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Experimental study on start-up and steady state characteristics of passive residual heat removal system for 2 MW molten salt reactor

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  • Chen, Kailun
  • Meng, Zhaoming
  • Yan, Changqi
  • Fan, Guangming
  • Ding, Tao

Abstract

A full-scale passive residual heat removal system for 2 MW molten salt reactor has been designed and constructed to perform experimental studies. The present research aims at investigating the transient behaviors of natural circulation during the start-up process, as well as steady state characteristics of heat transport capacity and temperature distribution in the drain tank. It is seen that natural circulation will not initiate in the loop until boiling occurs in the heating section, which is resulted from the special structure of cooling thimble. In case of single-phase natural circulation in the cooling thimble, theoretical equations for predicting the flow rate are derived based on considerations of flow regime variation and heat exchange inside the loop. Six cooling thimbles have been used in the system. At normal operation temperature of 643 °C, each cooling thimble has a heat carrying capacity of 2665 W. It is found that for heat transfer from thimble tube to bayonet tube, radiation and conduction heat transfer dominate in steady state conditions and start-up transient, respectively. In addition, temperature distributions inside the drain tank suggest that molten salt may start to freeze even though the bulk temperature is much higher than the solidifying point.

Suggested Citation

  • Chen, Kailun & Meng, Zhaoming & Yan, Changqi & Fan, Guangming & Ding, Tao, 2018. "Experimental study on start-up and steady state characteristics of passive residual heat removal system for 2 MW molten salt reactor," Energy, Elsevier, vol. 147(C), pages 826-838.
    • Handle: RePEc:eee:energy:v:147:y:2018:i:c:p:826-838
    DOI: 10.1016/j.energy.2018.01.057
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    References listed on IDEAS

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    1. Wang, Yinfeng & Lu, Beibei & Chen, Haijun & Fan, Hongtu & Taylor, Robert A. & Zhu, Yuezhao, 2017. "Experimental investigation of the thermal performance of a horizontal two-phase loop thermosiphon suitable for solar parabolic trough receivers operating at 200–400 °C," Energy, Elsevier, vol. 132(C), pages 289-304.
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    3. Chen, Kailun & Yan, Changqi & Meng, Zhaoming & Wu, Xiangcheng & Song, Shaochuang & Yang, Zonghao & Yu, Jie, 2016. "Experimental analysis on passive residual heat removal in molten salt reactor using single cooling thimble test system," Energy, Elsevier, vol. 112(C), pages 1049-1059.
    4. Spinato, Giulia & Borhani, Navid & Thome, John R., 2015. "Understanding the self-sustained oscillating two-phase flow motion in a closed loop pulsating heat pipe," Energy, Elsevier, vol. 90(P1), pages 889-899.
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    Cited by:

    1. Wei, Tianyi & Zhang, Biao & Wang, Shuguang & Tan, Sichao & Li, Dongyang & Qiao, Shouxu, 2023. "Numerical analysis of passive safety injection driven by natural circulation in floating nuclear power plant," Energy, Elsevier, vol. 263(PE).
    2. Ding, Tao & Meng, Zhaoming & Chen, Kailun & Fan, Guangming & Yan, Changqi, 2020. "Experimental study on thermal stratification in water tank and heat transfer characteristics of condenser in water-cooled passive residual heat removal system of molten salt reactor," Energy, Elsevier, vol. 205(C).
    3. Wang, Zhiwei & He, Yanping & Duan, Zhongdi & Huang, Chao & Liu, Shiwen & Xue, Hongxiang, 2023. "Passive mitigation of condensation-induced water hammer by converging-diverging structures for offshore nuclear power plants," Energy, Elsevier, vol. 282(C).

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