NG-22-0041, and Independent Spent Fuel Storage Installation, 2022 Annual Decommissioning and Spent Fuel Management Funding Status Report

and Independent Spent Fuel Storage Installation, 2022 Annual Decommissioning and Spent Fuel Management Funding Status Report

ML22090A035
Person / Time
Site:	Duane Arnold, Maine Yankee
Issue date:	03/31/2022
From:	Hansen P NextEra Energy Duane Arnold
To:	Document Control Desk, Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
References
NG-22-0041
Download: ML22090A035 (11)

Text

NEXTera.

ENERGY~

DUANE ARNOLD NG-22-0041 March 31, 2022 10 CFR 50.75(f)(1) 10 CFR 50.82(a)(8)(v)

Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Duane Arnold Energy Center Docket No. 50-331 Renewed Facility Operating License No DPR-49 Duane Arnold Energy Center Independent Spent Fuel Storage Installation NRC Docket No.72-030

Subject:

Duane Arnold Energy Center, 2022 Annual Decommissioning and Spent Fuel Management Funding Status Report

References:

1) Letter, Curtland (NEDA) to U.S. NRC, "Certification of Permanent Cessation of Power Operations," NG-20-0074, dated August 27, 2020 (ML20240A067)

2) Letter, Curtland (NEDA) to U.S. NRC, "Certification of Permanent Removal of Fuel from the Reactor Vessel for Duane Arnold Energy Center," NG-20-0090, dated October 12, 2020 (ML20286A317)

3) Letter, Curtland (NEDA) to U.S. NRC, "Post Shutdown Decommissioning Activities Report," NG-20-0027, dated April 2, 2020 (ML20094F603)

4) Letter, Hansen (NEDA) to U.S. NRC, "Update to Spent Fuel Management Plan Pursuant to 10 CFR 50.54(bb)," NG-20-0078, dated January 13, 2021 (ML21014A455)

5) Letter, Wall (NRC) to D. Moul (NEDA) , "Duane Arnold Energy Center - Request for Exemption from 10 CFR 50.82(a)(8)(i)(A) and Section 75(h)(1)(iv)," dated August 12, 2020 (ML20171A627, ML20171A626)

In accordance with 10 CFR 50. 75(f)(1 ), 10 CFR 50.82(a)(8)(v), and 10 CFR 50.82(a)(8)(vii),

NextEra Energy Duane Arnold, LLC (NEDA) submits the annual status of decommissioning funding, status of funding for managing irradiated fuel, and the financial assurance status report for the Duane Arnold Energy Center (DAEC) .

In References 1 and 2, DAEC certified permanent cessation of power operation and permanent removal of fuel from the reactor vessel for DAEC. In Reference 3, DAEC submitted its Post-Shutdown Decommissioning Activities Report (PSDAR) containing a site-specific Decommissioning Cost Estimate (DCE) pursuant to 10 CFR 50.82(a)(4)(i) and 10 CFR 50.82(a)(8)(iii). In Reference 4, NEDA submitted a spent fuel management plan pursuant to 10 CFR 50.54(bb). In Reference 5, the NRC granted an exemption allowing NEDA to fund spent fuel management and site restoration costs from its Nuclear Decommissioning Trust.

NextEra En ergy Du ane Arnold , LLC, 3277 DAEC Road , Palo , IA 5232 4

I NextEra Duane Arnold , LLC Duane Arnold Energy Center NG-22-0041 Page 2 of 2 provides the 2022 Annual Decommissioning and Spent Fuel Management Funding Status Report.

No commitments to the NRC are made in this letter.

If you should have any questions about the enclosed reports, please contact Michael Davis, Nuclear Licensing Manager, at (319) 851-7032.

