Text

Revision to Post-Shutdown Decommissioning Activities Report
	ML15338A222
Person / Time
Site:	Three Mile Island
Issue date:	12/04/2015
From:	Halnon G; GPU Nuclear
To:	; Document Control Desk, Office of Nuclear Material Safety and Safeguards
References
	TMI-15-093
	Download: ML15338A222 (27)
	v • d • e

GI'NUCLEAN GPUNuclear, Inc.

ThreeMilelsland NuclearStation Route441South Post0fficeBox480 Middletown.PA17057-0480 Tel717-948-8461 December 4,2015 TMt-15-093 1 0c F R5 0 . 5 1 10cFR 50.82 Attn:Document ControlDesk U.S.NuclearRegulatory Commission Washington, D.C.20555-0001

Subject:

ThreeMilelslandNuclearStation,Unit2 DocketNo.50-320,Possession OnlyLicenseNo. DPR-73 Revisionto Post-Shutdown Decommissioninq ActivitiesReport By letterdatedNovember18,2013(Accession No. ML133234497) GPU Nuclear,Inc.(GPUN)submiftedRevision1 of the ThreeMilelslandNuclear Station,Unit2 (TMl2)Post-Shutdown Decommissioning ActivitiesReport (PSDAR)to the NuclearRegulatory Commission (NRC).As a resultof changes to the TMl2decommissioning costanalysis, whichwas submitted to the NRCby letterdatedMarch27,2015(Accession No.ML15086A337), the TMl2PSDAR was revised.Additionally, otheradministrative changesweremadeto the PSDAR.The revisedinformation is identifiedby a revisionbar in the rightpage marginwitha revisionnumberadjacentto the revisionbar. Revision2 of the TMl2 PSDARis attachedand shouldreplaceRevision1 in its entirety.

ThreeMilelslandNuclearStation,Unit2 TMt-15-093 Page2 Thereare no regulatorycommitments containedin this letter. lf thereare any questionsor if additional information pleasecontactMr.ThomasA. Lentz, is required, Manager, FleetLicensing, at 330-315-6810.

President

Attachment:

ThreeMile lslandNuclearPowerStation,Unit2 Post-Shutdown Decommissioning ActivitiesReport,Revision2, December2015 cc: NRCRegionlAdministrator NRCSeniorResidentInspector NRCProjectManager DirectorBRP/DEP Site BRP/DEPRepresentative

Attachment TMt-15-093 Page1 of25 ThreeMilelslandNuclear Un',t2 PowerStation, Post-ShutdownDecommissioning Report Activities Revision 2 December 2015

Attachment TMt-15-093 Page2 of 25 Tableof Contents SECTION PAGE I. INTRODUCTION 3 II. BACKGROUND 4 III. DESCRIPTION OF DECOMMISSIONING ACTIVITIES 6 IV. SCHEDULE OF DECOMMISSIONING ACTIVITIES 11 V. ESTIMATED COSTSOF DECOMMISSIONING ACTIVITIES 12 VI. ENVIRONMENTAL IMPACTS OF DECOMMISSIONING ACTIVITIES 15 VII. REFERENCES 25 REVISION HISTORY Revision Number RevisionDescription 0 lnitiallssue (June2013) lncorporated information to updateTable1 to 2012dollars (November 20131 C h a n g easr eo n P a g e s1 , 2 , 1 4 ,a n d1 5 2 fncorporatedinformation resultingfrom 2014Decommissioning CostAnalysis,revisedinformation on the post-defueling monitored storageagreement,and incorporated various admin istrativeclarifications (December 2015)

Changes areon Pages1, 2, 5 through15,and25

Attachment TMt-15-093 Page3 ot 25 I. INTRODUCTION GPUNuclear,Inc.(GPUN),actingfor itselfandfor the Metropolitan Edison Company,JerseyCentralPowerand LightCompany,andthe Pennsylvania ElectricCompany,hasdeveloped thispost-shutdown decommissioning activities report(PSDAR)for the ThreeMilelslandNuclearStation,Unit2 (TMl-2)in accordance withthe requirements of 10 CFR50.82,"Termination of license,"

paragraph (aXaXi).

TMI-2hasa possession onlylicense(POL),and is currentlymaintained in accordance withthe NuclearRegulatory Commission (NRC)approvedSAFSTOR condition(methodin whicha nuclearfacilityis placedandmaintained in a condition that allowsit to be safelystoredand subsequently decontaminated) known as post-defuelingmonitored storage(PDMS).GPUNhasmaintained TMI-2in the PDMS statesincethe NRCprovisions for cleanupweremetandacceptedin 1993.

By letterdatedAugust14,2012,GPUNinformedthe NRCof theTMI-2status relativeto the 1996Decommissioning Rulechangesspecifically relatedto 10 CFR50.51,"Continuation of license,"and 10 CFR 50.82,"Termination of license."

The letterstatedthe intentto submita PSDARthat describesthe planned decommissioning activities, schedule, costestimates, andthe environmental impacts of TMf-2 plant specificdecommissioning. By NRCletterdatedFebruary13,2013,the NRCstatedthat September14, 1993is consideredthe dateof TMI-2'scessationof operations.

The followingPSDARreportis providedin accordancewiththe requirements in 10 CFR50.82.ThePSDARincludes:

A description of the planneddecommissioning activities, A schedulefor theiraccomplishment, A site-specific decommissioning costestimateincludingthe projected costof managingirradiated fuel,and A discussion thatprovidesthe reasonsfor concluding thatthe environmental impactsassociated withsite-specificdecommissioning activitieswill be boundedby previously issuedenvironmental impact statements.

Dueto the uniquenatureof TMI-2,GPUNhas includeda Sectionll, "Background," in the PSDARreportto provideinformation on the design,history, and currentstatusof the ThreeMib lslandNuclearStationUnit2. Sectionslll throughV addressthe 10 CFR50.82requirements to describeand providea

Attachment TMI-15-093 Page4 of 25 scheduleandcostestimatefor the planneddecommissioning activities.

SectionVl providesthe reasonsfor concluding thatthe activitiesplannedfor the decommissioning of TMI-2are boundedby previously issuedenvironmental impactstatements.SectionVll providesa listof referencesusedin the PSDAR.

II. BACKGROUND TMI-2is locatedon the northern-most sectionof ThreeMile lslandnearthe east shoreof the Susquehanna Riverin DauphinCounty,Pennsylvania. The station is comprisedof two pressurized waterreactors.The TMI NuclearStation includesthe operatingUnit1, ownedby ExelonGeneration Company,LLC (Exelon),andthe shutdownUnit2 ownedby GPUN.

