several policies and programs that are likely to increase the risk that nuclear explosive materials will be diverted for unauthorized purposes, including possible use against American citizens. For example:
Mr. Chairman, this provision is lunacy. It’s a sneak attack on longstanding US policy opposing weapons-usable nuclear materials in the commercial nuclear fuel cycle. It should be stricken from the final bill, before some misguided souls in DOE go out and do even more damage than the old Atomic Energy Commission, when it proliferated nuclear weapons materials and technology around the world in the 1950’s and sixties under the slogan “Atoms for Peace.” More than 25 years ago, the Ford Administration determined that separation of plutonium from spent nuclear fuel (i.e."reprocessing") and its fabrication into "mixed oxide" fuel elements present unacceptable risks of diversion to nuclear weapons use by terrorists and nuclear outlaw states. With their huge inventories of radioactive materials, the plutonium separation and fuel fabrication plants themselves present, not just a potential source of diverted weapons material, but also an especially damaging target for terrorist sabotage and attack. Reprocessing not only introduces large amounts of separated plutonium into nuclear commerce, but it also fosters the creation of a new cadre of experts trained in sophisticated plutonium chemistry and metallurgy who can then transfer their expertise to non-nuclear states and terrorist organizations. In light of the known attempts by al Qaeda, Iraq, and other enemies of the Unites States to obtain nuclear materials for weapons, the bill's sponsorship of increased plutonium use in the commercial sector is egregiously irresponsible. In conclusion, Mr. Chairman, to reduce the threat of nuclear terrorism, we recommend a policy that combines elements of all five major strategic approaches, but is weighted toward stepped-up elimination and access denial, rather than a preemptive attack strategy based on a presumed imminent nexus between nuclear rogue states and terrorist organizations. If the Administration and the Congress are genuinely concerned about reducing the risk of nuclear terrorism, they will work together to:
NOTE: Source: T.B. Cochran and C.E. Paine, The Amount of Plutonium and Highly-Enriched Uranium Needed for Pure Fission Nuclear Weapons, Nuclear Weapons Databook monograph series, Natural Resources Defense Council, Washington, D.C., April 1995.
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