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Validation of fablicability for ITER TF coil structures

ITER TFコイル構造物の製作性検証

千田 豊; 井口 将秀; 中嶋 秀夫; 大勢持 光一*; 新見 健一郎*; 渡海 大輔*

Chida, Yutaka; Iguchi, Masahide; Nakajima, Hideo; Osemochi, Koichi*; Niimi, Kenichiro*; Tokai, Daisuke*

ITER TFコイル構造物はコイルに発生する電磁力を極低温(約4K)で支持するために、極厚の高強度・高靱性ステンレス鋼容器と支持構造物で構成されている。原子力機構は2008年度より極厚のステンレス鋼に対する基礎的な溶接試験を開始し、TFコイル構造物の製造に関する技術課題を検証するために、主要部材の実機大部分模型体の試作を行った。また、これらの検証試験と並行して日本機械学会において核融合設備規格超伝導マグネット規格(JSME規格)の制定に寄与した。本論文ではJSME規格の概要を紹介すると同時に、これまで実施した試験及び試作によって得られたTFコイル構造物の製作性検証結果を紹介する。

The Japan Atomic Energy Agency (JAEA), acting as the Japan Domestic Energy Agency (JADA) in the ITER project, is responsible for the procurement of structures for 19 TF coils (including one spare). TF coil structures, which support large electromagnetic force generated in TF coils under the cryogenic temperature (about 4K), are the mega welding structures composed of coil case and support structures made of high strength and high toughness stainless steel. JAEA started the study on welding trials for heavy thickness materials since 2008 and is demonstrating of full scale mock-up model fabrication for main sub-components in 2010 in order to investigate the technical issues for manufacturing of TF coil structures. This paper introduces the results on welding trials and status of full scale mock-up model fabrication to confirm the validity of welding technology and manufacturing design before fabricating actual products. Enough weld joint performance was obtained with the base metal of JJ1 (high strength and high toughness stainless steel developed in Japan) and SS316LN, and also their combination using JJ1 filler wire (developed in Japan) by narrow gap GTAW process. Welding deformation such as angular distortion between outer plate and side plate of U-shape segment could be controlled and minimized by using effective restraint jig and no defects was observed in the welds by radiographic testing (RT) in trial manufacturing of 1m length. Validity of welding technology and manufacturing design such as fabrication sequence, welding procedure specification (WPS), quality control plan is confirmed during full scale mock-up model fabrication.

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