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"MAGI"の高度化のための核熱計算作業(II)

Nuclear and thermal analyses for the "MAGI" code system upgrade(2)

川島 正俊*; 森本 保幸*

Kawashima, Masatoshi*; not registered

「常陽」運転監視コード"MAGI"の高度化は、MK-III炉心への炉心変更に併せて、従来の運転監視機能にとどまらず、照射場全体の核熱特性の予測計算精度向上を図ることを目的としている。このような大幅な機能拡大のためには、ローカルな照射場における核熱特性計算手法を増強する適切な手法を新たに採用する必要がある。検討の結果、中性子・ガンマ線束のエネルギー群数は18群、7群とし、炉心全体の出力分布・燃焼度分布は従来の集合体内1メッシュから大幅に詳細化する集合体24メッシュ分割拡散計算により求めることとした。この詳細メッシュモデルの採用と併せて、集合体の組成領域を複数考慮することを集合体タイプ別に設定することを提案した。

The core management code system "MAGI" was developed for the Experimental Fast Reactor, JOYO. The "MAGI" system upgrade aims at improving the prediction accuracy for the neutronic and thermal characteristics along with the plant up-grade. To achieve the goals, new appropriate methodology is needed for local characteristic predictions in the core and surrounging regions. The new basic methodology includes fine mesh-spacing (24 mesh poins per hexagon) and increased energy groups (18 neutron and 7 ga㎜a groups) with diffusion calculation. To utilize the fine mesh-spacing model with improved heterogeneous structures for varaious types of subassembly, simple rules are proposed for modeling, based on the numerical comparisons for reactivity worth, power distributions and burnup composition variations. To realize the "MAGI" system upgrade, it is required to establish further detail rules for various irradiation rigs for data flow specifications. It is also required to make the basic modules of the system, hereafter.

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