ML090570189

Energysolutions - Document No. 82A9634, Revision 0, Decommissioning Cost Estimate Study for the Duane Arnold Energy Center.

ML090570189
Person / Time
Site:	Duane Arnold
Issue date:	11/20/2008
From:	Walker L EnergySolutions
To:	Duane Arnold, Office of Nuclear Reactor Regulation
References
137079, FOIA/PA-2010-0209 82A9634, Rev. 0
Download: ML090570189 (190)

Text

{{#Wiki_filter:ENERGYSOLUTIONS Document No. 82A9634 Decommissioning Cost Estimate Study for the Duane Arnold Energy Center Project No. 137079 Revision 0 Prepared for: FPL Energy Duane Arnold, LLC 3277 DAEC Road Palo, IA 52324 Prepared by: EnergySolutions, Inc. Commercial Decommissioning Services Division 143 West Street, Unit E New Milford, CT 06776 Authored By: 11/20/08 Lisa J.S. Wjker, Senior Cost Engineer Date Approved By: ... ._ _11/20/08 Bar Sims oct Ianager Date [*] New Report D Title Change D Report Revision I Report Rewrite Effective Date 11/20/08 Electronic documents, once printed, are uncontrolled and may become outdated. Refer to Document Control authority for the correct revision.

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 TABLE OF CONTENTS Section Page 1.0 EXECUTIVE

SUMMARY

..............................................................................................                         4

2.0 INTRODUCTION

.......................................................................................................                       8 2.1   Study O bjective ...................................................................................................               8 2.2  Regulatory Framework .......................................................................................                        9 3.0   STUDY METHODOLOGY ...............................................................................................                         11 3.1   General Description ..............................................................................................                11 3.2   Schedule Analysis ............................................................................................                    11 3.3  Decommissioning Staff...........................................                                                                   12 3.4   Waste D isposal ...................................................................................................               13 3.5  Final Status Survey .........................................................................................                      16 3.6   C ontingency ..........................................................................................................           16 3.7   C ost R eporting ..................................................................................................               17 4.0   SITE SPECIFIC TECHNICAL APPROACH ................................................................                                         18 4.1  Facility D escription ..........................................................................................                   18 4.2  Decommissioning Periods for Scenario I .........................................................                                   18 4.3  Decommissioning Periods for Scenario 2 .......................................................                                     20 4.4  Decommissioning Periods for Scenario 3 .......................................................                                     22 4.5  Decommissioning Periods for Scenario 4 .......................................................                                     24 4.6  Decommissioning Staff ...................................................................................                          26 4.7   Spent Fuel Management Staff ........................................................................                              26 4.8   Spent Fuel Shipments .......................................................................................                      27 5.0   BASES OF ESTIMATE AND KEY ASSUMPTIONS .................................................                                                   28 6.0   STUDY  RESULTS BY SCENARIO .............................................................................                                  33 6.1   Scenario 1 - Base Case .....................................................................................                      33 6.2   Scenario 2 - Base Case, Except SAFSTOR .....................................................                                      40 6.3   Scenario 3 - Base Case, Except License Extension ........................................                                         47 6.4   Scenario 4 - Base Case, Except SAFSTOR and License Extension ................                                                     51 7.0   RE FEREN C ES ...................................................................................................................         58 FIGURES Figure  1-1     Scenario   1 Summary             Schedule         ........................................................................       7 Figure 6-1      Scenario   1 Summary             Schedule         ......................................................................        35 Figure 6-2      Scenario   2 Summary             Schedule         ......................................................................        41 Figure 6-3      Scenario   3 Summary             Schedule         ......................................................................        48 Figure 6-4      Scenario   4 Summary             Schedule         ......................................................................        52 Page 2 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 TABLES Table 1-1 License Termination Cost Summary by Scenario...................................... 5 Table 1-2 Spent Fuel Management Cost Summary by Scenario.................................. 6 Table 1-3 Greenfield Cost Summary by Scenario.................................................. 6 Table 6-1 Scenario 1 Cost and Schedule Summary .............................................. 36 Table 6-2 Scenario 1 DAEC Staff Levels ......................................................... 37 Table 6-3 Scenario 1 DGC Staff Levels ........................................................... 38 Table 6-4 Scenario 1 Waste Disposal Volumes................................................... 39 Table 6-5 Scenario 2 Cost and Schedule Summary .............................................. 42 Table 6-6 Scenario 2 DAEC Staff Levels ......................................................... 43 Table 6-7 Scenario 2 DGC Staff Levels ........................................................... 45 Table 6-8 Scenario 2 Waste Disposal Volumes ................................................... 46 Table 6-9 Scenario 3 Cost and Schedule Summary .............................................. 49 Table 6-10 Scenario 3 Waste Disposal Volumes................................................... 50 Table 6-11 Scenario 4 DAEC Staff Levels ......................................................... 53 Table 6-12 Scenario 4 DGC Staff Levels ........................................................... 55 Table 6-13 Scenario 4 Cost and Schedule Summary .............................................. 56 Table 6-14 Scenario 4 Waste Disposal Volumes................................................... 57 APPENDICES Appendix A List of Systems and Structures Appendix B Spent Fuel Shipping Schedules Appendix C Detailed Project Schedules Appendix D Detailed Cost Tables Appendix E Annual Cash Flow Tables Appendix F Detailed Annual Cash Flow Tables Page 3 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 1.0 EXECUTIVE

SUMMARY

This report presents the results of a site-specific decommissioning cost estimate for FPL Energy Duane Arnold, LLC's (FPLE) Duane Arnold Energy Center (DAEC) 1. The study has been performed to furnish an estimate, for financial planning purposes, of the costs for (1) decommissioning DAEC to the extent required to terminate the plant's operating license pursuant to 10 CFR 50.75(c), (2) post-shutdown management of spent fuel until acceptance by the U.S. Department of Energy (DOE) pursuant to 10 CFR 50.54(bb), and (3) clean demolition of structures and restoration of the site to Greenfield conditions (Ref. No. 1). The study methodology follows the basic approach originally presented in the Atomic Industrial Forum/National Environmental Studies Project Report AIF/NESP-036, "Guidelines for Producing Commercial Nuclear Power Plant Decommissioning Cost Estimates," (Ref. No. 2). The report was prepared in accordance with Nuclear Regulatory Commission (NRC) Regulatory Guide 1.202, "Standard Format and Content of Decommissioning Cost Estimates for Nuclear Power Reactors," (Ref. No. 3). The estimate is based on compliance with current regulatory requirements and proven decommissioning technologies. NRC requirements set forth in Title 10 of the Code of Federal Regulations (CFR) differentiate between the post-shutdown costs associated with storage of. spent fuel on-site and those associated with the decommissioning of the facility. 10 CFR 50.75(c) requires funding by the licensee of the facility for the decommissioning program, but specifically excludes the cost of removal and disposal of spent fuel and the removal of clean structures. 10 CFR 50.75(c) also excludes the cost of site restoration activities that do not involve the removal of residual radioactivity necessary to terminate the NRC license, which restore the site to either "Brownfield" or "Greenfield" conditions depending on the desired end-state. 10 CFR 50.54 (bb) requires funding by the licensee "for the management of all irradiated fuel at the reactor upon expiration of the reactor operating license until title to the irradiated fuel and possession of the fuel is transferred to the Secretary of Energy for its ultimate disposal in a repository." Accordingly, the costs and schedules for all activities are segregated for regulatory purposes as follows: costs for "License Termination" (10 CFR 50.75(c)); costs for "Spent Fuel Management" (10 CFR 50.54(bb)); and costs for "Greenfield" (clean removal and site restoration) final site conditions. EnergySolutions has established a Work Breakdown Structure (WBS) and cost accounting system to differentiate between these three project accounts. The study analyzes .the following four decommissioning scenarios for DAEC, as defined by FPLE: Scenario 1 Base Case

           "   DECON methodology.
           "   No license extension, with shutdown on February 21, 2014.
           "   Terminate spent fuel pool operation five years after permanent unit shutdown.
           "   Spent fuel will be stored at the existing Independent Spent Fuel Storage Installation (ISFSI).

FPLE owns 70% of and operates DAEC. The other owners of DAEC are Central Iowa Power Cooperative (20%) and Corn Belt Power Cooperative (10%). All numbers presented in this report are on a 100% basis. Page 4 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0

           " Class B and C waste will be temporarily stored in an on-site interim waste storage facility to be built during decommissioning. Class B and C waste are assumed to be stored on-site until 2025, which is the assumed date a licensed facility would be available to receive these wastes.
           " The DOE Yucca Mountain repository, or other approved method of spent fuel disposition, will be available starting in 2025.

Scenario 2 Base case, except using SAFSTOR methodology.

• Class B and C waste generated during operations and SAFSTOR preparations will be stored in the existing Low Level Radwaste Storage Building until 2025, which is the assumed date a licensed facility would be available to receive these wastes.

Scenario 3 Base case, except 20-year license extension, and no requirement for on-site interim storage of Class B and C waste. Scenario 4 Scenario 2, except with 20-year license extension, and no requirement for on-site interim storage of Class B and C waste. Each scenario incorporates the spent fuel schedules developed by FPLE. All scenarios are based on performance of decommissioning by a Decommissioning General Contractor (DGC) under the management and supervision of DAEC staff. DAEC staff will be supplemented with a professional engineering consulting firm for planning and preparation, engineering design, and final status survey. The cost estimate results for all four scenarios are provided in 2008 dollars in Tables 1-1; 1-2, and 1-3. Table 1-1 contains License Termination costs, which correspond to 10 CFR 50.75 (c) requirements. Table 1-1 License Termination Cost Summary by Scenario (2008 Dollars in Thousands) Licenise , Terminiation -

                                   >ScenaIrio            i.5c 1                    $495,699 2                    $579,393 3                    $482,746 4                    $578,794 Page 5 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Table 1-2 contains Spent Fuel Management costs, which correspond to 10 CFR 50.54 (bb) requirements. Table 1-2 Spent Fuel Cost Summary by Scenario (2008 Dollars in Thousands) 2 $274,041 3 $234,441 4 $230,632 Table 1-3 contains Greenfield costs, which correspond to activities such as clean building demolition and site grading and re-seeding. Table 1-3 Greenfield Cost Summary by Scenario (2008 Dollars in Thousands) 1 34U, / IU 2 $41,298 3 $40,710 4 $40,969 The estimate is based on site-specific plant systems and buildings inventories developed from material take-offs performed by EnergySolutions. These inventories and EnergySolutions' proprietary Unit Cost Factors (UCFs) were used to generate required manhours, activity schedule hours and costs, and waste volume, weight, and classification. Based on the activity schedule hours and a decommissioning activities analysis, a Critical Path Method (CPM) analysis was performed to determine the decommissioning schedules. These schedules reflect the effects of sequenced activity-dependent or distributed decommissioning elements such as planning and preparations, major component removal, building decontamination, and spent fuel shipping. The schedules are divided into project phases (periods) and presented, as noted previously, by cost account "License Termination," "Spent Fuel Management," or "Greenfield." The summary schedule for Scenario 1 is shown in Figure 1-1. The summary schedules for all the scenarios may be found in sections 6.1 through 6.4 of this report. Page 6 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Figure 1-1 DUANE ARNOLD ENERGY CENTER SCENARIO 1

SUMMARY

SCHEDULE Splent Fuol Management 612312013 2121/2027 Spooi Poet Shlipp~ingto DOE Reipostory Begirns if 212 1~ Spent Fuel Shipping Complete 2/22/54

                                                                                                        ...... i2/2o*t3 "                                                     .     .

Dry Pdl I Fo Pool wislnd Design 0 2 20 14 12... .q Dr Pd2Spool Puel Cooling and Troociorlo Dry Storage 6231/2013 Dry Pd 3 - Dry Storage During Decommissioning 212112019 . . . . . .* I . . = "

• I I 1 I I II I I T6i IZ'6541-Dry PO Dry Storage onij ..... 1013012025 DryýPd S-SIDeoonnast.-onin g SF-11000r0 Ternliollon .2/27/201 211812012

                 *Unit 1 Shrutdcvmn                                                                                        212112014             2121 Decon Pd 1 - Decommissioning Planning Prior to Shutdown                                                  2/1/014 ,oi*o,

i o2*: :  : : : Y: __ i i i ! i i ! ! ! ! i i  : i i i i '

2/2112014 becon Pd 2i- Site Modifications and Preparations 21211/2015 Decon Pd 3 - Major Componont Romonal 3/412019 t. . . . . . Decon Pd 4 - Balance of Plant Decontamination 314/2019 V17202`1 Docon Pd5- *oirn*m Wasote Storage Facility Operation, 18/72021 M10/02025 0ra Pd I - Clean Building Dmolition 212/2022 2/24/12022 drin Pd 2 - Site Restoration

        . . . . ....... .. .. ..... . . . . . . . . . . .. ..... . . . .... .... .. ........ . ........

Page 7 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0

2.0 INTRODUCTION

2.1 Study Objective This report presents the results of a site-specific decommissioning cost estimate for FPL Energy Duane Arnold, LLC's (FPLE) Duane Arnold Energy Center (DAEC). The study has been performed to furnish an estimate, for financial planning purposes, of the costs for (1) decommissioning DAEC to the extent required to terminate the plant's operating license pursuant to 10 CFR 50.75(c), (2) post-shutdown management of spent fuel until acceptance by the U.S. Department of Energy (DOE) pursuant to 10 CFR 50.54(bb), and (3) clean demolition of structures and restoration of the site to Greenfield conditions (Ref. No. 1). The study methodology follows the basic approach originally presented in the Atomic Industrial Forum/National Environmental Studies Project Report AIF/NESP-036, "Guidelines for Producing Commercial Nuclear Power Plant Decommissioning Cost Estimates," (Ref. No. 2). The report was prepared in accordance with Nuclear Regulatory Commission (NRC) Regulatory Guide 1.202, "Standard Format and Content of Decommissioning Cost Estimates for Nuclear Power Reactors," (Ref. No. 3). The estimate is based on compliance with current regulatory requirements and proven decommissioning technologies. The study analyzes the following four scenarios, as defined by FPLE: Scenario 1 Base Case

          " DECON methodology.
          " No license extension, with shutdown on February 21, 2014.

• Terminate spent fuel pool operation five years after permanent unit shutdown.

          " Spent fuel will be stored at the existing Independent Spent Fuel Storage Installation (ISFSI).
          " Class B and C waste will be temporarily stored in an on-site interim waste storage facility to be built during decommissioning. Class B and C waste are assumed to be stored on-site until 2025, which is the assumed date a licensed facility would be available to receive these wastes.
          " The DOE Yucca Mountain repository, or other approved method of spent fuel disposition, will be available starting in 2025.

Scenario 2 Base case, except using SAFSTOR methodology. M Class B and C waste generated during operations and SAFSTOR preparations will be stored in the existing Low Level Radwaste Storage Building until 2025, which is the assumed date a licensed facility would be available to receive these wastes. Scenario 3 Base case, except 20-year license extension, and no requirement for on-site interim storage of Class B and C waste. Scenario 4 Scenario 2, except with 20-year license extension, and no requirement for on-site interim storage of Class B and C waste. Page 8 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 2.2 Regulatory Framework Provisions of current laws and regulations affecting decommissioning, waste management and spent fuel management are as follows:

1. Current NRC policy requires either: (a) removal of all spent fuel from a facility licensed under 10 CFR 50, or (b) on-site storage of spent fuel at an ISFSI under the general license set forth in 10 CFR 72, or (c) on-site storage of spent fuel under a site-specific ISFSI Part 72 license, before the license can be terminated

2. 10 CFR 50.75(c) requires funding by the licensee of the facility for the decommissioning program, but specifically excludes the. cost of removal and disposal of spent fuel and the removal of clean structures.

3. 10 CFR 50.54 (bb) requires the licensee, within two years following permanent cessation of operation of the reactor or five years before expiration of the operating license, whichever occurs first, to submit written notification to the NRC for its review and preliminary approval of the program by which the licensee intends to manage and provide funding "for the management of all irradiated fuel at the reactor upon expiration of the reactor operating license until title to the irradiated fuel and possession of the fuel is transferred to the Secretary of Energy for its ultimate disposal in a repository." However, the NRC does not currently consider post-shutdown spent fuel management costs to be decommissioning costs.

4. 10 CFR Part 961 (Ref. No. 4), Appendix E, requires spent fuel to be cooled in the spent fuel pool for at least five years before it can be accepted by DOE.

5. A bill to enact the "Atlantic Interstate Low-Level Radioactive Waste Compact Implementation Act" was signed by the Governor of South Carolina on June 6, 2000. The Atlantic Compact consists of South Carolina, Connecticut and New Jersey. Under the Act, effective June 2008, the Atlantic compact now prohibits out-of-region low level waste (LLW) generators, including FPLE, from disposing of LLW at the Barnwell disposal facility. Barnwell is one of only two facilities in the United States currently licensed to dispose of Class B and C LLW.

Decommissioning Alternatives The three basic methods for decommissioning are DECON, SAFSTOR, and ENTOMB, which are summarized as follows:

1. DECON: The equipment, structures, and portions of the facility and site that contain radioactive contaminants are promptly removed or decontaminated to a level that permits termination of the license after cessation of operations.

2. SAFSTOR: The facility is placed in a safe, stable condition and maintained in that state (safe storage). The facility is decontaminated and dismantled at the end of the storage period to levels that permit license termination. NRC regulations require decommissioning to be completed within 60 years of cessation of Page 9 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 operation. Durations less than the regulatory-allowed maximum may be referred to as Modified SAFSTOR.

3. ENTOMB: Radioactive structures, systems, and components are encased in a structurally long-lived substance, such as concrete. The entombed structure is appropriately maintained and monitored until radioactivity decays to a level that permits termination of the license. Since entombment will exceed the requirement for decommissioning to be completed within 60 years of cessation of operation, NRC handles entombment requests on a case-by-case basis.

The selection of a preferred decommissioning alternative is influenced by a number of factors pertinent at the time of final plant shutdown. These factors include the cost of each decommissioning alternative, minimization of occupational radiation exposure, availability of a low-level waste disposal facility, availability of a high-level waste (spent fuel) repository, regulatory requirements, and public concerns. Post-Shutdown Spent Fuel Management Alternatives The earliest date for start-up of the DOE's Yucca Mountain repository is currently 20202. However, there is considerable uncertainty associated with this scheduled opening. Per guidance from FPLE, this study assumes that the DOE Yucca Mountain repository, or other approved method of spent fuel disposition, will be available starting in 2025. Therefore, long-term post-shutdown spent fuel storage must be addressed as an integral element of decommissioning planning. The basic options for long-term post-shutdown spent fuel management are (1) wet storage consisting of continued maintenance and operation of the spent fuel pool, (2) dry storage consisting of transfer of spent fuel from the fuel pool to on-site dry storage modules following the minimum cooling period, and (3) off-site storage at a licensed private or commercial storage facility. The third option is not commercially viable as of the date of this study. The selection of a spent fuel management alternative has a significant impact on decommissioning. Maintaining the spent fuel pool for an extended duration following cessation of operations prevents termination of the Part 50 license and typically has a higher annual maintenance and operating cost than the dry storage alternative. Transfer of spent fuel to an ISFSI requires (1) capital expenditures for purchase and construction of the ISFSI, if needed, and (2) dismantlement and disposal of the ISFSI following completion of spent fuel transfer to DOE. 2 Summary, Edward F. Sproat, III, Director Office of Civilian Radioactive Waste Management, U.S. Department of Energy Before the Subcommittee on Energy and Air Quality, Committee on Energy and Commerce, U.S. House of Representatives, July 15, 2008 Page 10 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 3.0 STUDY METHODOLOGY 3.1 General Description EnergySolutions maintains a proprietary decommissioning cost model based upon the fundamental technical approach established in AIF/NESP-036, "Guidelines for Producing Commercial Nuclear Power Plant Decommissioning Cost Estimates," dated May 1986 (Ref. No. 2). The cost model has been continuously updated in accordance with regulatory requirements and industry experience. The cost model includes elements for estimating distributed and undistributed costs. Distributed costs are activity specific and include planning and preparation costs as well as the decontamination, packaging, disposal, and removal of major components and systems. For example, the segmentation, packaging, and disposal of the reactor internals is a distributed cost. Undistributed costs, sometimes referred to as collateral costs, are typically time dependent costs such as utility and decommissioning general contractor staff, property taxes, insurance, regulatory fees and permits, energy costs, and security staff. The methodology for preparing cost estimates for a selected decommissioning alternative requires development of a site-specific detailed work activity sequence based upon the plant inventory. The activity sequence is used to define the labor, material, equipment, energy resources, and duration required for each activity. In the case of major components, individual work sequence activity analyses are performed based ýon the physical and radiological characteristics of the component and the packaging, transportation, and disposal options available. In the case of structures and small components and equipment such as piping, pumps, and tanks, the work durations and costs are calculated based on Unit Cost Factors (UCFs). UCFs are economic parameters developed to express costs per unit of work output, piece of equipment, or time. They are developed using decommissioning experience, information on the latest technology applicable to decommissioning, and engineering judgment. The total cost of a specific decommissioning activity can be determined by multiplying the total number of units associated with that activity by the UCF, expressed as $/unit, for that activity. For example, the estimated demolition cost of a non-contaminated concrete structure can be obtained by multiplying the volume of concrete in the structure by the UCF for non-contaminated reinforced concrete demolition, expressed in $/unit volume. Each UCF has associated with it a man-hours/unit and schedule-hours/unit. From these values, total man-hours and total schedule-hours can be determined for a particular activity. 3.2 Schedule Analysis Once the work activity durations are calculated for all distributed activities, a critical path schedule analysis is performed using MS Project. The schedule accounts for constraints such as spent fuel cooling periods and regulatory reviews. The schedule is typically delineated into phases or time periods (hereinafter referred to as period or periods) that differentiate manpower requirements and undistributed costs. In order to differentiate between License Termination, Spent Fuel and Greenfield elements of the entire decommissioning scope of work, EnergySolutions has established a Work Breakdown Structure (WBS) and cost accounting system to treat each element as a subproject. Accordingly, the overall project schedule is divided into interrelated periods with major milestones defining Page 11 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 the beginning and ending of each period. The major milestones also serve as the basis for integrating the periods of the three subprojects. The License Termination and Greenfield project periods are scheduled sequentially while the Spent Fuel periods occur in parallel. 3.3 Decommissioning Staff EnergySolutions' philosophy towards decommissioning is to assume the project will be performed in an efficiently planned and executed manner using project personnel experienced in decommissioning. EnergySolutions assumes that the decommissioning will be performed by a highly experienced and qualified Decommissioning General Contractor (DGC), with oversight and management of the decommissioning operations performed by DAEC staff. It was also assumed that DAEC staff would be supplemented by professional consulting engineering, particularly in the planning and preparation phase. EnergySolutions analyzed the DAEC operational staff and developed a site-specific staffing plan. The DAEC existing salary structure was then used as the basis for calculating DAEC staff labor costs. EnergySolutions used industry data to develop DGC salary costs. Staffing levels, for both staffing plans and for each project period, are based on the AIF guidelines and industry experience. The sizes of the staffs are varied in each period in accordance with the requirements of the work activities. DAEC staffing has been organized into the following departments or functional groups:

           " Administration
           " Engineering

• Health Physics
• Management
• Plant Maintenance
• Plant Operations
• Quality Assurance
• Security Administration
• Security Guard Force
• Waste Operations

           " Fuel Pool Maintenance and Operation Staff
           " Additional Staff for Spent Fuel Shipping
           " DGC Staff Page 12 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 3.4 Waste Disposal Waste management costs comprise .a significant portion of the decommissioning cost estimate. Additionally, limited future access to disposal sites licensed for receipt of Class B and C wastes introduces a significant level of uncertainty with respect to the appropriateness of using existing rate structures to estimate disposal costs of these wastes. EnergySolutions' approach to estimating waste disposal costs is discussed in the following paragraphs. Waste Classification Regulations governing disposal of radioactive waste are stringent in order to ensure control of the waste and preclude adverse impact on public health and safety. At present, low-level radioactive waste (LLRW) disposal is controlled by NRC Regulation 10 CFR 61 (Ref. No. 4), which went into effect in December, 1983. This regulation stipulates the criteria for the establishment and operation of shallow-land LLRW burial facilities. Embodied within this new regulation are criteria and classifications for packaging LLRW such that it is acceptable for burial at licensed LLRW disposal sites. For each waste classification, 10 CFR 61 stipulates specific criteria for physical and chemical properties that the LLRW must meet in order to be accepted at a licensed disposal site. The LLRW disposal criteria of 10 CFR 61 require that LLRW generators determine the proportional amount of a number of specific radioactive isotopes present in each container of disposable LLRW. This requirement for isotopic analysis of each container of disposable LLRW is met by employing a combination of analytical techniques such as computerized analyses based upon scaling factors, sample laboratory analyses, and direct assay methods. Having performed an isotopic analysis of each container of disposable LLRW, the waste must then be classified according to one of the classifications (Class A, B, C or Greater Than Class C (GTCC)) as defined in 10 CFR 61. EnergySolutions' classification of LLRW resulting from decommissioning activities is based on AIF/NESP-036 (Ref. No. 2), NUREG/CR-0130 (Ref. No. 5), NUREG/CR-0672 (Ref. No. 6), and recent industry experience. The estimated curie content of the reactor vessel and internals at shutdown is derived from NUREG/CR-0130 for Pressurized Water Reactors (PWRs) and NUREG/CR-0672 for Boiling Water Reactors (BWRs) and adjusted for the different mass of components as well as the MWt rating and period of decay. Packaging Selection of the type and quantity of containers required for Class B and C wastes is based on the most restrictive of either curie content, dose-rate, container weight limit, or container volume limit. GTCC wastes from segmentation of the reactor vessel internals is packaged in fuel bundle canisters. The selection of container type for Class A waste is based on the transportation mode (rail, truck, barge, etc.) and waste form. The quantity. of Class A waste containers is determined by the most restrictive of either container weight limit or container volume limit. Large components, such as steam generators, pressurizers, and reactor recirculation pumps, are shipped as their own container with shielding as required. Container costs are obtained from manufacturers. Shielded transport cask and liner costs are obtained from the cask owners and operators. Page 13 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Transportation Transportation routes to processing and disposal facilities are determined based on available transportation modes (truck, rail, barge or combinations). Routes and distances are determined using the Transportation Routing Analysis Geographic Information System (TRAGIS) software developed by the Oak Ridge National Laboratory National Transportation Research Center (Ref. No. 7). Transportation costs for the selected routes and modes are obtained from vendor quotes or published tariffs whenever possible. Class A Disposal Options and Rates In accordance with the existing Life-of-Plant Disposal Agreement (Ref. No. 8), all Class A waste that meets the Clive facility waste acceptance criteria is to be disposed of at Clive. All reported waste disposal costs include packaging, transportation, and any applicable surcharges. Class B and C Disposal Options and Rates Currently, within the United States, there are only two commercial disposal facilities licensed to accept Class B and C LLRW: the Barnwell facility, operated by EnergySolutions in Barnwell, South Carolina, and the U.S. Ecology facility in Richland, Washington. However, Barnwell only accepts waste from states within the Atlantic Compact, and U.S. Ecology only accepts waste from states within the Northwest and Rocky Mountain Compacts. The Low-Level Waste Policy Act (LLWPA), passed by Congress in 1980, placed the responsibility of LLRW disposal in the hands of individual states. The LLWPA provided a six-year time frame within which each state was required to develop its own means for radioactive disposal. The LLWPA also provided for a group of states to form a compact, which could then establish the means for LLRW disposal on a regional basis. The intent of the LLWPA was to have new LLRW disposal sites in operation before January 1, 1986, therefore permitting closures of the three existing burial sites located in South Carolina, Washington, and Nevada. Since no new disposal sites were in operation by 1986, it is evident that the LLWPA failed to motivate the individual states to comply with its purpose. On January 15, 1986, Congress amended the LLWPA with passage of Public Law 99-240. In June of 1992, the U.S. Supreme Court ruled that the provisions of the amendment requiring any state to take title to the waste of its generators, if that state had not met its program milestones dates, were unconstitutional. The Supreme Court's invalidation of the "take title" provision has contributed to a lack of significant progress by many States in coming to grips with the problem. The question then becomes: what disposal rate is to be used in the decommissioning cost estimate for Class B and C LLRW and where is it to go? Since the cost estimate is based on current or present day dollars, the disposal cost for Class B and C LLRW should be equivalent to the cost that would be incurred if a new disposal facility were to be licensed and begin operations today. EnergySolutions has reviewed several studies developed in an attempt to quantify the disposal costs associated with a new disposal facility constructed in today's environment. Based Page 14 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 on this review, it is EnergySolutions' belief that Class B and C LLRW disposal rates based on the published base rate and surcharge structure for the Barnwell facility is the most reasonable approach. This approach is also based on the fact that NRC requires utilities to update their decommissioning cost estimates every five years so that changes in disposal options and costs can be taken into account. Greater Than Class C (GTCC) Wastes identified as 10 CFR 61 Class A, B, and C may be disposed at a near-surface disposal facility. Certain components are highly activated and may exceed the radionuclide concentration limitations for 10 CFR 61 Class C waste. In accordance with 10 CFR 61, these components cannot be disposed of in a near-surface LLRW disposal facility and must be transferred to a geologic repository or a similar site approved by the NRC. Highly activated sections of the reactor vessel internals will result in GTCC waste. Presently, a facility does not exist for the disposal of wastes exceeding 10 CFR 61 Class C limitations. EnergySolutions assumes that the DOE will accept this waste at the Yucca Mountain repository facility along with spent fuel. However, unlike spent fuel, the disposal cost is not addressed by DOE's 1-mill/kWhr surcharge. Therefore, EnergySolutions estimates a GTCC waste disposal cost based upon the maximum curie surcharges currently in effect at Barnwell. EnergySolutions assumes that the GTCC waste will be packaged in fuel bundle canisters, either stored in the fuel pool or dry storage containers, and be shipped to Yucca Mountain by DOE along with the spent fuel. Additionally, EnergySolutions assumes shipping costs for GTCC waste to be equivalent to the commercial cost of shipping a Type B licensed, shielded cask such as the CNS 8-120B cask which is owned and operated by EnergySolutions. Non-Radioactive Non-Hazardous Waste Disposal EnergySolutions assumes that recyclable, non-radioactive scrap metal resulting from the decommissioning program will be removed from the site by a scrap metal dealer at no cost to the project. Concrete debris is assumed to be processed by size reduction, with removal of structural reinforcing steel, and used on site as engineered fill for voids. All other demolition debris is removed from the site and disposed of at a local construction debris landfill. Hazardous and Industrial Waste Disposal Uncontaminated lead shielding remaining after shutdown was assumed to be removed from its installed locations and shipped offsite by entities having a need for the material. The entities receive the lead at no charge in return for providing the removal and shipping services. In accordance with information furnished by FPLE seven percent of insulated systems in. radiologically controlled areas are assumed to contain asbestos, therefore; the decommissioning cost estimate includes a line item for asbestos abatement. The decommissioning estimate also includes an estimate for hazardous and industrial waste disposal based on information provided in the "DAEC 2007 Hazardous Waste Report." The cost of hazardous and industrial waste disposal includes FPLE's estimated cost for closure of Resource Conservation and Recovery Act (RCRA) storage area. Page 15 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 3.5 Final Status Survey The cost of performing a final status survey (FSS) is based on NUREG-1575, "Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM)" (Ref. No. 9). Estimates of MARSSIM Class I, II and III survey designations are based on radiological characterization data furnished by DAEC and assumptions regarding contamination resulting from small and large component removal activities. The FSS activity cost calculation includes the in-place remote survey of underground metal and concrete pipe, soil, and groundwater sampling and analysis. Estimated costs for NRC and Oak Ridge Institute for Science and Education (ORISE) verification are also included, and the NRC review period is incorporated into the project schedule. 3.6 Contingency Contingencies are applied to cost estimates primarily to allow for unknown or unplanned occurrences during the actual program, e.g. increased radioactive waste materials volumes over that expected; equipment breakdowns; weather delays; labor strikes, etc. This is consistent with the definition provided in the DOE Cost Estimating Guide, DOE G 430.1-1, 3-28-97 (DOE G) (Ref. No. 10): Contingency "Covers costs that may result from incomplete design, unforeseen and unpredictable conditions, or uncertainties within the defined project scope. The amount of contingency will depend on the status of design, procurement, and construction; and ,the complexity and uncertainties of the component parts of the project. Contingency is not to be used to avoid making an accurate assessment of expected costs." EnergySolutions determines site-specific contingency factors to be applied to each estimate based on industry practices. The DOE has established a recommended range of contingencies as a function of completeness of program design, DOE G. The ranges are: Contingency Range Type of Estimate as a % of Total Estimate Planning Phase Estimate 20-30 Budget Estimate 15-25 Title I (Preliminary Design Estimate) 10-20 Title II (Definitive Design Estimate) 5-15 EnergySolutions' approach to assigning appropriate contingency rates is based on adaptations of published values for the specific decommissioning activities. One source for such published information is AIF/NESP-0036 "Guidelines for Producing Nuclear Plant Decommissioning Cost Estimates" (AIF) (Ref. No. 2). This document identifies contingencies for activities specific to a nuclear power plant decommissioning, such as reactor internals removal. The contingencies presented in this document are based on the assumption that the estimated costs are optimistic; therefore, the published contingencies are greater than they would be if the estimated costs were most probable. With the exception of the system decontamination, reactor vessel and reactor internals removal, and disposal, the contingencies presented in AIF are consistent with the values presented in DOE G 430.1-1 for a Budget/Title I estimate. The system decontamination, reactor vessel and reactor internals removal, and disposal contingencies are significantly higher than the ranges identified by the DOE, even for a planning phase document. This is due to the unique nature of these activities and the relatively small amount of historical data available at the time the AIF document was written. Page 16 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 EnergySolutions has developed contingencies specific to decommissioning estimates utilizing the information presented in AIF and consistent with DOE G. The decommissioning costs generated by EnergySolutions are considered most probable and, as such, the contingencies presented in AIF were reduced for each category of costs. There have also been a number of large-scale decommissioning projects since AIF was published, providing some historical information that can be used in preparing current estimates. This allows for additional reduction in contingency costs. The following table provides a summary of contingency values used in EnergySolutions' estimates where the plant structures, systems, and major component material inventories are well defined, as with this study. Package Material & Ship & Category Labor E quipment Bury Other Engineering, Utility & DGC 13% Contaminated components/Concrete 23% 23% 23% Clean components 13% 23% 13% Reactor Vessel and Reactor Internals 50% 23% 25% Other 15% A reactor decommissioning program will be conducted under an NRC-approved Quality Assurance Program which meets the requirements of 10 CFR 50, Appendix B, of the Code of Federal Regulations. However, the development of the quality assurance program, the performance of work under that program, and the effort required to ensure compliance with the program, is already included in the detailed cost estimate. Therefore, EnergySolutions does not include quality assurance as an element of the contingency allowance. The same is true for contamination. Where radioactive contamination or activated materials are dealt with, the EnergySolutions unit cost factors and associated calculations fully reflect the cost impact of that material, and a separate contingency is not required specifically due to working with contamination. 3.7 Cost Reporting Total project costs are aggregated from the distributed activity and undistributed costs into the following categories - Labor, Materials and Equipment, Waste Disposal, and Other costs. Other costs include property taxes, insurance, license fees, permits, and energy. Waste disposal costs are the summation of packaging, transportation, base disposal rate, and any applicable surcharges. Health physics (HP) supplies and small tool costs are calculated as a component of each distributed activity cost and included in the category of Material and Equipment, with the exception that HP supplies for DAEC HP staff are calculated and reported as an undistributed line item. A line item specific contingency is then calculated for each activity cost element. Page 17 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 4.0 SITE SPECIFIC TECHNICAL APPROACH 4.1 Facility Description DAEC is a nuclear powered electrical generating facility consisting of one BWR located on a site near Palo in Linn County, Iowa. The plant site comprises approximately 500 acres adjacent to the Cedar River approximately 2.5 miles northeast of the Village of Palo, Iowa. The nuclear system includes a single-cycle, forced-circulation, General Electric (GE) BWR producing steam for direct use in the steam turbine. The nuclear steam supply system (NSSS) and the turbine-generator were furnished by GE. The balance of plant was designed and constructed by Bechtel Power Corporation (Bechtel) as architect engineer and constructor. The unit was originally designed, analyzed, and licensed for a steady-state core power of 1658 MWt, although the plant Technical Specifications restricted operation to a rated power of 1593 MWt. In 1985, the Technical Specifications were amended to allow the DAEC to operate at a steady-state power level of 1658 MWt (License Amendment #115). Then, in 2001, the rated power level was increased again to 1912 MWt (License Amendment #243). The current shutdown date is February 21, 2014. Spent fuel assemblies are stored in the spent fuel storage racks in the fuel pool or may, after appropriate decay, be transferred to an ISFSI for interim onsite storage. The DAEC has been authorized by NRC to increase the storage capacity of the DAEC spent fuel pool to 2829 assemblies. In addition, a Cask Pit is also licensed to contain a rack with storage capacity of 323 assemblies. The Cask Pit rack is used as a means to retain full-core offload capability after such capacity is exhausted in the spent fuel pool. The DAEC may or may not exercise this option in the future. The re-rack project of 1994 increased the spent fuel pool capacity to 2411 assemblies. Subsequent re-rack projects will be undertaken only if the DAEC chooses to do so after having considered all other practicable options. There is an ISFSI on site that houses 10 CFR 72 licensed spent fuel storage systems that can provide interim on-site storage of spent fuel, high-level radioactive waste, and reactor-related GTCC waste. Appendix A provides a list of the DAEC systems and structures included in the material inventory for this study. 4.2 Decommissioning Periods for Scenario 1 The project periods defined for Scenario 1 (Base Case, DECON) consist of five License Termination periods, four Spent Fuel Management periods, and two Greenfield periods. The License Termination periods and Spent Fuel Management periods occur simultaneously. The Greenfield periods follow the License Termination periods sequentially. The project periods defined for this site-specific study and the major activities performed during each period are as follows: Page 18 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 License Termination Decon Pd 1 - Decommissioning Planning Prior to Shutdown

