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Zsolt Téchy

Bio: Zsolt Téchy is an academic researcher. The author has contributed to research in topics: VVER & Boiler blowdown. The author has an hindex of 4, co-authored 7 publications receiving 57 citations.

Papers
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Journal ArticleDOI
TL;DR: The purpose of this work is to demonstrate that CFD codes can be used to model gas movement inside a containment during a severe accident, and to encourage the use of CFD in assessing the risk of losing containment integrity as a result of hydrogen deflagrations.

41 citations

Journal ArticleDOI
TL;DR: In this paper, the authors compare the predictive capabilities of computer codes concerning the ignition testing of PWR fuel assemblies and compare them with the results of the OECD/NEA Sandia Fuel Project.

15 citations

Proceedings ArticleDOI
01 Jan 2002
TL;DR: In this article, the authors used GASFLOW 2.1 to evaluate the hydrogen distribution in the containment during a beyond design basis accident in a VVER-440/213 plant.
Abstract: Hydrogen combustion may represent a threat to containment integrity in a VVER-440/213 plant owing to the combination of high pressure and high temperature. A study has been carried out using the GASFLOW 2.1 three-dimensional CFD code to evaluate the hydrogen distribution in the containment during a beyond design basis accident. The VVER-440/213 containment input model consists of two 3D blocks connected via one-dimensional (1D) ducts. One 3D block contains the reactor building and the accident localization tower with the suppression pools. Another 3D block models the air traps. 1D ducts represent the check valves connecting the accident localization tower with the air traps. The VVER pressure suppression system, called “bubbler condenser,” was modeled as a distributed heat sink with water thermodynamic properties. This model accounts for the energy balance. However, it is not currently possible to model dynamic phenomena associated with the water pools (e.g., vent clearing, level change). The GASFLOW 2.1 calculation gave detailed results for the spatial distribution of thermal-hydraulic parameters and gas concentrations. The range and trend of the parameters are reasonable and valuable. There are particularly interesting circulation patterns around the steam generators, in the bubbler tower and other primary system compartments. In case of the bubbler tower, concentration and temperature contour plots show an inhomogeneous distribution along the height and width, changing during the accident. Hydrogen concentrations also vary within primary system compartments displaying lower as well as higher (up to 13–20% and higher) values in some nodes. Prediction of such concentration distributions was not previously possible with lumped parameter codes. GASFLOW 2.1 calculations were compared with CONTAIN 1.2 (lumped parameter code) results. Apart from the qualitatively similar trends, there are, for the time being, quantitative differences between the results concerning, for example, pressure histories, or the total amount of steam available in the containment. The results confirm the importance of detailed modeling of the containment, as well as of the bubbler condenser and sump water pools. The study showed that modeling of hydrogen distribution in the VVER-440/213 containment was possible using the GASFLOW 2.1 code with reasonable results and remarkable physical insights.Copyright © 2002 by ASME

6 citations

Journal ArticleDOI
TL;DR: In this article, the effects of active and passive spray systems on the depressurization of a large break loss of coolant accident (LBLOCA) were investigated. But the authors focused on the VVER-440/213 containment, and the uncertainty margins of the maximum pressure are given in this case.

4 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the authors provided a review of what has been done in the literature with regard to hydrogen generation in severe accidents of nuclear power plants and identified the literature gaps and underlined the need of developing a systematic hydrogen management strategy.

61 citations

Journal ArticleDOI
TL;DR: In this article, the authors present the results of systematic work carried out using the commercial Computational Fluid Dynamics (CFD) software FLUENT to assess the concentration distribution of hydrogen in a typical Indian Nuclear Reactor Containment.

41 citations

Journal ArticleDOI
TL;DR: Both time-averaged velocity profile and turbulent intensity are well consistent with the experimental data and direct numerical simulation result, and a –5/3 energy decay is observed for a wide range of frequencies, satisfying the turbulent energy spectrum theory.

31 citations

Journal ArticleDOI
TL;DR: The results obtained for these experimental data using the advanced containment code GOTHIC and relatively coarse meshes, which are coarser than the ones typically used for the simulation with commercial CFD codes, but are still representative of the models which are currently affordable for a full containment analysis.

31 citations

Journal ArticleDOI
TL;DR: GASFLOW as mentioned in this paper is a three dimensional semi-implicit all-speed CFD code which can be used to predict fluid dynamics, chemical kinetics, heat and mass transfer, aerosol transportation and other related phenomena involved in postulated accidents in nuclear reactor containments.

28 citations