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The paper provides some research results obtained from the application of the diagnostic systems based on noise analysis methods and presents the history of implementing of noise diagnostic systems starting from the first VVER up to the present time. The research considered physical peculiarities of defining vibration parameters of reactor internals and fuel assemblies, as well as other parameters important to safe VVER operation. The paper presents the spectrum of the noise component of neutron detectors located in the core and outside the reactor pressure vessel. The main attention is paid to the capability of the comprehensive system to present diagnostics of such tasks, as the definition of coolant rate through the core and temperature coefficient of reactivity.

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The article presents the use of the new Monte Carlo Serpent code for 3D modeling of the WWER-1000 reactor core. Core models for the first loading of RNPP4 and the 28th loading of SUNPP3, the fuel assemblies’ models of different manufacturers were developed and presented. Considerable attention was paid to the detailed modeling of the upper, lower and side reflectors. Validation calculations of the Monte Carlo Serpent code for the WWER-1000 reactor were performed on the basis of the first RNPP4 loading. For the 28th loading of SUNPP3, albedo coefficients for radial and axial reflectors were obtained.