TMI-13-156, Response to Request for Additional Information on Post-Shutdown Decommissioning Activities Report

Response to Request for Additional Information on Post-Shutdown Decommissioning Activities Report

ML13323A497
Person / Time
Site:	Three Mile Island
Issue date:	11/18/2013
From:	Harden P GPU Nuclear
To:	Document Control Desk, NRC/FSME
References
TMI-13-156
Download: ML13323A497 (27)

Text

CbuN U C LE A R GPUNuclear, Inc.

ThreeMilelsland NuclearStation Route441South PostOfficeBox480 Middletown.PAt 7057-0480 Tel717-948-8461 November 18,2013 TMt-13-156 1 0c F R 5 0 . 5 1 10 cFR 50.82 Attn:DocumentControlDesk U.S.NuclearRegulatory Commission Washington, D.C.20555-0001

Subject:

ThreeMilelslandNuclearStation,Unit2 DocketNo.50-320,Possession OnlyLicenseNo. DPR-73 Response to ReqqestForAdditionalInformation on Post-Shutdown Decommissionino ActivitiesReport On June28,2013(Accession No.M113190A366), GPUNuclear, Inc.(GPUN) submitteda post-shutdown decommissioning report activities (PSDAR) for Three MilelslandNuclearStation,Unit2, to the NuclearRegulatory Commission (NRC).

By letterdatedOctober21,2013(Accession No.M113266A285), the NRCstated that they havecompletedtheirreviewof the PSDAR.As a resultof this review,the NRCrequested GPUNto providean updateddecommissioning costestimatethat reflectsthe mostrecentannualupdate.Attachedis the revisedPSDAR,which incorporates this information.The revisedinformationis identifiedby a revisionbar in the rightpagemarginwitha revisionnumberadjacentto the bar.

ThreeMilelslandNuclearStation,Unit2 TMt-13-156 Page2 lf thereare any questionsor if additional is required,pleasecontact information Mr.GregoryH. Halnon,Director- FirstEnergy NuclearOperating CompanyFleet Regulatory Affairsat (330)436-1369.

Attachment:

ThreeMilelslandNuclearPowerStation,Unit2 Post-Shutdown Decommissioning ActivitiesReport,Revision1, November2013 NRCRegionI Administrator NRCSeniorResidentInspector NRCProjectManager DirectorBRP/DEP SiteBRP/DEPReoresentative

Attachment TMr-13-156 Page1 of25 ThreeMilelslandNuclear PowerStation,Unat2 Post-ShutdownDecommissioning Report Activities Revision1 November 2013

Attachment TMt-13-156 Page2 of 25 Tableof Contents SECTION PAGE I. INTRODUCTION 3 II. BACKGROUND 4 III. DESCRIPTIONOF 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 RevisionNumber RevisionDescription 0 lnitiallssue (June2013) 1 lncorporated information to updateTable1 to 2012dollars (November 2013)

Changes areon Pages1,2, 14,and1 5

Attachment TMt-13-156 Page3 of 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 ThreeMib lslandNuclearStation,Unit2 (TMl-2)in accordance withthe requirements of 10 CFR50.82,"Termination of license,"

paragraph (aX+Xi).

TMI-2hasa possession onlylicense(POL),and is currentlymaintained in accordance withthe NuclearRegulatory Commission (NRC)approvedSAFSTOR condition(methodin whicha nuclearfacilityis placedand maintained in a condition that allowsit to be safelystoredand subsequently decontaminated) knownas post-defuelingmonitored storage(PDMS).GPUNhas maintained TMI-2in the PDMS statesincethe NRCprovisions for cleanupweremetand acceptedin 1993.

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

The letterstatedthe intentto submita PSDARthatdescribes the planned decommissioning activities,schedule, costestimates, andthe environmental impacts of TMI-2plantspecificdecommissioning. By NRCletterdatedFebruary13,2013,the NRCstatedthatSeptember14, 1993is considered the dateof TMI-2'scessationof operations.

ThefollowingPSDARreportis providedin accordance withthe requirements in 10 CFR50.82.The PSDARincludes:

r A description of the planneddecommissioning activities, o A schedule for theiraccomplishment, o A site-specific decommissioning costestimateinctuding the projected costof managingirradiated fuel,and o A discussion thatprovidesthe reasonsfor concluding thatthe environmental impactsassociated withsite-specificdecommissioning activities willbe boundedby previously issuedenvironmental impact statements.

Dueto the uniquenatureof TMI-2,GPUNhasincluded a Sectionll, "Background," in the PSDARreportto provideinformation on the design,history, and currentstatusof the ThreeMilelslandNuclearStationUnit2. Sectionslll throughV addressthe 10 CFR50.82requirements to describeand providea

Attachment TMt-13-156 Page4 of 25 scheduleand costestimatefor the planneddecommissioning activities.