          "  Preparation of Decommissioning Licensing Documents
          "  Decommissioning Planning and Design
          "  Prepare Integrated Work Sequence and Schedule
          "  Preparation of License Termination Plan
          "  Select Decommissioning General Contractor
          "  Design and License Interim Storage Facility for Greater than Class A Waste Decon Pd 2 - Site Modifications and Preparations
          "  Perform Baseline Radiation Survey
          "  Construct Interim Storage Facility for Greater than Class A Waste
          "  Perform Primary System Decontamination
          "  Flush and Drain Nonessential Systems
          "  Modify Containment Access and Implement Cold and Dark
          "  Design, Specify, and Procure Special Items and Materials N  Asbestos Abatement Decon Pd 3 - Maior Component Removal
          "  Reactor Pressure Vessel and Internals Removal and Disposal
          "  NSSS Removal and Disposal
          "  Turbine Generator and Condenser Removal and Disposal
          "  Nonessential Systems Removal and Disposal Decon Pd 4 - Balance of Plant Decontamination
          "  Removal and Disposal of Spent Fuel Racks
          "  Drain Spent Fuel Pool
          "  Spent Fuel Pool Island Equipment Removal and Disposal
          "  Removal and Disposal of Remaining Plant Systems
          "  Decontaminate Plant Structures
          "  Perform Final Status Survey
          "  Prepare Dismantling Program Final Report
          "  Partial Part 50 License Termination Decon Pd 5 - Interim Waste Storage Facility Operation M  Transport and Dispose of Waste in Facility M  Perform FSS of Facility w  Clean Demolition of Facility Spent Fuel Management Dry Pd 1 - Fuel Pool Island Design
          " Design Spent Fuel Support System Modifications
          " Design Control Room Relocation

• Design Spent Fuel Storage Security Modifications Page 19 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Dry Pd 2 - Spent Fuel Cooling and Transfer to Da Storage

            " Install Spent Fuel Pool System Modifications
            " Implement Control Room Modifications
            " Implement Spent Fuel Pool Security Modifications
            " Purchase Dry Storage Modules Dry Pd 3 - Dry Storage During Decommissioning
            " Maintenance and Inspection of ISFSI
            " Spent fuel shipments to DOE Dry Pd 4 - Dry Storage Only
            " Maintenance and Inspection of ISFSI
            " Continued spent fuel shipments to DOE Dry Pd 5 - ISFSI Decommissioning

• Horizontal Storage Module Verification Survey

            " Preparation of Final Report on Decommissioning and NRC review
            " Clean Demolition of ISFSI
            " Part 50 License Termination Greenfield Gm Pd 1 - Clean Building Demolition
            " Install temporary structures
            " Demolition of all permanent structures Gm Pd 2 - Site Restoration
            " Remove Temporary Structures
            " Finish Grading and Seeding 4.3     Decommissioning Periods for Scenario 2 The project periods defined for Scenario 2 (SAFSTOR) consist of eleven License Termination periods, four Spent Fuel Management periods, and two Greenfield periods. The License Termination periods and Spent Fuel Management periods occur simultaneously. The Greenfield periods follow the License Termination periods sequentially. The project periods defined for this site-specific study and the major activities performed during each period are as follows:

License Termination SAFSTOR Pd 1 - SAFSTOR Planning Prior to Shutdown

            " Preparation of SAFSTOR Licensing Documents
            " SAFSTOR Planning and Design
            " Prepare Integrated SAFSTOR Work Sequence and Schedule
            " Preparation of SAFSTOR Plan
            " Select SAFSTOR General Contractor Page 20 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 SAFSTOR Pd 2 - SAFSTOR Preparations Following Shutdown

          " Procure Non-Engineered Standard Equipment
          " Perform pre-SAFSTOR Baseline Radiation Survey
          " Perform Primary System Decontamination
          " Flush and Drain Nonessential Systems
          " General Area Cleanup
          " Asbestos Abatement
          " Prepare SAFSTOR Report SAFSTOR Pd 3 - SAFSTOR Preparation Delay During Spent Fuel Pool Operations

• Surveillance and Maintenance SAFSTOR Pd 4 - Completion of SAFSTOR Preparations

          " Drain Spent Fuel Pool

• Flush and Drain Remaining Systems

          " Spent Fuel Pool Island Equipment Removal and Disposal
          " Secure Site SAFSTOR Pd 5 - Dormancy with Interim Waste Storage and Dry Spent Fuel Storage

• Surveillance and Maintenance

          " Transport and Dispose of Greater Than Class A Waste in Interim Storage SAFSTOR Pd 6 - Dormancy with Dry Storage

• Surveillance and Maintenance SAFSTOR Pd 7 - Dormancy Only
• Surveillance and Maintenance SAFSTOR Pd 8 - Decommissioning Planning During Dormancy

          " Preparation of Decommissioning Licensing Documents
          " Decommissioning Planning and Design
          " Select Decommissioning General Contractor
          " Plan Site Revitalization
          " Prepare Integrated Work Sequence and Schedule
          " Preparation of License Termination Plan SAFSTOR Pd 9 - Dismantlement Site Modifications and Preparations
          " Revitalize Infrastructure and Re-power Site
          " Perform Post-SAFSTOR Baseline Radiation Survey
          " Modify Containment Access
          " Design, Specify, and Procure Special Items and Materials SAFSTOR Pd 10 - Maior Component Removal

• Reactor Pressure Vessel and Internals Removal and Disposal

          " NSSS Removal and Disposal
          " Turbine Generator and Condenser Removal and Disposal
          " Systems Removal and Disposal
          " Removal and Disposal of Spent Fuel Racks Page 21 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 SAFSTOR Pd 11 - Site Decontamination

          " Decontaminate Plant Structures
          " Perform Final Status Survey
          " Preparation of Final Report on Dismantling
          " Partial Part 50 License Termination Spent Fuel Management Dry Pd 1 - Fuel Pool Island Design
          " Design Spent Fuel Support System Modifications
          " Design Control Room Relocation
          " Design Spent Fuel Storage Security Modifications Dry Pd 2 - Spent Fuel Cooling and Transfer to Dry Storage
          " Install Spent Fuel Pool System Modifications
          " Implement Control Room Modifications
          " Implement Spent Fuel Pool Security Modifications
          " Purchase Dry Storage Modules Dry Pd 3 - Dry Storage During Dormancy
          " Maintenance and Inspection of ISFSI
          " Spent fuel shipments to DOE Dry Pd 4 - ISFSI Decommissioning
          " Horizontal Storage Module Verification Survey
          " Preparation of Final Report on Decommissioning and NRC review

• Clean Demolition of ISFSI

          " Part 50 License Termination Greenfield Gm Pd 1 - Clean Building Demolition N Demolition of all permanent structures Gm Pd 2 - Site Restoration
          " Remove Temporary Structures
          " Finish Grading and Seeding 4.4     Decommissioning Periods for Scenario 3 The project periods defined for Scenario 3 (DECON with license extension) consist of four License Termination periods, four Spent Fuel Management periods, and two Greenfield periods.

The License Termination periods and Spent Fuel Management periods occur simultaneously. The Greenfield periods follow the License Termination periods sequentially. The project periods defined for this site-specific study and the major activities performed during each period are as follows: Page 22 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 License Termination Decon Pd 1 - Decommissioning Planning Prior to Shutdown

          " Preparation of Decommissioning Licensing Documents
          " Decommissioning Planning and Design
          " Prepare Integrated Work Sequence and Schedule
          " Preparation of License Termination Plan
          " Select Decommissioning General Contractor Decon Pd 2 - Site Modifications and Preparations
          "   Perform Baseline Radiation Survey
          "   Perform Primary System Decontamination
          "   Flush and Drain Nonessential Systems
          "   Modify Containment Access and Implement Cold and Dark
          "   Design, Specify, and Procure Special Items and Materials
          "   Asbestos Abatement Decon Pd 3 - Maior Component Removal
          "   Reactor Pressure Vessel and Internals Removal and Disposal
          "  NSSS Removal and Disposal
          "   Turbine Generator and Condenser Removal and Disposal
          "  Nonessential Systems Removal and Disposal Decon Pd 4 - Balance of Plant Decontamination
          "   Removal and Disposal of Spent Fuel Racks
          "   Drain Spent Fuel Pool
          "   Spent Fuel Pool Island Equipment Removal and Disposal
          "   Removal and Disposal of Remaining Plant Systems
          "   Decontaminate Plant Structures
          "   Remediate Soil Contamination
          "   Perform Final Status Survey
          "   Prepare Dismantling Program Final Report

• Partial Part 50 License Termination Spent Fuel Management Dry Pd I - Fuel Pool Island Design
• Design Spent Fuel Support System Modifications
• Design Control Room Relocation
• Design Spent Fuel Storage Security Modifications Dry Pd 2 - Spent Fuel Cooling and Transfer to Dry Storage

          " Install Spent Fuel Pool System Modifications
          " Implement Control Room Modifications
          " Implement Spent Fuel Pool Security Modifications
          " Purchase Dry Storage Modules Dry Pd 3 - Dry Storage During Decommissioning

• Maintenance and Inspection of ISFSI Page 23 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 0 Spent fuel shipments to DOE Dry Pd 4 - Dry Storage Only

           " Maintenance and Inspection of ISFSI
           " Continued spent fuel shipments to DOE Dry Pd 5 - ISFSI Decommissioning
           " Horizontal Storage Module Verification Survey
           " Preparation of Final Report on Decommissioning and NRC review
           " Clean Demolition of ISFSI
           " Part 50 License Termination Greenfield Gmr Pd 1 - Clean Building Demolition
           " Install temporary structures
           " Demolition of all permanent structures Gm Pd 2 - Site Restoration
           " Remove Temporary Structures

• Finish Grading and Seeding 4.5 Decommissioning Periods for Scenario 4 The project periods defined for Scenario 4 (SAFSTOR with license extension) consist of ten License Termination periods, four Spent Fuel Management periods, and two Greenfield periods.

The License Termination periods and Spent Fuel Management periods occur simultaneously. The Greenfield periods follow the License Termination periods sequentially. The project periods defined for this site-specific study and the major activities performed during each period are as follows: License Termination SAFSTOR Pd 1 - SAFSTOR Planning Prior to Shutdown

           " Preparation of SAFSTOR Licensing Documents
           " SAFSTOR Planning and Design
           " Prepare Integrated SAFSTOR Work Sequence and Schedule

• Preparation of SAFSTOR Plan

           " Select SAFSTOR General Contractor SAFSTOR Pd 2 - Site Preparations Following Shutdown
           " Procure Non-engineered Standard Equipment
           " Perform pre-SAFSTOR Baseline Radiation Survey
           " Perform Primary System Decontamination

• Flush and Drain Nonessential Systems

           " General Area Cleanup
           " Asbestos Abatement
           " Prepare SAFSTOR Report Page 24 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 SAFSTOR Pd 3 - SAFSTOR Preparation Delay During Spent Fuel Pool Operations

• Surveillance and Maintenance SAFSTOR Pd 4 - Completion of SAFSTOR Preparations 0 Drain Spent Fuel Pool N Spent Fuel Pool Island Equipment Removal and Disposal 0 Secure Site SAFSTOR Pd 5 - Dormancy with Dry Storage 0 Surveillance and Maintenance SAFSTOR Pd 6 - Dormancy Only
• Surveillance and Maintenance SAFSTOR Pd 7 - Decommissioning Planning During Dormancy

           " Preparation of Decommissioning Licensing Documents
           " Decommissioning Planning and Design
           " Select Decommissioning General Contractor
           " Plan Site Revitalization
           " Prepare Integrated Work Sequence and Schedule
           " Preparation of License Termination Plan SAFSTOR Pd 8 - Dismantlement Site Modifications and Preparations
           " Revitalize Infrastructure and Re-power Site
           " Perform Post-SAFSTOR Baseline Radiation Survey

• Modify Containment Access

           " Design, Specify, and Procure Special Items and Materials SAFSTOR Pd 9 - Major Component Removal
           " Reactor Pressure Vessel and Internals Removal and Disposal
           " NSSS Removal and Disposal

• Turbine Generator and Condenser Removal and Disposal

           " Systems Removal and Disposal
           " Removal and Disposal of Spent Fuel Racks SAFSTOR Pd 10 - Site Decontamination 0 Decontaminate Plant Structures

• Perform Final Status Survey E Preparation of Final Report on Dismantling 0 Partial Part 50 License Termination Spent Fuel Management Dry_ Pd 1 - Fuel Pool Island Design

           " Design Spent Fuel Support System Modifications

• Design Control Room Relocation

           " Design Spent Fuel Storage Security Modifications Page 25 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Dry Pd 2 - Spent Fuel Cooling and Transfer to Dry Storage

          " Install Spent Fuel Pool System Modifications
          " Implement Control Room Modifications E Implement Spent Fuel Pool Security Modifications
          " Purchase Dry Storage Modules Dry Pd 3 - Dry Storage During Dormancy
          " Maintenance and Inspection of ISFSI
          " Continued spent fuel shipments to DOE Dry Pd 4 - ISFSI Decommissioning
          " Horizontal Storage Module Verification Survey
          " Preparation of Final Report on Decommissioning and NRC review
          " Clean Demolition of ISFSI
          " Part 50 License Termination Greenfield Gm Pd 1 - Clean Building Demolition

• Demolition of all permanent structures Gm Pd 2 - Site Restoration

          " Remove Temporary Structures
          " Finish Grading and Seeding 4.6     Decommissioning Staff For this study, EnergySolutions developed staffing based on the assumption that decommissioning will be performed by an experienced and qualified DGC, with oversight and management of the decommissioning operations performed by DAEC staff. It is also assumed that DAEC staff is supplemented by professional consulting engineering, particularly in the planning and preparation phase. The sizes of the staffs are varied in each period in accordance with the requirements of the work activities. Details on the staff levels by functional group during each period are provided in Section 6.0 for each scenario.

4.7 Spent Fuel Management Staff The largest spent fuel staff occurs while the fuel pool is operational during the minimum cooling period and the fuel assemblies are being transferred to either the DOE repository or dry storage. Once all spent fuel has been removed from the spent fuel pool, the staff is reduced. During spent fuel pool operations and the dry storage period, the full-time spent fuel management staff is supplemented with part-time staff to support fuel movements. Details on the staff levels by functional group during each period are provided in Section 6.0 for each scenario. Page 26 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 4.8 Spent Fuel Shipments The spent fuel shipment schedules for each scenario are based on information from FPLE regarding existing fuel inventory, planned transfers to dry storage, planned off-loads during outages, the DOE shipment schedule, and the full core off-load. The spent fuel shipping schedules are also based, in part, on the DOE's "Acceptance Priority Ranking & Annual Capacity Report," dated July 2004 (Ref. No. 11). Spent fuel shipping schedules for each scenario are provided in Appendix B. Page 27 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 5.0 BASES OF ESTIMATE AND KEY ASSUMPTIONS The bases of and key assumptions for this site-specific decommissioning estimate are presented below:

1. All cost data used in this study is current as of 2008 or has been escalated to 2008 dollars. Totals and subtotals have been rounded to significant figures.

2. The decommissioning will be performed under the current regulations. These regulations require a Post-Shutdown Decommissioning Activities Report (PSDAR) to be submitted prior to, or within, two years after permanent shutdown. In addition, a certificate of permanent cessation of operations must be submitted to the NRC within 30 days of permanent cessation of operations. Certification of the final core off-load must also be submitted to the NRC upon completion of this activity. Ninety days after the NRC receives the PSDAR and after submittal of both certifications, major decommissioning activities that meet the criteria of 10 CFR Part 50.59 may be performed, provided the NRC does not notify DAEC of any deficiencies.

3. The decommissioning will be performed using currently available technologies.

4. EnergySolutions developed prompt dismantlement (DECON) and delayed dismantlement (SAFSTOR) project schedules based on a shutdown date of February 21, 2014 for Scenarios l and 2. For Scenarios 3 and 4, with a 20 year license extension, a shutdown date of February 21, 2034 was used.

5. A DOE repository is assumed to exist by an opening date of January 1, 2025.

6. This estimate's material inventory is based on EnergySolutions takeoffs from the site drawings and information furnished by FPLE.

7. All transformers on site following shutdown are assumed to be PCB-free.

8. No PCBs will be on site at shutdown.

9. Clean scrap metal is assumed to be recycled at no cost to the project. Concrete debris is assumed to be processed by size reduction, with removal of structural reinforcing steel, and used on site as engineered fill for voids. All other demolition debris is removed from the site and disposed of at a local off-site construction landfill.

10. All scenarios are based on final site restoration to Greenfield conditions, in which all existing and proposed structures, with the exception of the switchyard, will be removed.

Clean demolition costs are based on structures removal to three feet below grade. Clean topsoil will be imported and placed on the top three feet. The entire disturbed area of the site is to be graded, to restore the natural grade to the extent possible, and seeded. Page 28 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0

11. Uncontaminated lead shielding remaining after shutdown was assumed to be removed from its installed locations and shipped offsite by entities having a need for the material. The entities receive the lead at no charge in return for providing the removal and shipping services.

12. No known areas of radiologically contaminated soil have been identified. Additionally, documented tritium levels in groundwater are below drinking water standards.

Therefore, no soil or groundwater remediation costs will be assumed. However, costs for environmental monitoring performed during decommissioning will include groundwater monitoring.

13. A budget for hazardous material is included in the estimate, based on the 2007 EPA report provided by FPLE. All other chemicals and hazardous materials present at shutdown are assumed to be removed and disposed of by the plant staff prior to decommissioning, as a normal part of plant operations.

14. DAEC provided information on the current amount of asbestos insulation on systems piping. It is assumed that asbestos not replaced during an outage and still remaining at shutdown will be limited to areas with higher dose rates. Therefore, this study considers that 7% of the insulation on contaminated and insulated piping will be asbestos, and disposed of as Class A waste.

15. All Class A waste is assumed to be disposed of at EnergySolutions' facility in Clive, Utah, in accordance with the existing Life-of-Plant Disposal Agreement between EnergySolutions and FPL Energy Duane Arnold, LLC dated January 2007. The following 2008 disposal rates will be applied:

Demolition Debris and Soil - $52.00/Cubic Foot plus 5% Utah taxes Oversized Debris - $100.00/Cubic Foot plus 5% Utah taxes Containerized Waste Facility - $193.00/Cubic Foot plus 12% Utah taxes Large Components - $260.00/Cubic Foot plus 5% Utah taxes Cask Shipments - $39,513/Cask

16. Class B, C and Greater-than-Class-C (GTCC) wastes disposal costs are based on the July 2008 published rates for the Barnwell facility, including applicable curie and dose rate surcharges.

17. It is assumed that all Class A low-level waste currently being accumulated on-site will be removed to a low-level waste processing and/or disposal facility prior to the end of the operating life of the plant. The disposition of such materials is assumed not to be a decommissioning cost.

18. GTCC waste generated from the segmentation of the reactor internals will be packaged in fuel bundle sized containers and stored on-site in NUHOMS canisters placed in horizontal storage modules (HSMs) at the ISFSI for final disposition at a DOE repository.

Page 29 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0

19. Vessel and internals curie estimates were derived from the values for the Reference BWR vessel and internals in NUREG/CR-0672 (Ref. No. 6). These values were adjusted for MWt rating, weight and decay period.

20. Scenarios 1 and 2 (existing license termination) assume that Class B and C waste generated during operations will be stored on site until 2025, at which time a facility licensed to dispose of Class B and C wastes will become available.

2-1. Scenarios 3 and 4 (license extension) assume that all Class B and C waste generated during operations, and wastes stored on site on an interim basis, will be disposed of prior to the end of the operating life of the plant. Therefore, the disposition of such materials is not assumed to be a decommissioning cost.

22. The spent fuel shipping schedules developed by EnergySolutions are based on data provided by FPLE. The shipping schedules assume a five year spent fuel cooling period prior to transfer to dry storage canisters or the DOE. The number of spent fuel assemblies shipped from the ISFSI to the DOE have been adjusted to full cask shipments, with residual allocations carried forward to subsequent years.

23. Spent fuel management costs include the purchase of NUHOMS-61BT dry storage canisters and HSMs required for spent fuel following shutdown, based on the requirements of each scenario. Costs of $695,662 per canister and $400,155 per HSM were assumed for this study.

24. The HSMs are assumed to have no activated concrete. The ISFSI demolition cost also assumes no activation or surface contamination of the HSMs.

25. Emergency Preparedness (FEMA) fees and Environmental Affairs costs are based on data furnished by FPLE and were adjusted by EnergySolutions to meet the requirements of each period based on the status of on-site spent fuel. The annual operating costs for these items are as follows:

FEMA fees - $1,016,289/year Environmental Affairs - $7,367/year

26. Annual property taxes in the amount of $10,000/year through the end of the project are included.

27. EnergySolutions has included the annual NRC 10 CFR 171.15 fees, for reactors in decommissioning, of $135,000/yr per unit until decommissioning is completed.

28. EnergySolutions has included the annual NRC 10 CFR 171.15 fees of $135,000/yr for on-site dry storage during all post-shutdown years with dry storage. EnergySolutions has assumed that the 10 CFR Part 50 license will be continued until all fuel is offsite.

29. Annual insurance premiums are based on 2008 data supplied by FPLE, and adjusted by EnergySolutions to meet the requirements of each period. The applicable 2008 premiums provided are as follows:

Page 30 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Nuclear Property - $508,159 Nuclear Liability - $687,577 Excess Liability - $973,058 Non-Nuclear Liability - $250,000

30. Supplies and services costs were calculated based on information provided by FPLE and adjusted by EnergySolutions to match the requirements of each period, based on staffing levels.

31. No severance costs have been included in this estimate in accordance with existing FPLE policy.

32. The decommissioning will be performed by a DGC under the management and supervision of DAEC staff. DAEC staff will be supplemented with a professional engineering consulting firm for planning and preparation, engineering design, and final status survey.

33. DAEC staff positions and average direct burdened salary data was supplied by FPLE.

These rates were current as of August 2008. An overhead rate of 43% was applied to the direct salaries to account for fringe benefits, overhead and payroll taxes.

34. Health Physics technicians used during vessel and internals removal will be supplied by DAEC staff.

35. DGC staff salaries, including overhead and profit, were determined by EnergySolutions and represent EnergySolutions' standard assumptions for these rates.

36. The professional personnel, used for the planning and preparation activities, and DGC personnel are assumed to be paid per diem at the rate of $114/day based on per diem rates in CONUS for Des Moines, Iowa.

37. Craft labor rates, for labor categories not furnished by FPLE, have been taken from the 2008 RS Means Labor Rates for the Construction Industry (Ref. No. 12), for Des Moines, Iowa. Since the skilled laborers are assumed to be supplied by the local union hall they will not be paid per diem.

38. This study has considered the impact of the September 11, 2001 terrorist attack on security force staffing and requirement. The security guard force included in this estimate has been sized accordingly.

39. This study follows the occupational exposure principles of As Low As Reasonably Achievable (ALARA) through the use of productivity loss factors that incorporate such items as the use of respiratory protection and personnel protective clothing. These factors increase the work duration and cost.

40. The costs of all required safety analyses and safety measures for the protection of the general public, the environment, and decommissioning workers are included in the cost estimates. This reflects the requirements of:

Page 31 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 10 CFR 20 Standards for Protection Against Radiation 10 CFR 50 Domestic Licensing of Production and Utilization Facilities 10 CFR 61 Licensing Requirements for Land Disposal of Radioactive Waste 10 CFR 71 Packaging of Radioactive Material for Transport 10 CFR 72 Licensing Requirements for the Independent Storage of Spent Nuclear Fuel and High-Level Radioactive Waste 29 CFR 1910 Occupational Safety and Health Standards 49 CFR 170-189 Department of Transportation Regulations Governing the Transport of Hazardous Materials Reg. Guide 1.159 Assuring the Availability of Funds for Decommissioning Nuclear Reactors

41. Activity labor costs do not include any allowance for delays between activities, nor is there any cost allowance for craft labor retained on site while waiting for work to become available.

Page 32 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 6.0 STUDY RESULTS BY SCENARIO The study results for the four scenarios analyzed are presented in the following sections. 6.1 Scenario 1 - Base Case This scenario is based on the following:

          "   DECON methodology.
          "   No license extension, with shutdown on February 21, 2014.
          "   Terminate spent fuel pool operation five years after permanent unit shutdown.
          "   Spent fuel will be stored at the existing ISFSI.

• Class B and C waste will be temporarily stored in an on-site interim waste storage facility to be built during decommissioning. Class B and C waste are assumed to be stored on-site until 2025, which is the assumed date a licensed facility would be available to receive these wastes.

          " The DOE Yucca Mountain repository, or other approved method of spent fuel disposition, will be available starting in 2025.

Spent Fuel Shipping Schedule The spent fuel shipment schedules for each scenario are based on information from FPLE and are also based, in part, on the DOE's "Acceptance Priority Ranking & Annual Capacity Report," dated July 2004 (Ref. No. 11). Spent fuel shipping schedules for each scenario are provided in Appendix B. The schedule for Scenario 1 includes the disposition of 2 GTCC waste containers. Spent fuel shipments to the DOE repository from the spent fuel pool will begin in 2027. In 2011, 610 spent fuel assemblies will be transferred to MPCs as required to maintain full-core off-load capacity. All spent fuel and GTCC will be removed from the ISFSI by 2054. Cost and Schedule Figure 6-1 is a summary project schedule. A detailed schedule is provided in Appendix C. Table 6-1 summarizes the period durations and total costs, including contingency, for License Termination, Spent Fuel, and Greenfield activities. A detailed cost table is provided in Appendix D, and a table of annual cash flows is provided in Appendix E. Appendix F provides an annual cash flow with the costs broken out by Labor, Equipment & Materials, Waste, Other, and Contingency categories. Project Staffing This scenario is based on the assumption that decommissioning will be performed by an experienced and qualified DGC, with oversight and management of the decommissioning, operations performed by DAEC staff. DAEC staffing levels, by organizational department and function, for each period are provided in Table 6-2. The DGC staffing levels, by organizational department and function, for each period are provided in Table 6-3. Page 33 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Waste Disposal Volumes Waste disposal is a significant element of the decommissioning project. The estimated cubic feet of waste are summarized as follows: Class A 377,714 Class B 1,866 Class C 756 GTCC 128 Waste disposal volumes and costs, itemized by packaging, transportation, surcharges and disposal costs by waste class and facility, are provided in Table 6-4. The waste disposal cost provided in Table 6-4 does not include contingency. Page 34 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Figure 6-1 DUANE ARNOLD ENERGY CENTER SCENARIO 1

SUMMARY

SCHEDULE Task-Na r -.................... .............. ..... T -7 _ __-_L ;L

       *I Spent         M~.
        .... Feel Manaegmnent      .....................       .    .  .        6/2212013   10/21/2054 pe..i Fueli Shippingto DOE Repository Begins                                     2/21/202                     .,                      212l:

Spent FPel Shipping Complete 2.2215* '21i. 212112014 8-Ir FoolI Pool late. ofDesign

• 2

                                                                                             --      *O19  *.                       . .  . . .   . . ..        .          .     ......       ..

