ML17251A145

Corrected Proposed Tech Spec 1.4, Operable-Operability, Adding Word Support After Word Lubrication for Clarification

ML17251A145
Person / Time
Site:	Ginna
Issue date:	06/21/1988
From:	ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17251A136	List: ML17251A135 ML17251A145
References
NUDOCS 8807050018
Download: ML17251A145 (4)

Text

ATTACHMENT11.4'I'iable-erabilit1JHAsystem,subsystem,train,component'rdeviceshallbeoperableorhaveoperabilitywhenitiscapableofperformingitsspecifiedfunction(s).Implicitinthisdefinitionshallbetheassumptionthatallnecessaryattendantinstrumentation,controls,normaloremergencyelectricalpowersources(subjecttolSection3.0.2),coolingorsealwater;lubrication,supports,orotherauxiliaryequipmentthatarerequiredforthesystem,subsystem,train,componentordevicetoperformitsfunction(s)arealsocapableofperformingtheirrelatedsupportfunction(s).Amendment4g1-laPROPOSED88070500i888062iPDRADQCN,05000240PPDR

~4 ATTACHMENT21.ClarificationoftheJuly24,1987responsetoNRCStaffestion54reardinSGsnubbers.TheSGsnubbersarenotrequiredtobefunctionallytested,sincesnubberlockupisnotacrediblefailuremode.However,extensivemaintenanceisperformedonthesesnubbersinordertocomplywiththe"snubbersealservicelifemonitoring"TechnicalSpecification4.14.1.f.ThatmaintenanceisdescribedinProcedureM-40.7,whichprovidesinstructionsforremoval,inspection,maintenance,test,andreinstallationofAnker-Holthsnubbersonthesteamgenerators.Theseactivitiesincludedisassembly,cleaning,replacement.ofallsealsandreplacementofhydraulicfluid.Followingtherebuildingofthesnubber,ahydrostatictestisperformedoneachsnubbertoverifypressureintegrityandsealinstallation.Theseactivitiesareperformedatamaximumofa10yearintervalsoastoensuresnubbersealservicelifeisnotexceeded..TheresultsofthismaintenancearerecordedintheplantrecordsinaccordancewithproposedTechnicalSpecification6.10.2.m.All16steamgeneratorsnubbershavebeen.rebuilttwiceeachsinceplantstartup.2.ResonsetoNRCStaffestiononMechanicalSnubbersTheStandardTechnicalSpecificationsstatethatmechanicalsnubberfunctionaltestacceptancecriteriainclude:"Dragforceshallnothaveincreasedmorethan50%sincethelastfunctionaltest."Inlieuofthis,RG&EprovidesthefollowingmeansofmonitoringsnubberdragforcesintheGinnaStationSnubberInspectionandTestProgram.Theprogramrequiresfunctionaltestresultstobereviewedtodetermineacceptabilityofresults.Ifdragforce.isnotgreaterthan1%ofsnubbernormaldesignload,thesnubbermaybeinstalledinanylocation.Ifsnubberdragforceisbetween1-oand5%,thesnubberacceptabilityisbasedonatablecorrelatingsnubbersizewithpipesize.Overa5%dragisconsideredunacceptable.However,anysnubberwithadragforcegreaterthan2%isconsidereddegradedandisrequiredtoberepairedorr'eplacedasapreventivemaintenancemeasure.Thus,RG&Econsidersthattheidentificationofpotentialdegradationrelativetorequiredsnubberfunctionisconservativelyevaluatedandmonitoredinourpresentprogram.

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