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

II. BACKGROUND TMI-2is locatedon the northern-most sectionof ThreeMilelslandnearthe east shoreof the Susquehanna Riverin DauphinCounty,Pennsylvania. The station is comprised of two pressurized waterreactors. The TMI Nuclear Station includesthe operatingUnit1, ownedby ExelonGeneration Company,LLC (Exelon),andthe shutdown Unit2 ownedby GPUN.

TMI-2is a non-operational pressurizedwaterreactorthatwas ratedat a core thermal power levelof 2772megawatt-thermal witha 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, verticalcylinderwitha hemispherical domeand a flat,reinforced concrete basemat.A weldedsteellinerplate,anchoredto the insidefaceof the reactor building,servesas a leak-tight membrane.

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

The lackof secondaryfeedwaterresultedin the reductionof primary-to-secondaryheatexchangethatcausedan increasein the reactorcoolant temperature, creatinga surgeintothe pressurizer, andan increasein system pressure.The pressureoperatedreliefvalve(PORV)openedto relievethe pressure,butfailedto closewhenthe pressuredecreased.The reactorcoolant pumpswereturnedoff anda coreheat-upbeganas the reactorcoolantsystem waterinventory continued to decreaseresultingin a reactorvesselwaterlevel belowthe top of the core. Thisledto a coreheatup thatcausedfueldamage.

The majorityof the fuelmaterialtravelleddownthroughthe regionof the southeastern assemblies and intothe corebypassregion.A portionof thefuel materialpassedaroundthe bypassregionand migrateddownintothe lower internalsand lowerheadregion,butoverallreactorvesselintegrity was maintained throughout the accident.

Attachment TMI-13-156 Page5 of 25 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 waterprocessing cleanupactivities.

The quantityof fuel remaining at TMI-2is a smallfractionof the initialfuel load; approximately 99 percent (%) wassuccessfully 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 lmpactStatementRelatedto Decontamination and Disposalof Radioactive WastesResulting fromthe March28, 1979Accident ThreeMilelslandNuclearStation,Unit2,"Supplement 3 (PEIS)discusses performed the activities to achievethe PDMSstateat TMI-2.

The PEISevaluates the activities associated withthe post-accident cleanupfor environmental impact,and addresses the significant amountof decontamination andwasteremovalthatwouldnormallybe partof a decommissioning plan,which werecompleted to 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 extentpractical to reduceradiationlevelsto as lowas is reasonably achievable (ALARA).As partof the decontamination effort,water was removedto the extentpracticalfrom the reactorcoolantsystemandthe fuel transfercanal,andthe fueltransfertubeswereisolated.Radioactive wastes fromthe majorclean-upactivities havebeenshippedoff-siteor has been packagedand stagedfor shipmentoff-site.

Following the decontamination onlythe reactorbuildingand a few activities, areasin the auxiliaryandfuel handlingbuildings continued to havegeneralarea radiationlevelshigherthanthoseof an undamaged reactorfacilitynearingthe end of its operatinglife.

GPUNmaintained TMI-2in the PDMSstatewhilesuccessfully operating TMI-1 untilAmerGen(a jointventurebetweenPhiladelphia EnergyCompanyand British Energy)purchased theoperating TMI-1fromGPUNin 1998.Thesaleof TMI-1 includedthe Unit1 buildings, structures,andthe majorityof the siteproperty; howeverGPUNmaintained ownership of TMI-2.A monitoring agreement between AmerGenand GPUNprovidesfor AmerGenperforming certainfunctionsat TMI-2

Attachment TMt-13-156 Page6 of 25 whileTMI-2is in PDMSon the behalfof GPUN.Thesefunctions include maintenance andtesting,radiological andenvironmental controls,securityand safetyfunctionsand licensingactivities requiredby the PDMSTechnical Specifications and PDMSFinalSafetyAnalysisReport.

FirstEnergy acquiredGPUNandownership of TMI-2in 2001as partof a larger acquisitionof GPU,and continued the monitoring agreement withAmerGen.In December 2003,Exelonacquiredsoleownership of TMI-1. A2004site-specific costestimatefor decommissioning TMI-2assumeda delayedDECONscenario, whichdeferredthe decontamination anddismantling activitiesat TMI-2untilthey are synchronized withTMI-1suchthatthe licensesfor bothunitsareterminated concurrently. Thisscenarioassumeda 1O-year dormancyperiodfor TMI-2, folfowingthe TMI-1originallicenseexpiration in 2014,withdecommissioning preparation to beginin about2024.The initialscheduleassumed decommissioning operations wouldbeginin about2026,andwouldbe completed overa 1O-year periodwithsiterestoration projectedin 2036. Sincethattimean extension to the TMI-1operatinglicensehasbeengrantedwarranting a revisionto the decommissioning schedule for TMI-2.

The NRCapproveda2}-yearextension to the TMI-1OperatingLicenseby letterto ExelondatedOctober22,2009. As a result,the TMI-1OperatingLicensehasbeen extendeduntilApril 19,2034.TheTMI-2PSDARestablishes the schedulefor the decommissioning of TMI-2to commence followingthe expiration of the TMI-1 OperatingLicenseon April 19,2034.

