ML18030A533

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Wetwell Spray Termination of Pressure Increase Results
ML18030A533
Person / Time
Site: Susquehanna  Talen Energy icon.png
Issue date: 04/16/1981
From:
PENNSYLVANIA POWER & LIGHT CO.
To:
Shared Package
ML18026A343 List:
References
NUDOCS 8104210472
Download: ML18030A533 (2)


Text

Attachment 3toPLA-742Page1of1WETWELLSPRAYTER'4INATION OF'PRESSURE INCREASETheNRCinAppendixItoSRP6.2.1.1.C givesguidancethatspraycapacitybesufficient toaccommodate aleakageareaoftheorderofA/~K=0.05ftTherefore, acalculation wasperformed toconfirmthatwiththedrywellatthedesignpressureandaleakageareaofA//K=0.05ftthedrywellandwetwellpressureincreasewouldbeterminated whenthewetwellspraysareinitiated.

Theleakagerateis=0.052X32.2X144X5.186.406m=4.3ibm/secThewetwellsprayflowrateofonespraysystemis(reference "RHRProcessDiagram".

GEdrawing76IE792ARev5)750gpmX1=103ibm/sec7.48X60X.016247Thecondensation efficiency iscalculated aseff=condXevapmhh-hm(fsprayXspray)Thisequationisusedtocalculate theminimumacceptable sprayefficiency bysubstituting thebypassleakagerateof4.3ibm/secintotheequationforcond.'hewetwellsprayswillterminate thepressureincreaseaslongastheycondensemoresteamthanisleakingtothewetwell.Therequiredsprayefficiency foroneRHRspraysystemasafunctionofspraytemperature isgivenbelow.Withtwospraysystemsoperating therequiredefficiency wouldbehalved.Theactualsprayefficiency shouldbeontheorderof0.7and,hence,whenasinglesystemisinoperation withitsRHRheatexchanger, thistermination ofthepressureincreaseisassured.SraTemerature130F150F170F190FRequiredEfficiency ofOneMetwellSraSstem.23.26.50.36