TMI-2is a non-operational pressurizedwaterreactorthatwas ratedat a core thermal power levelof 2772megawatt-thermal with a corresponding turbine-generatorgrossoutputof 959 megawatt-electric. TMI-2employeda two loop pressurized waterreactornuclearsteamsupplysystemdesignedby Babcock andWilcoxCorporation.The reactorcoolantsystemis housedwithina steel-lined,post-tensioned concretestructure(reactorbuilding),in the shapeof a right, verticalcylinderwith a hemispherical domeand a flat, reinforcedconcrete basemat.A weldedsteellinerplate,anchoredto the insidefaceof the reactor building,servesas a leak-tight membrane.

GPUNwas issuedan operatinglicensefor TMI-2on February8, 1978,with commercial operation declaredon December 30, 1978.On March28,1979,the unitexperienced an accidentinitiatedby interruptionof secondaryfeedwater flow.

The lackof secondaryfeedwaterresultedin the reductionof primary-to-secondaryheatexchangethat causedan increasein the reactorcoolant temperature, creatinga surgeintothe pressurizer, and an increasein system pressure.The pressureoperatedreliefvalve(PORV)openedto relievethe pressure,butfailedto closewhenthe pressuredecreased.The reactorcoolant pumpswereturnedoff and a coreheat-upbeganas the reactorcoolantsystem waterinventorycontinuedto decreaseresultingin a reactorvesselwaterlevel belowthe top of the core. This ledto a coreheatup that causedfuel damage.

The majorityof the fuel materialtravelleddownthroughthe regionof the southeastern assembliesand intothe corebypassregion.A portionof the fuel materialpassedaroundthe bypassregionand migrateddownintothe lower internalsand lowerheadregion,but overallreactorvesselintegritywas maintained throughout the accident.

Attachment TMt-15-093 Page5of25 As a resultof thisaccident, smallquantities of coredebrisandfissionproducts weretransported throughthe reactorcoolantsystemandthe reactorbuilding.In addition,a smallquantityof coredebriswastransported to the auxiliaryandfuel handlingbuildings.Furtherspreadof the debrisalsooccurredas partof the post-accident waterprocessingcleanupactivities.

The quantityof fuel remaining at TMI-2is a smallfractionof the initialfuel load; approximately 99 percent(%)was successfully removedin the defueling.

Additionally,largequantities of radioactive fissionproductsthatwerereleasedinto varioussystemsand structureswereremovedas partof the wasteprocessing activitiesduringthe TMI-2Clean-upProgram.The cleanupto meetthe NRCpost accidentsafestoragecriteriawas completedand acceptedby the NRCwithTMI-2 enteringintopost-defueling monitored storagein 1993.

NUREG-0683, "TheProgrammatic Environmental lmpactStatement Relatedto Decontamination and Disposalof Radioactive WastesResultingfromthe March28,1979AccidentThreeMilelslandNuclearStation,Unit2,"Supplement 3 (PEIS)discusses performed the activities to achievethe PDMSstateat TMI-2.

The PEISevaluatesthe activitiesassociatedwiththe post-accident cleanupfor environmental impact,and addresses amountof decontamination the significant andwasteremovalthatwouldnormallybe partof a decommissioning plan,which werecompletedto achievePDMS.

Approximately 99%of the fuelwas removedand shippedto the ldahoNational Engineering and Environmental Laboratory (INEEL)underthe responsibility of the Department of Energy(DOE).The reactorcoolantsystemwas decontaminated to the extentpracticalto reduceradiationlevelsto as lowas is reasonablyachievable(ALARA).As partof the decontamination effort,water was removedto the extentpracticalfromthe reactorcoolantsystemandthe fuel transfercanal,and the fuel transfertubeswereisolated.Radioactive wastes fromthe majorclean-upactivitieshavebeenshippedoff-siteor has been packagedand stagedfor shipmentoff-site.

Following the decontamination onlythe reactorbuildinganda few activities, areasin the auxiliaryandfuelhandlingbuibingscontinued to havegeneralarea radiationlevelshigherthanthoseof an undamaged reactorfacilitynearingthe end of its operatinglife.

GPUNmaintained TMI-2in the PDMSstatewhilesuccessfully operating TMI-1 untilAmerGen (a jointventurebetweenPhiladelphia EnergyCompany British and Energy)purchased the operating TMI-1fromGPUNin 1998.The saleof TMI-1 includedthe Unit1 buildings, structures, andthe majorityof the siteproperty; however,GPUNmaintained ownership of TMI-2.

Itr

Attachment TMt-15-093 Page6 of 25 FirstEnergy acquiredGPUNandownership of TMI-2in 2001as partof a larger acquisition of GPU. In December 2003,Exelonacquiredsoleownership of TMI-1.

A monitoring agreement betweenGPUNand Exelonprovidesfor Exelon performing certainfunctionsat TMI-2,on behalfof GPUN,whileTMI-2is in PDMS.

Thesefunctionsincludemaintenance andtesting,radiological andenvironmental controls,securityandsafetyfunctionsand licensing activitiesrequired by the PDMSTechnicalSpecifications and PDMSFinalSafetyAnalysisReport.

A 2004site-specific costanalysisfor decommissioning TMI-2assumeda delayed DECONscenario, whichdeferredthe decontamination anddismantling at activities TMI-2untiltheyaresynchronized withTMI-1suchthatthe licensesfor bothunits areterminated concurrently. Thisscenarioassumeda 1O-year dormancyperiod for TMI-2,following the TMI-1originaflicenseexpiration in 2014,with decommissioning preparation to beginin about2024.The initialschedule assumeddecommissioning operations wouldbeginin about2026,andwouldbe completedovera 1O-year periodwith site restorationprojectedin 2036. Sincethat time a 2O-year extensionto the TMI-1operatinglicensehas beengrantedby the NRC. Thiswarranted a revisionto the decommissioning costanalysisfor TMI-2.

A2014 site-specific costanalysisfor TMI-2evaluateda DECONscenariothat assumesTMI-1wouldcommencedecommissioning uponcessation of operations in 2034andthatthe decommissioning programsfor bothunitswouldrun independently fromeachother.TheTMI-2PSDARestablishes the schedule for the decommissioning of TMI-2to commence followingthe expiration of the TMI-1 Operating Licenseon April 19,2034,withTMI-2licensetermination occurringin 2053.

III. DESCRIPTION OF DECOMMISSIONING ACTIVITIES The objectiveof decommissioning TMI-2is to safelyperformallthe activities associated withdecontamination anddismantlement of the remaining plant systems,components, structures,andfacilitiesin a costeffectivemanner.The decommissioning planassumesthatTMI-2is effectively maintained in the current SAFSTORmodeof PDMSuntilsometimeafterthe expiration of the TMI-1 operatinglicensein 2034.The decontamination anddismantling activities at TMI-2 will run independently of the decommissioning activitiesfor TMI-1, with the TMI-2 licensetermination occurringin 2053.

