Issue
In order to ensure that patient needs are not compromised, a continuous reliable supply of medical radioisotopes is essential. Any change from highly enriched uranium (HEU) to low enriched uranium (LEU) must ensure that patient needs are not compromised. Currently, there are no facilities in the U.S. that are dedicated to manufacturing Mo-99 for Mo-99/Tc-99m generators. The United States must develop domestic capabilities to produce Mo-99, and not rely solely on foreign suppliers.
Background
Over the past two years, SNM has become increasingly disturbed about supply interruptions of Mo-99 from foreign vendors and the lack of a reliable supplier of Mo-99 in the United States. As of February 2009, both the National Research Universal (NRU) and the High Flux Reactor (HFR) reactors are back online; however, this does not negate the need for a reliable domestic supply of medical radionuclides.
Of those sources located within the U.S., SNM has identified two as being the most viable solutions to provide a domestic supply of medical radionuclides: the University of Missouri Research Reactor Center (MURR) in Columbia, Missouri, and in the longer-term, the Babcock & Wilcox (B&W)- Covidien collaboration.
MURR could meet approximately 50% of the current market need for Mo-99, with little change to the current reactor. MURR is currently working on the design of a processing center that will be located adjacent to the reactor building. The new processing center would be solely owned by the University of Missouri, however a funding source has not yet been obtained. SNM recommends that the Department of Energy's (DOE) National Nuclear Security Administration (NNSA) fund the construction and development of the processing capability, especially since the major thrust of the NNSA is to demonstrate a high-level production path using LEU. Since the U.S. represents over one-half of the world's need for Mo-99, success at MURR and by Babcock & Wilcox (discussed below), would immediately reduce the amount of HEU that is now exported by the U.S. for Mo-99 production by 50%. This reduction would be a big step forward by the NNSA in achieving their goal.
In February 2009, Babcock & Wilcox and Covidien jointly announced their intent to work on the development of an Aqueous Homogeneous Reactor (AHR). This proven type of reactor design would run on LEU and would therefore not require separate targets to be irradiated for Mo-99 production as is the case for conventional reactors. Their plans are to build several small units capable of supplying 50% of the U.S. need for Mo-99. Babcock & Wilcox is estimating that the facility can be operational within five years. SNM is not recommending government funding for this effort since it involves two corporations, and the funding for the development of this reactor and associated radiochemistry facility is already in place. What SNM is advocating, however, is government assistance in expediting the regulatory approval process, including the licensing process by the NRC and the FDA.
Forcing a change from HEU to LEU must be done with adequate time made available for the research and development needed for the transition period. There also must be consideration of economic and environmental factors to prevent putting patients at risk because of delays in production of much needed radionuclides, such as Tc-99m which is made from Mo-99. Currently, no large-scale, commercial processes using LEU targets for medical isotopes have been developed, demonstrated, and implemented. In order to establish this process, there are two critical elements that must be accomplished. First, the technology must be proven to be robust and reliable, which requires a significant transition period to demonstrate its efficacy. Second, the system must be able to provide commercial quantities of Mo-99 (thousands of curies per week, every week). Otherwise patients—the ultimate consumers of Tc-99m—will be put at risk.
The financial impact of forcing a change from HEU to LEU remains vague. Although it is technically feasible to produce Mo-99 from LEU, it would not be commercially viable without substantial federal subsidies. In addition to structural and technological changes that must be made, the new technology would require NRC approval and the actual production process would have to be approved by the FDA. Any new technology will not be considered complete until it receives approval from both the FDA and the NRC, which is expensive both in terms of time and the expected fees associated with the application process.



