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Information × Registration Number 0221U103495, 0119U101826 , R & D reports Title Development of power control methods for the perspective fast reactor with a wave of nuclear burning and modeling of materials for nuclear power of the next generation popup.stage_title Head Bakai Oleksandr S., Registration Date 21-02-2021 Organization National Science Center "Kharkiv Institute of Physics and Technology" popup.description2  1. Based of numerical calculations using the advanced computer two-dimensional code FANTENS-2D we study influence of parameters of a radial neutron reflector on conditions of existence and characteristics of a mode of a nuclear burning wave (NBW) in the fast cylindrical reactor with complicated axial and radial structure and metallic U-Pu fuel. The calculation results showed a significant dependence of the reactor characteristics on the material and structure of the radial neutron reflector. The obtained results prove the fundamental possibility of controlling the power and other parameters of a promising fast reactor in the self-supporting mode of NBW by choosing the composition of the radial neutron reflector, in particular, using a reflector of two layers: light material (graphite or beryllium, inner layer) and heavy one (Pb-Bi eutectic, outer layer). 2. In the classical nucleation theory formalism beyond the dilute solution approximation, the difference between the actual solute supersaturation and the nominal supersaturation due to the formation of subcritical transient solute clusters is considered. Based on their distribution function, an algebraic supersaturation equation is obtained, which combines the nominal supersaturation of a binary metastable solution with its actual supersaturation and the function of specific surface energy and temperature. The applicability of this approach is validated by comparison with simulation data on the kinetics of nucleation of the Al3Zr and Al3Sc second phases in model binary aluminum alloys. 3. The problem of nucleation of vapor bubbles in the pores of the order or less than the critical size (nanopores) is analyzed. Defects are modeled by conical nanopores, and the coolant fluid for simplicity and versatility is modeled by the van der Waals equation. The dependence of the bubble nucleation rate on temperature and pressure is obtained and a minimum pore size needed to reach the critical bubble size is derived. Product Description popup.authors Abyzov Alexander S. Borysenko Oleksandr O. Davydov Leonid M. Lazarev Mykola P. Malovytsia Maksym S. Pylypenko Volodymyr V. Turkin Anatoliy A. Fomin Serhii P popup.nrat_date 2021-02-21 Close