CFD SIMULATION OF A SCALED MODEL OF THE STORAGE WELL IN SPENT FUEL DRY-STORAGE SYSTEM OF HTR-PM600

Abstract

The spent fuel dry-storage system of the HTR-PM600 in China is consist of six regions, with each composed of multiple wells. The spent fuel canisters are located vertically in the well. To accurately describe the flow resistance characteristics of the storage well, a 1/5 scaled model experiment is under considering. To completely align with flow similarity criterion, the characteristic velocity of the scaled model must be much higher than the full model, Which leads to an unfeasible pressure that a fan can provide. In this paper, the flow characteristic comparison of the full and 1/5 scaled models of the storage well was investigated to identity the characteristic velocity for the following scaled experiment using CFD code and flow self-similar theory. Firstly the flow resistance characteristic of single canister was studied with CFD code, and the canister was simplified to a simple item suitable for resistance calculation. Then a well model that conforms to the real situation was built up to simulate the flow resistance characteristic. With the calculation of different condition, a curve about the relationship of pressure and Reynolds number(Re) can be drawn. The characteristic velocity was chosen as low as possible in an acceptable range of errors to meet the pressure requirements of the fan. The result shows that within a specific interval of Re, the change of flow resistance characteristic is acceptable. The minimum value of the interval will be used in the following experiment.