Khalimonchuk V. Development, implementation and use of models of spatial kinetics to substantiate the safety of nuclear power reactors in Ukraine

The work is devoted to safety analysis and safety justification of Ukrainian power reactors of two types: RBMK-1000 and VVER-1000. The first part of the thesis considers peculiarities in calculating the space-time energy distribution in RBMK-1000 and describes the computer code developed by the author for safety analysis of RBMK-1000 in reactivity accidents and xenon transients with a full-scale three-dimensional description of the core. The thesis part devoted to VVER-1000 safety analysis justifies the need to use three-dimensional kinetic codes to analyze a series of accidents and transients to ensure adequate simulation and conservative results. The results of using the computer package to solve a number of problems for VVER-1000 safety assessment in the introduction of new fuel types and fuel cycles, as well as in safety analysis in reactivity accidents, are presented.