Development of Divertor remote maintenance system

摘要

The ITER divertor is categorized as a scheduled maintenance component because of extreme heatand particle loads it is exposed to by plasma. It is also highly activated by 14 MeV neutrons. Reliableremote handling equipment and tools are required for divertor maintenance under intense gammaradiation. To facilitate remote maintenance, the divertor is segmented into 60 cassettes, and eachcassette weighing about 25 tons and maintained and replaced through four maintenance ports each90 degrees. divertor cassettes must be transported toroidaIly and radially for replacement throughmaintenance ports. Remote handling involving cassette movers and carriers for toroidal and radialtransport has been developed. Under the ITER R&D program, technology critical to divertor cassettemaintenance is being developed jointly by Japan, E. U., and U.S. home teams. This paper summarizesdivertor remote maintenance design and the status of technology development by the Japan HomeTeam.