D d - SpenuFe Cooling and Trt*nsf r to Dry Storage Dry Pd 3 - Dry Storage During Decommissioning 212112014 10121/2014 10/3012025 . W.i i

                                                                                                                      ..

i i E-:

                                                                                                                                      !    !     i , i   i i i i  i i  :  '                       l i i      i Dry - d 4-Dry Storage On.y                                                       _7/27/20530m~

21/82012 Dry Pd 5- ISFSI D nconmmissioning Licnsenn TerInatnelt i1030/2026 22112014 2121/2014 2121 Decon Pd 1 -Decommissioning Planning Prior to Sh utdown 21812012 212111204 Pid 2-Site Modlfiat~nslon nd Pureparottono ----

                           .floAo                                                           -1211 20 15 Pd -00.00 Motor Compo nent Rei o a]              .                            3/4/2019 fOcon Pd 4 - Balance of Plant Decontamination                         31"112019     11/7/2021.                    N Deconl Pd S - ntrmWe              SrgePolliity Operation,            5118/20i22 10D/30/2  025                               -

Grn Pd 1 - Clean Building Demolition 117/21121 iGnPd 2 - Site Restorllton 22412022 022 . ... .....----------- Page 35 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Table 6-1 Scenario 1 Cost and Schedule Summary (2008 Dollars in Thousands) P,:eriod No. , Period Desci ption Start End Years Total Cost License Termination (50.75(c)) Decon Pd 1 Decommissioning Planning and Design Prior to Shutdown 2/18/2012 2/21/2014 2.00 $22,704 Decon Pd 2 Site Modifications and Preparations 2/21/2014 12/1/2015 1.77 $96,555 Decon Pd 3 Major Component Removal 12/1/2015 3/4/2019 3.25 $231249 Decon Pd 4 Balance of Plant Decontamination 3/4/2019 1/7/2021 1.84 $99,858 Decon Pd 5 Interim Waste Storage Facility Operation 5/18/2022 10/30/2025 3.45 $45,333 Account Total 12.31 $495,699 Spent Fuel (50.54(bb)) Dry Pd 1 Fuel Pool Island Design 6/23/2013 2/21/2014 0.66 $1,256 Dry Pd 2 Spent Fuel Cooling and Transfer to Dry Storage 2/21/2014 2/21/2019 4.99 $129,721 Dry Pd 3 Dry Storage During Dormancy 2/21/2019 10/30/2025 6.68 $26,136 Dry Pd 4 Dry Storage Only 10/30/2025 7/27/2053 27.74 $113,846 Dry Pd 5 ISFSI Decommissioning 7/27/2053 10/21/2054 1.23 $7,274 Account Total 41.30 $278,233 Greenfield Gm Pd 1 Clean Building Demolition 1/10/2021 2/27/2022 1.13 $38,078 Gm Pd 2 Site Restoration 2/27/2022 5/21/2022 0.22 $2,632 Account Total 1.35 $40,710 Scenario Total $814,642 Page 36 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Table 6-2 Scenario 1 DAEC Staff Levels Aoministrarion .2! 21 2U U.2-Engineering 7.75 25 21 17 0.25 Health Physics 3.25 27 25 34 0.75 Management 2 2 2 Plant Maintenance 1.5 27 16 5 0.25 Plant Operations 3.75 31 32 17 Quality Assurance 5 3 1 Security Administration 0.5 2 2 3 Security Guard Force 3 12 12 12 1 Waste Operations 2.5 29 21 20 0.25 22.25 160 134 111 2.5 Spent Fuel - 50.54(bb) DAEC Staff Depart*new >i ,Dri Pd*' P Dr' P. Diy P D'y Pd Additional Staff for Spent Fuel Shipping 2 2 Administration 1.2 Engineering 0.75 1 1 1 Fuel Pool Maintenance and Operation Staff 26 Health Physics 4 4 1.5 Management 0.25 Plant Maintenance 0.25 2 2 Security Admin 5 5 5 0.5 Security Guard Force 50 5 5 5 1 81 19 19 9.45 Administration 9 8 Engineering 7 5 Health Physics 3 1 Management 2 1 Plant Maintenance 3 1 Quality Assurance 2 1 Security Admin Security Guard Force 5 5 32 23 Page 37 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Table 6-3 Scenario 1 DGC Staff Levels License Termination - 50.75(c) DGC Staff [ )econ% ~Deon Decon Dec:,on Dec~on

                     ~dI         Pirten    Pd 2*    PdJ 31  ~         Pd5 l

Administration 8 17 17 11 8 Engineering 5.5 16 16 9 5.5 Field Operations 2 11 11 8 2 Health Physics 5 23 35 19 5 Management 3 3 3 3 3 Quality Assurance 3 4 5 3 3 Waste Operations 2 16 16 26.5 76 103 69 26.5 Greenfield - DGC Staff

.epartmeht<
      .GPd                      (IM       G fPd Administration                        10        9 Engineering                           11        6 Field Operations                      10        5 Health Physics                         1         1 Management                             3        3 Qualit Assurance                       2        2 37       26 Page 38 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Table 6-4 Scenario 1 Waste Disposal Volumes (Cost Excludes Contingency - 2008 Dollars in Thousands) midsfast (1ack K'aih,egi Wast oltltB ((T Volne ((T) ' (YAost C osPt ot t st< Di~pwoal Cost Class B and C Facility Class B 191,340 1,866 3,223 $778,943 $474,600 $6,805,322 $1,852,615 $9,911,481 Class C 105,840 756 1,365 $903,000 $177,840 $5,264,805 $784,739 $7,130,384 GTCC 62,590 128 823 $0 $91,480 $14,924,178 $473,258 $15,488,915 359,770 2,750 5,411 $1,681,943 $743,920 $26,994,305 $3,110,612 $32,530,780 EnergySolutions Class A -Debris 13,091,971 222,569 224,005 $567,930 $2,365,025 $0 $12,230,627 $15,163,582 Class A - Oversized Debris 4,488,865 67,190 67,190 $47,153 $447,470 $0 $7,054,916 $7,549,539 Class A - CWF 2,808,407 38,430 38,489 $496,994 $3,846,607 $0 $8,319,692 $12,663,294 Class A- Large Component 3,715,042 49,526 66,049 $1,172,945 $3,429,086 $0 $18,031,466 $22,633,497 24,104,285 377,714 395,733 $2,285,023 $10,088,187 $0 $45,636,701 $58,009,911 Other Local Construction Debris Landfill 61,500,530 469,161 469,161 $0 $23,001 $0 $2,385,703 $2,408,705 Process for On-Site Fill 230,100,750 3,528,212 3,528,212 $0 $0 $0 $851,373 $851,373 Scrap Metal Recycler 161,197,811 1,100,763 1,100,763 $0 $354,635 $0 $0 $354,635 Grand Total 477,263,146 5,478,600 5,499,280 $3,966,966 $11,209,743 $26,994,305 $51,984,389 $94,155,403 Page 39 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 6.2 Scenario 2 - Base Case, Except SAFSTOR This scenario is identical to Scenario 1 (the Base Case) with the exception that the decommissioning alternative is a SAFSTOR rather than DECON methodology, and Class B and C waste generated during operations and SAFSTOR preparations will be stored in the existing Low Level Radwaste Storage Building until 2025, which is the assumed date a licensed facility would be available to receive these wastes. Spent Fuel Shipping Schedule The spent fuel shipping schedule for Scenario 2 is identical to Scenario 1. Due to the decay of activation products in the reactor internals over the SAFSTOR dormancy no GTCC waste is generated in this scenario. Cost and Schedule Figure 6-2 is a summary project schedule. A detailed schedule is provided in Appendix C. Table 6-5 summarizes the period durations and total costs, including contingency, for License Termination, Spent Fuel, and Greenfield activities. A detailed cost table is provided in Appendix D, and a table of annual cash flows is provided in Appendix E. Appendix F provides an annual cash flow with the costs broken out by Labor, Equipment & Materials, Waste, Other, and Contingency categories. Project Staffing This scenario is based on the assumption that decommissioning will be performed by an experienced and qualified DGC, with oversight and management of the decommissioning operations performed by DAEC staff. DAEC staffing levels, by organizational department and function, for each period are provided in Table 6-6. The DGC staffing levels, by organizational department and function, for each period are provided in Table 6-7. Waste Disposal Volumes Waste disposal is a significant element of the decommissioning project. The estimated cubic feet of waste are summarized as follows: Class A 379,944 Class B 1,287 Class C 884 Waste disposal volumes and costs, itemized by packaging, transportation, surcharges and disposal costs by waste class and facility, are provided in Table 6-8. The waste disposal cost provided in Table 6-8 does not include contingency. Page 40 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Figure 6-2 DUANE ARNOLD ENERGY CENTER SCENARIO 2

SUMMARY

SCHEDULE

                                                                                                                                                        . .    .        .      .. 1/1   . .     . . .  .

kl59jO. . . .. 2 3 Etmtt F-.I Shlpplttt. DtOE 8.thtat flg1

                                                                                                                                                                                            ?'i21 Dry Pd 2. Gp.10 FatI Coohlln   ,ttd Ttm.,t. W DryStth.. 9                             M~i114 0
                                                                                                                          -                          -       I                     Iiix
                                                                                                                                       . . . . . . . . . . . . .t.
        -ý    I0S     2 d.wOP0RP.It                    ttt.thd.
       -.- AFSOOR    Pd3 . AFSTQ8     Plwp~titt.        otomaDvdn,.W~tFueliWots        1 2-12074th 2 motitOSI qvY::     ,      ý ý ý :   ,

SAFOTOR Pd4. C-ttp.11-t 01SAFSTOR P-.6-~i~t SAFSIORPd5.-D Ot...VWth1-H., W.-t .. td StySpMnF- St...g -wm

                                                                                                      /2--2
             -SF IORP -d ttttt        WithDtS~tg                                                                               .lmtio1               . . . . i . . . . I ' ' l '

SAPSTOWO P87 Dt.tt.y t--t---- --- BAPS T01RPd lntshtt Dm.Alatt mettt.ty 2 sAPeoTREd-o: *,tt~t,..,t shit Mdcattt1nz.,a GAPSTOR 5AFSTOR PEd0.M.). C-tt-.ttt PdIT .51 O.tll tltIt R.tt-., iI~.~q 66.t7777 .um1 I~l,7 Om0tPa .ht..tt uwtw.idtg ttttF ww, Page 41 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Table 6-5 Scenario 2 Cost and Schedule Summary (2008 Dollars in Thousands)

>Penod No6:*                *       >*'PeriodDesn6iption                     Stat i   '    End    / Years   Total Cost License Termination (50.75(c))

SAFSTOR Pd 1 SAFSTOR Planning and Design Prior to Shutdown 2/18/2012 2/21/2014 2.00 $18,324 SAFSTOR Pd 2 SAFSTOR Preparations Following Shutdown 2/21/2014 12/3/2014 0.78 $41,214 SAFSTOR Pd 3 SAFSTOR Preparation Delay During Spent Fuel Operations 12/3/2014 2/21/2019 4.21 $7,554 SAFSTOR Pd 4 Completion of SAFSTOR Preparations 2/21/2019 12/17/2019 0.81 $12,896 SAFSTOR Pd 5 Dormancy With Interim Waste and Dry Spent Fuel Storage 12/17/2019 4/1/2025 5.28 $20,068 SAFSTORPd 6 Dormancy With Dry Storage 4/1/2025 2/21/2054 28.89 $41,845 SAFSTOR Pd 7 Dormancy Only 2/21/2054 6/1/2066 12.27 $28,269 SAFSTOR Pd 8 Decommissioning Planning During Dormancy 6/1/2066 2/19/2068 1.71 $24,773 SAFSTOR Pd 9 Dismantlement Site Modifications and Preparation 2/19/2068 9/9/2069 1.55 $111,149 SAFSTOR Pd 10 Major Component Removal 9/9/2069 9/7/2071 1.99 $191,919 SAFSTOR Pd 11 Site Decontamination 9/7/2071 5/23/2073 1.70 $81,422 Account Total 61.19 $579,393 Spent Fuel (50.54(bb)) Dry Pd 1 Fuel Pool Island Design 6/23/2013 2/21/2014 0.66 $1,256 Dry Pd 2 Spent Fuel Cooling and Transfer to Dry Storage 2/21/2014 2/21/2019 4.99 $129,721 Dry Pd 3 Dry Storage During Dormancy 2/21/2019 7/27/2053 34.42 $135,952 Dry Pd 4 ISFSI Decommissioning 7/27/2053 10/21/2054 1.23 $7,082 Account Total 41.30 $274,011 Greenfield Gm Pd I Clean Building Demolition 5/23/2073 7/10/2074 1.13 $38,155 Gm Pd 2 Site Restoration 7/10/2074 10/23/2074 0.28 $3,143 Account Total 1.41 $41,298 Scenario Total $894,702 Page 42 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Table 6-6 Scenario 2 DAEC Staff Levels License Termination - 50.75(c) DAEC Staff

                         %I.ýIS c5R SAFSTOR   SAF\[ý§OR~ 1AFSTO'R   SAEýSTOR -,SAFSTOR     SAFSTOR   'S,( iSTOR    I'q I01R' SA/FSTOR     SAFSTOR Neprt~n df~

I Pd 2 I'd3 P'd4 P5 I'd I'd 6 I' I'd 8 [)I M~9-~ 10 Pd 11 Administration 2.5 29 0.25 1.25 0.25 0.25 0.25 2.5 29 21 20 Engineering 7.75 25 0.25 3 0.25 0.25 0.25 7.75 25 21 17 Health Physics 3.25 27 0.75 7 0.75 0.75 0.75 3.25 27 25 34 Management 2 2 2 2 Plant Maintenance 1.5 27 0.25 7 0.25 0.25 0.25 1.5 27 16 5 Plant Operations 3.75 31 4 3.75 31 32 17 Quality Assurance 5 5 3 1 Security Administration 0.5 2 0.5 0.5 0.5 2 2 3 Security Guard Force 3 12 1 5 1 1 5 3 12 12 12 22.25 160 2.5 27.75 2.5 2.5 7 22.25 160 134 111 Page 43 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Table 6-6 Scenario 2 DAEC Staff Level (Continued) Spent Fuel - 50.54(bb) DAEC Staff Departmerit 1Dr Pd* Dr4Pd wDry3 Pd..>DrPd> 4 Additional Staff for Spent Fuel Shipping 2 Administration 1.2 Engineering 0.75 1 1 Fuel Pool Maintenance and Operation Staff 26 Health Physics 4 1.5 Management 0.25 Plant Maintenance 0.25 2 Security Admin 5 5 0.5 Security Guard Force 50 5 5 1 81 19 9.45 Greenfield - DAEC Staff Administration 9 8 Engineering 7 5 Health Physics 3 1 Management 2 1 Plant Maintenance 3 1 Quality Assurance 2 1 Security Admin 1 1 Security Guard Force 5 5 32 23 Page 44 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Table 6-7 Scenario 2 DGC Staff Levels License Termination - 50.75(c) DGC Staff

                         %I SAFT(-)R "SAFSTOR      SAF'STOR  ~SAFSTOR~  SAFS;TOR    SAFSTOR 3/4SAFSTOR(-   ý,\]FSO1      ~SFT 0R   S UESTORI    ,,,\FSTOR~

paLII4I 2P I P~d2'7 N d 6 Ill1 Pd4l S~ I'l' P'dl 10 Pd 11 Administration 8 17 8 8 17 17 11 Engineering 5.5 16 7 5.5 16 16 9 Field Operations 2 11 2 2 11 11 8 Health Physics 5 23 5 5 23 35 19 Management 3 3 3 3 3 3 3 Quality Assurance 3 4 3 3 4 5 3 Waste Operations 2 8 2 16 16 26.5 76 0 36 0 0 0 26.5 76 103 69 Greenfield - DGC Staff GmPd 1*mG Pdf Administration 10 9 Engineering 11 6 Field Operations 10 5 Health Physics 1 1 Management 3 3 Quality Assurance 2 2 37 26 Page 45 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Table 6-8 Scenario 2 Waste Disposal Volumes (Cost Excludes Contingency - 2008 Dollars in Thousands) WasiT& IFailt%&WP\ascClas olumet aCF)k VoLumeiCF) Nekwm i~ Surcharge 4 Base *Buial, T~otal acjynaýs ' Vil&s Volste(CF Volriml ranspooalo &ost ~ Cos t~g Pisposal Cost Class B and C Facility Class B 122,531 1,287 2,104 $207,315 $722,333 $4,226,706 $1,209,590 $6,365,943 Class C 168,430 884 2,015 $903,000 $745,693 $8,172,367 $1,158,424 $10,979,483 GTCC 290,961 2,171 4,119 $1,110,315 $1,468,026 $12,399,073 $2,368,013 $17,345,427 EnergySolutions Class A-Debris 13,304,744 224,683 226,652 $569,787 $2,382,954 $0 $12,375,127 $15,327,868 Class A - Oversized Debris 4,488,865 67,190 67,190 $47,153 $447,470 $0 $7,054,916 $7,549,539 Class A - CWF 2,808,407 38,430 38,489 $496,994 $3,846,607 $0 $8,319,692 $12,663,294 Class A -Large Component 3,746,792 49,642 66,425 $1,172,945 $3,562,890 $0 $18,134,004 $22,869,840 24,348,808 379,944 398,755 $2,286,880 $10,239,921 $0 $45,883,740 $58,410,540 Other Local Construction Debris Landfill 58,842,438 458,767 458,767 $0 $23,001 $0 $2,291,218 $2,314,220 Process for On-Site Fill 230,100,750 3,528,212 3,528,212 $0 $0 $0 $851,373 $851,373 Scrap Metal Recycler 161,197,811 1,100,763 1,100,763 $0 $354,635 $0 $0 $354,635 Grand Total 474,780,768 5,469,857 5,490,616 $3,397,195 $12,085,583 $12,399,073 $51,394,344 $79,276,195 Page 46 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 6.3 Scenario 3 - Base Case, Except License Extension This scenario is identical to Scenario 1 (the Base Case) with the exception of a 20 year license extension, and therefore no on-site interim waste storage facility is required for Class B and C waste. All legacy Class B and C waste generated during operations, and stored until a licensed facility is available to accept these wastes, is assumed to be disposed of during operations. Spent Fuel Shipping Schedule The spent fuel shipping schedule for Scenario 3 is provided in Appendix B. It includes the disposition of 2 GTCC waste containers. Spent fuel shipments to the DOE repository from the spent fuel pool will begin in 2027. During operations 1,281 spent fuel assemblies will be transferred to MPCs as required to maintain full-core off-load capacity. All spent fuel and GTCC will be removed from the ISFSI by 2067. Cost and Schedule Figure 6-3 is a summary project schedule. A detailed schedule is provided in Appendix C. Table 6-9 summarizes the period durations and total costs, including contingency, for License Termination, Spent Fuel, and Greenfield activities. A detailed cost table is provided in Appendix D, and a table of annual cash flows is provided in Appendix E. Appendix F provides an annual cash flow with the costs broken out by Labor, Equipment & Materials, Waste, Other, and Contingency categories. Project Staffing Staffing levels for each period of this case are the same as for Scenario 1. DAEC staffing levels, by organizational department and function, for each period are provided in Table 6-2. The DGC staffing levels, by organizational department and function, for each period are provided in Table 6-3. Waste Disposal Volumes Waste disposal is a significant element of the decommissioning project. The estimated cubic feet of waste are summarized as follows: Class A 377,596 Class B 1,866 Class C 540 GTCC 128 Waste disposal volumes and .costs, itemized by packaging, transportation, surcharges and disposal costs by waste class and facility, are provided in Table 6-10. The waste disposal cost provided in Table 6-10 does not include contingency. Page 47 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Figure 6-3 DUANE ARNOLD ENERGY CENTER SCENARIO 3

SUMMARY

SCHEDULE Finish -i 1:.11 1 16 17168 'Jhl 21 iilfi J~jl~533' Spent Fuel Management 61231203i3 10/23/2067142~227212331 . ____ Spent Fuel Shipping to DOE Repository in Progress 2/21/2034 2/21/2034 SpenIT Fuel shippi-n-g

                                    -Com-.-peI-ate                                 212312067    2/2312034
                                                                                                                                                                                    ?123 Dry Pd I - Fuel Pool Island Design                                   612312033 bry Pd      - Spent Fuel Cooling and Transfer to Dry Storage   I     2/2112034    212112039 Dry Pd 3- Dry Storage During Decoommissioning                        2/2112039    511812042              2/21 Dry PA4-Dry Storage Only------------------                            1824                                                        ...      m... I. -, I - . -

Dry Pd 5 - ISFSi Decommissioning 7128/2055 10R23/2067 lop License Termination 1 2/1812032 -S/26 W42 Unit I Shutdown 2/2112034 2/21/2034

                                                                                               -V21212634 Decon Pd 2 - Site Modifications and Preparations                     2121/2034    12/1/2035 3../412039 Deo d3-Major Component Removal                                12/112035     3511o20Q DBcon Pd 4 - Balance of Plant Decontamination                         3 VOW ninPid I - Cl-an Buldaing Demoiltion                      .         1.. 2041
              .. Pd.2. - Site- e*atoraetin.          ..                       -   24i/2 -42 Page 48 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Table 6-9 Scenario 3 Cost and Schedule Summary (2008 Dollars in Thousands) Period No. Pe~rtud DescriptiOrl ~Str Sdn End 'Years~ Total Cost License Termination (50.75(c)) Decon Pd I Decommissioning Planning and Design Prior to Shutdown 2/18/2032 2/21/2034 2.00 $21,605 Decon Pd 2 Site Modifications and Preparations 2/21/2034 12/1/2035 1.77 $97,547 Decon Pd 3 Major Component Removal 12/1/2035 3/4/2039 3.25 $261,821 Decon Pd4 Balance of Plant Decontamination 3/4/2039 1/7/2041 1.84 $101,773 Account Total 8.86 $482,746 Spent Fuel (50.54(bb)) Dry Pd I Fuel Pool Island Design 6/23/2033 2/21/2034 0.66 $1,256 Dry Pd 2 Spent Fuel Cooling and Transfer to Dry Storage 2/21/2034 2/21/2039 4.99 $114,599 Dry Pd 3 Dry Storage During Dormancy 2/21/2039 5/18/2042 3.23 $12,645 Dry Pd 4 Dry Storage Only 5/18/2042 7/28/2066 24.19 $99,295 Dry Pd ISFSI Decommissioning 7/28/2066 10/23/2067 1.23 $6,646 Account Total 34.30 $234,441 Greenfield Grn Pd 1 Clean Building Demolition 1/7/2041 2/24/2042 1.13 $38,078 Gm Pd 2 Site Restoration 2/24/2042 5/18/2042 0.22 $2,632 Account Total 1.35 $40,710 Scenario Total $757,891 Page 49 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Table 6-10 Scenario 3 Waste Disposal Volumes (Cost Excludes Contingency - 2008 Dollars in Thousands) I~t andea~BuCassia1h asteit (IJ -S)~t Volumeu (CF-)~Volum~e(CF) C oý;t ~ Cost7 oCst ' Cost. Disposal Cst Class B and C Facility Class B 179,852 1,866 3,223 $145,143 $1,277,588 $6,805,322 $1,852,615 $10,080,669 Class C 75,600 540 975 $0 $851,780 $3,760,575 $560,528 $5,172,882 GTCC 62,590 128 823 $0 $113,571 $14,924,178 $473,258 $15,511,006 318,042 2,534 5,021 $145,143 $2,242,939 $25,490,075 $2,886,401 $30,764,557 EnergySolutions Class A - Debris 13,091,735 222,451 223,888 $567,847 $2,364,227 $0 $12,224,196 $15,156,271 Class A - Oversized Debris 4,488,865 67,190 67,190 $47,153 $447,470 $0 $7,054,916 $7,549,539 Class A - CWF 2,808,407 38,430 38,489 $496,994 $3,846,607 $0 $8,319,692 $12,663,294 Class A - Large Component 3,715,042 49,526 66,049 $1,172,945 $3,429,086 $0 $18,031,466 $22,633,497 24,104,049 377,596 395,615 $2,284,940 $10,087,389 $0 $45,630,270 $58,002,600 Other Local Construction Debris Landfill 48,206,018 374,200 374,200 $0 $23,001 $0 $1,853,329 $1,876,331 Process for On-Site Fill 230,100,750 3,528,212 3,528,212 $0 $0 $0 $851,373 $851,373 Scrap Metal Recycler 161,197,811 1,100,763 1,100,763 $0 $354,635 $0 $0 $354,635 Grand Total 463,926,670 5,383,305 5,403,811 $2,430,084 $12,707,964 $25,490,075 $51,221,373 $91,849,496 Page 50 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 6.4 Scenario 4 - Base Case, Except SAFSTOR and License Extension This scenario is identical to Scenario 2 with the exception of a 20 year license extension, and therefore no on-site interim waste storage facility is required for Class B and C waste. Identical to Scenario 3 all legacy Class B and C waste generated during operations, and stored until a licensed facility is available to accept these wastes, is assumed to be disposed of during operations. Spent Fuel Shipping Schedule The spent fuel shipping schedule for Scenario 4 is identical to Scenario 3. Due to the decay of activation products in the reactor internals over the SAFSTOR dormancy no GTCC waste is generated in this scenario. Cost and Schedule Figure 6-4 is a summary project schedule. A detailed schedule is provided in Appendix C. Table 6-11 summarizes the period durations and total costs, including contingency, for License Termination, Spent Fuel, and Greenfield activities. A detailed cost table is provided in Appendix D, and a table of annual cash flows is provided in Appendix E. Appendix F provides an annual cash flow with the costs broken out by Labor, Equipment & Materials, Waste, Other, and Contingency categories. Proiect Staffing DAEC staffing levels, by organizational department and function, for each period are provided in Table 6-11. The DGC staffing levels, by organizational department and function, for each period are provided in Table 6-12. Waste Disposal Volumes Waste disposal is a significant element of the decommissioning project. The estimated cubic feet of waste are summarized as follows: Class A 379,855 Class B 1,462 Class C 668 Waste disposal volumes and costs, itemized by packaging, transportation, surcharges and disposal costs by waste class and facility, are provided in Table 6-13. The waste disposal cost provided in Table 6-13 does not include contingency. Page 51 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Figure 6-4 DUANE ARNOLD ENERGY CENTER SCENARIO 4

SUMMARY

SCHEDULE 2*I~~~ Ii 100101/1~~~~~ Il 5 940_ -1 2,1ý3

                                                                                                                                               -~'/ooio,'ooo//2i4so,,'oo, 7~000~0~~'

R2'1'7/2. 124Sýi 'eiS i -6 i 0/'ONii 0,4PdI.-o-1 /022 K-o /1-

         -1RP24IdFI ,1-1                    1,/o
                                                                                           '-9

_- 11-o P1I0-8AF8TOR P-- 2 1 1.tIo -. c OýIý Sp 2/11-14!1- w 21 wton '-9 SAFSTOR Pd02 wOiM2/91// N1,; DmfNO st-./j *2/N R"Zimini3 ASAFTOR PdB-DI-ft- .21,11. UIflIo/Iy ,, ,p./o 1/-1007 2- 1/20Q' i//0l'dO s//...o-m ./0 --. -~ý -- WWI

                                                                                                                          ........
                                                                                                                             .....
                                                                                                                                . .......
                                                                                                                                      ....
                                                                                                                                        .. ...

Page 52 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Table 6-11 Scenario 4 DAEC Staff Levels License Termination - 50.75(c) DAEC Staff SAFSTO< ~SAFSTOR SAFSTOR cAFSýTOR SAFSTOR ~SAFSTOR<,,AFS'TO R SAFSTOR2 SAFjSTOR SFTXJ Depaýrtment Pd I ~ Pdc2. ~P3t I' I'l I Pd 5 Pd 6 > Pd -~ Pd 8 Pd 9 I'llP 10 Administration 2.5 29 0.25 1.25 0.25 0.25 2.5 29 21 20 Engineering 7.75 25 0.25 3 0.25 0.25 7.75 25 21 17 Health Physics 3.25 27 0.75 7 0.75 0.75 3.25 27 25 34 Management 2 2 2 2 Plant Maintenance 1.5 27 0.25 7 0.25 0.25 1.5 27 16 5 Plant Operations 3.75 31 4 3.75 31 32 17 Quality Assurance 5 5 3 1 Security Administration 0.5 2 0.5 0.5 0.5 2 2 3 Security Guard Force 3 12 1 5 1 5 3 12 12 12 22.25 160 2.5 27.75 2.5 7 22.25 160 134 111 Page 53 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Table 6-11 Scenario 4 DAEC Staff Levels (Continued) Spent Fuel - 50.54(bb) DAEC Staff DlepartmentK 1)l Ir1d' DPry P'd DIjr 'l DryPd> 1 2 3 Additional Staff for Spent Fuel Shipping 2 Administration 1.2 Engineering 0.75 1 1 Fuel Pool Maintenance and Operation Staff 26 Health Physics 4 1.5 Management 0.25 Plant Maintenance 0.25 2 Security Admin 5 5 0.5 Security Guard Force 50 5 5 1 81 19 9.45 Greenfield - DAEC Staff Administration 9 8 Engineering 7 5 Health Physics 3 1 Management 2 1 Plant Maintenance 3 1 Quality Assurance 2 1 Security Admin 1 1 Security Guard Force 5 5 32 23 Page 54 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Table 6-12 Scenario 4 DGC Staff Levels License Termination - 50.75(c) DGC Staff SAFSOR SAS~d~~ AFSOR S~STR ~SAFTOR *SASTOR> \A1ýTOR VSAFSTOR ~SAFSToR SFSb 7 PI'llitmnt Iy 1 2 Pd' 1P1d'4 l5 IPd 6 I'dl 11,1<Pc8 Pd 9 H 1Pd0~ Administration 8 17 8 8 17 17 11 Engineering 5.5 16 7 5.5 16 16 9 Field Operations 2 11 2 2 11 11 8 Health Physics 5 23 5 5 23 35 19 Management 3 3 3 3 3 3 3 Quality Assurance 3 4 3 3 4 5 3 Waste Operations 2 8 2 16 16 26.5 76 0 36 0 0 26.5 76 103 69 Greenfield - DGC Staff Deprti-ntGrn .P~d ~GrnPdK Administration 10 9 Engineering 11 6 Field Operations 10 5 Health Physics 1 1 Management 3 3 Quality Assurance 2 2 37 26 Page 55 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Table 6-13 Scenario 4 Cost and Schedule Summary (2008 Dollars in Thousands) Period No. , V Period Descriptioii ' Start End ,Years Total Cost, License Termination (50.75(c)) SAFSTOR Pd I SAFSTOR Planning and Design Prior to Shutdown 2/18/2032 2/21/2034 2.00 $18,324 SAFSTOR Pd 2 SAFSTOR Preparations Following Shutdown 2/21/2034 12/3/2034 0.78 $42,894 SAFSTOR Pd 3 SAFSTOR Preparation Delay During Spent Fuel Operations 12/3/2034 2/21/2039 4.21 $7,554 SAFSTOR Pd 4 Completion SAFSTOR Preparations 2/21/2039 12/17/2039 0.81 $20,195 SAFSTOR Pd 5 Dormancy With Dry Storage 12/17/2039 10/23/2067 27.85 $44,354 SAFSTOR Pd 6 Dormancy Only 10/23/2067 6/1/2086 18.60 $42,625 SAFSTOR Pd 7 Decommissioning Planning During Dormancy 6/1/2086 2/19/2088 1.71 $25,075 SAFSTOR Pd 8 Dismantlement Site Modifications and Preparation 2/19/2088 7/15/2089 1.40 $105,235 SAFSTOR Pd 9 Major Component Removal 7/15/2089 7/13/2091 1.99 $191,753 SAFSTOR Pd 10 Site Decontamination 7/13/2091 3/28/2093 1.70 $80,785 Account Total 61.05 $578,794 Spent Fuel (50.54(bb)) Dry Pd 1 Fuel Pool Island Design 6/23/2033 2/21/2034 0.66 $1,256 Dry Pd 2 Spent Fuel Cooling and Transfer to Dry Storage 2/21/2034 2/21/2039 4.99 $114,599 Dry Pd 3 Dry Storage During Dormancy 2/21/2039 7/29/2066 27.43 $108,328 Dry Pd 4 ISFSI Decommissioning 7/29/2066 10/23/2067 1.23 $6,449 Account Total 34.31 $230,632 Greenfield Grn Pd 1 Clean Building Demolition 3/28/2093 5/15/2094 1.13 $37,826 GmrPd 2 Site Restoration 5/15/2094 8/28/2094 0.28 $3,143 Account Total 1.41 $40,969 Scenario Total $850,395 Page 56 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Table 6-14 Scenario 4 Waste Disposal Volumes (Cost Excludes Contingency - 2008 Dollars in Thousands) Waste at Icaing Traispoao urtcarge Iý:11se1 L A3 B uia( ilI Total Facuity an&Wý\astec (1ass ' We igh1t omeCF Vlm(C)Vol ume (CT) Cost> Cost, ,Cost Cost. Disposal Cost Class B and C Facility Class B 130,230 1,462 2,395 $116,115 $863,072 $4,586,706 $1,377,116 $6,943,008 Class C 138,190 668 1,625 $0 $1,419,633 $6,668,137 $934,213 $9,021,982 GTCC 268,420 2,130 4,020 $116,115 $2,282,704 $11,254,843 $2,311,328 $15,964,990 EnergySolutions Class A - Debris 13,304,566 224,594 226,563 $569,725 $2,382,352 $0 $12,370,273 $15,322,349 Class A - Oversized Debris 4,488,865 67,190 67,190 $47,153 $447,470 $0 $7,054,916 $7,549,539 Class A - CWF 2,808,407 38,430 38,489 $496,994 $3,846,607 $0 $8,319,692 $12,663,294 Class A - Large Component 3,746,792 49,642 66,425 $1,172,945 $3,562,890 $0 $18,134,004 $22,869,840 24,348,630 379,855 398,666 $2,286,818 $10,239,319 $0 $45,878,885 $58,405,022 Other Local Construction Debris Landfill 49,809,876 394,249 394,249 $0 $23,001 $0 $1,929,513 $1,952,514 Process for On-Site Fill 228,355,200 3,501,446 3,501,446 $0 $0 $0 $844,914 $844,914 Scrap Metal Recycler 159,729,866 1,092,247 1,092,247 $0 $351,406 $0 $0 $351,406 Grand Total 462,511,992 5,369,927 5,390,629 $2,402,933 $12,896,430 $11,254,843 $50,964,640 $77,518,845 Page 57 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0

7.0 REFERENCES

1. U.S. Nuclear Regulatory Commission, "Domestic Licensing of Production and Utilization Facilities," 10 CFR Part 50, 2008, Available from http://www.nrc.gov/reading-rm/doc-collections/cfr/part050/full-text.html.

