Speaker
Prof.
Jiming Chen
(Southwestern Institute of Physics)
Description
To withstand a surface heat load up to 4.7MW/m2 in a life time of 16000 cycles, the enhanced heat flux (EHF) ITER FW panel uses a hypervapotron (HVT) CuCrZr/316L(N) cooling channel and small Beryllium tiles. R&Ds have been carried out in China on manufacturing and testing of EHF FW mock-ups towards the final provision of series FW products for ITER. A hot iso-static pressing (HIP) technology was successfully developed and qualified to join the FW materials of Beryllium, CuCrZr alloy and 316L(N) stainless steel (SS). Alternatively an explosion bonding technology is qualified recently to provide bimetallic CuCrZr/SS plates. This technology provided enough margins for both tensile strength and grain size of the Copper alloy to ITER requirement.
Various small scale mock-ups have been manufactured to evaluate the size effect of Be tiles and the manufacturing variants for optimization. The mock-ups were tested in Efremov Research Institute at 4.7 MW/m2 for 7500 cycles and 5.9 MW/m2 for 1500 cycles. According to the test result, the maximum Be tile size shall be less than 16x16 mm2 while the 12x12 mm2 Be tile is acceptable. Post-HHFT examination showed cracks along Be/Cu interface in the Ti and Cu diffusion layers for the failed mock-up. The crack may initiated from coated pure Copper at the Be tile corner, where oxidization was observed and thermo-mechanical analysis showed higher stress than other areas. To improve the HHFT performance, the thickness of the compliant Cu layer should be optimized.
The acceptable Be tile is too small for manufacturing large scale FW panel. Possibility to use 51x12mm2 Be tile by castellation was investigated. Mock-ups have been manufactured and the HHFT was done at 4.7 MW/m2 for 16000 cycles. In addition, more mock-ups will be manufactured to evaluate the effect of artificial defects at Be/Cu interface for the purpose to establish an acceptance criteria for the future series products. At the same time, in parallel an EHF FW semi-prototype is being manufactured and will be qualified by HHFT in 2015. The semi-prototype is manufactured by a combination procedure of explosion bonding, HIP joining, laser welding and TIG welding. Various R&Ds have been carried out and the technologies have been qualified according to the relevant ITER specification and standards.
| Country or International Organisation | China |
|---|---|
| Paper Number | FIP/P4-10 |
Primary author
Prof.
Jiming Chen
(Southwestern Institute of Physics)
Co-authors
Mrs
Danhua Liu
(Southwestern Institute of Physics)
Dr
Erwu Niu
(ITER Chinese Domestic Agency)
Dr
Fanya Jin
(Southwestern Institute of Physics)
Dr
Gervash Alexander
(Efremov Research Institute)
Prof.
Jihong Wu
(Southwestern Institute of Physics)
Dr
Kuznetsov Vladimir
(Efremov Research Institute)
Dr
Liman Bao
(ITER organization)
Prof.
Liru Shen
(Southwestern Institute of Physics)
Dr
Pinghuai Wang
(Southwestern Institute of Physics)
Prof.
Xiang Liu
(Southwestern Institute of Physics)
Prof.
Xuru Duan
(Southwestern Institute of Physics)
Mr
Zongqin Li
(Southwestern Institute of Physics)
Mr
xiaobo Zhu
(Southwestern Institute of Physics)
