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照射キャプセル設計支援のための3次元温度計算用サブプログラムの開発

Development of capsule design support subprograms for 3-dimensional temperature calculation using FEM code NISA

飛田 正浩*; 松井 義典 

Tobita, Masahiro*; Matsui, Yoshinori

炉内照射試験における照射温度の予測は、照射キャプセル設計において重要な項目の一つである。近年の照射試験では、種々の試験条件の要求に対応するため、複雑な構造のキャプセルが多く、照射温度の精度良い評価には、3次元計算を必要とするケースが増えている。しかし、3次元温度計算では一般に入力の作成等に複雑な作業を必要とし、多くのパラメータ計算を行う設計作業では大変な時間と労力を要する。このため、3次元有限要素法コードNISA1)(Numerically Integrated elements for System Analysis)の導入とともに、キャプセル設計者の入力作成作業を支援するサブプログラムを開発した。この結果、3次元温度計算がより容易に実施可能になるとともに、$$gamma$$発熱率の自己遮へいによる構造物内部での減衰等の効果,炉内照射に特有の効果も取り扱えるようになった。

Prediction of irradiation temperature is one of the important issues in the design of the capsule for irradiation test. Many kinds of capsules with complex structure have been designed for recent irradiation requests, and three-dimensional (3D) temperature calculation becomes inevitable for the evaluation of irradiation temperature. For such 3D calculation, however, many works are usually needed for input data preparation, and a lot of time and resources are necessary for parametric studies in the design. To improve such situation, JAERI introduced 3D-FEM (finite element method) code NISA (Numerically Integrated elements for System Analysis) and developed several subprograms, which enabled to support input preparation works in the capsule design. The 3D temperature calculation of the capsule are able to carried out in much easier way by the help of the subprograms, and specific features in the irradiation tests such as non-uniform gamma heating in the capsule, becomes to be considered.

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