Layered Modeling of Event Sequence Diagram for Dynamic Reliability Analysis of Nuclear Power Plant

As the event sequence diagram (ESD) methodology is used for modeling the complex system, the event simply describes system configuration and status in order to control the size of the model, so the model can´t directly reflect the design and operation limitation. According to the hierarchy feature for the structure of nuclear power plant, a layered modeling of ESD is presented for marine nuclear power plant. Through introducing the fault tree analysis method and combining it with ESD, the weakness of the system can be found out. The ESD constructed through layered modeling is well arranged, distinct and with proper size, suitable for dynamic reliability analysis of nuclear power plant.