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The power grid safety is achieved by eliminating or decreasing to an acceptable level of all grid operation-related hazards for the society and human beings. The development of the smart grid (SG) concept stipulates the need for implementing novel approaches to grid safety analysis and risk mitigation. These approaches must be developed considering the informational technologies and innovations. Nuclear Power Plants (NPPs) are an integral part of the existing and future grids. Safe and reliable operation of an NPP implies efficiency, safety, and reliability of the grid to which it is connected and vice versa. The paper presents principles and techniques of SG safety assessment based on accident risk-analysis using dynamical and hierarchical criticality matrices. The critically of the grid system failure is taken as a safety index. The SG safety assessment considering the NPP influence could be extended due to analysis and prediction of changes in the state of SG systems or changes in the failure probability caused by operational environment, other failures or time factor. The shut down of Zaporizhzhya NPP unit 2 was investigated by means of dynamical and hierarchical criticality matrices-based analysis.