Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 1996, Vol. 7 ›› Issue (3): 143

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Investigation on two-phase critical flow for loss-of-coolant accident of pressurized water reactor

Xu Jin-Liang1 (徐进良), Chen Ting-Kuan2 (陈听宽), Yang Lu-Wei2 (杨鲁伟)   

  1. 1 Institute of Nuclear Energy Technology, Tsinghua University, Beijing 100084;
    2 National Laboratory on Multiphase Flow, Xi'an Jiaotong University, Xi'an 710049
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Xu Jin-Liang(徐进良), Chen Ting-Kuan(陈听宽), Yang Lu-Wei(杨鲁伟). Investigation on two-phase critical flow for loss-of-coolant accident of pressurized water reactor.Nuclear Science and Techniques, 1996, 7(3): 143

Abstract: The previous investigations were mainly conducted under the condition of low pressure, however, the steam-water specific volume and the interphase evaporation rate in high pressure are much different from those in low pressure. Therefore, the new experimental and theoretical investigation are performed in Xi'an Jiaotong University. The investigation results could be directly applied to the analysis of loss-of-coolant accident for pressurized water reactor. The system transition characteristics of cold leg and hot leg break loss-of-coolant tests are described for convective circulation test loop. Two types of loss-of-coolant accident are identified for hot leg break, while three types for cold leg break and the effect parameters are studied. Critical flow rate is dependent not only on the upstream fluid properties but also on the break geometries. Tests indicate that the mass flow rate with convergent-divergent nozzle reaches the maximum value among the different break sections at the same inlet fluid condition because the fluid separation does not occur. A wall surface cavity nucleation model is developed for prediction of the critical mass flow rate with water flowing in convergentdivergent nozzles.

Key words: Critical flow, System transition characteristic, Wall surface cavity nucleation model, Pressurized water reactor