Abstract
An investigation was made on the development of ultrasonic nondestructive testing for large graphite blocks, which are to be used in the reactor core of HTGR (High-Temperature GasCooled Reactor). Observations of echos from flaws or structural boundaries in several graphite materials have been made by using pulsed ultrasonics with frequency range of 250kHz-2MHz. The results of the observation show that the ultrasonic technique is quite applicable to nondestructive evaluation for graphite materials, particularly for those graphites with low attenuation coefficient of ultrasound. Also, the studies were made of the relation between attenuation coefficient of ultrasonics and the microstructure of graphite materials. It has been concluded that a graphite material which has high resistance to radiation damage by fast neutron irradiation has low attenuation coefficient of ultrasound, hence, the ultrasonic nondestructive testing method would be easily applied to it.
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