Respectfully,

~/1.~'\

Paul Hansen Decommissioning Director, Duane Arnold Energy Center NextEra Energy Duane Arnold , LLC

Enclosure:

As stated cc: Regional Administrator, USNRC, Region Ill Project Manager, USNRC, Duane Arnold Energy Center Inspector, USNRC, Duane Arnold Energy Center A. Leek (State of Iowa)

Enclosure 1 Duane Arnold Energy Center 2022 Annual Decommissioning and Spent Fuel Management Funding Status Report As required by 10 CFR 50.75(t)(l) and 10 CFR 50.82(a)(8), Duane Arnold Energy Center (DAEC) repo1is the following information:

A. Current Decommissioning Cost Estimate (License Termination, Spent Fuel Management, and Site Restoration)

As required by 10 CFR 50.82, DAEC completed a site-specific Decommissioning Cost Estimate (DCE), prepared by Energy Solutions LLC. The study was performed using the SAFSTOR decommissioning method. The DCE included expenses anticipated to be incurred for license termination activities (radiological remediation), interim spent fuel storage, and non-radiological site restoration activities. Based on the DCE (completed with 2018 data, revised January 2020), the total estimated cost to decommission DAEC is

$1,103,169,863 (for period of2019-2080, escalated to 2021 dollars). Of that total cost estimate, the cmrent site-specific cost estimate for license termination expenses of Duane Arnold Energy Center is $782,060,162. The current estimate of spent fuel management costs is $280,007,427. The current estimate for non-radiological site restoration is

$39,332,440. The current estimate oflndependent Spent Fuel Storage Installation (ISFSI) demolition and decommissioning (D&D) costs is $1,769,835.

B. Funding Balance for License Termination Because DAEC is jointly owned among NextEra Energy Duane Arnold, LLC (NEDA),

Central Iowa Power Cooperative (CIPCO), and Com Belt Power Cooperative (Com Belt), each Joint Owner (NEDA, CIPCO, and Com Belt) maintains nuclear decommissioning trust(s) respective to their undivided interest ownership share.

The total balance available in NRC-jurisdictional nuclear decommissioning trusts (NDTs) for DAEC as of December 31, 2021 was $671,505,944, broken out as follows Trust Balance as of 12/31/21 Licensee

($Thousands) 536,936 Duane Arnold - NextEra Duane Arnold - CIPCO 88,398 Duane Arnold - Corn Belt 46,171 C. Funding Balance for Spent Fuel Management In accordance with the exemption granted by the NRC on August 12, 2020 (Reference 5),

withdrawals from NEDA's NDT are used for decommissioning, spent fuel management and non-radiological site restoration purposes.

CIPCO and Com Belt did not seek an exemption to allow use of their NDTs for spent fuel management activities. CIPCO and Com Belt are not-for-profit electric

Enclosure 1 Duane Arnold Energy Center 2022 Annual Decommissioning and Spent Fuel Management Funding Status Report cooperatives. CIPCO and Corn Belt maintain internal supplemental reserve funds, outside of their NDTs, the use of which are not legally restricted like an NDT, for asset retirement and other purposes. These funds are sufficient to pay for spent fuel management and may be supplemented by operational income, if necessary. The CIPCO and Corn Belt supplemental funds are not commingled with the NDTs used for license te1mination costs, and these funds are not included as funds for satisfying NRC minimum license termination obligations.

D. Annual Decommissioning Collections There were no annual collections for 2021 and no collections anticipated.

E. Rates Used to Escalate Decommissioning Costs and Fund Balances The estimates in the 2018 DCE have been inflated to 2021 dollars in the estimates provided in Attachments B - C. The Bureau of Labor Statistics (BLS) data provided the basis for the decommissioning cost estimate inflation rate forecast. Decommissioning costs are inflated using average observed data for Consumer Price Index, for All-Urban Consumers. DAEC used a factor of 1.8% to escalate 2018 dollars to 2019 dollars,1.2%

to escalate 2019 dollars to 2020 dollars, and 4.7% to escalate 2020 dollars to 2021 dollars.

Anticipated NEDA, CIPCO, and Corn Belt NDT and supplemental fund balances incorporate a 2% annual real rate of return, consistent with the requirements of 10 CFR 50.75.

F. Current ISFSI Decommissioning Cost The current detailed site-specific ISFSI decommissioning cost estimate is$ 1,769,835 (escalated to 2021 dollars). The table below summarizes data presented in Attachments C-1, C-2 and, C-3 and demonstrates that adequate funding will remain following the decommissioning of the site to cover future ISFSI D&D costs (10 CFR 72.30).

