The finite element code ANSYS is used to calculate the temperature and stressdistributions for the first wall of DFLL-TBM(dual functional lithium lead-test blanket module),for testing in ITER.Preliminary analyses indicate that not only the low temperature design rules,the well-known 3S_m rules,are satisfied for the first wall,but the additional high temperaturestructural design criteria for the creep damage limits and creep-ratcheting limits are met as well.
Magnetohydrodynamic(MHD)pressure drop in the Chinese Dual Functional LiquidLithium-lead Test Blanket Module(DFLL-TBM)proposed for ITER is discussed in this paper.Electrical insulation between the coolant channel surfaces and the liquid metal is required to reducethe MHD pressure drop to a manageable level.Insulation can be provided by a thin insulatingcoating,such as Al_2O_3,which can also serve as a tritium barrier layer,at the channel surfaces incontact with LiPb.The coating's effectiveness for reducing the MHD pressure drop is analysedthrough three-dimensional numerical simulation.A MHD-based commercial computational fluiddynamic(CFD)software FLUENT is used to simulate the LiPb flow.The effect on the MHDpressure drop due to cracks or faults in the coating layer is also considered.The insulatingperformance requirement for the coating material in DFLL-TBM design is proposed according tothe analysis.
