ML13357A205

of the Maine Yankee Atomic Power Station Post-Shutdown Decommissioning Activities Report

ML13357A205
Person / Time
Site:	Maine Yankee
Issue date:	12/12/2013
From:	Connell J M Maine Yankee Atomic Power Co
To:	Document Control Desk, Office of Nuclear Material Safety and Safeguards
References
OMY-13-065
Download: ML13357A205 (18)

Text

Maine Yankee321 OLD FERRY RD

• WISCASSET, ME 04578-4922 December 12, 2013OMY-13-065 10 CFR 50.82(a)(7) 10 CFR 50.4ATTN: Document Control DeskU.S. Nuclear Regulatory Commission Washington, DC 20555 -0001Maine Yankee Atomic Power CompanyMaine Yankee Independent Spent Fuel Storage Installation NRC License No. DPR-36 (NRC Docket Nos. 50-309 and 72-30)

Subject:

Revision 2 of the Maine Yankee Atomic Power Station Post-Shutdown Decommissioning Activities ReportPursuant to the requirements of 10 CFR 50.82(a)(7)

Maine Yankee Atomic Power Companyprovides Revision 2 to the Maine Yankee Atomic Power Station Post-Shutdown Decommissioning Activities Report (PSDAR) (Enclosure 1). Attachment 1 provides a summaryand rationale for the changes.

Enclosure I is a complete copy of the Maine Yankee AtomicPower Station PSDAR.This letter contains no commitments.

If you have any questions regarding this submittal, please contact me at (207) 882-1303 orjconnell@3yankees.com.

James M. ConnellVice President and ISFSI ManagerAttachments and Enclosures Attachment 1 -Summary of Proposed Changes to the Maine Yankee Atomic Power Station Post-Shutdown Decommissioning Activities ReportEnclosure I -Maine Yankee Atomic Power Station Post-Shutdown Decommissioning Activities Report, Revision 2 -December 2013cc: W. M. Dean, NRC Region I Administrator J. Goshen, NRC Project ManagerP. Dostie, Maine State Nuclear Safety Inspector ATTACHMENT 1 TO OMY-13-065 SUMMARY OF CHANGES TO THE MAINE YANKEE ATOMIC POWER STATIONPOST-SHUTDOWN DECOMMISSIONING ACTIVITIES REPORT ATTACHMENT 1 TO OMY-13-065 SUMMARY OF CHANGES TO THE MAINE YANKEE ATOMIC POWER STATIONPOST-SHUTDOWN DECOMMISSIONING ACTIVITIES REPORTSection Proposed Change Reason for ChangeI, II, III, IV, Updated to reflect that the On July 30, 2002 and September 30, 2005, theVI, VII decommissioning of the Maine Yankee NRC issued Amendment Nos. 167 and 172,Nuclear Plant is complete, with the respectively, to Facility Operating License No.exception of the Maine Yankee DPR-36 for the Maine Yankee Atomic PowerIndependent Spent Fuel Storage Station that resulted in the release of all of theInstallation (ISFSI) and the applicable land from the Maine Yankee 10 CFR 50License, land areas. with the exception of the land where the ISFSI islocated and an adjacent parcel of land. The totalarea that remains under the control of the10 CFR 50 License is approximately 12 acres.Thus, the decommissioning of the MaineYankee plant is complete.

The only remaining decommissioning activities are those associated with the ISFSI and applicable areas.II, III, IV, Updated to reflect the current activities Changes were made to reflect the currentVI of the Maine Yankee ISFSI. practices at the Maine Yankee ISFSI. Thesechanges are consistent with approved procedures or other license basis documents.

11 Eliminated the list of specific low-level The general statement regarding the need forwaste disposal sites. access to low-level waste sites is sufficient atthis time. The decommissioning of the ISFSI isnot expected to occur for numerous years, thus,the names, owners, and locations of the sites thatwill be available at that time is not known.III Updated a quote to 10 CFR 51.23 The quote provided in the Post-Shutdown Decommissioning Activities Report does notaccurately reflect the current version of 10 CFR51.23. Thus, it was revised to incorporate anaccurate quotation.

