[en] This paper describes the overall methods to handle the dependencies between human errors showed in shutdown PSA based on the insights from low power and shutdown PSA. This paper includes an evluation method of human dependencies in the context of human reliability analysis and how to model them in accident sequence analysis and quantify them. Many human actions are modeled in shutdown PSA because almost safety systems are manually operated during shutdown. Those human actions greatly affect the core damage frequency. In particular, it is very important to treat properly the dependencies of multiple human errors in the cutest level in the shutdown PSA