III. DESCRIPTION OF DECOMMISSIONING ACTIVITIES The objectiveof decommissioning TMI-2is to safelyperformall the activities associated withdecontamination anddismantlement of the remaining plant systems,components, structures,andfacilitiesin a costeffectivemanner.The decommissioning planassumesthatTMI-2is effectively maintained in the currentSAFSTORmodeof PDMSuntilthe expiration of the TMI-1operating licensein2034,whichcouldextendthroughthe periodof spentfuelremovaland storagefromTMI-1.The decontamination anddismantling activities at TMI-2will thenbe synchronized withthe adjacentunitsuchthatthe licensesfor bothunits are terminated concurrently.

The decommissioning planfor TMI-2involvesactivities to addressthe higher sourcetermmaterials to eliminateelementsthatwouldcontribute to higher workerexposureduringactivities thataretypicalof decommissioning an operatingplantat the end of plantlife.

Attachment TMt-13-156 Page7 of 25 The decommissioning willfocuson the useof bothultrahighpressurewater spraysand mechanical decontamination methodsfor the removalof the remaininghighsourcetermmaterials.Sincethe majorityof the spentfuel has alreadybeenremovedfrom site andtransferredto a DOEfacility,thereis no needto constructan independent spentfuelstorageinstallation (lSFSl)specific to TMI-2. GPUNwillexploretwo optionsfor storageandtransferof the remainingresidualfuelandgreaterthanclassC (GTCC)waste. First,GPUNwill workwiththe DOEto obtainauthorization to transportthe remaining fueland GTCCwasteto INEEL,wherethe majorityof TMI-2spentfuel is currentlystored, or to an alternatestorageor repository locationdesignated by DOE,if available, by thattime. lf DOEstorageoptionsare notdeemedviable,GPUNwillexplore an agreement with Exelonto havethe remaining TMI-2fueland GTCCstoredin the TMI-1ISFSIuntila DOEgeological repositorybecomesoperational.

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

o PDMS(SAFSTORDormancy)

. Preparationsfor Decommissioning o DecommissioningOperations o Non-radiological Restoration of the Site Thefollowingprovidesa discussion of the decommissioning plan,the significant andthe generalsequencing activities, of activities in eachof the aboveperiods.

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

Period1: PDMS(SAFSTORDormancy)

The PDMScondition was establishedfollowingthe accidentat TMI-2to establish an inherently stableandsafeconditionof the facilitysuchthattherewas no risk to the publichealthandsafety.The PDMSstatehasbeenapprovedby the NRC and is governedby a PDMSSafetyAnalysisReport,PDMSTechnical Specifications,and PDMSQualityProgram.

The PDMSTechnicalSpecification requirements to monitorandsuruey radiologicalconditionshavebeenestablished and maintained since1993. Site securityis maintainedas a contractedserviceby Exelon that owns and operates TMt-1.

Attachment TMt-13-156 Page8 of 25 As discussedin the TMI-2PDMSSafetyAnalysisReport:

o Thereis no crediblepossibility of nuclearcriticality.

. Fueland coredebrisremovedfromthe reactorvesseland associated systemshas beenshippedoffsite.

. Any potentialforsignificant releaseof radioactivity has been eliminated.

o Waterhas beenremovedto the extentpracticalfromthe reactor coolantsystemandfueltransfercanal,andfueltransfertubeshave beenisolated.Thetreatmentand processing of accidentgenerated waterhasbeencompleted.

o Radioactive wastefromthe majorcleanupactivities has beenshipped off-siteor has beenpackagedfor shipmentoff-site.

o Radiation withinthe facilityhasbeenreduced,as necessary, consistent withALAM principles to levelsthatwillallownecessary plantmonitoring activities,the performance of requiredmaintenance, and any necessary inspections.

The PDMSdormancyperiodis expectedto extenduntilthe end of TMI-1 operatinglicensein 2034,andcouldextenduntilcompletion of the TMI-1spent fuel removalandstoragecampaign.In the eventthatcircumstances dictatean earliershutdownof TMI-1,the expectedTMI-2PDMSdormancy period willbe reduced,andthe PSDARwill be revisedto reflecta decommissioning schedule thatmaintains concurrent decommissioning withTMI-1.

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

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

Attachment TMt-13-156 PageI of 25 In preparationfor actualdecommissioning, activitiesthatwill be performed include:

o Conducta characterization of the siteandthe surrounding environs.

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

. Conductradiationsurveysof the auxiliaryandfuel handlingbuiHings withemphasison areaswithknownand potentialalphacontamination, and knownfissionproducts.

. Conductradiation surveysandsampleanalysison exteriorbuildings, landareassurrounding the facility,subsurface soilandgroundwater.

o Developspecifications for transportand requirements for highly radioactivewasteandhazardouswaste.

o Developprocedures for occupational exposurecontrol,controland handlingof liquidandgaseouseffluents, processing of radioactive waste,sitesecurity,emergency programs, and industrial safety.