2. Atomic Industrial Forum, Inc., "Guidelines for Producing Commercial Nuclear Power Plant Decommissioning Cost Estimates," AIF/NESP-036, May 1986.

3. U.S. Nuclear Regulatory Commission, "Standard Format and Content of Decommissioning Cost Estimates for Nuclear Power Reactors," Regulatory Guide 1.202, February 2005.

4. Federal Register, Vol. 4, "Standard Contract for Disposal of Spent Nuclear Fuel and/or High-Level Radioactive Waste," NRC 10 CFR Part 961 (DOE), January 1, 1999.

5. U.S. Nuclear Regulatory Commission, "Technology, Safety and Costs of Decommissioning a Reference Pressurized Water Reactor Power Station," NUREG/CR-0130, June 1978.

6. U.S. Nuclear Regulatory Commission, "Technology, Safety and Costs of Decommissioning a Reference Boiling Water Reactor Power Station," NUREG/CR-0672, June 1980.

7. ORNL/NTRC-006, Rev. 0, "Transportation Routing Analysis Geographic Information System (TRAGIS) User's Manual," June 2003.

8. Life-of-Plant Disposal Agreement, between EnergySolutions, LLC and FPL Energy Duane Arnold, LLC, dated January 2007.

9. U.S. Nuclear Regulatory Commission, "Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM)," NUREG-1575, Rev. 1, August 2000.

10. U.S. Department of Energy, "Cost Estimating Guide," DOE G 430.1-1, March 1997.

11. U.S. Department of Energy, "Acceptance Priority Ranking & Annual Capacity Report,"

DOE/RW-0567, July 2004.

12. RSMeans, "Labor Rates for the Construction Industry," 2008.

Page 58 of 58

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Appendix A List of Systems and Structures

Duane Arnold Energy Center System and Structure List Unit 1 Type System Name or Description ESS Area Rad Monitoring ESS Breathing Air ESS C02 Fire Protection ESS Control Bldg HVAC ESS Diesel Generator HVAC ESS Diesel Oil System ESS Domestic Water ESS Drywell Sumps ESS Fire Protection ESS Fuel Pool Cooling & Cleanup ESS Instrument Air ESS Liquid Radwaste ESS LLRPSF Area HVAC ESS LLRPSF Area Sumps ESS Offgas Exhaust ESS Primary Containment ESS Primary Containment HVAC ESS Radwaste Bldg HVAC ESS Radwaste Bldg Sumps ESS Reactor Bldg HVAC ESS Reactor Bldg Sumps ESS RW Evaporator & Solid ESS Service Air ESS Solid Radwaste ESS Stack Gas & Bldg Kaman Rad Monitoring ESS Standby Diesel Generator ESS Training Center & Equipment ESS Turbine Bldg HVAC ESS Turbine RB Radwaste Bldg Sampling ESS Well Water NON Admin Bldg Sumps NON Administration Bldg HVAC NON Aux Heating Sys Boiler NON Chlorination & Acid Feed NON Circulating Water NON Condensate & Demin Water NON Condensate Demineralizer NON Condenser Air Removal NON Containment Atm Dilution NON Containment Atmosphere Control NON Cooling Tower NON Data Acquisition Center HVAC NON Drywell Radiation Monitors NON Electrical NON Extract Steam Htr-Vents-Drns NON Feedwater Printed: 10/17/2008 8:21:11 AM Page I of 3

Duane Arnold Energy Center System and Structure List Unit I Type System Name or Description NON General Service Water NON H2 Water Chemistry NON Hydrogen Seal Oil NON Intake Structure HVAC NON Lube Oil Transfer & Storage NON Mach Shop & OG Bldg HVAC NON Makeup Demineralizer NON Misc HVAC NON Nitrogen NON Offgas Bldg Sumps NON Offgas Recombiner NON Post Accident Sampling NON Pumphouse HVAC NON Reactor Bldg Closed Cooling Water NON Reactor Water Cleanup NON Residual Heat Removal NON RHR Service Water NON River Water Supply NON Sanitary Drains NON Standby Gas Treatment NON Stator Cooling NON Technical Suppor Center HVAC NON Torus Vacuum Breakers NON Turbine Bldg Sumps NSSS Condensate NSSS Condenser NSSS CRD Hydraulic NSSS Emergency Service Water NSSS High Pressure Coolant Injection NSSS Low Pressure Core Spray NSSS Main Steam NSSS Nuclear Boiler NSSS Reactor Core Isolation Cooling NSSS Reactor Vessel Recirculation NSSS Standby Liquid Control NSSS Traversing Incore Probe Cal NSSS Turbine NSSS Turbine Steam Seals & Drains STRUC Administration Building STRUC Badging Center STRUC Breathing Air Enclosure STRUC Circulating Water Pipe STRUC Circulating Water Tower No 1 STRUC Circulating Water Tower No 2 STRUC Civil Shop STRUC Compressor Building Page 2 of 3 10/17/2008 8:21:11 Printed: 10/17/2008 AM 8:21:11 AM Page 2 of 3

Duane Arnold Energy Center System and Structure List Unit 1 Type System Name or Description STRUC Condensate Storage Tank Foundation STRUC Construction Support Center STRUC Control Building STRUC Cooling Tower Control & Valve House I STRUC Cooling Tower Control & Valve House 2 STRUC Cooling Tower Training STRUC Data Acquisition Center STRUC Discharge Structure STRUC East Warehouse STRUC Electrical Equipment Building - ISFSI STRUC Electrical Maintenance STRUC Existing Concrete Slabs STRUC Existing Waste Water Treatment Plant STRUC Guard Facility STRUC HPCI and RCIC Building STRUC Intake Structure STRUC ISFSI - Phase 3 STRUC LLRPSF Transformer Foundation STRUC Low Level Radwaste Storage and Processing STRUC Machine Shop STRUC Mechanical Maintenance STRUC New Site Support Building STRUC Off Gas Retention Building STRUC Off Gas Stack STRUC Oil Drum Storage Building STRUC Plant Support Center STRUC Pump House STRUC Radwaste Building STRUC Railroad Air-Lock STRUC Reactor Building STRUC Site Transformer Foundations STRUC Sluice Gate Structure STRUC Sulfuric Acid Tank Foundation STRUC Support Shop STRUC Technical Support Center STRUC Trailer Pad STRUC Training Center STRUC Turbine Building STRUC Turbine Pedestal STRUC Underground Diesel Oil Tank STRUC Underground Fuel Oil Tank STRUC Waste Water Treatment Plant STRUC Well Water Pump House 1,2,3,4 STRUC West Warehouse Page 3 of 3 8:21:11 AM 10/17/2008 8:21:11 Printed: 10/17/2008 AM Page 3 of 3

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Appendix B Spent Fuel Shipping Schedules

Scenarios 1 & 2 - Existing License Termination, Dry Storage, DOE Repository Opens 2025 2009 152 0 1910 610 2520 0 0 0 2010 152 0 2062 610 2672 0 0 2011 0 610 1452 1220 2672 0 0 2012 152 0 1604 1220 2824 0 0 2013 0 0 1604 1220 2824 0 0 2014 368 0 1972 1220 3192 0 0 2015 0 0 1972 1220 3192 0 0 2016 0 0 1972 1220 3192 0 0 2017 0 610 1362 1830 3192 0 0 2018 0 610 752 2440 3192 0 0 2019 0 752 0 3192 3192 0 0 2020 0 0 0 3192 3192 0 0 2021 0 0 0 3192 3192 0 0 2022 0 0 0 3192 3192 0 0 2023 0 0 0 3192 3192 0 0 2024 0 0 0 3192 3192 0 0 2025 0 0 0 3192 3192 0 0 2026 0 0 0 3192 3192 0 0 2027 0 0 0 3131 3131 61 61 2028 0 0 0 2948 2948 183 244 2029 0 0 0 2765 2765 183 427 2030 0 0 0 2643 2643 122 549 2031 0 0 0 2521 2521 122 671 2032 0 0 0 2399 2399 122 793 2033 0 0 0 2277 2277 122 915 2034 0 0 0 2155 2155 122 1037 2035 0 0 0 2094 2094 61 1098 2036 0 0 0 1972 1972 122 1220 2037 0 0 0 1789 1789 183 1403 2038 0 0 0 1667 1667 122 1525 2039 0 0 0 1545 1545 122 1647 2040 0 0 0 1545 1545 0 1647 2041 0 0 0 1423 1423 122 1769 2042 0 0 0 1301 1301 122 1891 2043 0 0 0 1179 1179 122 2013 2044 0 0 0 1057 1057 122 2135 2045 0 0 0 996 996 61 2196 2046 0 0 0 874 874 122 2318 2047 0 0 0 752 752 122 2440 2048 0 0 0 630 630 122 2562 2049 0 0 0 508 508 122 2684 2050 0 0 0 386 386 122 2806 2051 0 0 0 325 325 61 2867 2052 0 0 0 203 203 122 2989 2053 0 0 0 81 81 122 3111 2054 0 0 0 0 0 81 3192 Summary: Total Number Dry Storage Modules in ISFSI 53 Number Dry Storage Modules Purchased Following Shutdown 33 Date Fuel Pool Empty 4/20/20 19 Date ISFSI Empty 2/20/2054

Scenarios 3 & 4 - License Extension, Dry Storage, DOE Repository Opens 2025 2009 152 0 1910 610 2520 0 0 0 2010 152 0 2062 610 2672 0 0 0 2011 0 610 1452 1220 2672 0 0 0 2012 152 0 1604 1220 2824 0 0 0 2013 0 0 1604 1220 2824 0 0 0 2014 152 0 1756 1220 2976 0 0 0 2015 0 0 1756 1220 2976 0 0 0 2016 152 0 1908 1220 3128 0 0 0 2017 0 0 1908 1220 3128 0 0 0 2018 152 0 2060 1220 3280 0 0 0 2019 0 671 1389 1891 3280 0 0 0 2020 152 0 1541 1891 3432 0 0 0 2021 0 0 1541 1891 3432 0 0 0 2022 152 0 1693 1891 3584 0 0 0 2023 0 0 1693 1891 3584 0 0 0 2024 152 0 1845 1891 3736 0 0 0 2025 0 0 1845 1891 3736 0 0 0 2026 152 0. 1997 1891 3888 0 0 2027 0 0 1915 1891 3806 82 0 82 2028 152 0 1873 1891 3764 194 0 276 2029 0 0 1701 1891 3592 172 0 448 2030 152 0 1725 1891 3616 128 0 576 2031 0 0 1605 1891 3496 120 0 696 2032 152 0 1629 1891 3520 128 0 824 2033 0 0 1509 1891 3400 120 0 944 2034 368 0 1773 1891 -3664 104 0 1048 2035 0 0 1669 1891 3560 104 0 1152 2036 0 0 1541 1891 3432 128 0 1280 2037 0 0 1413 1891 3304 128 0 1408 2038 0 915 378 2806 3184 120 0 1528 2039 0 366 0 3111 3111 12 61 1601 2040 0 0 0 3111 3111 0 0 1601 2041 0 0 0 2989 2989 0 122 1723 2042 0 0 0 2806 2806 0 183 1906 2043 0 0 0 2745 2745 0 61 1967 2044 0 0 0 2623 2623 0 122 2089 2045 0 0 0 2501 2501 0 122 2211 2046 0 0 0 2379 2379 0 122 2333 2047 0 0 0 2257 2257 0 122 2455 2048 0 0 0 2135 2135 0 122 2577 2049 0 0 0 2074 2074 0 61 2638 2050 0 0 1952 1952 0 122 2760 0 2051 0 0 1830 1830 0 122 2882 0 2052 0 0 1708 1708 0 122 3004 0 2053 0 0 1586 1586 0 122 3126 0 2054 0 0 1464 1464 0 122 3248 0 2055 0 0 1403 1403 0 61 3309 0 2056 0 0 1281 1281 0 122 3431 0 2057 0 0 1159 1159 0 122 3553 0 2058 0 0 1037 1037 0 122 3675 0 2059 0 0 915 915 0 122 3797 0 2060 0 0 793 793 0 122 3919 0 2061 0 0 732 732 0 61 3980 0 2062 0 0 610 610 0 122 4102 0 2063 0 0 488 488 0 122 4224 0 2064 0 0 366 366 0 122 4346 0 2065 0 0 244 244 0 122 4468 0 2066 0 0 122 122 0 122 4590 0 2067 0 0 0 0 0 122 4712 Summary: Total Number Dry Storage Modules in ISFSI 52 Number Dry Storage Modules Purchased Following Shutdown 21 Date Fuel Pool Empty 4/20/2039 Date ISFSI Empty 2/20/2067

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Appendix C Detailed Project Schedules

DUANE ARNOLD ENERGY CENTER SCENARIO 1 DETAILED SCHEDULE Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Storage Class B and C Waste ID _jTask Name I Duration___tr Emj~......ilrsh]1 ii 23 i[fAA5 tgA6S1[7 31411516117118[1l9 2021 22I231241ýl627I28i29l3Oll2 l3rT2I33134I2Sl281371338I914SI4II42I42I44 I Spent Fuel Management 2157A wk. 812312013 10/2112054 .~m.hI!~mEI I . p~mEhIp -

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Spenit i;* fsi~~i};*i~i* Furel Shipping6 toDE D*E' B~g~n. Begins .......................................... Srb 2/21/2027 2121/2027 2121 3 i Spent Fuet Shipping Complete........... 0wlre 2i22/205.

                                                                                                                                                       ................

62*i o' i 2I~ i*12054 i......... 4 DryPd 1 Fuel Peel island Design 5.............. ndrs ".".......* 6/23/2013, ..... 8/22/2014 12/22

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r Storage o Security ~ di c Modifications

                                                                                  ..... ... . ..............       .. .. . .......                   20wrs 25    wksi........26/2/014 9ff&           ' 221/2014 o144                 /2121 1o S

DryiPd2- SpentFuel Cooling andTransterto Dry Sterage Dry Pd 1BEgd*s 281.2 ~obs.212112814. 0.... 01(5 *2121204i *I2,1/21 2/2112019 II DryP42 Egn 12 T- InstallSpent FuelPoolSystemModlifications. 4 days

                                                                                                                                              ...........   .* 2/21/2014
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• 2/21 48 itr 2/22141 1/26/2*

14 Implem ient .spent Fuetpol PnSecuijty Modification .......... 38 wr k 14 1/26/2015 15*"'"i*

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176ý Spn uel oo Empty 17_ DryPd 2Ends S0ws 2 1/ 2/1*/ 112019 18 DryPit 3-Dry Sorage DurnegDecomnmissioning 249.2wk.s 22/281121 10130/2025

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DUANE ARNOLD ENERGY CENTER SCENARIO 1 DETAILED SCHEDULE Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Storage Class B and C Waste ID I l... -. m. .15uration InP Start I Finish -1 1 J I nW.nJ+/-LIjriU .77+/-&+/-35.I+/-U.iO.1.IY '-~ i~ 52 i Decon Pd 2 - Site Modifications and Preparationsi 93 wks 2/21/2014 i 12/1/2015 5-!3- DeconPd2 Begins. ....... ........

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54 Perform Baselne Radiation Survey...................... 21 , i~2104 2slus 7/1512014 55 performPriarty Smtm tariation ueo and.Place Wastein ntSterimb 2Nwks 4t1302014 t1"" 4tr20i4

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50-7ý . PFinalize Residual Radietion Inventory 7 Aso 12Q24/2014 2/10/2015 56

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DUANE ARNOLD ENERGY CENTER SCENARIO 1 DETAILED SCHEDULE Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Storage Class B and C Waste DuraSqy~J~jtart Pinish ID __,.- 130

          - TaskName________________

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• 61240025" /2512025 136 : CleanDemolition ot InterimWasteStorageFacility 5 9whs 9/282025 10i30/2025 140 Decon Pd 5 Ends Swho 103122lld/u -fyioiYidbS 16/26 141 Grn Pd I - Clean Building Demolition 66 winks 117/2021 2/2412022

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G...................eV s Grading F nish ...................... 164 6 vitr 3/220.22 5/10/202 5118 S .Gm Pd22 Ends...........

DUANE ARNOLD ENERGY CENTER SCENARIO 2 DETAILED SCHEDULE SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Storage Class B and C Waste

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DUANE ARNOLD ENERGY CENTER SCENARIO 2 DETAILED SCHEDULE SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Storage Class B3and C Waste 63 ID Task NI-

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                                   .Decommissioning Pilanning        and Design
                                                                                                                                                       . .....

S ,... 17 .... 2/18/2032 wits .61142032 Plianningand Deign~r Rt site Characterization 16 wits 2/1*/2032 PeareIntegrated Work Settuence and Schedule for Decommissioning 11 1.................

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                                     .e'pare.Detit'ed                                     commissioning .

75 wits &/5/2032 Preapaioraion of Dcommis sioning Liceansea

                                   .lnniirg of Site iepowering.

end.Design Dacumeants 90 wits 4/22/2032 'it

                                   .Admininistrative Actinitieas                                                                                                                                 V8/172032.

42 wits 5/16/2033 Containiment

                                   .Design Access Modifications.

1219162032.

                                   .Pianning and   Design ofPrimary.System.Decontamination 27 wks/              3/17/2033.          6/13/2033 or sAbestos
                                   .Piainningi            Abatement                                                                                                                                       71..2512033 wit 10......

DUANE ARNOLD ENERGY CENTER SCENARIO 3 DETAILED SCHEDULE Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Task Name Select Decommissioning General Contractor

                                                                                                                            . ..

_Duration Start L_.Fjinish.r -.. Lu, 11617l18 11920 211 8=9 I10fl121j 13 114TL5 = I23jj2Ji j Mtj1 1343 4293 131J732134 IiI3j. 49 32 wks 7/1412033 2/21/2034 50 ater than Class A Waste 20 wks 5/19/2033 10/3/2033 D ecen Pd.Deco~dl Eds.. I Ends ........... 0 wks 2/21/2034 2/21/2034

      -     Decon Pd 2-- Site Modifications and Prelparatlons                                                                       93 wks       2/2112034             12/112038 Decon Pd 2begins 0 wks      2/21/2034.           2/21/2034 t          Perform Baseline Radiation Surney 54                                                                                                                                  21 wks       2/21/2034            7/15/2034 55                                   m.Prnry
                                       .Pefo Syste         am DacontIa      mi1na   tion                                            27 wks i.4/3012034                 11/4/2034 56                  Flush and Drain Non-Essential SystemtS                                                                         2.4 wksh     11/5/2034          11/22/2034
                                       .Perfo Hot      Spot Removal and Plac 57                                                                                 Waste                                            4.6 wks     11/23/2034          12/23/2034 58                     inaliz ResipdIual adis                         ventory Oatin                                                             7 wks . 12/24/2034            2/10/2035 59                   Select Shipping Casks and obtain St.h.ir                      ppingPrmits                                        8 who      7/16/2034.             9/9/2034 Design, Specify, and Procure Sp aIai 60                                                                                 Itemsand Materials                               33 who       2/21/2034.10/f7/2034
                                       .Modify Containment           Access C I t.NII                 .. C ...........
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                                                                ...o..m..s....

62 aundry, In-Plant Laydown Areas 18 ws 4/29/2035 9/1/2035 63 .....

             ...............................

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                     ..........          .. ultngand                    ingEqru rad        uipment and Train Operators                        4 wo       11/4/2035.            12/1/2035 Non-Engineered .Procure Standard Eq 65                                                                                 uipment                                            0 wksh     12/1/2035             12/1/2035 66                  1Asbestos
                        ..             Abatement                                                                                    10 wks. 12/24/2034 i            2/3/2035 D o......... P E d2.. ........

0 wksh 12/1/2035 12/1/2035 67 deco n Pd 3 -. Majo r Comnp o ne9nt Rismova 170 wks 12/11/2035. 3/412039 pi

                     . *ne     nPd 3 Begins                                                                                           0 wks      12/1/2035            12/1/2035 Remove, Paciage and Dispose of Norr-Essential Systems                                                          82 wkh       12/2/2035            6/28/2037 71 Segment, Package and Dispose of Nuclear Steam Supply System                                                    43w wh       6/28/2037            4/24 72         .         Dcon Shield Plugs, Pool Plugs andStad Tensioners                                                                 2 wsh      121/22035          12/15/2035 Volume Reduce Control Rod Blades a nd Foet Channels and LPRMS..                     14 vws      12/16/2035            3/23/2036 Segment and Dispose of DrywellHead                                                                             8.2 whos    12/16/2035:           2/10/2036 75                   Purchase Dry Storage Modules for GTCC Waste                                                                      0 who      2/10/2036            2/10/2036 76                   Finalize Internals and Vessel Segmen ting Details                                                                5 wks      2/13/2036            3/17/2036 Segment, Package and Dispose of Re ator 77                                                                                          Intemnals                               35 wks       3/20/2036          11/17/2036 78                   Drain Dryer Separator Pool and Proce ss Liquid Waste                                                             3 wkso    11/20/2036            12/8/2036 79                   Package and Ship Reactor                ;     Pressure Vessel                                                  29 whso      4/25/2038          11/13/2038 80                   Reactor Vessel Insulation Removal and Disposal                                                                   2 wks. 10/31/2038:         11/13/2038 61                   Removal and Disposal of Sacificial ShhieldWell                                                                 16 wks      11/14/20386             3/4/2039 and .Rnmve Dispose of Hazardous W

--- 62- aste 2 wks 2/20/2039 3/4/2039 Pd.Decn 3 Ends 83 0 who 3/4/2039 ............ 3//203"9 Decon Pd 4 - Balance of Plant Decontamnination 96.3 wks 3/42039i 1/7/2041 becon Pd 4 Begins 65 0who 3/4/2039 3/4/2039 Remove ind Dispose of Spent Fuel S§ Racks 4 wo 3orage 3/5/2039 4/1/2039 67 Dri Spent Fuel Pool and Process Li uid Waste 8 wks 4/2/2039 i 5/27/2039

                                       .Segment Package and Dispose of ReI fueling Bridge                                     2 wks      5/28/2039            6/10/2039 6T9                  Segment, Package and Dispose of Spent Fuel Pool Island Equipment                                                   w     i  6/11/2039 1          7/15/2039 90                   Remove, Package and Dispose of Re' maining Active Plant Systems                                                15 wks i     7/16/2039          10/2/2039 Decon Reactor Building 28.5 wka    . 10/29/2039              1172'ii-i n Turbine Building                                                                                21.5 wks         3/5/2039;             813/2039 Decon Radwaste Building                                                                                      11 7 iks I      3/5/2039            5126/2039 Decon HPCi and RCIC Building                                                                                     2 wks      5/19/2039.             6/22039 1i22-                Decon Administration Building                                                                                     1 wk       6/2/2039              6/9/2039 Decon Off-Gas Retention Building 2 whSo      6/9/2039            6/23/2039
                                                                                                                                                                                  =.   .....

DUANE ARNOLD ENERGY CENTER SCENARIO 3 DETAILED SCHEDULE Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Task Name DJ_.urationq Str ...... i t!Lh -11 L2 L.AJ5i.!.jLJ..i9 914 15 18217i1811920211222324252827128291 3233343536J373k 124 Iii Deoon LLRW Storage and Processing Building 4 Wks 6i2312039 712112039 Decon Off-Gas Slack ID 7/23/2039 7/21/2039 4wks De~cn and Remove Yard Structures andTanks. ws .0 127 Segment, Package and Dispose of Contaminated Decon Eqoipment and Tooling

                                                                                                                                                                                                                                                                                                       .01812040 Remove Undergmound Storm Drains and Manholes                                                          .....................

318 days 4i~01/ Fial Status Surveyfor Structures 7/21/2039 : 310 days 7/31/2039 10/8/2040 30

 ---                      Status .Final Surveyfor Land Areas 13 wks
 -iff 131                Preare FinalReport of Dismantling Program becon Pd 4Ends 11/812041          117/2041 59 wks        1/7/20411 133                                                                                                                                                                                                                                  2/2412042
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                                 .Clean Building    Demolition Equipment
                                                                                                                                                                                                                    * ~ , i..
                                                                                                                                                                                                               ...........
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                      ......       urbine Buildintg...................

briiti 14 wks, 4/2912041 1-i38 1/21/2041 Support Building 4/29/2041 5/13/2041 Demolish Data Acquisition and Technical Demolish Control and Administrative 6 .wks* Buildings 611012041

                 ..D emn 11-1 .olis h. G. a rd. F a.c. ity.
                                                   .. ..................................
                                                                                   ......    ...................................................................................................                 4/29/2041
                                 .Demoijs.

HPCI and.RlCIC uilding............... 4/29/2041 _1_42 38wksi 5113/2041 2 wks 143 Demolish Reactor Building 10/281204. Demolish Cooling Towers and Related Structures .0.14/2041. 144ý 145 Demolish Training Center 10/14/2041

                                                                                                                                                                                                                                                                 .4whs 146                Demolish Plant Support Center                                                                                                                                                                                   11111/2041 Remove and Dispose of Underground Storage TTanks                                                                                                                                    3wks     10/14/2041                  I                                                           ..................

11/4/2041 eoish Of-Gaa.Stack 3 w .sk 11.11/2041i

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                                      .Deminous n .gI.W.a..s   te.W.a.te. r T..reIa-a .t,me.  .n.t                                                                                                            1 wk. 11/11/2041         11.18/2241 150                Demolish Remaining Structures                                                                                                                                                     15 wks     11/11/2041           2/24/2042
                                      .GmPd 1.Ends.................

0 wks 2/24/2042 2/24/2042 151 Gm Pd 2 - Site Restoratian inks 2124/2042 5/18/2042 2/24 Gm Pd 2 Begins eins......

                                      .Gmd                              ...............                                                                                                                 0who     2/24/2042 i        2/24/2042 13 Site Restoration Equipment                                                        ................   ....... . ......          ....                                                 2wh . ....
                                                                                                                                                                            . ...... ...................          ,l4/2042 2/2  4 o. 2.        _3_/9/_204_2 Remove Temporary Structures                                                                                                                                                         2 wks        3/9/2042        312312042 Finish Grading and Re-Vegetate Site                                                                                                                                                 8 whs     3/23/2042           5/18/2042 Gm Pd 2 Ends.......................

157 wksh 5/18/2042 5/18/3042 .518

DUANE ARNOLD ENERGY CENTER SCENARIO 4 DETAILED SCHEDULE SAFSTOR, License Extension, Yucca Mountain Opening 2025 3 ,.irraaar / Otafi 3 _11 laName Tea .........................

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DUANE ARNOLD ENERGY CENTER SCENARIO 4 DETAILED SCHEDULE SAFSTOR, License Extension, Yucca Mountain Opening 2025 ID 63 TeckNenre................09 Vourr - ReduceCori Rod. Fue Channe/s & LPRMm 50

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Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Appendix D Detailed Cost Tables

