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次世代ナトリウム冷却高速炉の燃料集合体・炉心構成要素設計,1; 燃料集合体上部構造に係る評価検討

Fuel and NFBC assemblies design for the next generation sodium-cooled fast reactor, 1; The Conceptual design for the upper structure of fuel assembly

小澤 隆之   ; 前田 誠一郎 ; 早川 教*; 森 行秀*

Ozawa, Takayuki; Maeda, Seiichiro; Hayakawa, Satoshi*; Mori, Yukihide*

次世代ナトリウム冷却高速炉における燃料集合体のラッパ管とハンドリングヘッドの異材接合方法や上部遮蔽体形状に係る構造検討に加え、上部遮蔽体周りのCFD解析結果に基づき、ラッパ管材の使用温度制限目安を超えない範囲において機能要求を満足する燃料集合体上部構造に係る概念的な評価検討を行った。

The upper structure of fuel assembly for the next generation sodium-cooled fast reactor, including the method of dissimilar connection between wrapper tube and handling head and the structure of the upper shield, was conceptually designed to fulfill functional requirements within a tentative limit of temperature to use wrapper tube material, based on the result of computational fluid dynamics (CFD) analysis.

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