Progress on the Development of the Fabrication Technology for the ITER First Wall in Korea

Korea is responsible for the procurement of the ITER first wall (FW) blanket modules 1, 2 and 6, and has been developing the fabrication technology of them. Joining Be, CuCrZr and stainless steel (SS) is the most important aspect of the FW and to derive the optimum joining conditions, several mock-ups with various temperatures and pressure conditions between CuCrZr, and SS and with various interlayers between Be and CuCrZr were fabricated by using a hot isostatic pressing (HIP) bonding method. After the HIP joining, no cracks and pores were observed at the Be/CuCrZr and CuCrZr/SS joining interfaces and destructive tests showed the joining interfaces have a sufficient mechanical strength. High heat flux (HHF) tests of the mock-ups were performed to verify their integrities using e-beam facilities. All the fabricated mock-ups survived up to the expected fatigue lifetime and the measured temperatures show a good agreement with the analytical results. Fabrication of the Be/CuCrZr/SS qualification mock-ups using the developed joining technology is progressing and a high heat flux test for a mock-up qualification will be performed.