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Report No.
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Safety reactor to reduce high level radioactive waste

Fukaya, Yuji   

The concept of naturally safe reactor to reduce high level radioactive waste is introduced. In the concept, fuel matrix except for $$^{238}$$U, which generates high order MA, is employed. As the candidates, there are Th matrix fuel HTGR and YSZ-Er matrix fuel HTGR. For the Th matrix fuel HTGR, reprocessing is necessary because the toxicty of $$^{233}$$U and $$^{234}$$U is significant. The effect of reduction of toxicity is as same as that of the partitioning and transmutation. For the YSZ-Er matrix fuel HTGR, the effect is deplated, but the reprocessing is not necessary. These HTGRs will be realized because of the simple process with high probability. Moreover, it is expected that secondary waste will be also reduced.

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