Piping systems, design dynamic effects

Fixed Spray Array. This is a system of spray tubes containing multiple nozzles connected transversely across the conveyor to a header pipe on one or both sides. The spray nozzles are placed into the tubes in a pattern designed to optimize the effect. Care must be taken to install and orient the nozzles properly for designed effect. Mechanical intervention to selectively activate (or deactivate) portions of the design to effect the fluid dynamics of particular patterns shonld be included. 

The application of LBB technology eliminates the local dynamic effects of postulated pipe breaks from the design basis. There are 4 piping systems in which the application of LBB is accepted. Those systems are the reactor coolant piping, the pressurizer surge line, the shutdown cooling system, and the safety injection system. 

The design specifications for the RCSASs should identify high energy pipes in which sudden ruptures are postulated to occur and systems that must be protected from the dynamic effects of such ruptures. For more information, see Ref. [6]. 

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