[en] Block diagram for calculating seismic resistant components of NPPs with WWER and RBMK reactors is described. The block diagram is used for evaluating seismic risk and determining volumes of investigations into seismic resistance of NPP components. The block diagram demonstrates a complex approach to the substantiation of pipeline seismic resistance representing the necessity of evaluation of building structures, where supporting elements of pipelines and components are placed, and tying up of component and pipeline lay-out with lay-out of NPP other elements