Tritium transport analysis of HCPB blanket for CFETR

Based on the HCPB (Helium-Cooled Pebble Bed) blanket of CFETR (Chinese Fusion Engineering Testing Reactor), a more detailed tritium cycle model of HCPB blanket was developed by modeling the breeding parts inside the blanket separately. Utilizing the detailed model, tritium transport analysis of HCPB blanket was carried out. The outputs of the model were the tritium concentrations and tritium retentions at different positions, tritium extraction rate by TES (Tritium Extraction System) and by CPS (Coolant Purification System) and the tritium losses of blanket. In addition, sensitivity analysis of key parameters' influence on tritium losses and tritium extraction rate by TES was performed. The tritium transport analysis provides valuable reference for the design of HCPB blanket.