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Development of versatile nuclear heating calculation system in MARBLE

MARBLEにおける多様な発熱計算システムの開発

羽様 平; 横山 賢治

Hazama, Taira; Yokoyama, Kenji

汎用炉心解析システムMARBLE上に発熱評価システムを開発した。開発したシステムは従来使用されてきた入射エネルギーに依存しないQ値に基づく簡易手法から核データ処理コードNJOYに基づく詳細手法に至る多様な選択肢を有している。入射エネルギーに依存しないQ値を用いた場合でも詳細手法相当の結果を評価する機能も有しており、簡易手法の誤差評価や中性子や$$gamma$$線の輸送効果の評価に利用できる。「もんじゅ」の設計計算モデルで最も詳細な手法に対する誤差を評価した結果、詳細相当手法の誤差は0.1%未満であること、簡易評価手法の誤差は1%未満であることを確認した。

A versatile nuclear heating calculation system is developed in MARBLE, a neutronics calculation platform based on the object-oriented language. The system provides a variety of heating calculation methods from the conventional simple methods based on energy-independent Q-values, to a detailed method based on NJOY. A particular feature is in hybrid methods that consider energy dependence employed in NJOY in the system. The hybrid methods provide tools to assess errors in the simple methods and to evaluate the heat transport property by neutrons and photons precisely. The accuracy of the hybrid methods and the errors in the simple methods are investigated in a Monju design calculation. It is confirmed that the hybrid methods realize the nuclear heating by the detailed method within an accuracy of 0.1%. The neglect of incident energy dependence of the fission Q-value in the simple methods causes clear overestimation in the Q-value but its influence on the total heating is less than 1%.

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