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JMTRにおける核加熱率の評価

Evaluation of nuclear heating rate in JMTR

長尾 美春  ; 佐藤 政四; 新見 素二

Nagao, Yoshiharu; Sato, Masashi; Niimi, Motoji

原子炉内の中性子及び$$gamma$$線が混在する照射場におけるモンテカルロ法による$$gamma$$線評価手法に対して、臨界実験装置JMTRCによる$$gamma$$加熱率実験,新たに開発した核加熱率測定用キャプセルによる材料試験炉JMTRにおける核加熱率の測定結果のベンチマークの結果、JMTR炉心の核加熱率解析に適用できることがわかった。本解析手法によりJMTR炉心に対する核加熱率分布を評価するとともに、核加熱率データマップを作成した。このデータマップの値は、核加熱率測定用キャプセルの照射試験結果に対しては-27から+35%の範囲であり、JMTR改修後において、これまで以上に精緻な温度制御を行う照射キャプセルの熱設計に十分利用できる。

An evaluation procedure using Monte Carlo method has been introduced to evaluate $$gamma$$ dose in neutron-$$gamma$$ mixing field of nuclear reactor. Benchmark calculations of the $$gamma$$ heating rate experiments in JMTRC and the nuclear heating rate measurements by the nuclear heating rate measurement capsule in JMTR were conducted by the procedure. As the results, it was confirmed that the procedure was applicable to evaluate $$gamma$$/nuclear heating rate of JMTR. The nuclear heating distribution of JMTR core was analyzed, and the nuclear heating data maps were prepared. The values of the data maps were comparison with the results of irradiation tests by the nuclear heating rate measurement capsule. As the results, the values of the data map were within -27 to +35 % in comparison with the irradiation tests. The data maps are therefore utilizable for thermal design of irradiation capsule with more accurate temperature control, after refurbishment of the JMTR.

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