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 ›› 2018, Vol. 29 ›› Issue (4): 47 doi: 10.1007/s41365-018-0396-y

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Study on inherent neutron sources in MSR

Rui-Min Ji 1,2  Cheng-Gang Yu 1  Ming-Hai Li Rui Yan 1  Yang Zou 1  Gui-Min Liu 1   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Contact: Yang Zou
  • Supported by:

    This work was supported by the Chinese TMSR Strategic Pioneer Science and Technology Project under Grant No. XDA02010000.

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Rui-Min Ji, Cheng-Gang Yu, Ming-Hai Li, Rui Yan, Yang Zou, Gui-Min Liu. Study on inherent neutron sources in MSR.Nuclear Science and Techniques, 2018, 29(4): 47     doi: 10.1007/s41365-018-0396-y


The molten salt reactor (MSR) has received much recent attention. The presence of beryllium and the mixing of actinides with light nuclei in the fuel salt result in a relatively strong neutron source that can affect the surveillance at subcritical and transient characteristics during operation. In this study, we predict the inherent neutron sources based on a MSR model. The calculation shows that in the fresh core, the inherent neutron sources are mainly from alpha-induced neutrons. After power operation, the inherent neutron sources become remarkably stronger due to photoneutrons. Although being an insignificant part in the total neutron population during operation, the inherent neutron sources can be used as the installed neutron source after shutdown. If the MSR has continuously operated at full power (2 MWt) for 10 days, then there would be no need for the installed source within 80 days after shutdown. After operating constantly for 500 days, the installed neutron source can be eliminated within 2 years after shutdown.

Key words: MSR, Fuel salt, Inherent neutron source, Photoneutron, Alpha-induced neutron