Development of radiation hardness components for ITER remote maintenance

摘要

In the ITER, in-vessel remote handling is required to assemble and maintain in-vessel components inDT operations. Since in-vessel remote handling systems must operate under intense gamma rayradiation exceeding 30 kGy/h, their components must have sufficiently high radiation hardness toallow maintenance long enough in ITER in-vessel environments. Thus, extensive radiation tests andquality improvement, including optimization of material compositions, have been conducted throughthe ITER R&D program to develop radiation hardness components that meet radiation doses from 10to 100 MGy at 10 kGylh.This paper presents the latest on radiation hardness component development conducted by the JapanHome Team as a contribution to the ITER. The remote handling components tested are categorizedfor use in robotic or viewing systems, or as common components. Radiation tests have beenconducted on commercially available products for screening, on modified products, and on newproducts to improve the radiation hardness.