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

Someof the activitiesare uniqueto the decommissioning of TMI-2,but a number of theseactivitiesmay be coordinated with Exelonas they may be neededto supportthe concurrent decommissioning of TMI-1.

o Construction of temporary facilitiesor modifications to existingfacilities to supportdismantlement activities.

. Designandfabrication of temporary and permanent shielding to supportremovalandtransportation construction activities, of contamination controlenvelopes, andthe procurement of specialty tooling.

o Procurement of shippingcontainers, caskliners,and industrial packagesfor packaging.

Attachment TMt-13-156 Page10of25 Reconfiguration and modification of site structuresand facilitiesas neededto supportdecommissioning operations.Thismay includethe upgrading of roadsand railfacilities to facilitatehaulingandtransport.

Decontamination of components andstructures as requiredto reduce sourcetermandcontrol(minimize) workerexposure.

Inventory, decontamination, and removalof legacyequipment inventoryleftoverfromdefuelingcampaign.

Disassembly and segmentation of the remaining reactorvessel internals.Someinternals are expectedto exceedGTCCrequirements.

As such,the segmentswill be appropriately packagedfor disposal.

Removalof controlroddrivehousingsandthe headservice structurefrom reactorvesselhead.

Segmentation of the reactorvesselhead.

Segmentation of the reactorvessel.

Removalof the steamgeneratorsand pressurizer for material recoveryand controlled disposal.

Removalof the free standingconcreteand otherinternalstructuresin the reactorbuilding including:polarcrane,biological shield,D-rings, floors.etc.

A licensetermination plan(LTP),in accordance with10 CFR50.82(aXg), willbe preparedat leasttwo yearspriorto the anticipated dateof licensetermination.

The LTPwill includea sitecharacterization, description of remaining dismantling plansfor siteremediation, activities, updatedcostestimateto completethe decommissioning, anyassociated environmental concerns, designation of the end useof the site,andthe procedures for the finalradiation survey.The LTP willbe developed following theguidance contained in Regulatory Guide1.179, "StandardFormatandContentof LicenseTermination Plansfor NuclearPower Reactors."As describedin Regulatory Guide1.179,the LTPwill usethe guidancecontainedin NUREG-1575, "Multi-Agency Radiation Surveyand Site lnvestigationManual(MARSSIM)" to developthe finalradiological surveyplan and surveymethods.The useof MARSSIMto developthe finalradiological surveyplanandsurveymethodswilldemonstrate compliance withthe requirements 10 CFR20, SubpartE, "Radiological Criteriafor License Termination." is Oncethe LTP approved, the final remediation of the site

Attachment TMt-13-156 Page11 of25 facilitiesandservicescan commence.Theseactivities include,but are not limitedto:

Removalof remaining plantsystemsandcomponents as theybecome nonessential to the decommissioning program,or workerhealthand safety(forexample,wastecollection and processing systems, electricalpowerandventilation systems).

Removalof contaminated yardpipingandanycontaminated soil.

Remediation and removalof the contaminated equipment and material fromthe auxiliaryandfuelbuibings,and anyothercontaminated facility.

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

Period4 - Site Restoration Following completion of decommissioning operations, siterestoration activities willbegin. Siterestoration willinvolvethe dismantling anddisposalof any remaining non-radiological structures.Restoredareasof the sitewill be backfilled, gradedand landscaped to supportvegetation for erosioncontrol.

IV. SCHEDULE OF DECOMMISSIONING ACTIVITIES The decommissioning planfor TMI-2can be characterized as a delayedDECON approach.The schedulefor decommissioning of TMI-2 is based on the assumption thatTMI-2will be decommissioned withTMI-1to achieveeconomies of scale,by sharingcostsbetweenunits,andcoordinating the sequenceof work activities.

The highlevelschedulefor decommissioning of TMI-2assumesthatthe PDMS SAFSTORdormancyperiodwillextendpastthe TMI-1shutdowndateto allow for TMI-1ISFSIconstruction andspentfuelremovalandstorage.Priorto completion of the TMI-1ISFSIprogram,the preparation for TMI-2 decommissioning willbegin.As decommissioning approaches, schedule variations to accountfor availability of wastedisposalfacilitiesand coordination

Attachment TMt-13-156 Page12of25 withExelonandvendorswill be incorporated. lt is notexpectedthatthese variations will impactthe overallcompletion schedule.

The schedulefor decommissioning of TMI-2has beendevelopedin orderto achievethe termination of licenseby September14,2053.Thistermination date ensurescompliance withthe NRCrequirement to completedecommissioning 60 yearsfrom certificateof cessationto operateas definedin 10 CFR 50.82(aX3).

In the eventof any unforeseen circumstances thatshouldwarranta requestthat TMI-2licensetermination be allowedbeyondSeptember14,2053,GPUNwill notifythe 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 determined to be the NRC'sissuanceof TMI-2 LicenseAmendment 45, converting the TMI-2operatinglicenseto a possession onlylicense.Thisamendment wasgrantedon September 14,1993and establishes thatdateas the datethatTMI-2is considered to havesubmitted certification of permanent cessation of operations.Uponreceiptof NRC termination of license,siterestoration activities willcommence.lt is estimated that the site restorationwill take approximately one yearto completethereby rendering the ThreeMilelslandsiterestoredto greenfield statusin 2054.

