Text

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)
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{{#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: Lisa J.S. Wjker, Senior Cost Engineer 11/20/08 Date Approved By: Bar Sims oct _11/20/08 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Revision I Report Rewrite Effective Date 11/20/08 Electronic documents, once printed, are uncontrolled and may become outdated.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 G eneral D escription.............................................................................................. 11 3.2 Schedule A nalysis............................................................................................ 11 3.3 Decommissioning Staff........................................... 12 3.4 W aste 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 R E FE R E N C E S................................................................................................................... 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 for the Duane Arnold Energy Center Document No. 82A9634 Revision 0 Table 1-2 contains Spent requirements. Fuel Management costs, which correspond to 10 CFR 50.54 (bb) 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 demolition and site grading and re-seeding. such as clean building Table 1-3 Greenfield Cost Summary by Scenario (2008 Dollars in Thousands) 1 2 3 4 34U, / IU $41,298 $40,710 $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 for the Duane Arnold Energy Center Document No. 82A9634 Revision 0 Figure 1-1 DUANE ARNOLD ENERGY CENTER SCENARIO 1

SUMMARY

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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 - $1 00.00/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 for the Duane Arnold Energy Center Document No. 82A9634 Revision 0 10 CFR 20 10 CFR 50 10 CFR 61 10 CFR 71 10 CFR 72 29 CFR 1910 49 CFR 170-189 Reg. Guide 1.159 Standards for Protection Against Radiation Domestic Licensing of Production and Utilization Facilities Licensing Requirements for Land Disposal of Radioactive Waste Packaging of Radioactive Material for Transport Licensing Requirements for the Independent Storage of Spent Nuclear Fuel and High-Level Radioactive Waste Occupational Safety and Health Standards Department of Transportation Regulations Governing the Transport of Hazardous Materials 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 for the Duane Arnold Energy Center Document No. 82A9634 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 Class B Class C GTCC 377,714 1,866 756 128 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 for the Duane Arnold Energy Center Document No. 82A9634 Revision 0 Figure 6-1 DUANE ARNOLD ENERGY CENTER SCENARIO 1

SUMMARY

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

I....

M~. pe.. i Fueli Shipping to DOE Repository Begins Spent FPel Shipping Complete Ir 8-FoolI Pool late. ofDesign D d - SpenuFe Cooling and Trt*nsf r to Dry Storage Dry Pd 3 - Dry Storage During Decommissioning Dry - d 4-Dry Storage On.y Dry Pd 5-ISFSI D nconmmissioning Licnsenn TerInatnelt Decon Pd 1 -Decommissioning Planning Prior to Sh utdown .floAo Pid 2-Site Modlfiat~nslon nd Pureparottono -00.00 Pd Motor Compo nent Re i o a] fOcon Pd 4 - Balance of Plant Decontamination Deconl Pd S - ntrmWe SrgePolliity Operation, Grn Pd 1 - Clean Building Demolition iGn Pd 2 - Site Restorllton 6/2212013 212112014 212 112014 21/82012 22112014 21812012 31"112019 5118/20i22 117/21121 22412022 10/21/2054 2/21/202 212l: 2.2215* '21i. --* 2

O19 10121/2014 W. i i

i i i i i i i i i i l 10/3012025 E-: i i i _7/27/20530m~ i1030/2026 2121/2014 2121 21211120 4 -1211 20 15 3/4/2019 11/7/2021. N 10D/30/2 025 022 Page 35 of 58

Decommissioning Cost Estimate Study for the Duane Arnold Energy Center Document No. 82A9634 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 for the Duane Arnold Energy Center Document No. 82A9634 Revision 0 Table 6-2 Scenario 1 DAEC Staff Levels Aoministrarion Engineering Health Physics Management Plant Maintenance Plant Operations Quality Assurance Security Administration Security Guard Force Waste Operations .2! 21 2U U.2-7.75 25 21 17 0.25 3.25 27 25 34 0.75 2 2 2 1.5 27 16 5 0.25 3.75 31 32 17 5 3 1 0.5 2 2 3 3 12 12 12 1 2.5 29 21 20 0.25 22.25 160 134 111 2.5 Spent Fuel - 50.54(bb) DAEC Staff Depart*new >i Pd*' ,Dri 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 Engineering Health Physics Management Plant Maintenance Quality Assurance Security Admin Security Guard Force 9 7 3 2 3 2 5 8 5 1 1 1 1 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 Pirten ~dI Pd 2* PdJ 31 ~ l Pd5 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< (IM .GPd 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) K'aih, midsf Wast ast (1ack egi oltltB ((T Volne ((T) ' (YAost C osP t 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 for the Duane Arnold Energy Center Document No. 82A9634 Revision 0 Figure 6-2 DUANE ARNOLD ENERGY CENTER SCENARIO 2

SUMMARY

SCHEDULE Etm tt F-.I Shlppltt t. DtOE 8.thtat flg1 Dry 0 Pd 2. Gp.10 FatI Coohlln ,ttd Ttm.,t. W Dry Stth.. 9 -ý I0 S 2 d.wOP0RP.It ttt.thd. -.- AFSOOR Pd 3. AFSTQ8 Plwp~titt. otoma Dvdn,.W~t Fuel iWots SAFOTOR Pd 4. C-ttp.11-t 01 SAFSTOR P-.6-~i~t SAFSIOR Pd 5.-D Ot... V Wth 1-H., W.-t.. td Sty SpMn F-St...g -SF IORP -d ttttt With DtS~tg SAPSTOWO P87 Dt.tt.y t--t---- BAPS T01R Pd Dm.Alatt 2 lntshtt mettt.ty sAPeoTR Ed-o:

,tt~t,..,t shit Mdcattt1nz., a GAPSTOR PEd0. M.). C-tt-.ttt R.tt-.,

5 AFSTOR Pd IT.51 O.tll tltIt .um1 66.t7777 I~l,7 Om0t Pa.ht..tt uwtw.idtg ttttF 1 2-12074th -wm .lmtio1 M~i1 14 1/1 kl59jO 2 3 ?'i21 I Iiix .t. 2 motitOS I qvY:: ý ý ý : /2- -2 iI~.~q i.... I ' ' l ' ww, Page 41 of 58

Decommissioning Cost Estimate Study for the Duane Arnold Energy Center Document No. 82A9634 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.ý IS c5R SAFSTOR SAF\\[ý§OR~ 1AFSTO'R SAEýSTOR -, SAFSTOR SAFSTOR 'S,( iSTOR I'q I01R' SA/FSTOR SAFSTOR Neprt~n I df~ Pd 2 I'd3 P'd4 I'd P5 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* 3 Dr4Pd wDry 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~d 2'7 N d Ill1 6 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 Surcharge 4 i~ Base *Buial, T~otal acjynaýs Vil&s Volste(CF Volriml ranspo oalo &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 for the Duane Arnold Energy Center Document No. 82A9634 Revision 0 Figure 6-3 DUANE ARNOLD ENERGY CENTER SCENARIO 3

SUMMARY

SCHEDULE Spent Fuel Management 61231203i3 Spent Fuel Shipping to DOE Repository in Progress 2/21/2034 S pen IT Fuel shippi-n-g -Com-.-peI-ate 212312067 Dry Pd I - Fuel Pool Island Design 612312033 bry Pd - Spent Fuel Cooling and Transfer to Dry Storage I 2/2112034 Dry Pd 3-Dry Storage During Decoommissioning 2/2112039 Dry PA 4 -Dry Storage Only------------------ 1824 Dry Pd 5 - ISFSi Decommissioning 7128/2055 License Termination 1 2/1812032 Unit I Shutdown 2/2112034 Decon Pd 2 - Site Modifications and Preparations 2121/2034 Deo d3-Major Component Removal 12/112035 DBcon Pd 4 - Balance of Plant Decontamination 3 nin Pid I - Cl-an Buldaing Demoiltion 1.. 2041 Pd.2. - Site-e*atoraetin. 24i/2 -42 Finish -i 1:.11 1 16 1716 8 'Jhl iilfi 21 J~jl~533' 10/23/2067142~227212331 2/21/2034 2/2312034 212112039 511812042 10R23/2067 -S/26 W42 2/21/2034 -V21212634 12/1/2035 3.. /412039 3511o20Q 2/21 lop VOW m... I - I ?123 Page 48 of 58

Decommissioning Cost Estimate Study for the Duane Arnold Energy Center Document No. 82A9634 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 asteit andea~BuCassia1h (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 for the Duane Arnold Energy Center Document No. 82A9634 Revision 0 Figure 6-4 DUANE ARNOLD ENERGY CENTER SCENARIO 4

SUMMARY

SCHEDULE 0,4 Pd I. -o-1 K-o /022 /1- -1RP24IdFI,1-1 1,/o _- 11-o P1 I0- 8AF8TOR P-- 1 2 1.tIo -.c OýIý Sp SAFSTOR Pd 02 wO iM2/91// N1,; DmfNO st-./j ASAFTOR Pd B-DI-ft- .21,11. UIflIo/Iy,, ,p./o i//0l'dO s//...o-./0 m -- -~ý 2/11-14!1-2-1/20Q'

2/N 1/-1007 21 wton R"Zimini3 2*I~~~

Ii 100101/1~~~~~ Il -~'/ooio,'ooo//2i4so,,'oo, 7~000~0~~' R2'1'7/2. 5 940_ -1 2,1ý3 124S ýi 'e iS i -6 i 0/'ONii '-9 w '-9 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 Pd ~ c2. I' ~P3t 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 AFSOR SAS~d~~ S~STR ~SAFTOR

SASTOR>

\\A1ýTOR VSAFSTOR ~SAFSToR SFSb I'llitmnt Iy 7 P 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 for the Duane Arnold Energy Center Document No. 82A9634 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 A3 Iý:11se1 L B uia( I il 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 for the Duane Arnold Energy Center Document No. 82A9634 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 Printed: 10/17/2008 8:21:11 AM Page 2 of 3 Printed: 10/17/2008 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 Printed: 10/17/2008 8:21:11 AM Page 3 of 3 Printed: 10/17/2008 8:21:11 AM Page 3 of 3

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

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

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

Decommissioning Cost Estimate Study for the Duane Arnold Energy Center Document No. 82A9634 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 tgA6 S1[7 31411516117118[1l9 2021 22I231241ýl627I28i29l3Oll2 l3rT2I33134I2Sl281371338I914SI4II42I42I44 I Spent Fuel Management ý2 Spenit Furel Shipping6 to DE Begins --* '*p* i;* fsi~~i};*i~i* D*E' B~g~n. 3 i Spent Fuet Shipping Complete........... --T -!................

e~gr*s*;;*,e* i* ;;ag * ;;* ;i* *i~iii* ;J*;*;......................

