Passive cooling technology has been adopted by more and more designs of advanced PWRs, because of its benefits to simplifying the design of safety systems, to reducing mis-operations performed by operators during accidents, and to cutting the cost of operation and maintenance. This paper presents a dimensional analysis by means of the Hierarchical two-tiered scaling (H2TS) method for the heat transfer process in a general passive heat removal system (PHRS) based on the research in which the most important phenomenon was conducted by a code module. The comparison of calculation results of the prototype and the experimental facility designed by the dimensional analysis shows that a scaled-down experimental facility could not simulate the flashing phenomenon which is the most important phenomenon in this process perfectly. But we could introduce a dimensionless parameter related to the flashing and choose an appropriate experiment condition to reproduction the flashing in the scaled-down facility. Our work in this paper made a well foundation for future design and experimental research of the PHRS.

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