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

MAJORDECOMMISSION INGACTIVITY DATES TMI-2PDMSSAFSTORDormancy 1993- 2043 TMI-1Shutdown April19,2034 TMI-2Decommissioning Preparation 2043-2044 TMl-2 Decommissioning Operations 2044-2053 TMI-2SiteRestoration 2053- 2054 V. ESTIMATED COSTSOF DECOMMISSIONING ACTIVITIES In February1996,TLG Services,Inc.completed the firstTMI-2site-specific decommissioning costestimatethatwas developed for GPUN.Thatanalysis was first updatedin 2004and has beenfurtherrefinedto reflectcurrent assumptions pertainingto disposition of the nuclearunitand relevantindustry experience in undertaking decommissioning projects.

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

Attachment TMI-13-156 Page13of25 lowand highlevelradioactive wastedisposalsites,andsiteremediation requirements. The methodology usedto developthe costestimatefollowsthe basic approachdevelopedby the AtomicIndustrial Forum(nowthe NuclearEnergy Institute)in AIF/NESP-036, "Guidelinesfor Producing Commercial NuclearPower PlantDecommissioning CostEstimates." The methodusesa unitcostfactor approach,including applicationof workdifficulty adjustment factorsto develop decommissioning activitycosts,and incorporates localinformationrelatedto labor rates,as wellas latestavailableindustryexperience.The unitfactormethod providesa demonstrable basisfor establishing reliablecostestimates.Thedetail providedin the unitfactors,including activityduration,laborcosts(bycraft),and equipment and consumable costs,ensuresthatessentialelementshavenot been omitted.

The estimatepresentedhereinis baseduponthe mostrecentupdateto the site specificcostestimatecompletedby TLG Servicesin January2009,and provided to the NRCas partof the 10 CFR50.75(0(1), "Reporting and recordkeepingfor decornmissioning planning," submittalon March29,2010(Accession No.ML100960464).

Consistent witha signedmemorandum of understanding betweenFirstEnergy Corp.(parentof GPUN)and Exelonregarding the timingof decommissioning activitiesat TMI-2,it is assumedthatdecommissioning at TMI-2will not beginuntil the expiration of the TMI-1operatinglicensein 2034andwill be coordinated with post-shutdown activitiesfor TMI-1. Forthe purposeof thiscostestimatethe integration of sitesecurityandthe finalsiteradiological surveybetweenthe two unitsis assumed.

Therearea numberof considerations thataffectthe methodfor decommissioning the TMI-2siteandthe degreeof restoration required.The costestimateincludes the considerations identified below.

The majorityof the fuelwas removedduringthe TMI-2CleanupProgram's reactorvesseldefuelingeffortthatconcluded in January1990.Titleto thisfuel was transferred to the Department of Energy (DOE). The remainder of the fuel (about1%)is dispersed withinthe primarysystemandto a lesserextentin other systemsandstructures.Thisresidualmaterialwillbe removedas radioactive waste. Therefore,the costof managingirradiatedfuel is not reflectedwithinthe estimates to decommission the TMI-2site.

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

Attachment TMt-13-156 Page14of25 waste,the DOEhasindicated theywillacceptthiswastefor disposalat the future high-level wasterepository.However, the DOEhasnotdeveloped an acceptance criteriaor disposition schedulefor thismaterial,and numerous questionsremainas to the ultimatedisposalcostandwasteformrequirements.

Forpurposesof the costestimate,it is assumedthatGTCCwastewill be packagedanddisposedof as high-level waste,at a costof $25,000per cubic foot (in 2008dollars).lt is alsoassumedthatthe DOEwillacceptthe GTCC materialin a timelymannerso as notto affectthe TMI-2decommissioning schedule.No additional costsare includedfor the temporary storageof GTCC material.

The decommissioning costestimatefor TMI-2has beensummarized in Table1.

The valuesfor the tablecamefromthe sitespecificcostestimatecompletedby TLG Servicesin January2009. Thevaluesin the estimatewerepresented in 2008dollars.Thesevalueswereescalated to 2012dollarsby usingan escafation factorof 2.81percentl.

ThisPSDARwill not be 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(aX8Xv). Thisreportwillinclude , at a minimum, the assumptions usedin the ratesof escalation of 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 significantschedulechangefromthoseactionsand schedules describedin the PSDAR,including changesthatsignificantly increasethe decommissioning cost.