Attachment TMt-15-093 Page7 of 25 The decommissioning planfor TMI-2involvesactivities to addressthe higher sourcetermmaterials to eliminateelementsthatwould contributeto higher workerexposureduringactivities thataretypicalof decommissioning an operating plantat the end of plantlife.

Thedecommissioning willfocuson the useof bothultrahighpressurewater spraysand mechanical decontamination methodsfor the removalof the remaining highsourcetermmaterials.Sincethe majorityof the spentfuelhas alreadybeenremovedfrom siteand transferred to a DOEfacility,thereis no needto constructan independent spentfuelstorageinstallation (lSFSl)specific to TMI-2.GPUNwillexploretwo optionsfor storageandtransferof the remaining residualfuelandgreaterthanclassC (GTCC)waste. First,GPUNwill workwiththe DOEto obtainauthorization to transportthe remainingfuel and GTCCwasteto INEEL,wherethe majorityof TMI-2spentfuel is currentlystored, or to an alternatestorageor repositorylocationdesignatedby DOE,if available, by thattime. lf DOEstorageoptionsare notdeemedviable,GPUNwillexplore an agreement withExelonto havethe remaining TMI-2fuelandGTCCstoredin the TMI-1ISFSIuntila DOEgeological repository becomesoperational.

Basedon the aboveoverallplan,the decommissioning of TMI-2hasbeen dividedintothe followingperiods:

PDMS(SAFSTORDormancy)

Preparations for Decommission ing Decomm issioningOperations Site Restoration.

Thefollowingprovidesa discussion of the decommissioning plan,the significant andthe generalsequencing activities, of activitiesin eachof the aboveperiods.

The planningrequiredfor eachdecommissioning activity,includingthe selection processto performthe work,will be completedpriorto the startof workfor that activity.

Period1: PDMS(SAFSTORDormancy)

The PDMScondition was established following the accidentat TMI-2to establish an inherentlystableand safeconditionof the facilitysuchthattherewas no risk to the publichealthand safety. The PDMSstatehas beenapprovedby the NRC and is governedby a PDMSSafetyAnalysisReport,PDMSTechnical Specifications, and PDMSQualityProgram.

Attachment TMt-15-093 Page8 of 25 The PDMSTechnicalSpecification requirements to monitorandsurvey radiologicalconditions havebeenestablished and maintained since1993. Site securityis maintainedas a contractedserviceby Exelonthat ownsand operates TMt-1.

As discussedin the TMI-2PDMSSafetyAnalysisReport:

Thereis no crediblepossibility of nuclearcriticality.

Fueland coredebrisremovedfromthe reactorvesseland associated systemshas beenshippedoffsite.

Any potentialfor significantreleaseof radioactivity has been eliminated.

Waterhas beenremovedto the extentpracticalfromthe reactor coolantsystemandfuel transfercanal,and fuel transfertubeshave beenisolated.The treatmentand processingof accidentgenerated waterhas beencompleted.

Radioactive wastefromthe majorcleanupactivitieshas beenshipped off-siteor has beenpackagedfor shipmentoff-site.

Radiationwithinthe facilityhas beenreduced,as necessary, consistentwithALAM principlesto levelsthatwill allownecessary plantmonitoring the performance activities, of requiredmaintenance, and any necessary inspections.

The PDMSdormancyperiodis expectedto extendsometimebeyondthe end of TMI-1operatinglicensein 2034. In the eventthatcircumstances dictatean earliershutdownof TMI-1,the expectedTMI-2PDMSdormancy periodmaybe reduced,withthe PSDARbeingrevisedto reflectan updateddecommissioning schedule.

Period2: Preparations for Decommissioning A decommissioning organizationalstructureand selectedstaffwill be developed to identifyroles,responsibilities, andaccountabilities for the decommissioning preparations anddecommissioning operations.

Preparations includethe planningfor the removalof the remaining residualfuel, decontamination of the structures,anddismantling the remaining equipment and facilities.

Attachment TMt-15-093 Page9 of 25 In preparationfor actualdecommissioning, activitiesthatwill be performed include:

Conducta characterization of the siteandthe surrounding environs.

Thisincludesradiation surveysof the reactorbuildingincluding basement, elevatorblockwallarea,areassurrounding major components, internalpiping,and primaryshieldcores.

Conductradiation surveysof the auxiliary andfuelhandlingbuildings withemphasison areaswithknownand potential alphacontamination, and knownfissionproducts.

Conductradiation surveysandsampleanalysison exteriorbuildings, landareassurrounding the facility,subsurface soilandgroundwater.

ldentification radioactive of transportanddisposalrequirements wasteand hazardouswaste.

for highly rE o Developprocedures for occupational exposurecontrol,controland handlingof liquidandgaseouseffluents, processing of radioactive waste,site security,emergency programs, and industrialsafety.

Period3: Decommissioning Operations The actualdecommissioning anddismantlement of TMI-2willoccurduringthe periodof decommissioning operations.Significant decommissioning to activities be performed duringthisperiodinclude,but are not limitedto, thoselistedbelow.

Someof the activities are uniqueto the decommissioning of TMI-2,but a number of theseactivitiesmay be coordinated with Exelonas they may be neededto supportthedecommissioning of TMI-1. IE Construction of temporaryfacilitiesor modifications to existingfacilities to supportdismantlement activities.

Designandfabrication of temporary and permanent shielding to supportremovaland transportation activities,construction of contamination controlenvelopes,and the procurement of specialty tooling.

Procurement of shippingcontainers, caskliners,and industrial packages for packaging.

Attachment TMt-15-093 Page1Oof25 Reconfiguration and modification of site structuresandfacilitiesas neededto supportdecommissioning operations.Thismayincludethe upgrading of roadsand railfacilities to facilitatehaulingandtransport.

Decontamination of components and structuresas requiredto reduce sourcetermandcontrol(minimize) workerexposure.

Inventory, decontamination, and removalof legacyequipment inventory leftoverfromdefueling campaign.

Disassembly and segmentation of the remainingreactorvessel internals.Someinternalsare expectedto exceedGTCCrequirements.

As such,the segments willbe appropriately packagedfor disposal.

Removalof controlroddrivehousingsand the headservice structurefrom reactorvesselhead.

Segmentation of the reactorvesselhead.

Segmentation of the reactorvessel.

Removalof the steamgeneratorsand pressurizer for material recoveryand controlleddisposal.

