ML17249A779: Difference between revisions

From kanterella
Jump to navigation Jump to search
(Created page by program invented by StriderTol)
(Created page by program invented by StriderTol)
Line 29: Line 29:
ThisletterisinresponsetoyourFebruaryll,1980letter,whichrequestedthefollowingadditionalinformationconcerningtheGinnacontainmentpurgeandventsystems.1.Theoverridingofonetypeofsafetyactuationsignalshouldnotcausetheblockingofanyothertypeofsafetyactuationsignaltotheisolationvalves.TheGinnaplantengineeredsafetyfeaturesapparentlyhaveseveraloverridesthatblockevenmanualactuation.Response:Asstatedinourlettertoyouonthesubjectsystem,datedDecember14,1979,thecontainmentpurgesystemhasbeendesignedtoprovidepurgingcapabilityfollowingaLOCA,whenhighcontainmentradiationandSIsignalsmaybepresent,tolimitpotentialhydrogenconcentrationsincontainmentduringthepostaccidentperiod.Inordertoperformthissafetyfunction,theresetsystemisdesignedtooverrideallcontainmentisolationinitiatingsignalsaslongasanyactuatingsignalispresent.TheexistingresetwithSection2.1.4requireindividualvalvewhichmaybesignalispresent.actions,includingsystemisbeingmodifiedinaccordanceandAppendixA2.1.4ofNUREG0578,toresettingofanycontainmentisolationrequiredtoopenwhileaC.I.initiatingAtleastthreedeliberateoperatoroperationofthecontainmentisolation80032408'I JlROCHESTERGASANDELECTRICCP.DATEMarch17,1980ToMr.DennisL.Ziemann,-ChiefSHEETNO.keyswitch,mustbeperformedbytheoperatorbeforeanytworedundantisolationvalves(potentialreleasepath)areopened(e.g.,purgeexhaust).Thisvirtuallyprecludesinadvertentviolationofcontainment,isolation.Proceduresrequireextensivereviewofplantconditionsbeforeinitiatinganyactionwhichwouldrequiretheopeningofanisolationvalveafteraneventwhichhascausedcontainmentisolation.Ifitweredecidedtoperformacontainmentpurgeduringaccidentconditions,greatcarewouldbetakenduringthisoperation.Thepersonnelperformingthissafetyfunctionwouldbeawareofthesignificanceoftheaction,andwouldbepreparedtoclosethevalvesifnecessaryforanyreason.Re-establishingcontainmentisolationwouldbeaquick,simpleprocess(closingtheappropriatevalveswitches).Itisnotconsideredthat.thisprocessrequiresanyfurthersimplification(suchashavingasystem-levelmanualisolationswitch).AnothersetofcircumstanceswhereinthecontainmentventilationisolationvalvesareblockedfromclosinguponreceiptofasafetyactuationsignalisdescribedinourDecember14,1979letteronthissubject.Intheeventthesevalvesareopen,andhighactivity(butnoSIsignal)ispresent,administrativeproceduresensurethattheresetwillnotbeuseduntilthehighactivityalarmhasbeencleared.TheSIsignalwillthusnolongerbeblocked,andbecapableofeffectingvalveclosure.2.Thesystemlevelannunciationoftheoverriddenstatusshouldbeprovidedforeverysafetysystemimpactedwhenanoverrideisactive.TheGinnaplantapparentlydoesnothavethiscapability.Response:Asnotedinourresponsetoitem(1)above,theresetpanelmatrixclearlydisplaysanyisolationvalvewhichisinaresetstatus.TherequirementreferredtoforsystemlevelannunciationofoverriddenstatusofsafetysystemsiscontainedinRegulatoryGuide1.47,BassedandInoerableStatusIndicationforNuclearPowerPlantSafetSstemswhichwasz.ssuedznMay1973.Theextenttowhichplants,suchasR.E.Ginna,whichweredesignedandconstructedpriortotheissuanceofthisRegulatoryGuide,arerequiredtoimplementitsrequirementsiscurrentlythesubjectofgenericreviewundertheSEPprogramandTMIrelatedNRCstaffprograms.Itisourpositionthatstatusmonitoringmodificationsshouldonlybemadeonanintegratedbasisforallsafetysystemsinaccordance'withcarefulconsiderationoftheman-machineinterface.  
