Thermophysical aspects of diagnosis systems improving for the NPP first circuit

The results of a comprehensive analysis of unresolved thermal problems of resource management nuclear NPP with water-cooled VVER reactors. Identified current trends in the qualitative improvement of diagnostics and forecasting technical condition of the real elements and nuclear reactor systems in order to ensure the possibility of extending their life. Thermophysical aspects of physical processes that are capable of initiating potentially damaging defects to their elements and systems during the operation of the main energy types reactor installations are considered. Particular attention is paid to the causes of the emergence and development of latent damage in critical elements of the primary circuit critical to the safety of nuclear power plants. The features and the calculation methodology of the corresponding thermohydrodynamic and vibrational processes are analyzed, as well as the principal aspects of the main approaches to early automatic detection of the conditions of nucleation and subsequent development of anomalous and pre-emergency operational states in the elements and systems of active zones and heat exchange equipment of the first circuit of reactor plants. The complex of determining the physical, technical and diagnostic factors to be considered when developing a new generation of diagnostic systems for early automatic detection of the initial phases of potentially dangerous deviations of active zones heat-hydraulic modes parameters from regulated values.Thermophysical aspects of diagnosis systems improving for the NPP first circuit