Removalof the free standingconcretestructures,and the remaining internalstructures in the reactorbuildingincluding: polarcrane, biological shield,D-rings, floors,etc.

A licensetermination plan(LTP),in accordance with 10 CFR50.82(a)(9), willbe preparedat leasttwo yearspriorto the anticipateddateof licensetermination.

The LTPwill includea sitecharacterization, description of remaining dismantling plans activities, for site remediation, updatedcostestimateto completethe decommissioning, anyassociated environmental concerns, designation of the end use of the site,and the procedures for the final radiation survey. The LTP will be developed followingthe guidancecontainedin Regulatory Guide1.179, "StandardFormatand Contentof LicenseTermination Plansfor NuclearPower Reactors."As describedin Regulatory Guide1.179,the LTPwillusethe guidancecontainedin NUREG-1575, "Multi-Agency Radiation SurveyandSite InvestigationManual(MARSSIM)" to developthe finalradiological surveyplan and surveymethods.The useof MARSSIM to developthe finalradiological surveyplanand surveymethodswill demonstrate compliancewiththe requirements 10 CFR20, SubpartE, "Radiological Criteriafor License Termination." Oncethe LTPis approved, the finalremediation of the site

Attachment TMt-15-093 Page11 of25 facilitiesandservicescancommence.Theseactivities include,butare not limitedto:

Removalof remaining plantsystemsandcomponents as theybecome nonessential to the decommissioning program,or workerhealthand safety(forexample,wastecollectionand processingsystems, electricalpowerand ventilationsystems).

Removalof contaminated yardpipingandanycontaminated soil.

Remediation and removalof the contaminated equipment andmaterial fromthe auxiliaryandfuelbuildings, andanyothercontaminated facility.

Useof the NUREG-1575 guidanceensuresthatthe surveysare conducted in a mannerthatprovidesa highdegreeof confidence thatapplicable NRCcriteria are satisfied.Oncethe finalsurveyis complete,the resultsare providedto the NRC. The NRCwillterminate the licenseif it determines thatsiteremediation hasbeenperformed in accordance withthe LTP,andthatthe terminalradiation surveyand associateddocumentation demonstrate thatthe facilityis suitablefor release.

Period4 - Site Restoration Following completion of decommissioning operations, siterestoration activities will begin.Siterestoration willinvolvethe dismantling anddisposalof any remaining non-radiological structures.Restoredareasof the sitewillbe backfilled, gradedandlandscaped to supportvegetation for erosioncontrol.

IV. SCHEDULE OF DECOMMISSIONING ACTIVITIES The decommissioning planfor TMI-2can be characterized as followinga decontamination approach.The schedulefor decommissioning of TMI-2is basedon the assumption thatthe TMI-2decommissioning activitiescommence afterthe cessation of TMI-1operation.

The highlevelschedulefor decommissioning of TMI-2assumesthatthe PDMS SAFSTORdormancyperiodwillextendpastthe TMI-1shutdowndate. During thistime,the preparation for TMI-2decommissioning will begin.As decommissioning approaches, schedulevariations to accountfor availability of wastedisposalfacilities andcoordination

Attachment TMt-15-093 Page12of25 with Exelonand vendorswill be incorporated.lt is notexpectedthatthese variationswill impactthe overallcompletion schedule.

The schedulefor decommissioning of TMI-2hasbeendeveloped in orderto achievethe termination of licenseby September 2053. Thistermination date ensurescompliance withthe NRCrequirement to completedecommissioning 60 yearsfrom certificateof cessationto operateas definedin 10 CFR 50.82(aX3).

In the eventof any unforeseen circumstances that shouldwarranta requestthat TMI-2licensetermination be allowedbeyondSeptember 2053,GPUNwill notify the NRCto requestconsideration of an exemption to the 60-year requirement as definedin 10 CFR50.82(aX3).As notedin letterfromthe NRC to GPUNdatedFebruary13,2013,the equivalent to the certificateof cessationof operations was determinedto be the NRC'sissuanceof TMI-2 LicenseAmendment 45, converting the TMI-2operatinglicenseto a possession onfylicense.Thisamendment was grantedon September14,1993and establishes that dateas the datethatTMI-2is consideredto havesubmitted of permanentcessationof operations.Uponreceiptof NRC certification terminationof license,site restoration activitieswill commence.lt is estimated thatthe TMI-2site restoration activitieswill take approximately oneyear,with the restorationactivitiesbeingcompletedin 2053.

Majormilestones established for decommissioning of TMI-2are listedin the table below.

MAJORDECOMMISSIONING ACTIVITY DATES TMI-2PDMSSAFSTORDormancy TMI-1Shutdown 1993-2041 Aprif19,2434 tr TMI-2Decommissioning TMI-2Decommissioning TMI-2Site Restoration Preparation Operations 2040-2441 2041- 2052 2052- 2053 tr V. ESTIMATED COSTSOF DECOMMISSIONING ACTIVITIES In February1996,TLG Services,Inc.completed the firstTMI-2site-specific decommissioning costanalysisthatwasdeveloped for GPUN.Thatanalysis was updatedin 2004,2009,and2014and has beenrefinedto reflectcurrent assumptions pertainingto disposition of the nuclearunitand relevantindustry experience in undertaking decommissioning projects.

The decommissioning activities for TMI-2are a continuation of the decontamination effortsstartedin the 1980s.The costestimaterecognizes the presentstateof TMI-2 decontamination, contingency for unknownor uncertain conditions, of the availability

Attachment TMt-15-093 Page13of25 lowand highlevelradioactive wastedisposalsites,andsiteremediation requirements. The methodology usedto developthe costanalysisfollowsthe basic approachdevelopedby the AtomicIndustrialForum(nowthe NuclearEnergy Institute)in AIF/NESP-036, "Guidelinesfor Producing Commercial NuclearPower PlantDecommissioning CostEstimates." The methodusesa unitcostfactor approach,including application of workdifficultyadjustment factorsto develop decommissioning activitycosts,and incorporates localinformationrelatedto labor rates,as wellas latestavailableindustryexperience.The unitfactormethod providesa demonstrable basisfor establishing reliablecostestimates.The detail providedin the unitfactors,including activityduration, laborcosts(bycraft),and equipment and consumable costs,ensuresthatessentialelementshavenotbeen omitted.

The estimatepresentedhereinis baseduponthe mostrecentupdateto the site specificcostanalysiscompletedby TLG Servicesin December2014,whichwas providedto the NRCas partof the 10 CFR50.75(fX1), "Reportingand record keepingfor decommissioning planning,"submittalon March27,2015(Accession No.M115086A337).