ThisletterisinresponsetoyourFebruaryll,1980letter,whichrequestedthefollowingadditionalinformationconcerningtheGinnacontainmentpurgeandventsystems.1.Theoverridingofonetypeofsafetyactuationsignalshouldnotcausetheblockingofanyothertypeofsafetyactuationsignaltotheisolationvalves.TheGinnaplantengineeredsafetyfeaturesapparentlyhaveseveraloverridesthatblockevenmanualactuation.Response:Asstatedinourlettertoyouonthesubjectsystem,datedDecember14,1979,thecontainmentpurgesystemhasbeendesignedtoprovidepurgingcapabilityfollowingaLOCA,whenhighcontainmentradiationandSIsignalsmaybepresent,tolimitpotentialhydrogenconcentrationsincontainmentduringthepostaccidentperiod.Inordertoperformthissafetyfunction,theresetsystemisdesignedtooverrideallcontainmentisolationinitiatingsignalsaslongasanyactuatingsignalispresent.TheexistingresetwithSection2.1.4requireindividualvalvewhichmaybesignalispresent.actions,includingsystemisbeingmodifiedinaccordanceandAppendixA2.1.4ofNUREG0578,toresettingofanycontainmentisolationrequiredtoopenwhileaC.I.initiatingAtleastthreedeliberateoperatoroperationofthecontainmentisolation80032408'I JlROCHESTERGASANDELECTRICCP.DATEMarch17,1980ToMr.DennisL.Ziemann,-ChiefSHEETNO.keyswitch,mustbeperformedbytheoperatorbeforeanytworedundantisolationvalves(potentialreleasepath)areopened(e.g.,purgeexhaust).Thisvirtuallyprecludesinadvertentviolationofcontainment,isolation.Proceduresrequireextensivereviewofplantconditionsbeforeinitiatinganyactionwhichwouldrequiretheopeningofanisolationvalveafteraneventwhichhascausedcontainmentisolation.Ifitweredecidedtoperformacontainmentpurgeduringaccidentconditions,greatcarewouldbetakenduringthisoperation.Thepersonnelperformingthissafetyfunctionwouldbeawareofthesignificanceoftheaction,andwouldbepreparedtoclosethevalvesifnecessaryforanyreason.Re-establishingcontainmentisolationwouldbeaquick,simpleprocess(closingtheappropriatevalveswitches).Itisnotconsideredthat.thisprocessrequiresanyfurthersimplification(suchashavingasystem-levelmanualisolationswitch).AnothersetofcircumstanceswhereinthecontainmentventilationisolationvalvesareblockedfromclosinguponreceiptofasafetyactuationsignalisdescribedinourDecember14,1979letteronthissubject.Intheeventthesevalvesareopen,andhighactivity(butnoSIsignal)ispresent,administrativeproceduresensurethattheresetwillnotbeuseduntilthehighactivityalarmhasbeencleared.TheSIsignalwillthusnolongerbeblocked,andbecapableofeffectingvalveclosure.2.Thesystemlevelannunciationoftheoverriddenstatusshouldbeprovidedforeverysafetysystemimpactedwhenanoverrideisactive.TheGinnaplantapparentlydoesnothavethiscapability.Response:Asnotedinourresponsetoitem(1)above,theresetpanelmatrixclearlydisplaysanyisolationvalvewhichisinaresetstatus.TherequirementreferredtoforsystemlevelannunciationofoverriddenstatusofsafetysystemsiscontainedinRegulatoryGuide1.47,BassedandInoerableStatusIndicationforNuclearPowerPlantSafetSstemswhichwasz.ssuedznMay1973.Theextenttowhichplants,suchasR.E.Ginna,whichweredesignedandconstructedpriortotheissuanceofthisRegulatoryGuide,arerequiredtoimplementitsrequirementsiscurrentlythesubjectofgenericreviewundertheSEPprogramandTMIrelatedNRCstaffprograms.Itisourpositionthatstatusmonitoringmodificationsshouldonlybemadeonanintegratedbasisforallsafetysystemsinaccordance'withcarefulconsiderationoftheman-machineinterface.  


