Nuclear Engineering and Technology

  • 제53권1호
  • /
  • Pages.93-102
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  • 2021
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Analysis of the flow distribution and mixing characteristics in the reactor pressure vessel

  • Tong, L.L. (School of Mechanical Engineering, Shanghai Jiao Tong University) ;
  • Hou, L.Q. (Nuclear Power Institute of China) ;
  • Cao, X.W. (School of Mechanical Engineering, Shanghai Jiao Tong University)
  • 투고 : 2020.03.31
  • 심사 : 2020.07.03
  • 발행 : 2021.01.25
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초록

The analysis of the fluid flow characteristics in reactor pressure vessel is an important part of the hydraulic design of nuclear power plant, which is related to the structure design of reactor internals, the flow distribution at core inlet and the safety of nuclear power plant. The flow distribution and mixing characteristics in the pressurized reactor vessel for the 1000MWe advanced pressurized water reactor is analyzed by using Computational Fluid Dynamics (CFD) method in this study. The geometry model of the full-scaled reactor vessel is built, which includes the cold and hot legs, downcomer, lower plenum, core, upper plenum, top plenum, and is verified with some parameters in DCD. Under normal condition, it is found that the flow skirt, core plate holes and outlet pipe cause pressure loss. The maximum and minimum flow coefficient is 1.028 and 0.961 respectively, and the standard deviation is 0.019. Compared with other reactor type, it shows relatively uniform of the flow distribution at the core inlet. The coolant mixing coefficient is investigated with adding additional variables, showing that mass transfer of coolant occurs near the interface. The coolant mainly distributes in the 90° area of the corresponding core inlet, and mixes at the interface with the coolant from the adjacent cold leg. 0.1% of corresponding coolant is still distributed at the inlet of the outer-ring components, indicating wide range of mixing coefficient distribution.

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참고문헌

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피인용 문헌

  1. Experimental study on flow distribution and mixing at the core inlet of double-loop small module reactor vol.152, 2021, https://doi.org/10.1016/j.anucene.2020.108010