IV, V Updated to reflect the new cost estimates The decommissioning cost estimate wasregarding decommissioning and storage submitted to the NRC in January 2013 as part ofof spent nuclear fuel and Greater than the Decommissioning Funding Plan. InClass C (GTCC) waste approved by addition, the Federal Energy Regulatory FERC in July 2013. The cost estimate Commission approved the newassumes that the storage period will be decommissioning cost estimate and a new costextended from 2022 to 2031 with license estimate for the management of spent nucleartermination in 2033. In addition, the fuel and GTCC Waste in July 2013.decommissioning cost estimate assumesthat all of the concrete and steel from theVCCs and ISFSI storage will be shippedoffsite as low-level radioactive waste.VI Updated to reflect the environmental The changes update the environmental impactimpacts associated with the change in associated with decommissioning the ISFSI andschedule for storage of spent nuclear the longer time period that the spent nuclear fuelfuel and GTCC waste and change in and GTCC waste will be stored onsite. Themethodology regarding disposal of the environmental impact remains bounded by thematerials comprising the Vertical previous assessment.

Concrete Casks and the ISFSI StoragePad as low-level radioactive waste.III, VI Editorial or administrative changes were These changes are non-substantive changes thatmade. do not modify the intent of the document.

1 of 1 ENCLOSURE 1 TO OMY-13-065 MAINE YANKEE ATOMIC POWER STATIONPOST-SHUTDOWN DECOMMISSIONING ACTIVITIES REPORTREVISION 2 -DECEMBER 2013 MAINE YANKEE ATOMIC POWER STATIONPOST-SHUTDOWN DECOMMISSIONING ACTIVITIES REPORTREVISION 2 -DECEMBER 2013 Maine Yankee Atomic Power Station Post-Shutdown Decommissioning Activities ReportTable of Contents1. INTRODUCTION II. OVERVIEW OF THE PSDARIII. DESCRIPTION OF PLANNED DECOMMISSIONING ACTIVITIES PlanningSite Characterization Decontamination Major Decommissioning Activities Other Decommissioning Activities Storage of Spent FuelFinal Site Survey and Termination of LicenseSite Restoration IV. SCHEDULE FOR DECOMMISSIONING ACTIVITIES V. DECOMMISSIONING COST ESTIMATEVI. ENVIRONMENTAL IMPACTSVII. REFERENCES Page 2 of 14Revision 2

Maine Yankee Atomic Power Station Post-Shutdown Decommissioning Activities ReportI. INTRODUCTION Under the provisions of 10CFR50.82 (a)(4)(i),

this Post Shutdown Decommissioning Activities Report (PSDAR) is submitted to describe Maine Yankee's planned decommissioning activities and schedule, provide an estimate of expected costs, and discuss the reasons for concluding thatthe environmental impacts associated with site-specific decommissioning activities are boundedby the appropriate previously issued environmental impact statements (EIS), specifically NUREG-0586, "Final Generic Environmental Impact Statement on Decommissioning of NuclearFacilities" (Reference

1) and Maine Yankee's Site Specific EIS (Reference 2).The reactor was shutdown on December 6, 1996 and has not been operated since. On June 20,1997 transfer of all fuel assemblies from the reactor vessel into the Spent Fuel Pool fortemporary storage was completed.

On August 6, 1997 the Maine Yankee Board of Directors voted to permanently cease further operation of the plant. Certification to the Nuclear Regulatory Commission of the permanent cessation of operation and permanent removal of fuel from thereactor vessel, in accordance with IOCFR50.82 (a)(1)(i)

& (ii), was filed on August 7, 1997(Reference 3).On July 30, 2002 and September 30, 2005 (References 7 and 8), the NRC issued Amendment Nos. 167 and 172, respectively, to Facility Operating License No. DPR-36 for the Maine YankeeAtomic Power Station that resulted in the release of all of the land from the Maine Yankee10 CFR 50 License, with the exception of the land where the Independent Spent Fuel StorageInstallation (ISFSI) is located and an adjacent parcel of land. The total area that remains underthe control of the 10 CFR 50 License is approximately 12 acres. Thus, the decommissioning ofthe Maine Yankee plant is complete.

