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Applicability of single mode fiber laser for wrapper tube cutting

シングルモードファイバーレーザのラッパ管切断に対する適応性

涌井 遼平; 北垣 徹 ; 樋口 英俊; 竹内 正行 ; 小泉 健治 ; 鷲谷 忠博 

Wakui, Ryohei; Kitagaki, Toru; Higuchi, Hidetoshi; Takeuchi, Masayuki; Koizumi, Kenji; Washiya, Tadahiro

Japan Atomic Energy Agency (JAEA) has been developing a fuel disassembly system with reliability for FBR fuel reprocessing. Laser technology has a high cutting performance and stable operation. However, it was hard to apply to the fuel disassembly system in our previous study, because of pin damage and dross adhesion between a wrapper tube and fuel pins. The advance of the laser cutting technology has recently attracted. Development of single mode fiber laser (SMFL) with small diameter of a beam spot has been especially reported. Then, we believed that it has become possible to prevent the dross adhesion in the disassembly. The main purpose of this study is to reevaluate an applicability of laser for the wrapper tube cutting by the basic cutting tests. Concretely, we researched whether cutting conditions such as SMFL etc, have the effects on dross adhesion and pin damage or not and tried to prevent these original matters. As the result, it was demonstrated that the kerf width of SMFL is still thinner than that of multi mode fiber laser (MMFL). The phenomenon is very important to decrease the amount of dross. Therefore, we confirmed that SMFL is suitable for prevention of the original matters and this experimental results shown the new feasibility method of wrapper tube cutting.

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