Three basic requirements are therefore presented according to operational principle of gas-operated dual feeder,they are the timeliness,reliability of machnism component,rigidity and intensity under the condition of normal work of automatic mechanism.

The operating principle and common faults of feed mechanism with ring-shaped lever are introduced.

Application of Taguchi method in feed mechanism robust design provides a new method and means for scheme improvement and reliability growth test.

The model of transverse vibration is founded and the qualitative analysis result of the automatic ramming system is obtained.

Learning from the designing methods of other nuclear power projects,a new design for DC power supply system is put forward,which provides a safe and reliable double-circuit power supply for DCS with consideration of the characteristics of the service power system in nuclear power plants.