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{{#Wiki_filter: | {{#Wiki_filter:ATTACHMENT ARevisetheTechnical Specification pagesasfollows:RemoveInsert3~1314.14-14.14-24.14-34.14-44.14-54.14-64.14-74.14-83~1314.14-14.14-24.14-34.14-44.14-54.14-64.14-74.14-84.14-94.14-109308130054 930806lPDRADOCK05000244PPDR | ||
~I3. | ~I3.13SnubbersLimitinCondition for0eration3.13.1WithRCSconditions abovecoldshutdown, allsafety-related, snubbersshallbeoperable. | ||
~~4.144.14.1~..~ | Thisspecification doesnotapplytothosesnubbersinstalled onnonsafety-related systemsifthesnubberfailure,andaresulting failureofthesupported nonsafety-related systemshowntobecausedbythatsnubberfailure,wouldhavenoadverseeffectonanysafety-related system.Action3.13.2Withoneormoresnubbersinoperable, within72hoursreplaceorrestoretheinoperable snubber(s) tooperablestatusandperformanengineering evaluation perSpecification 4.14.1fonthesupported component ordeclarethesupported systeminoperable andfollowtheappropriate Basisactionstatement forthatsystem.Snubbersarerequiredtobeoperabletoensurethatthestructural integrity ofthereactorcoolantsystemandall'othersafety-related systemsismaintained duringandfollowing aseismicorothereventinitiating dynamicloads.Snubbersmaybereplacedbyrigidstructural supports(bumpers) providedananalysisisperformed todemonstrate thatappropriate acceptance criteriaaresatisfied fordesignbasisseismicandpipebreakeventsandprovidedthatthebumpersareinspected periodically inamannerappropriate forrigidstructural supports. | ||
4.14.1.e.~.~ | Amendment No.3~131Proposed | ||
~...~4.14.1. | ~~4.144.14.1~..~SnubberSurveillance Reuirements EachsnubberrequiredbySpecification 3.13tobeOPERABLEshallbedemonstrated OPERABLEbytheperformance ofthefollowing inservice inspection programinadditiontotherequirements ofSpecification 4.2.a~b.InsectionTesAsusedinthisspecification, "typeofsnubber"shallmeansnubbersofthesamedesignandmanufacturer, irrespective ofcapacity. | ||
VisualInsectionsc~Snubbersarecategorized asinaccessible oraccessible duringreactoroperation. | |||
Eachofthesecategories (inaccessible andaccessible) maybeinspected independently according tothescheduledetermine byTable4.14-1.Thevisualinspection intervalforeachtypeofsnubbershallbedetermined baseduponthecriteriaprovidedinTable4.14-1.VisualInsectionAccetanceCriteriaVisualinspections shallverifythat(1)thesnubberhasnovisibleindications ofdamageorimpairedOPERABILITY, (2)attachments tothefoundation orAmendment No.j(P4.14-1Proposed 4.14.1.c.(continued) supporting structure arefunctional, and(3)fasteners fortheattachment ofthesnubbertothecomponent andtothesnubberanchorage arefunctional. | |||
Snubberswhichappearinoperable asaresultofvisualinspections shallbeclassified asunacceptable andmaybereclassified acceptable forthepurposeofestablishing thenextvisualinspection | |||
: interval, providedthat:(1)thecauseoftherejection isclearlyestablished andremediedforthatparticular snubberandforothersnubbers, irrespective oftypethat,maybegenerically susceptible; and(2)theaffectedsnubberisfunctionally testedintheas-foundcondition anddetermined OPERABLEperSpecification 4.14.1e.Allsnubbersfoundconnected toaninoperable commonhydraulic fluidreservoir shallbecountedasunacceptable fordetermining thenextinspection interval. | |||
