Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (7): 70605-070605.doi: 10.11889/j.0253-3219.2017.hjs.40.070605

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Feasibility analysis on passive shutdown device with high temperature shearing trigger absorber ball

QIAO Yankai1,2,3, CAO Yun1, CHENG Maosong1, DAI Zhimin1,2,3   

  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. ShanghaiTech University, Shanghai 201210, China
  • Received:2017-03-16 Revised:2017-04-12 Online:2017-07-10 Published:2017-07-10
  • About author:10.11889/j.0253-3219.2017.hjs.40.070605
  • Supported by:
    Supported by Strategic Pilot Science and Technology Project of Chinese Academy of Sciences (No.XD02001005)

Abstract: Background: The passive shutdown system is an important safety guarantee for the nuclear energy system in case of accidents. Purpose: This study aims to analyze the feasibility of the passive shutdown device with high temperature shearing trigger absorber ball to ensure and enhance the safety of thorium-based molten salt reactor (TMSR) nuclear energy system. Methods: Based on the mechanical properties steep drop from 650 ℃ to 700 ℃ of inconel 625 alloy, a thin-wall baffle made of this alloy is designed as the high temperature shearing trigger structure. The steady state and transient fault fracture simulation of the two dimensional structure are carried out by Abaqus software at different temperatures under accident conditions. Results: The simulation results show that the thin-wall baffle cracks within 4-10 s when the preset temperature exceeds 650 ℃ and continues rising. While it will not fracture under the non-accident condition when the temperature rises to 670 ℃ and then reduces immediately. Conclusion: The high temperature shearing trigger structure can reliably fracture to trigger the passive shutdown system under the emergency condition, and further enhance the safety of thorium-based molten salt reactor.

Key words: Passive shutdown, High temperature shearing, Inconel 625 alloy, Abaqus, Fracture simulation

CLC Number: 

  • TL351.1