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KUCAにおける鉛/ビスマス混合比の異なる系統的なサンプル反応度価値測定

Sample worth measurement with systematically changed mixing ratio of Lead and Bismuth in KUCA

大泉 昭人   ; 山中 正朗*; 福島 昌宏   ; Pyeon, C. H.*

Oizumi, Akito; Yamanaka, Masao*; Fukushima, Masahiro; Pyeon, C. H.*

加速器駆動未臨界システム(ADS)の冷却材候補である鉛(Pb)とビスマス(Bi)の断面積の積分評価のために、京都大学臨界集合体実験装置(KUCA)において比較的硬い中性子スペクトル場でのPb及びBiのサンプル反応度価値がそれぞれ独立に測定されている。モンテカルロ計算コードMCNPとJENDL-4.0を用いた実験解析値を、測定値と比較するとPb及びBi間で優位な差異がある。本実験では、Pb及びBi単体のサンプル反応度価値測定値を補完するため、過去の実験と同一条件の下で、Pb対Bi混合比の異なる反応度価値測定を系統的に実施した。まず、Pb単体(100%)の測定結果から、過去の実験の再現性を確認した。また、本実験で新たに得られた鉛体積充填率が異なる測定値は、いずれも過去のPb単体(100%)及びBi単体(0%)の測定値間を補完することを確認した。今後、これら一連の実験解析をJENDL, ENDF, JEFFで行い、C/E値を評価する。また、感度解析により、実験値との差、核データ間の差について、原因である核種・反応の特定を行う。

Sample reactivity worths of Lead (Pb) and Bismuth (Bi), which are a coolant candidate for the accelerator driven system (ADS), have been independently measured for the integral evaluations of their cross sections in the relatively hard neutron spectrum in the Kyoto University Critical Assembly (KUCA), respectively. There is a difference between C/E values of Pb and Bi which are obtained by comparing experimental analysis values using the Monte Carlo calculation code MCNP with the JENDL-4.0 nuclear data library with the measured values. In this experiment, in order to complement the measured values of simple substances of Pb and/or Bi, the sample reactivity worth measurements with systematically changed mixing ratio of them were carried out under the same conditions as the past experiments in the KUCA. First, the reproducibility of past experiments was confirmed from the measurement result of Pb simple substance (Pb100%). In addition, it was confirmed that the new measured values different in the lead volumetric filling ratio obtained in this experiment supplement between the measured values of simple substances of Pb (Pb100%) and Bi (Pb0%) in the past. In the future, the analyses of these series of experiments and the evaluations of C/E values will be carried out by using nuclear data libraries of JENDL, ENDF, and JEFF. By using the sensitivity analysis, we will identify the nuclides and their reactions responsible for the differences between the experimental and measured values and among the each nuclear data library.

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