| 摘要 |
PROBLEM TO BE SOLVED: To provide a spacer for a fuel assembly provided with a ferrule tube having impact fracture proof performance against an impact from a fuel rod. SOLUTION: In this spacer for the nuclear reactor fuel assembly assembled integrally by collecting a plurality of thin-walled tubes called as the ferrule pipe worked to bend one portion of the thin-walled tube inwards, and by welding an outer circumference of an assembly of the thin-walled tubes while surrounding it with a thin sheet called as a band, a curvature radius R of a bent-worked portion has a value of satisfying Expression 1, where R0 is an inside diameter (mm) before press work of the ferrule tube, R is the minimum inside curvature radius (mm) after work formation of the ferrule tube, and T is a sheet thickness (mm) of the ferrule tube. COPYRIGHT: (C)2005,JPO&NCIPI
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