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JUPITER実験解析における中性子ストリ-ミング効果

Nuetron streaming effect in analysis of JUPITER experiment (II)

竹田 敏一*; 谷本 浩一*; 和地 永嗣*; 山本 敏久*; 白方 敬章*; 金城 勝哉*

Takeda, Toshikazu*; not registered; not registered; not registered; not registered; not registered

大型臨界集合体での日米共同実験計画JUPITER Phase 1で行なわれた実験の一部を対象として中性子ストリーミング効果を取り入れた計算方式を用いて実験データの解析を行なった。アルベド衝突確率を用い格子計算に中性子もれを取り入れ、中性子もれの効果が反応率分布にどの程度影響するかを調べた。ZPPR-9炉心のXおよびY方向の各種反応率分布について検討した。制御棒ドロワーのような特異ドロワーの格子定数を、スーパーセルにおける反応率を保存するように決める方法を用い、ZPPR-10Aのピンロッドの制御棒価値を計算し、ドロワー内の非均質性に基づくスミアリング効果並びに輸送効果を求めた。ドロワー内の非均質性を直接炉心計算に取り入れた基準計算結果と比較し、実効格子断面積の有効性について検討した。また、ZPPR-10Cの希釈物質の反応度価値を輸送および拡散計算で求め測定値と比較した。拡散計算でBenoistの拡散係数および統一拡散係数を用いた場合の結果を比較検討した。

Detailed analysis of a part of JUPITER Phase I experiments has been performed by taking into account the neutron streaming effect. The effect of neutron leakage in cell calculations was estimated in terms of the albedo collision probability method, and the several reaction rate distributions in x and y directions in ZPPR-9 assembly were analysed. Using the effective group constants preserving reaction rates in a super-cell, we calculated the control-rod worth of pin rods used in ZPPR-10A, and estimated the smearing and transport effects. Direct core calculations were performed by taking into account the heterogeneity in the pin rod drawers and the results were compared with those obtained by using the effective group constants. Further reactivity worths of diluent materials measured in ZPPR-10C were analysed by using transport and diffusion calculations. In the diffusion calculation, the Benoist and the unified diffusion coefficients were used.

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