Ultrasonic testing of plasma-facing ITER components with use of a innovative equipment

Speaker:
Lyanzberg, Dmitry; Efremov Institute of Electrophysical Apparatus; Russian Federation

Authors:
Lyanzberg, D.; Efremov Institute of Electrophysical Apparatus; Russia
Gurieva, T.; Efremov Institute of Electrophysical Apparatus; Russia
Giniyatulin, R.; Efremov Institute of Electrophysical Apparatus; Russia
Bulavinov, A.N.; I-Deal Technologies; Germany

ID: ECNDT-0479-2018
Download: PDF

Efremov Institute of Electrophysical Apparatus is large Russian developer and manufacturer of high-heat-flux plasma-facing components (PFC) of First Wall Panels (FWP) and of Divertor for the ITER project. Non-destructive testing of the ITER PFCs is obligatory procedure because of extreme operating conditions and high requirements to quality of manufacture. The FWP and Divertor components represent geometrically difficult multi-layered constructions made from various materials: stainless steel, tungsten, beryllium, copper, bronze. The components are manufactured by different joining methods, i.e. brazing, casting, explosion welding, hot-isostatic pressing. The welded joints of components represent austenitic seams of difficult configurations with limited zones of access executed by various technologies of argon-arc and laser welding. The paper illustrates the experience of use of innovative technologies and equipment for the solution of problems of ultrasonic testing. The robot-based immersion equipment is used for ultrasonic testing of multi-layered joints (tungsten/copper/bronze, beryllium/bronze, bronze/steel) in the ITER objects having the curvilinear surface for input of ultrasonic waves. In the report the authors consider the features and advantages of use of the robotic equipment in combination with the Phased Array technology. The specialized scanner and the specialized probe with surface adapted under the internal diameter of a tube are used for in-tube ultrasonic testing of the multi-layered joint (bronze/copper/tungsten). The paper includes the examples of acoustic images that characterize the quality of materials and various joints in multilayered ITER PFCs. The welded joints executed by argon-arc and/or laser welding are tested using the modern equipment of manual ultrasonic testing with use of Phased Array technology and visualization of testing results. The analysis of use of the innovative equipment and comparison of testing results from foreign participants of the ITER project allows to draw a conclusion about informativity and relevance of ultrasonic testing technologies at manufacture of the ITER components in Russia.