Authors & Affiliations

Dmitriev S.M., Dobrov A.A., Pronin A.N., Ryazanov A.V., Solntsev D.N.
Nizhniy Novgorod State Technical University n.a. R.E. Alekseev, Nizhniy Novgorod, Russia

Dmitriev S.M. – Rector, Dr. Sci.(Tech.), Institute of Nuclear Power Engineering and Technical Physics, Nizhny Novgorod State Technical University R.E. Alekseeva.
Dobrov A.A. – Senior Lecturer, Institute of Nuclear Power Engineering and Technical Physics, Nizhny Novgorod State Technical University R.E. Alekseeva.
Pronin A.N. – Senior Lecturer, Institute of Nuclear Power Engineering and Technical Physics, Nizhny Novgorod State Technical University R.E. Alekseeva. Contacts: 24, Minina st., Nizhny Novgorod, Russia, 603155. Tel.: +7(831) 436-80-17, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Ryazanov A.V. – Engeneer of the 2nd category, Institute of Nuclear Power Engineering and Technical Physics, Nizhny Novgorod State Technical University R.E. Alekseeva.
Solntsev D.N. – Associate Professor, Cand. Sci. (Tech.), Institute of Nuclear Power Engineering and Technical Physics, Nizhny Novgorod State Technical University R.E. Alekseeva.

Abstract

In the design of the RITM-200 reactor facility, it is planned to use an innovative reactor core, recruited from cased fuel assemblies. The structural features of such fuel assemblies necessitated the determination of certain important hydraulic characteristics, in particular, the study of the distribution of the coolant flow through the fuel assemblies cells at the entrance to the fuel bundle. These data are the input boundary condition for the conduct of the thermohydraulic calculation. In this paper, the methods and results of experimental and numerical modeling of hydrodynamic processes occurring in the input section of fuel assembly for the RITM-200 reactor facility are presented. The experimental part of the study was carried out on a high-pressure aerodynamic facility FT-50 of the laboratory "Reactor hydrodynamics" which is based in the NSTU R.E. Alekseeva. With the help of pneumometric probes, the values of relative axial velocities in several sections at the entrance to the bundle of fuel elements were obtained, moreover the values of static pressure drops in individual sections of the testl model. The calculation part is a CFD simulation using the program Ansys CFX 14.0. An automatic mixed calculated grid consisting of tetra-, hexa- and prismatic elements was generated. To close the system of Navier-Stokes equations, the model of turbulence of tangential stress transfer and the Reynolds stress model were considered. In this work, the calculated and experimental data are compared. The results of computer modeling can be used to form input boundary conditions for the programs of the zone-based calculation of the reactor core RITM-200 in order to take account of the uneven flow rate of the coolant in the cells at the inlet to the fuel bundle due to the design of the inlet section of the fuel assembly.

Keywords
nuclear reactor, reactor core, fuel assembly, computational fluid dynamics, coolant, simulation, CFD program

Article Text (PDF, in Russian)

References

UDC 621.039

Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants", 2018, issue 3, 3:16