The only remaining decommissioning activities are thoseassociated with the ISFSI and applicable areas.II. OVERVIEW OF THE PSDARThe goal of Maine Yankee is to decommission the plant and ISFSI safely and in a cost effective manner. Prompt decommissioning satisfies both objectives.

As of September 30, 2005, thedecommissioning of the plant is complete, with the exception of the areas associated with theISFSI. The ISFSI will be decommissioned following removal of the spent fuel and GTCC wastefrom the site. See Section V for a discussion of the cost estimate and Section VI for a review ofenvironmental impacts.Completion of the DECON schedule is contingent upon three key factors:* Continued access to one or more federally licensed low level waste disposal sites, and* Timely funding of the decommissioning activities.

" The removal of spent fuel and GTCC waste from the site by the Department of Energy.Page 3 of 14Revision 2

Maine Yankee Atomic Power Station Post-Shutdown Decommissioning Activities ReportIII. DESCRIPTION OF PLANNED DECOMMISSIONING ACTIVITIES On July 30, 2002 and September 30, 2005 (References 7 and 8), the NRC issued Amendment Nos. 167 and 172, respectively, to Facility Operating License No. DPR-36 for the Maine YankeeAtomic Power Station that resulted in the release of all of the land from the Maine Yankee10 CFR 50 License, with the exception of the land where the Independent Spent Fuel StorageInstallation (ISFSI) is located and an adjacent parcel of land. The total area that remains underthe control of the 10 CFR 50 License is approximately 12 acres. Thus, the decommissioning ofthe Maine Yankee plant is complete.

The only remaining decommissioning activities are thoseassociated with the ISFSI and applicable areas. The ISFSI will be dismantled after theDepartment of Energy (DOE) has taken possession of the stored materials and removed themfrom the site.The following discussion provides an outline of the decommissioning plans. This PSDARdescription is an overview of Maine Yankee's current intentions.

The detailed planning requiredfor each decommissioning activity will be completed prior to the start of work for that activity.

PlanningPlanning and preparation for the remaining decommissioning activities associated with the ISFSIwill include the following general types of activities:

• Develop decommissioning organization structure and select project staff* Review and reclassify

systems, structures, and components consistent with the removal ofspent fuel and Greater than Class C (GTCC) waste from the site" Review and revise licensing basis documents as necessary, consistent with the removal ofspent fuel and GTCC waste from the site" Review and revise programs and procedures as necessary, consistent with the removal ofspent fuel and GTCC waste from the site" Prepare detailed (area-by-area) decommissioning procedures and cost estimates Site Characterization A detailed site characterization was performed for the Maine Yankee plant. Surveys weredesigned and conducted to establish the contamination and radiation levels throughout thefacility.

This information was used in developing the detailed (area-by-area) procedures toensure that contaminated materials were removed and to ensure that worker exposure wasmaintained as low as reasonably achievable.

Surveys of the outdoor areas were performed inorder to confirm the locations of known contaminated soil and to identify any previously unknown contaminated soils.Page 4 of 14Revision 2

Maine Yankee Atomic Power Station Post-Shutdown Decommissioning Activities ReportA detailed characterization of the areas associated with the ISFSI will be conducted following the removal of the spent fuel and GTCC waste from the site.Decontamination Several different techniques can be employed in decontamination of surfaces.

These typically include wiping, washing, vacuuming, and water jets. The objectives of the decontamination effort are two-fold:

First, to reduce the radiation levels throughout the facility in order tominimize personnel exposure during dismantlement; and second, to clean as much material aspossible to unrestricted use levels, thereby permitting disposal as salvage and minimizing thequantities of material that must be disposed of by burial as radioactive waste.The RCS was decontaminated prior to dismantlement.

The resulting waste was disposed of inaccordance with plant procedures and applicable regulations.

