DESIGN STUDIES AND TECHNOLOGY DEVELOPMENT OF TOKAMAK MAIN COMPONENTS FOR FUSION EXPERIMENTAL REACTORS

摘要

Progress in the development of the common technology for fusion experimental reactors at the Japan Atomic Energy Research Institute is described, with a focus on the maintainability of in-vessel components. In the design of the first wall, which is based on a fail-safe concept, a model of a separate first wall was developed and the thermal properties were tested. For the blanket development, hot isostatic pressing bonding technology was successfully applied to the fabrication of a 1/2 scale mock-up of the blanket box structure. A full scale mock-up of the divertor supporting system was also fabricated and the reliability of the locking and lifting mechanism was successfully demonstrated. For the connection and disconnection of the cooling pipes, the feasibility of internal access welding and cutting by a CO_2 laser beam was successfully demonstrated by the fabrication and testing of a 10 kW prototype processing head.