Step dynamic process of the hydraulically-driven control rod, (I) Experiment of dynamic process behavior

The step dynamic process of the hydraulic control rod (HCR) has been achiev ed by experiments. This paper reveals the action mechanism of the HCR, give s detailed analyses of the relationship among the dynamic feature, the cont rol rod and combined valve performance parameters, and the combined valve o peration. The results indicate that the step process of the control rod is affected by the output flow pulse of the combined valve, pressure wave, and heavily damped pressure oscillation that is produced by the step, cylinder movement. The performance parameters of the step cylinder limit the Row ra nge in its stationary balanced state and also limit the capability of absor bing the flow pulse and pressure wave in its step process. The performance parameters of the combined valve determine the quantitative values of stati onary balance, delay balance, flow pulse and pressure wave. The relation of both parameters determines the step state of the control rod.