ML17261B059: Difference between revisions

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==DearMr.Johnson:==
==DearMr.Johnson:==
IntheNRC'sSafetyEvaluationReportforSEPTopicV-11.B,"RHRInterlockRequirements",datedSeptember29,1981,itwasdeterminedthatthelackofinterlocksonRHRMOVs701andMOVs720wasacceptable.Severalreasonswerestatedforthis,asfollows:~TheRHRvalvesaredesignedsuchthattheyarephysicallyunabletoopenagainstadifferentialpressuregreaterthan500psi~Byadministrativeprocedure,theRHRvalvesarekey-lockedclosed,withpowerremoved~Areliefvalve,setat600psig,isavailableintheRHRsystem.InthecourseofRG&E'simplementationofourMOVtestingprogram,usingtheguidanceofGenericLetter89-10,ithasbeendetermined,thatMOVs701and720willopenagainstadifferentialpressureofgreaterthan500psi.Nonetheless,RGGEconsidersthat,withthepresentarrangement,nointerlocksarerequiredforthesevalves.InorderforapotentialoverpressurizationoftheRHRsystemtooccur,thefollowingsetoffailureswouldhavetooccur:(Note:a.schematicoftheRHRsystemisshownonUFSARFigure5.4-7.)1.Powerwould.havetobedeliberatelyrestoredatthebreaker,inviolationofprocedureA-52.2Theinterlockedin-boardvalves(MOV700orMOV721)wouldhavetofailtoallowsignificantleakage.Thisisconsideredoflowprobability,sincethesevalvesareintheGinnaPumpandValveInserviceTestingProgram,andareleak-testedonanannualbasisusinrocedurePT-8.3.gpPDRADOCK00000244P~gg/~g~P~PggPb.g2S'8''CO2.Thekey-lockedswitchwouldhavetobeenabled,andthevalveopened,inviolationofnormalalignmentprocedures J4.~~ReliefvalveRV-203,withacapacityof70,000lb/hr,wouldhavetofail.Thisreliefvalvehasbeentestedannually(RSSP-12)forseatleakageandsetpointverification.Thus,itisconsideredthatthecapabilityofMOVs701and720toopenagainstadifferentialpressureofgreaterthan500psi,withouttheavailabilityofinterlocksonthesevalves,remainsacceptable,anddoesnothaveasignificantimplicationforpublichealthandsafety.ThisinformationwillbereflectedinthenextrevisionoftheGinnaStationUFSAR.Verytrulyyours,RobertC.MecredDivisionManagerNuclearProductionGJWN099xc:Mr.AllenR.Johnson(MailStop14D1)ProjectDirectorateI-3Washington,D.C.20555U.S.NuclearRegulatoryCommissionRegionI475AllendaleRoad".KingofPrussia,PA19406GinnaSeniorResidentInspector  
IntheNRC'sSafetyEvaluationReportforSEPTopicV-11.B,"RHRInterlockRequirements",datedSeptember29,1981,itwasdeterminedthatthelackofinterlocksonRHRMOVs701andMOVs720wasacceptable.Severalreasonswerestatedforthis,asfollows:~TheRHRvalvesaredesignedsuchthattheyarephysicallyunabletoopenagainstadifferentialpressuregreaterthan500psi~Byadministrativeprocedure,theRHRvalvesarekey-lockedclosed,withpowerremoved~Areliefvalve,setat600psig,isavailableintheRHRsystem.InthecourseofRG&E'simplementationofourMOVtestingprogram,usingtheguidanceofGenericLetter89-10,ithasbeendetermined,thatMOVs701and720willopenagainstadifferentialpressureofgreaterthan500psi.Nonetheless,RGGEconsidersthat,withthepresentarrangement,nointerlocksarerequiredforthesevalves.InorderforapotentialoverpressurizationoftheRHRsystemtooccur,thefollowingsetoffailureswouldhavetooccur:(Note:a.schematicoftheRHRsystemisshownonUFSARFigure5.4-7.)1.Powerwould.havetobedeliberatelyrestoredatthebreaker,inviolationofprocedureA-52.2Theinterlockedin-boardvalves(MOV700orMOV721)wouldhavetofailtoallowsignificantleakage.Thisisconsideredoflowprobability,sincethesevalvesareintheGinnaPumpandValveInserviceTestingProgram,andareleak-testedonanannualbasisusinrocedurePT-8.3.gpPDRADOCK00000244P~gg/~g~P~PggPb.g2S'8''CO2.Thekey-lockedswitchwouldhavetobeenabled,andthevalveopened,inviolationofnormalalignmentprocedures J4.~~ReliefvalveRV-203,withacapacityof70,000lb/hr,wouldhavetofail.Thisreliefvalvehasbeentestedannually(RSSP-12)forseatleakageandsetpointverification.Thus,itisconsideredthatthecapabilityofMOVs701and720toopenagainstadifferentialpressureofgreaterthan500psi,withouttheavailabilityofinterlocksonthesevalves,remainsacceptable,anddoesnothaveasignificantimplicationforpublichealthandsafety.ThisinformationwillbereflectedinthenextrevisionoftheGinnaStationUFSAR.Verytrulyyours,RobertC.MecredDivisionManagerNuclearProductionGJWN099xc:Mr.AllenR.Johnson(MailStop14D1)ProjectDirectorateI-3Washington,D.C.20555U.S.NuclearRegulatoryCommissionRegionI475AllendaleRoad".KingofPrussia,PA19406GinnaSeniorResidentInspector}}
}}

