Numerical simulation analysis for the divertor plate of DEMO reactor

Liu, C.; Tobita, Kenji

The critical heat flux margin of the tungsten armour and the accommodation of the thermal stress between the cooling tube and the W armour was considered. The wall thickness of the F82H tube variation or as a constant were considered to analysis the heat removal capability of the cooling tube. It was found a nonlinear distribution of the peak temperature for the W armour and the top cooling tube with the tube bore rising. And q = 5 MW/m or under the value would be acceptable based on present engineering consideration. The structure coupled analysis indicated the primary stress of the cooling tube was safety, less than 50 MPa, but thermal stress would be closed to 3Sm due to the thermal expansion between W armour and F82H tube. Based on the coupled results, a thinner tube would be better than a thicker one by considering thermal conducting and thermal stress. Finally, for the issues on CHF and thermal stress, the possible optimizations were discussed.