Sensitivity study on tritium transport in water cooled solid blanket of China Fusion Engineering Test Reactor

The Water Cooled Solid Blanket (WCSB) is selected as a basic choice of the CFETR blanket design, where the tritium would be bred by lithium and extracted subsequently in the tritium cycling loop. However, there always some inevitable losses exist during the tritium cycle due to the complexity of the system, which is considered as a big concern of the tritium self-consistency. In order to realize the tritium self-consistency of CFETR, a mathematical-physical model is developed to analyze the tritium transport in the WCSB. In the present work, the sensitivity study of some key parameters on tritium losses and inventories were conducted. It was found that the tritium transport in the WCSB is influenced by the (a) thickness of the tungsten which covers the first wall, (b) the concentration of the hydrogen in the coolant water and (c) the content of the water in the purge gas, etc.