Nuclear Techniques ›› 2014, Vol. 37 ›› Issue (09): 90605-090605.doi: 10.11889/j.0253-3219.2014.hjs.37.090605

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Analysis of the coolant reactivity coefficients of FHRs with 6Li contents of coolant

SUN Jianyou1,3 ZOU Yang1,2 YAN Rui1 ZHU Guifeng1 LI Guangchao1 CHEN Liang1,3 LI Dongcang3 XU Hongjie1,2   

  1. 1(Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China) 2(Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Chinese Academy of Sciences, Shanghai 201800, China) 3(School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China)
  • Received:2014-02-19 Revised:2014-04-23 Online:2014-09-10 Published:2014-09-09


Background: The 6Li in the coolant 2LiF-BeF2 of Fluoride-Salt-Cooled High Temperature Reactors, one type of generation IV, has a large microscopic thermal neutron absorption cross section. Purpose: The impact of 6Li concentration on the coolant temperature reactivity coefficient of Fluoride-Salt-Cooled High Temperature Reactors is reached. Methods: The coolant temperature reactivity coefficient was performed for Fluoride-Salt-Cooled High Temperature Reactors with different 6Li molar compositions of 2LiF-BeF2 as coolants by using the computer codes KENO in SCALE6 (Standardized Computer Analyses for Licensing Evaluation). Results: The neutron absorptive capability of 6Li in the coolant equals to that of 7Li when the 6Li mole content is 0.005%. The results are given that the coolant temperature reactivity coefficient is changing from negative value to positive value with increasing of the 6Li molar compositions of 2LiF-BeF2. Conclusion: Based on the analysis of the four factor formula, it can be concluded that the change of the thermal utilization coefficient mainly accounts for the increase of coolant temperature coefficient of reactivity.

Key words: Infinite bed, 6Li molar compositions, Macroscopic absorption cross section Σa, Four factors, Coolant temperature reactivity coefficient