CFD Analysis Of Decay Heat Conducted Out Of The Spent Fuel Dry Storage Cask

The storage problem of spent fuels is more and more outstanding with the development of nuclear industry. Owing to various advantages such as safety, flexibility of storage capacity, and environmental protection, the demands of spent fuel dry storage are continuously increasing. This paper introduces a Computational Fluid Dynamic model and analyses of a typical cask with FLUENT 15.0. The main work and results are as follows:1. Using ANSYS Workbench software to build geometric model of dry storage cask, and mapped meshing the geometric model. Selection of several groups of different number of grid, test grid independence, and determine the optimal grid number of numerical simulation.2. Using FLUENT 15.0 software, choose SST κ-ω model to complete the numerical simulation of turbulence flow in the dry storage cask. Fuel assemblies have been modeled as a porous medium.3. Complete the numerical simulation of decay heat scattering out of the dry storage cask, and get the temperature distribution nephogram, the velocity distribution nephogram, and the pressure distribution nephogram. The result shows that, the maximum temperature is below the regulation limit.4. The effect of heat load regionalization has been explored by comparing the maximum temperature, the temperature distribution, the velocity distribution and the air outlet temperature. The result shows that, when M=0.5, the decay heat export performance of dry storage cask is better than the other two(M=1, M=3).5. According to the results of numerical simulation, this paper put forward structural scheme optimization from two aspects:change the orientation of inlet and outlet; add fin structure in the outer wall of MPC, or instead the outer wall of MPC with thread wall to strengthen the metal’s capacity of heat transmission.