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Report No.
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Production of fast reactor group constant set JFS3-J3T and analysis of ZPPR-9

Takano, Hideki*; Kaneko, Kunio*; Ishiguro, Yukio*

The fast reactor 70-group constant set JFS-3-J3T has been generated by using the JENDL-3T nuclear data. One-dimensional benchmark calculations and the analyses of the ZPPR-9 and FCA-VI-2 assemblies were performed with the JFS-3-J3T set. The results obtained are summarized as follows: (1)The k$$_{eff}$$'s are underestimated by 0.6% for Pu-fuel cores and overestimated by 2% for U-fuel cores. (2)The central reaction rate ratio $$sigma$$$$_{f}$$(Pu-239)/$$sigma$$$$_{f}$$(U-235)is in a good agreement with the experimental value and $$sigma$$$$_{c}$$(U-238)/$$sigma$$$$_{f}$$(Pu-239) is overestimated. (3)Doppler and Na-void reactivities are in a good agreement with the measured data. (4)The radial reaction rate distributions are improved in the comparison of the results obtained with the JENDL-2 data. Furthermore, the benchmark test of JENDL-3T/Rev.1 which was revised for several important nuclides on the basis of the results described above has been performed. It was shown that JENDL-3T/Rev.1 predicted nuclear characteristics more satisfactory than JENDL-2, excepting the overestimate for the reaction rate ratios of $$sigma$$$$_{c}$$(U-238)/$$sigma$$$$_{f}$$(Pu-239) and $$sigma$$$$_{f}$$(U-238)/$$sigma$$$$_{f}$$(U-235).

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