Galchenko V. Numerical reactor kinetic models applicability for the reactivity accidence analysis on the NPPs with VVER-1000.

The dissertation is devoted to the reactivity accidence analysis for the VVER-1000 NPPs. The calculation analysis of this group of accidents was carried out with various reactor kinetic models utilizing which are most frequently used today at studying behavior of VVER-1000 active core. In the work analysis of influence plenty factors for preparation of macroscopically constants on results of the subsequent calculations of emergency sequences by three-dimensional kinetic codes is executed, that has enabled to generate a technique for macroscopically constants preparation. In view of suggested in work and techniques already existing in the standard practice on formation of initial and boundary conditions, the reactivity accidence analysis carried out at work a nominal reactor power level of capacity with use of various reactor kinetic models. For completeness of understanding of the received calculation results the stability analysis in the concentrated parameters has been lead, the stability diagram isreceived and generalizing conclusions about borders of applicability of reactor kinetic models for the reactivity accident analysis are made.