ML17261A938

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Forwards Response to Generic Ltr 89-13 Re Svc Water Problems Affecting safety-related Equipment.Circulating Water Chlorination,Using Sodium Hypochlorite to Prevent Biofouling,Performed Twice Per Wk from May Through Oct
ML17261A938
Person / Time
Site: Ginna Constellation icon.png
Issue date: 01/29/1990
From: MECREDY R C
ROCHESTER GAS & ELECTRIC CORP.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
GL-89-13, NUDOCS 9002120077
Download: ML17261A938 (10)


Text

ACCELERATED DI<UTIONDEMONSTIONSYSTEM4REGULATORY INFORMATION DISTRXBUTION SYSTEM(RXDS)ACCESSION NBR-9002120077 DOC.DATE:

90/01/29NOTARXZED:

YESFACXL:50-244 RobertEmmetGinnaNuclearPlant,Unit1,Rochester GAUTH.NAMEAUTHORAFFILIATION MECREDY,R.C.

Rochester Gas&ElectricCorp.RECIP.NAME RECIPIENT AFFILXATION Region1,OfcoftheDirectorDOCKET05000244

SUBJECT:

ForwardsresponsetoGenericLtr89-13resvcwaterproblemsaffecting safety-related equipment.

DISTRIBUTION CODE:A065DCOPIESRECEIVED:LTR ENCLSIZE:TXTLE:GenericLtr89-13-SvcWaterSysProblemsAffecting Safety-Related EDSNOTES:License Expdateinaccordance with10CFR2,2.109(9/19/72).

05000244RECIPIENT IDCODE/NAME JOHNSON,A INTERNAL:

CHU-~ANRR/PD1-3 EGFIEXTERNAL:

LPDRNSICCOPIESLTTRENCL1111111111RECXPIENT IDCODE/NAME NUDOCS-ABSTRACT NRCPDRCOPIESLTTRENCL11D(SDNOTETOALL"RIDS"RECIPIENTS:

PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.20079)TOELIMINATE YOURNAMEFROMDISTRIBUTION LISTSFORDOCUMENTS YOUDON'TNEED!TOTALNUMBEROFCOPIESREQUIRED:

LTTR7ENCL7DD

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AP,::ROCHESTER GASANDELECTRICCORPORATION o89EASTAVENUE,ROCHESTER, NY.146490001January29,1990KKKKPH0Nf.ARK*COOK7IK546-2700U.S.NuclearRegulatory Commission RegionalAdministrator, RegionI475Allendale RoadKingofPrussia,PA19406

Subject:

ResponsetoGenericLetter89-13,ServiceWaterSystemProblemsAffecting Safety-.Related Equipment R.E.GinnaNuclearPowerPlantDocketNo.50-244

DearMr.Russell:

ZnresponsetoGenericLetter89-13,pleasefindattachedsummaries ofproposedprogramsthatRochester GasandElectricintendstoimplement tosatisfyeachofthefiverecommendations ofsubjectletter.Youwillnotethatseveraloftheseprogramshavealreadybeeninitiated.

Verytrulyyours,RobertC.MecredyGeneralManagerNuclearProduction Subscribed andsworntobeforemeonth29thdayofJanuary,1990SAMUELRSAOWNBNTARYPU8UC,SaoctNewYo4Nn,49170i1hQnueOy.l Wins+.QCenerhshn BphaDee.26I,1+f P~//)<IIl'llCJMN076Attachment 9002120077 900i29PDRADOCK05000244PDC BHNOA8AJBUMA8koYeeNhcaOPXLRNATNtt4ttQM~haA.QeqNl.+endNdh8M)"'t~M~n~~.,

zc:Mr.AllenR.Johnson(MailStop14D1)ProjectDirectorate I-3U.S.NuclearRegulatory Commission Washington, D.C.20555U.S.NuclearRegulatory Commission DocumentControlDeskWashington, D.C.20555GinnaSeniorResidentInspector lATTACHMENT RESPONSETOGENERICLETTER89-13Thisresponsetotherequirements ofNRCGenericLetter89-13describes theintentofRG&Etoimplement Recommendations I-Vortoestablish equallyeffective coursesofaction.RECOMMENDATION IADDRESSING THECONCERNSOFGENZRICISSUE51ItemATheintakestructure shouldbevisuallyinspected, onceperrefueling cycle,formacroscopic biological foulingorganisms (forexample,bluemusselsatmarineplants,Americanoystersatestuarine plants,andAsiaticclamsatfreshwater plants),sediment, andcorrosion.