Major Decommissioning Activities 10 CFR 50.2 defines "major decommissioning activity" as any activity that results in permanent removal of major radioactive components, permanently modifies the structure of thecontainment, or results in dismantling components for shipment containing greater than Class Cwaste in accordance with 10 CFR 61.55. The major activities are summarized as follows:* The steam generators and the pressurizer were dismantled and removed.* The upper and lower core support structures were segmented, packaged in shielded casks andremoved." The remaining reactor internals were segmented, packaged in shielded casks and removed.* The GTCC components were segmented as necessary for storage in canisters at the ISFSI.* The reactor vessel was packaged and removed." The neutron shield tank structure formerly surrounding the reactor vessel was segmented, packaged into shielded containers, and removed.* The RCS and other large-bore piping were segmented,

packaged, and removed.* The containment structure was dismantled and the material removed." The spent fuel facility was decontaminated, dismantled, and materials removed.Segmenting operations were developed as appropriate for the various components and/orselected portions of the facility.

Segments were placed in liners and stored using a remote orshielded crane. The liners were loaded into shielded transport casks for disposal at a commercial Page 5 of 14Revision 2

Maine Yankee Atomic Power Station Post-Shutdown Decommissioning Activities Reportshallow-land waste disposal facility.

Packaged items meeting 10 CFR 61.55 Class C or lesswere shipped and buried.The ISFSI storage pads and Vertical Concrete Casks are not expected to be significantly activated.

However, the ISFSI decommissioning cost estimate assumes that the materialcomprising the ISFSI storage pads and Vertical Concrete Casks will be disposed of as low-level radioactive waste.Other Decommissioning Activities Other decommissioning activities which do not meet the definition of "major activities" includethe following:

" Removal of low level waste. Radioactively contaminated or activated materials will beremoved from the site as necessary to allow the site to be released for unrestricted access.LLW will be processed in accordance with procedures and existing commercial

options, andsent to licensed disposal facilities.

Wastes may be incinerated, compacted, or otherwise processed by authorized and licensed contractors as appropriate.

" Removal of mixed wastes. If mixed wastes are generated, they will be managed according toall applicable federal and state regulations to the extent they are not inconsistent with NRChandling,

storage, and transportation regulations.

Mixed wastes from Maine Yankee will betransported only by authorized and licensed transporters and shipped only to authorized andlicensed facilities.

Processes to render the mixed wastes nonhazardous will be evaluated iftechnology, resources, and approved processes are available.

Storage of Spent FuelCongress passed the "Nuclear Waste Policy Act" in 1982, assigning the responsibility fordisposal of spent nuclear fuel created by the commercial nuclear generating plants to theDepartment of Energy (DOE). This legislation also created a Nuclear Waste Fund to cover thecost of the program, which is funded, in part, by the sale of electricity from the Maine Yankeeplant (and an estimated equivalent for assemblies irradiated prior to April, 1983). The target datefor startup of the federal Waste Management System was originally 1998.The backlog of spent fuel in the national inventory, delays in site characterization, andintermittent progress in the development of a waste transportation system, make it necessary toreflect spent fuel storage in the cost and schedule of commercial reactor decommissioning.

Forplanning

purposes, Maine Yankee has assumed that the high-level waste repository or someinterim storage facility will be operational by 2031. Spent fuel and GTCC waste will be stored atthe Maine Yankee ISFSI until DOE takes possession of the material and removes it from the site.Page 6 of 14Revision 2

Maine Yankee Atomic Power Station Post-Shutdown Decommissioning Activities ReportThe issue of storing spent fuel onsite is specifically addressed in 1OCFR5 1.23, which states:(a) The Commission has made a generic determination that, if necessary, spent fuel generated in any reactor can be stored safely and without significant environmental impacts for at least60 years beyond the licensed life for operation...of that reactor in a combination of storage inits spent fuel storage basin and at either onsite or offsite independent spent fuel storageinstallations.

Further, the Commission believes there is reasonable assurance that sufficient mined geologic repository capacity will be available to dispose of the commercial high-level radioactive waste and spent fuel generated in any reactor when necessary.

