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research-article

A Numerical Analysis Method of Impurity Precipitation on Mesh Wire of Cold Trap in Fast Breeder Reactor

[+] Author and Article Information
Akinori Tamura

Hitachi Ltd., Research & Development Group, 1-1, Omika-cho, 7-chome, Hitachi-shi, Ibaraki-ken, 319-1292 Japan
akinori.tamura.mt@hitachi.com

Shiro Takahashi

Hitachi Ltd., Research & Development Group, 1-1, Omika-cho, 7-chome, Hitachi-shi, Ibaraki-ken, 319-1292 Japan
shiro.takahashi.fu@hitachi.com

Hiroyuki Nakata

Hitachi-GE Nuclear Energy, Ltd., 1-1, Saiwai-cho, 3-chome, Hitachi-shi, Ibaraki-ken, 317-0073 Japan
hiroyuki.nakata.ma@hitachi.com

Akio Takota

Hitachi-GE Nuclear Energy, Ltd., 1-1, Saiwai-cho, 3-chome, Hitachi-shi, Ibaraki-ken, 317-0073 Japan
akio.takota.yn@hitachi.com

1Corresponding author.

ASME doi:10.1115/1.4039037 History: Received October 30, 2017; Revised January 10, 2018

Abstract

A cold trap is one of the important components in the FBR to control the impurity concentration of the liquid sodium. For accurate evaluation of the cold trap performance, the numerical analysis method which is based on the Lattice Kinetic Scheme (LKS) has been proposed. In order to apply the LKS to the impurity precipitation simulation of the cold trap, two models (the low Reynolds number model and the impurity precipitation model) have been developed. In this paper, we focused on the validation of these models. To confirm the validity of the low Reynolds number model, the Chapman-Enskog analysis was applied to the low Reynolds number model. As a result, it has been theoretically confirmed that the low Reynolds number model can recover the correct macroscopic equations (incompressible Navier-Stokes equations) with small error. The low Reynolds number model was also validated by the numerical simulation of two-dimensional channel flow problem with the low Reynolds number conditions which correspond to the actual cold trap conditions. The validity of the impurity precipitation model was investigated by the comparison to the precipitation experiments. In this comparison, the mesh convergence study was also conducted. These results have confirmed that the propose impurity precipitation model can simulate the impurity precipitation phenomena on the surface of the mesh wire. It has been also confirmed that the proposed impurity precipitation model can simulate the impurity precipitation phenomenon regardless of the cell size which were tested in this investigation.

Copyright (c) 2018 by ASME
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