2002 年 1 巻 4 号 p. 439-448
Non-destructive test of target plate model for fusion experimental reactor with defects between armor tile (25mm×25mm×10mmt) and cooling substrate (120mmL×25mm×25mm) were performed by Neutron Radio Graphy (NRG), X-ray Radio Graphy (XRG), infrared ray thermography and ultrasonic techniques. Following conclusions were derived;
(1) From the result of heat transfer analysis, it is determined that breakaway defects over 2mm between armor tile and cooling substrate gives particularly serious effect on cooling function of the target plate.
(2) Therefore, it is required to the non-destructive testing techniques with detection sensitivity in breakaway defect length between armor tile and cooling substrate less than 2mm.
(3) Ultrasonic detection technique is not applicable to break away defect due to disturbance and damping of ultrasonic wave in armor tile and infrared ray thermography also gives no information of the defects. However, from the heat transfer analysis, it is suggested that thermography has a potential to detect over 3mm size defect by detecting temperature change difference due to defects.
(4) Neutron radio graphy and X-ray radio graphy techniques exhibit very high sensitivity against less than 0.5mm defect and it is concluded that NRG method is most suitable non-destructive testing technique with high accuracy and reliability for the detection of whole body check of the target plate structure.