EDN: EYLTWJ
Authors & Affiliations
Belousov V.I., Dyachkov I.I., Ioannisian M.V., Pisarev A.N.
National Research Center “Kurchatov Institute”, Moscow, Russia
Pisarev A.N. – Senior Researcher. Contacts: 1, pl. Akademika Kurchatova, Moscow, Russia, 123182. Tel.: +7 (920) 898-60-76, +7 (499) 196-74-10; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Belousov V.I. – Head of Laboratory, Associate Professor, Cand. Sci. (Phys.-Math.).
Dyachkov I.I. – Senior Researcher, Cand. Sci. (Tech.).
Ioannisian M.V. – Head of Laboratory, Cand. Sci. (Phys.-Math.).
Abstract
For the KIR program (version S), algorithms for calculating neutron kinetics using the Monte Carlo method have been developed and implemented; they are currently undergoing verification and validation. The verification base of benchmarks containing the results of measurements of non-stationary processes is not as extensive as that of stationary processes, for which there are collections of critical (ICSBEP) and reactor (IHERPBE) experiments. However, there are several published benchmarks that allow validation of kinetics calculation algorithms, which include the benchmark experiment considered in this paper, conducted at the SPERT III research reactor facility in the 1960s. To verify the developed model of the SPERT III reactor core, a series of stationary calculations were performed in the KIR-C program. The simulation results are obtained for physical parameters such as the effective multiplication factor, the efficiency of absorber rods, and the kinetic parameters: the fraction of delayed neutrons βeff and the prompt neutron generation time Λeff. Non-stationary processes are calculated using approximate methods (adiabatic) and the direct Monte Carlo method taking into account delayed neutrons. The reactor periods in the adiabatic approximation were obtained for the entire series of experiments conducted at the SPERT III reactor facility. Demonstration calculations of neutron kinetics were performed for a series of boost experiments T-32, T-41, T-43, T-57, and T-70 without taking into account feedback. The results of neutron kinetics simulation without taking into account feedback showed good agreement with the experimental data. In addition, for the T-32 experiment, a cross-verification of the KIR-C program with the results of calculations using the Serpent 2 program was carried out. For a more accurate analysis of the results, it is necessary to carry out calculations of neutron kinetics taking into account feedback.
Keywords
neutron transfer equation, direct Monte Carlo method, precision calculations, neutronics codes, reactor core, SPERT III reactor facility, neutron kinetics, KIR-C program, adiabatic approximation, non-stationary calculation, mathematical benchmarks
Article Text (PDF, in Russian)
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Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2025, no. 2, 2:5
