R&Ds for application of IG-110 graphite to VHTR in-core components

Shibata, Taiju ; Kunimoto, Eiji; Sumita, Junya ; Yamaji, Masatoshi*; Konishi, Takashi*; Sawa, Kazuhiro

Fine-grained isotropic graphite IG-110 (Toyo Tanso Co.) is used for the core components in the HTTR. It is a proven graphite and a major candidate for in-core components of the VHTR. Japanese graphite code and standard for the HTTR show the criteria of IG-110 for the application to the in-core components. They include IG-110 property data, oxidation effect, irradiation effect and so on. They are established on the basis of IG-110 component test results. It is thought that the code and standard for the IG-110 would be applicable to the VHTR with some adjustments. For this purpose, establishment of the IG-110 design data for the VHTR condition is one of the key subjects. The development of interpolation and extrapolation for the irradiation data would help the design data establishment. The R&D subjects on the IG-110 for the in-core VHTR components will be summarized and presented in this study.