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Estimation Method for Residual Sodium Amount on Unloaded Dummy Fuel Assembly
| Title: | Estimation Method for Residual Sodium Amount on Unloaded Dummy Fuel Assembly |
| Authors: | Kawaguchi, Munemichi Browse this author | | Hirakawa, Yasushi Browse this author | | Sugita, Yusuke Browse this author | | Yamaguchi, Yutaka Browse this author |
| Keywords: | Sodium cooled fast reactor | | dummy fuel assembly | | residual sodium | | wet cleaning process | | capillary |
| Issue Date: | 2024 |
| Publisher: | Taylor & Francis |
| Journal Title: | Nuclear Technology |
| Volume: | 210 |
| Issue: | 1 |
| Start Page: | 55 |
| End Page: | 71 |
| Publisher DOI: | 10.1080/00295450.2023.2214261 |
| Abstract: | This study has researched an estimation method for the amounts of residual sodium film and sodium lumps on dummy fuel pins in the Japanese prototype fast breeder reactor Monju by fundamental experiments and demonstration experiments. The residual sodium amounts on the pin surface were measured using three types of test specimens: (a) single pin, (b) 7-pin assembly, and (c) 169-pin assembly. The single pin and 7-pin assembly experiments revealed that the withdrawal speed of the pins and improvement of the sodium wetting drastically increased the residual sodium amounts. Furthermore, the 169-pin assembly experiments measured the practical amounts of the residual sodium in the Monju dummy fuel assembly and demonstrated sodium draining behavior through small gaps between the pins. The estimation method includes four models such as a viscosity flow model, Landau-Levich-Derjaguin (LLD) model, an empirical equation related to the Bretherton model, and a capillary force model in a tube. These calculation results were comparable to the residual sodium amounts obtained by the experiments. In the tests of improving sodium wetting, the amounts of residual sodium on the test specimen were close to 1.4 times larger than those of the thin sodium film estimated by the LLD model. The increased amount of residual sodium by improving the sodium wetting was explained by the ratio of the adhesion energy (γSO－γSL). |
| Rights: | This is an Accepted Manuscript of an article published by Taylor & Francis in Nuclear Technology on 2024, available online: http://www.tandfonline.com/10.1080/00295450.2023.2214261. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/92674 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 河口 宗道
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