Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (11): 110601-110601.doi: 10.11889/j.0253-3219.2019.hjs.42.110601

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Influence of 7Li enrichment in FLi/FLiBe on Th-U conversion performancefor molten salt fast reactor

Jun ZHOU1,2,3,Jingen CHEN1,2,3(),Chenggang YU1,2,Chunyan ZOU1,2()   

  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:2019-08-26 Revised:2019-09-24 Online:2019-11-10 Published:2019-11-18
  • Contact: Jingen CHEN,Chunyan ZOU;
  • About author:ZHOU Jun, male, born in 1994, graduated from University of South China in 2016, master student, focusing on physical design on MSR
  • Supported by:
    Strategic Priority Research Program of Chinese Academy of Sciences(XDA02010000);Frontier Science Key Program of Chinese Academy of Sciences(QYZDY-SSW-JSC016)

Abstract: Background

Lithium is an important component of coolant in liquid molten salt reactor (MSR). The neutron absorption cross section of the isotope 6Li is much larger than that of 7Li. Hence, the content of 6Li in the coolant has an important influence on the Th-U conversion performance for MSR.


This paper aims to provide an appropriate reference for the choice of 7Li enrichment in the engineering design of molten salt reactor by studying the influence of 7Li enrichment in FLi/FLiBe on Th-U conversion performance for molten salt fast reactor (MSFR).


With the help of molten salt reactor reprocessing sequence (MSR-RS), neutron spectrum, 233U inventory, conversion ratio and 233U net production, evolution of Li and tritium production with 7Li enrichment from 99.5% to 99.995% were explored on MSFR with FLi and FLiBe, respectively.


The computation results show that MSFR with FLi has a better Th-U conversion performance than that with FLiBe, and the influence of 7Li enrichment on Th-U conversion performance becomes wake when 7Li enrichment is higher than 99.9%. Compared with the 99.995% 7Li enrichment, the Th-U conversion ratio of 99.9% 7Li enrichment decreases by about 1.6% and the tritium production increases by about 8%.


Considering the cost of enriching 7Li and the Th-U conversion performance, a 99.9% 7Li enrichment is recommended for MSFR with both FLi and FLiBe.

Key words: FLi, FLiBe, 7Li enrichment, Molten salt fast reactor, Th-U conversion

CLC Number: 

  • TL99