EDN: OAECOY
Authors & Affiliations
Shaginyan R.A.1, Radostin A.F.2, Rykunov D.V.2
1A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
2 Joint-Stock Company TVEL, Moscow, Russia
Shaginyan R.A. – Junior ResearcherContacts: 1, pl. Bondarenko, Obninsk, Kaluga region, Russia, 249033. Tel: +7 (484) 399-70-00 (add. 80-56); e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Radostin A.F. – Head of Department.
Rykunov D.V. – Chief Specialist.
Abstract
This paper presents a computational assessment of various approaches and the fundamental feasibility of reproducing the spectral characteristics of the WWER-S reactor through traditional pellet-type modeling at the BFS-1 critical facility.
This paper researches two approaches to WWER-S reactor core modeling by conventional means. The first method involves applying the classical approach to reactor core modeling based on material balance conservation. The unit cell is selected so that the insertion or withdrawal of polyethylene rods recreates the spectral conditions corresponding to the movement of displacers in WWER-S fuel assemblies. The second method consists of selecting a unit cell for a state with fully inserted displacers (characterized by a harder neutron spectrum). In this case, the cell must be configured such that the placement of polyethylene rods in the driver’s inter-tube space allows for a transition to the spectrum and spectral indices typical of a WWER-S reactor with fully withdrawn displacers.
As a result of this research, it was concluded that the use of the first method is inappropriate for a reactor with a changing water-fuel ratio due to significant discrepancies in spectral indices, while the second method turns out to be positive and recommended for use for modeling on BFS by traditional means.
The unit cell obtained in this manner is recommended for simulating WWER-S reactor conditions at the BFS facility using traditional means, as well as for use as a driver surrounding a light-water central insert with MOX fuel rods.
Keywords
calculated modeling, BFS, WWER-S, neutron spectrum, cell, spectral indeces, pellet, driver
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. 2, 2:5