T,ROCHESTERGASANDELECTRICCP.DATEMarch17,1980ToMr.DennisL.Ziemann,ChiefSHEETNO.Treatingindividualsystems,suchascontainmentisolation,withoutregardtomaintainingaconsistent=statusmonitoringapproachtoallsafetysystemscouldleadtooperatorconfusionanderror.3.Theinstrumentationandcontrolsystemsprovidedtoinitiateengineeredsafetyfeaturesshouldbedesignedandqualifiedassafetygradeequipment.Discussthequalificationoftheisolationchannelandradiationchannelequipment.inthisregard.Response:Thecontainmentisolationsystem,includingtheactuatingchannels,wasdesignedandconstructedasaClassIEsystem.QualificationofelectricalandISCequipmenthasbeendescribedinourreporttoA.Schwencer,datedFebruary24,1978,onthesubject."EnvironmentalQualificationofElectricalEquipment,R.E.GinnaNuclearPowerPlantUnitNo.1".ThistopiciscurrentlybeingreviewedgenericallyundertheSEPprogram.4.TheoverridingorresettingoftheisolationactuationsignalshouldnotcausetheautomaticmotionofanyEngineeredSafetyFeaturevalve.YourletterofOctober17,1979andNovember19,1979indicatethatamodificationisplannedfortheupcomingMarchrefuelingoutage.Describehowthemodificationwillpreventautomaticvalvepositionchangesonresettingofisolationlogic,includingschematicdiagramsorsketchesasnecessary.Response:ThedetaileddesignofthecontainmentisolationmodificationwhichrequiresindividualresetforeachisolationvalveisbeingreviewedaspartoftheShort-TermLessonsLearnedProgram.Verytrulyyours,L.D.Whie,Jr.LDW:np  
T,ROCHESTERGASANDELECTRICCP.DATEMarch17,1980ToMr.DennisL.Ziemann,ChiefSHEETNO.Treatingindividualsystems,suchascontainmentisolation,withoutregardtomaintainingaconsistent=statusmonitoringapproachtoallsafetysystemscouldleadtooperatorconfusionanderror.3.Theinstrumentationandcontrolsystemsprovidedtoinitiateengineeredsafetyfeaturesshouldbedesignedandqualifiedassafetygradeequipment.Discussthequalificationoftheisolationchannelandradiationchannelequipment.inthisregard.Response:Thecontainmentisolationsystem,includingtheactuatingchannels,wasdesignedandconstructedasaClassIEsystem.QualificationofelectricalandISCequipmenthasbeendescribedinourreporttoA.Schwencer,datedFebruary24,1978,onthesubject."EnvironmentalQualificationofElectricalEquipment,R.E.GinnaNuclearPowerPlantUnitNo.1".ThistopiciscurrentlybeingreviewedgenericallyundertheSEPprogram.4.TheoverridingorresettingoftheisolationactuationsignalshouldnotcausetheautomaticmotionofanyEngineeredSafetyFeaturevalve.YourletterofOctober17,1979andNovember19,1979indicatethatamodificationisplannedfortheupcomingMarchrefuelingoutage.Describehowthemodificationwillpreventautomaticvalvepositionchangesonresettingofisolationlogic,includingschematicdiagramsorsketchesasnecessary.Response:ThedetaileddesignofthecontainmentisolationmodificationwhichrequiresindividualresetforeachisolationvalveisbeingreviewedaspartoftheShort-TermLessonsLearnedProgram.Verytrulyyours,L.D.Whie,Jr.LDW:np}}
}}

Revision as of 14:25, 18 May 2018

Responds to NRC 800211 Ltr Re Addl Info on Containment Purge & Vent Sys.Existing Sys Being Modified Per NUREG-0578 to Require Individual Resetting of Any Containment Isolation Valve Required to Open When Initiating Signal Present
ML17249A779
Person / Time
Site: Ginna Constellation icon.png
Issue date: 03/17/1980
From: WHITE L D
ROCHESTER GAS & ELECTRIC CORP.
To: ZIEMANN D L
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0578, RTR-NUREG-578, TASK-06-04, TASK-6-4, TASK-RR NUDOCS 8003240381
Download: ML17249A779 (6)
v • d • e


