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Registration Number

0221U101277, 0117U002636 , R & D reports

Title

Research of "Shelter" object fuel containing materials at conditions of the New safe confinement and elaboration of methodological and technological approaches to their conditioning

Head

Nosovskyi Anatolii V,

Registration Date

18-01-2021

Organization

Institute for Safety Problems of Nuclear Power Plants of the National Academy of Sciences of Ukraine

Description

 Objects of research - lava-like fuel-containing materials of the Shelter object; their physicochemical properties, processes that take place and / or took place in lava-like fuel-containing materials. The purpose of the work: - taking into account the world experience of modeling the consequences of severe accidents at nuclear power plants and the range of data on the properties of the interaction of melt materials of the core of the reactor (corium) with concrete (SSR) for use in the calculation model - Shelter facility (NSC - OU); - development of an updated model of evolution of the structure and physical and mechanical properties of lava-like PVM (LPVM) taking into account the complex of physicochemical processes that occurred during the accident and at the Shelter and will be observed in the NSC - OU; - development of methodological and technological approaches to the creation of methods of solid-phase conditioning of LPVM to ensure the conditions of long-term storage and / or their future disposal. Research methods - determination of the phase composition of materials by X-ray phase analysis; method of measuring microhardness; method of determining the strength of the axial load, the method of determining the volume of the pore channels to remove the working fluid from them during evaporation. Results and their novelty - Updated the model of evolution of the microstructure of LPVM Unit 4 of the Chernobyl NPP on the example of brown ceramics. The behavior of HDL is determined not by one or more physical and chemical processes, but by their relationship and interaction. For the first time, two new processes were discovered: radiation-stimulated phase formation and crystallization. The course of oxidation of uranium oxides UOx in inclusions is specified. Two more stages of microstructure evolution have been supplemented. The durations of the known and the durations of the new stages of the evolution of the microstructure are specified.

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Gabelkov Serhii V
Zhyhaniuk Ihor V
Skorbun Anatolii D.