Areviewandevaluation shallbeperformed anddocumented tojustifycontinued operation withanunacceptable snubber.Ifcontinued operation cannotbejustified, thesnubbershallbedeclaredinoperable andtheACTIONrequirement shallbemet.Amendment No.4.14-2Proposed TABLE4.14-1SNUBBERVISUALINSPECTION INTERVALNUMBEROFUNACCEPTABLE SNUBBERSRef.Note7Population orCategoryNotes1and2ColumnAExtendIntervalNotes3and6ColumnBRepeatIntervalNotes4and6ColumnCReduceIntervalNotes5and68010015020013300122540018365001224487501000orgreater2029405678109Note1:Thenextvisualinspection intervalforasnubberpopulation orcategorysizeshallbedetermined baseduponthepreviousinspection intervalandthenumberofunacceptable snubbersfoundduringthatinterval. | |||
Snubbersmaybecategorized, basedupontheiraccessibility duringpoweroperation, asaccessible orinaccessible. | |||
Thesecategories maybeexaminedseparately orjointly.However,thisdecisionmustbeAmendment No.P4.14-3Proposed TABLE4.14-1(continued) | |||
Note2:Note3:Note4:Note5:Note6:Note7:documented beforeanyinspection andshallbeusedasthebasisuponwhichtodetermine thenextinspection intervalforthatcategory. | |||
Interpolation betweenpopulation orcategorysizesandthenumberofunacceptable snubbersispermissible. | |||
UsenextlowerintegerforthevalueofthelimitforColumnsA,B,orCifthatintegerincludesafractional valueofunacceptable snubbersasdetermined byinterpolation. | |||
Ifthenumberofunacceptable snubbersisequaltoorlessthanthenumberinColumnA,thenextinspection intervalmaybetwicethepreviousintervalbutnotgreaterthan48months.Ifthenumberofunacceptable snubbersisequaltoorlessthanthenumberinColumnBbutgreaterthanthenumberinColumnA,thenextinspection intervalshallbethesameasthepreviousinterval. | |||
Ifthenumberofunacceptable snubbersisequaltoorgreaterthanthenumberinColumnC,thenextinspection intervalshallbetwo-thirds ofthepreviousinterval. | |||
However,ifthenumberofunacceptable snubbersislessthanthenumberinColumnCbutgreaterthanthenumberinColumnB,thenextintervalshallbereducedproportionally byinterpolation, thatis,thepreviousintervalshallbereducedbyafactorthatisone-third oftheratioofthedifference betweenthenumberofunacceptable snubbersfoundduringthepreviousintervalandthenumberinColumnBtothedifference inthenumbersinColumnBandC.Theprovisions ofSpecification Section4.0areapplicable forallinspection intervals uptoandincluding 48months.Todetermine thenextsurveillance | |||
: interval, anunacceptable snubbermaybereclassified asacceptable ifitcanbedemonstrated thatthesnubberisoperableinitsas-foundcondition byperformance ifafunctional testandifitsatisfies theacceptance criteriaforfunctional testing.Amendment No.4.14-4Proposed Atleastonceper18monthsduringshutdown, arepresentative sample(atleast10'fthesnubbersrequiredbySpecification 3e13)shallbefunctionally testedeitherinplaceorinabenchtest.Foreachsnubberthatdoesnotmeetthefunctional testacceptance criteriaofSpecification 4.14.1e,anadditional 10'fthesnubbersshallbefunctionally testeduntilnomorefailuresarefoundoruntilallsnubbershavebeenfunctionally tested.Therepresentative sampleselectedforfunctional testingshall,asfaraspractical, includethevariousconfigurations, operating environments, rangeofsizesandcapacities ofsnubbers. | |||
Inadditiontotheregularsample,snubbersplacedinthesamelocations assnubberswhichfailedthepreviousfunctional testshallberetestedatthetimeofthenextfunctional test.Additionally, ifafailedsnubberhasbeenrepairedandreinstalled inanotherlocation, thatfailedsnubbershallalsoberetested. | |||
Thesesnubbersshallnotbeincludedintheregularsample.Ifduringthefunctional testing,additional samplingisIProposedAmendment No.Pj/4.14-5requir'ed duetofailureofonlyonetypeofsnubber,thefunctional testingresultsshallbereviewedatthattimetodetermine ifadditional samplesshouldbelimitedtothetypeofsnubberwhichhasfailedthefunctional testing. | |||
4.14.1.e. | |||
