Study on inherent neutron sources in MSR

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 t...

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Bibliographic Details
Published in:Nuclear science and techniques 2018-04, Vol.29 (4), p.146-154, Article 47
Main Authors: Ji, Rui-Min, Yu, Cheng-Gang, Li, Ming-Hai, Yan, Rui, Zou, Yang, Liu, Gui-Min
Format: Article
Language:English
Subjects:
Alpha-induced
Energy
Fuel
Hadrons
Heavy Ions
Inherent
MSR
neutron
Nuclear Energy
Nuclear Physics
salt
source
Photoneutron
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Summary: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.
ISSN:1001-8042
2210-3147
DOI:10.1007/s41365-018-0396-y