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number I License Status Existing Unit I Shut Down Date 2/2 1/20 14 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total A. License Termination Decon Pd 1 Decommissioning Planning Prior to Shutdown Distributed 1.01 Prepare Written Notification of Cessation of Operations $0 $0 $0 $0 $0 $0 1.02 Prepare Written Notification of Fuel Removal from Vessel $0 $0 $0 $0 $0 $0 1.03 Decommissioning Planning and Design $236 $0 $0 $0 $31 $267 1.04 Planning and Design of Site Characterization $311 $3 $0 $0 $41 $356 1.05 Prepare Integrated Work Sequence and Schedule for Decommissioning $137 $0 $0 $0 $18 $155 1.06 Prepare Decommissioning Activity Specifications $2,486 $20 $0 $0 $326 $2,832 1.07 Prepare License Termination Plan $317 $10 $0 $0 $42 $369 1.08 Prepare Detailed Work Procedures for Decommissioning $2,259 $8 $0 $0 $295 $2,561 1.09 Preparation of Decommissioning License Documents $1,661 $7 $0 $0 $217 $1,885 1.10 Planning and Design of Site Repowering $579 $7 $0 $0 $76 $662 1.11 Administrative Activities $757 $4 $0 $0 $99 $860 1.12 Design Containment Access Modifications $221 $3 $0 $0 $29 $253 1.13 Planning and Design of Primary System Decontamination $202 $2 $0 $0 $26 $230 1.14 Planning for Asbestos Abatement $132 $2 $0 $0 $17 $152 1.15 Select Decommissioning General Contractor $251 $4 $0 $0 $33 . $289 1.16 Design Interim Storage Facility for Greater than Class A Waste $487 $9 $0 $476 $126 $1,099 Distributed Subtotal $10,036 $79 $0 $476 $1,376 $11,970 Undistributed 1.01 Utility Staff $4,631 $0 $0 $0 $602 $5,233 1.03 Security Guard Force $646 $0 $0 $0 $97 $743 1.06 NRC Decommissioning Fees $0 $0 $0 $0 $0 $0 1.09 Energy $0 $0 $0 $0 $0 $0 1.10 Decommissioning General Contractor Staff $4,211 $0 $0 $0 $547 $4,758 Page 1 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 1 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Undistributed Subtotal $9,488 so so $0 $1,246 $10,734 Decon Pd 1 Subtotal $19,524 $79 $0 $476 $2,622 $22,704 Page 2 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 1 License Status Existing Unit 1 Shut Down Date 212112014 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Decon Pd 2 Site Modifications and Preparations Distributed 2.01 Perform Baseline Radiation Survey $233 $88 $0 $0 $42 $363 2.02 Perform Primary System Decontamination and Place Waste in Interim Storage $848 $805 $77 $0 $398 $2,129 2.03 Flush and Drain Non-Essential Systems and Place Waste in Interim Storage $35 $6 $29 $0 $16 $86 2.04 Perform Hot Spot Removal and Place Waste in Interim Storage $545 $176 $43 $0 $176 $941 2.05 Finalize Residual Radiation Inventory $37 $41 $0 $0 $10 $88 2.06 Select Shipping Casks and Obtain Shipping Permits $29 $0 $0 $0 $4 $33 2.07 Design, Specify, and Procure Special Items and Materials $782 $5,300 $0 $0 $791 $6,873 2.08 Modify Containment Access $300 $554 $0 $0 $111 $965 2.09 Construct New Change Rooms, Hot Laundry, In-Plant Laydown Areas $0 $869 $0 $0 $113 $982 2.10 Repower Site $524 $1,578 $0 $0 $273 $2,376 2.11 Test Special Cutting and Handling Equipment and Train Operators $882 $145 $0 $0 $134 $1,161 2.12 Procure Non-Engineered Standard Equipment $0 $4,444 $0 $0 $578 $5,022 2.13 Asbestos Abatement $145 $57 $196 $0 $92 $490 2.14 Construct Interim Storage Facility for Greater than Class A Waste $27 $1,527 $0 $0 $202 $1,756 Distributed Subtotal $4,387 $15,590 $345 $0 $2,940 $23,265 Undistributed 1.01 Utility Staff $29,818 $0 $0 $0 $3,876 $33,695 1.02 Utility Staff HP Supplies $0 $1,028 $0 $0 $154 $1,182 1.03 Security Guard Force $2,281 $0 $0 $0 $342 $2,623 1.04 Insurance $0 $0 $0 $1,093 $164 $1,257 1.05 Property Taxes $0 $o $0 $18 $3 $20 1.06 NRC Decommissioning Fees $0 $0 $0 $679 $102 $780 1.07 Materials and Services $0 $9,205 $0 $0 $1,381 $10,586 1.08 DAW Disposal $0 $0 $45 $0 $7 $52 Page 3 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 1 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment - Disposal Other Contingency Total 1.09 Energy $0 $0 $0 $885 $133 $1,018 1.10 Decommissioning General Contractor Staff $18,644 $0 $0 $0 $2,424 $21,067 1.11 DGC HP Supplies $0 $878 $0 $0 $132 $1,010 Undistributed Subtotal $50,743 $11,111 $45 $2,675 $8,718 $73,290 Decon Pd 2 Subtotal $55,130 $26,701 $390 $2,675 $11,658 $96,555 Page 4 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 1 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Decon Pd 3 Major Component Removal Distributed 3.01 Remove, Package and Dispose of Non-Essential Systems $10,049 $2,322 $7,230 $0 $4,508 $24,109 3.02 Segment, Package and Dispose of Nuclear Steam Supply System $2,343 $923 $29,805 $0 $7,606 $40,677 3.03 Decon Shield Plugs, Pool Plugs and Stud Tensioners $37 $7 $142 $0 $43 $229 3.04 Volume Reduce Control Rods Blades and LPRMS and Place Waste in Interim Storage $533 $330 $903 $0 $406 $2,173 3.05 Purchase Dry Storage Modules for GTCC Waste $0 $1,096 $0 $0 $252 $1,348 3.06 Finalize Internals and Vessel Segmenting Details $18 $0 $0 $0 $4 $22 3.07 Reactor Vessel Insulation Removal and Disposal $104 $15 $214 $0 $109 $441 3.08 Segment, Packageand Place Reactor Internals in Interm Storage $3,080 $1,018 $1,717 $0 $2,203 $8,018 3.09 Package and Dispose of Reactor Pressure Vessel $2,922 $1,073 $6,513 $0 $3,336 $13,843 3.10 Drain Dryer Separator Pool and Process Liquid Waste $0 $0. $0 $0 $0 $0 3.11 Removal and Disposal of Sacrificial Shield Wall and Reactor Pedestal $219 $447 $830 $0 $344 $1,840 3.12 Remove and Dispose of Hazardous Waste $0 $0 $0 $131 $20 $151 Distributed Subtotal $19,305 $7,231 $47,354 $131 $18,831 $92,851 Undistributed 1.01 Utility Staff $47,010 $0 $0 $0 $6,111 $53,121 1.02 Utility Staff HP Supplies $0 $1,784 $0 $0 $268 $2,052 1.03 Security Guard Force $4,186 $0 $0 $0 $628 $4,813 1.04 Insurance $0 $0 $0 $2,006 $301 $2,306 1.05 Property Taxes $0 $0 $0 $33 $5 $37 1.06 NRC Decommissioning Fees $0 $0 $0 $2,051 $308 $2,359 1.07 Materials and Services $0 $14,145 $0 $0 $2,122 $16,267 1.08 DAW Disposal $0 $0 $213 $0 $32 $244 1.09 Energy $0 $0 $0 $1,953 $293 $2,246 1.10 Decommissioning General Contractor Staff $46,118 $0 $0 $0 $5,995 $52,113 Page 5 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 1 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total 1.11 DGC HP Supplies $0 $2,470 $0 $0 $370 $2,840 Undistributed Subtotal $97,314 $18,399 $213 $6,043 $16,433 $138,398 Decon Pd 3 Subtotal $116,619 $25,630 $47,567 $6,174 $35,264 $231,249 Page 6 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 1 License Status Existing Unit I Shut Down Date 2/21/2014 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Decon Pd 4 Balance of Plant Decontamination Distributed 4.01 Remove and Dispose of Spent Fuel Storage Racks $51 $234 $1,451 $0 $399 $2,136 4.02 Drain Spent Fuel Pool and Process Liquid Waste $0 $0 $0 $0 $0 $0 4.03 Flush and Drain Essential Systems Following Fuel Pool Closure and Place Waste in In $24 $10 $29 $0 $15 $78 4.04 Removal and Interim Storage of Spent Resins, Filter Media and Tank Sludge $25 $25 $72 $0 $28 $151 4.05 Removal and Disposal of Off Gas System Adsorber $25 $25 $2,429 $0 $570 $3,049 4.06 Segment, Package and Dispose of Refueling Bridge $50 $9 $262 $0 $74 $395 4.07 Segment, Package and Dispose of Spent Fuel Pool Island Equipment $7 $1 $135 $0 $33 $176 4.08 Remove, Package and Dispose of Remaining Active Plant Systems $3,210 $1,032 $1,407 $0 $1,299 $6,948 4.09 Decon Reactor Building $2,761 $2,213 $4,493 $0 $2,177 $11,644 4.10 Decon Turbine Building $541 $768 $530 $0 $423 $2,262 4.11 Decon Radwaste Building $116 $144 $169 $0 $99 $528 4.12 Decon HPCI and RCIC Building $26 $39 $25 $0 $21 $110 4.13 Decon Administration Building $9 $5 $10 $0 $6 $30 4.14 Decon Off-Gas Retention Building $44 $17 $21 $0 $19 $100 4.15 Decon Low Level Radwaste Storage and Processing $208 $312 $255 $0 $178 $954 4.16 Decon Off-Gas Stack $52 $48 $142 $0 $56 $298 4.17 Segment, Package and Dispose of Contaminated Decon Equipment and Tooling $22 $4 $131 $0 $36 $194 4.18 Remove Underground Storm Drains and Manholes $33 $25 $34 $0 $21 $114 4.19 Final Status Survey for Structures $5,188 $928 $0 $921 $1,545 $8,583 4.20 Final Status Survey for Land Areas $915 $54 $0 $0 $223 $1,191 4.21 Prepare Final Report of Dismantling Program $65 $3 $0 $0 $16 $83 Distributed Subtotal $13,372 $5,896 $11,595 $921 $7,238 $39,024 Undistributed 1.01 Utility Staff $20,601 $0 $0 $0 $2,678 $23,279 Page 7 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 1 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date- 11121325 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total 1.02 Utility Staff HP Supplies $0 $1,363 $0 $0 $204 $1,568 1.03 Security Guard Force $2,376 $0 $0 $0 $356 $2,733 1.04 Insurance $0 $0 $0 $1,139 $171 $1,309 1.05 Property Taxes $0 $0 $0 $18 $3 $21 1.06 NRC Decommissioning Fees $0 $0 $0 $1,164 $175 $1,339 1.07 Materials and Services $0 $6,652 $0 $0 $998 $7,650 1.08 DAW Disposal $0 $0 $160 $0 $24 $184 1.09 Energy $0 $0 $0 $968 $145 $1,113 1.10 Decommissioning General Contractor Staff $18,355 $0 $0 $0 $2,386 $20,742 1.11 DGC HP Supplies $0 $780 $0 $0 $117 $896 Undistributed Subtotal $41,332 $8,795 $160 $3,289 $7,257 $60,834 Decon Pd 4 Subtotal $54,704 $14,691 $11,755 $4,210 $14,495 $99,858 Page 8 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 1 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Decon Pd 5 Interim Waste Storage Facility Operation Distributed 5.01 Transport and Dispose of Greater Than Class A Waste in Interim Storage $153 $664 $30,849 $0 $7,283 $38,948 5.02 License Termination for Interim Waste Storage Facility $141 $18 $0 $250 $53 $462 5.03 Clean Demolition of Interim Waste Storage Facility $79 $41 $171 $0 $42 $333 Distributed Subtotal $373 $723 $31,020 $250 $7,378 $39,743 Undistributed 1.01 Utility Staff $603 $0 $0 $0 $78 $681 1.02 Utility Staff HP Supplies $0 $92 $0 $0 $14 $106 1.03 Security Guard Force $370 $0 $0 $0 $55 $425 1.04 Insurance $0 $0 $0 $2,127 $319 $2,446 1.05 Property Taxes $0 $0 $0 $35 $5 $40 1.06 NRC Decommissioning Fees $0 $0 $0 $1,321 $198 $1,519 1.07 Materials and Services $0 $280 $0 $0 $42 $322 1.08 DAW Disposal $0 $0 $3 $0 $0 $4 1.09 Energy $0 $0W $0 $41 $6 $47 Undistributed Subtotal $973 $372 $3 $3,524 $717 $5,590 Decon Pd 5 Subtotal $1,346 $1,095 $31,023 $3,774 $8,095 $45,333 Page 9 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 1 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total A. License Termination Subtotal $247,323 $68,196 $90,735 $17,309 $72,134 $495,699 B. Spent Fuel Dry P'd 1 Fuel Pool Island Design Distributed 6.01 Design Spent Fuel Support System Modifications $370 $6 $0 $0 $49 $425 6.02 Design Control Room Relocation $358 $5 $0 $0 $47 $411 6.03 Design Spent Fuel Storage Security Modifications $275 $4 $0 $0 $36 $315 Distributed Subtotal $1,003 $15 $0 $0 $132 $1,151 Undistributed 2.01 Utility Spent Fuel Staff $93 $0 $0 $0 $12 $105 2.08 Energy $0 $0 $0 $0 $0 $0 Undistributed Subtotal $93 $0 $0 $0 $12 $105. Dry Pd 1 Subtotal $1,096 $15 $0 $0 $144 $1,256 Page 10 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 1 License Status Existing Unit 1 Shut Down Date 2/2 1/20 14 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Dry Pd 2 Spent Fuel Cooling and Transfer to Dry Storage Distributed 7.01 Install Spent Fuel Pool System Modifications $119 $1,658 $0 $0 $231 $2,008 7.02 Implement Control Room Modifications $956 $1,434 $0 $0 $311 $2,701 7.03 Implement Spent Fuel Pool Security Modifications $500 $750 $0 $0 $163 $1,413 7.04 Purchase of Dry Storage Modules for Fuel Assemblies $0 $36,162 $0 $0 $5,424 $41,586 Distributed Subtotal $1,575 $40,004 $0 $0 $6,129 $47,708 Undistributed 2.01 Utility Spent Fuel Staff $2,050 $0 $0 $0 $267 $2,317 2.02 Utility Staff HP Supplies $0 $791 $0 $0 $119 $910 2.03 Fuel Pool Maintenance and Operation Staff $15,545 $0 $0 $0 $2,332 $17,877 2.05 Security Guard Force $26,784 $0 $0 $0 $4,018 $30,801 2.06 Insurance $0 $0 $0 $4,241 $636 $4,877 2.07 Spent Fuel Fees and Permits $0 $0 $0 $6,376 $956 $7,332 2.08 Energy $0 $0 $0 $1,433 $215 $1,648 2.09 Materials and Services $0 $13,131 $0 $0 $1,970 $15,101 2.10 Spent Fuel Maintenance $0 $0 $0 $1,000 $150 $1,150 Undistributed Subtotal $44,379 $13,922 $0 $13,050 $10,663 $82,013 Dry Pd 2 Subtotal $45,954 $53,926 $0 $13,050 $16,792 $129,721 Page 11I of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number I License Status Existing Unit I Shut Down Date 2/21/2014 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry -Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Dry Pd 3 Dry Storage During Decommissioning Undistributed 2.01 Utility Spent Fuel Staff $8,148 $0 $0 $0 $1,059 $9,208 2.02 Utility Staff HP Supplies $0 $636 $0 $0 $95 $732 2.04 Additional Staff for Spent Fuel Shipping $1,573 $0 $0 $0 $236 $1,809 2.05 Security Guard Force $3,583 $0 $0 $0 $538 $4,121 2.06 Insurance $0 $0 $0 $1,277 $192 $1,469 2.07 Spent Fuel Fees and Permits $0 $0 $0 $3,005 $451 $3,456 2.08 Energy $0 $0 $0 $22 $3 $25 2.09 Materials and Services $0 $4,121 $0 $0 $618 $4,739 2.10 Spent Fuel Maintenance $0 $0 $0 $502 $75 $577 Undistributed Subtotal $13,304 $4,757 $0 $4,806 $3,267 $26,136 Dry Pd 3 Subtotal $13,304 $4,757 $0 $4,806 $3,267 $26,136 Page 12 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca MQuniain Opening 2025, Interim Waste Storage Scenario Number 1 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Dry P'd 4 Dry Storage Only Undistributed 2.01 Utility Spent Fuel Staff $33,794 $0 $0 $0 $4,393 $38,187 2.02 Utility Staff HP Supplies $0 $2,639 $0 $0 $396 $3,035 2.04 Additional Staff for Spent Fuel Shipping $6,525 $0 $0 $0 $979 $7,504 2.05 Security Guard Force $482$0 $0 $0 $2,229 $17,091 2.06 Insurance $0 $0 $0 $8,765 $1,315 $10,080 2.07 Spent Fuel Fees and Permits $0 $0 $0 $12,462 $1,869 $14,331 2.08 Energy $0 $0 $0 $1,088 $163 $1,251 2.09 Materials and Services $0 $17,091 $0 $0 $2,564 $19,655 2.10 Spent Fuel Maintenance $0 $0 $0 $2,081 $312 $2,393 2.11 Property Taxes $0 - $0 $0 $277 $42 $319 Undistributed Subtotal $55,181 $19,730 $0 $24,673 $14,262 $113,846 Dry Pd 4 Subtotal $55,181 $19,730 so $24,673 $14,262 $113,846 Page 13 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number I License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Dry Pd 5 ISFSI Decommissioning Distributed 10.01 Preparation and NRC Review of License Termination Plan $63 $0 $0 $101 $21 $186 10.02 Verification Survey of Horizontal Storage Modules $74 $27 $0 $0 $13 $115 10.03 Preparation of Final Report on Decommissioning and NRC Review $31 $0 $0 $60 $12 $102 10.04 Clean Demolition ofISFSI $1,215 $662 $1,875 $0 $554 $4,305 Distributed Subtotal $1,383 $689 $1,875 $161 $600 $4,708 Undistributed 2.01 Utility Spent Fuel Staff $684 $0 $0 $0 $89 $773 2.05 Security Guard Force $662 $0 $0 $0 $99 $761 2.06 Insurance $0 $0 $0 $154 $23 $178 2.08 Energy $0 $0 $0 $5 $1 $5 2.09 Materials and Services $0 $378 $0 $0 $57 $435 2.11 Property Taxes $0 $0 $0 $12 $2 $14 2.12 Decommissioning General Contractor Staff $348 $0 $0 $0 $52 $400 Undistributed Subtotal $1,694 $378 $0 $171 $323 $2,566 Dry Pd 5 Subtotal $3,077 $1,067 $1,875 $332 $923 $7,274 Page 14 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 1 License Status Existing Unit 1 Shut Down Date 2/2 1/20 14 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total B. Spent Fuel Subtotal $118,612 $79,495 $1,875 $42,861 $35,388 $278,233 C. Greenfield Grn Pd 1 Clean Building Demolition Distributed 11.01 Clean Building Demolition Equipment $0 $738 $0 $0 $170 $907 11.02 Install Temporary Office Buildings $14 $63 $0 $0 $16 $93 11.03 Demolish Low-Level Radwaste Building $2,288 $1,129 $204 $0 $584 $4,204 11.04 Demolish Turbine Building $2,607 $1,258 $151 $0 $648 $4,664 11.05 Demolish Data Acquisition and Technical Support Building $214 $142 $50 $0 $67 $472 11.06 Demolish Control and Administrative Buildings $571 $260 $58 $0 $142 $1,031 11.07 Demolish Guard Facility $91 $42 $8 $0 $22 $163 11.08 Demolish 1-IPCI and RCIC Building $120 $135 $6 $0 $48 $309 11.09 Demolish Reactor Building $3,298 $1,836 $295 $0 $890 $6,319 11.10 Demolish Cooling Towers and Related Structures $533 $696 $185 $0 $253 $1,667 11.11 Demolish Training Center $97 $42 $10 $0 $23 $172 11.12 Demolish Plant Support Center $222 $159 $59 $0 $73 $514 11.13 Remove and Dispose of Underground Storage Tanks $18 $22 $0 $0 $7 $48 11.14 Demolish Off-Gas Stack $85 $45 $18 $0 $24 $172 11.15 Demolish Existing Waste Water Treatment Plant $13 $1 $3 $0 $2 $20 11.16 Demolish Remaining Structures $1,524 $2,042 $496 $0 $732 $4,794 Distributed Subtotal $11,695 $8,610 $1,543 $0 $3,701 $25,549 Undistributed 3.01 Utility Staff $3,765 $0 $0 $0 $489 $4,255 3.02 Security Guard Force $606 $0 $0 $0 $91 $697 3.03 Decommissioning General Contractor Staff $6,313 $0 $0 $0 $821 $7,133 3.04 Energy $0 $0 $0 $244 $37 $281 Page 15 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number I License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total 3.05 Insurance $0 $0 $0 $141 $21 $163 Undistributed Subtotal $10,684 $0 $0 $385 $1,459 $12,529 Grn Pd 1 Subtotal $22,379 $8,610 $1,543 $385 $5,160 $38,078 Page 16 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 1 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Grn Pd 2 Site Restoration Distributed 12.01 Site Restoration Equipment $0 $103 $0 $0 $24 $127 12.02 Remove Temporary Structures $11 $9 $0 $0 $3 $23 12.03 Finish Grading and Re-Vegetate Site $376 $272 $0 $0 $111 $760 Distributed Subtotal $387 $384 $0 $0 $138 $910 Undistributed 3.01 Utility Staff $490 $0 $0 $0 $64 $553 3.02 Security Guard Force $122 $0 $0 $0 $18 $140 3.03 Decommissioning General Contractor Staff $880 $0 $0 $0 $114 $994 3.04 Energy $0 $0 $0 $2 $0 $2 3.05 Insurance $0 $0 $0 $28 $4 $33 Undistributed Subtotal $1.492 o0 $0 5$30 5200 51.722 Grn Pd 2 Subtotal $1,879 $384 $0 $30 $338 $2,632 Page 17 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 1 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total C. Greenfield Subtotal $24,258 $8,994 $1,543 $415 $5,498 $40,710 Scenario No. 1 Total $390,193 $156,685 $94,153 $60,585 $113,020 $814,642 Page 18 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total A. License Termination SAFSTOR Pd 1 SAFSTOR Planning Prior to Shutdown Distributed 1.01 Prepare Written Notification of Cessation of Operations $0 $0 $0 $0 $0 $0 1.02 Prepare Written Notification of Fuel Removal from Vessel $0 $0 $0 $0 $0 $0 1.03 SAFSTOR Planning and Design $236 $0 $0 $0 $31 $267 1.04 Planning for SAFSTOR Baseline Radiation Survey $311 $3 $0 $0 $41 $356 1.05 Prepare SAFSTOR Plan $1,881 $32 $0 $0 $249 $2,162 1.06 Preparation of SAFSTOR License Documents $1,661 $7 $0 $0 $217 $1,885 1.07 Prepare SAFSTOR Integrated Work Schedule $79 $4 $0 $0 $11 $93 1.08 Prepare SAFSTOR Activity Specifications $588 $5 $0 $0 $77 $670 1.09 Adminstrative Activities in Preparation for SAFSTOR $149 $0 $0 $0 $19 $169 1.10 Prepare Detailed SAFSTOR Work Procedures $1,158 $8 $0 $0 $152 $1,317 1.11 Planning for Asbestos Abatement $132 $2 '$0 $0 $17 $152 1.12 Select SAFSTOR General Contractor $251 $4 $0 $0 $33 $289 1.13 Planning and Design of Primary System Decontamination $202 $2 $0 $0 $26 $230 Distributed Subtotal $6,648 $67 $0 $0 $873 $7,590 Undistributed 1.01 Utility Staff $4,631 $0 $0 $0 $602 $5,233 1.03 Security Guard Force $646 $0 $0 $0 $97 $743 1.06 NRC Decbmmissioning Fees $0 $0 $0 $0 $0 $0 1.09 Energy $0 $0 $0 $0 $0 $0 1.10 Decommissioning General Contractor Staff $4,211 $0 $0 $0 $547 $4,758 Undistributed Subtotal $9.488 $0 $0 $O $1246 $10t734 SAFSTOR Pd 1 Subtotal $16,136 $67 $0 $0 $2,119 $18,324 Page 19 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 2 SAFSTOR Preparations Following Shutdown Distributed 2.01 Procure Non-Engineered Standard Equipment For SAFSTOR Preparations $0 $3,417 $0 $0 $444 $3,862 2.02 Perform Primary System Decontamination and Place Waste in Interim Storage $848 $805 $77 $0 $398 $2,129 2.03 Flush, Drain and De-Energize Non-Essential Systems $35 $6 $29 $0 $16 $86 2.04 Drain and Process Suppression Pool Water and Hydrolase Torus Walls $0 $0 $0 $0 $0 $0 2.05 Drain and Process Dryer Storage Pool Water and Hydrolase Dryer Storage Pool $0 $0 $0 $0 $0 $0 2.06 General Area Cleanup $1,146 $478 $165 $0 $411 $2,200 2.07 Asbestos Abatement $145 $57 $196 $0 $92 $490 2.08 Remove and Dispose of Hazardous Waste $0 $0 $0 $131 $20 $151 2.09 Prepare SAFSTOR Report $46 $0 $0 $0 $6 $52 Distributed Subtotal $2,220 $4,763 $467 $131 $1,387 $8,970 Undistributed 1.01 Utility Staff $13,115 $0 $0 $0 $1,705 $14,819 1.02 Utility Staff HP Supplies $0 $452 $0 $0 $68 $520 1.03 Security Guard Force $1,003 $0 $0 $0 $150 $1,154 1.04 Insurance $0 $0 $0 $481 $72 $553 1.05 Property Taxes $0 $0 $0 $8 $1 $9 1.06 NRC Decommissioning Fees $0 $0 $0 $298 $45 $343 1.07 Materials and Services $0 $4,048 $0 $0 $607 $4,656 1.08 DAW Disposal $0 $0 $28 $0 $4 $32 1.09 Energy $0 $0 $0 $389 $58 $448 1.10 Decommissioning General Contractor Staff $8,200 $0 $0 $0 $1,066 $9,266 1.11 DGC HP Supplies $0 $386 $0 $0 $58 $444 Undistributed Subtotal $22,318 $4,886 $28 $1,176 $3,834 $32,244 Page 20 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 2 Subtotal $24,538 $9,649 $495 $1,307 $5,221 $41,214 Page 21 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit I Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 3 SAFSTOR Preparation Delay During Spent Fuel Pool Operations Undistributed 1.01 Utility Staff $737 $0 $0 $0 $96 $832 1.02 Utility Staff HP Supplies $0 $113 $0 $0 $17 $130 1.03 Security Guard Force $452 $0 $0 $0 $68 $520 1.04 Insurance $0 $0 $0 $2,599 $390 $2,989 1.05 Property Taxes $0 $0 $0 $42 $6 $49 1.06 NRC Decommissioning Fees $0 $0 $0 $883 $132 $1,015 1.07 Materials and Services $0 $342 $0 $0 $51 $393 1.09 Energy $0 $0 $0 $939 $141 $1,080 1.1.2 SAFSTOR Surveillence and Maintenance $0. $0 $0 $475 $71 $546 Undistributed Subtotal $1.189 $455 $0 $4.938 $972 $7554 SAFSTOR Pd 3 Subtotal $1,189 $455 $0 $4,938 $972 $7,554 Page 22 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 4 Completion of SAFSTOR Preparations Distributed 4.01 Volume Reduce Control Rods Blades and LPRMS and Place Waste in Interim Storage $533 $330 $903 $0 $406 $2,173 4.02 Drain Spent Fuel Pool and Process Liquid Waste $0 $0 $0 $0 $0 $0 4.03 Flush and Drain Essential Systems Following Fuel Pool Closure $24 $10 $29 $0 $15 $78 4.04 Removal and Interim Storage of Spent Resins, Filter Media and Tank Sludge $25 $25 $72 $0 $28 $151 4.05 Removal and Disposal of Off Gas System Adsorber $25 $25 $2,429 $0 $570 $3,049 4.06 Segment, Package and Dispose of Spent Fuel Pool Island Equipment $7 $1 $135 $0 $33 $176 4.07 Secure Site for Dormancy Period $0 $0 $0 $1,500 $195 $1,695 Distributed Subtotal $614 $391 $3,568 $1,500 $1,247 $7,322 Undistributed 1.01 Utility Staff $2,246 $0 $0 $0 $292 $2,538 1.02 Utility Staff HP Supplies $0 $130 $0 $0 $19 $149 1.03 Security Guard Force $439 $0 $0 $0 $66 $504 1.04 Insurance $0 $0 $0 $504 $76 $580 1.05 Property Taxes $0 $0 $0 $8 $1 $9 1.06 NRC Decommissioning Fees $0 $0 $0 $313 $47 $360 1.07 Materials and Services $0 $737 $0 $0 $110 $847 1.08 DAW Disposal $0 $0 $9 $0 $1 $10 1.09 Energy $0 $0 $0 $315 $47 $362 1.11 DGC HP Supplies $0 $95 $0 $0 $14 $109 1.12 SAFSTOR Surveillence and Maintenance $0 $0 $0 $92 $14 $106 Undistributed Subtotal $2685 $962 $9 $1.232 $687 $5.574 SAFSTOR Pd 4 Subtotal $3,299 $1,353 $3,577 $2,732 $1,934 $12,896 Page 23 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 5 Dormancy With Interim Waste and Dry Spent Fuel Storage Distributed 5.01 Transport and Dispose of Greater Than Class A Waste in Interim Storage $85 $371 $9,019 $0 $2,179 $11,655 Distributed Subtotal $85 $371 $9,019 $0 $2,179 $11,655 Undistributed 1.01 Utility Staff $923 $0 $0 $0 $120 $1,043 1.02 Utility Staff HP Supplies $0 $141 $0. $0 $21 $163 1.03 Security Guard Force $567 $0 $0 $0 $85 $652 1.04 Insurance $0 $0 $0 $3,259 $489 $3,748 1.05 Property Taxes $0 $0 $0 $53 $8 $61 1.06 NRC Decommissioning Fees $0 $0 $0 $1,107 $166 $1,273 1.07 Materials and Services $0 $429 $0 $0 $64 $493 1.08 DAW Disposal $0 $0 $1 $0 $0 $1 1.09 Energy $0 $0 $0 $257 $39 $295 1.12 SAFSTOR Surveillence and Maintenance $0 $0 $0 $595 $89 $684 Undistributed Subtotal $1,490 $570 $1 $5,271 $1,081 $8,413 SAFSTOR Pd 5 Subtotal $1,575 $941 $9,020 $5,271 $3,260 $20,068 Page 24 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 6 Dormancy With Dry Storage Distributed 6.01 Bituminous Roof Replacement $259 $89 $38 $0 $58 $444 Distributed Subtotal $259 $89 $38 $0 $58 $444 Undistributed 1.01 Utility Staff $5,044 $0 $0 $0 $656 $5,700 1.02 Utility Staff HP Supplies $0 $772 $0 $0 $116 $888 1.03 Security Guard Force $3,096 $0 $0 $0 $464 $3,560 1.04 Insurance $0 $0 $0 $14,189 $2,128 $16,317 1.05 Property Taxes $0 $0 $0 $289 $43 $332 1.06 NRC Decommissioning Fees $0 $0 $0 $6,046 $907 $6,953 1.07 Materials and Services $0 $2,342 $0 $0 $351 $2,694 1.09 Energy $0 $0 $0 $1,060 $159 $1,219 1.12 SAFSTOR Surveillence and Maintenance $0 $0 $0 $3,250 $488 $3,738 Undistributed Subtotal $8,140 $3.114 $0 $24.834 $5.312 $41.401 SAFSTOR Pd 6 Subtotal $8,399 $3,203 $38 $24,834 $5,370 $41,845 Page 25 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 7 Dormancy Only Distributed 7.01 Bituminous Roof Replacement $259 $89 $38 $0 $58 $444 Distributed Subtotal $259 $89 $38 $0 $58 $444 Undistributed 1.01 Utility Staff $2,620 $0 $0 $0 $341 $2,961 1.02 Utility Staff HiP Supplies $0 $328 $0 $0 $49 $377 1.03 Security Guard Force $6,576 $0 $0 $0 $986 $7,562 1.04 Insurance $0 $0 $0 $6,028 $904 $6,932 1.05 Property Taxes $0 $0 $0 $123 $18 $141 1.06 NRC Decommissioning Fees $0 $0 $0 $2,568 $385 $2,954 1.07 Materials and Services $0 $2,786 $0 $0 $418 $3,204 1.09 Energy $0 $0 $0 $450 $68 $518 1.12 SAFSTOR Surveillence and Maintenance $0 $0 $0 $2,762 $414 $3,176 Undistributed Subtotal $9,196 $3,114 $0 $11,931 $3,583 $27,825 SAFSTOR Pd 7 Subtotal $9,455 $3,203 $38 $11,931 $3,641 $28,269 Page 26 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 8 Decommissioning Planning During Dormancy Distributed 8.01 Decommissioning Planning and Design $236 $0 $0 $0 $31 $267 8.02 Planning and Design of Site Characterization $311 $3 $0 $0 $41 $356 8.03 Prepare Integrated Work Sequence and Schedule for Decommissioning $137 $0 $0 $0 $18 $155 8.04 Prepare Decommissioning Activity Specifications $2,486 $20 $0 $0 $326 $2,832 8.05 Prepare License Termination Plan $317 $10 $0 $0 $42 $369 8.06 Prepare Detailed Work Procedures for Decommissioning $2,259 $8 $0 $0 $295 $2,561 8.07 Preparation of Decommissioning License Documents $1,661 $7 $0 $0 $217 $1,885 8.08 Planning and Design of Site Revitilization $915 $14 $0 $0 $121 $1,051 8.09 Administrative Activities $757 $4 $0 $0 $99 $860 8.10 Design Containment Access Modifications $221 $3 $0 $0 $29 $253 8.11 Select Decommissioning General Contractor $251 $4 $0 $0 $33 '$289 Distributed Subtotal $9,551 $73 $0 $0 $1,252 $10,878 Undistributed 1.01 Utility Staff $3,962 $0 $0 $0 $515 $4,477 1.02 Utility Staff HP Supplies $0 $136 $0 $0 $20 $157 1.03 Security Guard Force $553 $0 $0 $0 $83 $636 1.04 Insurance $0 $0 $0 $1,059 $159 $1,218 1.05 Property Taxes $0 $0 $0 $17 $3 $20 1.06 NRC Decommissioning F:ees $0 $0 $o $360 $54 $414 1.07 Materials and Services $0 $1,241 $0 $0 $186 $1,427 1.09 Energy $0 $0 $0 $63 $9 $73 1.10 Decommissioning Gener al Contractor Staff $4,211 $0 $0 $0 $547 $4,758 1.11 DGC HP Supplies $0 $200 $0 $0 $30 $230 1.12 SAFSTOR Surveillence aand Maintenance $0 $0 $0 $387 $58 $445 Page 27 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/12025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Undistributed Subtotal $8,726 $1,577 $0 $1,886 $1,664 $13,855 SAFSTOR Pd 8 Subtotal $18,277 $1,650 $0 $1,886 $2,916 $24,733 Page 28 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 9 Dismantlement Site Modifications and Preparations Distributed 9.01 Revitalize Infrastructure and Repower Site $0 $0 $0 $27,957 $3,634 $31,591 9.02 Perform Post-SAFSTOR Baseline Radiation Survey $233 $88 $0 $0 $42 $363 9.03 Finalize Residual Radiation Inventory $37 $41 $0 $0 $10 $88 9.04 Select Shipping Casks and Obtain Shipping Permits $29 $0 $0 $0 $4 $33 9.05 Design, Specify, and Procure Special Items and Materials $782 $5,300 $0 $0 $791 $6,873 9.06 Modify Containment Access $300 $554 $0 $0 $111 $965 9.07 Construct New Change Rooms, Hot Laundry, In-Plant Laydown Areas $0 $869 $0 $0 $113 $982 9.08 Test Special Cutting and Handling Equipment and Train Operators $882 $145 $0 $0 $134 $1,161 9.09 Procure Non-Engineered Standard Equipment $0 $4,444 $0 $0 $578 $5,022 Distributed Subtotal $2,263 $11,441 $0 $27,957 $5,417 $47,078 Undistributed 1.01 Utility Staff $26,137 $0 $0 .$0 $3,398 $29,535 1.02 Utility Staff HP Supplies $0 $901 $0 $0 $135 $1,036 1.03 Security Guard Force $2,000 $0 $0 $0 $300 $2,299 1.04 Insurance $0 $0 $0 $958 $144 $1,102 1.05 Property Taxes $0 $0 $0 $16 $2 $18 1.06 NRC Decommissioning Fees $0 $0 $0 $595 $89 $684 1.07 Materials and Services $0 $8,068 $0 $0 $1,210 $9,279 1.08 DAW Disposal $0 $0 $21 $0 $3 $24 1.09 Energy $0 $0 $0 $646 $97 $743 1.10 Decommissioning General Contractor Staff $16,342 $0 $0 $0 $2,124 $18,466 1.11 DGC HP Supplies $0 $770 $0 $0 $115 $885 Undistributed Subtotal $44,479 $9,739 $21 $2,215 $7,617 $64,071 Page 29 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 9 Subtotal $46,742 $21,180 $21 $30,172 $13,034 $111,149 Page 30 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 10 Major Component Removal Distributed 10.01 Remove, Package and Dispose of Non-Essential Systems $10,049 $2,322 $7,230 $0 $4,508 $24,109 10.02 Segment, Package and Dispose of Nuclear Steam Supply System $2,343 $923 $29,805 $0 $7,606 $40,677 10.03 Decon Shield Plugs, Pool Plugs and Stud Tensioners $37 $7 $142 $0 $43 $229 10.04 Remove and Dispose of Spent Fuel Storage Racks $51 $234 $1,451 $0 $399 $2,136 10.05 Finalize Internals and Vessel Segmenting Details $18 $0 $0 $0 $4 $22 10.06 Reactor Vessel Insulation Removal and Disposal $104 $15 $214 $0 $109 $441 10.07 Segment, Package and Ship Reactor Internals $2,790 $950 $8,641 $0 $3,773 $16,153 10.08 Package and Ship Reactor Pressure Vessel $2,922 $1,073. $6,513 $0 $3,336 $13,843 10.09 Drain Dryer Separator Pool and Process Liquid Waste $0 $0 $0 $0 $0 $0 10.10 Removal and Disposal of Sacrificial Shield Wall and Reactor Pedestal $219 $447 $830 $0 $344 $1,840 10.11 Segment, Package and Dispose of Refueling Bridge $50 $9 $262 $0 $74 $395 10.12 Segment, Package and Dispose of Contaminated Decon Equipment and Tooling $22 $4 $131 $0 $36 $194 10.13 Remove, Package and Dispose of Remaining Active Plant Systems $3,210 $1,032 $1,407 $0 $1,299 $6,948 Distributed Subtotal $21,815 $7,016 $56,626 $0 $21,531 $106,987 Undistributed 1.01 Utility Staff $28,783 $0 $0 $o $3,742 $32,525 1.02 Utility Staff HP Supplies $0 $1,093 $0 $0 $164 $1,256 1.03 Security Guard Force $2,563 $0 $0 $0 $384 $2,947 1.04 Insurance $0 $0 $0 $1,228 $184 $1,412 1.05 Property Taxes $0 $0 $0 $20 $3 $23 1.06 NRC Decommissioning Fees $0 $0 $0 $1,256 $188 $1,444 1.07 Materials and Services $0 $8,661 $0 $0 $1,299 $9,960 1.08 DAW Disposal $0 $0 $246 $0 $37 $282 1.09 Energy $0 $0 $0 $1,248 $187 $1,436 Page 31 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total 1.10 Decommissioning General Contractor Staff $28,237 $0 $0 $0 $3,671 $31,908 1.11 DGC HP Supplies $0 $1,512 $0 $0 $227 $1,739 Undistributed Subtotal $59,583 $11,266 $246 $3,752 $10,086 $84,932 SAFSTOR Pd 1 Subtotal $81,398 $18,282 $56,872 $3,752 $31,617 $191,919 Page 32 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 11 Site Decontamination Distributed 11.01 Decon Reactor Building $2,761 $2,213 $4,493 $0 $2,177 $11,644 11.02 Decon Turbine Building $541 $768 $530 $0 $423 $2,262 11.03 Decon Radwaste Building $116 $144 $169 $0 $99 $528 11.04 Decon HPCI and RCIC Building $26 $39 $25 $0 $21 $110 11.05 Decon Administration Building $9 $5 $10 $0 $6 $30 11.06 Decon Off-Gas Retention Building $44 $17 $21 $0 $19 $100 11.07 Decon Low Level Radwaste Storage and Processing $208 $312 $255 $0 $178 $954 11.08 Decon Off-Gas Stack $52 $48 $142 $0 $56 $298 11.10 Remove Underground Storm Drains and Manholes $33 $25 $34 $0 $21 $114 11.11 Final Status Survey for Structures $5,188 $928 $0 $921 $915 $7,952 11.12 Final Status Survey for Land Areas $915 $54 $0 $0 $126 $1,094 11.13 Prepare Final Report of Dismantling Program $65 $3 $0 $0 $9 $76 Distributed Subtotal $9,958 $4,556 $5,679 $921 $4,050 $25,162 Undistributed 1.01 Utility Staff $19,045 $o $0 $0 $2,476 $21,520 1.02 Utility Staff HP Supplies $0 $1,260 $0 $0 $189 $1,449 1.03 Security Guard Force $2,197 $0 $0 $0 $330 $2,526 1.04 Insurance $0 $0 $0 $1,053 $158 $1,210 1.05 Property Taxes $o $0 $0 $17 $3 $20 1.06 NRC Decommissioning Fees $0 $0 $0 $1,076 $161 $1,238 1.07 Materials and Services $0 $6,149 $0 $0 $922 $7,072 1.08 DAW Disposal $0 $0 $115 $0 $17 $132 1.09 Energy $0 $0 $0 $948 $142 $1,090 1.10 Decommissioning General Contractor Staff $16,969 $0 $0 $0 $2,206 $19,174 Page 33 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total 1.11 DGC HP Supplies $0 $721 $0 $0 $108 $829 Undistributed Subtotal $38,211 $8,130 $115 $3,094 $6,712 $56,260 SAFSTOR Pd 1 Subtotal $48,169 $12,686 $5,794 $4,015 $10,762 $81,422 Page 34 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total A. License Termination Subtotal $259,177 $72,669 $75,855 $90,838 $80,846 $579,393 B. Spent Fuel Dry Pd 1 Fuel Pool Island Design Distributed 12.01 Design Spent Fuel Support System Modifications $370 $6 $0 $0 $49 $425 12.02 Design Control Room Relocation $358 $5 $0 $0 $47 $411 12.03 Design Spent Fuel Storage Security Modifications $275 $4 $0 $0 $36 $315 Distributed Subtotal $1,003 $15 $0 $0 $132 $1,151 Undistributed 2.01 Utility Spent Fuel Staff $93 $0 $0 $0 $12 $105 2.08 Energy $0 $0 $0 $0 $0 $0 Undistributed Subtotal $93 $0 $0 $0 $12 $105 Dry Pd 1 Subtotal $1,096 $15 $0 $0 $144 $1,256 Page 35 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Dry Pd 2 Spent Fuel Cooling and Transfer to Dry Storage Distributed 13.01 Install Spent Fuel Pool System Modifications $119 $1,658 $0$0 $231 $2,008 13.02 Implement Control Room Modifications $956 $1,434 $0 $0 $311 $2,701 13.03 Implement Spent Fuel Pool Security Modifications $500 $750 $0 $0 $163 $1,413 13.04 Purchase of Dry Storage Modules for Fuel Assemblies $0 $36,162 $0 $0 $5,424 $41,586 Distributed Subtotal $1,575 $40,004 $0 $0 $6,129 $47,708 Undistributed 2.01 Utility Spent Fuel Staff $2,050 $0 $0 $0 $267 $2,317 2.02 Utility Staff HP Supplies $0 $791 $0 $0 $119 $910 2.03 Fuel Pool Maintenance and Operation Staff $15,545 $0 $0 $0 $2,332 $17,877 2.05 Security Guard Force $26,784 $0 $0 $0 $4,018 $30,801 2.06 Insurance $0 $0 $0 $4,241 $636 $4,877 2.07 Spent Fuel Fees and Permits $0 $0 $0 $6,376 $956 $7,332 2.08 Energy $0 $0 $0 $1,433 $215 $1,648 2.09 Materials and Services $0 $13,131 $0 $0 $1,970 $15,101 2.10 Spent Fuel Maintenance $0 $0 $0 $1,000 $150 $1,150 Undistributed Subtotal $44,379 $13,922 $0 $13,050 $10,663 $82,013 Dry Pd 2 Subtotal $45,954 $53,926 $0 $13,050 $16,792 $129,721 Page 36 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Dry Pd 3 Dry Storage During Dormancy Undistributed 2.01 Utility Spent Fuel Staff $41,942 $0 $0 $0 $5,452 $47,395 2.02 Utility Staff HP Supplies $0 $3,275 $0 $0 $491 $3,767 2.04 Additional Staff for Spent Fuel Shipping $8,098 $0 $0 $0 $1,215 $9,313 2.05 Security Guard Force $18,445 $0 $0 $0 $2,767 $21,212 2.06 Insurance $0 $0 $0 $6,575 $986 $7,561 2.07 Spent Fuel Fees and Permits $0 $0 $0 $15,467 $2,320 $17,787 2.08 Energy $0 $0 $0 $1,350 $203 $1,553 2.09 Materials and Services $0 $21,212 $0 $0 $3,182 $24,394 2.10 Spent Fuel Maintenance $0 $0 $0 $2,582 $387 $2,970 Undistributed Subtotal $68.485 $24.487 $0 $25.974 $17003 $135952 Dry Pd 3 Subtotal $68,485 $24,487 $0 $25,974 $17,003 $135,952 Page 37 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Dry Pd 4 ISFSI Decommissioning Distributed 15.01 Preparation and NRC Review of License Termination Plan $63 $0 $0 $101 $21 $186 15.02 Verification Survey of Horizontal Storage Modules $74 $27 $0 $0 $13 $115 15.03 Preparation of Final Report on Decommissioning and NRC Review $31 $0 $0 $60 $12 $102 15.04 Clean Demolition ofISFSI $1,215 $662 $1,875 $0 $554 $4,305 Distributed Subtotal $1,383 $689 $1,875 $161 $600 $4,708 Undistributed 2.01 Utility Spent Fuel Staff $684 $0 $0 $0 $89 $773 2.05 Security Guard Force $662 $0 $0 $0 $99 $761 2.08 Energy .$0 $0 $0 $5 $1 $5 2.09 Materials and Services $0 $378 $0 $0 $57 $435 2.12 Decommissioning General Contractor Staff $348 $0 $0 $0 $52 $400 Undistributed Subtotal $1,694 $378 $0 $5 $298 $2,374 Dry Pd 4 Subtotal $3,077 $1,067 $1,875 $166. $898 $7,082 Page 38 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit I Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total B. Spent Fuel Subtotal $118,612 $79,495 $1,875 $39,190 $34,837 $274,011 C. Greenfield Grn Pd 1 Clean Building Demolition Distributed 16.01 Clean Building Demolition Equipment $0 $738 $0 $0 $170 $907 16.02 Demolish Low-Level Radwaste Building $2,288 $1,129 $204 $0 $584 $4,204 16.03 Demolish Turbine Building $2,607 $1,258 $151 $0 $648 $4,664 16.04 Demolish Data Acquisition and Technical Support Building $214 $142 $50 $0 $67 $472 16.05 Demolish Control and Administrative Buildings $571 $260 $58 $0 $142 $1,031 16.06 Demolish Guard Facility $91 $42 $8 $0 $22 $163 16.07 Demolish HPCI and RCIC Building $120 $135 $6 $0 $48 $309 16.08 Demolish Reactor Building $3,298 $1,836 $295 $0 $890 $6,319 16.09 Demolish Cooling Towers and Related Structures $533 $696 $185 $0 $253 $1,667 16.10 Demolish Training Center $97 $42 $10 $0 $23 $172 16.11 Demolish Plant Support Center $222 $159 $59 $0 $73 $514 16.12 Remove and Dispose of Underground Storage Tanks $18 $22 $0 $0 $7 $48 16.13 Demolish Off-Gas Stack $85 $45 $18 $0 $24 $172 16.14 Demolish Existing Waste Water Treatment Plant $13 $1 $3 $0 $2 $20 16.15 Demolish Remaining Structures $1,524 $2,042 $496 $0 $732 $4,794 Distributed Subtotal $11,681 $8,547 $1,543 $0 $3,685 $25,456 Undistributed 3.01 Utility Staff $3,765 $0 $0 $0 $489 $4,255 3.02 Security Guard Force $606 $0 $0 $0 $91 $697 3.03 Decommissioning General Contractor Staff $6,313 $0 $0 $0 $821 $7,133 3.04 Energy $0 $0 $0 $392 $59 $451 3.05 Insurance $0 $0 $0 $141 $21 $163 Page 39 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Undistributed Subtotal $10,684 $0 $0 $533 $1,481 $12,699 Grn Pd 1 Subtotal $22,365 $8,547 $1,543 $533 $5,166 $38,155 Page 40 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Grn Pd 2 Site Restoration Distributed 17.00 Site Restoration 17.01 Site Restoration Equipment $0 $103 $0 $0 $24 $127 17.02 Remove Temporary Structures $37 $30 $0 $0 $12 $78 17.03 Finish Grading and Re-Vegetate Site $376 $272 $0 $0 $111 $760 Distributed Subtotal $413 $405 $0 $0 $147 $965 Undistributed 3.01 Utility Staff $619 $0 $0 $0 $81 $700 3.02 Security Guard Force $154 $0 $0 $0 $23 $177 3.03 Decommissioning General Contractor Staff $1,113 $0 $0 $0 $145 $1,257 3.04 Energy $0 $0 $0 $2 $0 $3 3.05 Insurance $0 $0 $0 $36 $5 $41 Undistributed Subtotal $1,886 $0 $0 $38 $254 $2,178 Grn Pd 2 Subtotal $2,299 $405 $0 $38 $401 $3,143 Page 41 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 License Status Existing Unit 1 Shut Down Date 2/21/2014 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total C. Greenfield Subtotal. $24,664 $8,952 $1,543 $571 $5,567 $41,298 Scenario No. 2 Total $402,453 $161,116 $79,273 $130,599 $121,250 $894,702 Page 42 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment 'Disposal Other Contingency Total A. License Termination Decon Pd 1 Decommissioning Planning Prior to Shutdown Distributed 1.01 Prepare Written Notification of Cessation of Operations $0 $0 $0 $0 $0 $0 1.02 Prepare Written Notification of Fuel Removal from Vessel $0 $0 $0 $0 $0 $0 1.03 Decommissioning Planning and Design $236 $0 $0 $0 $31 $267 1.04 Planning and Design of Site Characterization $311 $3 $0 $0 $41 $356 1.05 Prepare Integrated Work Sequence and Schedule for Decommissioning $137 $0 $0 $0 $18 $155 1.06 Prepare Decommissioning Activity Specifications $2,486 $20 $0 $0 $326 $2,832 1.07 Prepare License Termination Plan $317 $10 $0 $0 $42 $369 1.08 Prepare Detailed Work Procedures for Decommissioning $2,259 $8 $0 $0 $295 $2,561 1.09 Preparation of Decommissioning License Documents $1,661 $7 $0 $0 $217 $1,885 1.10 Planning and Design of Site Repowering $579 $7 $0 $0 $76 $662 1.11 Administrative Activities $757 $4 $0 $0 $99 $860 1.12 Design Containment Access Modifications $221 $3 $0 $0 $29 $253 1.13 Planning and Design of Primary System Decontamination $202 $2 $0 $0 $26 $230 1.14 Planning for Asbestos Abatement $132 $2 $0 $0 $17 $152 1.15 Select Decommissioning General Contractor $251 $4 $0 $0 $33 $289 Distributed Subtotal $9,549 $70 $0 $0 $1,250 $10,871 Undistributed 1.01 Utility Staff $4,631 $0 $0 $0 $602 $5,233 1.03 Security Guard Force $646 $0 $0 $0 $97 $743 1.06 NRC Decommissioning Fees $0 $0 $0 $0 $0 $0 1.09 Energy $0 $0 $0 $0 $0 $0 .1.10 Decommissioning General Contractor Staff $4,211 $0 $0 $0 $547 $4,758 Undistributed Subtotal $9,488 $0 so $0 $1,246 $10,734 Page 43 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Decon Pd I Subtotal $19,037 $70 $0 $0 $2,496 $21,605 Page 44 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Decon Pd 2 Site Modifications and Preparations Distributed 2.01 Perform Baseline Radiation Survey $233 $88 $0 $0 $42 $363 2.02 Primary System Decontamination $848 $805 .$894 $0 $586 $3,134 2.03 Flush and Drain Non-Essential Systems $35 $6 $596 $0 $146 $783 2.04 Hot Spot Removal $545 $176 $894 $0 $372 $1,987 2.05 Finalize Residual Radiation Inventory $37 $41 $0 $0 $10 $88 2.06 Select Shipping Casks and Obtain Shipping Permits $29 $0 $0 $0 $4 $33 2.07 Design, Specify, and Procure Special Items and Materials $782 $5,300 $0 $0 $791 $6,873 2.08 Modify' Containment Access $300 $554 $0 $0 $111 $965 2.09 Construct New Change Rooms, Hot Laundry, In-Plant Laydown Areas $0 $869 $0 $0 $113 $982 2.10 Repower Site $524 $1,578 $0 $0 $273 $2,376 2.11 Test Special Cutting and Handling Equipment and Train Operators $882 $145 $0 $0 $134 $1,161 2.12 Procure Non-Engineered Standard Equipment $0 $4,444 $0 $0 $578 $5,022 2.13 Asbestos Abatement $145 $57 $196 $0 $92 $490 Distributed Subtotal $4,360 $14,063 $2,580 $0 $3,252 $24,257 Undistributed 1.01 Utility Staff $29,818 $0 $0 $0 $3,876 $33,695 1.02 Utility Staff H{P Supplies $0 $1,028 $0 $0 $154 $1,182 1.03 Security Guard Force $2,281 $0 $0 $0 $342 $2,623 1.04 Insurance $0 s0 $0 $1,093 $164 $1,257 1.05 Property Taxes $0 $0 $0 $18 $3 $20 1.06 NRC Decommissioning Fees $0 $0 $0 $679 $102 $780 1.07 Materials and Services $0 $9,205 $0 $0 $1,381 $10,586 1.08 DAW Disposal $0 $0 $45 $0 $7 $52' 1.09 Energy $0 $0 $0 $885 $133 $1,018 Page 45 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total 1.10 Decommissioning General Contractor Staff $18,644 $0 $0 $0 $2,424 $21,067 1.11 DGC HP Supplies , $0 $878 $0 $0 $132 $1,010 Undistributed Subtotal $50,743 $11,111 $45 $2,675 $8,718 $73,290 Decon Pd 2 Subtotal $55,103 $25,174 $2,625 $2,675 $11,970 $97,547 Page 46 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 License Status Extension Unit I Shut Down Date 2/21/2034 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Decon Pd 3 Major Component Removal Distributed 3.01 Remove, Package and Dispose of Non-Essential Systems $10,049 $2,322 $7,230 $0 $4,508 $24,109 3.02 Segment, Package and Dispose of Nuclear Steam Supply System $2,343 $923 $29,805 $0 $7,606 $40,677 3.03 Decon Shield Plugs, Pool Plugs and Stud Tensioners $37 $7 $142 $0 $43 $229 3.04 Volume Reduce Control Rods Blades and LPRMS $323 $201 $5,173 $0 $1,310 $7,006 3.05 Purchase Dry Storage Modules for GTCC Waste $0 $1,096 $0 $0 $252 $1,348 3.06 Finalize Internals and Vessel Segmenting Details $18 $2 $0 $0 $4 $24 3.07 Reactor Vessel Insulation Removal and Disposal $104 $15 $214 $0 $109 $441 3.08 Segment, Package and Ship Reactor Internals $3,080 $1,018 $22,310 $0 $7,352 $33,759 3.09 Package and Ship Reactor Pressure Vessel $2,922 $1,073 $6,513 $0 $3,336 $13,843 3.10 Drain Dryer Separator Pool and Process Liquid Waste $0 $0 $0 $0 $0 $0 3.11 Removal and Disposal of Sacrificial Shield Wall and Reactor Pedestal $219 $447 $830 $0 $344 $1,840 3.12 Remove and Dispose of Hazardous Waste $0 $0 $0 $131 $20 $151 Distributed Subtotal $19,095 $7,104 $72,217 $131 $24,884 $123,427 Undistributed 1.01 Utility Staff $47,010 $0 $0 $0 $6,111 $53,121 1.02 Utility Staff HP Supplies $0 $1,784 $0 $0 $268 $2,052 1.03 Security Guard Force $4,186 $0 $0 $0 $628 $4,813 1.04 Insurance $0 $0 $0 $2,006 $301 $2,306 1.05 Property Taxes $0 $0 $0 $33 $5 $37 1.06 NRC Decommissioning Fees $0 $0 $0 $2,051 $308 $2,359 1.07 Materials and Services $0 $14,145 $0 $0 $2,122 $16,267 1.08 DAW Disposal $0 $0 $209 $0 $31 $240 1.09 Energy $0 $0 $0 $1,953 $293 $2,246 1.10 Decommissioning General Contractor Staff $46,118 $0 $0 $0 $5,995 $52,113 Page 47 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 License Status Extension Unit I Shut Down Date 2/2112034 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total 1.11 DGC HP Supplies $0 $2,470 $0 $0 $370 $2,840 Undistributed Subtotal $97,314 $18,399 $209 $6,043 $16,432 $138,394 Decon Pd 3 Subtotal $116,409 $25,503 $72,426 $6,174 $41,316 $261,821 Page 48 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Decon Pd 4 Balance of Plant Decontamination Distributed 4.01 Remove and Dispose of Spent Fuel Storage Racks $51 $234 $1,451 $0 $399 $2,136 4.02 Drain Spent Fuel Pool and Process Liquid Waste $0 $0 $0 $0 $0 $0 4.03 Flush and Drain Essential Systems Following Fuel Pool Closure $24 $10 $596 $0 $145 $775 4.04 Removal and Disposal of Spent Resins, Filter Media and Tank Sludge $25 $25 $1,490 $0 $354 $1,895 4.05 Removal and Disposal of Off Gas System Adsorber $25 $25 $2,429 $0 $570 $3,049 4.06 Segment, Package and Dispose of Refueling Bridge $50 $9 $262 $0 $74 $395 4.07 Segment, Package and Dispose of Spent Fuel Pool Island Equipment $7 $1 $135 $0 $33 $176 4.08 Remove, Package and Dispose of Remaining Active Plant Systems $3,210 $1,032 $1,407 $0 $1,299 $6,948 4.09 Decon Reactor Building $2,761 $2,213 $4,493 $0 $2,177 $11,644 4.10 Decon Turbine Building $541 $768 $530 $0 $423 $2,262 4.11 Decon Radwaste Building $116 $144 $169 $0 $99 $528 4.12 Decon HPCI and RCIC Building $26 $39 $25 $0 $21 $110 4.13 Decon Administration Building $9 $5 $10 $0 $6 $30 4.14 Decon Off-Gas Retention Building $44 $17 $21 $0 $19 $100 4.15 Decon Low Level Radwaste Storage and Processing $208 $312 $255 $0 $178 $954 4.16 Decon Off-Gas Stack $52 $48 $142 $0 $56 $298 4.17 Segment, Package and Dispose of Contaminated Decon Equipment and Tooling $22 $4 $131 $0 $36 $194 4.18 Remove Underground Storm Drains and Manholes $33 $25 $34 $0 $21 $114 4.19 Final Status Survey for Structures $5,188 $928 $0 $921 $1,545 $8,583 4.20 Final Status Survey for Land Areas $915 $54 $0 $0 $223 $1,191 4.21 Prepare Final Report of Dismantling Program $65 $3 $0 $0 $16 $83 Distributed Subtotal $13,372 $5,896 $13,580 $921 $7,694 $41,465 Undistributed 1.01 Utility Staff $20,601 $0 $0 $0 $2,678 $23,279 Page 49 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total 1.02 Utility Staff HP Supplies $0 $1,363 $0 $0 $204 $1,568 1.03 Security Guard Force $2,376 $0 $0 $0 $356 $2,733 1.04 Insurance $0 $0 $0 $1,139 $171 $1,309 1.05 Property Taxes $0 $0 $0 $18 $3 $21 1.06 NRC Decommissioning Fees $0 $0 $0 $707 $106 $813 1.07 Materials and Services $0 $6,652 $0 $0 $998 $7,650 1.08 DAW Disposal $0 $0 $160 $0 $24 $184 1.09 Energy $0 $0 $0 $968 $145 $1,113 1.10 Decommissioning General Contractor Staff $18,355 $0 $0 $0 $2,386 $20,742 1.11 DGC HP Supplies $0 $780 $0 $0 $117 $896 Undistributed Subtotal $41,332 $8,795 $160 $2,832 $7,188 $60,308 Decon Pd 4 Subtotal $54,704 $14,691 $13,740 $3,753 $14,882 $101,773 Page 50 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total A. License Termination Subtotal $245,253 $65,438 $88,791 $12,602 $70,664 $482,746 B. Spent Fuel Dry Pd 1 Fuel Pool Island Design Distributed 5.01 Design Spent Fuel Support System Modifications $370 $6 $0 $0 $49 $425 5.02 Design Control Room Relocation $358 $5 $0 $0 $47 $411 5.03 Design Spent Fuel Storage Security Modifications $275 $4 $0 $0 $36 $315 Distributed Subtotal $1,003 $15 $0 $0 $132 $1,151 Undistributed 2.01 Utility Spent Fuel Staff $93 $0 $0 $0 $12 $105 2.08 Energy $0 $0 $0 $0 $0 $0 Undistributed Subtotal $93 $0 $0 $0 $12 $105 Dry Pd 1 Subtotal $1,096 $15 $0 $0 $144 $1,256 Page 51 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Dry Pd 2 Spent Fuel Cooling and Transfer to Dry Storage Distributed 6.01 Install Spent Fuel Pool System Modifications $119 $1,658 $0 $0 $231 $2,008 6.02 Implement Control Room Modifications $956 $1,434 $0 $0 $311 $2,701 6.03 Implement Spent Fuel Pool Security Modifications $500 $750 $0 $0 $163 $1,413 6.04 Purchase of Dry Storage Modules for Fuel Assemblies $0 $23,012 $0 $0 $3,452 $26,464 Distributed Subtotal $1,575 $26,854 $0 $0 $4,157 $32,586 Undistributed 2.01 Utility Spent Fuel Staff $2,050 $0 $0 $0 $267 $2,317 2.02 Utility Staff H1P Supplies $0 $791 $0 $0 $119 $910 2.03 Fuel Pool Maintenance and Operation Staff $15,545 $0 $0 $0 $2,332 $17,877 2.05 Securi-ty Guard Force $26,784 $0 $0 $0 $4,018 $30,801 2.06 Insurance $0 $0 $0 $4,241 $636 $4,877 2.07 Spent Fuel Fees and Permits $0 $0 $0 $6,376 $956 $7,332 2.08 Energy $0, $0 $0 $1,433 $215 $1,648 2.09 Materials and Services $0 $13,131 $0 $0 $1,970 $15,101 2.10 Spent Fuel Maintenance $0 $0 $0 $1,000 $150 $1,150 Undistributed Subtotal $44,379 $13,922 $0 $13,050 $10,663 $82,013 Dry Pd 2 Subtotal $45,954 $40,776 $0 $13,050 $14,820 $114,599 Page 52 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Dry Pd 3 Dry Storage During Decommissioning Undistributed 2.01 Utility Spent Fuel Staff $3,942 $0 $0 $0 $513 $4,455 2.02 Utility Staff HP Supplies $0 $308 $0 $0 $46 $354 2.04 Additional Staff for Spent Fuel Shipping $761 $0 $0 $0 $114 $875 2.05 Security Guard Force $1,734 $0 $0 $0 $260 $1,994 2.06 Insurance $0 $0 $0 $618 $93 $711 2.07 Spent Fuel Fees and Permits $0 $0 $0 $1,454 $218 $1,672 2.08 Energy $0 $0 $0 $11 $2 $12 2.09 Materials and Services $0 $1,994 $0 $0 $299 $2,293 2.10 Spent Fuel Maintenance $0 $0 $0 $243 $36 $279 Undistributed Subtotal $6,437 $2,302 $0 $2,326 $1,581 $12,645 Dry Pd 3 Subtotal $6,437 $2,302 $0 $2,326 $1,581 $12,645 Page 53 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Dry Pd 4 Dry Storage Only Undistributed 2.01 Utility Spent Fuel Staff $29,475 $0 $0 $0 $3,832 $33,306 2.02 Utility Staff 1HP Supplies $0 $2,302 $0 $0 $345 $2,647 2.04 Additional Staff for Spent Fuel Shipping $5,691 $0 $0 $0 $854 $6,545 2.05 Security Guard Force $12,962 $0 $0 $0 $1,944 $14,906 2.06 Insurance $0 $0 $0 $7,645 $1,147 $8,792 2.07 Spent Fuel Fees and Permits $0 $0 $0 $10,869 $1,630 $12,500 2.08 Energy $0 $0 $0 $949 $142 $1,091 2.09 Materials and Services $0 $14,907 $0 $0 $2,236 $17,143 2.10 Spent Fuel Maintenance $0 $0 $0 $1,815 $272 $2,087 2.11 Property Taxes $0 $0 $0 $242 $36 $278 Undistributed Subtotal $48.128 $17.209 $0 $21.520 $12.438 $99.295 Dry Pd 4 Subtotal $48,128 $17,209 $0 $21,520 $12,438 $99,295 Page 54 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 License Status Extension Unit I Shut Down Date 2/21/2034 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Dry Pd 5 ISFSI Decommissioning Distributed 9.01 Preparation and NRC Review of License Termination Plan $63 $0 $0 $101 $21 $186 9.02 Verification Survey of Horizontal Storage Modules $46 $22 $0 $0 $9 $77 9.03 Preparation of Final Report on Decommissioning and NRC Review $31 $0 $0 $60 $12 $102 9.04 Clean Demolition of ISFSI $1,103 $612 $1,514 $0 $481 $3,710 Distributed Subtotal $1,243 $634 $1,514 $161 $523 $4,075 Undistributed 2.01 Utility Spent Fuel Staff $686 $0 $0 $0 $89 $775 2.05 Security Guard Force $663 $0 $0 $0 $99 $762 2.06 Insurance $0 $0 $0 $155 $23 $178 2.08 Energy $0 $0 $0 $5 $1 $5 2.09 Materials and Services $0 $379 $0 $0 $57 $436 2.11 Property Taxes $0 $0 $0 $12 $2 $14 2.12 Decommissioning General Contractor Staff $349 $0 $0 $0 $52 $401 Undistributed Subtotal $1,698 $379 $0 $172 $323 $2,571 Dry Pd 5 Subtotal $2,941 $1,013 $1,514 $333 $846 $6,646 Page 55 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 License Status Extension Unit I Shut Down Date 2/21/2034 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total B. Spent Fuel Subtotal $104,556 $61,315 $1,514 $37,229 $29,829 $234,441 C. Greenfield Grn Pd 1 Clean Building Demolition Distributed 10.01 Clean Building Demolition Equipment $0 $738 $0 $0 $170 $907 10.02 Install Temporary Office Buildings $14 $63 $0 $0 $16 $93 10.03 Demolish Low-Level Radwaste Building $2,288 $1,129 $204 $0 $584 $4,204 10.04 Demolish Turbine Building $2,607 $1,258 $151 $0 $648 $4,664 10.05 Demolish Data Acquisition and Technical Support Building $214 $142 $50 $0 $67 $472 10.06 Demolish Control and Administrative Buildings $571 $260 $58 $0 $142 $1,031 10.07 Demolish Guard Facility $91 $42 $8 $0 $22 $163 10.08 Demolish HPCI and RCIC Building $120 $135 $6 $0 $48 $309 10.09 Demolish Reactor Building $3,298 $1,836 $295 $0 $890 $6,319 10.10 Demolish Cooling Towers and Related Structures $533 $696 $185 $0 $253 $1,667 10.11 Demolish Training Center $97 $42 $10 $0 $23 $172 10.12 Demolish Plant Support Center $222 $159 $59 $0 $73 $514 10.13 Remove and Dispose of Underground Storage Tanks $18 $22 $0 $0 $7 $48 10.14 Demolish Off-Gas Stack $85 $45 $18 $0 $24 $172 10.15 Demolish Existing Waste Water Treatment Plant $13 $1 $3 $0 $2 $20 10.16 Demolish Remaining Structures $1,524 $2,042 $496 $0 $732 $4,794 Distributed Subtotal $11,695 $8,610 $1,543 $0 $3,701 $25,549 Undistributed 3.01 Utility Staff $3,765 $0 $0 $0 $489 $4,255 3.02 Security Guard Force $606 $0 $0 $0 $91 $697 3.03 Decommissioning General Contractor Staff $6,313 $0 $0 $0 $821 $7,133 3.04 Energy $0 $0 $0 $244 $37 $281 Page 56 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total 3.05 Insurance $0 $0 $0 $141 $21 $163 Undistributed Subtotal $10,684 $0 $0 $385 $1,459 $12,529 Grn Pd I Subtotal $22,379 $8,610 $1,543 $385 $5,160 $38,078 Page 57 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Grn Pd 2 Site Restoration Distributed 11.01 Site Restoration Equipment $0 $103 $0 $0 $24 $127 11.02 Remove Temporary Structures $11 $9 $0 $0 $3 $23 11.03 Finish Grading and Re-Vegetate Site $376 $272 $0 $0 $111 $760 Distributed Subtotal $387 $384 $0 $0 $138 $910 Undistributed 3.01 Utility Staff $490 $0 $0 $0 $64 $553 3.02 Security Guard Force $122 $0 $0 $0 $18 $140 3.03 Decommissioning General Contractor Staff $880 $0 $0 $0 $114 $994 3.04 Energy $0 $0 $0 $2 $0 $2 3.05 Insurance $0 $0 $0 $28 $4 $33 Undistributed Subtotal $1,492 $0 $0 $30 $200 $1,722 Grn Pd 2 Subtotal $1,879 $384 $0 $30 $338 $2,632 Page 58 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 License Status Extension Unit I Shut Down Date 2/21/2034 Decommissioning Alternative Decon Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total C. Greenfield Subtotal $24,258 $8,994 $1,543 $415 $5,498 $40,710 Scenario No. 3 Total $374,067 $135,747 $91,848 $50,246 $105,991 $757,897 Page 59 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total A. License Termination SAFSTOR Pd 1 SAFSTOR Planning Prior to Shutdown Distributed 1.01 Prepare Written Notification of Cessation of Operations $0 $0 $0 $0 $0 $0 1.02 Prepare Written Notification of Fuel Removal from Vessel $0 $0 $0 $0 $0 $0 1.03 SAFSTOR Planning and Design $236 $0 $0 $0 $31 $267 1.04 Planning for SAFSTOR Baseline Radiation Survey $311 $3 $0 $0 $41 $356 1.05 Prepare SAFSTOR Plan $1,881 $32 $0 $0 $249 $2,162 1.06 Preparation of SAFSTOR License Documents $1,661 $7 $0 $0 $217 $1,885 1.07 Prepare SAFSTOR Integrated Work Schedule $79 $4 $0 $0 $11 $93 1.08 Prepare SAFSTOR Activity Specifications $588 $5 $0 $0 $77 $670 1.09 Adminstrative Activities in Preparation for SAFSTOR $149 $0 $0 $0 $19 $169 1.10 Prepare Detailed SAFSTOR Work Procedures $1,158 $8 $0 $0 $152 $1,317 1.11 Planning for Asbestos Abatement $132 $2 $0 $0 $17 $152 1.12 Select SAFSTOR General Contractor $251 $4 $0 $0 $33 $289 1.13 Planning and Design of Primary System Decontamination $202 $2 $0 $0 $26 $230 Distributed Subtotal $6,648 $67 $0 $0 $873 $7,590 Undistributed 1.01 Utility Staff $4,631 $0 $0 $0 $602 $5,233 1.03 Security Guard Force $646 $0 $0 $0 $97 $743 1.06 NRC Decommissioning Fees $0 $0 $0 $0 $0 $0 1.09 Energy $0 $0 $0 $0 $0 $0 1.10 Decommissioning General Contractor Staff $4,211 $0 $0 $0 $547 $4,758 Undistributed Subtotal $9,488 $0 $0 $0 $1,246 $10,734 SAFSTOR Pd 1 Subtotal $16,136 $67 $0 $0 $2,119 $18,324 Page 60 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 2 SAFSTOR Preparations Following Shutdown Distributed 2.01 Procure Non-Engineered Standard Equipment For SAFSTOR Preparations $0 $3,417 $0 $0 $444 $3,862 2.02 Primary System Decontamination $848 $805 $894 $0 $586 $3,134 2.03 Flush, Drain and De-Energize Non-Essential Systems $16 $6 $596 $0 $142 $761 2.04 Drain and Process Suppression Pool Water and Hydrolase Torus Walls $0 $0 $0 $0 $0 $0 2.05 Drain and Process Dryer Storage Pool Water and Hydrolase Dryer Storage Pool $0 $0 $0 $0 $0 $0 2.06 General Area Cleanup $1,146 $478 $165 $0 $411 $2,200 2.07 Asbestos Abatement $145 $57 $196 $0 $92 $490 2.08 Remove and Dispose of Hazardous Waste $0 $0 $0 $131 $20 $151 2.09 Prepare SAFSTOR Report $46 $0 $0 $0 $6 $52 Distributed Subtotal $2,201 $4,763 $1,851 $131 $1,701 $10,650 Undistributed 1.01 Utility Staff $13,115 $0 $0 $0 $1,705 $14,819 1.02 Utility Staff HP Supplies $0 $452 $0 $0 $68 $520 1.03 Security Guard Force $1,003 $0 $0 $0 $150 $1,154 1.04 Insurance $0 $0 $0 $481 $72 $553 1.05 Property Taxes $0 $0 $0 $8 $1 $9 1.06 NRC Decommissioning Fees $0 $0 $0 $298 $45 $343 1.07 Materials and Services $0 $4,048 $0 $0 $607 $4,656 1.08 DAW Disposal $0 $0 $28 $0 $4 $32 1.09 Energy $0 $0 $0 $389 $58 $448 1.10 Decommissioning General Contractor Staff $8,200 $0 $0 $0 $1,066 $9,266 1.11 DGCIIP Supplies $0 $386 $0 $0 $58 $444 Undistributed Subtotal $22,318 $4,886 $28 $1,176 $3,834 $32,244 Page 61 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 2 Subtotal $24,519 $9,649 $1,879 $1,307 $5,535 $42,894 Page 62 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit I Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 3 SAFSTOR Preparation Delay During Spent Fuel Pool Operations Undistributed 1.01 Utility Staff $737 $0 $0 $0 $96 $832 1.02 Utility Staff HP Supplies $0 $113 $0 $0 $17 $130 1.03 Security Guard Force $452 $0 $0 $0 $68 $520 1.04 Insurance $0 $0 $0 $2,599 $390 $2,989 1.05 Property Taxes $0 $0 $0 $42 $6 $49 1.06 NRC Decommissioning Fees $0 $0 $0 $883 $132 $1,015 1.07 Materials and Services $0 $342 $0 $0 $51 $393 1.09 Energy $0 $0 $0 $939 $141 $1,080 1.12 SAFSTOR Surveillence and Maintenance $0 $0 $0 $475 $71 $546 Undistributed Subtotal $1,189 $455 $0 $4,938 $972 $7,554 SAFSTOR Pd 3 Subtotal $1,189 $455 $0 $4,938 $972 $7,554 Page 63 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 4 Completion of SAFSTOR Preparations Distributed 4.01 Volume Reduce Control Rods Blades and LPRMS $323 $201 $5,173 $0 $1,310 $7,006 4.02 Drain Spent Fuel Pool and Process Liquid Waste $0 $0 $0 $0 $0 $0 4.03 Flush and Drain Essential Systems Following Fuel Pool Closure $24 $10 $596 $0 $145 $775 4.04 Removal and Disposal of Spent Resins, Filter Media and Tank Sludge $25 $25 $1,490 $0 $354 $1,895 4.05 Removal and Disposal of Off Gas System Adsorber $25 $25 $2,429 $0 $570 $3,049 4.06 Segment, Package and Dispose of Spent Fuel Pool Island Equipment $7 $1 $135 $0 $33 $176 4.07 Secure Site for Dormancy Period $0 $0 $0 $1,500 $225 $1,725 Distributed Subtotal $404 $262 $9,823 $1,500 $2,637 $14,626 Undistributed 1.01 Utility Staff $2,246 $0 $0 $0 $292 $2,538 1.02 Utility Staff HP Supplies $0 $130 $0 $0 $19 $149 1.03 Security Guard Force $439 $0 $0 $0 $66 $504 1.04 Insurance $0 $0 $0 $504 $76 . $580 1.05 Property Taxes $0 $0 $0 $8 $1 $9 1.06 NRC Decommissioning Fees $0 $0 $0 $313 $47 $360 1.07 Materials and Services $0 $737 $0 $0 $110 $847 1.08 DAW Disposal $0 $0 $5 $0 $1 $5 1.09 Energy $0 $0 $0 $315 $47 $362 1.11 DGC HP Supplies $0 $95 $0 $0 $14 $109 1.12 SAFSTOR Surveillence and Maintenance $0 $0 $0 $92 $14 $106 Undistributed Subtotal $2.685 $962 $5 $1.232 $687 $5.569 SAFSTOR Pd 4 Subtotal $3,089 $1,224 $9,828 $2,732 $3,324 $20,195 Page 64 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 5 Dormancy With Dry Storage Distributed 5.01 Bituminous Roof Replacement- 20 year $259 $89 $38 $0 $58 $444 Distributed Subtotal $259 $89 $38 $0 $58 $444 Undistributed 1.01 Utility Staff $4,862 $0 $0 $0 $632 $5,494 1.02 Utility Staff HP Supplies $0 $744 $0 $0 $112 $856 1.03 Security Guard Force $2,984 $0 $0 $0 $448 $3,432 1.04 Insurance $0 $0 $0 $17,158 $2,574 $19,732 1.05 Property Taxes $0 $0 $0 $279 $42 $320 1.06 NRC Decommissioning Fees $0 $0 $0 $5,828 $874 $6,702 1.07 Materials and Services $0 $2,258 $0 $0 $339 $2,596 1.09 Energy $0 $0 $0 $1,021 $153 $1,175 1.12 SAFSTOR Surveillence and Maintenance $0 $0 $0 $3,133 $470 $3,603 Undistributed Subtotal $7,846 $3,002 $0 $27,419 $5,644 $43,910 SAFSTOR Pd 5 Subtotal $8,105 $3,091 $38 $27,419 $5,702 $44,354 Page 65 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool .Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 6 Dormancy Only Distributed 6.01 Bituminous Roof Replacement - 40 year $259 $89 $38 $0 $58 $444 Distributed Subtotal $259 $89 $38 $0 $58 $444 Undistributed 1.01 Utility Staff $3,972 $0 $0 $0 $516 $4,488 1.02 Utility Staff HP Supplies $0 $497 $0 $0 $75 $572 1.03 Security Guard Force $9,968 $0 $0 $0 $1,495 $11,464 1.04 Insurance $0 $0 $0 $9,137 $1,371 $10,508 1.05 Property Taxes $0 $0 $0 $186 $28 $214 1.06 NRC Decommissioning Fees $0 $0 $0 $3,894 $584 $4,478 1.07 Materials and Services $0 $4,224 $0 $0 $634 $4,857 1.09 Energy $0 $0 $0 $682 $102 $785 1.12 SAFSTOR Surveillence and Maintenance $0 $0 $0 $4,187 $628 $4,815 Undistributed Subtotal $13,940 $4,721 $0 $18,086 $5,433 $42,181 SAFSTOR Pd 6 Subtotal $14,199 $4,810 $38 $18,086 $5,491 $42,625 Page 66 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 7 Decommissioning Planning During Dormancy Distributed 7.01 Decommissioning Planning and Design $236 $0 $0 $0 $31 $267 7.02 Planning and Design of Site Characterization $311 $3 $0 $0 $41 $356 7.03 Prepare Integrated Work Sequence and Schedule for Decommissioning $137 $0 $0 $0 $18 $155 7.04 Prepare Decommissioning Activity Specifications $2,486 $20 $0 $0 $326 $2,832 7.05 Prepare License Termination Plan $317 $10 $0 $0 $42 $369 7.06 Prepare Detailed Work Procedures for Decommissioning $2,259 $8 $0 $0 $295 $2,561 7.07 Preparation of Decommissioning License Documents $1,661 $7 $0 $0 $217 $1,885 7.08 Planning and Design of Site Revitilization $915 $14 $0 $0 $121 $1,051 7.09 Administrative Activities $757 $4 $0 $0 $99 $860 7.10 Design Containment Access Modifications $221 $3 $0 $0 $29 $253 7.11 Select Decommissioning General Contractor $251 $4 $0 $0 $33 $289 Distributed Subtotal $9,551 $73 $0 $0 $1,252 $10,878 Undistributed 1.01 Utility Staff $3,962 $0 $0 $0 $515 $4,477 1.02 Utility Staff HP Supplies $0 $136 $0 $0 $20 $157 1.03 Security Guard Force $553 $0 $0 $o $83 $636 1.04 Insurance $0 $0 $0 $1,059 $159 $1,218 1.05 Property Taxes $0 $0 $0 $17 $3 $20 1.06 NRC Decommissioning Fees $0 $0 $0 $658 $99 $756 1.07 Materials and Services $0 $1,241 $0 $0 $186 $1,427 1.09 Energy $0 $0 $0 $63 $9 $73 1.10 Decommissioning General Contractor Staff $4,211 $0 $0 $0 $547 $4,758 1.11 DGC 1HP Supplies $0 $200 $0 $0 $30 $230 1.12 SAFSTOR Surveillence and Maintenance $0 $0 $0 $387 $58 $445 Page 67 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Undistributed Subtotal $8,726 $1,577 $0 $2,184 $1,709 $14,197 SAFSTOR Pd 7 Subtotal $18,277 $1,650 $0 $2,184 $2,961 $25,075 Page 68 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor

• Equipment Disposal Other Contingency Total SAFSTOR Pd 8 Dismantlement Site Modifications and Preparations Distributed 8.01 Revitalize Infrastructure and Repower Site $0 $0 $0 $27,957 $3,634 $31,591 8.02 Perform Post-SAFSTOR Baseline Radiation Survey $233 $88 $0 $0 $42 $363 8.03 Finalize Residual Radiation Inventory $37 $41 $0 $0 $10 $88 8.04 Select Shipping Casks and Obtain Shipping Permits $29 $0 $0 $0 $4 $33 8.05 Design, Specify, and Procure Special Items and Materials $782 $5,300 $0 $0 $791 $6,873 8.06 Modify Containment Access $300 $554 $0 $0 $111 $965 8.07 Construct New Change Rooms, Hot Laundry, In-Plant Laydown Areas $0 $869 $0 $0 $113 $982 8.08 Test Special Cutting and Handling Equipment and Train Operators $882 $145 $0 $0 $134 $1,161 8.09 Procure Non-Engineered Standard Equipment $0 $4,444 $0 $0 $578 $5,022 Distributed Subtotal $2,263 $11,441 $0 $27,957 $5,417 $47,078 Undistributed 1.01 Utility Staff $23,560 $0 $0 $0 $3,063 $26,623 1.02 Utility Staff HP Supplies $0 $812 $0 $0 $122 $934 1.03 Security Guard Force $1,802 $0 $0 $0 $270 $2,073 1.04 Insurance $0 $0 $0 $864 $130 $993 1.05 Property Taxes $0 $0 $0 $14 $2 $16 1.06 NRC Decommissioning Fees $0 $0 $0 $883 $132 $1,016 1.07 Materials and Services $0 $7,273 $0 $0 $1,091 $8,364 1.08 DAW Disposal $0 $0 $21 $0 $3 $24 1.09 Energy $0 $0 $0 $583 $87 $670 1.10 Decommissioning General Contractor Staff $14,731 $0 $0 $0 $1,915 $16,646 1.11 DGC HP Supplies $0 $694 $0 $0 $104 $798 Undistributed Subtotal $40,093 $8,779 $21 $2,344 $6,919 $58,157 Page 69 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 8 Subtotal $42,356 $20,220 $21 $30,301 $12,336 $105,235 Page 70 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 9 Major Component Removal Distributed 9.01 Remove, Package and Dispose of Non-Essential Systems $10,049 $2,322 $7,230 $0 $4,508 $24,109 9.02 Segment, Package and Dispose of Nuclear Steam Supply System $2,343 $923 $29,805 $0 $7,606 $40,677 9.03 Decon Shield Plugs, Pool Plugs and Stud Tensioners $37 $7 $142 $0 $43 $229 9.04 Remove and Dispose of Spent Fuel Storage Racks $51 $234 $1,451 $0 $399 $2,136 9.05 Finalize Internals and Vessel Segmenting Details $18 $0 $0 $0 $4 $22 9.06 Reactor Vessel Insulation Removal and Disposal $104 $15 $214 $0 $109 $441 9.07 Segment, Package and Ship Reactor Internals $2,790 $950 $8,641 $0 $3,773 $16,153 9.08 Package and Ship Reactor Pressure Vessel $2,922 $1,073 $6,513 $0 $3,336 $13,843 9.09 Drain Dryer Separator Pool and Process Liquid Waste $0 $0 $0 $0 $0 $0 9.10 Removal and Disposal of Sacrificial Shield Wall $219 $447 $830 $0 $344 $1,840 9.11 Segment, Package and Dispose of Refueling Bridge $50 $9 $262 $0 $74 $395 9.12 Segment, Package and Dispose of Contaminated Decon Equipment and Tooling $22 $4 $131 $0 $36 $194 9.13 Remove, Package and Dispose of Remaining Active Plant Systems $3,210 $1,032 $1,407 $0 $1,299 $6,948 Distributed Subtotal $21,815 $7,016 $56,626 $0 $21,531 $106,987 Undistributed 1.01 Utility Staff $28,783 $0 $0 $0 $3,742 $32,525 1.02 Utility Staff HP Supplies $0 $1,093 $0 $0 $164 $1,256 1.03 Security Guard Force $2,563 $0 $0 $0 $384 $2,947 1.04 Insurance $0 $0 $0 $1,228 $184 $1,412 1.05 Property Taxes $0 $0 $0 $20 $3 $23 1.06 NRC Decommissioning Fees $0 $0 $0 $1,256 $188 $1,444 1.07 Materials and Services $0 $8,661 $0 $0 $1,299 $9,960 1.08 DAW Disposal $0 $0 $246 $0 $37 $282 1.09 Energy $0 $0 $0 $1,104 $166 $1,270 Page 71 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total 1.10 Decommissioning General Contractor Staff $28,237 $0 $0 $0 $3,671 $31,908 1.11 DGC HP Supplies $0 $1,512 $0 $0 $227 $1,739 Undistributed Subtotal $59,583 $11,266 $246 $3,608 $10,065 $84,766 SAFSTOR Pd 9 Subtotal $81,398 $18,282 $56,872 $3,608 $31,596 $191,753 Page 72 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total SAFSTOR Pd 10 Site Decontamination Distributed 10.01 Decon Reactor Building $2,761 $2,213 $4,493 $0 $2,177 $11,644 10.02 Decon Turbine Building $541 $768 $530 $0 $423 $2,262 10.03 Decon Radwaste Building $116 $144 $169 $0 $99 $528 10.04 Decon HPCI and RCIC Building $26 $39 $25 $0 $21 $110 10.05 Decon Administration Building $9 $5 $10 $0 $6 $30 10.06 Decon Off-Gas Retention Building $44 $17 $21 $0 $19 $100 10.07 Decon Low Level Radwaste Storage and Processing $208 $312 $255 $0 $178 $954 10.08 Decon Off-Gas Stack $52 $48 $142 $0 $56 $298 10.10 Remove Underground Storm Drains and Manholes $33 $25 $34 $0 $21 $114 10.11 Final Status Survey for Structures $5,188 $928 $0 .$921 $915 $7,952 10.12 Final Status Survey for Land Areas $915 $54 $0 $0 $126 $1,094 10.13 Prepare Final Report of Dismantling Program $65 $3 $0 $0 $9 $76 Distributed Subtotal $9,958 $4,556 $5,679 $921 $4,050 $25,162 Undistributed 1.01 Utility Staff $19,045 $0 $0 $0 $2,476 $21,520 1.02 Utility Staff HP Supplies $0 $1,260 $0 $0 $189 $1,449 1.03 Security Guard Force $2,197 $0 $0 $0 $330 $2,526 1.04 Insurance $0 $0 $0 $1,053 $158 $1,210 1.05 Property Taxes $0 $0 $0 $17 $3 $20 1.06 NRC Decommissioning Fees $0 $0 $0 $654 $98 $752 1.07 Materials and Services $0 $6,149 $0 $0 $922 $7,072 1.08 DAW Disposal $0 $0 $115 $0 $17 $132 1.09 Energy $0 $0 $o $816 $122 $939 1.10 Decommissioning General Contractor Staff $16,969 $0 $0 $0 $2,206 $19,174 Page 73 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total 1.11 DGC HP Supplies $0 $721 $0 $0 $108 $829 Undistributed Subtotal $38,211 $8,130 $115 $2,540 $6,629 $55,623 SAFSTOR Pd 1 Subtotal $48,169 $12,686 $5,794 $3,461 $10,679 $80,785. Page 74 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total A. License Termination Subtotal $257,437 .$72,134 $74,470 $94,036 $80,715 $578,794 B. Spent Fuel Dry Pd 1 Fuel Pool Island Design Distributed 11.01 Design Spent Fuel Support System Modifications $370 $6 $0 $0 $49 $425 11.02 Design Control Room Relocation $358 $5 $0 $0 $47 $411 11.03 Design Spent Fuel Storage Security Modifications $275 $4 $0 $0 $36 $315 Distributed Subtotal $1,003 $15 $0 $0 $132 $1,151 Undistributed 2.01 Utility Spent Fuel Staff $93 $0 $0 $0 $12 $105 2.08 Energy $0 $0 $0 $0 $0 $0 Undistributed Subtotal $93 $0 $0 $0 $12 $105 Dry Pd 1 Subtotal $1,096 $15 $0 $0 $144 $1,256 Page 75 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit I Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Dry Pd 2 Spent Fuel Cooling and Transfer to Dry Storage Distributed 12.01 Install Spent Fuel Pool System Modifications $119 $1,658 $0 $0 $231 $2,008 12.02 Implement Control Room Modifications $956 $1,434 $0 $0 $311 $2,701 12.03 Implement Spent Fuel Pool Security Modifications $500 $750 $0 $0 $163 $1,413 12.04 Purchase of Dry Storage Modules for Fuel Assemblies $0 $23,012 $0 $0 $3,452 $26,464 Distributed Subtotal $1,575 $26,854 $0 $0 $4,157 $32,586 Undistributed 2.01 Utility Spent Fuel Staff $2,050 $0 $0 $0 $267 $2,317 2.02 Utility Staff HP Supplies $0 $791 $0 $0 $119 $910 2.03 Fuel Pool Maintenance and Operation Staff $15,545 $0 $0 $0 $2,332 $17,877 2.05 Security Guard Force $26,784 $0 $0 $0 $4,018 $30,801 2.06 Insurance $0 $0 $0 $4,241 $636 $4,877 2.07 Spent Fuel Fees and Permits $0 $0 $0 $6,376 $956 $7,332 2.08 Energy $0 $0 $0 $1,433 $215 $1,648 2.09 Materials and Services $0 $13,131 $0 $0 $1,970 $15,101 2.10 Spent Fuel Maintenance $0 $0 $0 $1,000 $150 $1,150 Undistributed Subtotal $44,379 $13,922 $0 $13,050 $10,663 $82,013 Dry Pd 2 Subtotal $45,954 $40,776 $0 $13,050 $14,820 $114,599 Page 76 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit I Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Dry Pd 3 Dry Storage During Dormancy Undistributed 2.01 Utility Spent Fuel Staff $33,420 $0 $0 $0 $4,345 $37,765 2.02 Utility Staff HP Supplies $0 $2,610 $0 $0 $391 $3,001 2.04 Additional Staff for Spent Fuel Shipping $6,453 $0 $0 $0 $968 $7,421 2.05 Security Guard Force $14,697 $0 $0 $0 $2,205 $16,902 2.06 Insurance $0 $0 $0 $5,239 $786 $6,025 2.07 Spent Fuel Fees and Permits $0 $0 $0 $12,324 $1,849 $14,173 2.08 Energy $0 $0 $0 $1,076 $161 $1,237 2.09 Materials and Services $0 $16,902 $0 $0 $2,535 $19,438 2.10 Spent Fuel Maintenance $0 $0 $0 $2,058 $309 $2,366 Undistributed Subtotal $54,570 $19,512 $0 $20,697 $13,549 $108,328 Dry Pd 3 Subtotal $54,570 $19,512 $0 $20,697 $13,549 $108,328 Page 77 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Dry Pd 4 ISFSI Decommissioning Distributed 14.01 Preparation and NRC Review of License Termination Plan $63 $0 $0 $101 $21 $186 14.02 Verification Survey of Horizontal Storage Modules $46 $22 $0 $0 $9 $77 14.03 Preparation of Final Report on Decommissioning and NRC Review $31 $0 $0 $60 $12 . $102 14.04 Clean Demolition ofISFSI $1,103 $612 $1,514 $0 $481 $3,710 Distributed Subtotal $1,243 $634 $1,514 $161 $523 $4,075 Undistributed 2.01 Utility Spent Fuel Staff $684 $0 $0 $0 $89 $773 2.05 Security Guard Force $662 $0 $0 $0 $99 $761 2.08 Energy $0 $0 $0 $5 $1 $5 2.09 Materials and Services $0 $378 $0 $0 $57 $435 2.12 Decommissioning General Contractor Staff $348 $0 $0 $0 $52 $400 Undistributed Subtotal $1,694 $378 $0 $5 $298 $2,374 Dry Pd 4 Subtotal $2,937 $1,012 $1,514 $166 $821 $6,449 Page 78 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total B. Spent Fuel Subtotal $104,557 $61,315 $1,514 $33,913 $29,334 $230,632 C. Greenfield Grn Pd 1 Clean Building Demolition Distributed 15.01 Clean Building Demolition Equipment $0 $738 $0 $0 $170 $907 15.02 Demolish Low-Level Radwaste Building $2,288 $1,129 $204 $0 $584 $4,204 15.03 Demolish Turbine Building $2,607 $1,258 $151 $0 $648 $4,664 15.04 Demolish Data Acquisition and Technical Support Building $214 $142 $50 $0 $67 $472 15.05 Demolish Control and Administrative Buildings $571 $260 $58 $0 $142 $1,031 15.06 Demolish Guard Facility $91 $42 $8 $0 $22 $163 15.08 Demolish Reactor Building $3,298 $1,836 $295 $0 $890 $6,319 15.09 Demolish Cooling Towers and Related Structures $533 $696 $185 $0 $253 $1,667 15.10 Demolish Training Center $97 $42 $10 $0 $23 $172 15.11 Demolish Plant Support Center $222 $159 $59 $0 $73 $514 15.12 Remove and Dispose of Underground Storage Tanks $18 $22 $0 $0 $7 $48 15.14 Demolish Off-Gas Stack $85 $45 $18 $0 $24 $172 15.16 Demolish Remaining Structures $1,524 $2,042 $496 $0 $732 $4,794 Distributed Subtotal $11,548 $8,411 $1,534 $0 $3,635 $25,127 Undistributed 3.01 Utility Staff $3,765 $0 $0 $0 $489 $4,255 3.02 Security Guard Force $606 $0 $0 $0 $91 $697 3.03 Decommissioning General Contractor Staff $6,313 $0 $0 $0 $821 $7,133 3.04 Energy $0 $0 $0 $392 $59 $451 3.05 Insurance $0 $0 $0 $141 $21 $163 Undistributed Subtotal $10,684 $0 $0 $533 $1,481 $12,699 Page 79 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool .Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Grn Pd 1 Subtotal $22,232 $8,411 $1,534 $533 $5,116 $37,826 Page 80 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Grn Pd 2 Site Restoration Distributed 16.01 Site Restoration Equipment $0 $103 $0 $0 $24 $127 16.02 Remove Temporary Structures $37 $30 $0 $0 $12 $78 16.03 Finish Grading and Re-Vegetate Site $376 $272 $0 $0 $111 $760 Distributed Subtotal $413 $405 $0 $0 $147 $965 Undistributed 3.01 Utility Staff $619 $0 $0 $0 $81 $700 3.02 Security Guard Force $154 $0 $0 $0 $23 $177 3.03 Decommissioning General Contractor Staff $1,113 $0 $0 $0 $145 $1,257 3.04 Energy $0 $0 $0 $2 $0 $3 3.05 Insurance $0 $0 $0 $36 $5 $41 Undistributed Subtotal $1.886 $0 $0 $38 $254 $2,178 Grn Pd 2 Subtotal $2,299 $405 $0 $38 $401 $3,143 Page 81 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 License Status Extension Unit 1 Shut Down Date 2/21/2034 Decommissioning Alternative Safestor Fuel Pool Systems Modified Spent Fuel Alternative Dry Repository Opening Date: 1/1/2025 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total C. Greenfield Subtotal $24,531 $8,816 $1,534 $571 $5,517 $40,969 Scenario No. 4 Total $386,525 $142,265 $77,518 $128,520 $115,566 $850,395 Page 82 of 82

