Thermo-structural analysis of integrated back plate in IFMIF/EVEDA liquid lithium target

The Engineering Validation and Engineering Design Activities (EVEDA) of the International Fusion Materials Irradiation Facility (IFMIF) are in progress under the Broader Approach (BA) Agreement. As a part of this engineering design, we carried out thermo-structural analysis of the back plate in the IFMIF target. In this analysis, the target assembly of the integrated back plate option was modeled with the nuclear heating to simulate the IFMIF normal operation. The thermal boundary conditions of a mechanical joint between the target assembly and the beam duct were employed as the calculation parameters. The calculated results showed the effects of these parameters on thermal stress and deformation were not large. The maximum von Mises stresses occurred at the back plate center and these values, 204–218 MPa were lower than half of the yield strength of F82H (455 MPa). The maximum displacement was about 0.3 mm which occurred at the back plate center also.