Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (7): 0-070605-10.doi: 10.11889/j.0253-3219.2019.hjs.42.070605


The optimization of flow rate distribution design of 373 MW molten salt reactor-liquid fuel

Qingyuan LI1,2,Bo XU1,Chong ZHOU1,Yang ZOU1(),Hongjie XU1   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-11-19 Revised:2019-03-25 Online:2019-07-10 Published:2019-07-16
  • Contact: Yang ZOU
  • About author:LI Qingyuan, male, born in 1992, graduated from University of Science and Technology of China in 2015, master student, focusing on thermal hydraulics of the MSR with liquid fuel
  • Supported by:
    Supported by Shanghai Youth Science and Technology Talent Sailing Project(No.17YF1423900)

Abstract: Background

Flow rate distribution design is one of the main contents of the thermal hydraulics study of molten salt reactor, because the flow rate distribution among all salt channels directly determines the location and peak value of local hotspots, which seriously affects the safety and reliability of the reactor operation.


This study aims to improve the uniformity of mass flow rate distribution among salt channels of 373 MW molten salt reactor named TMSR-LF2 (Thorium Based Molten Salt Reactor - Liquid Fuel).


First of all, the computational fluid dynamics program Fluent 15.0 was employ to is numerically simulate core flow field. Then the uniformity of structure optimization of upper plenum and lower plenum from several thermal-hydraulics characteristics were concluded according to the simulation output. Finally, several step-by-step improvement schemes were proposed.


The schemes of inserting the cylindrical baffle plate can effectively suppress the eddy within the lower plenum and eliminate the radial inhomogeneity of the flow rate. Increasing the height of the upper plenum can balance the pressure drop of inner and outer channels on the radial direction to improve the flow rate uniformity. Reducing the radius of the inner channels on the metal support plate will bring about a platform area of flow rate among inner salt channels and the overall trend will be more gentle.


The modification results showed that the improvement methods mentioned above has important reference value for the further optimization design of MSR-LF.

Key words: MSR-LF, Flow rate distribution, Structure optimization, Computational fluid dynamics (CFD)

CLC Number: 

  • TL2