Text

REGULATORYORMATIONDISTRIBUTIONSYS9(RIDS)ACCESSIONNBRt8003240381DOC~DATE;80/03/17NOTARIZED!NODOCKETFACIL;50204RobertEmmetGinnaNuclearPlantiUnitliRochesterG05000244AUTH,NAMEAUTHORAFFILIATIONWHITE,L,D,RochesterGas8ElectricCorp.RECIPNNAME.RECIPIENTAFFILIATIONZIEMANNiD~L,OperatingReactorsBranch2

SUBJECT:

RespondstoNRC'00211ltrreaddiinfo,oncontainmentpurge8ventsysExistingsysbeingmodifiedperNUREG0578to.requireindividua'1resettingofanyconta,inmentisolatiop-valverequiredtoIopenwheninitiatingsignalpresents1DISTRISUTIONCODE:ASSESCOPIESRECEIVED:LTRlENCL-4SIZEI-~----TITLE:SEPTopicsNOTES:JQ~+Ag+J1E~R.+AC~--'ECIPIENTCOPIESRECIPIENT~COPIESIDCODE/NAMELTTRENCLIDCODE/NAMELTTRENCL'CTION:19BCOg8INTERNAL:REGR10TA/EDO-13ENGRBR15PLANTSYSBR17EFFTTRT"SYSEXTERNAL:03LPDR23ACRS11602NRCPDR08ISEilCOREPERFBR14REACSFTYBR-16EEBSTSGROUPLEADR07NSIC1211'11MARS51980TOTALNUMBEROF-COPIESREQUIRED:LTTR~ENCL P~'

ZiZZZiZS/////I/I///gal////IIXI/I//E//Il/II//////SZuROCHESTERGASANDELECTRICCORPORATIONJ"'gwIIAtto,89EASTAVENUE,ROCHESTER,N.Y.14649LEOND.WHITE,JR.VICEPRESIDENTTELEPHONEARE*CDDETIE546.2700March17,1980DirectorofNuclearReactorRegulationAttention:Mr.DennisL.Ziemann,ChiefOperatingReactorsBranchNo.2U.S.NuclearRegulatoryCommissionWashington,D.C.20555

Subject:

SEPTopicVI-4,ContainmentIsolationSystemR.E.GinnaNuclearPowerPlantDocketNo.50-244

DearMr.Ziemann:

