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Fact, Fiction and Faith: The Endless Debate Over Reprocessing

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My testimony before the Reactor and Fuel Cycle Technology Subcommittee of the Blue Ribbon Commission on America’s Nuclear Future (the “BRC”) elicited a predictable and depressing reaction from certain corners of the blogosphere. I informed the Subcommittee that although UCS does not oppose nuclear energy per se, we do oppose reprocessing spent nuclear fuel because of the security, safety and proliferation risks that it poses. I then presented the Subcommittee with a summary of the rationale behind our position, complete with numerous technical references. The UCS position was in direct opposition to that of four of the six members of the panel I was on (representing AREVA, General Electric-Hitachi, Westinghouse and Energy Solutions), who all supported spent fuel reprocessing and “recycling” strategies of one sort or another.

My testimony appears to have given certain bloggers heartburn. Rod Adams of Atomic Insights saw fit to criticize my competence, my understanding of technology and my use of what he called “unsubstantiated statements and vague references.” Yet he was unable to actually point to anything specific in my testimony that he could contradict. Instead, he posted a video clip of my presentation and invited his loyal readers to defend the faith by “dissecting” my testimony.

I would be more than happy to engage Mr. Adams’ readers in a technical debate on these issues, so I thought, frankly, that this was a fine idea. However, two weeks later, it appears that Mr. Adams’ gambit has backfired. Out of twenty comments, only one actually professes any knowledge of any of the references that I cited. Most simply repeat unsubstantiated assertions themselves. Some claim that I must have misinterpreted the references but did not actually bother to look them up. Several are ad hominem attacks on me or UCS. A couple actually agree with some of the points I made. All in all, not a very impressive showing. In fact, I found only two statements that merit a response. Below, I respond to those statements.

Mr. Adams and his readers should rest assured that every statement I make is supported by direct references and transparent analysis. In the future, I’d appreciate that observers interested in a technical debate actually consult my written works and references before throwing darts.

There are three main points to my testimony.

1. Reprocessing spent nuclear fuel has only a marginal impact on the volume of high-level waste requiring disposal in a geologic repository, while significantly increasing the volume of other forms of nuclear waste also requiring secure disposal.

Some reprocessing advocates argue that the technology can reduce the volume of high-level nuclear waste requiring disposal in a geologic repository. On the Atomic Insights blog, Lars Jorgensen says that it is “easy” for any recycling system to significantly reduce waste volume.

However, reprocessing actually increases, not decreases, the total volume of long-lived nuclear waste that must be stored and eventually buried in a geologic repository  It only slightly reduces the volume of high-level nuclear waste that must be disposed of in a repository, as required by the Nuclear Waste Policy Act. At the same time, it significantly increases the volume of “greater-than-class-C” low-level waste, which cannot be legally disposed of in near-surface low-level waste facilities and would therefore need to be buried in a geologic repository as well. In addition, reprocessing increases the volume of low-level waste that must be disposed of in NRC-licensed near-surface facilities. Only one new low-level waste facility has been licensed in the United States in decades, and no policy (not to mention a repository) exists for disposal of GTCC LLW.

According to Argonne National Laboratory data cited by the Energy Department’s 2008 Global Nuclear Energy Draft Programmatic Environmental Impact Statement, compared to the once-through cycle, a fast-reactor-based reprocessing and recycle system would increase the total volume of radioactive waste by a factor of about seven. In particular, reprocessing would generate, in terms of volume,

  • Seven times as much Class A, B and C low-level waste (LLW)
  • 166 times as much greater-than-class-C LLW (over 8,000 cubic meters annually on average)
  • only 25% less high-level waste (HLW)

The last data point conflicts with public statements being made by AREVA, which continues to claim that “recycling reduces by 75% the volume of high-level waste that must be sent to a repository.” However, this assertion is not even supported by AREVA’s own data. According to a 2009 presentation to the Nuclear Waste Technical Review Board, Dorothy Davidson of AREVA indicated that the volume of reprocessing waste requiring geologic disposal (vitrified high-level waste and compacted hulls and end pieces) was 10 cubic feet per metric ton heavy metal of initial spent fuel reprocessed (10 ft3/MTHM). In the same presentation, Davidson claimed that this should be compared a spent fuel volume of 45 ft3/MTHM, so that reprocessing results in a more than four-fold decrease in waste volume.

