Electromagnetic studies of the ITER generic upper port plug

Electromagnetic analysis of the ITER generic upper port plug was carried out to estimate the most severe load to which the in-vessel components would be subjected. Static and dynamic analyses based on expected EM loads were also performed to evaluate the structural behavior of the generic upper port plug. These analyses reveal that stress and displacement of the upper port plug structure exceed design guidelines when the structure is subjected to an upward fast VDE. Stiffening the upper port plug will decrease stress and the severity of potential displacement. The design of the middle part of the generic upper port plug was considered. Static and dynamic analyses for stress and displacement of the port plug indicate that the stiffened model satisfies structural design guidelines. Further improvements have been considered to achieve sufficient design margins for the generic upper port plug for ITER. A deep slit in the diagnostic first wall and the diagnostic shield module was designed to mitigate the EM load. Additional EM analysis confirmed the applicability of these proposals. Results confirm that the generic upper port plug structure is able to withstand plasma disruptions.