4 Dry Pd 1 Fuel Peel island Design ....3 " 1................. D ry 6

r ~ ~ o ~ di c ~.......................

S Dry Pd 1 BEgd*s 6 Dersign Spent Fuel Suppnrt System Modifications "'"i* i ci " s i s.........;o n ~ g......... 8 eldgn Spent Fuel Storage Security Modifications g ry 1lind 1o DryiPd 2-Spent Fuel Cooling and Transterto Dry Sterage II Dry P42 Egn "-'T 7 -i.................

*i ai* *

"; i~io*zo~ ;;i ag*M du...............

12 T-Install Spent Fuel Pool System Modlifications. 14 Implem ient.spent Fuetpol PnSecuijty Modification 15 Purhase f Dry Storage modules for Fuel Assemblies 176ý Spn uel oo Empty ...* *; ;;i*;* iiR ii }* o o; m s;o ng fR 17_ D ryPd 2Ends 18 Dry Pit 3 -Dry Sorage DurnegDecomnmissioning D ; "

e i.........

20 Dry Pit3 Eircs ....... ~ ~

6

~...... 23 1 Dry Pd 4 BEgnds 23 D.............. ry......... P s... 24 Dry Pdt B - S1 Dedcommissioning 25 iDr Pdi 0 begins 28 Prepareion and NRC RLeiem of Ucense Termination Plan 27 . Vedieri.aio nSurv y of Ho rizo t t ran, e M"oduls 28 1 Preparation of Final Report on Dec-ormniisnling end INRC Review 30 Dry Pd 4Ends _31 Lý_cense Termination ice n~ e ~ c[

t.

_33-bacon Pid 1 - Decomnmissioning Plaonring Prior to Shtrudown Dec. Pn 1 i h..

a.

d iý g

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A o............. 35 Prepare rison Notification of Cessation of Operatons 36 Prepalare Wrnitten NotificationofFeRmvafrmVsl 37 deconrr 1nnsinng Planning anmd Design. 38.Planning aod Design of Site Characterization 38 i Prepare integrate. Work Sequence and Schedule for Decomnmissionrng 40 Prepare Decommissioning Activity Specifications dl Prepure License Terminatioan Plun 42 Prapar Detiled WokPoeursttDcTms nn .31 Preparation of Decomndssioning License Documents 44 Plurrnfin and Design of Site Repoweneing 45 Administrative Activities D48esign ontolomeni Access Modificaioins .Planning and Design.of Primary System Ducontandilnation Plaianolg for Astesiec Abiatemnti .elect Decommissionring General Contractor 50 be.whg Interim Storage Facility for Greater than Class A Waste .Detcmi Pd.1Ends. 2157A wk. 812312013 10/2112054 S rb 2/21/2027 2121/2027 0 wlre 2i22/205. 2 12054 62*i o' I~ i i* i......... 5 ndrs 6/23/2013, 8/22/2014 3tiwho 812/213. 6/201 325 inks 87142013: 2121/2014 ........ wk 64M* T .~o 0 1....... / 0-I-25 wrs 2 6/2/014 221/2014 20 wks i........ 9ff& o144 281.2 ~obs.212112814. 2/2112019 0.... 01(5 *2121204i

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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 Start I Finish -1 1 ID I l... -. m. .1 5uration InP J I nW.nJ+/-LIjriU .77+/-&+/-35.I+/-U.iO.1.IY '-~ i~ 52 i Decon Pd 2 - Site Modifications and Preparationsi 5-!3-Decon Pd 2 Begins........ 54 Perform Baselne Radiation Survey...................... 55 perform Priarty Smtm ueo tariation and.Place Waste in ntSterimb i................................... 56 Plush and Drain Non-Essential System and Place Waste in Intenrim St, 57 Perform Hot Spot Rem~oval and Place Waste in Interior Storage. 50-7ý. PFinalize Residual Radietion Inventory

-* 7 i~

~ ~ ~ ~ ~.. iii i i i ll i..................... 56 Selec ShippinrgCasks and Obtain Shipping Permnits 60 Oeipn. SpNcity, aind rour Spec;,'lati.lterrms and Matarials ** , is... -617

Modify, Containment Access 62 CosrcIe hneRomHtLudy n-Plant Laydown Areas 63 Repower Site acstSpecial Ctigai adn qipetadTaoOeaa 65 Procure Non-Engineered Standard Equipment 66 o

i"Asbestos AMbatement.................. 67 Construct inteatm*Stoqrgag Pacity tar OrGeater th 1.1an Clzass1 A Wa.ste 678-Decon Pd 2 Ends 69 6 Decon Pd 3 - major Component Removal ... D ~ o n P d B e~ i*........................ 70 Decon Pd 3 Begins 71 Remove, Pa-ckag~ee~n~d Disposna.oNon-Essenlal Spotems' 73 Decon Shield Plugs, Pool Plugs and Stud Tensionems 7 Volume Reducca Cantrol Rod glardes end Fuel Channels and LPRM~S ar' Segment anrd Dispose of Drywell Head 76 urchane Dry Storagem ki Modle dtar G CWSte -I F!.. . ~a size in*temai and Vesisi SegeingR16 Details -j Segment* Para.g. nii Plane Reactor Ineiirna i n intaji storage 79 I brain Dryer Separator Pool end Process Liquid Waste 80 i Reactor Vesisel Insulation.RmvladDisposal Remonal and Disposal of Sacrificial Shield Wall 83 Remone and Dispose at-Ha-ardou Waste---------- 64 -l Decor Pd 3 Ends .......ii........................ ii r.i ~i £. -~ai i i i ~ i i oi.............................. 65 Decon Pd 4 -Balance at Plaet Decoetamination 9 D e o i

a * £ g 66...

De. r Pd 4.in.......... 67 Remove and Dispose at Spent Po~et Storage Rackis ....i " i............... i ii i ii i ; i i 'i' l i *: ; i 1 i......................... 88 Drain Spent Fuel Pool and Process Uquid Waste 89 Segment, Pac g and Dispose af Refueing Bridge 90 Segment, Package and Dispose of Spent Fuel Pool Island Equipment g1 Remove, Package and Dispose of Remaining Active Plant Systems 6 Decon Reactor Building 106 Decon Tarbine Building -T ' ....O i r i .. i... Its i Decen Radmaste Bailding 122 1 Dawon HPCI and RCIC Buildling 1B12 i ecor Administration Building 124 Decon Ott-Gas Reenio6n bailding ...T'* "............. bacon tCl:k

Swijr~ eý iiai Pro iri~iij Builingi 128..................£iimi~i~~iiiigi££6i£*i ii~iii~iiiii i£Y

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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 -Task Name________________ DuraSqy~J~jtart Pinish kTak Name-130 Final Status Survey for Structures 13 11 Frinal Status Survey for Land Areas 132 Prepare Final Report of Dismantilng Program 1-i33 Decon Pddg nds 34 Docon Pd 6 -Interim Waste Storage Facility Operation 135 Decoae Pd 5 Begins 136 , Greater Than Class A Waste Facilty Opens 1-3-7 Transport and Dispose of Greater Than Class A Waste in Interim Storag -1T3-6 !, P erform Fina StatusSurvey aoft*nteo in Waste-Storage Fac Ity. 136 : Clean Demolition ot Interim Waste Storage Facility 140 Decon Pd 5 Ends 141 Grn Pd I - Clean Building Demolition .42 Gm Pd! Begins 143 Clean Building Demlition Equipment 144ýt Install Temporpry d6*ce Buildings. 45 Demol.sl Low-enetR vdwasie Building 14 D.eolish Turbioe buidiing 147 Deralish Data Acquisition and Technical Support Building 148 Demoish Control and Administrative Buildings 14'

i...................Je m ~ h G uS*d a~ it......................

T ............... D n ois " I i'"n R i "iu B *............. "......... I50 Domroish 'HPCI and RCIC Building" 151 D. motsh Reactor Building........................... 152 Demolish Coonig Towers and Related Structures 153 Demolish Training Center 154 Demolsh.Plen Support Center Remov ande Dispose ofiUnderground Storage Tanks -{ -* 'e

i~ sp s

T k...................

156 Demolish Off-Gas Stack 107i.... Wnii E**ing Waste Water Treatment 1...... i h Remainirnlng Structures 159 Gm Fid 1 Ends 160-- Gret Pd 2-- gito Reosto-ratio-n------ 161 G d2Bgn 1-]62"-i....... Site Restoration Equipmen.t........... 63"' Remove Temporary Structures 164 F nish Grading an Re e Ste s G...................eV t S .Gm 2 Pd 2 Ends........... __Rur~abn 1, _Sta rt _L rni§h.... 318 days, 712102019 10/8/2020 310 days 1317/2019 10/6/2020 13wks 10100020 I 1/72021 0 w.. w 1 /202I 127 2 160 I wks 5118/2022 10/3012025 Se rs 5110002 5/10/2 4.4 inks V112025 1/30M2025 29 iks 212025 8/21/2025 . wtk

61240025 "

/2512025 5 9whs 9/282025 10i30/2025 S who lld/u 103122 -fyioiYidbS 66 winks 117/2021 2/2412022 0 who 1/7001 V 02wks 1/702021 101/2021 2 w2 s /7/2021 /21/2021 2 wk,: 11MO0V V ""i tibl 6 who 1/210.2021. 3.4/2021 14 inks 1/21.02 4O9202 2 wks: 40200221 513/2021 6.w.s. 4/2912021 6/10 2021 3ma 4/25/2021 5/20/2021 2 who 429 021........... 2.. i1aths 6/902021 10/14/2021 4 wk, 10/14/2021? 11/11/2021 2 whs 10/14/2021 10/28/2021 4 ks 101412021 11 /11/2021 3 wk 10/141C2021: 11/4/2021 3 whs 11 /110ý021 1 2/3202. 1M 11,1102021 11/16/2021 wks 1 V1 1/2021 24/241022 0.... 2/240022 2 .i/24022 12 who 2/24/2022 5118/2022 v wks 2/2402022 2/24/2022 2 wks 2/124022 319120 2 who 3s/6022 302 /222 6 vitr 3/220.22 5/10/202 '-ILUjjl3JAL5j 628jIj22l2321314-2 7l28j75j ~ff31jj3lj3l6/73jjflJ ~~ 45 16/26 L 2124 042124 5118