Projected Trust Fund ISFSI Decommissioning Trust Balance as of 12/31/21 Balance After Licensee Cost Estimate (2021$ Thousands) Decommissioning (2021$ Thousands)

(2021$ Thousands)

Duane Arnold -

NextEra 536,936 546,629 1,239 Duane Arnold -

CIPCO 88,398 101,198 354 Duane Arnold -

Corn Belt 46,171 56,520 177

Enclosure 1 Duane Arnold Energy Center 2022 Annual Decommissioning and Spent Fuel Management Funding Status Report G. Contracts to Fund Decommissioning None.

H. Modification to Method of Providing Financial Assurance None.

I. Material Changes to Trust Agreements None.

J. Annual Report Conclusions Attachment A provides the amount spent on decommissioning, both cumulative and over the previous calendar year, the remaining balance of any decommissioning funds, an estimate of the costs to complete decommissioning work performed during the year, reflecting any difference between actual and estimated costs, in satisfaction of 10 CFR 50.82(a)(8)(v). Attachment A also provides the projected costs of managing spent fuel and the amount of funds accumulated to cover the cost of inadiated fuel, in satisfaction of 10 CFR 50.82(a)(8)(vii).

Attachment B provides the projected annual costs to decommission DAEC escalated to 2021 dollars.

Attachment C-1 compares the NEDA NDT balance, accounting for a 2% real rate of return, against the estimated costs for license te1mination, spent fuel management, and site restoration costs, demonstrating the NEDA NDT contains sufficient funds to cover license termination (50.82(a)(8)(v)) and spent fuel management (50.82(a)(8)(vii)) costs.

Attachment C-2 compares the CIPCO NDT balance, escalated at a 2% real rate of return, against the estimated costs for license termination, demonstrating the CIPCO NDT contains sufficient funds to cover license te1mination costs (50.82(a)(8)(v)).

Attachment C-3 compares the Com Belt NDT balance, escalated at a 2% real rate of return, against the estimated costs for license te1mination, demonstrating the Com Belt NDT contains sufficient funds to cover license termination costs (50.82(a)(8)(v)).

Thus, considering the current NDT balances, anticipated growth in those balances over time, and anticipated future license termination costs, the Joint Owners' trust funds are expected to have adequate funds for completion of license termination activities.

Similarly, considering the NEDA NDT balance and the CIPCO and Com Belt supplemental funds and other sources, the Joint Owners are expected to have adequate funds for spent fuel management activities.

Enclosure 1 Duane Arnold Energy Center 2022 Annual Decommissioning and Spent Fuel Management Funding Status Report Decommissioning Funding Status Report Duane Arnold Energy Center ATTACHMENT A Summary Information as of December 31, 2021 10 CFR 50.82 (a) (8) (v)-(vii)

Year Joint Owner Tvoe of Trust Fund Balance Comments 2021 NEDA Decommissionina Trust $ 536,936 ,348 2021 CIPCO Decommissionina Trust $ 88,398,165 2021 Com Belt Decommissionina Trust $ 46,171,431 Other Financial Assurance Methods Being Relied Upon 50.75(!)(1)

None Year License Termination SoentFuel Site Restoration ISFSI D&D Total Comments 2019-2020 $ 15,107,487 $ 21,527,654 $ 698,654 $ - $ 37,333,796 2021 $ 21,889,481 $ 46,152,805 $ 237 ,862 $ - $ 68,280,148 Total $ 36,996,968 $ 67,680,459 $ 936,516 $ - $ 105,613,943 Prior Year Exoenditures Variance to Estimated Cost 50.821all8llvl1 Bl Year License Termination SoentFuel Site Restoration ISFSI D&D Total Comments 2021 Estimated $ 47,197,200 $ 20,617,678 $ - $ - $ 67,814,878 2021 Actual $ 21,889,481 $ 46,152,805 $ 237,862 $ - $ 68,280,148 Variance $ 25,307,719 $ (25,535,127 $ (237,8621 $ - $ (465,270) See below for variance commentary Variance Commenta!Jl License Termination: Favorable (lower) expenses compared to DCE estimate driven by cost optimization and accelerated project timeline Spent Fuel: Unfavorable (higher) expenses compared to DCE estimate driven by starting final pool to pad spent fuel campaign eartier than expected in the DCE study Site Restoration: Unfavorable (higher) expenses compared to DCE estimate driven by storm recovery activities and cost schedule optimization Accruals are reflected in total costs but not in reimbursements Cumulative Withdrawals from Decommissionino Trusts 50.821all811vl1Al Year Joint Owner License Termination Spent Fuel Site Restoration ISFSID&D Total Comments Through 12/31/2021 NEDA $ 20,465,895 $ 37,010,322 $ 620,965 $ - $ 58,097,182 Throuah 12/3 1/2021 CIPCO $ 7,236,704 $ - $ - $ - $ 7,236,704 Throuah 12/31 /2021 Com Belt $ 3,484,230 $ - $ - $ - $ 3,484,230 Total Throuqh 2020 $ 31,186,829 $ 37,010,322 $ 620,965 $ - $ 68,818,116 Remainino Decommissionina Estimated Cost 50.821all8llvl1Bl /lviillBl Year License Termination Soent Fuel Site Restoration ISFSID&D Total Comments 2021 $ $ 691,393 ,682 $ 255,550,852 $ 39,332,033 $ 1,770,057 $ 988,046,623 Remaining decom costs from 2022 - 2080 escalated to 2021 $

