Authors & Affiliations

Mishchukov N.A., Aznabaev V.K., Mishin V.A., Kolesov V.V.
Institute of Nuclear Power Engineering “National Research Nuclear University “MEPhI”, Obninsk, Russia

Mishchukov N.A. – student, Institute of Nuclear Power Engineering “National Research Nuclear University “MEPhI”. Contacts: 1, Studgorodok, Obninsk, Kaluga region, Russia, 249030. Tel.: +7(930) 750-29-33; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Aznabaev V.K. – student, Institute of Nuclear Power Engineering “National Research Nuclear University “MEPhI”.
Mishin V.A. – student, Institute of Nuclear Power Engineering “National Research Nuclear University “MEPhI”.
Kolesov V.V. – associate professor, Cand. Sci. (Phys.-Math.), Institute of Nuclear Power Engineering “National Research Nuclear University “MEPhI”.

Abstract

The study investigated the effect of heterogeneous shielding on the preparation of macroconstants for various mixtures. By comparing the effective multiplication factor calculated using multigroup macroconstants of the mixtures obtained for the “infinite” and final geometries, it was determined how significantly the cross sections are shielded and how much this affects the criticality of the entire system.
The study is part of the research work on the analysis of the criticality of a fast physical stand (BFS) and is intended to work out the methodology for carrying out multigroup and continuous-energy calculations.
The work is carried out on the model of the benchmark BFS2-62-3A, which was carried out on the critical stand BFS-2 (IPPE, Obninsk) in 2000 to simulate the core of the BN-600 reactor with a hybrid U-Pu fuel load and a stainless reflector become. BFS is a set of tubes filled with pellets with different mixtures (uranium, sodium, steel, etc.).
The research tool is the software package SCALE-6.2.1. It consists of various control modules united by a common user interface.
The calculations of Keff and reaction rates were carried out by the CASAS6 criticality sequence of the SCALE software package using the KENO-VI Monte-Carlo code. During the work, the library ENDF/B-VII.1 was used with continuous and multi-group views of cross sections (252 and 56 groups). The preparation of the macroconstant libraries was done by the XSProc sequence of the SCALE soft-ware package using two different methods: BONAMI and CENTRM.
In addition to the experimentally obtained values, the values obtained using the MMKKENO, TRIGEX and Serpent software complexes were used for comparison.

Keywords
fast physical stand, benchmark, SCALE software package, CSAS6 sequence, multiplication factor, reaction rates, reactivity effect, continuous-energy cross sections, multigroup cross sections, shielding sections, heterogeneous shielding, macroconstants, preparation methods

Article Text (PDF, in Russian)

References

UDC 621.039.5

Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2019, issue 3, 3:9