Through preventive process of vibration occurred on medium pressure feed-water pipeline on conventional island in one nuclear power plant

the mutual relationship between the frequency spectrum of vibration and the result of modal calculation has been studied

a preventive scheme of vibration being worked out according to this

and the effectiveness of vibration reduction being evaluated.Combined with the response curve of excited frequency

a vibration-preventing principle for pipelines in power plants has been analysed and sammarized out as in the following:on suitable locations on the pipeline

vibration-preventing device has to be installed

making the natural frequency and oscillation mode at one stage of the pipeline to be eliminated

or making th natural frequency and the oscillation mode to be enhanced to n+1 stage

the main vibration response at one stage of the pipeline will disappear.