~.~Functional TestAccetanceCriteriaThesnubberfunctional testshallverifythat:1)Activation (restraining action)isachievedwithinthespecified rangeinbothtensionandcompression; 2)Snubberbleed,orreleaseratewhererequired, ispresentinbothtensionandcompression, withinthespecified range;3)Whererequired, theforcerequiredtoinitiateormaintainmotionofthesnubberiswithinthespecified rangeinbothdirections oftravelland4)Forsnubbersspecifically requirednottodisplaceundercontinuous load,theabilityofthesnubbertowithstand loadwithoutdisplacement isverified. | |||
Testingmethodsmaybeusedtomeasureparameters indirectly orparameters otherthanthosespecified ifthoseresultscanbecorrelated tothespecified parameters throughestablished methods.Functional TestFailureAnalsisAnanalysisshallbemadeofeachfailuretomeetthefunctional testacceptance criteriatodetermine thecauseofthefailure.TheresultsofthisanalysisAmendment No.gjf4.14-6Proposed shallbeused,ifapplicable, inselecting snubberstobetestedinanefforttodetermine theoperability ofothersnubbers, irrespective oftype,whichmaybesubjecttothesamefailuremode.Forthespecificcaseofasnubberselectedforfunctional testingwhicheitherfailstoactivateorfailstomove,i.e.,frozen-in-place,thecausewillbeevaluated and,ifcausedbymanufacturer ordesigndeficiency, allsnubbersofthesametypesubjecttothesamedefectshallbefunctionally testedorevaluated inamannertoensuretheiroperability. | |||
Anytestingperformed aspartofthisrequirement shallbeindependent oftherequirements statedinSpecification 4.14.1dforsnubbersnotmeetingthefunctional testacceptance criteria. | |||
Foranysnubbersfoundinoperable, anengineering evaluation shallbeperformed onthecomponents towhichtheinoperable snubbersareattached. | |||
Thepurposeofthisengineering evaluation shallbetodetermine ifthecomponents towhichtheinoperable snubbersareattachedwereadversely affectedbytheinoperability ofthesnubbersinordertoensurethatthecomponent remainscapableofmeetingthedesignedservice.Amendment No.P4.14-7Proposed | |||
~...~4.14.1.gSnubberSealServiceLifeMonitorzn Thesealservicelifeofhydraulic snubbersshallbemonitored andsealsreplacedasrequiredtoensurethattheservicelifeisnotexceededbetweensurveillance inspections duringaperiodwhenthesnubberisrequiredtobeoperable. | |||
Thesealreplacements shallbedocumented andthedocumentation shallberetainedinaccordance withTechnical Specification 6.10.2.BasisSnubbersareprovidedtoensurethatthestructural integrity ofthereactorcoolantsystemandallothersafetyrelatedsystemsismaintained duringandfollowing aseismicorothereventinitiating dynamicloads.Thevisualinspection frequency isbasedonthenumberofunacceptable snubbersfoundduringthepreviousinspection inproportion tothesizesofthevarioussnubberpopulations orcategories. | |||
Asnubberisconsidered unacceptable ifitfailstheacceptance criteriadelineated bySpecification 4.14.1.c. | |||
Thevisualinspection intervalisbaseduponthepreviousinspection intervalandmaybeaslongastwofuelcycles,nottoexceed48months,depending onthenumberofunacceptable snubbersfoundduringthepreviousvisualinspection. | |||
Amendment No.4.14-8Proposed Basiscontinued Unacceptable snubbersshallbeevaluated todetermine iftheyareinoperable. | |||
