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Report No.

Development of evaluation method of degradation for graphite component in HTGR using non-destructive method

Tada, Tatsuya; Shibata, Taiju ; Sumita, Junya ; Sawa, Kazuhiro

To develop non-destructive evaluation methods for oxidation damage on graphite components in High Temperature Gas-cooled Reactors (HTGRs), the applicability of ultrasonic wave and micro-indentation methods were investigated. As the results of investigation, the relationship between ultrasonic wave velocities and burn-off, oxidation weight loss of graphite, can be expressed empirically by exponential formulas and a wave propagation analysis with a wave-pore interaction model showed slightly less velocity reduction than experimental data of the oxidized graphite. Moreover, micro-indentation characteristics on the graphite samples were changed to show oxidation-induced degradation.



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