Authors & Affiliations
Afremov D.A.1, Sapozhnikov I.S.1, Solonin V.I.2
1 N.A. Dollezhal Research and Development Institute of Power Engineering, Moscow, Russia
2 Bauman Moscow State Technical University, Moscow, Russia
Afremov D.A. – Director of thermophysics department, Cand. Sci. (Tech.).
Sapozhnikov I.S. – Engineer of 1st category. Contacts: 2/8, Malaya Krasnosel’skaya st., Moscow, Russia, 107140. Tel.: +7 (499) 763-03-49; e-mail:
Solonin V.I. – Professor of Department “Nuclear Reactors and Plants”, Dr. Sci. (Tech.).
Abstract
Organization of the flow in the pressure header of the reactor core of the BREST-OD-300 reactor facility, using assembley shanks with side pouring windows of various configurations, led to the implementation of the geometry of the coolant flow paths, which has previously not been investigated enough. To study the hydrodynamics of this area, an experimental plant has been developed in the laboratory “Reactor Thermal Physics” of the Moscow State Technical University. The experimental plant is an aerodynamic model of pressure header (scale 1:5) including the inlet chamber of the pressure header with the inlet section, support risers, base plate and fragments of the core, as well as 18 reflector shanks, 30 tails fuel assemblie shanks and their corresponding simulators of fuel rods. In order to validate the calculation methods, as well as to determine the flow rate transfer between the shanks, a computational model of the flow of the air in the tracts of the experimental section was developed using computational fluid dynamics (CFD) tools. The numerical model describes a close to isothermal turbulent flow of compressible air based on the Reynolds equations supplemented by the equations of the k-ε Realizable turbulence model. To determine the flow rates of air flowing between the shanks, the equation for the transfer of a passive impurity was used; the diffusion transfer of an impurity was not modeled. A matrix of transfer coefficients between the shanks was obtained, taking into account their configuration and relative position.
Keywords
pressure header, reactor core, BREST-OD-300, mass flow transfer, shank, fuel assembly, reflector, computational fluid dynamics, turbulence model
Article Text (PDF, in Russian)
UDC 621.039.517
Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2023, no. 4, 1:16