Revision as of 13:53, 18 May 2018

Advises That No Interlocks Required for RHR motor-operated Valves 701 & 720 Based on Present Arrangement.Listed Failures Would Have to Occur in Order for Potential Overpressurization of RHR Sys to Occur
ML17261B059
Person / Time
Site: Ginna Constellation icon.png
Issue date: 04/17/1990
From: MECREDY R C
ROCHESTER GAS & ELECTRIC CORP.
To: JOHNSON A R
Office of Nuclear Reactor Regulation
References
TASK-05-11.B, TASK-5-11.B, TASK-RR GL-89-10, NUDOCS 9005020083
Download: ML17261B059 (4)


Text

ACCELERATEDDISTjUBUTIONDEMONSHRATIONSYSTEMREGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:9005020083DOC.DATE:90/04/17NOTARIZED:NOFACIL:50-244RobertEmmetGinnaNuclearPlant,Unit1,RochesterGAUTH.NAMEAUTHORAFFILIATIONMECREDY,R.C.RochesterGas6ElectricCorp.RECIP.NAMERECIPIENTAFFILIATIONJOHNSON,A.R.ProjectDirectorateI-3

SUBJECT:

AdvisesthatnointerlocksarerequiredforRHRvalvesMOV7016MOV720atplant,perNRCSERforSEPTopicV-ll.B.DISTRIBUTIONCODE,AEOIDCOPIESRECEIVED,LTR2ENCL0SIZE.TITLE:CorrespondencereSEPTopicsNOTES:LicenseExpdateinaccordancewith10CFR2,2.109(9/19/72).DOCKET05000244S05000244,/RECIPIENTIDCODE/NAMEJOHNSON,AINTERNAL:NUDOCS-ABS~RE~I-LE.--,0~~EXTERNAL:LPDRNSICCOPIESLTTRENCLRECIPIENTIDCODE/NAMEOGC/HDS2NRCPDRCOPIESLTTRENCL'DRDSNOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTElCONTACTTHE,DOCUMENTCONTROLDESK,ROOMPI-37(EXT.20079)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISISFORDOCUMENTSYOUDON'TNEEDIgTOTALNUMBEROFCOPIESREQUIRED:LTTR~ENCL9,8 IIEiI4~(

,zsizzpsvze,>i,~zrurzi/pzrzizu'~YOTklizsiirizizROCHESTERGASANDELECTRICCORPORATIONo89EASTAVENUE,ROCHESTER,NK146490001YORKiYKYRApril17,1990YCLKPHONEKDKKCOOKYYO546.2700U.S.NuclearRegulatoryCommissionDocumentControlDeskAttn:AllenR.JohnsonProjectDirectorateI-3Washington,D.C.20555

Subject:

LackofInterlocksonRHRValvesMOV701and.MOV720R.E.GinnaNuclearPowerPlantDocketNo.50-244

DearMr.Johnson:

IntheNRC'sSafetyEvaluationReportforSEPTopicV-11.B,"RHRInterlockRequirements",datedSeptember29,1981,itwasdeterminedthatthelackofinterlocksonRHRMOVs701andMOVs720wasacceptable.Severalreasonswerestatedforthis,asfollows:~TheRHRvalvesaredesignedsuchthattheyarephysicallyunabletoopenagainstadifferentialpressuregreaterthan500psi~Byadministrativeprocedure,theRHRvalvesarekey-lockedclosed,withpowerremoved~Areliefvalve,setat600psig,isavailableintheRHRsystem.InthecourseofRG&E'simplementationofourMOVtestingprogram,usingtheguidanceofGenericLetter89-10,ithasbeendetermined,thatMOVs701and720willopenagainstadifferentialpressureofgreaterthan500psi.Nonetheless,RGGEconsidersthat,withthepresentarrangement,nointerlocksarerequiredforthesevalves.InorderforapotentialoverpressurizationoftheRHRsystemtooccur,thefollowingsetoffailureswouldhavetooccur:(Note:a.schematicoftheRHRsystemisshownonUFSARFigure5.4-7.)1.Powerwould.havetobedeliberatelyrestoredatthebreaker,inviolationofprocedureA-52.2Theinterlockedin-boardvalves(MOV700orMOV721)wouldhavetofailtoallowsignificantleakage.Thisisconsideredoflowprobability,sincethesevalvesareintheGinnaPumpandValveInserviceTestingProgram,andareleak-testedonanannualbasisusinrocedurePT-8.3.gpPDRADOCK00000244P~gg/~g~P~PggPb.g2S'8CO2.Thekey-lockedswitchwouldhavetobeenabled,andthevalveopened,inviolationofnormalalignmentprocedures J4.~~ReliefvalveRV-203,withacapacityof70,000lb/hr,wouldhavetofail.Thisreliefvalvehasbeentestedannually(RSSP-12)forseatleakageandsetpointverification.Thus,itisconsideredthatthecapabilityofMOVs701and720toopenagainstadifferentialpressureofgreaterthan500psi,withouttheavailabilityofinterlocksonthesevalves,remainsacceptable,anddoesnothaveasignificantimplicationforpublichealthandsafety.ThisinformationwillbereflectedinthenextrevisionoftheGinnaStationUFSAR.Verytrulyyours,RobertC.MecredDivisionManagerNuclearProductionGJWN099xc:Mr.AllenR.Johnson(MailStop14D1)ProjectDirectorateI-3Washington,D.C.20555U.S.NuclearRegulatoryCommissionRegionI475AllendaleRoad".KingofPrussia,PA19406GinnaSeniorResidentInspector