Numerical Analysis of Transient Process of HPR1000 Reactor Coolant Pump Shaft Jamming Accident Condition
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摘要: 为揭示核主泵卡轴事故工况管路瞬变机制，通过匹配核主泵和反应堆一回路系统管路阻力特性的关系，建立三环路反应堆冷却剂系统的简化水体模型。基于计算流体动力学（CFD）方法，再现了卡轴事故工况下系统内部的实际瞬态流动过程及其参数实时变化规律，构建了卡轴工况下反应堆冷却剂系统事故安全评估方法，对卡轴事故工况下系统主管路压力、过渡段弯头壁面载荷、三种典型曲率半径传热管压力的瞬态变化情况进行分析。研究表明：在卡轴事故过程中，事故环路中流量在下降至0 m3/h后反向增加，发生倒流现象；事故环路与其他环路的压力和壁面载荷在发生卡轴事故后均会发生剧烈变化后稳定，且事故环路变化程度更大；不同曲率半径传热管压力振荡规律基本一致，且沿各传热管进口至出口方向，监测点的压力峰值逐渐递增。Abstract: In order to reveal the pipeline transient mechanism under the shaft jamming accident condition of the reactor coolant pump (RCP), a simplified fluid domain model of the coolant system of the three-loop reactor was established by matching the relationship between the resistance characteristics of the reactor coolant pump and the pipeline of the primary system. Based on the computational fluid dynamics (CFD) method, the actual transient flow process and the real-time change rule of parameters in the reactor coolant system under shaft jamming accident condition were reproduced, and the accident safety evaluation method of reactor coolant system under shaft jamming accident condition was established. The transient changes of main pipeline pressure, wall load of transition bend and pressure of three typical heat transfer tubes with radius of curvature were analyzed under shaft jamming accident condition. The results show that: in the process of the shaft jamming accident, the flow in the accident loop decreases to 0 m³/h and then increases in reverse, and reverse flow occurs. The pressure and wall load of the accident loop and other loops will change dramatically after the shaft jamming accident, and the change degree of the accident loop is greater. The pressure oscillation law of the heat transfer tubes with different curvature radii is basically the same, and the peak pressure of the monitoring point increases gradually along the direction from the inlet to the outlet of each heat transfer tube.
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图 2 三环路反应堆冷却剂系统简化模型
Figure 2. Simplified Model of the Three-Loop Reactor Coolant System
图 6 系统主管道监测点及壁面示意图
Figure 6. Schematic Diagram of Monitoring Points and Wall of Main Pipeline of the System
图 8 系统内各监测点的压力振荡规律
Figure 8. Pressure Oscillation Law of Each Monitoring Point in System
图 10 蒸汽发生器三种曲率半径传热管相对位置关系
Figure 10. Relative Position Relationship of Heat Transfer Tubes with Three Curvature Radii in Steam Generator
图 11 传热管进出口瞬态压力边界
Figure 11. Transient Pressure Boundary at Inlet and Outlet of Heat Transfer Tube
图 13 传热管re1监测点压力振荡规律
Figure 13. Pressure Oscillation Law at re1 Monitoring Point of Heat Transfer Tube
图 14 传热管re56监测点压力振荡规律
Figure 14. Pressure Oscillation Law at re56 Monitoring Point of Heat Transfer Tube
图 15 传热管re112监测点压力振荡规律
Figure 15. Pressure Oscillation Law at re112 Monitoring Point of Heat Transfer Tube
表 1 核主泵额定参数
Table 1. Rated Parameters of Reactor Coolant Pump
参数名 参数值 额定流量/(m3·h−1) 24680 设计扬程/m 91 额定转速/(r·min−1) 1485 参考压力/MPa 15.5 水力效率/% 79 
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表 2 过渡段第一个弯头处的特殊时间壁面载荷值
Table 2. Wall Load Values at Special Time at the First Elbow of Transition Section
监测壁面 载荷/106 N 正常运行 峰值/谷值 卡轴结束 W1Ⅰ 2.960 3.152 3.031 W2Ⅰ 2.850 3.030 2.912 W3Ⅰ 2.850 3.028 2.912 W4Ⅰ 2.960 3.146 3.029 W1Ⅱ 2.962 2.931 2.959 W2Ⅱ 2.852 2.823 2.850 W3Ⅱ 2.852 2.823 2.850 W4Ⅱ 2.962 2.931 2.959
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表 3 不同曲率半径传热管各监测点瞬态压力波峰值
Table 3. Peak Value of Transient Pressure Wave at Each Monitoring Point of Heat Transfer Tube with Different Radius of Curvature
监测点位置 压力/MPa Re1-3 Re56-3 Re112-2 in1 15.9743 15.9737 15.9510 in2 15.9750 15.9765 15.9581 in3 15.9754 15.9804 15.9643 in4 15.9757 15.9833 15.9700 out1 15.9763 15.9863 15.9750 out2 15.9772 15.9889 15.9793 out3 15.9778 15.9911 15.9830 out4 15.9783 15.9928 15.9860
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