Event tree analysis for the system of hybrid reactor

The application of probabilistic risk assessment for fusion-fission hybrid reactor was introduced. A hybrid reactor system had been analysed using event trees. According to the character of the conceptual design of Hefei Fusion-Fission Experimental Hybrid Breeding Reactor, the probabilities of the event tree series induced by 4 typical initiating events were calculated under assumption that these initiating events were independent of each other. The results show that the conceptual design is safe and reasonable. The safety character of hybrid reactor system had been understood more deeply through this paper. Some suggestions valuable to safety design for hybrid reactor, such as to set up a passive cooling system independent of emergency power system, had been proposed.