Design improvements and R&D achievements for vacuum vessel and in-vessel components towards ITER construction

ITER建設を目的とした真空容器と容器内コンポーネントの設計改善とR&D成果

伊尾木 公裕*; Barabaschi, P.*; Barabash, V.*; Chiocchio, S.*; Daenner, W.*; Elio, F.*; 榎枝 幹男; Gervash, A.*; Ibbott, C.*; Jones, L.*; Krylov, V.*; 黒田 敏公*; Lorenzetto, P.*; Martin, E.*; Mazul, I.*; Merola, M.*; 中平 昌隆; Rozov, V.*; Strebkov, Y.*; 鈴木 哲; Tanchuk, V.*; Tivey, R.*; Utin, Y.*; 山田 政男*

Ioki, Kimihiro*; Barabaschi, P.*; Barabash, V.*; Chiocchio, S.*; Daenner, W.*; Elio, F.*; Enoeda, Mikio; Gervash, A.*; Ibbott, C.*; Jones, L.*; Krylov, V.*; Kuroda, Toshimasa*; Lorenzetto, P.*; Martin, E.*; Mazul, I.*; Merola, M.*; Nakahira, Masataka; Rozov, V.*; Strebkov, Y.*; Suzuki, Satoshi; Tanchuk, V.*; Tivey, R.*; Utin, Y.*; Yamada, Masao*

ITERの真空容器や容器内コンポーネントの基本設計概念は変わっていないが、信頼性向上,メインテナンス性改善,コスト低減の観点から、設計の詳細において幾つかの点の改良を検討した。真空容器のR&Dにおける最も大きな成果は必要な製作組立精度の実証である。さらに最近ポートの切断による変形量を測定し、その値が十分小さいことを確認した。また、厚板の溶接,切断、及び超音波非破壊検査に関する先進技術の開発をさらに進めた。第一壁/ブランケットとダイバータのR&Dについては、第一壁パネル,ブランケット遮蔽ブロック,ダイバータのフルスケールのモックアップの製作に成功し、設計条件を満たす技術を開発することができた。

Although the basic concept of the vacuum vessel (VV) and in-vessel components of the ITER design has stayed the same, there have been several detailed design improvements resulting from efforts to raise reliability, to improve maintainability and to save money. One of the most important achievements in the VV R&D has been demonstration of the necessary fabrication and assembly tolerances. Recently the deformation due to cutting of the port extension was measured and it was shown that the deformation is small and acceptable. Further development of advanced methods of cutting, welding and NDT on a thick plate have been continued in order to refine manufacturing and improve cost and technical performance. With regard to the related FW/blanket and divertor designs, the R&D has resulted in the development of suitable technologies. Prototypes of the FW panel, the blanket shield block and the divertor components have been successfully fabricated.