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Appendix E Annual Cash Flow Tables

Duane Arnold Annual Cost By Account 2008 Dollars in Thousands Scenario No 1 Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Year License Termination Spent Fuel Greenfield Total 2012 $9,800 $0 $0 $9,800 2013 $11,275 $1,256 $0 $12,531 2014 $48,280 $22,266 $0 $70,546 2015 $55,907 $25,928 $0 $81,835 2016 $70,994 $25,928 $0 $96,922 2017 $70,994 $25,928 $0 $96,922 2018 $70,994 $25,928 $0 $96,922 2019 $56,954 $7,094 $0 $64,048 2020 $54,002 $3,909 $0 $57,910 2021 $1,166 $3,909 $32,937 $38,011 2022 $8,163 $3,909 $7,773 $19,845 2023 $13,138 $3,909 $0 $17,046 2024 $13,138 $3,909 $0 $17,046 2025 $10,895 $3,949 $0 $14,844 2026 $0 $4,103 $0 $4,103 2027 $0 $4,103 $0 $4,103 2028 $0 $4,103 $0 $4,103 2029 $0 $4,103 $0 $4,103 2030 $0 $4,103 $0 $4,103 2031 $0 $4,103 $0 $4,103 2032 $0 $4,103 $0 $4,103 2033 $0 $4,103 $0 $4,103 2034 $0 $4,103 $0 $4,103 2035 $0 $4,103 $0 $4,103 2036 $0 $4,103 $0 $4,103 2037 $0 $4,103 $0 $4,103 2038 $0 $4,103 $0 $4,103 2039 $0 $4,103 $0 $4,103 2040 $0 $4,103 $0 $4,103 2041 $0 $4,103 $0 $4,103 2042 $0 $4,103 $0 $4,103 2043 $0 $4,103 $0 $4,103 2044 $0 $4,103 $0 $4,103 2045 $0 $4,103 $0 $4,103 2046 $0 $4,103 $0 $4,103 2047 $0 $4,103 $0 $4,103 2048 $0 $4,103 $0 $4,103 2049 $0 $4,103 $0 $4,103 2050 $0 $4,103 $0 $4,103 2051 $0 $4,103 $0 $4,103 2052 $0 $4,103 $0 $4,103 2053 $0 $4,880 $0 $4,880 2054 $0 $4.739 $0 $4.739 Total $495,699 $278,233 $40,710 $814,642 Page 1 of 6

Duane Arnold Annual Cost By Account 2008 Dollars in Thousands Scenario No 2 SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Year License Termination Spent Fuel Greenfield Total 2012 $7,908 $0 $0 $7,908 2013 $9,100 $1,256 $0 $10,356 2014 $42,672 $22,237 $0 $64,909 2015 $1,789 $25,934 $0 $27,722 2016 $1,789 $25,934 $0 $27,722 2017 $1,789 $25,934 $0 $27,722 2018 $1,789 $25,934 $0 $27,722 2019 $13,308 $7,136 $0 $20,444 2020 $3,794 $3,949 $0 $7,742 2021 $3,794 $3,949 $0 $7,742 2022 $3,794 $3,949 $0 $7,742 2023 $3,794 $3,949 $0 $7,742 2024 $3,794 $3,949 $0 $7,742 2025 $2,036 $3,949 $0 $5,985 2026 $1,448 $3,949 $0 $5,397 2027 $1,448 $3,949 $0 $5,397 2028 $1,448 $3,949 $0 $5,397 2029 $1,448 $3,949 $0 $5,397 2030 $1,448 $3,949 $0 $5,397 2031 $1,448 $3,949 $0 $5,397 2032 $1,448 $3,949 $0 $5,397 2033 $1,448 $3,949 $0 $5,397 2034 $1,448 $3,949 $0 $5,397 2035 $1,448 $3,949 $0 $5,397 2036 $1,448 $3,949 $0 $5,397 2037 $1,448 $3,949 $0 $5,397 2038 $1,448 $3,949 $0 $5,397 2039 $1,448 $3,949 $0 $5,397 2040 $1,448 $3,949 $0 $5,397 2041 $1,448 $3,949 $0 $5,397 2042 $1,448 $3,949 $0 $5,397 2043 $1,448 $3,949 $0 $5,397 2044 $1,448 $3,949 $0 $5,397 2045 $1,448 $3,949 $0 $5,397 2046 $1,448 $3,949 $0 $5,397 2047 $1,448 $3,949 $0 $5,397 2048 $1,448 $3,949 $0 $5,397 2049 $1,448 $3,949 $0 $5,397 2050 $1,448 $3,949 $0 $5,397 2051 $1,448 $3,949 $0 $5,397 2052 $1,448 $3,949 $0 $5,397 2053 $1,448 $4,724 $0 $6,172 2054 $2,184 $4,616 $0 $6,800 2055 $2,303 $0 $0 $2,303 2056 $2,303 $0 $0 $2,303 2057 $2,303 $0 $0 $2,303 2058 $2,303 $0 $0 $2,303 2059 $2,303 $0 $0 $2,303 2060 $2,303 $0 $0 $2,303 2061 $2,303 $0 $0 $2,303 2062 $2,303 $0 $0 $2,303 Page 2 of 6