Forinoperable snubberstheapplicable actionrequirements shallbemet.When,asnubberisfoundinoperable, anengineering evaluation ofthesupported component isperformed inordertodetermine ifanysafety-related component orsystemhasbeenadversely affectedbytheinoperability ofthesnubber.Thisevaluation isinadditiontothedetermination ofthesnubbermodeoffailure.Theengineering evaluation shalldetermine whetherornotthesnubberfailurehasimpartedasignificant effectonorcauseddegradation ofthesupported component orsystem,toensuretheyremaincapableofmeeting'he designedservice.Whenthecauseoftherejection ofasnubberisclearlyestablished andremediedforthatsnubberandforanyothersnubbersthatmaybegenerically susceptible, andverifiedbyinservice functional testing,thatsnubbermaybeexemptedfrombeingcountedasinoperable. | |||
Generically susceptible snubbersarethosewhichareofaspecificmakeormodelandhavethesamedesignfeaturesdirectlyrelatedtothesnubberrejectedorarethosewhicharesimilarly locatedorexposedtothesameenvironmental conditions suchastemperature, radiation, andvibration. | |||
Todetermine thenextsurveillance | |||
: interval, anunacceptable snubbermaybereclassified asacceptable ifitcanbedemonstrated thatthesnubberisoperableinitsas-foundcondition byperformance ofafunctional testandifitsatisfies theacceptance criteriaforfunctional testing.Amendment No.jf/I4.14-9Proposed Basiscontinued Toprovideassurance ofsnubberfunctional reliability, arepresentative sampleoftheinstalled snubberswillbefunctionally testedduringplantshutdowns atlessthanorequalto18monthintervals. | |||
Observedfailuresofthesesamplesnubbersshallrequirefunctional testingofadditional units.Hydraulic snubbersandmechanical snubbersmayeachbetreatedasadifferent entityfortheabovesurveillance programs. | |||
Theservicelifeofasnubberisevaluated viamanufacturer inputandengineering information throughconsideration ofthesnubberserviceconditions andfunctional designrequirements. | |||
Theonlysnubbercomponents withservicelivesnotexpectedtoexceedplantlifearesealsando-ringsfabricated fromcertainsealmaterials. | |||
Therefore, asealreplacement programisrequiredtomonitorsnubbersealando-ringservicelifetoassuresnubberoperability isnotdegradedduetoexceeding component servicelife.Amendment No.4.14-10Proposed}} | |||
Revision as of 13:00, 29 June 2018
| ML17263A357 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 08/06/1993 |
| From: | ROCHESTER GAS & ELECTRIC CORP. |
| To: | |
| Shared Package | |
| ML17263A356 | List: |
| References | |
| NUDOCS 9308130054 | |
| Download: ML17263A357 (13) | |
Text
ATTACHMENT ARevisetheTechnical Specification pagesasfollows:RemoveInsert3~1314.14-14.14-24.14-34.14-44.14-54.14-64.14-74.14-83~1314.14-14.14-24.14-34.14-44.14-54.14-64.14-74.14-84.14-94.14-109308130054 930806lPDRADOCK05000244PPDR
~I3.13SnubbersLimitinCondition for0eration3.13.1WithRCSconditions abovecoldshutdown, allsafety-related, snubbersshallbeoperable.
Thisspecification doesnotapplytothosesnubbersinstalled onnonsafety-related systemsifthesnubberfailure,andaresulting failureofthesupported nonsafety-related systemshowntobecausedbythatsnubberfailure,wouldhavenoadverseeffectonanysafety-related system.Action3.13.2Withoneormoresnubbersinoperable, within72hoursreplaceorrestoretheinoperable snubber(s) tooperablestatusandperformanengineering evaluation perSpecification 4.14.1fonthesupported component ordeclarethesupported systeminoperable andfollowtheappropriate Basisactionstatement forthatsystem.Snubbersarerequiredtobeoperabletoensurethatthestructural integrity ofthereactorcoolantsystemandall'othersafety-related systemsismaintained duringandfollowing aseismicorothereventinitiating dynamicloads.Snubbersmaybereplacedbyrigidstructural supports(bumpers) providedananalysisisperformed todemonstrate thatappropriate acceptance criteriaaresatisfied fordesignbasisseismicandpipebreakeventsandprovidedthatthebumpersareinspected periodically inamannerappropriate forrigidstructural supports.
