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 (2): 17 doi: 10.1007/s41365-020-0730-z

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Study on dynamic characteristics of fission products in 2 MW molten salt reactor

Bo Zhou1,2 • Xiao-Han Yu1 • Yang Zou1 • Pu Yang1,2 • Shi-He Yu1 • Ya-Fen Liu1 • Xu-Zhong Kang1 • Gui-Feng Zhu1 • Rui Yan1   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-11-02 Revised:2019-12-27 Accepted:2020-01-01
  • Contact: Rui Yan
  • Supported by:
    This work was supported by the Chinese Academy of Sciences TMSR Strategic Pioneer Science and Technology Project (No. XDA02010000), and The Frontier Science Key Program of Chinese Academy of Sciences (No. QYZDY-SSW-JSC016).
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Bo Zhou, Xiao-Han Yu, Yang Zou, Pu Yang, Shi-He Yu, Ya-Fen Liu, Xu-Zhong Kang, Gui-Feng Zhu, Rui Yan . Study on dynamic characteristics of fission products in 2 MW molten salt reactor.Nuclear Science and Techniques, 2020, 31(2): 17     doi: 10.1007/s41365-020-0730-z

Abstract: In this study, a numerical flow model of the fission products (FPs) in the primary loop system of a molten salt reactor (MSR) was established and solved using Mathematica 7.0. The simulation results were compared with those of the ORIGEN-S program in the static burnup mode, and the deviation was found to be less than 10%, which indicates that the results are in good agreement. Furthermore, the FPs distribution in the primary loop system under normal operating conditions of the 2 MW MSR was quantitatively analyzed. In addition, the distribution phenomenon of the FPs under different flow rate conditions was studied. At the end of life, the FPs activity in the core region (including active region, and upper and lower plenum regions) accounted for 77.3%, and that in the hot leg #1, main pump, hot leg #2, heat exchanger, and cold leg region accounted for 1.2%, 16.15%, 0.99%, 2.5%, and 1.9%, respectively, of the total FPs in the primary loop under normal operating conditions. The proportion of FPs in the core decreased with the increase in flow rate in the range of 2.24–22,400 cm3 s-1 . The established analytical method and conclusions of this study can provide an important basis for radiation safety design of the primary loop, radioactive source management design, thermal–hydraulic safety analysis, and radiochemical analysis of FPs of 2 MW MSRs.

Key words: Molten salt reactor, Fission products, Radioactive source term, Primary loop system, Flow model