A probabilistic seismic risk assessment procedure for nuclear power plants: (II) Application

This paper presents the procedures and results of intensity- and time-based seismic risk assessments of a sample nuclear power plant (NPP) to demonstrate the risk-assessment methodology proposed in its companion paper. The intensity-based assessments include three sets of sensitivity studies to identify the impact of the following factors on the seismic vulnerability of the sample NPP, namely: (1) the description of fragility curves for primary and secondary components of NPPs, (2) the number of simulations of NPP response required for risk assessment, and (3) the correlation in responses between NPP components. The time-based assessment is performed as a series of intensity-based assessments. The studies illustrate the utility of the response-based fragility curves and the inclusion of the correlation in the responses of NPP components directly in the risk computation.

► Seismic risk assessments of a sample NPP is presented to demonstrate the PRA methodology proposed in its companion paper.
► The studies illustrate the utility of the response-based fragility curves in the risk computation.
► The correlation in the responses of NPP components is directly included in the risk computation.
► The number of simulations of NPP response required for risk assessment is discussed.