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

TeskNeme N.-

a--*T* id; -i. *.......................... 8 Spent Fuelf Man agemrent 2 Spent FuelIShipping to DOE Rop.a/orssy

Begins,

ý3 Spent lFuell Shipping Cornp.le ...... * '*'* 'S '* * ;i *;........................................................................ 4 Dry Pd I Fuel Pool Island Design D ry Pdl1 Begi.. ge n "S p n t'Fu i a Su pp ' rt, yata ' Mo difi c bo n................................ 7 Obegn Control Room Reloe*ton a Deegn Spent Fel Storage Security Modificatioon D ry PdlEride 10 Dry Pd 2a Spent Fuel Cooling and Transfer to Dry Storage 1 i Dry Pd 2 Begins -7iT"-. /nsla Spe~t Netl owe sjsten Modyneatons 13 Im~ntConlol Rýoon MoF latn 14 Inrplemrent Spent Funi PoQ Security mociteeiene 15 Fu oetf Sty Storage Module. for Fue-1 Aeenbl.. 16-C Spent Fu.tI Pool Empty. 1T7-4 St Pil2 En, d 21 Dry Pd 4 Dry.StorageomiSnggoon ny 719 Dry Pd 3 Ben. 20 Sty Pa 5E~rds. dni' h~ **.............. 1 Dryd 4 A S FSISAFSTORclanisning. 22 SrTy P d 4 Be gi 24 Venflostfrn Survey of yoyoenwl Storage Module, 25 PrepareWen Notf fine o Rewpon bofl.nRemonlng end NRC RV. 24 Clean Danrlibo~nof I SFS1l. 27 Sty PrepaeF .TOR Pd. 28 etenpnar FO 29 0011 ituldoon, 30B P dep SATFST OR Pantnvny Prio Stont$ o 31 PreaFre t i 32 Flpretae Wrien Noeaborn ofCeetan 01 Operaison 7 * =......... T O 33 Prepere Mann00. Nombueon 01 Fuel Removal tnmm Vessel 34 SAFSTOR Pl6rocg and Dnesign 35 Planning fo.SAFSTOR Baseinee Radiation Survey 4 B........ 34 j Plep-SAFSTOR Plan 37 P*p. of SAF' T O R L.. .. en. D tn........................ " -* 7 -]......... A

S ~ i* a "* *,*,..................

30 Pnepare SAFSTOR Integrated Workbc1,.du. 39 Prepete SAFOTOR Audunly Spnoloeeon. 40 'a~drmstrathuActrdib, in Prpanetont oi spFol0 41 Prepare 0etailed SFSTOR lýýnk Proced.rn 42 P/rig11AbeoAbemn 43 Select SAFTOR General Conratora S F i F 3 a .4Planing ad! esign ofPrimaery Sysem nDcortmmeosfon 45 SAFSTOR Pd!1 End.- 44 SAFSTOR Pdi2 -.SAFSTOR Pralpara..f Foolimm.ng 6held.m. 47 SAFSTOR Pd Begtns. 4 ProrNe-1,rgi-ad. 4ed-Suprr For SAFSTORPeprne 49 Perloo Prnrery Syelm Oecontimnriebon arcd Pbace Wesel In Interim Storage SO F Dei. r-and be E-neio No-,eni Syaom sand Seur 5t; 5-1 Srin: end Pmoeee. Suppreeeir Pool Wate.r end Hydrol.. Tonte Web S3 G-rarelAns.Cle-ru A-1-lo Abatemn I Rennrtuorrd Oro'ep ad of Hea-sr-do-u-W W at.......... e... 56 P~repare sAFOtdk Reyort. 57gT SAFTOR Pd2 Ends. 559-SAFOToR OFd 6egi 61.SAPSTOR Pdl 4 - Contplakiom of sARSToR Plepanedene 42 SAFS d ~Bege DUAN ENRG TE SCNAI DEAIE E 2171 mWas 6/2312013: 1012112094 ........ ) ' 0 W1=i27 20102027 001,0 2/2i24 2721Q1205

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DUANE ARNOLD ENERGY CENTER SCENARIO 2 DETAILED SCHEDULE SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Storage Class B3 and C Waste ID Task NI-n l ~ 63 F. n... , R. l P a. a o. n 2812019 6 Raonrl and Interlim S/orage of/Span/Rasirn. Filt "IMed rnd Ta.kSkd*ei. 2,A... 8/2019 l 8120f2019 67 Seomnro Pack0. Ig e an ipofsI pent FuelPoolIslIand Eqoiipinret5 06 91-2 1/1201 9 9124120119 69sea.t fl .26 91251121V 12 117/2 019 U9 S FS6 RPd 3 nd. 1 1 1211720* 9 70 5AF9OR Pd 5. Soelanop Ni/5 islaert Wa.l. and Sry spenf Fool 810100 vs75.8 wk-a 1l211712019 4/i166A2 71 SAFSTO9~a Pd5egins 0 oýe 12J 2C1720. A i2/.7129. 72 Tnansor&Diao of GrtarThanCla A Waitr nIterStorage 1 a /l/2025 4/112025 .SAsrR Pd 5 En.... k......... 7 S SAFSTOR Pd g -Dormsnny Nth Dry Storage 1507A wkr 41112029 2/2112054 76 Bitrnrinorra Roof Rep/a.. nrnt 10o.69s 4/51203 9/131204 77'- SAFOTOR Pd 6 6di 0 vv. 1212~0t.212V054 79 SAFST6iORPO7 - oano/Oy. 640.609 2/21/2054 61112068 79 OAIPSTOR N egn b./I "~a.w272/254: 2/21204 uumno R*- Rplmmnt10 ,1/0.412312094' 7/11254 91 AlpSTO9d iind, 006 /11/2066. 6/112069 92 mS u 'TORPd A -................. planning During non.. 6//.... IT./../.................... 9 1..6/1..20 .1120. I.6*1. .sA OR Pd k.../' 09 84 `oorrr.o,ngPanig

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86.

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DUANE ARNOLD ENERGY CENTER SCENARIO 2 DETAILED SCHEDULE SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Storage Class B and C Waste U - lasoName J//craOon 566a7 51r9090 .... i.. ur.... 5tart il Fi* .25. .Re.-v Underground S.or-Dra.ns and Manholes. 101/26 1071 8/3"071 126 SAFSTOR Pd 10 Ends .0.......17.2071......71 1327 SADBOR Pd I ui .31W Dwonlanngna11on 79 wks 9012071 1/20/2071 128 SAFSTOR Pd 11 Begin.0," f/7 9/27 161 DenOf-Retento Building g2 29.A 12 m /1307.12'72072 153 59... RD 'Svn 'ad/ nadt. B 1uildin 1... .1.0..1 9/ 18/1f/2071 11/24/2071 159 .. oegm mnt ci Odic bu1 Dild o n m t n u t dT l.......... . 2 i" " "1. '1 071 12W2071 161 Deco nUt 09tat. au1.ndor 6drao 2u9 Wks 11132071 W2077 162 ........Fon~lLWl"u

rg.and Ar...

...d. 49w "12070071 2104072 162ý Dec01 07-0.9060tak 4,0119 1=207071 104072 164 Diiawn a9fld 0-- -ar r-- an 1207/2071-1/31V207 165 SsgcrenC Piackage and Di80 of Confllar,inad Decon Equip,r,..njnd T-oi~ng 2 29. 1./131. I./20712.2/11-4002M ...~~~~~~~ ~~~~~~.... S/ F 'O ~ " n s 0 0 3 / 3 2 7 166 P6r"ot inn Staws Scn.y o1 Interimn V/bet. Storge F-icity1072 3202 167 naSdalSrT R o ance 9,152071.221/2074 168 /.~~c~lelrade 19,01ks 1W11212072 2010073 19 PepaiapF-la pi4apolololnranffingprOgrar1 lwcks.20220073 5/r23t/27

170, SAFS R Nd 11 Ends k

5M2073 53/20t273 17Fj End 60 peal SAFSTOR AdIOwrarn 0 wlce 20210074t 202112074 ._4.. G P d I e i s0 w s 52 3 2 7 / 32 172 00m Pd 1 -31.00 Building Doroýilidon 59 Wks.6/23/2073.7/10/2074 0,13 0 G Pd I Bagin 02wk. 5/23/2073 5023/3073 15 74 299ai Building Dernookoon lEsciproont 2 Wks 5040073 6/07 1..i75"".. . Denrcke/r Low,.ticRl d s; B ud,919 6 idn g 6.......c.......................6/70073.........................71180073.... 6 s..... 6* 2 7

7i 82 7 176 09D,00.11h

.Tubin BUildilng B4 w 6/2073 79112073 1776 N ossh 096 Bui a ding 2... / 0 0 3 9/3..073 1i7-8 bernois cColol end am nii6o Building. 60M1 9/ 1M20073 1 0 21 Q26.0017 .3 17 De*rihGuard-Fclty 3 k, 9113/2073 / 0/312073 166-. 6096/ 1a01 1012502073 _2070074_ 861 0.901.1 cocibin Too.,. and Related Ssrclca 40219 218206074 312712074 182 090091 T-2................... - 2 "l-21r. I1 2060074 I / 0 7 183-- cieinolie Phni soppodlCantun 40219 206074 3070074 ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ .i~ ~*

S 7

166 Aaocand Di"/.efondargrond..Srge. Tanks 3,1 2060f074 31201207 lBS1 bmww De sis~l-.alo1 30, 312602074 4/17074 t* l z t u ~ 'C n i..................... ................................................................ 4" 2 2 8 0 7 3 r 7 0 4 /86 D-.1,ohmting V/bt. Wat., Tnesunent I 02k 3082074 4/30076 18s7* 09/00191 Rcrnainclr Sýco, 15ow6 3f26/374 7/1602074 166 /

0. Pd IE-d

.f02.7/170.07 1_9_4 GrnPd 2 Ende 09011 1002302076 1002302074 ] 2/ 5123 I T iz

DUANE ARNOLD ENERGY CENTER SCENARIO 3 DETAILED SCHEDULE Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 pent t-uel Management Spent Fuel Shipping to DOE Repository in Progress .e...l..... h pping C om pl*e .ry Pd.ibegins DeinpntFelSp~port System Modfification .Design Control Ro1a Ia.m Relo I.a.ca.t.io. .n Destign Speýin-t Fu-el St-or-ag-e-Sec-urty M~odi-fic-at-io-n-s Dry Pjit.d 1 snd D r. y P. d 2 S-p a2 n Spn Fu ueI Coolin g a nd Trans efr t D ry Sto rage. in stall.. .I .S-p* p

e. a int F-ue l -Poola S I y I.stem Modifications Implement~~~

CotrlRomMocations I~mple~mean t S peant Fuel Pool Security Moadifications "......P'urcase Dry St oarge Mod ules for Fuel Assemlies. Spent Fuel Pool Empty Dry.Pd 2.En ds 1...................... n~ ifi~e 'i~ oi i ~ i*;.................... .ry pd 3-Di Storage.Daring Decommissioning .Dry.Pd. 3*.a............................. Dry P d 3 Ed.............................. 1 0 a -0.n I Dry Pdl 4Dr Stira. 1....... $*

i i: si i6 c ~ ; i* i g.............................

