Modeling crust fracture and water ingression through crust during top-flooding strategy for corium cooling

摘要: Abstract During an LWR severe accident, top flooding strategy is usually used in order to achieve the coolability of corium. Water ingression phenomenon, where water percolates through cracks crust, identified as one phenomena that enhance heat removal during cooling corium via flooding. In this study, a model for phenomenon suggested. The assumes morphology fractured crust determined period before onset ingression. Especially, present predicts using two thermal-stress based criteria: tensile-strength criterion and toughness fracture. addition, unlike previous models assume limited hydraulically dryout flux, flux estimated considering quenching thermally by large thermal energy crust. When current was estimate rate it showed 26.5% root-mean-square error (RMSE) data (Lomperski Farmer, 2007), which improved from 39.3% RMSE existing hydraulic-limit 2007). comparing removed energies calculated with without ingression, we found can remove three-times larger when concrete content lower than 5 wt%.