Inspections shouldbeperformed eitherbyscubadiversorbydewatering theintakestructure orbyothercomparable methods.Anyfoulingaccumulations shouldberemoved.~ResnseGinnaunderwater servicewaterstructures andequipment haveperiodically beenvisuallyinspected'hroughout theoperating historyoftheplant.Procedure M-92,Underwater Inspection ofMechanical Equipment and'Structures intheScreenhouse (performed annually),

Procedure M-92.1,Underwater Inspection andMaintenance oftheIntakeStructure andShaft(performed every5years),andProcedure M-92.2,Inservice Inspection ofMiscellaneous WaterControlStructures atGinna(performed annually) arecurrently inplaceandutilizedatGinnaStation,and.havebeenshowntobeeffective basedonthehistorical operability andreliability oftheServiceandCirculating WaterSystems.ItemBTheservicewatersystemshouldbecontinuously (forexample,duringspawning) chlorinated (orequallyeffectively treatedwithanotherbiocide)wheneverthepotential foramacroscopic biological foulingspeciesexists(forexample,bluemusselsatmarineplants,Americanoystersatestuarine plants,andAsiaticclamsatfreshwater plants).Chlorination orequallyeffective treatment isincludedforfreshwater plantswithoutclamsbecauseitcanhelppreventmicrobiologically influenced corrosion.

However,thechlorination (orequallyeffective) treatment neednotbeasstringent, forplantswherethepotential formacroscopic biological.

foulingspeciesdoesnotexistcomparedtothoseplantswhereitdoes.Precautions shouldbetakentoobeyFederal,State,andlocalenvironmental regulations regarding theuseofbiocides.

~ResonsettCirculating waterchlorination usingsodiumhypochlorite topreventbiofouling isperformed twiceweeklyfromMaythroughOctober.GinnaStationStatePollution Discharge Elimination System(SPDES)Permitlimitschlorination to120minutesperdaywiththedailymaximumtotalresidualchlorinelimitedto0.2mg/L.NewYorkStateDepartment ofEnvironmental Conservation (NYDEC)hasstressedchlorineminimization foranumberofyears.Bothreducedresidualchlorineallowedduringchlorination

-fromOe5mg/Lto0.2mg/Lat.thelastSPDESPermitrenewal-andreducedfrequency ofchlorination havebeenstressed.

Informally, Rochester GasandElectrichasgradually reducedthechlorination seasonandthefrequency ofchlorination duringtheseason.GinnaStationSPDESPermitrenewalhearingsarecurrently underway.

Application parameters, including chlorination practices fornormalcircumstances arebeingdiscussed aswellaspossiblecoursesofactionintheadventofzebramusselmigration toGinnaStation.SeeItemD.below.ItemCRedundant andinfrequently usedcoolingloopsshouldbeflushedandflowtestedperiodically atthemaximumdesignflowtoensurethattheyarenotfouledorclogged..

Othercomponents intheservicewatersystemshouldbetestedonaregularscheduletoensurethattheyarenotfouledorclogged.Servicewatercoolingloopsshouldbefilledwithchlorinated orequivalently treatedwaterbeforelayup.Systemsthatuserawservicewaterasasource,suchassomefireprotection systems,shouldalsobechlorinated orequallyeffectively treatedbeforelayuptohelppreventmicrobiologically influenced corrosion.

Precautions shouldbetakentoobeyFederal,State,andlocalenvironmental regulations regarding theuseofbiocides.

R~esonseAflushingprogramfortheservicewatersystemwillbeestablished at,GinnaStationonlyasneededtoaugmentperiodicinspections nowrequiredaspartofRG&E'sInservice TestingProgram,whichrequiresfullflowtestingorinspection anddisassembly ofallcheckvalvestoensureadequateServiceWaterflowtosafety-relatedequipment.

Apolicyofchlorination forlaidupServiceWaterloopswillbeperformed asdescribed inGenericLetter89-13exceptfortheFireSystem.Ginna'scomprehensive yearlyFireSystemtestingandinspection programscontrolled byprocedures adequately detectsystemfoulingordegradation.

ItemDttSamplesofwaterandsubstrate shouldbecollected annuallytodetermine ifAsiaticclamshavepopulated thewatersource.Waterandsubstrate samplingisonlynecessary atfreshwater plantsthathavenotprevi.ously detectedthepresenceofAsiaticclamsintheirsourcewaterbodies.IfAsiaticclamsaredetected, utilities maydiscontinue thissamplingactivityifdesired,andthechlorination (orequallyeffective) treatment programshouldbemodifiedtobeinagreement withparagraph Babove.~ResnseStartingin1990,thefollowing monitoring programswillbeinstituted fortheAsiaticclams(Corbicula s.)andthezebramussel(Dreissena olorha):A)Anannualbenthicsamplingprogramwillbeconducted.

Sampleswillbetakenfromthefollowing transects:

1)thenearshore area(toadepthof5meters)oftheGinnaNuclearPowerPlant;2)neartheplantintakestructure.

Thesampleswillbeexaminedforthepresenceofbivalvemollusks.

B)IntakecoolingwaterwillbesampledtwiceamonthfromMaythroughAugust.Thesampleswillbeexamined.

forpresenceofbivalvemollusks.