(b) Accordingly, as provided in §§ 51.30(b),

51.53, 51.61, 51.80(b),

51.95, and 51.97(a),

andwithin the scope of the generic determination in paragraph (a) of this section, no discussion of any environmental impact of spent fuel storage in reactor facility storage pools orindependent spent fuel storage installations (ISFSI) for the period following the term of thereactor operating license or amendment...

or initial ISFSI license or amendment for whichapplication is made, is required in any environmental report, environmental impact statement, environmental assessment, or other analysis prepared in connection with the issuance oramendment of an operating license for a nuclear power reactor under parts 50 and 54 of thischapter...

or the issuance of an initial license for storage of spent fuel at an ISFSI, or anyamendment thereto.Maine Yankee will continue to maintain and protect the ISFSI.Final Site Survey and Termination of LicenseMaine Yankee prepared and the NRC approved a License Termination Plan, which includes thedetails of the final radiological survey to be performed once the decontamination activities arecompleted.

Once the survey is complete, the results will be provided to the NRC in a format thatcan be verified.

As of September 30, 2005 (Reference 8), the only land that remains within the control of theMaine Yankee 10 CFR 50 License is the land associated with the ISFSI and an adjacent parcel ofland.Page 7 of 14Revision 2

Maine Yankee Atomic Power Station Post-Shutdown Decommissioning Activities ReportSite Restoration Although not within the scope of NRC regulation, Maine Yankee is presently considering restoring the site to a condition comparable to a natural state. This would be done in thefollowing manner:* Components and materials meeting NRC release criteria may be removed from the site anddisposed of as scrap, as salvage, or at regional land fills." Decontaminated structures will be demolished and removed to an approximate depth of threefeet below grade." The site will be back-filled with clean material, graded, and landscaped.

IV. SCHEDULE FOR DECOMMISSIONING ACTIVITIES Maine Yankee intends to pursue decommissioning by prompt dismantlement, with the exception of the Maine Yankee ISFSI and applicable areas. The schedule outlined below reflects thisintention.

The actual schedule may differ in response to the availability of waste disposalfacilities, or unforeseen circumstances.

Period I -Preparation I Planning" Activities include site characterizations, engineering evaluations and planning, development of detailed procedures for dismantlement and disposal, design and procurement of specialtools, and site preparation activities.

The site characterization activities for Maine YankeeNuclear Plant are complete.

" Decontamination of some components and piping systems were performed to minimizeworker exposure.

Period 2 -Decommissioning Operations and License Termination

" On July 30, 2002 and September 30, 2005 (References 7 and 8), the NRC issued Amendment Nos. 167 and 172, respectively, to Facility Operating License No. DPR-36 for the MaineYankee Atomic Power Station that resulted in the release of all of the land from the MaineYankee 10 CFR 50 License, with the exception of the land where ISFSI is located and anadjacent parcel of land. The total area that remains under the control of the 10 CFR 50License is approximately 12 acres. Thus, the decommissioning of the Maine Yankee plant iscomplete.

The only remaining decommissioning activities are those associated with the ISFSIand applicable areas." Final site survey and license termination, as discussed above under the heading "Final SiteSurvey and Termination of License."

Page 8 of 14Revision 2

Maine Yankee Atomic Power Station Post-Shutdown Decommissioning Activities ReportPeriod 3 -Site Restoration

" Demolition of the ISFSI storage pads, Vertical Concrete Casks, and remaining buildings andother structures will be performed using conventional demolition techniques.

Site Areasaffected by the dismantling activities will be cleaned and the ISFSI area graded as required toprevent ponding and inhibit the refloating of subsurface materials.

" The Maine Yankee ISFSI is expected to be operated until 2031, when the spent fuel andGTCC waste is expected to be removed from the site. Using this assumption, the MaineYankee license will be terminated after the ISFSI is decommissioned.

This is scheduled tooccur in 2033.V. DECOMISSIONING COST ESTIMATEThe current Federal Energy Regulatory Commission (FERC) approved decommissioning costestimate (December 2012) and cost estimate for management of spent fuel and GTCC waste isbased on the Stipulation and Settlement Agreement between MYAPCO and the Connecticut Public Utilities Regulatory Authority, the Connecticut Office of Consumer

