Reactor water cleanup RWCU return sparger

Reactor water cleanup (RWCU) return sparger 

In BWR/1 plants, the cleanup return sparger distributes the water from the RWCU system in the vessel. The sparger is connected to the RPV nozzle, to which the RWCU system return line joins. Water from the system enters below the steam separator and mixes with reactor recirculating water. The sparger is fabricated from stainless steel pipe and has holes in the front. 

Each housing transmits loads to the bottom head. These loads include the weights of a control rod, a control rod drive, a control guide tube, an orificed fuel support, and the four fuel assemblies that rest on the fuel support. The lower portion of CRD housings are primary pressure boundaries. 

Note that the stub tube is categorized as the reactor pressure vessel and is not within the scope of this report. 

The feedwater is distributed and mixed with the recirculating saturated water discharged from the steam separators and dryers to provide subcooling at the inlet to the jet pump or internal/ external pump to prevent cavitation and to have a uniform temperature mixture entering the reactor core to prevent an asymmetrical core power distribution. 

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Reactor Water Cleanup (RWCU) Return Sparger 6. CRD Guide Tube... 

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