An internal flood probabilistic safety assessment (IFPSA) identifies risk-significant flood areas, components and scenarios, and evaluates the risk that a nuclear power plant (NPP) faces under internal flood conditions. This paper draws a comparison between NPPs in operation and those in the design stage with regards to the performance of IFPSA, and the main differences are shown in such tasks as flood area identification, flood source and SSC identification, plant walkdown, flood scenario characterization, flood frequency quantification and flood consequence analysis. Specific cases are presented in order to illustrate the application of IFPSA in NPP design to assess risks, identify potential weak links and provide insights into possible design modifications regarding internal flood protection.

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