Consistent witha signedmemorandum of understanding betweenFirstEnergy Corp. (parent of GPUN)and Exelonregarding the timingof decommissioning activitiesat TMI-2,it is assumedthatdecommissioning at TMI-2will not beginuntil the expiration of the TMI-1operatinglicensein2034.

Therearea numberof considerations that affectthe methodfor decommissioning the TMI-2siteandthe degreeof restoration required.The costanalysisincludes the considerations identifiedbelow.

The majorityof the fuelwasremovedduringthe TMI-2CleanupProgram's reactorvesseldefueling effortthatconcluded in January1990.Titleto thisfuel was transferredto the Department of Energy(DOE). The remainderof the fuel (about1%)is dispersed withinthe primarysystemandto a lesserextentin other systemsand structures.This residualmaterialwillbe removedas radioactive waste. Therefore,the costof managingirradiatedfuel is not reflectedwithinthe estimates to decommission the TMI-2site.

It is expectedthattherewill be somewastes,(GTCCwaste)generatedin the decommissioning of TMI-2thatare notsuitablefor shallowlandburialand thereforecannotbe shippedfor disposaluntila highlevelwasterepositoryis madeavailableby DOE. Althoughthe materialis notclassified as high-level

Attachment TMt-15-093 Page14of25 waste,the DOEhas indicatedtheywill acceptthiswastefor disposalat the future high-levelwasterepository.However,the DOEhas not developedan acceptance criteriaor disposition schedulefor thismaterial, and numerous questionsremainas to the ultimatedisposalcostandwasteformrequirements.

Forpurposesof the costanalysis,it is assumedthatGTCCwastewill be packagedanddisposedof as high-level waste. lt is alsoassumedthatthe DOE willacceptthe GTCCmaterialin a timelymannerso as notto affectthe TMI-2 decommissioning schedule.No additional costsare included for the temporary storageof GTCCmaterial.

The decommissioning costanalysisfor TMI-2hasbeensummarized in Table1.

The valuesfor the tablecamefromthe site specificcostanalysiscompletedby TLG Servicesin December 2014. The valuesin the analysiswerepresented in 2013dollars.Thesevalueswereescalated to 2014dollarsby usingan escalation factorof 2.77percentl.

ThisPSDARwill notbe updatedfor minorchangesin anticipated decommissioning costs. However, the statusof TMI-2decommissioning funding willcontinueto be reportedto the NRCin accordance with 10 CFR50.75(0(1) and 10 CFR50.82(aX8)(v). Thisreportwillinclude, at a minimum, the assumptions usedin the ratesof escalationof decommissioning costsand ratesof earnings usedin fundingprojections. Additionally, GPUN,in accordance with 10 CFR 50.82(a)(7), will informthe NRCin writing(witha copysentto Pennsylvania),

beforeperforming anydecommissioning activityinconsistentwithor makingany significantschedulechangefromthoseactionsandschedules describedin the PSDAR,including changesthatsignificantly increasethe decommissioning cost.

GPUNwillalsoincludean updatedsitespecificestimateof remaining decommissioning costsin the licensetermination planin accordance with 10 CFR 50.82(a)(9XiiXF). Theannual10 CFR50.75(0(1) reportscontinueto demonstrate that the currentfundbalancesare morethanadequateto coverthe expected futurecostof decommissioning. In the eventthatfutureestimatedcostsor funding levelschangesignificantly, GPUNwillmakethe necessary adjustments to ensure thatsufficientfundsremainavailable for decommissioning.

1 TLGServices,Inc.Report,"Escalation Analysisfor ThreeMib lslandUnit2 2013Site-Specific Decommissioning CostEstimate"datedFebruary2015

Attachment TMt-15-093 Page15of25 TABLE1 TMI-2DECOMMISSIONING COST

SUMMARY

1 (Thousands basedon2014dollars)

Decontamination $ 36,384 Removal $ 194,301 Packaging $ 29,794 Transportation,Off-siteWaste Processing, and Disposal $ 322,278 ProgramManagement $ 497,930 MiscellaneousEquipment $ 24,512 lnsuranceand RegulatoryFees $ 16,203 OtherDecommissioninq Gosts $ 101.096 Total DecommissioningGosts $ 1,221,488 Note1 - Mathematicalroundingperformedduringthe development of the calculation.

VI. ENVIRONMENTAL IMPACTS OF DECOMMISSIONING ACTIVITIES 10 CFR50.82(a)(a)(i) requiresthatthe PSDARinclude"a discussion thatprovides the reasonsfor concludingthatthe environmental impactsassociatedwiththe site-specificdecommissioning activitieswillbe boundedby appropriate previously issued environmental impactstatements ..." The potentialenvironmental impacts associatedwiththe proposeddecommissioning activitiesfor TMI-2werecompared withsimilarimpactsgivenin the PEISrelatedto post-accident cleanupactivities resufting fromthe March28,1979accident; andwithNUREG-0586, "Generic Environmental lmpactStatement on Decommissioning of NuclearPower Facilities,"datedAugust1988andSupplement 1, Volumes1 and2, dated November2002(collectively knownas GEIS)on decommissioning and radiological criteriafor licensetermination.Thefollowingdiscussion providesthe comparison.

PEIS The PEISidentifiedthatthe post-accident cleanupactivitiescan be categorized intofourfundamental activities:

1 . Buildingandequipment decontamination, 2 . Fuelremovaland the reactorcoolantsystemdecontamination, 3 . Treatment of radioactive liquids,and

4. Packaging, handling,shipment, anddisposalof radioactive wastes

Attachment TMr-15-093 Page16of25 Theseactivities wereusedin the evaluation of the alternativesto GPUN's proposedactionof delayeddecommissioning. As describedin the PEIS,the NRCevaluatedsevenalternatives refativeto delayeddecommissioning. The NRCconcluded(exceptfor the no actionalternative, whichwas not considered acceptable) thatno alternative wasfoundto be superiorto GPUN'sproposal from an environmental impactperspective.

Of the sevenalternatives evaluatedin the PEIS(exceptfor the no action alternative)as wellas the proposedGPUN'sdelayeddecommissioning plan,the NRCconcluded thateachalternative couldbe conducted in conformance with applicable regulatory requirements and implemented withoutsignificant impactto the humanenvironment. Hence,it is reasonable to concludethatthe activities described for the TMI-2decommissioning will be accomplished withno adverse environmental impactsbaseduponthe following:

o The activities to be performed for decommissioning areequivalent to the activitiesperformedduringthe post-accident cleanupevaluatedin the PEIS, The radiation controltechniques anddecontamination methodssince the postTMI-2accidentcleanuphaveimproved, No site-specific activities pertaining to TMI-2decommissioning would alterthe conclusions of the PEIS, Radiation doseto the publicwillbe minimal,and Radiation doseto decommissioning workerswill be maintained ALARA according to 10 CFRPart20.

