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熱流動解析コードPHOENICSを組み込んだ燃料溶液体系の動特性解析コードの開発及びTRACYの自然冷却特性実験の解析(受託研究)

Development of a kinetics analysis code for fuel solution combined with thermal-hydraulics analysis code PHOENICS and analysis of natural-cooling characteristic test of TRACY (Contract research)

渡辺 庄一; 山根 祐一 ; 三好 慶典

Watanabe, Shoichi; Yamane, Yuichi; Miyoshi, Yoshinori

燃料溶液体系の臨界事故では、正確な情報が必ずしも得られないことから、その熱流動の振舞いを把握するためにはパラメータサーベイ計算が必要である。しかし、一方では従来の熱流動解析計算は時間を要するため、許容できる計算精度の範囲内で計算時間を短縮できる実用的な計算手法が必要である。このため、汎用熱流体解析コードPHOENICSをサブルーチンとして取込み、熱流動を考慮した多領域動特性方程式に基づく中性子エネルギー1群の3次元動特性解析コードを作成した。核熱計算と流動計算の時間刻み幅を分離し、さらに出力の時間変化に応じて時間刻み幅を自動調整することによってコードの計算時間短縮化を図った。TRACYを用いた0.5ドルの反応度投入後の過渡出力に引き続く、緩やかな出力変化が5時間持続する自然冷却特性実験について解析計算を行った。実用的な時間の範囲内で計算が可能であり、出力及び温度変化についての解析値は実験値をほぼ再現する見通しを得た。

Since exact information is not always acquired in the criticality accident of fuel-solution, parametric survey calculations are required for grasping behaviors of the thermal-hydraulics. On the other hand, the practical methods of the calculation which can reduce the computation time with allowable accuracy will be also required, since the conventional method takes a long calculation time. In order to fulfill the requirement, a three-dimensional nuclear-kinetics analysis code considering thermal-hydraulic based on the multi-region kinetic equations with one-group neutron energy was created by incorporating the thermal-hydraulics analysis code PHOENICS as a subroutine. The computation time of the code was shortened by separating time mesh intervals of the nuclear- and heat-calculations from that of the hydraulics calculation, and by regulating automatically the time mesh intervals in proportion to power change rate. A series of analysis were performed for the natural-cooling characteristic test using TRACY in which the power changed slowly for 5 hours after the transient power resulting from the reactivity insertion of a 0.5 dollar. It was found that the code system was able to calculate within the limit of practical time, and acquired the prospect of reproducing the experimental values considerably for the power and temperature change.

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