2D MPS method analysis of ECOKATS-V1 spreading with crust fracture model
نویسندگان
چکیده
Understanding the ex-vessel spreading behavior of molten core materials (corium) on reactor containment floor is great importance for designing, managing, and evaluating severe accidents light water reactors. Among some simulated corium experiments, temporal termination restart flow (stop-and-go) were highlighted in ECOKATS-V1 experiment, which simulant oxide melt (consisted 41% Al2O3, 24% SiO2, 19% CaO, 16% FeO) was released into a 1-D channel, seemed to have temporarily stopped restarted following crust formation breach at leading edge. The preceding study developed models Lagrangian-based Moving Particle Semi-Implicit (MPS) method analyze such spreading. However, applicability limited due numerical instability. In this study, timestep control MPS revised by newly introducing particle number density control, can efficiently reduce prevent instability when formed or breached low viscous flow. new successfully applied with different formations conditions. Namely, Solidification Viscosity Threshold (SVT) Crust Fracture Stress (CFST) melt. former determines threshold viscosity above fluid regarded as solid (crust). latter mechanical strength edge front. There remain issues future studies further develop more quantitative discussions.
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ژورنال
عنوان ژورنال: Nuclear Engineering and Design
سال: 2021
ISSN: ['0029-5493', '1872-759X']
DOI: https://doi.org/10.1016/j.nucengdes.2021.111251