Optimization of the Integrated Diagnostics in Equatorial Port Plug #3 of ITER for Minimal Interspace Dose Rate

Abstract

According to Internationa Thermonuclear Experimental Reactor (ITER) integration procurement arrangements, the installment of diagnostics in a port should not increase the shutdown dose rate (SDDR) in the port interspace area by no more than ~50 μSv/h above the baseline, assuming another 50 μSv/h is attributed to contribution from the port structure and other ITER in-vessel components, such that the upper SDDR limit of 100 μSv/h is not exceeded 106 s after shutdown. It was found that placing the initial design of the motional stark effect (MSE) and the charge exchange recombination spectroscopy (CXRS) in the equatorial port #3 resulted in an increase in the SDDR that far exceeded the limit. When we follow the optimization process discussed in this paper, substantial reduction in the port interspace SDDR was achieved. The results of this paper show that even when we combine the optimized CXRS and MSE diagnostics with a third glow discharge diagnostic, the excess of the SDDR over the baseline value did not exceed the allowed upper limit. This paper is based on utilizing the 3-D CAD-based ATTILA code for assessing the SDDR.