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Medical Isotope Production without Highly Enriched Uranium
substantial progress has been made in converting HEU-fueled reactors to LEU fuels. New technologies for LEU-based production (i.e., targets and processing) of Mo-99 have been developed by ANL and tested by some small producers. However, these technologies have yet to be adopted by large-scale producers of Mo-99.
Minimization of the commerce in civilian HEU and its use in research reactors worldwide, together with the return of research reactor spent nuclear fuel and HEU waste from isotope production to safe and secure facilities in their countries of origin, will help to reduce proliferation risks. The committee finds that the GTRI has made substantial contributions to these minimization and return goals: The period 1978–2004 was marked by slow but steady progress, whereas progress accelerated during the period 2004 to the present. The committee recommends that the GTRIbe continued until research and test reactors worldwide have converted fueland targets to LEU or permanently shut down and their HEU fuel has beenreturned to the country from which it originated.
Despite these successes, the committee finds that the program faces several challenges. First, the startup and continued operation of the HEU-fueled FRM II reactor in Germany sets an unfortunate precedent for possible future construction of HEU-fueled research reactors. Second, there are 78 HEU-fueled research and test reactors operating throughout the world that are out of scope of GTRI. The majority of these are old and by the end of the current GTRI program their numbers are likely to be much fewer. Nevertheless, from a purely technical perspective, it is difficult to understand why most of these reactors cannot be converted. The committee recommendsthat DOE-NNSA, in cooperation with IAEA, make an effort to maintain anup-to-date and comprehensive database of the research and test reactors ofthe world, including large pulse reactors, critical facilities, and reactors witha defense-orientated mission.28The committee also recommends that thesereactors should be investigated to determine if it is feasible to convert themto LEU; if so, they should become in-scope for the program.
Finally, the committee finds that converting Mo-99 production worldwide to LEU will continue to be a major challenge for the reasons described in detail elsewhere in this report. Chapter 10 lists some actions that DOE and other parties can take to accelerate the conversion to LEU-based Mo-99 production. The committee recommends that the RERTRincrease its focus on eliminating the HEU wastes from Mo-99 productionfrom U.S.-origin HEU, by examining options for downblending this wasteor encouraging its return to the United States.
These reactors do not include HEU-fueled naval propulsion reactors or related test beds and training reactors.