Study on Numerical Simulation of Drop Impact of Spent Fuel Transfer Equipment
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摘要: 乏燃料转运设备核电厂内运输跌落分析是整体结构安全分析中最严苛的工况，为了解决设备跌落的动力学冲击分析评价问题，使用有限元分析模拟软件LS-DYNA对乏燃料转运设备进行数值模拟，针对典型乏燃料转运设备的跌落进行建模，并结合实际厂址条件，跌落的接触地面采用Holmquist-Johnson-Cook（HJC）模型，通过模拟计算，获得设备加速度曲线和关键位置形变量，研究结果表明：在结合厂内实际地面条件的情况下，贮存套筒变形量受跌落角度影响很大，在贮存运输过冲中应避免设备竖直姿态的跌落。本文的分析评价方法可以为乏燃料转运设备的自主化设计提供技术支持和理论依据。Abstract: Analysis of drop of spent fuel transfer equipment in nuclear power plant is the most stringent condition in overall structural safety analysis. In order to solve the problem of dynamic impact analysis and evaluation of equipment drop, the finite element analysis and simulation software LS-DYNA is used to numerically simulate the spent fuel transfer equipment, and model the drop of typical spent fuel transfer equipment. Combined with the actual plant site conditions, the drop contact ground adopts Holmquist-Johnson-Cook (HJC) model. Through simulation calculation, the acceleration curve of equipment and the deformation variables of key position are obtained. The results show that the deformation of the storage sleeve is greatly affected by the drop angle when combined with the actual ground conditions in the plant. The vertical drop of the equipment shall be avoided in the overshoot of storage and transportation. The analysis and evaluation method in this paper can provide technical support and theoretical basis for the autonomous design of spent fuel transfer equipment.
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Key words:
- LS-DYNA /
- Drop impact /
- Dynamics /
- Nonlinear
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图 2 转运设备跌落分析有限元模型
Figure 2. Finite Element Model for Drop Analysis of Transfer Equipment
图 3 3种跌落姿态下加速度随时间变化曲线
Figure 3. Acceleration Versus Time Curves under Three Drop Postures
图 4 3种跌落姿态下的贮存套筒内间距随时间变化图
Figure 4. Time Varying Diagram of Storage Sleeve Inner Distance under Three Drop Postures
表 1 混凝土和花岗岩HJC模型材料参数
Table 1. Material Parameters of Concrete and Granite HJC Model
参数 混凝土 花岗岩 极限面参数 A 0.79 0.3 B 1.60 2.5 N 0.61 0.79 Smax 7.0 15 压力参数 Pc/MPa 16 51 Uc 0.001 0.00162 K1/GPa 85 12 K2/GPa 171 25 K3/GPa 208G 42 Pl/GPa 0.8 1.2 Ul 0.10 0.012 基本力学参数 ρ/(kg·m−3) 2440 2660 Fc/MPa 48 154 G/MPa 14.86 28.7 T/MPa 40 12.2 A、B、N均为材料极限面参数，A—特征化黏性强度系数，B—特征化压力硬化系数，N—压力硬化指数；Smax—材料所能达到的最大特征化等效应力；K1、K2、K3—压力参数；Pc、Uc—弹性极限时的静水压力值与对应的应变；Pl、Ul—压实极限时的静水压力值与对应的应变；ρ—材料密度；G—材料剪切模量；Fc—材料准静态单轴压缩强度；T—材料拉伸强度 
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