Decommissioning Criiteria Upon Which the Estimate is Based 50.75(!)(1) 50.82(a)(8)(v)(Bl SAFSTOR Any Mo dification to Method of Providing Fin anc ial Assuran t e 50.75!fl!1l 50.82!al!8l!v)(CJ No Any Ma terial Changes to Trust Agreemen t Since Previous Report50.75!fl(1 So.82(a)(8){v)(DJ In accordance with the exemption granted by NRC on August 12, 2020, withdrawals from NEDA's nuclear decommissioning trust (NOT) for spent fuel management purposes; request for Exemption from 10 CFR 50.82(a)(8)_(i)(A) and Section _75(h)(1)(iv)," dated August 12, 2020 (ML20171A627, ML20171A626)

Need for Additional Financial Assurance 50.75(!)(1) 50.82(a)(8)(vil (vii)(CJ See Attachment C

(

Enclosure 1 Duane Arnold Energy Center 2022 Annual Decommissioning and Spent Fuel Management Funding Status Report ATTACHMENT 8 Duane Arnold Energy Center Decommissioning Cost Estimate (100% Share)

Estimates in 2021 Dollars (Thousands)

License Site Year Spent Fuel ISFSID&D Total 2021 TemJinatlon Restoration 2022 17,212 62,102 - - 79,314 2023 5,514 54,941 - - 60,455 2024 16,074 3,477 - - 19,551 2025 6,048 3,489 - - 9,537 2026 2,375 3,489 - - 5,864 2027 1,972 3,489 - - 5,461 2028 1,972 3,489 - - 5,461 2029 1,972 3,489 - - 5,461 2030 2,033 3,489 - - 5,522 2031 1,910 3,489 - - 5,399 2032 1,910 3,781 - - 5,691 2033 1,910 3,785 - - 5,695 2034 1,910 3,785 - - 5,695 2035 1,910 3,785 - - 5,695 2036 1,910 3,785 - - 5,695 2037 1,910 3,785 - - 5,695 2038 1,910 3,785 - - 5,695 2039 1,910 3,785 - - 5,695 2040 2,602 3,785 - - 6,387 2041 1,910 3,785 - - 5,695 2042 1,910 3,785 - - 5,695 2043 1,910 3,785 - - 5,695 2044 1,910 3,785 - - 5,695 2045 1,910 3,785 - - 5,695 2046 1,910 3,785 - - 5,695 2047 1,910 3,785 - - 5,695 2048 1,910 3,785 - - 5,695 2049 1,910 3,785 - - 5,695 2050 1,910 3,785 - - 5,695 2051 1,910 3,785 - - 5,695 2052 1,910 3,785 - - 5,695 2053 1,910 3,785 - - 5,695 2054 2,218 3,785 - - 6,002 2055 2,295 3,785 - - 6,079 2056 1,910 3,785 - - 5,695 2057 1,910 3,785 - - 5,695 2058 1,910 3,785 - - 5,695 2059 2,330 3,140 - - 5,470 2060 3,321 - - - 3,321 2061 2,842 - - - 2,842 2062 2,842 - - - 2,842 2063 2,842 - - - 2,842 2064 2,842 - - - 2,842 2065 2,842 - - - 2,842 2066 2,842 - - - 2,842 2067 2,842 - - - 2,842 2068 2,842 - - - 2,842 2069 2,842 - - - 2,842 2070 2,842 - - - 2,842 2071 2,842 - - - 2,842 2072 2,842 - - - 2,842 2073 16,662 - - - 16,662 2074 35,189 - - - 35,189 2075 84,387 - - 199 84,586 2076 101,443 - - 435 101,877 2077 127,729 27 - 327 128,084 2078 109,053 5 258 6 704 788 121,803 2079 61,928 - 30,014 21 91,963 2080 5,210 - 2,614 - 7,824 Total 691,394 255,551 39,332 1,770 988,047

