Development of Radiation Hardness Components for ITER Remote Maintenance
Kenjiro Obara*, Satoshi Kakudate*, Kiyoshi Oka*, Akira Ito*, Toshiaki Yagi** and Yousuke Morita**
*Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, 2-4 Shirakata-shirane, Tokai-mura, Naka-gun, Ibaraki 311-01, Japan
**Takasaki Radiation Chemistry Research Establishment, JAERI, 1233 Watanuki-machi, Takasaki, Gunma, 370-1292, Japan
In the ITER, in-vessel remote handling is required to assemble and maintain in-vessel components in DT operations. Since in-vessel remote handling systems must operate under intense gamma ray radiation exceeding 30 kGy/h, their components must have sufficiently high radiation hardness to allow maintenance long enough in ITER in-vessel environments. Thus, extensive radiation tests and quality improvement, including optimization of material compositions, have been conducted through the ITER R&D program to develop radiation hardness components that meet radiation doses from 10 to 100 MGy at 10 kGy/h. This paper presents the latest on radiation hardness component development conducted by the Japan Home Team as a contribution to the ITER. The remote handling components tested are categorized for use in robotic or viewing systems, or as common components. Radiation tests have been conducted on commercially available products for screening, on modified products, and on new products to improve the radiation hardness.