Mechanical Property Analysis of the Crucible-type Core Catcher Heat Exchanger
Based on the design of the core catcher in Tianwan NPP,a multi-physical coupling simulation model is built by the COMSOL software to simulate the operation of the crucible type core catcher in the initial stage of severe accidents in nuclear power plant.The results show that the bottom steel shell of the heat exchanger will melt.When the temperature of the corium formed by mixing the sacrificial material with the core melt exceeds 2100 K,a small amount of melting does not have a significant effect on the mechanical properties of the core catcher.In addition,the heat expansion in the central area of the vertical wall is very large,which will cause significant extrusion on the external cooling channel.Based on the above results,this paper proposes suggestions on the design of the crucible type core catcher and lays the foundation for the development of related equipment.
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