However, this latter figure is incorrect. As Table S.3-1 shows, the volume of light-water reactor spent fuel is actually closer to 15.8 ft3/MTHM (0.45 m3/MTHM). Therefore, the HLW volume per MTHM according to AREVA’s own data is only about 37% less than the initial volume of spent fuel – a much less impressive reduction than the 75% cited by AREVA, and one much closer to the Argonne/DOE estimate. Apparently, this discrepancy stems from the fact that AREVA did not directly compare the volume of HLW to the volume of spent fuel, but compared the volume of HLW to the volume of the spent fuel waste disposal package that was originally considered for the Yucca Mountain repository, which had a significant amount of empty space. This is not an apples-to-apples comparison.

But in any event, heat load, not volume, is typically the limiting factor in a geologic repository. If plutonium and other transuranic elements such as americium are removed with very high separation factors, the heat load of the residual waste will be reduced. However, unless the actinides that are removed from the spent fuel are actually destroyed through fission in a reasonable period of time, they will have to be stored for an indefinite period (posing many of the same concerns as indefinite interim storage of spent fuel), and eventually will have to be disposed of in a repository. Yet as the discussion in the next section indicates, reprocessing and transuranic recycle systems are not capable of significantly reducing total actinide inventories in a reasonable period of time.

2. Reprocessing and recycling spent nuclear fuel, whether in thermal or fast reactors, cannot effectively reduce the total quantity of hazardous radionuclides like plutonium and other transuranic elements that would require disposal in a repository.

Numerous studies have shown that fast reactor (FR) recycle systems are very slow and inefficient in actually fissioning transuranic elements, even if they operate in burner mode with very low conversion ratios. A recent study by the Electric Power Research Institute (EPRI) and Electricité de France (EdF) examined the impact of phasing in a fast reactor system operating in tandem with light-water reactors (LWRs) (35 percent FRs and 65 percent LWRs) and operating at a conversion ratio of 0.5, while keeping constant the total U.S. nuclear generating capacity. [1] The study found that the total inventory of plutonium and other transuranics would increase to over 1500 metric tons – roughly three times today’s inventory – and would remain essentially constant after that. Thus the system is simply not capable of reducing the total transuranic inventory, and the popular image that such a system can “burn up” nuclear waste is simply not accurate.

The EPRI study also compares the transuranic inventory in the system to the inventory that would accumulate in spent fuel if the U.S. continued with the once-through cycle. The analysis finds that the system would have to operate for 70 years just to reduce the total inventory of transuranics in the system by 50 percent relative to the once-through inventory. To reduce the inventory by 90 percent would require continuous operation for 632 years. Thus the system of reprocessing plants, fuel fabrication plants, fast reactors and associated facilities would have to operate over a period spanning many generations – and be rebuilt many times – before it could achieve a significant reduction in actinide inventory and a significant decrease in repository heat load compared to the once-through cycle. The paper concludes that “the analysis for the specific [recycling] scenario considered shows that it would take many decades, even centuries, for significant waste management benefits to materialize.” This is consistent with the one of the conclusions of the MIT study “The Future of the Nuclear Fuel Cycle,” released earlier this week – namely, that the choice of fuel cycle would make “little difference” in the total transuranic inventory in this century.

Proposals that require the essentially indefinite reprocessing and recycling of spent fuel do not provide a suitable foundation of nuclear waste management because they are inconsistent with the “intergenerational equity” principle. This principle, which underlies the rationale for a geologic repository for nuclear waste, includes the provisions that (1) those who generate the wastes should take responsibility, and provide the resources, for the management of these materials in a way which will not impose undue burdens on future generations; and (2) that a waste management strategy should not be based on a presumption of a stable societal structure for the indefinite future, nor of technological advance; rather it should aim at bequeathing a passively safe situation which places no reliance on active institutional controls.

