Abstract
Japanese nuclear power plants are under the control of the Ministry of International Trade and Industry (MITI), which has an established policy of not allowing presence of any defect in nuclear power plant components. This policy does not require detailed information about the dimensions and geometry of defects nor assessment of the fracture mechanics, but it only requires immediate repair of the defect. For the examination of welds, radiographic examination is mainly used during construction of a power plant and ultrasonic examination is used for ISI. In order to obtain the three-dimensional image of the defect, JAPEIC has been developing an advanced nondestructive examination apparatus. To detect defects in geometrically complex components, JAPEIC is also examining the development of an imaging method. In Japan, to ensure the structural integrity, it is considered most important to develop a technique to detect and measure material degradation nondestructively and evaluate the result by fracture mechanics.
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