The present paper discusses the mutual relations between technical aspects and legal solutions in the case of operation of nuclear power plants. To this aim principles of critical infrastructure safety and legal aspects are taken into account. The problem of service continuity provision in the face of natural dangers like lightning is reported. The article refers to nuclear power plants (NPP) with the aim of underlining the problem’s importance. The discussion includes selected aspects of safety needs. The problem is discussed using a multidisciplinary approach. The role of international and national standardisation bodies is emphasised. Selected technical standards are quoted. The role of the legislator for service continuity provision is underlined. The present contribution gives a holistic overview on selected aspects of service continuity provision in case of critical infrastructure.