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Experimental investigation on pressure-buildup characteristics of a water lump immerged in a molten lead pool

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Abstract

Motivated to understand the pressure-buildup characteristics in a circumstance of a water droplet immerged inside a heavy liquid metal pool, which is a key phenomenon during a Steam Generator Tube Rupture accident of Lead-cooled Fast Reactor, many experiments have been conducted by injecting water lumps into a molten lead pool at Sun Yat-sen University. In order to deepen the understanding of the influence of melt material, this lead experiment was compared with a Lead–Bismuth-Eutectic (LBE) experiment in the literature. For both experiments, a steam explosion occurred in a small part of the experimental runs, which generally leads to strengthened pressure buildup. Regarding the non-explosion experimental cases, the impact of all parameters employed in lead experiments (i.e., water lump volume, water lump shape, molten pool depth, and temperature of water and melt) on the pressure buildup is non-negligible and similar to that in our previous experiments using LBE. Notably, limited pressure buildup with an increase in water lump volume was also observed. A slightly more violent pressure buildup tends to appear in the lead experiments than in the LBE experiments under the same experimental conditions, which may be due to the higher thermal conductivity of lead than of LBE. In a few experimental runs with a relatively low melt temperature close to the melting point of lead, local solidification of liquid lead was observed, restricting pressure buildup. For the lead and LBE experiments, the calculated melt kinetic energy conversion efficiency η has a relatively small value (not exceeding 1.6%), and the η values have an overall positive correlation with the impulse on the molten pool.

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Data availability

The data that support the findings of this study are openly available in Science Data Bank at https://doi.org/10.57760/sciencedb.j00186.00022 and https://cstr.cn/31253.11.sciencedb.j00186.00022.

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Authors and Affiliations

  1. Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai, 519082, China

    Zi-Jian Deng, Song-Bai Cheng & Hui Cheng

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  3. Hui Cheng
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Zi-Jian Deng, Song-Bai Cheng and Hui Cheng. The first draft of the manuscript was written by Zi-Jian Deng and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Song-Bai Cheng.

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This work was supported by the Basic and Applied Basic Research Foundation of Guangdong Province (Nos. 2021A1515010343 and 2022A1515011582) and the Science and Technology Program of Guangdong Province (Nos. 2021A0505030026 and 2022A0505050029).

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Deng, ZJ., Cheng, SB. & Cheng, H. Experimental investigation on pressure-buildup characteristics of a water lump immerged in a molten lead pool. NUCL SCI TECH 34, 35 (2023). https://doi.org/10.1007/s41365-023-01188-1

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