EDN: KHCTPG
Authors & Affiliations
Zhirnov A.P., Lamanov S.A., Moiseev A.V., Soldatov E.O., Yufereva V.A.
N.A. Dollezhal Research & Development Institute of Power Engineering, Moscow, Russia
Zhirnov A.P. — Head of Department.
Lamanov S.A. — Engineer of 2nd Category. Contacts: 1, bld. 3, pl. Akademika Dollezhalya, Moscow, Russia, 107140. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Moiseev А.V. — Scientific Supervisor of the BREST-OD-300 Project, Cand. Sci. (Phys.-Math.).
Soldatov E.О. — Head of Group.
Yufereva V.А. — Head of Group.
Abstract
This paper presents the study of spatial effects during control rods worth measurement. Spatial effects are associated with changes in the spatial distribution of the neutron flux in the reactor core caused by control rods. Especisally, these effects are significant for flattened cores of fast reactors. Computational analysis of experimental series in the BFS-88 assembly of critical stand BFS-2 was performed for control rods worth measurments. BFS-88 assembly was designed for full-scale simulation of BREST-OD-300 reactor core. Worth was measured by two methods: approached source multiplication method and “run-away — rod-drop method”. The deviations of the control rods worth values obtained from the calculations of the conditionally critical problem from the experimental values are determined. Analysis of spatial effects was carried out. Spatial kinetics calculations of the assembly were performed for the process of absorber rods insertion with application of reactimeter program considering detectors’ positions during experiments. Detector’s and control rod’s mutual disposition influence on experimental result is studied. Spatial effects value is defined as the deviation of the control rods worth calculated from the detector readings from the worth calculated from the average neutron flux over the core. During the measurement of the total worth of control rods groups, spatial effects cause deviations for up to 27 %. Calculated worth ratio for various detectors coincides with the experimental one. Modeling was performed with the system of codes, developed in JSC NIKIET, including certified diffusion code FACT-BR and precision code MCU-BR.
Keywords
spatial kinetics, reactivity, control rods, delayed neutrons, fast reactors, BREST-OD-300, neutron-physical characteristics
Article Text (PDF, in Russian)
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UDC 621.039.51
Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2026, no. 1, 1:3
