Numerical analysis of melt migration and solidification behavior in LBR severe accident with MPS method

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

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자료유형: 학술저널

저자정보: Jinshun Wang (Xi'an Jiaotong University) Qinghang Cai (Xi'an Jiaotong University) Ronghua Chen (Xi'an Jiaotong University) Xinkun Xiao (Xi'an Jiaotong University) Yonglin Li (Xi'an Jiaotong University) Wenxi Tian (Xi'an Jiaotong University) Suizheng Qiu (Xi'an Jiaotong University) G.H. Su (Xi'an Jiaotong University)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제54권 제1호

발행연도: 2022.1

수록면: 162 - 176 (15page)

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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 Pb?Bi 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 research results indicate that the MPS method has unique advantage in studying the migration and solidification behavior in LBR severe accident.

#MPS method #Severe accident #Migration and solidification #Numerical simulation

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