.Dry Pd 4 Ends .dryPd5 5p5Dacmmlsoning 1.......................g.. i:* a i ii *.nIs.......................... aration and NRC Rieview ot License Termination Plan Vnfication Survey of Horizontal Storage Modules 1~~~~~~~~~~~~~~~~~~~~ ......*T;,"5;*i]G*G"*i. .reap ar aIio n of F inalI Reapoar t on D ecoam mi ssioan in g a nd N RC Ren vieaw Clan Demolition of ISF51 1 i a 6~~ E;T n dsio Liceinse"T Terminat"io"n ai -i wBi o.......................... Decon Pd 1 - Decommissioning Planning Peiorto Shutdown .Deco. Pd I-a..g .I..n s Pre ap are W riftten Notificatioan a fCas sa t i n atf Oper atIioans 1.................. .pr. a.p.. a.. i re 11. I w rift a. n 1. I.a .I.i.

7 c a I i

a.n... ov. f..r..u. I.....R...m...I.vI.aI.If...r.....m..V......s..s......... .Decommissioning Pilanning and Design Plianning and Deign~r Rt site Characterization Peare Integrated Work Settuence and Schedule for Decommissioning 1................. i:-i;7* i e 7 i* i i~

i;*

c i~ i............................. Prepar Deo ioning Activity Specifica~tions PrpreLce-nse -Ter~mination Plan .e'pare.Detit'ed Work Proce du 'res D-&fr commissioning. Preapaioraion of Dcommis s ioning Liceansea Dac umeants .lnniirg end.Design of Site iepowering. .Admininistrative Actinitieas .Design Containiment Access Modifications. .Pianning and Design of Primary.System.Decontamination .Piainningi or sAbestos Abatement 2__Du atio n.. 1792.4 wks 0wks-35 wtks. 0 wits 35 win. 25 wits 0 wts. 261.2 wks 4 days S........ o.. s.. 48 wks" s........... 36 wits 0 wits f .... s..... 0 wits 6 169.1 wits ...... 3 i s......... 0 wks 2.. 0 wks f i... 30 wis. 27 wks S

03.

wits

t....

0 wits 105 inks 0 wits 0 wits 0 wits 17 wits 16 wits 11 wit 24wits 75 wits 90 wits 42 wits 27 wks/ 10...... wit Sart_ 6123/2033 3/21/2034 2/23/2067 612312033 6/23/2033 7/11/2033 .212/203. 2/21/2034 2/21/2039

76/20W
I*,*

2/21/2039 .2128/20423 21218120423 2/21/2039 5/18/20426 9/18/2042. 7426/2066. 10/23/067/ 2/18/20326 .2/211234 2118/2032" 2/2/2034. 2/18/2032 2/1*/2032 2/18/2032 &/5/2032 4/22/2032 V8/172032. 1219162032. 3/17/2033. Finish 12 1 1415 6 17 18 1 W1 ~11i2f31141511617l1t1912012122142162182 9 1J3LI13 21313435161313 1012312067I I i m i n I III III I I i 2/21/2034 2/21/2037 2/21/2034 3.-1-; .1212034 -7 6 .J2/2. 3 2...... .3.. 4. 1/26/2035 .... 1i26I20* o

2/...17120}39
J~

2/21/2039 5/16/2042 2/21/2039 ... * /2042 7/28/2066 5/18/2042 21023/2067 .... - I, .... I. 0 -Ii.. nmI6 10/9/2067 10/23/2067 2/21/2034 2121812032 2/2/2034 2&i42o32 .61142032 .....i77ii*b; 8/6/2032 5/16/2033 6/13/2033 71.. 2512033 212 /23 2.12 2121 2121 121 2121 2121 2121 9 2/21 'it iC 2/23 miii urns. m 2 8 0/21

DUANE ARNOLD ENERGY CENTER SCENARIO 3 DETAILED SCHEDULE Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 49 50 54 55 56 57 58 59 60 62 63 65 66 67 71 72 75 76 77 78 79 80 61 62-83 65 67 6T9 90 1i22-T ask Name Select Decommissioning General Con .Deco~dl Eds.. D ecen Pd I Ends Decon Pd 2-- Site Modifications and Prel Decon Pd 2begins t Perform Baseline Radiation Surney .Pefo m.Prnry Syste am Daco ntIa mi1na Flush and Drain Non-Essential System .Perfo Hot Spot Removal and Plac inaliz Re sipd Iual s adi Oatin ventory Select Shipping Casks and obtain St.h.ir Design, Specify, and Procure Sp aIai .Modify Containment Access C t.N C n Ro........om s.. ton I II.N.. ................o..m..s.... "...........................T s p e a C u t n a d H n l In E q .. ultngand rad ing Eqru .Procure Non-Engineered Standard Eq 1.. Asbestos Abatement D o......... P d2.. E deco n P d 3 -.Majo r Comnp o ne9nt Rism o va

ne nPd 3 Begins Remove, Paciage and Dispose of Nor Segment, Package and Dispose of Nu Dcon Shield Plugs, Pool Plugs and S Volume Reduce Control Rod Blades a Segment and Dispose of D rywell Head Purchase Dry Storage Modules for GT Finalize Internals and Vessel Segmen Segment, Package and Dispose of Re Drain Dryer Separator Pool and Proce Package and Ship Reactor Pressure Reactor Vessel Insulation Removal an Removal and Disposal of Sacificial Sh

.Rnmve and Dispose of Hazardous W .Decn Pd 3 Ends Decon Pd 4 - Balance of Plant Decontam becon Pd 4 Begins Remove ind Dispose of Spent Fuel S§ Dri Spent Fuel Pool and Process Li .Segment Package and Dispose of ReI Segment, Package and Dispose of Sp Remove, Package and Dispose of Re' Decon Reactor Building n Turbine Building Decon Radwaste Building Decon HPCi and RCIC Building Decon Administration Building Decon Off-Gas Retention Building .._Duration Start L_.Fjinish.r tractor 32 wks 7/1412033 2/21/2034 ater than Class A Waste 20 wks 5/19/2033 10/3/2033 0 wks 2/21/2034 2/21/2034 paratlons 93 wks 2/2112034 12/112038 0 wks 2/21/2034. 2/21/2034 21 wks 2/21/2034 7/15/2034 tion 27 wks i.4/3012034 11/4/2034 tS 2.4 wksh 11/5/2034 11/22/2034 Waste 4.6 wks 11/23/2034 12/23/2034 7 wks. 12/24/2034 2/10/2035 ppingPrmits 8 who 7/16/2034. 9/9/2034 Items and Materials 33 who 2/21/2034.10/f7/2034 aundry, In-Plant Laydown Areas 18 ws 4/29/2035 9/1/2035 9 wKS 9/2/2035 11/3/2035 uipment and Train Operators 4 wo 11/4/2035. 12/1/2035 uipment 0 wksh 12/1/2035 12/1/2035 10 wks. 12/24/2034 i 2/3/2035 0 wksh 12/1/2035 12/1/2035 170 wks 12/11/2035. 3/412039 0 wks 12/1/2035 12/1/2035 r-Essential Systems 82 wkh 12/2/2035 6/28/2037 clear Steam Supply System 43w wh 6/28/2037 4/24 tad Tensioners 2 wsh 121/22035 12/15/2035 nd Foet Channels and LPRMS.. 14 vws 12/16/2035 3/23/2036 8.2 whos 12/16/2035: 2/10/2036 CC Waste 0 who 2/10/2036 2/10/2036 ting Details 5 wks 2/13/2036 3/17/2036 ator Intemnals 35 wks 3/20/2036 11/17/2036 ss Liquid Waste 3 wks o 11/20/2036 12/8/2036 Vessel 29 whso 4/25/2038 11/13/2038 d Disposal 2 wks. 10/31/2038: 11/13/2038 hield Well 16 wks 11/14/20386 3/4/2039 aste 2 wks 2/20/2039 3/4/2039 0 who 3/4/2039 3 //203"9 nination 96.3 wks 3/42039i 1/7/2041 0who 3/4/2039 3/4/2039 3orage Racks 4 wo 3/5/2039 4/1/2039 uid Waste 8 wks 4/2/2039 i 5/27/2039 fueling Bridge 2 wks 5/28/2039 6/10/2039 ent Fuel Pool Island Equipment w i 6/11/2039 1 7/15/2039 maining Active Plant Systems 15 wks i 7/16/2039 10/2/2039 28.5 wka. 10/29/2039 1172'ii-i 21.5 wks 3/5/2039; 813/2039 11 7 iks I 3/5/2039 5126/2039 2 wks 5/19/2039. 6/22039 1 wk 6/2/2039 6/9/2039 2 whSo 6/9/2039 6/23/2039 -.. Lu, 8=9 I10fl121j 13 114TL5 116 17l18 11920 211 = I23jj2Ji j Mtj1 4293 131J732 1343 134 IiI3j. pi =......

