Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (9): 90603-090603.doi: 10.11889/j.0253-3219.2020.hjs.43.090603


Experimental study on nitrate natural circulation loop

Bo ZHANG1,2,3,Bo XU1,2,3,Chong ZHOU1,2,3(),Yang ZOU1,2,3,Xiaohan YU1,2,3   

  1. 1.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2.Innovative Academies in TMSR Energy System, Chinese Academy of Sciences, Shanghai 201800, China
    3.University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2020-05-08 Revised:2020-06-02 Online:2020-09-15 Published:2020-09-09
  • Contact: Chong ZHOU
  • About author:ZHANG Bo, male, born in 1992, graduated from Harbin Engineering University in 2016, master student, focusing on thermal hydraulics design on MSR
  • Supported by:
    Shanghai Youth Science and Technology Talent Sailing Project(17YF1423900)

Abstract: Background

Nitrate natural circulation loop (NNCL) system is an important platform for studying molten salt natural circulation characteristics. The experimental data can be used to develop or validate thermal-hydraulic analysis codes.


This study aims to explore natural circulation characteristics of nitrate and verify the functional relationship of related parameters.


Different experimental conditions were obtained by controlling the temperature of molten salt pool at 310, 340, 370 centigrade and the opening of air cooling tower throttle at 0%, 25%, 50%, 75%, 100%. Both the transient and steady state characteristics were observed. Combining theoretical analysis and experimental data, the analytical solution was obtained by the method of fitting approximation.


The response time of the temperature difference of the DRACS heat exchanger (DHX) to the temperature change of molten salt pool is more than 20 h, and the response time to the wind speed change is several minutes. The natural circulation flow rate of nitrate in the NNCL system is proportional to the m-th power of DHX heat exchange power, and the resistance of the NNCL system is proportional to the (1-m)/m-th power of the flow; the m value of the NNCL system is between 0.47~0.49.


The relationship between the natural circulation flow-power of the DHX and the natural circulation pressure drop-flow is well verified by the experimental results.

Key words: Natural circulation, Nitrate, Thermal hydraulic

CLC Number: 

  • TL332