Abstract
The Dual Coolant Led Lithium (DCLL) blanket is one of the concepts being investigated as candidate for DEMO, due to the high thermal efficiency provided by the flowing PbLi self-cooled breeder at ≈700°C in the high temperature design. Key elements are the Flow Channel Inserts (FCIs) serving as electrical and thermal insulators to mitigate MHD effects and to keep the He-cooled steel walls below its maximum allowable temperature due to corrosion. A material based on sandwiching porous SiC between dense SiC layers is proposed for FCIs. In this work results of theoretical calculations and an FEM model are presented to determine the optimum thickness of both porous core and outer dense layers to assure the required thermal insulation across the FCI with minimum thermal stresses, considering achievable properties for the porous SiC material and its fabrication possibilities. It is concluded that the porous core thickness must be at least 5mm if a porous SiC with thermal conductivity around 7W/mK is used; a dense coating of ≈200µm is considered as optimum regarding the thermal stresses present in the FCI.
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