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Finite element analysis with an axisymmetric model of the tritium diffusion in a ceramic blanket solution of a commercial tokamak

S. Abou Said, M. Caira, C. Caroli, V. Violante1991年Fusion Engineering and DesignIF 1.7出版社

AbstractTritium diffusion and transport behaviour through porous γ-LiAlO2 solid breeder rods of a blanket for a Commercial Tokamak, has been studied for a typical reactor start-up from a “clean” breeder. The proposed tritium transport model accounts for grain diffusion, (using a simplified model), desorption from the surface and pore diffusion, and has been used for the evaluation of the overall characteristic time of the transient tritium release into the helium purge gas. Because of the strong dependence of diffusion and desorption coefficients on temperature, also a detailed thermal analysis has been performed. This study considers a bidimensional axisymmetrical geometry for the blanket and the calculations have been carried out using the general-purpose Finite Element program TRIO E.F.

日本語訳

商業トカマク用ブランケットの固体増殖材ロッドである多孔質γ-LiAlO₂を通じたトリチウム拡散および輸送挙動について、「クリーンな」増殖材からの典型的な原子炉起動時を想定して研究が行われた。提案されたトリチウム輸送モデルは、粒内拡散(簡易モデルを使用)、表面からの脱離、および細孔内拡散を考慮し、ヘリウムパージガス中への過渡的なトリチウム放出の全体特性時間の評価に用いられた。拡散係数および脱離係数の温度依存性が強いことから、詳細な熱解析も実施された。本研究では、ブランケットの二次元軸対称形状を考慮し、計算は汎用有限要素プログラムTRIO E.F.を用いて行われた。

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