Abstract
High temperature gas cooled reactors (HTGRs) are designed to produce high temperature gas, and their research and development is carried out in the world wide. Nuclear graphites to be used for the reactors will be subjected to oxidation damage at high temperature over a long period of operation time. In this study, oxidation experiments were carried out under different shear stresses as well as under no applied stress. Moreover, tensile and compression tests were carried out to these oxidized specimens at room temperature. As a result, fine-grained isotropic graphites (IG-11 and IG-110) were weakened by the oxidation. The shear stress at the oxidation treatment gave the much decrease of the tensile strength of IG-110 after oxidation. Test results are discussed with shear stress effects in some detail.
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