屏蔽电机主泵双金属飞轮飞射物对承压边界完整性破坏作用

目的掌握反应堆冷却剂泵双金属飞轮飞射物对承压边界完整性的影响规律。方法基于ANSYS/LS-DYNA对飞轮保持环失效后钨合金块与承压边界的碰撞过程进行分析,模拟承压边界在重要因素(电机壳厚度、钨合金块数)的影响下对飞轮飞射物的包容过程。结果在保持飞射物入射初速度不变的情况下,当电机壳厚度小于118 mm时,发生非包容性失效。改变钨合金块数(4、8、12、16块),可以发现钨合金块数越多,飞射物对承压边界施加的破坏能量就越小。结论增加电机壳厚度、钨合金块数有利于承压边界能够很好地包容住所有飞射物。该研究成果对屏蔽电机主泵惰转飞轮的可靠性设计具有重要意义。

Destructive Effect on Integrity of Pressure-retaining Boundary Imposed by Bimetal Flywheel Missiles in the Canned Motor Pump

Objective To grasp the influencing rule of the destructive effect on integrity of pressure-retaining boundary im-posed by bimetal flywheel missiles in the reactor coolant pump. Method This paper analyzed the impact between tungsten alloy block and pressure-retaining boundary (motor casing) after the failure of the flywheel retaining ring by ANSYS/LS-DYNA, and simulated the process that the boundary contains the flywheel missiles under different conditions (the thickness of motor casing, the number of tungsten alloy blocks). Results The uncontained accidents occur when the thickness of the motor casing was less than 118 mm, with incident velocity being constant. The more number of tungsten alloy blocks, the less destructive energy that the missile put on the boundary could be observed by changing the number of tungsten alloy blocks (4,8,12,16). Conclusion In-creasing the thickness of motor casing and number of tungsten alloy blocks could help the pressure-retaining boundary contain the missiles successfully. The results of this research are of great significance to the reliability design of the canned motor pump inert flywheel.