A system that would require hundreds of years of costly and complex operations to achieve only a modest reduction in repository space requirements is not consistent with these principles. Some reprocessing advocates argue that nuclear materials that are in the fuel cycle – that is, in reactors, fuel fabrication plants, and above-ground storage facilities – need not be counted as wastes. This is only true, however, as long as the system is running. If it shuts down for any reason, these materials will require secure disposal. Thus our generation would be bequeathing to future generations the obligation of keeping the system going, without regard to cost or risk. This is clearly inconsistent with intergenerational equity.

3. Advanced reprocessing technologies do not significantly reduce nuclear proliferation and nuclear terrorism risks relative to current reprocessing technologies that produce separated plutonium.

Energy Secretary Chu has spoken of the proliferation risks associated with conventional reprocessing technology, as practiced in France and Japan, and has expressed confidence that the U.S. can develop alternatives that are “proliferation-resistant.” One of the goals of the Bush Administration’s Global Nuclear Energy Partnership program (GNEP) was also to develop so-called proliferation-resistant reprocessing technologies that did not produce “separated” plutonium.

However, a study conducted by the nuclear weapons labs reviewed the entire suite of technologies that were under study, including modified aqueous reprocessing and pyrometallurgical processing (“pyroprocessing”), with regard to their potential for reducing proliferation concerns. [2] The study found that the products of these processes, mixtures of plutonium and other actinides such as neptunium, americium and curium, are attractive for use in nuclear weapons or nuclear explosive devices. It concluded that there is no “silver bullet” technology that would eliminate the safeguards and security issues associated with reprocessing, and also that “none of the proposed flowsheets examined to date justify reducing international safeguards or physical security protection levels. All of the reprocessing or recycling technologies evaluated to date still need rigorous safeguards and high levels of physical protection.”

It should be noted that this study only analyzed the direct usability of these materials in nuclear weapons without further processing. It did not consider the potential for theft and off-site purification of these materials. As we and our colleagues have noted at length elsewhere, alternative reprocessing technologies under consideration do not confer significant self-protection against theft.

If stolen, these materials could be readily processed to produce even more attractive materials for weapons use.

One of the Atomic Insights blog post replies (Steve Skutnick, September 3), claimed that I misrepresented Bathke’s study. Skutnickasserted that the statements I made regarding the study’s conclusions with regard to subnational groups (terrorists) actually applied only to state-level actors. However, Skutnickis wrong. If he had actually read any of Bathke’s reports, he would have learned that the so-called Figure of Merit (FOM1) that I used “is applicable for evaluating the attractiveness of SNM or ANM for a sub-national group, for most of the less advanced proliferant nations, or for a technically advanced proliferant state.”

The other Figure of Merit (FOM2), which Mr. Skutnickasserts is designed for a “sub-state level actor,” is actually intended only “for a very few relatively unadvanced proliferant nations that desire a reliably high yield.” Thus Mr. Skutnickis wrong in attacking me for “abusing such metrics.”

Notes:

[1] A. Machiels, S. Massara and C. Garzenne, “Dynamic Analysis of a Deployment Scenario of Fast Burner Reactors in the U.S. Nuclear Fleet,” Proceedings of the Global 2009 Conference, Paris, France, September 8-11, 2009, pp. 2567-2574. Also cited in the testimony of J. Kessler, EPRI, to the July meeting of the Reactor and Fuel Cycle Technology Subcomittee of the Blue-Ribbon Commission.

[2] C. Bathke et al., “An Assessment of the Attractiveness of Material Associated with a MOX Fuel Cycle From as Safeguards Perspective,” 50th Annual Meeting of the Institute of Nuclear Materials Management, Tucson, AZ, July 2009.

Posted in: Nuclear Terrorism Tags: , ,

About the author: Dr. Lyman received his PhD in physics from Cornell University in 1992. He was a postdoctoral research scientist at Princeton University's Center for Energy and Environmental Studies, and then served as Scientific Director and President of the Nuclear Control Institute. He joined UCS in 2003. He is an active member of the Institute of Nuclear Materials Management and has served on expert panels of the Nuclear Regulatory Commission. His research focuses on security issues associated with the management of nuclear materials and the operation of nuclear power plants, particularly with respect to reprocessing and civil plutonium. Areas of expertise: Nuclear terrorism, proliferation risks of nuclear power, nuclear weapons policy

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