With global warming,the demand for diversified energy sources has increased significantly.Trans-portable microreactors are important potential supplements to the global power market and are a promising develop-ment direction.This paper describes a 5 MW integrated long-life S-CO2 cooled vehicular microreactor(VMR)design based on tristructural isotropic(TRISO)fuel parti-cles that aims to provide electricity for industrial power facilities,remote mines,and remote mountainous areas that are not connected to central power grids.First,to facilitate transportation,flexible deployment,and simplified opera-tion and maintenance requirements,the VMR core and auxiliary system were designed to be reasonably small and as simple as possible.Second,the TRISO fuel particles used in the proposed VMR offer excellent properties,such as high inherent security and nonproliferation,which are vital for reactors in remote areas.In addition,a long core lifetime was achieved using the compact core design and enhanced fuel loading capacity,which is challenging when using TRISO as fuel.Finally,to make the VMR econom-ically competitive in terms of improved neutron perfor-mance and fuel efficiency compared to similar designs,large-size TRISO particles and tube-in-duct fuel assembly were utilized and different core configurations were schemed and simulated to obtain the design that best sat-isfied the proposed criteria.The lifetime and burnup in the final optimized VMR were satisfactory at 21 years and 43.9 MWd/kgU,respectively,with an adequate shutdown margin and excellent safety parameters to ensure safe operation.

Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China

[1]Fang-Yuan Zhang;Gui-Feng Zhu;Yang Zou;Rui Yan;Hong-Jie Xu-.Conceptual design and neutronic analysis of a megawatt-level vehicular microreactor based on TRISO fuel particles and S-CO2 direct power generation)[J].核技术（英文版）,2022(06):18-33

neutronic,megawatt,tristructural,nonproliferation,schemed,burnup,MWd,kgU

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