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This paper illustrates the work principle of the hydraulic control rod driving system (HCRDS) and the operation of step-up process. As well as the dynamic characteristic of step-up process with the study of experimental results, it also analyzes the influencing parameters of the step-up process, such as holding-flow rate, lift delay time and pressure in front of combined valve, etc. The initial theoretical model of step-up process of HCRDS has been established on the basis of rational analysis, simplification and hypothesis. The calculation result of the theoretical model approximately coincides with the experimental result, which lays a solid foundation for the auxiliary mechanism analysis of HCRDS.

Theoretical analysis and experimental study on the steady state property of the hydraulic control rod drive mechanism for the 200 MW nuclear heating reactor have been carried out in depth. The minimum and maximum holding flow in steady state and their changes along with temperature were identified, and the relationship between the steady state property and the design data of the control rod drive mechanism was analyzed too. A fine agreement between the analysis results and measured data has been achieved.