GPUNwillalsoincludean updatedsitespecificestimateof remaining decommissioning costsin the licensetermination planin accordance with 10 CFR 50.82(a)(9XiiXF). The annual10 CFR50.75(fX1) reportscontinueto demonstrate thatthe currentfundbalancesare morethanadequateto coverthe expected futurecostof decommissioning. In the eventthatfutureestimated costsor funding levelschangesignificantly, GPUNwill makethe necessary adjustments to ensure thatsufficientfundsremainavailable for decommissioning.

t Table1 of TLG Services,Inc.Report,"Financial EscalationAnalysisfor the Decommissioning of ThreeMilelsland,Unit2,"datedMay2009

Attachment TMt-13-156 Page15of25 TABLE1 TMI-2DECOMMISSIONING COST

SUMMARY

1 (Thousands basedon 2012dollars)

Decontamination $ 35,279 Removal $ 167,051 Packaging $ 19,252 Transportation,Off-siteWaste Processing, and Disposal $ 228,125 ProgramManagement $ 415,198 Miscellaneous Equipment $ 25,885 lnsuranceand RegulatoryFees $ 19,963 OtherDecommissioninqCosts $ 33.175 Total DecommissioningCosts $ 943,927 Note1 - Columndoesnotadddueto mathematical roundingperformedduringthe development of thecalculation VI. ENVIRONMENTAL IMPACTS OF DECOMMISSIONING ACTIVITIES 10 CFR 50.82(4()(i)requiresthatthe PSDARinclude"a discussion thatprovides the reasons for concluding thatthe environmental impacts associated withthe site-specificdecommissioning activitieswillbe boundedby appropriate previously issued environmental impactstatements ..." The potentialenvironmental impacts associated withthe proposeddecommissioning for TMI-2werecompared activities withsimilarimpactsgivenin the PEISrelatedto post-accident cleanupactivities resulting fromthe March28,1979accident;andwith NUREG-0586, "Generic Environmental lmpactStatement on Decommissioning of NuclearPower Facilities,"datedAugust1988andSupplement 1,Volumes1 and2, dated November2OOZ (collectively knownas GEIS)on decommissioning and radiological criteriafor licensetermination.Thefollowingdiscussion provides the comparison.

PEIS The PEISidentified thatthe post-accident cleanupactivitiescan be categorized intofourfundamental activities:

1 . Building andequipment decontamination, 2 . Fuelremovalandthe reactorcoolantsystemdecontamination, 3 . Treatmentof radioactive liquids,and 4 . Packaging, handling, shipment, anddisposalof radioactive wastes

Attachment TMt-13-156 Page16of25 Theseactivities wereusedin the evaluation of the alternativesto GPUN's proposedactionof delayeddecommissioning. As describedin the PEIS,the NRCevaluatedsevenalternatives relativeto delayeddecommissioning. The NRCconcluded (exceptfor the no actionalternative, whichwas not considered acceptable) thatno alternative wasfoundto be superiorto GPUN'sproposal froman environmental impactperspective.

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

. The activities to be performed for decommissioning areequivalent to the activities performed duringthe post-accident cleanupevaluatedin the PEIS,

. The radiationcontroltechniques anddecontamination methodssince the postTMI-2accidentcleanuphaveimproved, o No site-specific activitiespertaining to TMI-2decommissioning would alterthe conclusions of the PEIS,

. Radiation doseto the publicwillbe minimal, and o Radiation doseto decommissioning workerswill be maintained ALAM according to 10 CFRPart20.

As notedin the PEIS,the outcomeof completing the clean-upactivities at TMI-2 wouldresultin manyareasdecontaminated to the pointwheregeneralareadose ratesapproximate thosein an undamaged reactorfacilitynearingthe end of its operatinglife.

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

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

Attachment TMt-13-156 Page17of25 Decommissioning activities are identified in AppendixE of NUREG-0586, Supplement 1. No activities plannedfor TMI-2deviatefromthe activities listedin termsof environmental impact.A deviation existsin termsof the variables associated withtransuranic fueland highersourceterms. However, these variablesare addressed throughcontrolled decontamination anddismantlement, andfollowingNRCregulations associated withdose. So longas decontamination anddismantlement are performed withinthe guidelines of the regulations regarding releaseof effluents, occupational dose,andoffsitedose; and GTCCwasteis containedin approvedshippingcontainers; the decommissioning activities at TMI-2are directlycomparable to the activities evaluated in the GEIS.

NUREG-0586, Supplement 1, Section4.3,"Environmental lmpactsfrom Nuclear 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,structuredismantlement, and lowlevelwastepackaging and storage.

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

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

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

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

Attachment TMr-13-156 Page18of25

4. Air Quality Thereare manytypesof decommissioning that havethe potentialto activities affectair quality.Theseactivities are listedin the GEISandevaluated fromthe perspective of the abilityto mitigateconsequences of activitiesthroughthe useof highefficiency particulate filters.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 notexceedlimitsestablished by the NRC'sregulations.

GPUNdoesnotanticipate anyactivities beyondthoselistedin the GEISthat couldpotentially affectair quality. Therefore, the impactof the TMI-2 decommissioning on airqualityis boundedby the GEIS.

