control rod ejection accident

例句：

1. 1.The accident occurred due to a malfunction in the control rods.
   由于控制棒发生故障，发生了这起事故。
2. 2. The investigation into this accident is ongoing.
   对这起事故的调查正在进行中。
3. 3. The safety measures implemented after the accident have been effective.
   事故后实施的安全措施已经有效。