Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (7): 0-070603-5.doi: 10.11889/j.0253-3219.2019.hjs.42.070603


Standby shutdown modes and feasibility analysis of molten salt experimental reactor

Shihe YU1,Yafen LIU1,Pu YANG1,Ruimin JI1,Guifeng ZHU1,Bo ZHOU1,Xuzhong KANG1,Rui YAN1(),Yang ZOU1,Bing LAN2()   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2. Nuclear and Radiation Safety Center, Beijing 100082, China
  • Received:2019-03-28 Revised:2019-04-29 Online:2019-07-10 Published:2019-07-16
  • Contact: Rui YAN,Bing LAN;
  • About author:YU Shihe, male, born in1984, graduated from Harbin Engineering University with a master’s degree in 2012, focusing on reactor physics research
  • Supported by:
    Supported by Strategic Priority Research Program of Chinese Academy of Sciences (No.XDA02010000), Thorium Uranium Fuel Cycle Characteristics and Key Problem Research Project(No.QYZDY-SSW-JSC016)

Abstract: Background

Reactivity control design is one of the main contents of reactor neutronics design. Molten fluoride mixture was used as fuel in molten salt reactor (MSR). Due to the particularity of nuclear fuel, molten salt reactor is different from traditional solid fuel reactor in reactor design.


This study aims at feasibility analysis of shutdown modes with emphasis on the standby scheme.


The shutdown modes includes discharging fuel salt, injecting neutron poison into the core tube, changing the composition of fuel salts, changing the number of graphite cells. The 2 MW thorium molten salt reactor-liquid fuel (TMSR-LF1) model was taken as the reference reactor, and the calculation was completed by using Monte Carlo N particle transport code (MCNP).


The analysis results show that injection of neutron poison into the core tube was a good alternative to shutdown the reactor when the control rod cannot be inserted into the core. The adjustable composition of fuel salts was the characteristic of MSR itself, thus, adding BF3, LiF-BeF2-ZrF4, LiF-ThF4 to fuel salts was a good way to adjust the reactivity. Changing the number of graphite cells could also shutdown the reactor.


The analysis of this study can provide technical reserves and theoretical reference for the shutdown modes of molten salt reactor.

Key words: Molten salt reactor, TMSR, Shutdown modes, Reactivity

CLC Number: 

  • TL3