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Report No.
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A Feasibility study on MA loading in fast reactor cores

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As one of the efforts to investigate the possibility of realizing an advanced fuel recycling system to recycle MA, a feasibility study is carried on upon a modified PUREX process which is based on the MOX fuel cycle. Although numerous studies have been made so far on the MA burning options in fast reactors, little effort has been devoted to apply the actual loading method of MA or to the proposal of taking measures against the presumable problems when such method is taken. In this study, which is based on design, an attempt to select a recycling process that satisfies all the design requirements and optimization through the evaluations on the merits and demerits in the overall recycle process is done. The selected option enables high performance in MA burning with low impact on the reactor operation or recycle facilities, in which Am is loaded with a non-U diluent in a target pin and placed in the fuel assembly with driver fuel pins. The feasibility study on the selected loading method considers the thermal criteria of the target pin, decay heat from spent fuel, and the impact on core performance. The selected option satisfies all the specified design criteria and at the same time high performance in MA burning.

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