Enclosure 1 Duane Arnold Energy Center 2022 Annual Decommissioning and Spent Fuel Management Funding Status Report ATTACHMENT C-1 NextEra Energy Duane Arnold, LLC (70% Share)

License Termination (50.82(a)(8)(v))

Spent Fuel (50.82(a)(8)(vii))

Estimates in 2021 Dollars (Thousands) I Balance with 2% Real Rate of Return NEDA Ownership I Balance 70% $ 536,936 Annual Fund Earnings 20%

NextEra 70% Share of Costs Eligible from De com Trust A B c =A+B+C License Year Tennlnallon Spent Fuel Site Restoration ISFSIO&O Total Beginning of Annual NOT End of Year NOT Withdrawls Year Balance Earnings Balance 2022< 11 12,048 43,471 55,520 536,936 (71,352) 10,739 476,323 2023 3,860 38,458 42,319 476,323 (42,319) 9,526 443,531 2024 11,252 2,434 13,686 443,531 (13,686) 8,871 438,716 2025 4,234 2,442 6,676 438,716 (6,676) 8,774 440,814 2026 1,662 2,442 4,105 440,814 (4,105) 8,816 445,526 2027 1,380 2,442 3,823 445,526 (3,823) 8,911 450,614 2028 1,380 2.442 3,823 450,614 (3,823) 9,012 455,803 2029 1,380 2.442 3,823 455,803 (3,823) 9,116 461,097 2030 1.423 2,442 3,866 461,097 (3,866) 9,222 466,453 2031 1,337 2,442 3,779 466,453 (3,779) 9,329 472,003 2032 1,337 2,647 3,984 472,003 (3,984) 9,440 477,459 2033 1,337 2,649 3,986 477,459 (3,986) 9,549 483,022 2034 1,337 2,649 3,986 483,022 (3,986) 9,660 488,696 2035 1,337 2,649 3,986 488,696 (3,986) 9,774 494,484 2036 1,337 2,649 3,986 494,484 (3,986) 9,890 500,387 2037 1,337 2,649 3,986 500,387 (3,986) 10,008 506,409 2038 1,337 2,649 3,986 506,409 (3,986) 10,128 512,551 2039 1,337 2,649 3,986 512,551 (3,986) 10,251 518,815 2040 1,822 2,649 4,471 518,815 (4,471) 10,376 524,721 2041 1,337 2,649 3,986 524,721 (3,986) 10,494 531,229 2042 1,337 2,649 3,986 531,229 (3,986) 10,625 537,867 2043 1,337 2,649 3,986 537,867 (3,986) 10,757 544,639 2044 1,337 2,649 3,986 544,639 (3,986) 10,893 551,545 2045 1,337 2,649 3,986 551,545 (3,986) 11,031 558,590 2046 1,337 2,649 3,986 558,590 (3,986) 11,172 565,775 2047 1,337 2,649 3,986 565,775 (3,986) 11,316 573,105 2048 1,337 2,649 3,986 573, 105 (3,986) 11,462 580,581 2049 1,337 2,649 3,986 580,581 (3,986) 11,612 588,206 2050 1,337 2,649 3,986 588,206 (3,986) 11,764 595,984 2051 1,337 2,649 3,986 595,984 (3,986) 11,920 603,917 2052 1,337 2,649 3,986 603,917 (3,986) 12,078 612,009 2053 1,337 2,649 3,986 612,009 (3,986) 12,240 620,263 11 2054 1,552 2,649 4,202 620,263 12,405 628,467 2055 1,606 2,649 4,255 628,467 12,569 636,781 2056 1,337 2,649 3,986 636,781 12,736 645,530 2057 1,337 2,649 3,986 645,530 (3,986) 12,911 654,455 2058 1,337 2,649 3,986 654,455 (3,986) 13,089 663,557 2059 1,631' 2,198 3,829 663,557 (3,829) 13,271 673,000 2060 2,325 2,325 673,000 (2,325) 13,460 684, 135 2061 1,989 1,989 684, 135 (1,989) 13,683 695,828 2062 1,989 1,989 695,828 (1,989) 13,917 707,755 2063 1,989 1,989 707,755 (1,989) 14,155 719,921 2064 1,989 1,989 719,921 (1,989) 14,398 732,330 2065 1,989 1,989 732,330 (1,989) 14,647 744,987 2066 1,989 1,989 744,987 (1,989) 14,900 757,897 2067 1,989 1,989 757,897 (1,989) 15,158 771,065 2068 1,989 1,989 771,065 (1,989) 15.421 784,497 2069 1,989 1,989 784,497 (1,989) 15,690 798,198 2070 1,989 1,989 798,198 (1,989) 15,964 812,172 2071 1,989 1,989 812,172 (1,989) 16,243 826,426 2072 1,989 1,989 826,426 (1,989) 16,529 840,965 2073 11,664 11,664 840,965 (11,664) 16,819 846,121 2074 24,632 24,632 846,121 (24,632 16,922 838,411 2075 59,071 139 59,210 838,411 (59,210 16,768 795,969 2076 71,010 304 71,314 795,969 (71,314) 15,919 740,574 2077 89,410 19 229 89,659 740,574 (89,659 14,811 665,727 2078 76,337 3,681 4,693 552 85,262 865,727 (85,262) 13,315 593,779 2079 43,350 21,010 15 64,374 593,779 (64,374) 11,876 541,280 2080 3,647 1,830 5,477 541,280 (5,477) 10,826 546,629 Total 483,976 178,886 27,532 1,239 691,633 1

