Development of bore tools for blanket cooling pipe connection in ITER

According to the ITER R&D program, the bore tools for welding, cutting and weld inspection of blanket cooling pipes by the in-pipe access have been developed. In order to meet the ITER requirements, the YAG laser transmitted through a flexible optical fiber and the electro-magnetic acoustic transducer (EMAT) were adopted for welding/cutting and weld inspection, respectively. Their performance have been verified, including the movement and positioning in the cooling pipes. In addition, the radiation hard ultrasonic transducer (UT) and the leak detectors have been also tested. This paper describes the design outline and test results of bore tools developed for welding, cutting and weld inspection of the ITER blanket cooling pipes.