Dose rates in ITER maintenance areas: How to achieve acceptable values

Global dose rate assessment in ITER diagnostics ports based on the 3-D FEM ATTILA code

“…These values are relatively larger than those obtained in a recent work given in Ref. [18] in which the dose rate in the interspace extension of the equatorial port was also assessed with the Monte Carlo technique. This could partly attributed to the different calculation tools and data used (MCNP/FISPACT) but mainly due to the fact that the equatorial port plug in our case consists of four horizontal drawers stacked atop each other with straight gaps between them.…”

“…Nevertheless, the dose rate cited in Ref. [18] is still above the design limit of 100 Sv/h. To bring the interspace dose rates down to acceptable levels (by a factor of 4-5), a significant design alteration needs to be made.…”

Thermo-hydraulic analysis of the generic equatorial port plug design

“…Fig. 2 shows the nuclear heating volumetric loads as a result of the preliminary neutronic analysis of the port plug structure [8].…”