3D tritium transport analysis for WCCB blanket based on COMSOL

As one of the CFETR candidate blanket schemes, Water-Cooled Ceramic Breeder (WCCB) blanket is being designed and developed by Institute of Plasma Physics, Chinese Academy of Sciences. Considering the safe operation of blanket, especially the radioactivity of tritium, it is crucial to study the tritium performance in the blanket, such as inventory, permeation, tritium taken by purge gas and release, which can likewise provide information for study and design of Tritium Extraction System (TES) and Coolant Purification System (CPS). Based on Finite Element Method (FEM), a more accurate three-dimensional model is set up using COMSOL Multiphysics. The influence of temperature distribution and velocity field of breeder zones on tritium transport is considered in the modelling. Finally, the tritium inventory, tritium permeation, tritium taken by purge gas and tritium release out of the blanket are calculated as well as the sensitivity analysis is conducted.