As notedin the PEIS,the outcomeof completing the clean-upactivities at TMI-2 wouldresultin manyareasdecontaminated to the pointwhere general areadose ratesapproximate thosein an undamagedreactorfacilitynearingthe end of its operatinglife.

GEIS The remaining decommissioning activitiesfor the delayeddecommissioning of TMI-2can be compared evaluatedin the GEIS.

to the activities As a generalmatter,TMI-2is smallerthanthe referencePWRusedin NUREG-0586to evaluatethe environmental impactsof decommissioning, and is likewise smallerthana numberof PWRsthatwereevaluatedin NUREG-0586, Supplement 1.

Attachment TMt-15-093 Page17 of25 Decommissioning activities are identified in AppendixE of NUREG-0586, Supplement 1. No activities planned for TMI-2deviatefromthe activities listedin termsof environmental impact.A deviation existsin termsof the variables associated withtransuranic fueland highersourceterms. However, these variables are addressed throughcontrolled decontamination anddismantlement, andfollowingNRCregulations associated withdose. So longas decontamination anddismantlement are performed withinthe guidelines of the regulations regardingreleaseof effluents,occupational dose,and offsitedose; andGTCCwasteis containedin approvedshippingcontainers; the decommissioning activities at TMI-2are directlycomparable to the activities evaluatedin the GEIS.

NUREG-0586, Supplement 1, Section4.3,"Environmental lmpactsfromNuclear PowerFacilityDecommissioning," providesa listingof 18 issuespertinent to the decommissioning of a reactor.A discussion of theseissuesfollows.

1. Onsite/Offsite LandUse The GEISconcluded thatthe impactson landuseare notdetectable or smallfor facilitieshavingonlyonsiteland-usechangesas a resultof largecomponent removal,structure dismantlement, and lowlevelwastepackaging and storage.

Thereare no anticipated changesin landusebeyondthe siteboundaryduring decommissioning. Therefore, it can be concluded thatthe impactson landuse arebounded by the GEIS.

2. WaterUse Sincethe shutdownof TMI-2andthe entryintothe PDMSstate,the demandfor potablewaterhasdecreased significantly belowthe demandduringoperation.

The operational demandfor coolingwater,makeupwater,and servicewaterhas ceased.The demandfor waterneededto conductplantdecommissioning activities(flushingpiping,hydro-lasing, dustabatement, etc.)will be lessthanthe demandfor watersupplyduringoperation.Hence,the impactson wateruseare boundedby the GEIS.

3. WaterQuality- Non-Radiological Programs and processes designedto minimize, detect,andcontainspillswill be maintained throughout the decommissioning process.Federal,stateand local regulations, and permitspertaining to waterqualitywill remainin effect,and no significantchangesto watersupplyreliabilityare expected.Therefore,the impactof TMI-2decommissioning on waterqualityis boundedby the GEIS.

Attachment TMt-15-093 Page18 of 25

4. AirQuality Thereare manytypesof decommissioning activitiesthat havethe potentialto affectair quality. Theseactivitiesare listedin the GEISand evaluatedfromthe perspective of the abilityto mitigateconsequences of activitiesthroughthe useof highefficiency particulatefilters.In addition, the releaseof anyeffluentsmustbe controlled to keepcontaminated materialwithin the NRC'sregulatory limits.For the purposesof assessing radiological impacts,impactsare of smallsignificance if dosesand releasesdo not exceedlimitsestablishedby the NRC'sregulations.

GPUNdoesnot anticipate anyactivities beyondthoselistedin the GEISthat couldpotentially affectair quality.Therefore, the impactof the TMI-2 decommissioning on air qualityis boundedby the GEIS.

5. AquaticEcology GPUNdoesnotanticipate disturbance of landsbeyondthe currentoperational areasof the plant. No alteration to the shoresof the Susquehanna Riverwill occur. All activitieswithinthe currentoperational areasof the plantwill be conductedin accordancewith requiredpermits.Therefore,the impactsof decommissioning TMI-2on aquaticecologyare boundedby the GEIS.

6. TerrestrialEcology Terrestrialecologyconsidersthe plantsand animalsin the vicinityof ThreeMib lslandas wellas the interaction of thoseorganisms witheachotherandthe environment.Evaluations of impactsto terrestrialecologyare usuallydirectedat importanthabitatsandspecies,including plantand animalsthatare important to industry,recreational activities,the areaecosystems, and those protectedby endangered speciesregulations andlegislation.GPUNdoesnotanticipate activitiesto be conductedthatwoulddisturbhabitatbeyondthe operational areas of the plant. In addition, the Pennsylvania Department of NaturalResources controlsimpactsto the environment throughregulation of construction activities.

Therefore,the impactsof decommissioning TMI-2on terrestrialecologyare boundedby the conclusions in the GEIS,whichconcludes the impactto be small.

7. Threatened and Endangered Species Of the stateor federallylistedendangered or threatened animalandplant species,onlythe baldeagle,the osprey,the peregrine falcon,andAmerican hollywereidentified to havea presenceon or nearthe island.

The baldeaglehas recentlybeenremovedfromthe endangeredspecieslist but remainsprotectedby two otherfederallaws. The Baldand GoldenEagle ProtectionAct andthe MigratoryBirdTreatyAct becameeffectivein 2007. Bald

Attachment TMt-15-093 Page19of25 eagleshavebecomerelatively commonalongthe Susquehanna Riverand have beenknownto nestin Dauphin,Lancaster, andYorkcounties.Occasionally they havebeenobservedon ThreeMilelsland,butthereare no knownnestson the island.Thereis a baldeaglenestlocatedapproximately 20 milessouth,near HoltwoodDam.

The Susquehannah Riverandthe associated environment andwetlandareasin the vicinityof ThreeMilelslandare usedby manymigratory and residentbird species.Ospreyand peregrinefalconnestsare knownto occuron ThreeMile lsland. Ospreyshavenestedon the meteorological towereveryyearsince2004.

A S5-footnestingplatformwas erectednearthe tower,but the ospreyshavenot usedit. Peregrine falconshavenestedon the TMI-1ReactorBuildingsince 2002. A nestboxdesignedfor peregrinefalconswas placedon the TMI-2 reactorbuildingin 2002,but the birdshavenot usedit. Exelonregularlymonitors the ospreyandthe peregrine falconnestson ThreeMib lsland.TheAmerican holly,state-listedas threatened,has beenrecordedon the TMI-1property.

Shouldthe situation changeandthe identified speciesroutinely be foundin or aroundany of the TMI-2buildingsor property, it is GPUN'sintentto notifythe NRCandthe Pennsylvania Department of Environmental Protectionto evaluate the impactof decommissioning activities.

