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LLFP核変換率に対する補正因子の評価

Evaluation of Correction Factors for LLFP Transmutation Rate

神 智之*; 大木 繁夫

Jin, Tomoyuki*; Oki, Shigeo

FBR実用化戦略調査研究におけるLLFP(Long-Lived Fission Product)核変換炉心設計への適用を目的として、LLFP核変換率に対する補正因子を設計計算と詳細モンテカルロ計算との比較により評価した。設計計算から詳細計算に至る段階的な分析により、(a) 群縮約効果、(b) 輸送効果、(c) 決定論計算とモンテカルロ計算の差、(d) 詳細エネルギー群効果(熱エネルギー領域の効果を含む)、(e) 炉心体系3次元効果、(f) LLFPターゲット集合体の非均質効果、への要因分析を行った。その結果、LLFPターゲット集合体の非均質効果が設計計算と詳細計算の差の主要因であり、その非均質効果のメカニズムは、共鳴から熱エネルギー領域にかけてのLLFP核種の断面積エネルギー形状との関係で説明できることを明らかにした。

For the design study of LLFP (Long-Lived Fission Product) transmutation core concepts in Feasibility Study on commercialized fast reactor cycle systems, correction factors for LLFP transmutation rate were evaluated by comparing the design calculation with the detailed Monte-Carlo calculation. By a step-by-step approach from design to detailed calculation, the correction factors were decomposed into the following factorial effects: (a) group collapsing effect, (b) transport effect, (c) difference between the deterministic method and the Monte-Carlo calculation, (d) detailed energy group effect (including a treatment of the thermal energy region), (e) three-dimensional effect of the core geometry, and (f) heterogeneity effect of the LLFP target assembly. As a result, the heterogeneity effect of the LLFP target assembly was turned out to be the main cause of the difference between the design and the detailed calculations. It is possible to explain the mechanism of the heterogeneity effect in connection with the cross-section shape of LLFP from resonance to thermal energy region.

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