NOVEL APPROACHES TO MODELING HEAT TRANSFER IN A LATE STAGE OF A SEVERE CORE-MELTDOWN ACCIDENT AT A WATER-MODERATED WATER-COOLED POWER REACTOR

The authors have described the key features of approaches to numerical modeling of the interaction of the core melt of a water-moderated water-cooled power reactor with the NPP structures, that are aimed at accelerating the calculation to preserve the approximation by using 0D + 2D fi nite-element schemes with an adaptive 2D grid for the wall and a 0D grid for the melt. The composition of the melt of interacting components and their properties, and also the properties of the heating material of the wall are determined in the process of calculation. The given examples of calculations of the thermal erosion of the wall by the melt with in-vessel retention of the melt and melt–concrete interaction illustrate the computational effi ciency of the proposed approaches.
The authors have described the key features of approaches to numerical modeling of the interaction of the core melt of a water-moderated water-cooled power reactor with the NPP structures, that are aimed at accelerating the calculation to preserve the approximation by using 0D + 2D fi nite-element schemes with an adaptive 2D grid for the wall and a 0D grid for the melt. The composition of the melt of interacting components and their properties, and also the properties of the heating material of the wall are determined in the process of calculation. The given examples of calculations of the thermal erosion of the wall by the melt with in-vessel retention of the melt and melt–concrete interaction illustrate the computational effi ciency of the proposed approaches.
Author:  A. S. Filippov, V. D. Ozrin
Keywords:  light-water reactor, severe accident, heat transfer, in-vessel retention of the melt, fi nite-element method, adaptive grid
Page:  1830