PRESSURIZERSDOE-HDBK-1018/2-93Miscellaneous Mechanical ComponentsPressurizer operation, including spray and heater operation, is usually automatically controlled.Monitoring is required in the event the control features fail, because the effect on the systemcould be disastrous without operator action.SummaryThe important information in this chapter is summarized below.Pressurizer SummaryTwo types of pressurizers -- static and dynamicPurposes of a pressurizer:Maintains system pressure above saturationProvides a surge volume for system expansion and contractionProvides a means of controlling system pressureProvides a means of removing dissolved gases A spray nozzle is a device located in the top of the pressurizer, used to atomizeincoming water to increase the effects of spraying water into the top of thepressurizer to reduce pressure by condensing steam.Insurge is the volume absorbed within the pressurizer during a level increase tocompensate for a rise in the system's temperature.Outsurge is the volume released from the pressurizer during a level decrease tocompensate for a reduction in the system's temperature.The surge volume is the volume of water that accommodates the expansion andcontraction of the system, and is designed to be typical of normal pressurizerperformance. ME-05Rev. 0Page 34
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