DUANE ARNOLD ENERGY CENTER SCENARIO 3 DETAILED SCHEDULE Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 ID 124 127 -iff -12 30 131 133 1_ý34 1-i35 137 1-i38 _1_42 143 144ý 145 146 1i49 150 151 13 157 Task Name Deoon LLRW Storage and Processing Building Decon Off-Gas Slack De~cn and Remove Yard Structures and Tanks. Segment, Package and Dispose of Contaminated Decon Eqoipment and Tooling Remove Undergmound Storm Drains and Manholes Fial Status Survey for Structures .Final Status Survey for Land Areas Preare Final Report of Dismantling Program becon Pd 4Ends Gm Pd-c lean Building Demolition Gm Pd 1 Begins .Clean Building Demolition Equipment Install Temnporary Ofirice Buildings Demolish LowTLevel Radwaste Building briiti urbine Buildintg................... Demolish Data Acquisition and Technical Support Building Demolish Control and Administrative Buildings .. 11-1 D e mn.o lis h G. a rd. F a.c. ity. .Demoijs. HPCI and.RlCIC uilding............... Demolish Reactor Building Demolish Cooling Towers and Related Structures DJ_.urationq Str i t!Lh -11 L2 L.AJ5i.!.jLJ..i9 4 Wks 4wks .0 ws 318 days 310 days 13 wks 59 wks O6Wks .2... 6 wko 14 wks, 6.wks* 38wksi 2 wks .4whs 3wks 3 w.sk 6i2312039 7/23/2039 7/21/2039 : 7/31/2039 11/812041 1/7/20411 1/71204t 1/712041

~, i..

1/712041 1/21/2041 1/21/2041 4/29/2041 4/29/2041 4/29/2041 .0.14/2041. 10/14/2041 10/14/2041 11.11/2041i 712 112039 7/21/2039 .01812040 10/8/2040 117/2041 2/2412042 1/7/2041 1/21/2041 4/2912041 5/13/2041 611012041 10/281204. 5113/2041 11111/2041 I 11/4/2041 Iii 4i~01/ 2/24 .518 914 15 18217i1811920211222324252827128291 323334 3536J373k Demolish Training Center Demolish Plant Support Center Remove and Dispose of Underground Storage T eoish Of-Gaa.Stack i Ii........... i

i........

.Deminous ExistIi n.g I.W.a..s te.W.a.te. r T..reIa-a .t,me. .n.t Demolish Remaining Structures .GmPd 1.Ends................. Gm Pd 2 - Site Restoratian .Gmd eins...... Gm Pd 2 Begins Site Restoration Equipment Remove Temporary Structures Finish Grading and Re-Vegetate Site Gm Pd 2 Ends....................... Tanks 1 wk. 11/11/2041 11.18/2241 15 wks 11/11/2041 2/24/2042 0 wks 2/24/2042 2/24/2042 inks 2124/2042 5/18/2042 0who 2/24/2042 i 2/24/2042 wh 2/2 l4/2042 _3_/9/_204_2 ..........................2....... , 4 o 2 2 wks 3/9/2042 312312042 8 whs 3/23/2042 5/18/2042 wksh 5/18/2042 5/18/3042

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

d I

I Spent Fuel Manage.ent 2 Spnwolhpogt.O ooetry in Pmregoss ý3 Speint Fool Shipping Comrplete 4 Sty Pd I. P,.1 Pool Iesland Deelgn. S Dr Pdl 80Bgm... S iw eg n S P nnt F uel S uPp o t Syotrenm Mod iftnbo n a "I

n.

C.. Roo. Rel. n.ton...... 8 -1 Dedgn spent Fool Storaeg Sononty Modilfioanon 9 DryPd Ends I0 Sty Pd 2.- Spent Fuel Cooling and Transfer to Sry Storage I.................... Dry.P. 13 ImlrnpaentConya/ Roo Modificaaons 16 Spent Fuel P So i Empty trp e n i.... 17I Dry Pdi2 End. i i i ; i l.......... D Sty Pd 3 -:D.Stsor Sage oi Don c y ts Dry Pd 3 Bogi 20 1 Dry Pdi3 Ends 21S0 Pd 4. SPtii Deaonnnliorlontn 22 Dr d4 sogire.. 23 Pepraa and NRC ero at; pioe rnaon Pa 24 I V eor/rln Sorneyi o iatlor/nanta Storage modiýe/e. Pr.r.. n a Fia R. flng and N C Ft. w 26 Cle n Db n Ir o ISr I

I 27 Dry P4 Edc 28Licnstte Termnati~on 30 SAPSTOrR Pd - SAFST6R Plan'ng P"t tot a'Stttoi..

3511 SASTOR Pd I Somie 3-2 Prepare/Pd/.. en .t C. f 0 e............... 33 l Prepare Written NoiaS~n2nof FueI Re rofa tram Veesal 34 SASTRPrrin. 35 Phnnhrg tar SAFOTOR Seeelirre ~ibr onp 36 Prepoure SAFSTOR Plan. 37 ...... ' ara 0t SA FO TO L ic*sen or a...

* * '* *X i*'*Y*5,*

I.................................... 38S Prepare SAFSTOR 1ntogratd V41rlSn/dole 34 Prepare SAFSTOR Aao/ty Spedllaasan. a 1- .1.,.1............ pIap -= I.* IST 1 ~**~ 40 Admnsrartivo~ ActmnraC it Prepar.taion tor SAFSTO9. 417 Prepare Detailed SAFSTOR Work Pron*du.re. 42 Phnning for Asbi*stos Abatement Soloat SAFSTOR General Corrarta 44. Planning an Deeign of Pninrrry Sy-*n* D... i 45 i SAFSTOR Pd 1 End. 46ý SAPSTOR Pd 2 -SAPSTOR Priparatiol0 Followring 511tdona 47 SAPSTIkOR P4 Begin. ............ F S b ' d e 48 Praoe Naon-Engigrred Sbmrd*Equoipment For SAFSTOR Preparations 49 Perftra Prinry yeten Dorantnrminaon and Place Wa*. in Intm S*gr....... 50 Fluesh. Drair -nd Deý-Ereri No-Eeaonao SyCton -n S--a &Ite tI Drain and Process S Pppeei ooi i 'ater nd Hydroee Torun. Weh 52ýý i Droaned Prýaeec Dryer Storage P.a Wae en.tr...Dye treePn 53 Genio C .an.y............... 04-I Abea Abate.ent 551 ! Remn.e and .i.p..o ot Hczarda.e Waste .Pr.ATOR k~ontt -- P-j* Pd';*:", 21: E"nds............................................ 59*"'........... IndYO Pý 6g n -..................... 57 SAFSTOR P2 end 60 i SAFSTOR P,13 Ends 8AI= 3.*R p* i;

p~lj

..*i* .pri r

g SA#STR Pd4.npltalO*.

AFSTOR N.p-..P t.n. 82 S AF STOR Pd 4 Bgire

- .*.._ i "'In*....L 1792.23 V 2I2233M

............. 5 3,i

00410t 212412037

... 35 012312033 I - - -- 3 3205 7114/2033 3054k. 6/2302033. 250410 91W2033 2 34 261 10. 2/21/2034i /2 34 44 2 012M034 T............ T 0 Dos 2/210039 1431... .2. n 2121/2039 "ws M112039 0 6e 212/21039 Si osa 7/20/2088 0 no/n 70/0086 30Dwk. 70112066 6 wk. 2A/24067 27,05. 4S18007 004,0 21M2103 Dos wk. t8032 Dose& 2118/2D32 17 os /052 22 ose /t6032 2 4 k. 2/1602032 12,01 311860032 8 iose 6/102032 39 oý 8502032 1004AM 51502033 32,1 7/140033 2 8 3 2704wk. 523 41 "k. 2/21/2024 s 2121/2*14 20410 21212034T 5 w " /1 034 i not, 5/150034 21 21 00 316119/20034 216w0. 47/1702034 .0 1000034 5 vv"/ 0 M120034 I T 20 wk 12/2132034 20 wise 12100034

0. l *.

512039103 -.43.11. . k 6 2 1a/2203, 2010391 Finiok 1F5l 67 8 9 0 11 12 13 141 61 81 67i T0 l o i n 212./210 .... 1,0340

23172033 2121/2034

-j3 20t0 r034 2/21 /2034 2/21f2034 2/1802035 2/21/2039 720.12039 2/2 2039 7/920066 1012312007 4r29/2067 100312067 10/902067 10/231267 ai i i i 121 X 2 i121 U!4 2/21 112123 L L

I I~I I urn.

212112904 .1612'032 2/1 8/2032 211802032 7/I1d/2032 6/2100r232 7/159032 21150032 6/20/32 .1 720033 21202034 121/720M / 214/203 7/23/2034 20102034 5/14/2034 4730034 431=034 71210034 123/122034 .120. 3/ 41201 r034 1171/63113 12/312W9 012

DUANE ARNOLD ENERGY CENTER SCENARIO 4 DETAILED SCHEDULE SAFSTOR, License Extension, Yucca Mountain Opening 2025 ID TeckNenre................09 50 tA~~~~~~ ~ ~ ~ ~ I 3t63p4 51617t t 19111113j4451jl1lj9t42J 9

43.

S.69,10 ~ ~ ~ Oi2 63 Vourr Reduce Cori Rod. Fue Channe/s & LPRMm " " "14 i 212109. 2 M 641 Disk, Sýpnt Fuel Pool and Proocai bgiud Was/a 65 bran and D-En..rgio.6Remaining Systemnra nd Secure Site 290 .04k 3 66u Renoval and Inla-r Storoge of Spent Resinse. Filter Media and Tank Sludge 2 ".1/ 8/1/2039 R S.nent Pokg and DiPoas-of S...peni.. Ful Pool au. Equip ent 5 812120139 6-R 0.-is re f/. fo COounrrcy 12 91i~25b09 -9 SAFSTOR Pd 4 Ends 0 was 12/17/2039 70T SAFSTOR Pd 5 - Sonmncny Dodegj Drifitorale 1453.2 wki/ 1 V1712039 7-1 SFSTOk pci 6;eg-.. 0 1/712U9

.......*;FS* R ;*
* *.£;*
i* ' ;*s*;* ;...............

7- - AFTOR Pi6. Dormncy only 7.......... 970 k. 11326 75 SAFSTOR Pd 6 Begin= 0 wt 10/23/20R7 77 SAFSTOR Pd 6 End. 0 wk. 61/21RR86 79 SAFSTOR Pd7 Begins 6/1/2..96......... oi, am 90 0ornnmoinuooingPlanningand0Design 5W ~ R/2R -F1-Planning and Design of Sile Ch/aractriati.on 1 fwk..... 6if20/389. 62 Pnpara*,intgre AorSac-d I. i...g1.....................15. 0/5206. 64-Prepare L/cense ten/nimnason Plan 2401/..am 6-5 Prepare 0.10,/nda Mdnk o-cdue Io eomoining "75w-k.01/ 9g/14'/2069S 66 Prepanabon of 0.oonnn/anonng Licenm Documern.ts 90 wks 61112090 87 Planning and.. Dig,* of' Si

e /.powmig 35 wk.

