Numerical study on sodium-water reaction mechanism in the gas phase using counter-flow reaction region

Sogabe, Joji; Takata, Takashi*; Yamaguchi, Akira*; Kikuchi, Shin; Ohshima, Hiroyuki

Journal of Nuclear Science and Technology, 49(11), p.1067 - 1077, 2012/11

https://doi.org/10.1080/00223131.2012.730897

Sodium water reaction (SWR) is a design basis accident of a sodium-cooled fast reactor (SFR). In a steam generator (SG) of the SFR, when a heat transfer tube fails, highly pressurized water or water vapor will leak into liquid sodium resulting in a chemical reaction between sodium and water or water vapor. The mechanisms of the SWR are complicated and have not been fully elucidated. The authors have developed a numerical code and have carried out SWR experiments of a counter-flow diffusion flame (in gas phase). In this paper, the authors perform numerical simulations based on the experimental conditions to validate two chemical reaction models. In addition, sensitivity analyses are performed for various hydration numbers and water vapor flow velocities. It is founded that hydration reaction occurs somewhat in the gas-phase reaction and that influences of the water vapor flow velocity are not negligible mainly from the viewpoint of the reaction surface location.

None

; ; *; *; Arii, Yoshio; ;

PNC TN9520 91-007, 54 Pages, 1991/06

PNC-TN9520-91-007.pdf:1.43MB

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Numerical study on sodium dynamics near reaction surface in counterflow of sodium and water vapor

Sogabe, Joji*; Yamaguchi, Akira*; Takata, Takashi*; Ohshima, Hiroyuki; Kikuchi, Shin

no journal, , 

Evaluation of sodium-water reaction phenomena is one of important safety issues in sodium-cooled fast reactors. In this study, we have considered sodium dynamics near reaction surface based on the experimental results, including concentration distributions of sodium, water vapor, and aerosol measured in counter-flow diffusion flame experiment of sodium and water.