The current DRA methodologies mainly focused on the release of hazardous material caused by the structural damage of equipment. However, many real multi-hazard coupling scenarios indicated that the accident evolution was initiated by the unavailability of auxiliary systems and utilities available in the CPI. The unavailability of safety systems in place was a key factor in accident development . Besides, the current DRA methodologies were mainly developed on the basis of single hazard equipment vulnerability models. In the case of coupling multi-hazard scenario risk assessment, the risk value may be underestimated without full consideration of the multi-hazard coupling effects . The coupling forms of multiple hazardformative factors are manifold, and none of them can be ignored.