Amendment No.3~131Proposed
~~4.144.14.1~..~SnubberSurveillance Reuirements EachsnubberrequiredbySpecification 3.13tobeOPERABLEshallbedemonstrated OPERABLEbytheperformance ofthefollowing inservice inspection programinadditiontotherequirements ofSpecification 4.2.a~b.InsectionTesAsusedinthisspecification, "typeofsnubber"shallmeansnubbersofthesamedesignandmanufacturer, irrespective ofcapacity.
VisualInsectionsc~Snubbersarecategorized asinaccessible oraccessible duringreactoroperation.
Eachofthesecategories (inaccessible andaccessible) maybeinspected independently according tothescheduledetermine byTable4.14-1.Thevisualinspection intervalforeachtypeofsnubbershallbedetermined baseduponthecriteriaprovidedinTable4.14-1.VisualInsectionAccetanceCriteriaVisualinspections shallverifythat(1)thesnubberhasnovisibleindications ofdamageorimpairedOPERABILITY, (2)attachments tothefoundation orAmendment No.j(P4.14-1Proposed 4.14.1.c.(continued) supporting structure arefunctional, and(3)fasteners fortheattachment ofthesnubbertothecomponent andtothesnubberanchorage arefunctional.
Snubberswhichappearinoperable asaresultofvisualinspections shallbeclassified asunacceptable andmaybereclassified acceptable forthepurposeofestablishing thenextvisualinspection
- interval, providedthat:(1)thecauseoftherejection isclearlyestablished andremediedforthatparticular snubberandforothersnubbers, irrespective oftypethat,maybegenerically susceptible; and(2)theaffectedsnubberisfunctionally testedintheas-foundcondition anddetermined OPERABLEperSpecification 4.14.1e.Allsnubbersfoundconnected toaninoperable commonhydraulic fluidreservoir shallbecountedasunacceptable fordetermining thenextinspection interval.
Areviewandevaluation shallbeperformed anddocumented tojustifycontinued operation withanunacceptable snubber.Ifcontinued operation cannotbejustified, thesnubbershallbedeclaredinoperable andtheACTIONrequirement shallbemet.Amendment No.4.14-2Proposed TABLE4.14-1SNUBBERVISUALINSPECTION INTERVALNUMBEROFUNACCEPTABLE SNUBBERSRef.Note7Population orCategoryNotes1and2ColumnAExtendIntervalNotes3and6ColumnBRepeatIntervalNotes4and6ColumnCReduceIntervalNotes5and68010015020013300122540018365001224487501000orgreater2029405678109Note1:Thenextvisualinspection intervalforasnubberpopulation orcategorysizeshallbedetermined baseduponthepreviousinspection intervalandthenumberofunacceptable snubbersfoundduringthatinterval.
Snubbersmaybecategorized, basedupontheiraccessibility duringpoweroperation, asaccessible orinaccessible.
Thesecategories maybeexaminedseparately orjointly.However,thisdecisionmustbeAmendment No.P4.14-3Proposed TABLE4.14-1(continued)
Note2:Note3:Note4:Note5:Note6:Note7:documented beforeanyinspection andshallbeusedasthebasisuponwhichtodetermine thenextinspection intervalforthatcategory.
Interpolation betweenpopulation orcategorysizesandthenumberofunacceptable snubbersispermissible.
UsenextlowerintegerforthevalueofthelimitforColumnsA,B,orCifthatintegerincludesafractional valueofunacceptable snubbersasdetermined byinterpolation.
Ifthenumberofunacceptable snubbersisequaltoorlessthanthenumberinColumnA,thenextinspection intervalmaybetwicethepreviousintervalbutnotgreaterthan48months.Ifthenumberofunacceptable snubbersisequaltoorlessthanthenumberinColumnBbutgreaterthanthenumberinColumnA,thenextinspection intervalshallbethesameasthepreviousinterval.
Ifthenumberofunacceptable snubbersisequaltoorgreaterthanthenumberinColumnC,thenextinspection intervalshallbetwo-thirds ofthepreviousinterval.