ThisletterisinresponsetoyourFebruaryll,1980letter,whichrequestedthefollowingadditionalinformationconcerningtheGinnacontainmentpurgeandventsystems.1.Theoverridingofonetypeofsafetyactuationsignalshouldnotcausetheblockingofanyothertypeofsafetyactuationsignaltotheisolationvalves.TheGinnaplantengineeredsafetyfeaturesapparentlyhaveseveraloverridesthatblockevenmanualactuation.Response:Asstatedinourlettertoyouonthesubjectsystem,datedDecember14,1979,thecontainmentpurgesystemhasbeendesignedtoprovidepurgingcapabilityfollowingaLOCA,whenhighcontainmentradiationandSIsignalsmaybepresent,tolimitpotentialhydrogenconcentrationsincontainmentduringthepostaccidentperiod.Inordertoperformthissafetyfunction,theresetsystemisdesignedtooverrideallcontainmentisolationinitiatingsignalsaslongasanyactuatingsignalispresent.TheexistingresetwithSection2.1.4requireindividualvalvewhichmaybesignalispresent.actions,includingsystemisbeingmodifiedinaccordanceandAppendixA2.1.4ofNUREG0578,toresettingofanycontainmentisolationrequiredtoopenwhileaC.I.initiatingAtleastthreedeliberateoperatoroperationofthecontainmentisolation80032408'I JlROCHESTERGASANDELECTRICCP.DATEMarch17,1980ToMr.DennisL.Ziemann,-ChiefSHEETNO.keyswitch,mustbeperformedbytheoperatorbeforeanytworedundantisolationvalves(potentialreleasepath)areopened(e.g.,purgeexhaust).Thisvirtuallyprecludesinadvertentviolationofcontainment,isolation.Proceduresrequireextensivereviewofplantconditionsbeforeinitiatinganyactionwhichwouldrequiretheopeningofanisolationvalveafteraneventwhichhascausedcontainmentisolation.Ifitweredecidedtoperformacontainmentpurgeduringaccidentconditions,greatcarewouldbetakenduringthisoperation.Thepersonnelperformingthissafetyfunctionwouldbeawareofthesignificanceoftheaction,andwouldbepreparedtoclosethevalvesifnecessaryforanyreason.Re-establishingcontainmentisolationwouldbeaquick,simpleprocess(closingtheappropriatevalveswitches).Itisnotconsideredthat.thisprocessrequiresanyfurthersimplification(suchashavingasystem-levelmanualisolationswitch).AnothersetofcircumstanceswhereinthecontainmentventilationisolationvalvesareblockedfromclosinguponreceiptofasafetyactuationsignalisdescribedinourDecember14,1979letteronthissubject.Intheeventthesevalvesareopen,andhighactivity(butnoSIsignal)ispresent,administrativeproceduresensurethattheresetwillnotbeuseduntilthehighactivityalarmhasbeencleared.TheSIsignalwillthusnolongerbeblocked,andbecapableofeffectingvalveclosure.2.Thesystemlevelannunciationoftheoverriddenstatusshouldbeprovidedforeverysafetysystemimpactedwhenanoverrideisactive.TheGinnaplantapparentlydoesnothavethiscapability.Response:Asnotedinourresponsetoitem(1)above,theresetpanelmatrixclearlydisplaysanyisolationvalvewhichisinaresetstatus.TherequirementreferredtoforsystemlevelannunciationofoverriddenstatusofsafetysystemsiscontainedinRegulatoryGuide1.47,BassedandInoerableStatusIndicationforNuclearPowerPlantSafetSstemswhichwasz.ssuedznMay1973.Theextenttowhichplants,suchasR.E.Ginna,whichweredesignedandconstructedpriortotheissuanceofthisRegulatoryGuide,arerequiredtoimplementitsrequirementsiscurrentlythesubjectofgenericreviewundertheSEPprogramandTMIrelatedNRCstaffprograms.Itisourpositionthatstatusmonitoringmodificationsshouldonlybemadeonanintegratedbasisforallsafetysystemsinaccordance'withcarefulconsiderationoftheman-machineinterface.

T,ROCHESTERGASANDELECTRICCP.DATEMarch17,1980ToMr.DennisL.Ziemann,ChiefSHEETNO.Treatingindividualsystems,suchascontainmentisolation,withoutregardtomaintainingaconsistent=statusmonitoringapproachtoallsafetysystemscouldleadtooperatorconfusionanderror.3.Theinstrumentationandcontrolsystemsprovidedtoinitiateengineeredsafetyfeaturesshouldbedesignedandqualifiedassafetygradeequipment.Discussthequalificationoftheisolationchannelandradiationchannelequipment.inthisregard.Response:Thecontainmentisolationsystem,includingtheactuatingchannels,wasdesignedandconstructedasaClassIEsystem.QualificationofelectricalandISCequipmenthasbeendescribedinourreporttoA.Schwencer,datedFebruary24,1978,onthesubject."EnvironmentalQualificationofElectricalEquipment,R.E.GinnaNuclearPowerPlantUnitNo.1".ThistopiciscurrentlybeingreviewedgenericallyundertheSEPprogram.4.TheoverridingorresettingoftheisolationactuationsignalshouldnotcausetheautomaticmotionofanyEngineeredSafetyFeaturevalve.YourletterofOctober17,1979andNovember19,1979indicatethatamodificationisplannedfortheupcomingMarchrefuelingoutage.Describehowthemodificationwillpreventautomaticvalvepositionchangesonresettingofisolationlogic,includingschematicdiagramsorsketchesasnecessary.Response:ThedetaileddesignofthecontainmentisolationmodificationwhichrequiresindividualresetforeachisolationvalveisbeingreviewedaspartoftheShort-TermLessonsLearnedProgram.Verytrulyyours,L.D.Whie,Jr.LDW:np

Retrieved from "https://kanterella.com/w/index.php?title=ML17249A779&oldid=654352"