Some Researches on UT and Laser Thermography for NDT Tokamak Plasma-Facing Components
概要
During manufacturing and operation, delamination and surface cracks may be initiated in the plasma-facing components (PFCs) of Tokamak devices. To ensure the quality of the PFCs and safety of Tokamak, NDT techniques of different method are needed. This paper introduces recent researches of authors on UT and laser thermography techniques for inspection of PFCs during manufacturing and in-service. For W/Cu mono-block of divertors, the bonding quality was qualified by using the rotating UT with a focus probe. An EMAT system was established for the in-vessel inspection of delamination defect in first wall of blankets. A laser infrared thermography testing method is highlighted then for the on-line inspection of delamination defect in FW through the vacuum vessel window of the Tokamak device. Finally, a new laser thermography method using laser spot array was introduced for the online inspection of the surface cracks in FW.