Counsel, the MainePublic Utilities Commission, the Maine Office of Public Advocate, the Massachusetts Department of Public Utilities, and the Attorney General of Massachusetts dated April 30, 2013.This cost estimate includes the cost associated with the projected ISFSI decommissioning costsand a funding assumption of 15 years of operations costs to manage spent fuel and GTCC waste.A funding mechanism provides that damage awards and settlement proceeds that MYAPCOreceives in future phases of its litigation with the Department of Energy (DOE) will be applied tomaintain the adequacy of the Nuclear Decommissioning Trust (NDT) to cover 15 years of ISFSIoperations (as well as all other projected decommissioning costs). In addition, MYAPCO has theright to resume collection of decommissioning charges from its customers subject to thesubmittal of a proposal under section 205 of the Federal Power Act, if needed.MYAPCO has an account within its NDT entitled, "ISFSI Radiological Decom," that segregates the funds for radiological decommissioning of the ISFSI from the larger balance of funds forongoing management of spent fuel and GTCC waste held in the NDT.The assumptions of the current decommissioning cost estimate are discussed in theDecommissioning Funding Plan submitted to the NRC on January 8, 2013 in accordance with10 CFR 72.30(b)(2)

(Reference 9). The decommissioning cost estimate incorporates the mostrecent assumptions with respect to the remaining decommissioning activities and related costs(i.e., those associated with the Maine Yankee ISFSI). The total un-escalated cost estimate fordecommissioning the ISFSI, including contingency is $26.8 million, which includes$22.1 million for radiological removal and $4.7 million for non-radiological removal.

Thedecommissioning cost estimate is in 2013 dollars.ISFSI operations will continue until DOE removes the spent fuel and GTCC waste, allowing forthe decommissioning of the ISFSI. MYAPCO expects that the ISFSI operating costs willcontinue to cover a number of categories, including costs for insurance, labor, security, materials Page 9 of 14Revision 2

Maine Yankee Atomic Power Station Post-Shutdown Decommissioning Activities Reportand supplies, miscellaneous

expenses, outside services, property taxes, regulatory fees, rentalsand leases and utilities.

The un-escalated cost estimate for the management of spent fuel andGTCC waste from 2013 through 2032, including contingency, is $187.2 million.

The costestimate is in 2013 dollars.

This is based on the estimate submitted to FERC on May 1, 2013(Reference 10).The total un-escalated cost estimate is approximately

$214 million for decommissioning theISFSI and managing the storage of spent fuel and GTCC waste for the time period of 2013through 2033.MYAPCO will continue to inform the NRC regarding the status of this funding by complying with the obligations defined in: 1) 10 CFR 50.75(0(1) and (2) to submit an annualDecommissioning Funding Status Report; 2) 10 CFR 50.82(a)(8)(v) to submit an annualfinancial assurance status report regarding decommissioning funding;

3) 10 CFR 72.30(c) toresubmit the decommissioning funding plan at intervals not to exceed three years; and4) 10 CFR 50.82(a)(8)(vii) to submit an annual report regarding the status of the funding formanaging irradiated fuel.VI. ENVIRONMENTAL IMPACTS10 CFR 50.82 (a)(4)(i) describes the Post-Shutdown Decommissioning Activities Report(PSDAR),

and requires that it include "a discussion that provides the reasons for concluding thatthe environmental impacts associated with the site-specific decommissioning activities will bebounded by appropriate previously issued environmental impact statements."

The following discussion provides our reasons for drawing that conclusion, based on three previously issueddocuments:

1) Maine Yankee Atomic Power Station Environmental Report, Supplement One,dated April 19, 1972 [Reference 4]; 2) the Final Environmental Statement Related to Operation ofMaine Yankee Atomic Power Station, dated July 1972 [Reference 2]; and 3) NUREG-0586, "Final Generic Environmental Impact Statement (GEIS) on decommissioning nuclear facilities"

[Reference 1 ].Decommissioning the Maine Yankee plant and ISFSI will have generally positive environmental

effects, in that:* Radiological sources that create the potential for radiation exposure to site workers and thepublic will be eliminated

• Decommissioning will return the site to a condition allowing unrestricted usePage 10 of 14Revision 2

Maine Yankee Atomic Power Station Post-Shutdown Decommissioning Activities ReportFurther, the Maine Yankee plant and ISFSI decommissioning will be accomplished with nosignificant adverse environmental

impacts, in that:" No Maine Yankee site specific factors would alter the conclusions of the GEIS or the earlierenvironmental report and statement

" Radiation dose to the public will be minimal" Radiation dose to decommissioning workers will be a small fraction of the operating experience

• The low-level radioactive waste removed from the site will occupy a small burial volume atapproved waste disposal sites* The non-radiological environmental impacts are temporary and not significant The effects of decommissioning activities with respect to specific environmental issues arediscussed briefly below. As of September 30, 2005 (Reference 8), the decommissioning of theMaine Yankee plant was complete.