6/.O.i. 698 Adm/nisadive A~toies )8 69 Diragn Containmnent Accaents odifictions 1300 112/26 90 el./rt Decommissaioning 72.0.1.1 Contractor 321 w1 7/1/72067 91 ORFSTORPO7Ends. 0.01/ 2/19/2099.nfla 92 sAF irtoR P a9. li'nr n 6' i t/e. M O.90.. and P..pr "'"a "n' viei' ~~~.... s, i,ii

; ' i i If n "i
i T h

( [...... 93 SASORP6 ein.O0 1k. 2Jl/192069 94 Revo/akelnlr. nabreit re and Rejporear*6 Oi 0o1o 7272 95

Partom, Po~-SAFST72R Raiieina RadiationkSm~oy w01 19720/206 96 F/na.. 9.'di' l Radiation lr noen.y 7...6...............9....

97 Select Siypping Coakeei nd (5e~ S6op~pirr Perm.i6tsn 172/26 98 Design, Sp.cify, rd Procur, Special1Iters n.d0 MatHlsnl. 33,i/. 10720/206 -- * ~ ~ ~ ~ 06 Modly; containment. .36 1,1 27262069 106 otu him Cang R,,, Hot undry, In-plint Laydo/ Areas s 6//208 10/ Test SipeoiaI Cuwbrrg mrr Harrdlrg Equipmnt rlwrd Trairr 7petatora 4;w//0.10730/2086 -6........... .2w 109 SAFSTOF6 PillMajo E olnnds 0 nl711n2e8 105 SAFSTOR Pdll 9g-Majno 104.2..k. 7.1S/20119 _7509 SAFSOR Pt 9 Bgin. wk. 7152089. -q

i.........................................................................

o ~ T... 107 Segnrent Peckeg. and 06/poe. o Nuclear Steam Supply ystenm 4~/ /S2 1 e08 on Shield Ph..," Pool Plugs end Stud Tenesions 2""" 7/1 672089 10 eon..Dco.Package and ShilpControl Rod Dr/n... 110 Segment and Dup; f6 i ~ 2 ka 77262069 Ill Purchase Dry Storag. Modules fon GTCC W l 0 Wimk 7/1520899 "3 i - !.... .... R el ; ; i" a b; ...... i 112

9.

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Decommissioning Cost Estimate Study for the Duane Arnold Energy Center Document No. 82A9634 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 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Fuel Pool Systems Repository Opening Date: Existing Modified 1/1/2025 Unit I Shut Down Date 2/2 1/20 14 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 Decommissioning Alternative Decon Spent Fuel Alternative Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total Undistributed Decon Pd 1 Subtotal Subtotal $9,488 $19,524 so $79 so $0 $0 $476 $1,246 $2,622 $10,734 $22,704 Page 2 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 1 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Fuel Pool Systems Repository Opening Date: Existing Modified 1/1/2025 Unit 1 Shut Down Date 212112014 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 1.02 Utility Staff HP Supplies 1.03 Security Guard Force 1.04 Insurance 1.05 Property Taxes 1.06 NRC Decommissioning Fees 1.07 Materials and Services 1.08 DAW Disposal $29,818 $0 $2,281 $0 $0 $0 $0 $0 $0 $1,028 $0 $0 $o $0 $9,205 $0 $0 $0 $0 $0 $0 $0 $0 $45 $0 $0 $0 $1,093 $18 $679 $0 $0 $3,876 $154 $342 $164 $3 $102 $1,381 $7 $33,695 $1,182 $2,623 $1,257 $20 $780 $10,586 $52 Page 3 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 1 Decommissioning Alternative Decon Spent Fuel Alternative Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 Decommissioning Alternative Decon Spent Fuel Alternative Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 1.02 Utility Staff HP Supplies 1.03 Security Guard Force 1.04 Insurance 1.05 Property Taxes 1.06 NRC Decommissioning Fees 1.07 Materials and Services 1.08 DAW Disposal 1.09 Energy 1.10 Decommissioning General Contractor Staff $47,010 $0 $4,186 $0 $0 $0 $0 $0 $0 $46,118 $0 $1,784 $0 $0 $0 $0 $14,145 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $213 $0 $0 $0 $0 $0 $2,006 $33 $2,051 $0 $0 $1,953 $0 $6,111 $268 $628 $301 $5 $308 $2,122 $32 $293 $5,995 $53,121 $2,052 $4,813 $2,306 $37 $2,359 $16,267 $244 $2,246 $52,113 Page 5 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 1 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 Decon Pd 3 Subtotal Subtotal $97,314 $116,619 $18,399 $25,630 $213 $47,567 $6,043 $6,174 $16,433 $35,264 $138,398 $231,249 Page 6 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 1 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit I Shut Down Date 2/21/2014 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 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date-11121325 Unit 1 Shut Down Date 2/21/2014 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 Decon Pd 4 Subtotal Subtotal $41,332 $54,704 $8,795 $14,691 $160 $11,755 $3,289 $4,210 $7,257 $14,495 $60,834 $99,858 Page 8 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 1 Decommissioning Alternative Decon Spent Fuel Alternative Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Fuel Pool Systems Repository Opening Date: Existing Modified 1/1/2025 Unit 1 Shut Down Date 2/2 1/20 14 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 $45,954 $53,926 $0 $13,050 $16,792 $129,721 Subtotal Page 11I of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number I Decommissioning Alternative Decon Spent Fuel Alternative Dry License Status Existing Fuel Pool Systems Modified -Repository Opening Date: 1/1/2025 Unit I Shut Down Date 2/21/2014 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 Dry Pd 3 Subtotal Subtotal $13,304 $13,304 $4,757 $4,757 $0 $0 $4,806 $4,806 $3,267 $3,267 $26,136 $26,136 Page 12 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca MQuniain Opening 2025, Interim Waste Storage Scenario Number 1 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Fuel Pool Systems Repository Opening Date: Existing Modified 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 $55,181 $19,730 so $24,673 $14,262 $113,846 Subtotal Page 13 of 82

Table 1 Duane Arnold Prompt Dismantlement, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number I Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Fuel Pool Systems Repository Opening Date: Existing Modified 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 Decommissioning Alternative Decon Spent Fuel Alternative Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/2 1/20 14 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 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 2008 Dollars in Thousands No Item Description Labor Equipment Disposal Other Contingency Total 3.05 Insurance $0 $0 $0 $141 $21 $163 Undistributed Grn Pd 1 Subtotal Subtotal $10,684 $22,379 $0 $8,610 $0 $1,543 $385 $385 $1,459 $5,160 $12,529 $38,078 Page 16 of 82

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

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 Decommissioning Alternative Safestor Spent Fuel Alternative Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 Decommissioning Alternative Safestor Spent Fuel Alternative Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 Decommissioning Alternative Safestor Spent Fuel Alternative Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit I Shut Down Date 2/21/2014 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 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Fuel Pool Systems Repository Opening Date: Existing Modified 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 SAFSTOR Pd 5 Subtotal Subtotal $1,490 $1,575 $570 $941 $1 $9,020 $5,271 $5,271 $1,081 $3,260 $8,413 $20,068 Page 24 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 Decommissioning Alternative Safestor Spent Fuel Alternative Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 $8,399 Subtotal $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 Decommissioning Alternative Safestor Spent Fuel Alternative Dry License Status Fuel Pool Systems Repository Opening Date: Existing Modified 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 SAFSTOR Pd 7 Subtotal Subtotal $9,196 $9,455 $3,114 $3,203 $0 $38 $11,931 $11,931 $3,583 $3,641 $27,825 $28,269 Page 26 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 1.02 Utility Staff HP Supplies 1.03 Security Guard Force 1.04 Insurance 1.05 Property Taxes 1.06 NRC Decommissioning F 1.07 Materials and Services 1.09 Energy 1.10 Decommissioning Gener 1.11 DGC HP Supplies 1.12 SAFSTOR Surveillence a

ees al Contractor Staff and Maintenance

$3,962 $0 $553 $0 $0 $0 $0 $0 $4,211 $0 $0 $0 $136 $0 $0 $0 $0 $1,241 $0 $0 $200 $0 $0 $0 $0 $0 $0 $o $0 $0 $0 $0 $0 $0 $0 $0 $1,059 $17 $360 $0 $63 $0 $0 $387 $515 $20 $83 $159 $3 $54 $186 $9 $547 $30 $58 $4,477 $157 $636 $1,218 $20 $414 $1,427 $73 $4,758 $230 $445 Page 27 of 82

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

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 Decommissioning Alternative Safestor Spent Fuel Alternative Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Fuel Pool Systems Repository Opening Date: Existing Modified 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 1.02 Utility Staff HP Supplies 1.03 Security Guard Force 1.04 Insurance 1.05 Property Taxes 1.06 NRC Decommissioning Fees 1.07 Materials and Services 1.08 DAW Disposal 1.09 Energy $28,783 $0 $2,563 $0 $0 $0 $0 $0 $0 $0 $1,093 $0 $0 $0 $0 $8,661 $0 $0 $0 $0 $0 $0 $0 $0 $0 $246 $0 $o $0 $0 $1,228 $20 $1,256 $0 $0 $1,248 $3,742 $164 $384 $184 $3 $188 $1,299 $37 $187 $32,525 $1,256 $2,947 $1,412 $23 $1,444 $9,960 $282 $1,436 Page 31 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 SAFSTOR Pd 1 Subtotal Subtotal $59,583 $81,398 $11,266 $18,282 $246 $56,872 $3,752 $3,752 $10,086 $31,617 $84,932 $191,919 Page 32 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Fuel Pool Systems Repository Opening Date: Existing Modified 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 1.02 Utility Staff HP Supplies 1.03 Security Guard Force 1.04 1.05 1.06 1.07 1.08 1.09 1.10 Insurance Property Taxes NRC Decommissioning Fees Materials and Services DAW Disposal Energy Decommissioning General Contractor Staff $19,045 $0 $2,197 $0 $o $0 $0 $0 $0 $16,969 $o $1,260 $0 $0 $0 $0 $6,149 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $115 $0 $0 $0 $0 $0 $1,053 $17 $1,076 $0 $0 $948 $0 $2,476 $189 $330 $158 $3 $161 $922 $17 $142 $2,206 $21,520 $1,449 $2,526 $1,210 $20 $1,238 $7,072 $132 $1,090 $19,174 Page 33 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 Decommissioning Alternative Safestor Spent Fuel Alternative Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 Dry Pd 2 Subtotal Subtotal $44,379 $45,954 $13,922 $53,926 $0 $0 $13,050 $13,050 $10,663 $16,792 $82,013 $129,721 Page 36 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Fuel Pool Systems Repository Opening Date: Existing Modified 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 Decommissioning Alternative Safestor Spent Fuel Alternative Dry License Status Existing Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2014 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 Dry Pd 4 Subtotal Subtotal $1,694 $3,077 $378 $1,067 $0 $1,875 $5 $166. $298 $898 $2,374 $7,082 Page 38 of 82

