Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (6): 60603-060603.doi: 10.11889/j.0253-3219.2017.hjs.40.060603

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Transient analysis of the integral small modular fluoride molten salt cooled high temperature reactor

XIE Xuesong1,2,3, CHENG Maosong1, HE Zhaozhong1, WANG Kai1, DAI Zhimin1,3   

  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 Shanghai Tech University, Shanghai 201210, China
  • Received:2017-03-01 Revised:2017-03-10 Online:2017-06-10 Published:2017-06-06
  • About author:10.11889/j.0253-3219.2017.hjs.40.060603
  • Supported by:
    Supported by Strategic Pilot Science and Technology Project of Chinese Academy of Sciences (No.XDA02050)

Abstract: Background:Safety and economy is the goal of the next generation of nuclear power system as important indexes in the development of nuclear power system. According to the characteristics of fluoride molten salt reactor, the concept of the integral small modular fluoride molten salt cooled high temperature reactor which uses natural circulation for residual heat removal is proposed. Purpose:This study aims to analyze the transient characteristics under two kinds of incidents:the reactivity insertion incident and the heat sink loss incident. Methods: Based on the basis of the steady state simulation, modified RELAP5-MS software is employed to analyze the two kinds of incidents. Results:In the case of the reactivity insertion incident, as a result of the existence of natural circulation, the coolant flow rate of core changes dynamically with the core temperature, and reaches a new steady state eventually. The power of the core reduces gradually because of the negative feedback, and the reactor shuts down eventually under the circumstance of heat trap loss incident. Taking no account of the residual heat removal system conservatively, the fuel assembly and the coolant temperature rise slowly. Fuel and coolant temperature are within safe limits within 140 h. Conclusion:The results show that natural circulation for residual heat removal in the first loop will guarantee the great safety features of the fluoride molten salt cooled high temperature reactor.

Key words: The integral small modular fluoride molten salt cooled high temperature reactor, RELAP5-MS, Natural circulation, Safety feature

CLC Number: 

  • TL333