Nevinitsa V.A.1, Boyarinov V.F.1, Grol A.V.1, Fomichenko P.A.1, Volkov Yu.N.1,2, Kruglikov A.E.2, Shchurovskaya M.V.1,2
1 National Research Center “Kurchatov Institute”, Moscow, Russia
2 National Nuclear Research University “MEPHI”, Moscow, Russia
In this paper, using the JAR-HTGR and MCU-HTR programs, for the first time, a computational analysis of a series of experiments with the sequential installation of absorbing profiling elements into an internal reflector carried out during core loading was performed. In each series of experiments, after the installation of profiling absorbing elements at the boundary of the core and the internal reflector, the distribution of the rates of fission reactions of 235U in the diametrical direction of measurements was measured. After the measurements were carried out, the next pair of absorbing profiling elements was installed and to compensate for the negative reactivity, the height of the ball filling of the fuel rods of the core increased, after which the measurements were repeated. In the latter configuration, height measurements were also performed. The paper presents the results of calculations of the spatial distribution of the fission reaction rate of 235U over the height and diameter of the assembly. Calculation results are obtained for all experimental configurations and the influence of the location of absorbing profiling elements on the character of radial distributions of the rates of fission reactions is shown. For the last configuration, a computational analysis of experiments was also performed to measure the axial distributions of reaction rates in two channels of the core, one of which is located next to the introduced control rod.
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