5. AquaticEcology GPUNdoesnotanticipate disturbance of landsbeyondthe currentoperational areasof the plant. No alteration to the shoresof the Susquehanna Riverwill occur.All activities withinthe currentoperational areasof the plant willbe conductedin accordance withrequiredpermits.Therefore, the impactsof decommissioning TMI-2on aquaticecologyare boundedby the GEIS.

6. TerrestrialEcology Terrestrial ecologyconsiders the plantsandanimalsin the vicinityof ThreeMile lslandas wellas the interaction of thoseorganisms witheachotherandthe environment.Evaluations of impactsto terrestrial ecologyare usuallydirectedat importanthabitatsandspecies,including plantand animalsthatare important to industry,recreational activities,the areaecosystems, and thoseprotectedby endangered speciesregulations and legislation.GPUNdoesnotanticipate activitiesto be conducted thatwoulddisturbhabitatbeyondthe 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 terrestrial ecologyare boundedby the conclusions in the GEIS,whichconcludes the impactto be small.

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

The baldeaglehas recentlybeenremovedfromthe endangered specieslistbut remainsprotectedby two otherfederallaws. The Baldand GoldenEagle ProtectionAct and the MigratoryBirdTreatyAct becameeffectivein 2007. Bald

Attachment TMt-13-156 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 peregrine falconnestsare knownto occuron ThreeMile lsfand. Ospreyshavenestedon the meteorological towereveryyearsince2004.

A 55-footnestingplatformwas erectednearthe tower,but the ospreyshavenot usedit. Peregrine falconshavenestedon the TMI-1ReactorBuildingsince 2002. A nestboxdesignedfor peregrine falconswas placedon the TMI-2 reactorbuildingin 2002,butthe birdshavenot usedit. Exelonregularlymonitors the ospreyandthe peregrine falconnestson ThreeMilelsland.TheAmerican holly,state-listed as threatened, hasbeenrecordedon the TMI-1property.

Shouldthe situationchangeandthe identified speciesroutinelybe foundin or aroundanyof the TMI-2buildingsor property, it is GPUN'sintentto notifythe NRCandthe Pennsylvania Department of Environmental Protection to evaluate the impactof decommissioning activities.

8. Radiological Occupational Dose It is anticipatedthat low-levelradioactive wasteremovedfromTMI-2will be disposedof at approvedwastedisposalsites,andthatthe disposalat local commercial landfillswill be minimized in favorof low-levelradioactive waste disposalto reducethe riskof inadvertent releaseof radiologicalmaterial.

Radiation doseto the publicis expectedto remainbelowlevelscomparable to whenTMI-2was operating, throughthe continued of radiation application protection and contamination controlscombinedwiththe reducedsourceterm availablein the facility.

It is anticipatedthatan occupational doseestimatefor the decommissioning of TMI-2willbe performed priorto the startof decommissioning activitiesbasedon confirmedcharacterization resultsof areacontamination and activitylevels.

Occupational dosewill be limitedto 5 rem/yeartotaleffectivedoseequivalent (TEDE)as requiredby 10 CFR20.1201(a)(1)(i), and is expectedto be administratively controlled to a lowerTEDElimitto ensurethatpersonnel doses do notexceedregulatory limits.lt is alsoanticipated thatadministrative practices will resultin equitabledistribution of doseamongavailable qualifiedworkers to ensurecollectivedoseto the workforceis keptALARA.

Attachment TMt-13-156 Page20 of 25 The decommissioning activitiesdosewillbe maintained withinthe regulatory limits,and as such,is consistent andwithinthe conclusions of the GEIS

9. Radiological Accidents The likelihood of a largeoffsiteradiological releasethat impactspublichealthand safetywithTMI-2in the PDMSstateis considerably lowerthanthe likelihood of a releasefromthe plantduringpoweroperation.Thisis becausethe majorityof the potentialreleasesassociatedwith poweroperationare not relevantafterthe fuel has beenremovedfromthe reactor.

GEIS,Supplement 1 alsoconsiders the possibility of a zircalloyfire. This accidentis not relevantto TMI-2in the currentPDMSconditionwith approximately 99%of the fuelmaterialhavingbeenremovedfromthe siteand sentto INEEL.

The potentialfordecommissioning to resultin radiological activities releasesnot involving spentfuel (thatis, releasesrelatedto decontamination and dismantlement activities)will be minimized by useof procedures designedto minimizethe likelihood and consequences of suchreleases.

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

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

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

Attachment TMr-13-156 Page21 of 25 12.Socioeconomics Decommissioning of TMI-2is expectedto resultin positivesocioeconomic impacts.As TMI-2transitions fromthe PDMSstateto a unitundergoing decommissioning, the potential for localemployment to supportdecommissioning operations becomesavailable.

GPUNhas reviewedthe 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 activities of the decommissioning plancreatethe potential for additional workopportunities, the decommissioning of TMI-2couldhavea positiveimpacton environmentaljustice by providing job opportunities for lower incomeor minoritypopulations aroundthe area.

