Rapid and accurate diagnosis of nuclear accident is the primary link of nuclear emergency. Signed directed graph SDG has good completeness as a common method for fault diagnosis, but the traditional SDG model has low diagnosis efficiency. As a representation method of causal relationship, information flow can be calculated and analyzed from a quantitative point of view, and the application of information flow to causal fault diagnosis can improve the diagnosis efficiency. In this paper, the information flow is introduced to improve the SDG mode...
