The CFD Modeling of Coolant Flow in Fuel Assembly - Current Results and Their Application

K. Klučárová, J. Remiš / VUJE, Inc. / Slovakia

16th Symposium of AER on VVER Reactor Physics and Reactor Safety (2006, Bratislava, Slovakia)
Reactor Dynamics, Thermal Hydraulics and Safety Analysis


The paper summarises present works performed by VUJE, Inc. in the field of CFD simulation of coolant flow in fuel assemblies used in the VVER-440 reactors. These works are extension of the previous calculations presented on AER Symposium 2004 and their aim is the better understanding of coolant flow in different parts of fuel assembly. While the previous CFD simulations were focused on study of individual parameters influences on the coolant flow mixing in the upper part of fuel assembly (pin-wise power distribution, geometry of fuel assembly, by-pass flow and coolant flow in central tube), the present works are directed more to verification of previous calculations and joining of individual effects on coolant flow mixing in the upper part of fuel assembly, mainly in the thermocouple position. The main purpose of the CFD simulations of coolant flow in fuel assembly is to increase accuracy of temperature measurements placed at the output of fuel assemblies.

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