EDN: ORJWHN
Authors & Affiliations
Manturov G.N., Grabezhnoi V.A., Egorov G.O., Panova D.V., Slyunyaev M.N., Gurkin D.V., Ulyakhin S.M.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
Manturov G.N. – Chief Researcher, Dr. Sci. (Tech.). Contact: 1, pl. Bondarenko, Obninsk, Kaluga Region, Russia, 249033. Tel.: +7 (484) 399-70-00 (add. 49-58); e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Grabezhnoy V.A. – Senior Researcher, Dr. Sci. (Phys.-Math.).
Egorov G.O. – Research Engineer.
Panova D.V. – Junior Researcher.
Slyunyaev M.N. – Research Fellow.
Gurkin D.V. – Research Intern.
Ulyakhin S.M. – Research Fellow.
Abstract
Currently, verifications and attestations works are very important for fast neutron reactors calculations. The use of domestic nuclear data based on system of group constants in the BNAB format are very important and plays a key role in these calculations.
As a result of long-term work at A.I. Leypunsky Institute for Physics and Power Engineering the CONSYST/BNAB-RF constant system based on the new Russian evaluated nuclear data library ROSFOND-2.24, which incorporates modern scientific and experimental knowledge has been developed. The new domestic version the ROSFOND-2.24 is intended to be the foundation for a new-generation constant system for both heigh-precision and engineering calculations.
The enhanced version of the CONSYST/BNAB-RF system includes a methodology for “collapsing” the initial 299-neutron and 127-photon multigroup constants into broader groups using accepted weighting spectra for averaging. It also facilitates the preparation of environment macroconstants utilizing a library of 200-group microconstants derived from the ROSFOND-2.24 ENDL, structured according to the VITAMIN-B7 energy grid (200 neutron and 47 photon groups).
This study investigates the efficiency of different “collapsing” schemes – from 299 to 82, 62, 56 and 28 groups for neutrons and from 127 to 47 groups for photons. The analysis is perfomed by calculating neutron and photon spectra using the MCNP5 code for an iron benchmark experiment (A1ARM-CF-FE-SHIELD-001). The results are compared against reference MCNP5 calculations utilizing 299 neutron groups and 127 photon groups, as well as calculations using the VITAMIN-B7 energy group structure.
Keywords
constant system, library of group constants, nuclear data files, neutron spectrum, photon spectrum, ROSFOND-2.24 database, COSYST/BNAB-RF system, CONSYST-2020.2 code, MCNP5 code, VITAMIN-B7
Article Text (PDF, in Russian)
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Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2025, no. 4, 4:1
