CAP1400双乏燃料贮存格架地震条件下流固耦合试验研究

CAP1400是中国自主研发的新型反应堆，其乏燃料贮存格架自由地放置在乏燃料水池内，水可在格架内部通道中流通，同时水也存在于格架与格架、格架与池壁之间的间隙中。在地震情况下，格架与流体之间的流固耦合特性非线性度非常高，很难用软件准确地模拟计算。为准确地探究CAP1400乏燃料贮存格架的流固耦合特性，建立了乏燃料贮存格架和水箱缩比试验模型，开展了振动台试验。在扫频试验中，测量了格架支脚与水箱底板间的摩擦系数；同时研究了正弦波、地震波工况下，格架与格架间的间隙对格架滑移现象、流体压力的影响。通过分析试验结果，得到了格架支脚与水池间的摩擦系数；且格架间隙越大，流体压力越小，但格架间隙对滑移现象影响不明显。本试验的结果可为CAP1400乏燃料贮存格架的流固耦合参数选取提供依据。

Experimental Study on Fluid-structure Interaction under Earthquake Condition of CAP1400 Double Spent Fuel Storage Rack

CAP1400 is a new type of reactor developed independently in China, and the spent fuel storage racks stand freely in the spent fuel pool of CAP1400 reactor. Water can flow through the channels between the storage cells, while water is also found in the gap between the rack and rack, the rack and wall. In the case of earthquakes, due to the non-linearity of the fluid-structure interaction between the rack and water, it is difficult to calculate accurately with the software. In order to accurately investigate the characteristics of fluid-structure interaction, the experiment model of the spent fuel storage racks and the tank was established. The friction coefficient between the racks and the tank was measured by sweeping frequency test. At the same time, the influence of the gap size between the rack and rack on the sliding phenomenon and the fluid pressure was studied. The friction coefficient between the rack and the tank was obtained by analyzing the test results. Moreover, the larger the gap between the rack and rack is, the smaller the fluid pressure is, but the gap size has no obvious effect on the sliding phenomenon. The results can provide reference for design of CAP1400 spent fuel storage rack.