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Report No.
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Investigation on spent fuel characteristics of High Conversion type core of FLWR (HC-FLWR)

Fukaya, Yuji; Nakano, Yoshihiro; Okubo, Tsutomu

The purpose of this research is to investigate spent fuel characteristics of High Conversion type core of FLWR (HC-FLWR). HC-FLWR is a new reactor concept and the spent fuel characteristics have been investigated comparing with other types of reactor. For the evaluation, the ORIGEN code was also used. The ORIGEN libraries for HC-FLWR were generated using the SWAT code. The decay heat and the radioactivity after a cooling time of 2 years and 4 years were evaluated. As a result, the decay heat and the radioactivity of FP nuclides from the HC-FLWR spent fuel are almost the same as those of LWRs and full-MOX-LWRs with the discharge burn-up of 45GWd/t, and the decay heat and the radioactivity of actinides are higher than others, because of its large amount of loaded Pu inventory and the Pu composition from the LWR spent fuel including large amount of $$^{242}$$Pu. However, the Pu vector of the spent fuel is better than that of full-MOX-LWRs, because of the harder spectrum.

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