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Development of a fine and ultra-fine group cell calculation code SLAROM-UF for fast reactor analyses

詳細及び超微細群計算に基づく高速炉用格子計算コードSLAROM-UFの開発

羽様 平 ; 千葉 豪; 杉野 和輝

Hazama, Taira; Chiba, Go; Sugino, Kazuteru

超微細群計算と詳細群計算に基づく高精度に実効断面積を作成できる高速炉用格子計算コードSLAROM-UFを開発した。超微細群計算では、52.5keV以下について共鳴構造を直接的に扱える詳細な群数で減速方程式を解き、詳細群計算ではその他のエネルギー範囲について最小レサジー幅0.008で格子計算を行う。SLAROM-UFの解析精度を連続エネルギーモンテカルロ法による参照解と比較することにより検証した結果、既存の70群炉定数に対して、「常陽」MK-I燃料に対する格子計算では無限増倍率について0.15%のずれが0.01%以内に改善することを、ZPPR-10Aに対する炉心計算では、臨界性で0.2%改善し、参照解と一致することを確認した。

A cell calculation code SLAROM-UF has been developed for fast reactor analyses to produce effective cross sections with high accuracy in practical computing time, taking full advantage of fine and ultra fine group calculation schemes. The ultra fine group calculation below 52.5keV solves the slowing down equation and can treat resonance structures directly and precisely including resonance interference effects. The fine group calculation covers the other energy range in a group structure with a minimum lethargy width of 0.008. Calculation accuracy and improvements from conventional 70 group cell calculations were investigated through comparisons with reference values obtained with a continuous energy Monte Carlo calculation. It was confirmed that SLAROM-UF reduces the difference in k-infinity from 0.15% to 0.01% on a "JOYO" MK-I fuel subassembly lattice cell calculation, and also reduces the difference in criticality from -0.21% to less than a statistical uncertainty of the reference calculation of 0.03% on a ZPPR-10A core calculation.

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パーセンタイル:96.17

分野:Nuclear Science & Technology

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