Authors & Affiliations

Zaytsev D.V., Churkin A.N., Ulyanovsky D.V., Sergeev S.G., Tomkovid B.G.
Experimental and Design Organization "GIDROPRESS", Podolsk, Russia

Zaytsev D.V. – Deputy Head of Department, Experimental and Design Organization "GIDROPRESS". Contacts: 21, Ordzhonikidze st., Podolsk, Moscow region, Russia, 142103. Tel.: +7(4967) 65-26-01; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Churkin A.N. – Head of Department, Cand. Sci. (Techn.), Experimental and Design Organization "GIDROPRESS".
Ulyanovsky D.V. – Principal Engineer, Cand. Sci. (Techn.), Experimental and Design Organization "GIDROPRESS".
Sergeev S.G. – Design Engineer, Experimental and Design Organization "GIDROPRESS".
Tomkovid B.G. – Programmer Engineer, Experimental and Design Organization "GIDROPRESS".

Abstract

Using the mixing grids (MGr) in the fuel assemblies (FA) allows to intensify heat transfer between coolant and fuel rods, to improve mixing of coolant over the FA cross-section and thereby to increase the departure from nucleate boiling (DNB). However, when using the MGr in which there are no cells around the fuel rods of the last row, coolant redistribution may take place, namely an increase of flow rate round the FA periphery and a decrease of flow rate in the central part. The studies were per-formed on the FA model representing a cross-section full-scale nonheated fragment of fuel rod bundle whose basic geometrical parameters in the cross-section are equivalent to TVS-2M bundle. Work was carried out at a small circuit of OKB “GIDROPRESS” aerodynamic test bench. Measurements showed that flow rate redistribution between the central part of fuel bundle and the periphery due to installation of MGr is negligible.

Keywords
mixing grid, pressure loss coefficient, FA model, FA peripheral cell, spacing grid, pressure drop, velocity field, fuel rod bundle, Reynolds number

Article Text (PDF, in Russian)

References

UDC 621.039

Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2018, issue 5, 5:9