Analysis on the Improved Control Rod Drop Behavior among Deformation Channels Based on the Rigid-flexible Coupling
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摘要: 燃料组件在堆芯内经历长期辐照后易产生弯曲形变，影响控制棒的安全落棒，因此亟需研究变形通道下控制棒落棒行为影响机制。通过数值模拟手段对导向管发生弯曲变形后的落棒行为规律进行分析研究，利用刚柔耦合方法分别计算直型、C型、S型导向管内的落棒行为，分析整个落棒行程、速度、加速度、沿程碰撞力随时间的变化情况，对比直型和2种不同变形通道对落棒行为的影响。研究结果表明，刚柔耦合方法可以较好地模拟变形通道下的落棒行为，C型落棒未发生卡滞，S型落棒卡滞于第2道弯折处。本研究将有助于为弯曲变形导致落棒卡涩问题的极限弯曲阈值提供判断依据，为工程设计提供参考。Abstract: The fuel assembly is prone to bend after long-term irradiation in the core, which affects the safe drop of the control rod. Therefore, it is urgent to study the influence mechanism of the control rod drop behavior under the deformation channel. By means of numerical simulation, the law of rod drop behavior after bending deformation of guide tube is analyzed and studied, the rigid-flexible coupling method is used to calculate the rod drop behaviors in the straight, C-shaped and S-shaped guide tubes respectively, analyze the variation of the entire rod drop journey, velocity, acceleration, and collision force along the journey with time, and the effects of straight and two different deformation channels on rod drop behavior are compared. The results show that the rigid flexible coupling method can better simulate the rod drop behavior under the deformation channel. The C-shaped rod drop does not get stuck, and the S-shaped rod drop is stuck at the second bend. This study will help to provide a basis for judging the ultimate bending threshold of the problem of rod drop sticking caused by bending deformation, and provide a reference for engineering design.
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Key words:
- Control rod drop /
- Deformation channel /
- Rigid-flexible coupling /
- Rod stick /
- Numerical simulation
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图 1 流体阻力与落棒速度的拟合关系
Figure 1. Fitting Relationship between the Hydraulic Friction and Rod-dropping Velocity
图 3 燃料组件弯曲变形示意图 单位：mm
Figure 3. Schematic Diagram of Bending Deformation of Fuel Assembly
图 4 刚柔耦合多体动力学计算流程
Figure 4. Calculation Process of Rigid-flexible Coupled Multi-body Dynamics
图 5 不同变形通道下的落棒行程-时间曲线
Figure 5. Rod Drop Journey-Time Curve under Different Deformation Channels
图 6 不同变形通道下的落棒速度-时间曲线
Figure 6. Rod Drop Speed-Time Curves under Different Deformation Channels
图 7 控制棒组件高度与落棒速度的对应关系
Figure 7. Corresponding Relationship between Control Rod Assembly Height and Rod Dropping Speed
图 8 不同弯曲通道下的落棒加速度-时间曲线
Figure 8. Rod Dropping Acceleration-Time Curves under Different Bend Channels
图 9 不同变形通道下落棒沿程碰撞力-时间曲线
Figure 9. Along-the-way Collision Force-Time Curve of Rod Dropping under Different Deformation Channels
表 1 控制棒组件及其导向通道结构参数
Table 1. Structural Parameters of Control Rod Assembly and its Guide Channel
设计参数 参数值 控制棒外径/mm 17 导向管外径/mm 20 导向管内径/mm 19 导向管缩颈段内径/mm 18 导向管下端流水孔直径/mm 3 导向管缩径段长度/mm 850 导向管总长度/mm 4290 导向管中心距/mm 20.5 控制棒组件改进型落棒通道尺寸
（长×宽×厚）/mm×mm×mm185×185×21 控制棒落棒行程/mm 4100 控制棒驱动线质量/kg 90 
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表 2 连接柄-燃料组件（刚-刚）碰撞力设置
Table 2. Setup of the Contact Force between Joint and Fuel Assembly (Rigid-to-Rigid)
刚度/(N·mm−1) 力指数 阻尼/( N·s·mm−1) 穿透深度/mm 1×108 2.2 1×104 1×10−6
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表 3 通道-控制棒（刚-柔）碰撞力及摩擦力设置
Table 3. Setup of the Contact Force and Friction between Channel and Control Rods (Rigid-to-Flexible)
刚度/(N·mm−1) 力指数 阻尼/( N·s·mm−1) 穿透深度/mm 1×108 2.2 1×104 1×10−4 静摩擦系数 动摩擦系数 静滞速度/(m·s−1) 滑动速度/(m·s−1) 0.3 0.1 0.1 1.0
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