APR1400 SG Support Stress Evaluation According to ASME BPVC Section III subsection NB and NF

The integrity of SG support is important to prevent breach of pressure boundary that may results in release of radioactive coolant to the environment. Hence rigorous stress analysis is required to ensure intactness of structure for all operating condition. The SG support is welded into the primary head, hence the analysis model include support as well as part of primary head. The 2D axisymmetric model was created using ANSYS V.18.1 and analyzed for membrane and bending stress using linearized stress analysis post-process option. The resulting stresses for design and level A condition are within the allowable limits of ASME Section III, subsection NB and NF. In this study, the shell-type support system was re-evaluated in term of stress analysis. The stress condition in support shows that the current support can satisfy the requirements. A design for steam generator support had evaluated and analyzed by FEA method using ANSYS Workbench. The static structural analysis was conducted for some cases in some different positions. The analysis result was compared with ASME code limits to show that it follows the requirements. The report has verified the support's stress.