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Research Papers: Nuclear Power

Numerical Prediction and Optimization of Depressurized Sodium-Water Reaction Experiment With Counterflow Diffusion Flame

[+] Author and Article Information
Akira Yamaguchi1

Graduate School of Engineering, Osaka University, 2-1, Yamada, Suita, Osaka 565-0871, Japanyamaguchi@nucl.eng.osaka-u.ac.jp

Takashi Takata

Graduate School of Engineering, Osaka University, 2-1, Yamada, Suita, Osaka 565-0871, Japantakata_t@nucl.eng.osaka-u.ac.jp

Hiroyuki Ohshima

 Japan Atomic Energy Agency, 4002, Narita, O-arai, Ibaraki 311-1393, Japanohshima.hiroyuki@jaea.go.jp

Yoshitaka Kohara

Graduate School of Engineering, Osaka University, 2-1, Yamada, Suita, Osaka 565-0871, Japankohara_y@qe.see.eng.osaka-u.ac.jp

Yoshihiro Deguchi

 Mitsubishi Heavy Industry, 5-717-1, Fukahori-machi, Nagasaki 851-0392, Japanyoshihiro_deguchi@mhi.co.jp

1

Corresponding author.

J. Eng. Gas Turbines Power 131(2), 022907 (Jan 06, 2009) (7 pages) doi:10.1115/1.3043822 History: Received August 12, 2008; Revised August 22, 2008; Published January 06, 2009

Sodium-water reaction (SWR) is a design basis accident of a sodium-cooled fast reactor (SFR). A breach of the heat transfer tube in a steam generator results in contact of liquid sodium with water. Typical phenomenon is that the pressurized water blows off, vaporizes, and mixes with the liquid sodium. It is necessary to quantify the SWR phenomena in the safety evaluation of the SFR system. In this paper, a new computer program has been developed and the SWR in a counterflow diffusion flame is studied by a numerical simulation and an experiment. The experiment is designed based on the numerical simulation so that the stable reaction flame is maintained for a long time and physical and chemical quantities are measured. From the comparison of the analysis and the experiment, there exist discrepancies that may be caused by the assumptions of the chemical reaction. Hence, a new experiment is proposed to enhance the measurement accuracy and to investigate the reason of the disagreement. The authors propose a depressurized experiment and show the preliminary result of the experiment. It is found that a stable chemical reaction flame is formed. With the depressurization, it is expected that the flame location can be controlled and the reaction region becomes thicker because of decrease in the reactant gas density.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Sketch of the sodium-water reaction phases

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Figure 2

Sodium-water counterflow diffusion flame experiment

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Figure 3

Visualization of sodium-water reaction

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Figure 4

Aerosol mass concentration

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Figure 5

Modification of the sodium pool: (a) original geometry of the sodium pool and (b) modified geometry of the sodium pool

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Figure 6

Photo of the laser scattering by aerosols (bottom) and relative size of the aerosols measured by LII (top)

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Figure 7

Mass concentration of aerosols

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Figure 8

Concentration of the OH radical measured by LIF

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Figure 9

Sodium and water vapor mass concentrations

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Figure 10

Velocity vector above the pool surface

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Figure 11

Instantaneous temperature distribution

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Figure 12

Aerosol mass density for three cases

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Figure 13

Preliminary experimental result

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