8. Radiological Occupational Dose It is anticipated that low-levelradioactive wasteremovedfromTMI-2will be disposedof at approved wastedisposalsites,andthatthe disposalat local commercial landfills will be minimized in favorof low-level radioactivewaste disposalto reducethe riskof inadvertent releaseof radiological material.

Radiationdoseto the publicis expectedto remainbelowlevelscomparable to whenTMI-2was operating, throughthe continued of radiation application protectionand contamination controlscombinedwiththe reducedsourceterm availablein the facility.

It is anticipated thatan occupational doseestimatefor the decommissioning of TMI-2willbe performed prior to the startof decommissioning based activities on confirmedcharacterization resultsof areacontamination and activitylevels.

Occupational dosewill be limitedto 5 rem/yeartotaleffectivedoseequivalent (TEDE)as requiredby 10 CFR20.1201(aX1Xi), and is expectedto be administratively controlled to a lowerTEDElimitto ensurethatpersonnel doses do not exceedregulatorylimits. lt is alsoanticipated that administrativepractices will resultin equitabledistribution of doseamongavailable qualified workersto ensurecollectivedoseto the workforceis keptALARA.

Attachment TMt-15-093 Page2Qof 25 The decommissioning activitiesdosewillbe maintained withinthe regulatory limits,andas such,is consistent andwithinthe conclusions of the GEIS

9. Radiological Accidents The likelihood of a largeoffsiteradiological releasethatimpactspublichealthand safetywithTMI-2in the PDMSstateis considerably lowerthanthe likelihood of a releasefromthe plant during power operation.This is becausethe majorityof the potentialreleasesassociatedwith poweroperationare not relevantafterthe fuel has beenremovedfromthe reactor.

GEIS,Supplement 1 alsoconsiders the possibilityof a zircalloyfire. This accidentis not relevantto TMI-2in the currentPDMScondition with approximately 99o/o of the fuel materialhavingbeenremovedfromthe site and sentto INEEL.

The potentialfor decommissioning to resultin radiological activities releasesnot involvingspentfuel (thatis, releasesrelatedto decontamination and dismantlement activities)will be minimizedby use of proceduresdesignedto minimizethe likelihood and consequences of suchreleases.

Therefore, GPUNconcludes thatthe impactsof decommissioning on radiological accidents aresmalland boundedby the GEIS.

10.Occupational lssues GPUNwillcontinueto maintainappropriate administrative controlsand requirements to ensureoccupational hazardsare minimized andthatapplicable federal,stateand localoccupational safetystandardsand requirements continue to be met. GPUNhasreviewedthe occupational hazardsand injuriesin the GEISandconcluded thattheyare not uniqueor differentthanactivities performed duringconstruction and cleanupof TMI-2.Therefore, the impactof decommissioning TMI-2on occupational issuesis boundedby the GEIS.

1 1 .C o s t Decommissioning costsfor TMI-2are discussed in SectionlV of the PSDAR report.The GEISrecognizes thatan evaluation of decommissioning costis nota NationalEnvironmental PolicyAct requirement. Therefore, a boundinganalysis is notapplicable.

Attachment TMr-15-093 Page21 of 25 12.Socioeconomics Decommissioning of TMI-2is expectedto resultin positivesocioeconomic impacts.As TMI-2transitions fromthe PDMSstateto a unitundergoing decommissioning, the potentialfor localemployment to supportdecommissioning operations becomesavailable.

GPUNhasreviewedthe GEISand hasdetermined thatthe decommissioning of TMI-2is boundedby the GEISanalysisof socioeconomic effectson the shutdownanddecommissioning of an operatingunit.

13. Environmental Justice Executive Order12898,datedFebruary16, 1994,directsFederalexecutive agenciesto considerenvironmentaljustice underthe NationalEnvironmental PolicyAct. lt is designedto ensurethatlow-income and minoritypopulations do notexperience disproportionately highandadversehumanhealthor environmental effectsbecauseof federalactions.

Becausethe activitiesof the decommissioning plancreatethe potentialfor additional workopportunities, the decommissioning of TMI-2couldhavea positiveimpacton environmentaljustice by providing job opportunities for lower incomeor minoritypopulations aroundthe area.

The decommissioning activitiesare boundedby the evaluation of the post accidentcleanup activities relativeto socioeconomic andenvironmentaljustice.

GPUNconcludes thatthe employment opportunities createdby decommissioning willhavea positiveimpacton environmentaljustice andthat no furtherevaluation of detrimental impactsis required.

14.Cultural,Historic,andArcheological Resources The PEISmakesno mentionof cultural,historicor archeological resources on ThreeMilelsland.In addition,GPUNexpectsthatmostdecommissioning activitieswill be conductedwithinthe protectedareasof the site. As statedin the GEIS,wheredisturbance of landsbeyondthe operational areasis not anticipated, the impactson cultural,historicand archeological resources are not considered to be detectable or destabilizing.GPUNhasconcluded thatthe impactof decommissioning TMI-2on cultural,historic,andarcheological resources to be boundedby the GEIS.

Attachment TMt-15-093 Page22 of 25 15.Aestheticlssues The impactof decommissioning on aesthetic activities resources willbe temporary and remainconsistent withthe aesthetics of an industrial plant.After the decommissioning processis complete,site restoration activitieswill resultin structuresbeingremovedfromthe site andthe sitebeingbackfilled,gradedand landscaped as needed.The removalof structures is generally considered beneficialto the aestheticimpactof the site. Therefore, GPUNhasconcluded thatthe impactof decommissioning TMI-2on aestheticissuesis boundedby the GEIS.

16.Noise Generalnoiselevelsduringthe decommissioning processare notexpectedto be any moreseverethanduringrefuelingoutagesand are not expectedto presentan audibleintrusion on the surrounding community.Somedecommissioning activities may resultin higherthannormalnoiselevels(thatis, sometypesof demolition activities).However,thesenoiselevelswouldbe temporaryand are not expected to presentan audibleintrusion on the surrounding community.Therefore, GPUN hasconcluded thatthe impactof decommissioning TMI-2on noiseis boundedby theGEIS.

17.Transportation The GEISstatesthat NRCregulations are adequateto protectthe publicagainst unreasonable riskfromthe transportation of radioactive materialand thatthe effectsof transportation of radioactivewasteon public health and safetyare considered to be neitherdetectable nordestabilizing. The NRCanalysisfurther determined thattheirconsideration of the existingdata for decommissioning methodsandtransportation modesshouldboundthe transportation impactsfor all decommissioning optionsfor pressurized waterreactorsand boilingwater reactors.

