Influence of the nuclear data library in the core calculation of a high temperature gas-cooled reactor

Yasumoto, Takashi*; Goto, Minoru  ; Shimakawa, Satoshi; Nakagawa, Shigeaki  ; Seki, Yasuyoshi; Matsuura, Hideaki*; Nakao, Yasuyuki*

Core calculation of the HTTR yielded overestimation of the excess reactivities to the experimental data, and this problem has not been resolved yet. It is one of the important issue to select nuclear data library, which was used for the core calculations, to obtain the calculation results with high accuracy. In the past, the effect of difference of nuclear data libraries on the HTTR core calculation results was evaluated using JENDL-3.3, ENDF/B-6.8 and JEFF-3.1. As a result, JENDL-3.3 yielded better excess reactivities than ENDF/B-6.8 and JEFF-3.1. In this study, the effect was reevaluated using the latest version of ENDF/B: ENDF/B-7.0 and the preliminary version of JENDL-4.