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Numerical analysis of melt migration and solidification behavior in LBR severe accident with MPS method by Jinshun Wang; Qinghang Cai; Ronghua Chen; Xinkun Xiao; Yonglin Li; Wenxi Tian; Suizheng Qiu; G.H. Su is a Engineering article available to read on EtoBox.

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In Lead-based reactor (LBR) severe accident, the meltdown and migration inside the reactor core will lead to fuel fragment concentration, which may further cause re-criticality and even core disintegration. Accurately predicting the migration and solidification behavior of melt in LBR severe accidents is of prime importance for safety analysis of LBR. In this study, the Moving Particle Semi-implicit (MPS) method is validated and used to simulate the migration and solidification behavior. Two main surface tension models are validated and compared. Meanwhile, the MPS method is validated by the L-plate solidification test. Based on the improved MPS method, the migration and solidification behavior of melt in LBR severe accident was studied furthermore. In the PbeBi coolant, the melt flows upward due to density difference. The migration and solidification behavior are greatly affected by the surface tension and viscous resistance varying with enthalpy. The whole movement process can be divided into three stages depending on the change in velocity. The heat transfer of core melt is determined jointly by two heat transfer modes: flow heat transfer and solid conductivity. Generally, the r

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Author

Jinshun Wang; Qinghang Cai; Ronghua Chen; Xinkun Xiao; Yonglin Li; Wenxi Tian; Suizheng Qiu; G.H. Su

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Engineering (Physical Sciences)