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THE EFFECTS OF REACTOR TYPE AND FUEL What about differences between reactor types and fuels? 8. As can be seen, the largest concentrations of protactinium and neptunium are expected for a THTR operated in breeding mode on the Th/U cycle, the largest plutonium concentration for a LMFBR operated in breeding mode on the U/Pu cycle, and the largest curium concentration for a PWR operated on enriched uranium fuel. FUEL CYCLES Figure 1 illustrates the current and future options for the U/Pu fuel handling.

This would result in more spent fuel for a given energy production, albeit with a smaller concentration of Pu, which might remove the gain. Careful calculations are needed in order to find an eventual optimum. 33 TABLE I. 8 (based on data from [1], [2] and [3]). 24 The LMFBR (U/Pu cycle) and THTR (Th/U cycle) are assumed to operate in breeding mode. THE EFFECTS OF REACTOR TYPE AND FUEL What about differences between reactor types and fuels? 8. As can be seen, the largest concentrations of protactinium and neptunium are expected for a THTR operated in breeding mode on the Th/U cycle, the largest plutonium concentration for a LMFBR operated in breeding mode on the U/Pu cycle, and the largest curium concentration for a PWR operated on enriched uranium fuel.

5 - Reduction of stock-piles of weapons-grade material. High enriched uranium fiiel could be used, which would lead to minimal production of transuranics. However, this may pose another safeguard problem. g. ATR or FBR. Accelerator-driven systems may also have some benefits as Pu burners. 6 - Most important To develop reprocessing and separation technology towards smaller losses to wastes. 37 To be wary of new processes not proven on an industrial scale (remember the MidWest Fuel Recovery Plant).

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