Table 2 Duane Arnold SAFSTOR, Existing License, Yucca Mountain Opening 2025, Interim Waste Storage Scenario Number 2 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Fuel Pool Systems Repository Opening Date: Existing Modified 1/1/2025 Unit I Shut Down Date 2/21/2014 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 3.02 Security Guard Force 3.03 Decommissioning General Contractor Staff 3.04 Energy 3.05 Insurance $3,765 $606 $6,313 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $392 $141 $489 $91 $821 $59 $21 $4,255 $697 $7,133 $451 $163 Page 39 of 82

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

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

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 Decommissioning Alternative Decon Spent Fuel Alternative Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 Decommissioning Alternative Decon Spent Fuel Alternative Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 1.02 Utility Staff H{P Supplies 1.03 Security Guard Force 1.04 Insurance 1.05 Property Taxes 1.06 NRC Decommissioning Fees 1.07 Materials and Services 1.08 DAW Disposal 1.09 Energy $29,818 $0 $2,281 $0 $0 $0 $0 $0 $0 $0 $1,028 $0 s0 $0 $0 $9,205 $0 $0 $0 $0 $0 $0 $0 $0 $0 $45 $0 $0 $0 $0 $1,093 $18 $679 $0 $0 $885 $3,876 $154 $342 $164 $3 $102 $1,381 $7 $133 $33,695 $1,182 $2,623 $1,257 $20 $780 $10,586 $52' $1,018 Page 45 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 Decommissioning Alternative Decon Spent Fuel Alternative Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 Decon Pd 2 Subtotal Subtotal $50,743 $55,103 $11,111 $25,174 $45 $2,625 $2,675 $2,675 $8,718 $11,970 $73,290 $97,547 Page 46 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 Decommissioning Alternative Decon Spent Fuel Alternative Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit I Shut Down Date 2/21/2034 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 1.02 Utility Staff HP Supplies 1.03 Security Guard Force 1.04 Insurance 1.05 Property Taxes 1.06 NRC Decommissioning Fees 1.07 Materials and Services 1.08 DAW Disposal 1.09 Energy 1.10 Decommissioning General Contractor Staff $47,010 $0 $4,186 $0 $0 $0 $0 $0 $0 $46,118 $0 $1,784 $0 $0 $0 $0 $14,145 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $209 $0 $0 $0 $0 $0 $2,006 $33 $2,051 $0 $0 $1,953 $0 $6,111 $268 $628 $301 $5 $308 $2,122 $31 $293 $5,995 $53,121 $2,052 $4,813 $2,306 $37 $2,359 $16,267 $240 $2,246 $52,113 Page 47 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit I Shut Down Date 2/2112034 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 Decon Pd 3 Subtotal Subtotal $97,314 $116,409 $18,399 $25,503 $209 $72,426 $6,043 $6,174 $16,432 $41,316 $138,394 $261,821 Page 48 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 Decon Pd 4 Subtotal Subtotal $41,332 $54,704 $8,795 $14,691 $160 $13,740 $2,832 $3,753 $7,188 $14,882 $60,308 $101,773 Page 50 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 Subto Dry Pd 1 Subto tal tal $93 $1,096 $0 $15 $0 $0 $0 $0 $12 $144 $105 $1,256 Page 51 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Fuel Pool Systems Repository Opening Date: Extension Modified 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Fuel Pool Systems Repository Opening Date: Extension Modified 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 Decommissioning Alternative Decon Spent Fuel Alternative Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit I Shut Down Date 2/21/2034 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 Dry Pd 5 Subtotal Subtotal $1,698 $2,941 $379 $1,013 $0 $1,514 $172 $333 $323 $846 $2,571 $6,646 Page 55 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit I Shut Down Date 2/21/2034 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 3.02 Security Guard Force 3.03 Decommissioning General Contractor Staff 3.04 Energy $3,765 $606 $6,313 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $244 $489 $91 $821 $37 $4,255 $697 $7,133 $281 Page 56 of 82

Table 3 Duane Arnold Prompt Dismantlement, License Extension, Yucca Mountain Opening 2025 Scenario Number 3 Decommissioning Alternative Spent Fuel Alternative Decon Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 $22,379 $8,610 $1,543 $385 $5,160 $38,078 Subtotal 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 Grn Pd 2 Subtotal Subtotal $1,492 $1,879 $0 $384 $0 $0 $30 $30 $200 $338 $1,722 $2,632 Page 58 of 82

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

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 Decommissioning Alternative Safestor Spent Fuel Alternative Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 SAFSTOR Pd 1 Subtotal Subtotal $9,488 $16,136 $0 $67 $0 $0 $0 $0 $1,246 $2,119 $10,734 $18,324 Page 60 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 Decommissioning Alternative Safestor Spent Fuel Alternative Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit I Shut Down Date 2/21/2034 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 SAFSTOR Pd 3 Subtotal Subtotal $1,189 $1,189 $455 $455 $0 $0 $4,938 $4,938 $972 $972 $7,554 $7,554 Page 63 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 Decommissioning Alternative Safestor Spent Fuel Alternative Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Fuel Pool.Systems Repository Opening Date: Extension Modified 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Fuel Pool Systems Repository Opening Date: Extension Modified 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 1.02 Utility Staff HP Supplies 1.03 Security Guard Force 1.04 Insurance 1.05 Property Taxes 1.06 NRC Decommissioning Fees 1.07 Materials and Services 1.09 Energy 1.10 Decommissioning General Contractor Staff 1.11 DGC 1HP Supplies 1.12 SAFSTOR Surveillence and Maintenance $3,962 $0 $553 $0 $0 $0 $0 $0 $4,211 $0 $0 $0 $136 $0 $0 $0 $0 $1,241 $0 $0 $200 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $o $1,059 $17 $658 $0 $63 $0 $0 $387 $515 $20 $83 $159 $3 $99 $186 $9 $547 $30 $58 $4,477 $157 $636 $1,218 $20 $756 $1,427 $73 $4,758 $230 $445 Page 67 of 82

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

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Fuel Pool Systems Repository Opening Date: Extension Modified 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 1.02 Utility Staff HP Supplies 1.03 Security Guard Force 1.04 Insurance 1.05 Property Taxes 1.06 NRC Decommissioning Fees 1.07 Materials and Services 1.08 DAW Disposal 1.09 Energy $28,783 $0 $2,563 $0 $0 $0 $0 $0 $0 $0 $1,093 $0 $0 $0 $0 $8,661 $0 $0 $0 $0 $0 $0 $0 $0 $0 $246 $0 $0 $0 $0 $1,228 $20 $1,256 $0 $0 $1,104 $3,742 $164 $384 $184 $3 $188 $1,299 $37 $166 $32,525 $1,256 $2,947 $1,412 $23 $1,444 $9,960 $282 $1,270 Page 71 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Fuel Pool Systems Repository Opening Date: Extension Modified 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 SAFSTOR Pd 9 Subtotal Subtotal $59,583 $81,398 $11,266 $18,282 $246 $56,872 $3,608 $3,608 $10,065 $31,596 $84,766 $191,753 Page 72 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 Decommissioning Alternative Safestor Spent Fuel Alternative Dry License Status Fuel Pool Systems Repository Opening Date: Extension Modified 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 1.02 Utility Staff HP Supplies 1.03 Security Guard Force 1.04 Insurance 1.05 Property Taxes 1.06 NRC Decommissioning Fees 1.07 Materials and Services 1.08 DAW Disposal 1.09 Energy 1.10 Decommissioning General Contractor Staff $19,045 $0 $2,197 $0 $0 $0 $0 $0 $0 $16,969 $0 $1,260 $0 $0 $0 $0 $6,149 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $115 $o $0 $0 $0 $0 $1,053 $17 $654 $0 $0 $816 $0 $2,476 $189 $330 $158 $3 $98 $922 $17 $122 $2,206 $21,520 $1,449 $2,526 $1,210 $20 $752 $7,072 $132 $939 $19,174 Page 73 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 SAFSTOR Pd 1 Subtotal Subtotal $38,211 $48,169 $8,130 $12,686 $115 $5,794 $2,540 $3,461 $6,629 $10,679 $55,623 $80,785. Page 74 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Fuel Pool Systems Repository Opening Date: Extension Modified 1/1/2025 Unit 1 Shut Down Date 2/21/2034 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 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit I Shut Down Date 2/21/2034 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 Dry Pd 2 Subtotal Subtotal $44,379 $45,954 $13,922 $40,776 $0 $0 $13,050 $13,050 $10,663 $14,820 $82,013 $114,599 Page 76 of 82

Table 4 Duane Arnold SAFSTOR, License Extension, Yucca Mountain Opening 2025 Scenario Number 4 Decommissioning Alternative Spent Fuel Alternative Safestor Dry License Status Extension Fuel Pool Systems Modified Repository Opening Date: 1/1/2025 Unit I Shut Down Date 2/21/2034 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 Dry Pd 3 Subtotal Subtotal $54,570 $54,570 $19,512 $19,512 $0 $0 $20,697 $20,697 $13,549 $13,549 $108,328 $108,328 Page 77 of 82

