The processes of producing reactor-grade hafnium are investigated. It is shown that the electron beam melting method is effective for purification of hafnium from metallic impurities. The use of deoxidizing additives makes it possible to purify hafnium from oxygen, and carrying out a vacuum-thermal treatment of the initial charge provides the necessary nitrogen content
The possibilities of applying the methods and models of interval analysis, which take into account the uncertainties in the specification of data for Zr1%Nb alloys, to more accurately determine the relationship between the microhardness of Zr1%Nb alloy samples and the content of oxygen in them, have been investigated. The correctness of the application of methods and models of interval analysis for processing the results of experiments to study the properties of nuclear materials is shown.
The physical grounds and an experimental study of the efficiency of applying the zone recrystallization method in an electric field for zirconium refining from metal and gas-forming impurities are presented. The changes in the elemental composition, microhardness, and structure of the obtained ingots was investigated. It is shown that the application of the method can significantly reduce the content of interstitial impurities. Zirconium samples with a purity of 99.91 wt.% were obtained.
The results of studies of parameters, characteristics and performance of NPP units by mathematical modeling methods using computer-integrated technologies for their implementation, which allow to simulate many functional states of systems and equipment of NPP units during the simulation experiment are presented. The general structure of interaction of blocks of software complex for analysis of efficiency of work and parametric diagnostics of NPP units with WWER is developed. The structure of the block of programs of parametric diagnostics of equipment of NPP units is presented. The essence of methods and approaches of parametric diagnostics of power unit equipment is considered.
The regularities of creep, mechanical characteristics, and structure evolution of Zr1Nb nanocrystalline alloy obtained by intensive plastic deformation and hydrogenated from a gaseous medium are studied. It is shown that, due to deformation under creep conditions, a small amount of zirconium hydrides is formed in the structure of the Zr1Nb alloy, which has little effect on its strength properties and ductility. The observed features of the creep
characteristics are mainly due to the past relaxation of internal stresses and the corresponding structural transformations during hydrogenation and subsequent deformation.
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