International Thermonuclear Experimental Reactor (ITER) diagnostic port plugs perform many functions including nuclear shielding, structural support of diagnostic system, while allowing for diagnostic access to the plasma. With design advancing, the in-port diagnostic components are integrated into the port plug structure, and the diagnostic shield modules (DSM) are customized to accommodate the in-port diagnostic components. This technical note summarizes results of transient electro-magnetic analysis using Opera 3d in support of recent design activities for ITER diagnostic equatorial port plug (EPP). A complete distribution of disruption loads on each component in EPP9 is presented. Impacts of different design features, such as the locations of the electrical contact, to the EM loads are discussed, and solutions for improving the port structure design are proposed.