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

Decommissioning Cost Estimate Study for the Duane Arnold Energy Center Document No. 82A9634 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 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 $9,800 $11,275 $48,280 $55,907 $70,994 $70,994 $70,994 $56,954 $54,002 $1,166 $8,163 $13,138 $13,138 $10,895 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $1,256 $22,266 $25,928 $25,928 $25,928 $25,928 $7,094 $3,909 $3,909 $3,909 $3,909 $3,909 $3,949 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,880 $4.739 $0 $0 $0 $0 $0 $0 $0 $0 $0 $32,937 $7,773 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $9,800 $12,531 $70,546 $81,835 $96,922 $96,922 $96,922 $64,048 $57,910 $38,011 $19,845 $17,046 $17,046 $14,844 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,880 $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 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 $7,908 $9,100 $42,672 $1,789 $1,789 $1,789 $1,789 $13,308 $3,794 $3,794 $3,794 $3,794 $3,794 $2,036 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $2,184 $2,303 $2,303 $2,303 $2,303 $2,303 $2,303 $2,303 $2,303 $0 $1,256 $22,237 $25,934 $25,934 $25,934 $25,934 $7,136 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $4,724 $4,616 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $7,908 $10,356 $64,909 $27,722 $27,722 $27,722 $27,722 $20,444 $7,742 $7,742 $7,742 $7,742 $7,742 $5,985 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $5,397 $6,172 $6,800 $2,303 $2,303 $2,303 $2,303 $2,303 $2,303 $2,303 $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 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 $2,303 $2,303 $2,303 $9,354 $14,366 $63,862 $79,225 $96,091 $80,953 $47,681 $18,654 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $20,535 $20.763 $2,303 $2,303 $2,303 $9,354 $14,366 $63,862 $79,225 $96,091 $80,953 $47,681 $39,189 $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 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 $9,332 $10,729 $48,632 $57,080 $80,380 $80,380 $80,380 $59,555 $55,119 $1,160 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $1,256 $19,662 $22,910 $22,910 $22,910 $22,910 $6,645 $3,906 $3,906 $4,036 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,648 $4-352 $0 $0 $0 $0 $0 $0 $0 $0 $0 $32,955 $7,755 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 s0 $9,332 $11,985 $68,294 $79,990 $103,290 $103,290 $103,290 $66,201 $59,025 $38,021 $11,791 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,648 $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 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 $7,913 $9,100 $44,343 $1,790 $1,790 $1,790 $1,790 $20,514 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $ 1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,728 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $0 $1,256 $19,657 $22,910 $22,910 $22,910 $22,910 $6,688 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $4,492 $4,234 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $7,913 $10,356 $64,000 $24,700 $24,700 $24,700 $24,700 $27,202 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $5,541 $6,084 $5,961 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $2,291 $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 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 $2,291 $2,291 $2,291 $9,459 $14,542 $66,857 $84,866 $96,008 $73,393 $47,308 $11,373 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $25,401 $15,568 $2,291 $2,291 $2,291 $9,459 $14,542 $66,857 $84,866 $96,008 $73,393 $47,308 $36,774 $15,568 Total $578,794 $230,632 $40,969 $850,395 Page 6 of 6

Decommissioning Cost Estimate Study for the Duane Arnold Energy Center Document No. 82A9634 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 1 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 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 $1,096 $7,888 $9,185 $9,185 $9,185 $9,185 $3,032 $1,990 $1,990 $1,990 $1,990 $1,990 $1,993 $1,989 $1,98.9 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $15 $9,256 $10,778 $10,778 $10,778 $10,778 $2,166 $711 $711 $711 $711 $711 $713 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $2,240 $2,608 $2,608 $2,608 $2,608 $993 $719 $719 $719 $719 $719 $749 $889 $889 $889 $889 $889 $889 $889 $889 $889 $889 $889 $889 $889 $1,112 $19,384 $22,572 $22,572 $22,572 $22,572 $6,191 $3,420 $3,420 $3,420 $3,420 $3,420 $3,455 $3,589 $3,589 $3,589 $3,589 $3,589 $3,589 $3,589 $3,589 $3,589 $3,589 $3,589 $3,589 $3,589. $144 $2,882 $3,356 $3,356 $3,356 $903 $489 $489 $489 $489 $489 $494 $514 $514 $514 $514 $514 $514 $514 $514 $514 $514 $514 $514 $514 $1,256 $22,266 $25,928 $25,928 $25,928 $25,928 $7,094 $3,909 $3,909 $3,909 $3,909 $3,909 $3,949 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $4,103 $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

Year Cost Account C. Greenfield 2021 2022 Account Total Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Labor Mat. & Equip. Waste Other Subtotal $19,357 $7,447 $1,335 $333 $28,474 $4,901 $1,547 $208 $82 $6,738 $24,258 $8,994 $1,543 $415 $35,212 Contingency $4,463 $1,035 $5,498 Total $32,937 $7,773 $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 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 $6,963 $8,013 $25,720 $282 $282 $282 $282 $3,352 $298 $298 $298 $298 $298 $293 $291 $291 $291 $291 $291 $291 $291 $29 $33 $9,662 $108 $108 $108 $108 $1,376 $178 $178 $178 $178 $178 $128 $111 $111 $111 $111 $111 $111 $111 $0 $0 $495 $0 $0 $0 $0 $3,646 $1,705 $1,705 $1,705 $ý1,705 $1,705 $427 $1 $1 $1 $1 $1 $1 $1 $0 $0 $1,399 $1,169 $1,169 $1,169 $1,169 $2,941 $996 $996 $996 $996 $996 $895 $859 $859 $859 $859 $859 $859 $859 $6,993 $8,047 $37,276 $1,558 $1,558 $1,558 $1,558 $11,316 $3,177 $3,177 $3,177 $3,177 $3,177 $1,743 $1,262 $1,262 $1,262 $1,262 $1,262 $1,262 $1,262 $914 $1,052 $5,391 $230 $230 $230 $230 $1,992 $616 $616 $616 $616 $616 $294 $186 $186 $186 $186 $186 $186 $186 $7,908 $9,100 $42,672 $1,789 $1,789 $1,789 $1,789 $13,308 $3,794 $3,794 $3,794 $3,794 $3,794 $2,036 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 PageS5 of 21

Duane Arnold Energy Center Detailed Annual Cost 2008 Dollars in Thousands Year Labor Mat. & Equip. Waste Other Subtotal 2033 $291 $111 $1 $859 $1,262 2034 $291 $111 $1 $859 $1,262 2035 $291 $111 $1 $859 $1,262 2036 $291 $111 $1 $859 $1,262 2037 $291 $111 $1 $859 $1,262 2038 $291 $111 $1 $859 $1,262 2039 $291 $111 $1 $859 $1,262 2040 $291 $111 $1 $859 $1,262 2041 $291 $111 $1 $859 $1,262 2042 $291 $111 $1 $859 $1,262 2043 $291 $111 $1 $859 $1,262 2044 $291 $111 $1 $859 $1,262 2045 $291 $111. $1 $859 $1,262 2046 $291 $111 $1 $859 $1,262 2047 $291 $111 $1 $859 $1,262 2048 $291 .$111 $1 $859 $1,262 2049 $291 $111 $1 $859 $1,262 2050 $291 $111 $1 $859 $1,262 2051 $291 $111 $1 $859 $1,262 2052 $291 $111 $1 $859 $1,262 2053 $291 $111 $1 $859 $1,262 2054 $702 $240 $3 $958 $1,903 2055 $770 $261 $3 $972 $2,006 2056 $770 $261 $3 $972 $2,006 2057 $770 $261 $3 $972 $2,006 2058 $770 $261 $3 $972 $2,006 2059 $770 $261 $3 $972 $2,006 Contingency $186 $186 $186 $186 $186 $186 $186 $186 $186 $186 $186 $186 $186 $186 $186 $186 $186 $186 $186 $186 $186 $281 $297. $297 $297 $297 $297 Total $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $1,448 $2,184 $2,303 $2,303 $2,303 $2,303 $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 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 $1,096 $7,877 $9,187 $9,187 $9,187 $9,187 $3,034 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $15 $9,244 $ 10,781 $10,781 $10,781 $10,781 $2,169 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $2,237 $2,609 $2,609 $2,609 $2,609 $1,024 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $1,112 $19,359 $22,577 $22,577 $22,577 $22,577 $6,227 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $144 $2,879 $3,357 $3,357 $3,357 $3,357 $909 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $1,256 $22,237 $25,934 $25,934 $25,934 $25,934 $7,136 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $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 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 $1,096' $7,885 $9,187 $9,187 $9,187 $9,187 $3,027 $1,988 $1,988 $1,992 $1,989 $1,989 $ 1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $15 $6,996 $8,152 $8,152 $8,152 $8,152 $1,782 $711 $711 $712 $711 $711 $711 $711. $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $2,239 $2,609 $2,609 $2,609 $2,609 $991 $719 $719 $826 $889 $889 $889 $889 $889 $889 $889 $889 $889 $889 $889 $889 $889 $889 $889 $889 $1,112 $17,120 $19,948 $19,948 $19,948 $19,948 $5,801 $3,418 $3,418 $3,531 $3,590 $3,590 $3,590 $3,590 $3,590 $3,590 $3,590 $3,590 $3,590 $3,590 $3,590 $3,590 $3,590 $3,590 $3,590 $3,590 $144 $2,543 $2,963 $2,963 $2,963 $2,963 $845 $488 $488 $505 $514 $514 $514 $514 $514 $514 $514 $514 $514 $514 $514 $514 $514 $514 $514 $514 $1,256 $19,662 $22,910 $22,910 $22,910 $22,910 $6,645 $3,906 $3,906 $4,036 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4, 104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $4,104 $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 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 $6,968 $8,013 $25,696 $282 $282 $282 $282 $3,141 $291 $291 $291 $291 $291 $291 $291 $291 $291 $291 $291 $291 $291 $29 $33 $9,662 $108 $108 $108 $108 $1,244 $111 $111 $111 $111 $111 $111 $0 $0 $1,879 $0 $0 $0 $0 $9,828 $1 $1 $1 $1 $1 $1 $1 $1 $1 $1 $1 $1 $1 $0 $0 $1,397 $1,170 $1,170 $1,170 $1,170 $2,938 $984 $984 $984 $984 $984 $984 $984 $984 $984 $984- $984 $984 $984 $6,998 $8,047 $38,635 $1,559 $1,559 $1,559 $1,55 9 $17,151 $1,388 $1,388 $1,388 $1,388 $1,388 $1,388 $1,388 $1,388 $1,388 $1,388 $1,388 $1,388 $1,388 $915 $1,052 $5,704 $230 $230 $230 $230 $3,365 $205 $205 $205 $205 $205 $205 $205 $205 $205 $205 $205 $205 $205 $7,913 $9,100 $44,343 $1,790 $1,790 $1,790 $1,790 $20,514 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $1,593 $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 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 $1,096 $7,883 $9,187 $9,187 $9,187 $9,187 $3,030 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $1,989 $15 $6,994 $8,152 $8,1512 $8,152 $8,152 $1,784 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $711 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $2,238 $2,609 $2,609 $2,609 $2,609 $1,023 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $754 $1,112 $17,115 $19,948 $19,948 $19,948 $19,948 $5,837 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $3,455 $144 $2,542 $2,963 $2,963 $2,963 $2,963 $850 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $494 $1,256 $19,657 $22, '910 $22,910 $22,910 $22,910 $6,688 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $3,949 $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}}

ML090570189

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ML090570189

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