Joining techniques development for neutron irradiation tests and post irradiation examinations in JMTR-HL

Taguchi, Taketoshi ; Inaba, Yoshitomo  ; Kawamata, Kazuo; Nakagawa, Tetsuya; Tsuchiya, Kunihiko 

The JMTR-HL is directly connected with reactor core by a water canal. Hence irradiated radioactive capsules are efficiently transported under water through the canal in a short time. As the part of PIE technology development, several kinds of welding techniques have been systematically developed. These techniques are as follows; (1) re-instrumentation of FP gas pressure gauge and thermocouple to an irradiated fuel rod, (2) welding procedure development for re-capsuling of irradiated materials, (3) joining technique and PIEs development of different materials with friction welding for new typed irradiation capsules and (4) rewelding with irradiated and un-irradiated materials and fabrication of test specimen with the rewelding for fusion reactor development. These welding techniques have been very indispensable for supporting the irradiation tests and post-irradiation examinations and were introduced in this seminar.