Nuclear safety and waste management aspects of the EP ECRH upper launcher for ITER

摘要

An Enhanced Performance (EP) ECRH launcher is being developed for 1TER by several European institutions in a coordinated effort. The launcher must have an opening in the blanket, providing free pass-way for the mm-waves. The opening and void space inside the launcher significantly affect the radiation field in the vicinity of the launcher. It was found that the neutron streaming along the gap outside the launcher envelope frame does not dominate on the radiation environment at the back side of the launcher. A system of suitable codes and automated interfaces was used for the nuclear analyses including radiation transport and activation calculations in the 3D ITER geometry. The transport calculations were performed by the Monte Carlo code, MCNP5, running in parallel mode. The complex geometry of the launcher structure and the need to update on a short term the neutronic model were the reasons to use the McCad conversion tool for the automated generation of the MCNP models directly from the underlying CAD data. The activation calculations by the F1CPACT code have been used to study the waste management aspects of the launcher materials. The calculated shutdown contact dose rates and specific activities have been used to classify the activated launcher materials according to the French regulations for the waste and radiological zoning schemes applied to ITER.