Basis data for surveillance test on core support graphite structures for the High Temperature Engineering Test Reactor (HTTR)

Sumita, Junya ; Shibata, Taiju ; Kikuchi, Takayuki; Ishihara, Masahiro ; Iyoku, Tatsuo; Sawa, Kazuhiro; Fujimoto, Nozomu

Visual inspection by a TV camera and material properties measurement by surveillance test on core support graphite structures are planned for the High Temperature Engineering Test Reactor (HTTR) to confirm their structural integrity and characteristics. The surveillance test is aimed to investigate the change of material and mechanical properties by aging effects such as fast neutron irradiation and oxidation. The obtained data will be used not only for evaluating the structural integrity of the core support graphite structure of the HTTR but also for design data to advanced Very High Temperature Reactor (VHTR) discussed at generation IV international forum. This report describes the material properties and installed position of surveillance specimens in the HTTR in order to carry out the surveillance test.