Preliminary leakage reliability analysis of DFLL-TBM based on a combinational approach

Dual-functional lithium lead-test blanket module (DFLL-TBM) is designed to demonstrate and validate related technologies for the high-power density liquid metal blanket of fusion commercial demo reactors (e.g. FDS-II) and the He/LiPb dual-cooled multi-functional blanket of a fusion-driven sub-critical system (i.e. FDS-I). It is important to assess the reliability of DFLL-TBM due to its complexity. A new approach is proposed by combining the probabilistic fracture mechanics (PFM) method and the probabilistic safety assessment (PSA) method. A reliability analysis code for blanket modules is developed. One of the failure modes of DFLL-TBM, leakage failure, is analyzed as an example to demonstrate the capability of the combinational approach. Some key aspects that affect the leakage reliability of DFLL-TBM are identified.