Duane Arnold Annual Cost By Account 2008 Dollars in Thousands Scenario No 2 SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Year License Termination Spent Fuel Greenfield Total 2063 $2,303 $0 $0 $2,303 2064 $2,303 $0 $0 $2,303 2065 $2,303 $0 $0 $2,303 2066 $9,354 $0 $0 $9,354 2067 $14,366 $0 $0 $14,366 2068 $63,862 $0 $0 $63,862 2069 $79,225 $0 $0 $79,225 2070 $96,091 $0 $0 $96,091 2071 $80,953 $0 $0 $80,953 2072 $47,681 $0 $0 $47,681 2073 $18,654 $0 $20,535 $39,189 2074 $0 $0 $20.763 $20.763 Total $579,393 $274,011 $41,298 $894,702 Page 3 of 6

Duane Arnold Annual Cost By Account 2008 Dollars in Thousands Scenario No 3 Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Year License Termination Spent Fuel Greenfield Total 2032 $9,332 $0 $0 $9,332 2033 $10,729 $1,256 $0 $11,985 2034 $48,632 $19,662 $0 $68,294 2035 $57,080 $22,910 $0 $79,990 2036 $80,380 $22,910 $0 $103,290 2037 $80,380 $22,910 $0 $103,290 2038 $80,380 $22,910 $0 $103,290 2039 $59,555 $6,645 $0 $66,201 2040 $55,119 $3,906 $0 $59,025 2041 $1,160 $3,906 $32,955 $38,021 2042 $0 $4,036 $7,755 $11,791 2043 $0 $4,104 $0 $4,104 2044 $0 $4,104 $0 $4,104 2045 $0 $4,104 $0 $4,104 2046 $0 $4,104 $0 $4,104 2047 $0 $4,104 $0 $4,104 2048 $0 $4,104 $0 $4,104 2049 $0 $4,104 $0 $4,104 2050 $0 $4,104 $0 $4,104 2051 $0 $4,104 $0 $4,104 2052 $0 $4,104 $0 $4,104 2053 $0 $4,104 $0 $4,104 2054 $0 $4,104 $0 $4,104 2055 $0 $4,104 $0 $4,104 2056 $0 $4,104 $0 $4,104 2057 $0 $4,104 $0 $4,104 2058 $0 $4,104 $0 $4,104 2059 $0 $4,104 $0 $4,104 2060 $0 $4,104 $0 $4,104 2061 $0 $4,104 $0 $4,104 2062 $0 $4,104 $0 $4,104 2063 $0 $4,104 $0 $4,104 2064 $0 $4,104 $0 $4,104 2065 $0 $4,104 $0 $4,104 2066 $0 $4,648 $0 $4,648 2067 $0 $4-352 s0 $4-352 Total $482,746 $234,441 $40,710 $757,897 Page 4 of 6

Duane Arnold Annual Cost By Account 2008 Dollars in Thousands Scenario No 4 SAFSTOR, License Extension, Yucca Mountain Opening 2025 Year License Termination Spent Fuel Greenfield Total 2032 $7,913 $0 $7,913 2033 $9,100 $1,256 $10,356 2034 $44,343 $19,657 $64,000 2035 $1,790 $22,910 $24,700 2036 $1,790 $22,910 $24,700 2037 $1,790 $22,910 $24,700 2038 $1,790 $22,910 $24,700 2039 $20,514 $6,688 $27,202 2040 $1,593 $3,949 $5,541 2041 $1,593 $3,949 $5,541 2042 $1,593 $3,949 $5,541 2043 $1,593 $3,949 $5,541 2044 $1,593 $3,949 $5,541 2045 $1,593 $3,949 $5,541 2046 $1,593 $3,949 $5,541 2047 $1,593 $3,949 $5,541 2048 $1,593 $3,949 $5,541 2049 $1,593 $3,949 $5,541 2050 $1,593 $3,949 $5,541 2051 $1,593 $3,949 $5,541 2052 $1,593 $3,949 $5,541 2053 $1,593 $3,949 $5,541 2054 $1,593 $3,949 $5,541 2055 $1,593 $3,949 $5,541 2056 $1,593 $3,949 $5,541 2057 $1,593 $3,949 $5,541 2058 $1,593 $3,949 $5,541 2059 $ 1,593 $3,949 $5,541 2060 $1,593 $3,949 $5,541 2061 $1,593 $3,949 $5,541 2062 $1,593 $3,949 $5,541 2063 $1,593 $3,949 $5,541 2064 $1,593 $3,949 $5,541 2065 $1,593 $3,949 $5,541 2066 $1,593 $4,492 $6,084 2067 $1,728 $4,234 $5,961 2068 $2,291 $0 $2,291 2069 $2,291 $0 $2,291 2070 $2,291 $0 $2,291 2071 $2,291 $0 $2,291 2072 $2,291 $0 $2,291 2073 $2,291 $0 $2,291 2074 $2,291 $0 $2,291 2075 $2,291 $0 $2,291 2076 $2,291 $0 $2,291 2077 $2,291 $0 $2,291 2078 $2,291 $0 $2,291 2079 $2,291 $0 $2,291 2080 $2,291 $0 $2,291 2081 $2,291 $0 $2,291 2082 $2,291 $0 $2,291 Page 5 of 6

Duane Arnold Annual Cost By Account 2008 Dollars in Thousands Scenario No 4 SAFSTOR, License Extension, Yucca Mountain Opening 2025 Year License Termination Spent Fuel Greenfield Total 2083 $2,291 $0 $0 $2,291 2084 $2,291 $0 $0 $2,291 2085 $2,291 $0 $0 $2,291 2086 $9,459 $0 $0 $9,459 2087 $14,542 $0 $0 $14,542 2088 $66,857 $0 $0 $66,857 2089 $84,866 $0 $0 $84,866 2090 $96,008 $0 $0 $96,008 2091 $73,393 $0 $0 $73,393 2092 $47,308 $0 $0 $47,308 2093 $11,373 $0 $25,401 $36,774 2094 $0 $0 $15,568 $15,568 Total $578,794 $230,632 $40,969 $850,395 Page 6 of 6

Decommissioning Cost Estimate Study Document No. 82A9634 for the Duane Arnold Energy Center Revision 0 Appendix F Detailed Annual Cash Flow Tables

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total Scenario No I Unit No. Unit 1 Cost Account A. License Termination 2012 $8,428 $34 $0 $205 $8,668 $1,132 $9,800 2013 $9,696 $39 $0 $236 $9,972 $1,302 $11,275 2014 $28,037 $12,906 $188 $1,327 $42,460 $5,821 $48,280 2015 $31,521 $14,466 $1,436 $1,543 $48,967 $6,941 $55,907 2016 $35,802 $7,868 $14,603 $1,895 $60,169 $10,826 $70,994 2017 $35,802 $7,868 $14,603 $1,895 $60,169 $10,826 $70,994 2018 $35,802 $7,868 $14,603 $1,895 $60,169 $10,826 $70,994 2019 $30,667 $7,934 $7,783 $2,212 $48,598 $8,357 $56,954 2020 $29,583 $7,945 $6,357 $2,277 $46,165 $7,839 $54,002 2021 $639 $171 $137 $49 $996 $169 $1,166 2022 $242 $197 $5,586. $680 $6,705 $1,458 $8,163 2023 $390 $317 $8,991 $1,094 $10,791 $2,346 $13,138 2024 $390 $317 $8,991 $1,094 $10,791 $2,346 $13,138 2025 $323 $263 $7,456 $907 $8,949 $1,945 $10,895 Account Total $247,323 $68,196 $90,735 $17,309 $423,570 $72,134 $495,699 Page 1of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total Cost Account B. Spent Fuel 2013 $1,096 $15 $0 $0 $1,112 $144 $1,256 2014 $7,888 $9,256 $0 $2,240 $19,384 $2,882 $22,266 2015 $9,185 $10,778 $0 $2,608 $22,572 $3,356 $25,928 2016 $9,185 $10,778 $0 $2,608 $22,572 $25,928

                                                                                             $3,356 2017                        $9,185       $10,778             $0          $2,608  $22,572                $25,928
                                                                                             $3,356 2018                        $9,185       $10,778             $0          $2,608  $22,572                $25,928 2019                        $3,032        $2,166             $0            $993   $6,191        $903     $7,094 2020                        $1,990          $711             $0            $719   $3,420        $489     $3,909 2021                        $1,990          $711             $0            $719   $3,420        $489     $3,909 2022                        $1,990          $711             $0            $719   $3,420        $489     $3,909 2023                        $1,990          $711             $0            $719   $3,420        $489     $3,909 2024                        $1,990          $711             $0            $719   $3,420        $489     $3,909 2025                        $1,993          $713             $0            $749   $3,455        $494     $3,949 2026                        $1,989          $711             $0            $889   $3,589        $514     $4,103 2027                        $1,98.9         $711             $0            $889   $3,589        $514     $4,103 2028                        $1,989          $711             $0            $889   $3,589        $514     $4,103 2029                        $1,989          $711             $0            $889   $3,589        $514     $4,103 2030                        $1,989          $711             $0            $889   $3,589        $514     $4,103 2031                        $1,989          $711             $0            $889   $3,589        $514     $4,103 2032                        $1,989          $711             $0            $889   $3,589        $514     $4,103 2033                        $1,989          $711             $0            $889   $3,589        $514     $4,103 2034                        $1,989          $711             $0            $889   $3,589        $514     $4,103 2035                        $1,989          $711             $0            $889   $3,589        $514     $4,103 2036                        $1,989          $711             $0            $889   $3,589        $514     $4,103 2037                        $1,989          $711             $0            $889   $3,589        $514     $4,103 2038                        $1,989          $711             $0            $889   $3,589.       $514     $4,103 Page 2 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total 2039 $1,989 $711 $0 $889 $3,589 $514 $4,103 2040 $1,989 $711 $0 $889 $3,589 $514 $4,103 2041 $1,989 $711 $0 $889 $3,589 $514 $4,103 2042 $1,989 $711 $0 $889 $3,589 $514 $4,103 2043 $1,989 $711 $0 $889 $3,589 $514 $4,103 2044 $1,989 $711 $0 $889 *$3,589 $514 $4,103 2045 $1,989 $711 $0 $889 $3,589 $514 $4,103 2046 $1,989 $711 $0 $889 $3,589 $514 $4,103 2047 $1,989 $711 $0 $889 $3,589 $514 $4,103 2048 $1,989 $711 $0 $889 $3,589 $514 $4,103 2049 $1,989 $711 $0 $889 $3,589 $514 $4,103 2050 $1,989 $711 $0 $889 $3,589 $514 $4,103 2051 $1,989 $711 $0 $889 $3,589 $514 $4,103 2052 $1,989 $711 $0 $889 $3,589 $514 $4,103 2053 $2,209 $778 $653 $624 $4,265 $615 $4,880 2054 $2,005 $695 $1,222 $216 $4,138 $601 $4,739 Account Total $118,612 $79,495 $1,875 $42,861 $242,845 $35,388 $278,23 Page 3 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total Cost Account C. Greenfield 2021 $19,357 $7,447 $1,335 $333 $28,474 $4,463 $32,937 2022 $4,901 $1,547 $208 $82 $6,738 $1,035 $7,773 Account Total $24,258 $8,994 $1,543 $415 $35,212 $5,498 $40,710 Page 4 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total Unit Total $390,193 $156,685 $94,153 $60,585 $701,627 $113,020 $814,642 Scenario Total $390,193 $156,685 $94,153 $60,585 $701,627 $113,020 $814,642 Scenario No 2 Unit No. Unit I Cost Account A. License Termination 2012 $6,963 $29 $0 $0 $6,993 $914 $7,908 2013 $8,013 $33 $0 $0 $8,047 $1,052 $9,100 2014 $25,720 $9,662 $495 $1,399 $37,276 $5,391 $42,672 2015 $282 $108 $0 $1,169 $1,558 $230 $1,789 2016 $282 $108 $0 $1,169 $1,558 $230 $1,789 2017 $282 $108 $0 $1,169 $1,558 $230 $1,789 2018 $282 $108 $0 $1,169 $1,558 $230 $1,789 2019 $3,352 $1,376 $3,646 $2,941 $11,316 $1,992 $13,308 2020 $298 $178 $1,705 $996 $3,177 $616 $3,794 2021 $298 $178 $1,705 $996 $3,177 $616 $3,794 2022 $298 $178 $1,705 $996 $3,177 $616 $3,794 2023 $298 $178 $ý1,705 $996 $3,177 $616 $3,794 2024 $298 $178 $1,705 $996 $3,177 $616 $3,794 2025 $293 $128 $427 $895 $1,743 $294 $2,036 2026 $291 $111 $1 $859 $1,262 $186 $1,448 2027 $291 $111 $1 $859 $1,262 $186 $1,448 2028 $291 $111 $1 $859 $1,262 $186 $1,448 2029 $291 $111 $1 $859 $1,262 $186 $1,448 2030 $291 $111 $1 $859 $1,262 $186 $1,448 2031 $291 $111 $1 $859 $1,262 $186 $1,448 2032 $291 $111 $1 $859 $1,262 $186 $1,448 PageS5 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total 2033 $291 $111 $1 $859 $1,262 $186 $1,448 2034 $291 $111 $1 $859 $1,262 $186 $1,448 2035 $291 $111 $1 $859 $1,262 $186 $1,448 2036 $291 $111 $1 $859 $1,262 $186 $1,448 2037 $291 $111 $1 $859 $1,262 $186 $1,448 2038 $291 $111 $1 $859 $1,262 $186 $1,448 2039 $291 $111 $1 $859 $1,262 $186 $1,448 2040 $291 $111 $1 $859 $1,262 $186 $1,448 2041 $291 $111 $1 $859 $1,262 $186 $1,448 2042 $291 $111 $1 $859 $1,262 $186 $1,448 2043 $291 $111 $1 $859 $1,262 $186 $1,448 2044 $291 $111 $1 $859 $1,262 $186 $1,448 2045 $291 $111. $1 $859 $1,262 $186 $1,448 2046 $291 $111 $1 $859 $1,262 $186 $1,448 2047 $291 $111 $1 $859 $1,262 $186 $1,448 2048 $291 .$111 $1 $859 $1,262 $186 $1,448 2049 $291 $111 $1 $859 $1,262 $186 $1,448 2050 $291 $111 $1 $859 $1,262 $186 $1,448 2051 $291 $111 $1 $859 $1,262 $186 $1,448 2052 $291 $111 $1 $859 $1,262 $186 $1,448 2053 $291 $111 $1 $859 $1,262 $186 $1,448 2054 $702 $240 $3 $958 $1,903 $281 $2,184 2055 $770 $261 $3 $972 $2,006 $297. $2,303 2056 $770 $261 $3 $972 $2,006 $297 $2,303 2057 $770 $261 $3 $972 $2,006 $297 $2,303 2058 $770 $261 $3 $972 $2,006 $297 $2,303 2059 $770 $261 $3 $972 $2,006 $297 $2,303 Page 6 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total 2060 $770 $261 $3 $972 $2,006 $297 $2,303 2061 $770 $261 $3 $972 $2,006 $297 $2,303 2062 $770 $261 $3 $972 $2,006 $297 $2,303 2063 .$770 $261 $3 $972 $2,006 $297 $2,303 2064 $770 $261 $3 $972 $2,006 $297 $2,303 2065 $770 $261 $3 $972 $2,006 $297 $2,303 2066 $6,523 $669 $1 $1,046 $8,240 $1,113 $9,354 2067 $10,616 $958 $0 $1,096 $12,672 $1,694 $14,366 2068 $27,485 $11,925 $12 $16,950 $56,371 $7,490 $63,862 2069 $33,425 $12,241 $8,888 $13,958 $68,513 $10,713 $79,225 2070 $40,755 $9,154 $28,475 $1,879 $80,262 $15,830 $96,091 2071 $36,861 $8,625 $20,592 $2,032 $68,110 $12,845 $80,953 2072 $28,208 $7,429 $3,393 $2,351 $41,383 $6,302 $47,681 2073 $11,036 $2,906 $1,327 $920 $16,190 $2,466 $18,654 Account Total $259,177 $72,669 $75,855 $90,838 $498,548 $80,846- $579,393 Page 7 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total Cost Account B. Spent Fuel 2013 $1,096 $15 $0 $0 $1,112 $144 $1,256 2014 $7,877 $9,244 $0 $2,237 $19,359 $2,879 $22,237 2015 $9,187 $10,781 $0 $2,609 $22,577 $3,357 $25,934 2016 $9,187 $10,781 $0 $2,609 $22,577 $3,357 $25,934 2017 $9,187 $10,781 $0 $2,609 $22,577 $3,357 $25,934 2018 $9,187 $10,781 $0 $2,609 $22,577 $3,357 $25,934 2019 $3,034 $2,169 $0 $1,024 $6,227 $909 $7,136 2020 $1,989 $711 $0 $754 $3,455 $494 $3,949 2021 $1,989 $711 $0 $754 $3,455 $494 $3,949 2022 $1,989 $711 $0 $754 $3,455 $494 $3,949 2023 $1,989 $711 $0 $754 $3,455 $494 $3,949 2024 $1,989 $711 $0 $754 $3,455 $494 $3,949 2025 $1,989 $711 $0 $754 $3,455 $494 $3,949 2026 $1,989 $711 $0 $754 $3,455 $494 $3,949 2027 $1,989 $711 $0 $754 $3,455 $494 $3,949 2028 $1,989 $711 $0 $754 $3,455 $494 $3,949 2029 $1,989 $711 $0 $754 $3,455 $494 $3,949 2030 $1,989 $711 $0 $754 $3,455 $494 $3,949 2031 $1,989 $711 $0 $754 $3,455 $494 $3,949 2032 $1,989 $711 $0 $754 $3,455 $494 $3,949 2033 $1,989 $711 $0 $754 $3,455 $494 $3,949 2034 $1,989 $711 $0 $754 $3,455 $494 $3,949 2035 $1,989 $711 $0 $754 $3,455 $494 $3,949 2036 $1,989 $711 $0 $754 $3,455 $494 $3,949 2037 $1,989 $711 $0 $754 $3,455 $494 $3,949 2038 $1,989 $711 $0 $754 $3,455 $494 $3,949 Page 8 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total 2039 $1,989 $711 $0 $754 $3,455 $494 $3,949 2040 $1,989 $711 $0 $754 $3,455 $494 $3,949 2041 $1,989 $711 $0 $754 $3,455 $494 $3,949 2042 $1,989 $711 $0 $754 $3,455 $494 $3,949 2043 $1,989 $711 $0 $754 $3,455 $494 $3,949 2044 $1,989 $711 $0 $754 $3,455 $494 $3,949 2045 $1,989 $711 $0 $754 $3,455 $494 $3,949 2046 $1,989 $711 $0 $754 $3,455 $494 $3,949 2047 $1,989 $711 $0 $754 $3,455 $494 $3,949 2048 $1,989 $711 $0 $754 $3,455 $494 $3,949 2049 $1,989 $711 $0 $754 $3,455 $494 $3,949 2050 $1,989 $711 $0 $754 $3,455 $494 $3,949 2051 $1,989 $711 $0 $754 $3,455 $494 $3,949 2052 $1,989 $711 $0 $754 $3,455 $494 $3,949 2053 $2,209 $778 $653 $489 $4,129 $595 $4,724 2054 $2,005 $695 $1,222 $108 $4,032 $585 $4,616 Account Total $118,612 $79,495 $1,875 $39,190 $239,174 $34,837 $274,011 Page 9 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total Cost Account C. Greenfield 2073 $12,037 $4,600 $830 $287 $17,755 $2,780 $20,535 2074 $12,627 $4,352 $713 $284 $17,977 $2,787 $20,763 Account Total $24,664 $8,952 $1,543 $571 $35,732 $5,567 $41,298 Page 10 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total Unit Total $402,453 $161,116 $79,273 $130,599 $773,454 $121,250 $894,702 Scenario Total $402,453 $161,116 $79,273 $130,599 $773,454 $121,250 $894,702 Scenario No 3 Unit No. Unit 1 Cost Account A. License Termination 2032 $8,223 $30 $0 $0 $8,253 $1,078 $9,332 2033 $9,454 $35 $0 $0 $9,489 $1,240 $10,729 2034 $27,960 $12,157 $1,267 $1,291 $42,676 $5,957 $48,632 2035 $31,447 $13,667 $3,189 $1,540 $49,844 $7,237 $57,080 2036 $35,738 $7,829 $22,235 $1,895 $67,697 $12,684 $80,380 2037 $35,738 $7,829 $22,235 $1,895 $67,697 $12,684 $80,380 2038 $35,738 $7,829 $22,235 $1,895 $67,697 $12,684 $80,380 2039 $30,705 $7,937 $10,032 $2,009 $50,686 $8,871 $59,555 2040 $29,627 $7,956 $7,441 $2,033 $47,061 $8,060 $55,119 2041 $623 $167 $157 $43 $990 $170 $1,160 Account Total $245,253 $65,438 $88,791 $12,602 $412,090 $70,664 $482,746 Page 11I of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total Cost Account B. Spent Fuel 2033 $1,096' $15 $0 $0 $1,112 $144 $1,256 2034 $7,885 $6,996 $0 $2,239 $17,120 $2,543 $19,662 2035 $9,187 $8,152 $0 $2,609 $19,948 $2,963 $22,910 2036 $9,187 $8,152 $0 $2,609 $19,948 $2,963 $22,910 2037 $9,187 $8,152 $0 $2,609 $19,948 $2,963 $22,910 2038 $9,187 $8,152 $0 $2,609 $19,948 $2,963 $22,910 2039 $3,027 $1,782 $0 $991 $5,801 $845 $6,645 2040 $1,988 $711 $0 $719 $3,418 $488 $3,906 2041 $1,988 $711 $0 $719 $3,418 $488 $3,906 2042 $1,992 $712 $0 $826 $3,531 $505 $4,036 2043 $1,989 $711 $0 $889 $3,590 $514 $4,104 2044 $1,989 $711 $0 $889 $3,590 $514 $4,104 2045 $ 1,989 $711 $0 $889 $3,590 $514 $4,104 2046 $1,989 $711. $0 $889 $3,590 $514 $4,104 2047 $1,989 $711 $0 $889 $3,590 $514 $4,104 2048 $1,989 $711 $0 $889 $3,590 $514 $4,104 2049 $1,989 $711 $0 $889 $3,590 $514 $4,104 2050 $1,989 $711 $0 $889 $3,590 $514 $4,104 2051 $1,989 $711 $0 $889 $3,590 $514 $4,104 2052 $1,989 $711 $0 $889 $3,590 $514 $4,104 2053 $1,989 $711 $0 $889 $3,590 $514 $4,104 2054 $1,989 $711 $0 $889 $3,590 $514 $4,104 2055 $1,989 $711 $0 $889 $3,590 $514 $4,104 2056 $1,989 $711 $0 $889 $3,590 $514 $4,104 2057 $1,989 $711 $0 $889 $3,590 $514 $4,104 2058 $1,989 $711 $0 $889 $3,590 $514 $4,104 Page 12 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total 2059 $1,989 $711 $0 $889 $3,590 $514 $4,104 2060 $1,989 $711 $0 $889 $3,590 $514 $4,104 2061 $1,989 $711 $0 $889 $3,590 $514 $4,104 2062 $1,989 $711 $0 $889 $3,590 $514 $4,104 2063 $1,989 $711 $0 $889 $3,590 $514 $4,104 2064 $1,989 $711 $0 $889 $3,590 $514 $4,104 2065 $1,989 $711 $0 $889 $3,590 $514 $4,104 2066 $2,156 $758 $523 $625 $4,062 $587 $4,648 2067 $1,926 $663 $991 $218 $3,800 $554 $4,352 Account Total $104,556 $61,315 $1,514 $37,229 $204,616 $29,829 $234,441 Page 13 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total Cost Account C. Greenfield 2041 $19,368 $7,452 $1,335 $333 $28,490 $4,466 $32,955 2042 $4,890 $1,542 $208 $82 $6,722 $1,032 $7,755 Account Total $24,258 $8,994 $1,543 $415 $35,212 $5,498 $40,710 Page 14 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total Unit Total $374,067 $135,747 $91,848 $50,246 $651,918 $105,991 $757,897 Scenario Total $374,067 $135,747 $91,848 $50,246 $651,918 $105,991 $757,897 Scenario No 4 Unit No. Unit 1 Cost Account A. License Termination 2032 $6,968 $29 $0 $0 $6,998 $915 $7,913 2033 $8,013 $33 $0 $0 $8,047 $1,052 $9,100 2034 $25,696 $9,662 $1,879 $1,397 $38,635 $5,704 $44,343 2035 $282 $108 $0 $1,170 $1,559 $230 $1,790 2036 $282 $108 $0 $1,170 $1,559 $230 $1,790 2037 $282 $108 $0 $1,170 $1,559 $230 $1,790 2038 $282 $108 $0 $1,170 $1,55 9 $230 $1,790 2039 $3,141 $1,244 $9,828 $2,938 $17,151 $3,365 $20,514 2040 $291 $1 $984 $1,388 $205 $1,593 2041 $291 $1 $984 $1,388 $205 $1,593 2042 $291 $1 $984 $1,388 $205 $1,593 2043 $291 $1 $984 $1,388 $205 $1,593

                                                    $111 2044                                    $291                          $1            $984    $1,388        $205       $1,593
                                                    $111 2045                                    $291                          $1            $984    $1,388        $205       $1,593
                                                    $111 2046                                    $291                          $1            $984    $1,388        $205       $1,593
                                                    $111 2047                                    $291                          $1            $984    $1,388        $205       $1,593
                                                    $111 2048                                    $291                          $1            $984    $1,388        $205       $1,593
                                                    $111 2049                                    $291                          $1            $984-   $1,388        $205       $1,593 2050                                    $291                          $1            $984    $1,388        $205       $1,593 2051                                    $291                          $1            $984    $1,388        $205       $1,593 2052                                    $291                          $1            $984    $1,388        $205       $1,593 Page 15 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total 2053 $291 $111 $1 $984 $1,388 $205 $1,593 2054 $291 $111 $1 $984 $1,388 $205 $1,593 2055 $291 $111 $1 $984 $1,388 $205 $1,593 2056 $291 $111 $1 $984 $1,388 $205 $1,593 2057 $291 $111 $1 $984 $1,388 $205 $1,593 2058 $291 $111 $1 $984 $1,388 $205 $1,593 2059 $291 $111 $1 $984 $1,388 $205 $1,593 2060 $291 $111 $1 $984 $1,388 $205 $1,593 2061 $291 $111 $1 $984 $1,388 $205 $1,593 2062 $291 $111 $1 $984 $1,388 $205 $1,593 2063 $291 $111 $1 $984 $1,388 $205 $1,593 2064 $291 $111 $1 $984 $1,388 $205 $1,593 2065 $291 $111 $1 $984 $1,388 $205 $1,593 2066 $291 $111 $1 $984 $1,388 $205 $1,593 2067 $381 $139 $1 $984 $1,505 $222 $1,728 2068 $763 $259 $2 $972 $1,996 $295 $2,291 2069 $763 $259 $2 $972 $1,996 $295 $2,291 2070 $763 $259 $2 $972 $1,996 $295 $2,291 2071 $763 $259 $2 $972 $1,996 $295 $2,291 2072 $763 $259 $2 $972 $1,996 $295 $2,291 2073 $763 $259 $2 $972 $1,996 $295 $2,291 2074 $763 $259 $2 $972 $1,996 $295 $2,291 2075 $763 $259 $2 $972 $1,996 $295 $2,291 2076 $763 $259 $2 $972 $1,996 $295 $2,291 2077 $763 $259 $2 $972 $1,996 $295 $2,291 2078 $763 $259 $2 $972 $1,996 $295 $2,291 2079 $763 $259 $2 $972 $1,996 $295 $2,291 Page 16 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total 2080 $763 $259 $2 $972 $1,996 $295 $2,291 2081 $763 $259 $2 $972 $1,996 $295 $2,291 2082 $763 $259 $2 $972 $1,996 $295 $2,291 2083 $763 $259 $2 $972 $1,996 $295 $2,291 2084 $763 $259 $2 $972 $1,996 $295 $2,291 2085 $763 $259 $2 $972 $1,996 $295 $2,291 2086 $6,516 $667 $1 $1,147 $8,331 $1,127 $9,459 2087 $10,600 $957 $0 $1,267 $12,824 $1,717 $14,542 2088 $27,572 $12,589 $13 $18,843 $59,017 $7,839 $66,857 2089 $35,136 $12,003 $13,193 $12,472 $72,804 $12,062 $84,866 2090 $40,755 $9,154 $28,475 $1,806 $80,190 $15,820 $96,008 2091 $34,952 $8,361 $16,797 $1,912 $62,023 $11,373 $73,393 2092 $28,208 $7,429 $3,393 $2,027 $41,058 $6,254 $47,308 2093 $6,781 $1,786 $816 $487 $9,871 $1,503 $11,373 Account Total $257,437 $72,134 $74,470 $94,036 $498,085 $80,715 $578,794 Page 17 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total Cost Account B. Spent Fuel 2033 $1,096 $15 $0 $0 $1,112 $144 $1,256 2034 $7,883 $6,994 $0 $2,238 $17,115 $2,542 $19,657 2035 $9,187 $8,152 $0 $2,609 $19,948 $2,963 $22,'910 2036 $9,187 $8,1512 $0 $2,609 $19,948 $2,963 $22,910 2037 $9,187 $8,152 $0 $2,609 $19,948 $2,963 $22,910 2038 $9,187 $8,152 $0 $2,609 $19,948 $2,963 $22,910 2039 $3,030 $1,784 $0 $1,023 $5,837 $850 $6,688 2040 $1,989 $711 $0 $754 $3,455 $494 $3,949 2041 $1,989 $711 $0 $754 $3,455 $494 $3,949 2042 $1,989 $711 $0 $754 $3,455 $494 $3,949 2043 $1,989 $711 $0 $754 $3,455 $494 $3,949 2044 $1,989 $711 $0 $754 $3,455 $494 $3,949 2045 $1,989 $711 $0 $754 $3,455 $494 $3,949 2046 $1,989 $711 $0 $754 $3,455 $494 $3,949 2047 $1,989 $711 $0 $754 $3,455 $494 $3,949 2048 $1,989 $711 $0 $754 $3,455 $494 $3,949 2049 $1,989 $711 $0 $754 $3,455 $494 $3,949 2050 $1,989 $711 $0 $754 $3,455 $494 $3,949 2051 $1,989 $711 $0 $754 $3,455 $494 $3,949 2052 $1,989 $711 $0 $754 $3,455 $494 $3,949 2053 $1,989 $711 $0 $754 $3,455 $494 $3,949 2054 $1,989 $711 $0 $754 $3,455 $494 $3,949 2055 $1,989 $711 $0 $754 $3,455 $494 $3,949 2056 $1,989 $711 $0 $754 $3,455 $494 $3,949 2057 $1,989 $0 $754 $3,455 $494 $3,949

                                          $711 2058                        $1,989                          $0            $754  $3,455        $494      $3,949 Page 18 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total 2059 $1,989 $711 $0 $754 $3,455 $494 $3,949 2060 $1,989 $711 $0 $754 $3,455 $494 $3,949 2061 $1,989 $711 $0 $754 $3,455 $494 $3,949 2062 $1,989 $711 $0 $754 $3,455 $494 $3,949 2063 $1,989 $711 $0 $754 $3,455 $494 $3,949 2064 $1,989 $711 $0 $754 $3,455 $494 $3,949 2065 $1,989 $711 $0 $754 $3,455 $494 $3,949 2066 $2,156 $758 $520- $492 $3,926 $567 $4,492 2067 $1,928 $664 $994 $109 $3,696 $539 $4,234 Account Total $104,557 $61,315 $1,514 $33,913 $201,301 $29,334 $230,632 Page 19 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total Cost Account C. Greenfield 2093 $14,929 $5,648 $1,030 $358 $21,966 $3,436 $25,401 2094 $9,602 $3,168 $504 $213 $13,486 $2,081 $15,568 Account Total $24,531 $8,816 $1,534 $571 $35,452 $5,517 $40,969 Page 20 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal Contingency Total Unit Total $386,525 $142,265 $77,518 $128,520 $734,838 $115,566 $850,395 Scenario Total $386,525 $142,265 $77,518 $128,520 $734,838 $115,566 $850,395 Page 21 of 21}}