Abstract: The short half-life (87.7 yr) of the isotope plutonium-238 makes it ideal for use in radioisotope power systems – nuclear power systems that derive their energy from the heat produced by spontaneous radioactive decay, as distinguished from nuclear fission. ²³⁸Pu has become an important source of power for fuelling NASA unmanned interplanetary spacecraft, and instruments on Mars.  The use of plutonium in space exploration poses interesting policy questions that balance safety against scientific understanding of the solar system. I will provide an overview of the production, safety, component fabrication, and peaceful applications of this very important plutonium isotope.  

About the Speaker: David L. Clark is a Los Alamos National Laboratory Fellow and Director of the Laboratory’s National Security Education Center (NSEC). He joined Los Alamos as a postdoctoral fellow in 1988. Since then he has held various leadership positions at the Laboratory, and become an international authority on the chemistry and physics of the actinides. He has published 170 peer-reviewed publications, encyclopedia and book chapters, and is currently co-editing the 2nd edition of the Plutonium Handbook. He is a CISAC affiliate whose research interests are in the molecular and electronic structure of actinide materials, applications of synchrotron radiation to nuclear security, behavior of actinide and fission products in the environment, the aging effects of nuclear weapons materials, and education and training in actinide science.  

Abstract: Relative to the struggles Western nuclear powered countries have experienced in the recent past, South Korea and China have had notable success building up nuclear power at an impressive scale. China today leads the world in new builds of nuclear reactors. Moving beyond indigenous construction, South Korea is on the verge of completing its first exported power reactor in the UAE, marking an impressive accomplishment for this relatively new nuclear startup. However, China and South Korea now face a challenge other more established nuclear powered countries have yet to solve, an unresolved structure of the back end of the fuel cycle. Despite the uncertainty that exists about the ultimate fate of the spent fuel, the more immediate problem of interim storage is urgent. In this talk, I will review the status and urgency of this problem in the two countries with quantitative results from modeling accumulation, storage and transportation. I will then outline immediate policy mitigations needed in the short term as well as strategies for designing a more permanent solution.

About the Speaker: Rob Forrest is currently a member of the technical staff at Sandia National Laboratories where his research interests include nuclear power, cybersecurity, and nonproliferation. As a member of the systems research group, he specializes in data driven methods and analysis to inform policy for national security.

As a postdoctoral fellow at CISAC, his research focused on one of the most pressing technical issues of nuclear power: what to do with spent nuclear fuel. Specifically, he looked at the more short term issues surrounding interim storage as they affect the structure of the back end of the fuel cycle. He focuses mainly on countries with strong nuclear power growth such as South Korea and China.

Rob’s interest in policy and nuclear issues began during his fellowship in the 2008 Public Policy and Nuclear Threats program at the Institute on Global Conflict and Cooperation at UC San Diego. In 2010, he also participated in the PONI Nuclear Scholars Initiative at CSIS.

Before coming to CISAC in 2011, Rob received his Ph.D. in high-energy physics from the University of California, Davis. Most of his graduate career was spent at Fermi National Accelerator Laboratory (Fermilab) in Batavia, IL where he performed a search for signs of a theory called Supersymmetry. Before beginning his graduate work, Rob spent two years at SLAC National Accelerator Laboratory. In 2001, Rob earned his B.S. in physics from the University of California, San Diego where, throughout his undergraduate career, he worked for NASA. 

Abstract: Since their conception in the 1950s, thorium reactors have been promoted as a promising technology for nuclear energy generation, though they have not yet been successfully commercialized. Proponents of thorium reactors argue that they are safer, produce less waste, and are proliferation-resistant, compared with uranium-fueled light water reactors used around the world today. The central question guiding this research concerns the final claim. Is the thorium fuel cycle inherently more resistant to nuclear weapons proliferation than the traditional uranium fuel cycle?

Advocates argue that the thorium fuel cycle is less vulnerable to proliferation of nuclear weapons technology because little or no plutonium is produced. Additionally, fissile U-233 is claimed to be “self-protected” by U-232, which is produced with U-233 and decays through Tl-208, emitting highly energetic gamma radiation. But the amount of U-232 generated depends on reactor operation. Furthermore, the U-232 content can be further decreased by conducting chemical separations at the back-end of the fuel cycle.

This presentation will discuss the proliferation risks of the thorium fuel cycle. The potential for generating large stockpiles of isotopically pure U-233 by conducting protactinium separations at the back end of the fuel cycle is examined as a new proliferation pathway that current IAEA safeguards may not be prepared to address.

About the Speaker: Eva C. Uribe is a Stanton Nuclear Security Postdoctoral Fellow at CISAC for the 2016-2017 academic year. Her research involves identifying proliferation pathways in the thorium fuel cycle and assessing the potential impact and implications of U-233 stockpile generation on the international nonproliferation regime. Eva received a Ph.D. in Chemistry from the University of California, Berkeley in 2016. Her dissertation research focused on structural analysis of organically-modified porous silica surfaces for the extraction of uranium from aqueous solutions using nuclear magnetic resonance spectroscopy. In 2011 Eva received a B.S. from Yale University with a double major in Chemistry and Political Science. She served as a Next Generation Safeguards Initiative intern with the Nonproliferation Division at Los Alamos National Laboratory in 2008 and 2009.

Abstract: This talk examines ideologies of knowledge and expertise in the global governance of nuclear technology through an ethnographic study of the International Atomic Energy Agency’s Department of Safeguards. It considers how changes in the way that the IAEA carries out international nuclear safeguards have become the subject of increasing controversy in the last 15 years. This controversy provides fertile ground for understanding the role of knowledge and the functioning of bureaucracy in international governance. I will show that the critiques addressed against the new safeguards system reveal not only political alignments and struggles for power, but also uncover global and regional assumptions about how a technical bureaucracy is supposed to produce knowledge. In closing, I will propose how nuclear safeguards might be adapted to a changing security environment without threatening the IAEA's expert authority or politically discriminating against states.

About the Speaker: Anna M. Weichselbraun is a Nuclear Security Postdoctoral Fellow at CISAC. She received her PhD in anthropology from the University of Chicago in August 2016. Anna's dissertation, based on 24 months of ethnographic fieldwork and multi-archival research, investigates how nuclear safeguards inspectors, bureaucrats, and diplomats at the IAEA negotiate the international and institutional boundaries of politics and technology in their working lives. She asks how organizational products such as bureaucratic procedures, technical inspection reports, policy papers, and official diplomatic statements contribute to the logical ordering of technocratic expertise within the IAEA. She is especially interested in how individuals at international organizations communicate across different epistemic paradigms, and how particular types of knowledge become recognized as authoritative and legitimate. In addition to revising her dissertation into a book manuscript, she is also conducting preliminary research on networks of nonproliferation experts and their spheres of influence.