Journal
NUCLEAR ENGINEERING AND TECHNOLOGY
Volume 54, Issue 1, Pages 162-176Publisher
KOREAN NUCLEAR SOC
DOI: 10.1016/j.net.2021.07.043
Keywords
MPS method; Severe accident; Migration and solidification; Numerical simulation
Categories
Funding
- National Key R&D Program of China [2018YFB1900100]
- Young Elite Scientists Sponsorship Program by CAST [2018QNRC001]
- National Natural Science Foundation of China [11875217]
Ask authors/readers for more resources
This study validated and utilized the Moving Particle Semi-implicit (MPS) method to simulate the migration and solidification behavior of melt in Lead-based reactor (LBR) severe accidents. The research found that the migration and solidification behavior are greatly influenced by surface tension and viscous resistance varying with enthalpy, and the whole movement process can be divided into three stages.
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available