“…To establish the HIPed first wall component, optimization of the processing technique of the HIP method is mandatory and characterization of the HIPed interface is, therefore, important. Specifically, inspection technologies of destructive and non-destructive methods using the small specimen test techniques (SSTTs) are necessary for investigation of quality of joints between the cooling channels, because the HIP joint is located between thin rectangular tubes and plates [3,4] and it is difficult to use destructive investigation techniques such as Charpy impact tests, which require a relatively large specimen, for the inspection of the real components.…”