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Report No.

Development of oxidation damage evaluation method for HTGR graphite component by ultrasonic-wave propagation characteristics, 1 (Contract research)

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

Graphite materials used for in-core components of High Temperature Gas-cooled Reactor are gradually oxidized by quite small amount of impurities in primary coolant during long term operation. The oxidation damage is addressed one of crucial factors to determine their lifetime, and it is important to evaluate the damage for components lifetime extension. Since ultrasonic-waves are propagated through interactions with pores in porous ceramics including graphite, it is possible to evaluate the porous condition by propagation characteristics such as velocity and attenuation. We are now developing the oxidation damage evaluation method non-destructively by the wave propagation characteristics. This report shows evaluation formulas to evaluate uniform oxidation condition of graphite. They are obtained experimental data of wave propagation characteristics for parametrically oxidized IG-110 and IG-430 graphite specimens.



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