However,ifthenumberofunacceptable snubbersislessthanthenumberinColumnCbutgreaterthanthenumberinColumnB,thenextintervalshallbereducedproportionally byinterpolation, thatis,thepreviousintervalshallbereducedbyafactorthatisone-third oftheratioofthedifference betweenthenumberofunacceptable snubbersfoundduringthepreviousintervalandthenumberinColumnBtothedifference inthenumbersinColumnBandC.Theprovisions ofSpecification Section4.0areapplicable forallinspection intervals uptoandincluding 48months.Todetermine thenextsurveillance
- interval, anunacceptable snubbermaybereclassified asacceptable ifitcanbedemonstrated thatthesnubberisoperableinitsas-foundcondition byperformance ifafunctional testandifitsatisfies theacceptance criteriaforfunctional testing.Amendment No.4.14-4Proposed Atleastonceper18monthsduringshutdown, arepresentative sample(atleast10'fthesnubbersrequiredbySpecification 3e13)shallbefunctionally testedeitherinplaceorinabenchtest.Foreachsnubberthatdoesnotmeetthefunctional testacceptance criteriaofSpecification 4.14.1e,anadditional 10'fthesnubbersshallbefunctionally testeduntilnomorefailuresarefoundoruntilallsnubbershavebeenfunctionally tested.Therepresentative sampleselectedforfunctional testingshall,asfaraspractical, includethevariousconfigurations, operating environments, rangeofsizesandcapacities ofsnubbers.
Inadditiontotheregularsample,snubbersplacedinthesamelocations assnubberswhichfailedthepreviousfunctional testshallberetestedatthetimeofthenextfunctional test.Additionally, ifafailedsnubberhasbeenrepairedandreinstalled inanotherlocation, thatfailedsnubbershallalsoberetested.
Thesesnubbersshallnotbeincludedintheregularsample.Ifduringthefunctional testing,additional samplingisIProposedAmendment No.Pj/4.14-5requir'ed duetofailureofonlyonetypeofsnubber,thefunctional testingresultsshallbereviewedatthattimetodetermine ifadditional samplesshouldbelimitedtothetypeofsnubberwhichhasfailedthefunctional testing.
4.14.1.e.
~.~Functional TestAccetanceCriteriaThesnubberfunctional testshallverifythat:1)Activation (restraining action)isachievedwithinthespecified rangeinbothtensionandcompression; 2)Snubberbleed,orreleaseratewhererequired, ispresentinbothtensionandcompression, withinthespecified range;3)Whererequired, theforcerequiredtoinitiateormaintainmotionofthesnubberiswithinthespecified rangeinbothdirections oftravelland4)Forsnubbersspecifically requirednottodisplaceundercontinuous load,theabilityofthesnubbertowithstand loadwithoutdisplacement isverified.
Testingmethodsmaybeusedtomeasureparameters indirectly orparameters otherthanthosespecified ifthoseresultscanbecorrelated tothespecified parameters throughestablished methods.Functional TestFailureAnalsisAnanalysisshallbemadeofeachfailuretomeetthefunctional testacceptance criteriatodetermine thecauseofthefailure.TheresultsofthisanalysisAmendment No.gjf4.14-6Proposed shallbeused,ifapplicable, inselecting snubberstobetestedinanefforttodetermine theoperability ofothersnubbers, irrespective oftype,whichmaybesubjecttothesamefailuremode.Forthespecificcaseofasnubberselectedforfunctional testingwhicheitherfailstoactivateorfailstomove,i.e.,frozen-in-place,thecausewillbeevaluated and,ifcausedbymanufacturer ordesigndeficiency, allsnubbersofthesametypesubjecttothesamedefectshallbefunctionally testedorevaluated inamannertoensuretheiroperability.
Anytestingperformed aspartofthisrequirement shallbeindependent oftherequirements statedinSpecification 4.14.1dforsnubbersnotmeetingthefunctional testacceptance criteria.
Foranysnubbersfoundinoperable, anengineering evaluation shallbeperformed onthecomponents towhichtheinoperable snubbersareattached.