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

GPUNconcludes thatthe employment opportunitiescreatedby decommissioning will havea 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-13-156 Page22 of 25 15.Aestheticlssues The impactof decommissioning activitieson aestheticresources will be temporaryand remainconsistent withthe aesthetics plant.After of an industrial the decommissioning processis complete, siterestoration will resultin activities structures beingremovedfromthe siteandthe sitebeingbackfilled, gradedand landscaped as needed.The removalof structures is generallyconsidered beneficial to 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 audibleintrusionon the surrounding community.Somedecommissioning activities mayresultin 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 GEISstatesthatNRCregulations are adequateto protectthe publicagainst unreasonable riskfromthe transportation of radioactive materialandthatthe effectsof transportation of radioactivewasteon publichealthand safetyare considered to be neitherdetectable nordestabilizing. The NRCanalysisfurther determined thattheirconsideration of the existingdatafor 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 components are expectedto be transported in spentfuelcasksby rail. Other highlyradioactive wasteswillbe transported in shieldedcontainers via truck.

The majortransportmodefor wastegenerated fromfilteringanddemineralization of the reactorcoolantsystemand the fuel transferpoolwateris assumedto requireshipmentin shieldedtruckcasks.The low levelradioactive wastes requiringcontrolled disposalare expectedto be sentto a waste processor or a low-levelradioactive wastedisposalfacilityvia railroad.

Attachment TMt-13-156 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 disposalplans.The estimatednumberandvolumeof shipments fromthe plant will be muchsmallerthanshipments to the plantduringdecommissioning. The shipments fromthe plantwouldbe primarilyradioactive wastesand non-radioactive wastesassociated withdismantlement anddisposalof structures, systemsand components.

GPUNmustcomplywithapplicable regulations whenshippingradioactive waste, andthe NRChasconcludedin the GEISthattheseregulations are adequateto protectthe publicagainstunreasonable riskfromtransportation of radioactive materials.In addition,shipments of wastefromthe siteare notexpectedto result in measurable deteriorationof affectedroadsor a destabilizing increasein traffic density.

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

18. lrreversible and lrretrievableCommitment of Resources lrreversiblecommitments are commitments of resources thatcannotbe recovered,and irretrievable commitments of resourcesare thosethat are lost for onlya periodof time.

Uraniumis a naturalresourcethatis irretrievably consumedduringpower operation.Afterthe plantis shutdownuraniumis no longerconsumed.The use of the environment (air,water,land)is notconsidered to represent a significant irreversibleor irretrievableresourcecommitmentbut rathera relativelyshort-term investment.Sincethe decommissioning planis to releasethe sitefor unrestricted useafterlicensetermination, landis notconsidered an irreversible resource.The onlyirretrievable resources thatwouldoccurduring decommissioning wouldbe materialsusedto decontaminate the facility(for example,rags,solvents,gases,andtools)andthe fuel usedfor decommissioning activitiesandtransportation of materials to andfromthe site.

However, the useof theseresources is minor.

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

Attachment TMt-13-156 Page24 of 25 Additional Considerations Whilenotquantitative, the followingconsiderations are alsorelevantto concluding thatdecommissioning activitieswill not resultin significant environmental impactsnot previously reviewed.

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

Decontamination hasbeencompleted to the extentthatfurthermajor decontamination programsare not justifiedon 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 publichealthandsafety.

Radiation protectiontechniques usedat the timeof decommissioning are expectedto improveovercurrentpractices andshouldensurereductionin occupational exposure.

Siteaccesscontrolprocesses duringdecommissioning are expectedto reduce the riskof public contamination dueto trespassing.

Conclusion Basedon the abovediscussion, the potentialenvironmental impactsassociated withdecommissioning TMI-2havealreadybeenpostulated in andwillbe boundedby the previously issuedenvironmental impact statements, specifically the PEIS,andthe GEISanditssupplement. Thisis principally dueto the followingreasons:

. The postulated impactsassociated withthe decommissioning method chosenhavealreadybeenconsidered in the PEISandthe GEIS, includingitssupplement.

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

Attachment TMt-13-156 Page25 of 25 VII. REFERENCES

1. Pace,D. L. (GPUNuclear)to NRCletter,"Notification of Intentto Submita Post-Shutdown Decommissioning ActivitiesReport,"datedAugust14, 2012

2. Camper,L. W. (NRC)to Pace,D. L. (GPUNuclear)letter,"ThreeMilelsland NuclearStation,Unit2 (TMl-2)- Failureto SubmitPost-Shutdown 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 ThreeMib lslandNuclearStationUnit2 (TACNo.

ML69115),"datedSeptember 14,1993

4. NUREG-0683, Supplement 3, "Programmatic Environmental lmpact StatementRelatedto Decontamination and Disposalof Radioactive Wastes ResultingfromMarch28, 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,"lssuanceof RenewedFacilityOperatingLicenseNo. DPR-50for theThreeMilelslandNuclearStation,Unit1,"datedOctober22,2009

8. NUREG-0586, "GenericEnvironmental lmpactStatements on Decommissioning and Radiological Criteriafor LicenseTermination," dated August1988,and Supplement 1,Volumes1 and2, November2002