Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2020, Vol. 31 ›› Issue (3): 27 doi: 10.1007/s41365-020-0740-x

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Effect of 37Cl enrichment on neutrons in a Molten Chloride Salt Fast Reactor

Liao-Yuan He1,2,3 • Guang-Chao Li4 • Shao-Peng Xia2,3 • Jin-Gen Chen1,2,3 • Yang Zou1,2,3 • Gui-Min Liu1,2,3   

  1. 1 University of Chinese Academy of Sciences, Beijing 100049, China
    2 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    3 CAS Innovative Academies in TMSR Energy System, Shanghai 201800, China
    4 Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
  • Received:2019-10-21 Revised:2020-01-06 Accepted:2020-01-18
  • Contact: Jin-Gen Chen
  • Supported by:
    This work was supported by the Chinese TMSR Strategic Pioneer Science and Technology Project (No. XDA02010000), the Frontier Science Key Program of the Chinese Academy of Sciences (No. QYZDY-SSW-JSC016), and the Nuclear Energy Development Project (No. 20154602098).
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Liao-Yuan He, Guang-Chao Li, Shao-Peng Xia, Jin-Gen Chen, Yang Zou, Gui-Min Liu. Effect of 37Cl enrichment on neutrons in a Molten Chloride Salt Fast Reactor.Nuclear Science and Techniques, 2020, 31(3): 27     doi: 10.1007/s41365-020-0740-x

Abstract: A molten chloride salt fast reactor (MCFR) is well suited to fuel breeding and the transmutation of transuranium (TRU) elements owing to its advantageous features of fast neutron spectrum and high TRU solubility. However, the neutron absorption cross section of 35Cl is approximately 1000 times greater than for 37Cl, which has a significant impact on the neutron physical characteristics of a MCFR. Based on an automatic online refueling and reprocessing procedure, the influences of 37Cl enrichment on neutron economy, breeding performance, and the production of harmful nuclides were analyzed. Results show that 37Cl enrichment strongly influences the neutron properties of a MCFR. With natural chlorine, 233U breeding cannot be achieved and the yields of S and 36Cl are very high. Increasing the 37Cl enrichment to 97% brings a clear improvement in its neutronics property, making it almost equal to that corresponding to 100% enrichment. Moreover, when 37Cl is enriched to 99%, its neutronics parameters are almost the same as for 100% enrichment. Considering the enrichment cost and the neutron properties, a 37Cl enrichment of 97% is recommended. Achieving an optimal neutronics performance requires 99% 37Cl enrichment.

Key words: Molten salt reactor, Molten chlorine salt fast reactor, 37Cl enrichment , Th–U fuel breeding