Measurement on irradiation-induced property change of carbon composite material for Very High Temperature Reactor; Irradiation-induced dimensional change, coefficient of thermal expansion and elastic modulus

Takagi, Takashi*; Makita, Taiyo*; Kunimoto, Eiji; Shibata, Taiju ; Sawa, Kazuhiro

To advance the performance and safety of High Temperature Gas-cooled Reactors (HTGRs), it is expected to use heat-resistant materials substitute for metallic materials in the core internal structural components of HTGRs at higher temperature. Carbon fiber reinforced carbon-carbon composite (C/C composite) is one of candidates as heat-resistant materials, and investigations are under going to apply the core internal structural components such as the control rod for the Very High Temperature Reactor (VHTR). This report describes the experimental results of irradiation effects on dimensional change, coefficient of thermal expansion and elastic modulus obtained by PIE (Post-Irradiation Examinations) for C/C composite irradiated in 03M-47AS capsule at the Japan Materials Testing Reactor (JMTR).