Nuclear Techniques

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Thermal-hydraulics numerical analyses of molten salt pebble-bed reactor core inlet

FENG Quansheng1,2, XU Bo1,2, PAN Deng1,3, ZOU Yang1, XU Hongjie1   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Research Institute of Nuclear Power Operation, Wuhan 430223, China
  • Received:2016-11-04 Revised:2017-04-13 Online:2017-09-10 Published:2017-09-06
  • Supported by:

    Supported by Strategic Priority Research Program of Chinese Academy of Sciences (No.XDA0201002), Frontier Science Key Program of Chinese Academy of Sciences (No.QYZDY-SSW-JSC016)

Abstract:

Background: The flow field design at the core inlet has a particularly important influence on structure stability,temperature distribution and flow field of a small solid fuel salt reactor system.Purpose: This study aims to optimize the flow channel structure by analyzing the effect of the thermal-hydraulic characteristics.Methods: Base on the design of a small molten salt pebble-bed reactor,input parameters of the practical boundary conditions were adopted for simulation study using Fluent 16.0 of computational fluid dynamics (CFD).Thermal-hydraulic characteristics such as temperature field,flow field and pressure drop,of core inlet were simulated through changing the flow areas.Results: The computational results showed that when proportion of the flow area was in the range of[0,15.00%],the maximum local temperature in the active core region increased and the pressure drop in the core inlet decreased with the increase of the flow area.As the channel is far away from the core position,salt velocity increases gradually along the radial direction.Conclusion: The numerical results provide a useful proposal to optimize the design of a small solid fuel salt reactor.

Key words: Solid state molten salt reactor, Inlet flow distribution, Molten salt channel, Thermal-hydraulics

CLC Number: 

  • TL33