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Report No.
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Study on environmental effect of the advanced fuel recycle system

Shiotsuki, Masao; Yamana, Hajimu; Nakajima, Ichiro

From the viewpoint of environmental effect that is one of the objectives of the actinide recycle, effect of reduction of the potential toxicity by recovery of minor actinides is considered from relation with geological disposal system. And, the influence of a recycling nuclides and recovery fraction into potential toxicity reduction effect and comparison with shallow disposal criteria are evaluated assumed an equivalent FBR cycle with each recycling methods. It is an each independent concepts from the effect of potential toxicity reduction of waste and the disposal technology, and a combination of these two concepts will contribute to reduce an environmental impact. Then potential toxicity reduction effect may be thought about it is adjusted with a recent geological disposal studies that respect for the mechanical barrier potential. The nuclides that should be recovered for reduction of the potential toxicity are evaluated by comparison with the potential toxicity in the uranium ore used in the atomic energy in Japan with the present fuel recycle by 2100. From the result of the waste from an equilibrated FBR cycle, to reduce the potential toxicity effectively, the recovery fraction of MA need about 99.9% and those of Pu and U must be improved more than 99.9%. Comparison evaluation with shallow disposal criteria, the geological disposal system is indispensable in any kind of recycling methods in the light of not only alpha activity but also those of fission products and activation products. And it is evaluated that Cm-Delay and neutron spectrum of FBR core do not influence greatly on these environmental effect.

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