The only decommissioning activities that remain are thoseactivities associated with the Maine Yankee ISFSI and associated areas that remain under thecontrol of the Maine Yankee 10 CFR 50 License.Radiation Dose to the PublicRadiation dose to the public will be maintained below comparable levels when the plant wasoperating through the continued application of radiation protection and contamination controlscombined with the reduced source term available in the facility.

Occupational Radiation ExposureMaine Yankee has estimated that a total of 9.46 person-Sv (946 person-rem) would be incurredduring the decommissioning of Maine Yankee, with the exception of those associated with thedecommissioning of the ISFSI. This total includes the exposure from decontamination anddismantlement activities and the exposure during transportation of the low-level wastes. Giventhe low levels of activation expected on the Vertical Concrete Casks and the ISFSI storage pads,the total radiation exposure for decommissioning the ISFSI is expected to be insignificant.

NUREG-0586

[Reference 1], Table 4.3-2, estimates a total dose of 12.15 person-Sv (1215 person-rem) for the DECON alternative for the reference plant. While the Maine Yankeedecommissioning will delay the decontamination and dismantlement of the ISFSI and applicable areas until the DOE takes possession of and removes the spent fuel and GTCC waste, the planclosely resembles the DECON alternative of NUREG-0586.

The 9.46 person-Sv (946 person rem) total dose for the Maine Yankee decommissioning is below the 12.15 person-Sv (1215 person-rem) total dose that was found acceptable for decommissioning the reference PWR in the "Final Generic Environmental Impact Statement on decommissioning of nuclearfacilities,"

NUREG-0586

[Reference-3].

Page 11 of 14Revision 2

Maine Yankee Atomic Power Station Post-Shutdown Decommissioning Activities ReportLow-Level Radioactive Waste Burial VolumeMaine Yankee estimated the low-level waste burial volume for immediate dismantlement as209,000 cubic feet (or 5,920 cubic meters).

The GElS estimates the volume as 18,340 cubicmeters. The Maine Yankee estimate assumed the use of present-day volume reduction techniques not credited in the GEIS. For high level waste requiring deep geological burial (greater than classC waste), Maine Yankee estimates 227 cubic feet (or 6.5 cubic meters).

The GEIS estimates thevolume of high level waste as 88 cubic meters.A significant portion of the LLRW that was shipped offsite contained very low levels ofradioactivity (DOT exempt) and was created as a result of remediation activities to satisfy theState of Maine radiological release criteria or to more efficiently decommission the facility.

The decommissioning cost estimate assumes that all of the material associated with the VerticalConcrete Casks and the ISFSI storage pads will be shipped offsite as LLRW. This assumption was made to maximize the cost of disposal of radioactive materials in the decommissioning costestimate.

Maine Yankee does not anticipate that this material would be required to be disposed ofto satisfy the NRC's 25 mRem/year release criteria.

These estimates thus support the conclusion that the previously issued environmental statements are bounding, since the disposal of waste will require fewer resources (i.e., less waste disposalfacility area) than considered in the GEIS.Non-Radiological Environmental ImpactsThe non-radiological environmental impacts from the Maine Yankee decommissioning aretemporary and not significant.

The largest occupational risk associated with the decommissioning isthe risk of industrial accidents.

This will be addressed by adherence to work controls duringdecommissioning, similar to the procedures followed during power operation.

Procedures controlling work related to asbestos, lead, and other non-radiological hazards will also remain in place during thedecommissioning.

