Simplified Modelling Method for Spacer Grid of NHR200-II Fuel Assembly
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摘要: 提出了一种基于NHR200-II供热堆燃料组件定位格架的简化模型。简化建模方法包括2方面：将定位格架上的内刚凸及三弯弹簧用非线性连接器代替；使用梁单元代替实际燃料棒。结合前期关于NHR200-II定位格架的研究成果，确定了非线性连接器的刚度，并通过有限元软件建立了燃料组件简化前后的1×2局部子模型，分析了其固有频率与碰撞特性，证明了简化建模方法的有效性。随后，该简化方法被应用于全尺寸的9×9定位格架模型，研究了格架夹持能力对动力学特性的影响，结果表明，该简化方法可以有效地模拟不同夹紧程度下格架的地震谱响应。综上，从有限元建模角度来看，本文提出的基于NHR200-II燃料组件定位格架的方法是有效的。Abstract: A simplified modelling method for the spacer grid of NHR200-II fuel assembly is proposed to increase the computational efficiency in the dynamic analysis. It includes the replacement of the grid inside the dimples and three-arc springs with the non-linear connectors, and the replacement of the fuel rods with beam elements. The stiffness of connectors was derived from previous experiments of NHR200-II spacer grid. Natural frequency analysis and impact simulation were performed by a 1×2 sub-model of the fuel assembly to verify this method. Then, this simplified method was applied to a full-scale 9×9 spacer grid model, to study the effects of the grid clamping ability on its dynamic characteristics. The results suggest that this simplified approach can give a reasonable response when induced by a seismic load at different clamping levels. In conclusion, from the modelling point of view, the proposed simplified method for NHR200-II spacer grid is effective.
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Key words:
- Nuclear heating reactor /
- Fuel assembly /
- Spacer grid /
- Simplified method /
- Dynamic analysis
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图 1 NHR200-II燃料组件及其定位格架结构示意图
Figure 1. Schematic Diagram of Fuel Assembly and Spacer Grid of NHR200-II
图 9 锆盒与中格架接触处最大应力对比
Figure 9. Comparison of Maximum Mises Stress of Channel at Contact Area between Mid-Grid and Channel
图 10 锆盒与上格架接触处最大应力对比
Figure 10. Comparison of Maximum Mises Stress of Channel at Contact Area between Top-Grid and Channel
图 14 格架外刚凸碰撞合力
Figure 14. Resultant Contact Force between Channel and Grid Outer Dimple
表 1 连接器属性
Table 1. Connector Properties
编号 夹紧程
度/%弹簧刚
度/%预紧力/
N摩擦力刚度/
(N·mm−1)寿期状态 C99-C1 100 100 12 1120 寿期初 C99-C2 50 100 6 560 寿期中 C99-C3 0 100 0 0 寿期末 
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