Thepurposeofthisengineering evaluation shallbetodetermine ifthecomponents towhichtheinoperable snubbersareattachedwereadversely affectedbytheinoperability ofthesnubbersinordertoensurethatthecomponent remainscapableofmeetingthedesignedservice.Amendment No.P4.14-7Proposed
~...~4.14.1.gSnubberSealServiceLifeMonitorzn Thesealservicelifeofhydraulic snubbersshallbemonitored andsealsreplacedasrequiredtoensurethattheservicelifeisnotexceededbetweensurveillance inspections duringaperiodwhenthesnubberisrequiredtobeoperable.
Thesealreplacements shallbedocumented andthedocumentation shallberetainedinaccordance withTechnical Specification 6.10.2.BasisSnubbersareprovidedtoensurethatthestructural integrity ofthereactorcoolantsystemandallothersafetyrelatedsystemsismaintained duringandfollowing aseismicorothereventinitiating dynamicloads.Thevisualinspection frequency isbasedonthenumberofunacceptable snubbersfoundduringthepreviousinspection inproportion tothesizesofthevarioussnubberpopulations orcategories.
Asnubberisconsidered unacceptable ifitfailstheacceptance criteriadelineated bySpecification 4.14.1.c.
Thevisualinspection intervalisbaseduponthepreviousinspection intervalandmaybeaslongastwofuelcycles,nottoexceed48months,depending onthenumberofunacceptable snubbersfoundduringthepreviousvisualinspection.
Amendment No.4.14-8Proposed Basiscontinued Unacceptable snubbersshallbeevaluated todetermine iftheyareinoperable.
Forinoperable snubberstheapplicable actionrequirements shallbemet.When,asnubberisfoundinoperable, anengineering evaluation ofthesupported component isperformed inordertodetermine ifanysafety-related component orsystemhasbeenadversely affectedbytheinoperability ofthesnubber.Thisevaluation isinadditiontothedetermination ofthesnubbermodeoffailure.Theengineering evaluation shalldetermine whetherornotthesnubberfailurehasimpartedasignificant effectonorcauseddegradation ofthesupported component orsystem,toensuretheyremaincapableofmeeting'he designedservice.Whenthecauseoftherejection ofasnubberisclearlyestablished andremediedforthatsnubberandforanyothersnubbersthatmaybegenerically susceptible, andverifiedbyinservice functional testing,thatsnubbermaybeexemptedfrombeingcountedasinoperable.
Generically susceptible snubbersarethosewhichareofaspecificmakeormodelandhavethesamedesignfeaturesdirectlyrelatedtothesnubberrejectedorarethosewhicharesimilarly locatedorexposedtothesameenvironmental conditions suchastemperature, radiation, andvibration.
Todetermine thenextsurveillance
- interval, anunacceptable snubbermaybereclassified asacceptable ifitcanbedemonstrated thatthesnubberisoperableinitsas-foundcondition byperformance ofafunctional testandifitsatisfies theacceptance criteriaforfunctional testing.Amendment No.jf/I4.14-9Proposed Basiscontinued Toprovideassurance ofsnubberfunctional reliability, arepresentative sampleoftheinstalled snubberswillbefunctionally testedduringplantshutdowns atlessthanorequalto18monthintervals.
Observedfailuresofthesesamplesnubbersshallrequirefunctional testingofadditional units.Hydraulic snubbersandmechanical snubbersmayeachbetreatedasadifferent entityfortheabovesurveillance programs.
Theservicelifeofasnubberisevaluated viamanufacturer inputandengineering information throughconsideration ofthesnubberserviceconditions andfunctional designrequirements.
Theonlysnubbercomponents withservicelivesnotexpectedtoexceedplantlifearesealsando-ringsfabricated fromcertainsealmaterials.
Therefore, asealreplacement programisrequiredtomonitorsnubbersealando-ringservicelifetoassuresnubberoperability isnotdegradedduetoexceeding component servicelife.Amendment No.4.14-10Proposed