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改良ステンレス鋼燃料被覆管のBWR装荷に向けた研究開発,3-5; 溶接法・検査方法の検討

R&D of advanced stainless steels for BWR fuel claddings, 3-5; Welding and inspection

木村 晃彦*; 薮内 聖皓*; 坂本 寛*; 山下 真一郎   ; 草ヶ谷 和幸*

Kimura, Akihiko*; Yabuuchi, Kiyohiro*; Sakamoto, Kan*; Yamashita, Shinichiro; Kusagaya, Kazuyuki*

軽水炉事故耐性型燃料被覆管の開発においては、接合技術が枢要な技術開発項目とされている。本研究では、ODS鋼被覆管の端栓溶接法として従来の被覆管に採用されているEB溶接法を用いて端栓溶接被覆管の端栓接合強度を評価し、さらに端栓部に対しX線CT検査を実施して接合強度と接合組織の相関を調べ、被覆管端栓接合条件について検討した。

The joining technique of FeCrAl-ODS stainless steel is considered to be the indispensable technology in the development of the accident tolerant fuel cladding for LWRs. In this study, the strength of end cap joining part welded by the conventional EB weld was measured and X-ray CT checks were performed to the end cap joining part to obtain the relationship between the strength and the microstructure. The end cap welding condition was considered from the obtained results.

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