The primary environmental effects of the decommissioning are temporary, smallincreases in noise levels and dust in the immediate vicinity of the site, and truck traffic to and fromthe site for hauling equipment and waste. These effects will be similar to those experienced duringnormal refueling

outages, and certainly less severe than those present during the original plantconstruction.

No significant socioeconomic impacts or impacts to local culture, terrestrial or aquaticresources have been identified.

Additional Considerations While not quantitative, the following considerations are also relevant to concluding thatdecommissioning activities will not result in significant environmental impacts not previously reviewed.

• The release of effluents will continue to be controlled by procedures throughout thedecommissioning.

With respect to radiological

releases, Maine Yankee will continue tooperate in accordance with the Offsite Dose Calculation Manual (ODCM) during thePage 12 of 14Revision 2

Maine Yankee Atomic Power Station Post-Shutdown Decommissioning Activities Reportdecommissioning activities.

No gaseous or liquid effluents are expected during the period ofstorage of spent fuel and GTCC waste at the ISFSI and the decommissioning of the ISFSI.The remaining dose contributor will be shine through the Vertical Concrete Casks. No non-radioactive effluents are expected during the period of storage of spent fuel and GTCC wasteat the ISFSI and the decommissioning of the ISFSI. Any releases of non-radiological effluents would be controlled per the applicable requirements during the decommissioning ofthe Maine Yankee plant" Radiation protection principles will remain in effect during decommissioning to ensure thatprotective techniques,

clothing, and breathing apparatus are used as appropriate.

" Sufficient decontamination prior to dismantlement will be performed to ensure thatindividual and integrated doses will not exceed those estimated in the final genericenvironmental impact statement.

• Detailed site radiological surveys will be performed to confirm the burial volume of low-level radioactive waste, and highly activated components which require deep geological disposal.

" Detailed site radiological surveys will be performed to identify the requirements fordecontaminating the ground surrounding the ISFSI." Transport of radioactive waste will be in accordance with procedures, applicable federalregulations, and the requirements of the receiving facility.

" Site access control will be maintained during decommissioning to ensure that residualcontamination is minimized or eliminated as radiation pathways to the public duringdecommissioning.

Conclusion Based on the above, Maine Yankee concludes that the environmental impacts associated with thesite-specific decommissioning activities (including the decommissioning of the ISFSI) will bebounded by appropriate previously issued environmental impact statements.

Should unforeseen circumstances arise that may challenge a bounding environmental impact, Maine Yankee willseek prior NRC review and approval before proceeding.

VII. REFERENCES

1. NUREG-0586, "Final Generic Environmental Impact Statement on Decommissioning ofNuclear Facilities,"

dated August, 19882. "Final Environmental Statement related to operation of Maine Yankee Atomic PowerStation,"

dated July 19723. MN-97-89, MY Letter to NRC, "Certifications of Permanent Cessation of PowerOperation and Permanent Removal of Fuel From the Reactor,"

dated 8/7/97Page 13 of 14Revision 2

Maine Yankee Atomic Power Station Post-Shutdown Decommissioning Activities Report4. Maine Yankee Atomic Power Station Environmental Report, Supplement One, datedApril 19, 1974 (MY APC to AEC)5. NUREG/CR-5849, "Manual for Conducting Radiological Surveys in Support of LicenseTermination"

6. AIF/NESP-036, "Guidelines for Producing Commercial Nuclear Power PlantDecommissioning Cost Estimates

7. Letter from (NRC) to (MYAPCO),

Issuance of Amendment No. 167 to FacilityOperating License No. DPR-36, dated July 30, 20028. Letter from D. Gillen (NRC) to J. Niles (MYAPCO),

Issuance of Amendment No. 172 toFacility Operating License No. DPR-36 -Maine Yankee Atomic Power Station (TACNo. M8000), dated September 30, 20059. Letter from C. Pizzella (MYAPCO) to U.S. Nuclear Regulatory Commission, OMY-13-003, "Revised Independent Spent Fuel Storage Installation Decommissioning FundingPlan," dated January 8, 201310. Letter from Alston & Bird LLP to Federal Energy Regulatory Commission, "MaineYankee Atomic Power Company Docket No. ER 13- -000," dated May 1, 2013Page 14 of 14Revision 2