Streaming analysis for radiation through ITER mid-plane port

Two-dimensional shielding analyses have been performed on the maintenance and test module mid-plane ports in the International Thermonuclear Experimental Reactor (ITER). Nuclear responses in the toroidal field (TF) and poloidal field (PF) coils around these ports have been calculated. Shield plugs with 20-mm-wide gaps between the blanket modules exist in both ports. In the case of the test module port, they are installed at the back of a 500-mm-thick test module. In order to satisfy design limits, 540- and 150-mm-thick shield plugs are required for the maintenance and the test module port, respectively. In addition, nuclear responses as a function of the gap width have also been estimated. In the case of the 50-mm-wide gap, it is found that 750 and 390-mm-thick shield plugs are required for the maintenance and test module ports, respectively.