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太田 宏一*; 尾形 孝成*; 山野 秀将; 二神 敏; 島田 貞衣*; 山田 由美*
Proceedings of 30th International Conference on Nuclear Engineering (ICONE30) (Internet), 8 Pages, 2023/05
The experimental analyses of the U-Pu-Zr fuel pin behavior during transient overpower (TOP) tests were performed by CANIS, and the residual cladding wall thickness and molten region of the fuel alloy after the tests, and the reactivity inserted by molten fuel extrusion before the fuel pin failure were compared with the experimental results. On the basis of these analysis results, detailed calculation models were developed for and implemented into CANIS to be made it possible to consider changes in the local properties of the fuel alloys due to redistribution of fuel constituents during steady-state irradiation and in the cladding thinning rate depending on the fuel-cladding interface temperature. The modified CANIS properly predicted fuel behavior and resulting reactivity changes before fuel pin failure in TOP events.
小川 徹; 岩井 孝; 倉田 正輝*
J. Less-Common Met., 175, p.59 - 69, 1991/00
U-Zr、U-Pu-Zr合金燃料は照射下での温度勾配によって、内部で組成の再分布を生じ、径方向に3つの領域を形成する。この現象を、相分離を伴う熱拡散過程として捉え、数値解析によって再現するモデルを提出した。これらの合金系に特異な熱力学的性質と輸送特性の組合せが、顕著な物質再分布の原因となっていることを明らかにした。