Design of integrated passive safety system (IPSS) for ultimate passive safety of nuclear power plants.

Highlights: [•] We newly propose the design concept of integrated passive safety system (IPSS). [•] It has five safety functions for decay heat removal and severe accident mitigation. [•] Simulations for IPSS show that core melt does not occur in accidents with SBO. [•] IPSS can achieve the passive in-vessel retention and ex-vessel cooling strategy. [•] The applicability of IPSS is high due to the installation outside the containment. [Copyright &y& Elsevier]