Forthe decommissioning of TMI-2,the transportation modesassumedare shieldedcontainerremovalby railor truck. The reactorvesselinternal componentsare expectedto be transportedin spentfuel casksby rail. Other highlyradioactive wasteswill be transportedin shieldedcontainersvia truck.

The majortransportmodefor wastegeneratedfromfilteringand demineralization of the reactorcoolantsystemand the fuel transferpoolwateris assumedto requireshipmentin shieldedtruckcasks. The low levelradioactive wastes requiringcontrolleddisposalare expectedto be sentto a wasteprocessoror a low-levelradioactivewastedisposalfacilityvia raiIroad.

Attachment TMt-15-093 Page23 of 25 Thetransportation impactsof decommissioning are dependent on the numberof shipments to andfromthe plant,the typesof shipments, the distancethe materialis shipped,andthe radiologicalwaste/fixed wastequantities and disposal plans. The estimatednumberandvolumeof shipments fromthe plant willbe muchsmallerthanshipments to the plantduringdecommissioning. The shipments fromthe plant wouldbe primarily radioactive wastesand non-radioactive wastesassociatedwithdismantlement and disposalof structures, systemsandcomponents.

GPUNmustcomplywithapplicable regulations whenshippingradioactive waste, andthe NRChasconcluded in the GEISthattheseregulations are adequateto protectthe publicagainstunreasonable riskfromtransportation of radioactive materials.In addition,shipmentsof wastefromthe site are not expectedto result in measurable deterioration of affectedroadsor a destabilizing increasein traffic density.

Therefore, GPUNhasconcluded thatthe impactof decommissioning TMI-2on transportation is boundedby the GEIS.

18.lrreversible and lrretrievable Commitment of Resources lrreversiblecommitments are commitments of resourcesthat cannotbe recovered,and irretrievable commitments of resourcesare thosethat are lost for onlya periodof time.

Uraniumis a naturalresourcethat is irretrievably consumedduringpower operation.Afterthe plantis shutdownuraniumis no longerconsumed.The use of the environment (air,water,land)is notconsidered to represent a significant irreversibleor irretrievable resourcecommitment but rathera relativelyshort-term investment.Sincethe decommissioning planis to releasethe sitefor unrestricted use afterlicensetermination, landis not consideredan irreversible resource.The onlyirretrievable resources thatwouldoccurduring decommissioning wouldbe materials usedto decontaminate the facility(for example,rags,solvents, gases, andtools)andthe fuelusedfor decommissioning activitiesandtransportation of materialsto andfromthe site.

However,the use of theseresourcesis minor.

Therefore, GPUNhasconcluded thatthe impactof decommissioning TMI-2on irreversibleand irretrievable commitment of resources is boundedby the GEIS.

Attachment TMI-15-093 Page24 of 25 AdditionalConsiderations Whilenotquantitative, the followingconsiderations are alsorelevantto concluding thatdecommissioning will not resultin significant activities environmental impactsnot previously reviewed.

Significantcleanupof the TMI-2facilityhasalreadybeencompleted with approximately 99%of the fuelremovedandshippedto INEEL.

Decontamination has beencompletedto the extentthatfurthermajor decontamination programsare notjustifiedon the basisof workerdose.

Priorto decommissioning, TMI-2willbe maintained in accordance withthe NRC approvedPDMSmodegovernedby the associated PDMSTechnical Specifications, PDMSQualityAssuranceProgram,and PDMSFinalSafety AnalysisReport.As such,TMI-2willbe maintained in a conditionof stabilityand safetysuchthatthereis minimalriskto publichealthand safety.

Radiation protectiontechniques usedat the timeof decommissioning are expectedto improveovercurrentpracticesand shouldensurereductionin occupational exposure.

Siteaccesscontrolprocessesduringdecommissioning are expectedto reduce the riskof publiccontamination dueto trespassing.

Conclusion Basedon the abovediscussion, the potential environmental impactsassociated withdecommissioning TMI-2havealreadybeenpostulated in andwillbe boundedby the previously issuedenvironmental impactstatements, specifically the PEIS,andthe GEISand its supplement. Thisis principally dueto the followingreasons:

The postulatedimpactsassociatedwiththe decommissioning method chosenhavealreadybeenconsidered in the PEISandthe GEIS, includingits supplement.

Thereare no uniqueaspectsof TMI-2or of the decommissioning techniques to be utilizedthatwouldinvalidate the conclusions reached in the PEIS,andtheGEISanditssupplement.

Attachment TMI-15-093 Page25 of 25 VII. REFERENCES 1 . Pace,D. L. (GPUNuclear)to NRCletter,"Notification of Intentto Submita Post-Shutdown Decommissioning Report,"

Activities dated August14, 2012 2 . Camper,L. W. (NRC)to Pace,D. L. (GPUNuclear)letter,"ThreeMilelsland NuclearStation,Unit2 (TMl-2)- Failureto SubmitPostShutdown Decommissioning ActivitiesReport- Non-cited Violation(Docket:05000320),'

datedFebruary13,2013 3 . Masnik,M. T. (NRC)to Long,R. L. (GPUNuclear)letter,"lssuanceof AmendmentNo.45 for FacilityOperatingLicenseNo. DPR-73to Possession OnlyLicensefor ThreeMilelslandNuclearStationUnit2 (TACNo.

ML69115)," datedSeptember 14,1993 4 . NUREG-0683, Supplement 3, "Programmatic Environmental lmpact StatementRelatedto Decontamination and Disposalof Radioactive Wastes ResuftingfromMarch28, 1979AccidentThreeMilelslandNuclearStation, Unit2,"Supplement 3, datedAugust1989 5 . TLG Services,Inc.,"Decommissioning CostAnalysisfor ThreeMilelsland Unit2,"datedSeptember 2004 6 . TLG Services,Inc.,"Decommissioning CostAnalysisfor ThreeMilelsland Unit2,"datedJanuary2009 7 . Robinson, J. E. (NRC)to Gallagher, M. P. (ExelonGeneration Company, LLC)letter,"lssuance of RenewedFacilityOperating LicenseNo. DPR-50for the ThreeMilelslandNuclearStation,Unit1,"datedOctober22,2009 8 . NUREG-0586, "GenericEnvironmental lmpactStatementson Decommissioning and Radiological Criteriafor LicenseTermination,"dated August1988,and Supplement 1, Volumes1 and2, November2002 9 . TLG Services, Inc.,"Decommissioning CostAnalysisfor ThreeMilelsland Unit2,"datedDecember2014 10.TLGServices,Inc.Report,"Escalation Analysisfor ThreeMilelslandUnit2 2013Site-Specific Decommissioning CostEstimate"datedFebruary2015