C)Representative components oftheservicewatersystem(i.e.,dieselgenerator coolers)willbeinspected forthepresenceofbivalvemolluskswhenopenedduringannualoutages.IfthepresenceofeithertheAsiaticclamorthezebramusselisdetermined byanyoftheabovemethods,futuremonitoring forthatspecieswillbeterminated.

Ifneithermolluskisfound,themonitoring willcontinueonlyforspeciesthatarecapableofsurviving intheareaoftheGinnaNuclearPowerPlant.Monitoring wouldbediscontinued forthosespeciesonwhichdocumentation isavailable statingthatitwouldnotbeabletosurviveinLakeOntario.RECOMMENDATION IIHEATTRANSFERCAPABILITY TESTPROGRAM~ResenseRG&Ewillcontinuetoperformregularmaintenance oftheServiceWater-related heatexchangers.

Duringthe1989Refueling Outage,thefollowing heatexchangers wereinspected, disassembled and.cleaned:a)Component CoolingWater(both)b)SpentFuelPitc)Emergency DieselGenerator (both)d)TurbineLubeOilCoolere)Auxiliary Feedwater Pumps(all3)f)ElectroHydraulic OilCooler(both)

Thefollowing areeduledforthe1990RefugOutage:1)Emergency DieselGenerator (both)2)TurbineLubeOilCooler3)Auxiliary Feedwater Pumps(all3)4)ElectroHydraulic OilCooler(both)Nosignificant levelsoffoulingwerenotedtodateinheatexchangers after20yearsofoperation.

RG&Eisalsodetermining thefeasibility ofperforming periodictestsofselectedheatexchangers, inaccordance withEnclosure 2to.GenericLetter89-13.Thepurchaseofadditional instrumentation, development oftestprocedures, andestablishment ofacceptance criteriawillbepursued.Atestingschedulewillbeestablished basedontheresultsoftheseeffortsbythe1992Refueling Outage.TheclosedcycleComponent CoolingWaterheatexchangers areconsidered withinthescopeoftheprogram.However,becauseofthefavorable inspection resultsduringthe1988and1989Refueling Outages,showingnegligible deterioration afterlongyearsofoperation, andbecauseofthestringent chemistry controlassociated.

withtheCCWloop(maintaining pHbetween8.0and9.0byadditionofsodiumhydroxide andmaintaining chromateconcentration between175and225ppmbyadditionofpotassium chromate),

noadditional testingisscheduled unlessperiodicinspections, indicateadegradation oftheheatexchangers.

RECOMMENDATION IXIESTABLISH ROUTINEMAINTENANCE ANDINSPECTION PROGRAM~ResenseAsnotedinResponseII,RG&E'asbeenperforming routineinspection ofsafety-related (including Service.Water)heatexchangers.

RG&E.hasalsoinitiated aReliability CenteredMaintenance Program,whichincludestheServiceWaterSystem.Thisprogram,previously discussed.

withtheNRC,isastate-of-the-art systemusedtooptimizemaintenance activities forthesystemswithin-itsscope.It,isconsidered thatthesemeasuresconstitute anacceptable levelofinspection and.maintenance tomeettherecommendations ofGenericLetter89-13.RECOMMENDATION IVCONFXRMATXON OFINTENDEDFUNCTION~ResonseRG&Ehas,aspartofourP&IDUpgradeProgram,completed asystemwalkdownasofDecember29,1989.Thiseffortreconciled.

theas-builtsystemwithourcontrolled configuration drawings(theP&IDs).Inaddition, RG&Eisintheprocessofperforming aconfirmatory singleactivefailureanalysisreview.AlthoughRG&Eintendstocompletethisreviewprior-totheendofthe1991Refueling Outage,in-accordance withGenericLetter89-13,thefullscopeofthisreviewhasnotyetbeenestablished.

If-additional timeisrequired, RG&EwillinformtheNRC.

ftECOMMENDATION VCONFXRMATION THATSERVXCEWATERSYSXLLFUNCTXONASINTENDEDANDTHATEUIPMENTWXLLPERFORMEFFECTIVELY

~ResonseNormally, theGinnaMaintenance, Operating andEmergency Operating Procedures areallreviewedonaregularthreeyearschedule.

Maintenance Procedures aregivenfurtherreviewasdetermined byfocusedresultsthroughtheeffortsofGinna'scontinuing Reliability CenteredMaintenance Program.Emergency Operating Procedures receiveanadditional levelofreviewbythePlantEmergency Operating Procedures Committee.

Alloftheaboveprocedures arevalidated throughtheeffortsoftheGinnaINPOaccredited Operating andMaintenance TrainingProgramstoensurethatsafety-related equipment cooledbytheServiceWaterSystemwillfunctionasintendedandthattheequipment willperformeffectively.

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