2021 NDT withdrawal includes $15,833 of expenses that were not reimbursed during prior periods

Enclosure 1 Duane Arnold Energy Center 2022 Annual Decommissioning and Spent Fuel Management Funding Status Report ATTACHMENT C-2 CIPCO (20% Share)

License Tennination (50.82(a)(8)(v))

Estimates in 2021 Dollars (Thousands) I Balance with 2% Real Rate of Return CIPCO Ownership I Balance 20% $ 88,398 Annual Fund Earnings 2.0%

CIPCO 20% Share of Costs Eligible from Decom Trust A B c =A+B+C License ISFSID&D Total Beginning of Annual NDT End of Year NOT Termination Withdrawls Year Year Balance Earnings Balance 2022 12> 3,442 3,442 88,398 (3,605) 1,768 86,561 2023 1,103 - 1,103 86,561 (1,103) 1,731 87,189 2024 3,215 3,215 87,189 (3,215) 1,744 85,718 2025 1,210 1,210 85,718 (1,210) 1,714 86,223 2026 475 475 86,223 (475) 1,724 87,473 2027 394 394 87,473 (394) 1,749 88,828 2028 394 394 88,828 (394) 1,777 90,210 2029 394 394 90,210 (394) 1,804 91,620 2030 407 407 91,620 (407) 1,832 93,045 2031 382 382 93,045 (382) 1,861 94,524 2032 382 382 94,524 (382) 1,890 96,033 2033 382 382 96,033 (382) 1,921 97,572 2034 382 382 97,572 (382) 1,951 99,141 2035 382 382 99,141 (382) 1,983 100,742 2036 382 382 100,742 (382) 2,015 102,375 2037 382 382 102,375 (382) 2,047 104,040 2038 382 382 104,040 (382) 2,081 105,739 2039 382 382 105,739 (382) 2,115 107,472 2040 520 520 107,472 (520) 2,149 109,101 2041 382 382 109,101 (382) 2,182 110,901 2042 382 382 110,901 (382) 2,218 112,737 2043 382 382 112,737 (382) 2,255 114,610 2044 382 382 114,610 (382) 2,292 116,520 2045 382 382 116,520 (382) 2,330 118,468 2046 382 118,468 (382) 2,389 120,456 2047 382 382 120,456 (382) 2,409 122,483 2048 382 362 122,463 (362) 2,450 124,550 2049 362 362 124,550 (362) 2,491 126,659 2050 362 362 126,659 (382) 2,533 126,611 2051 362 362 128,811 (382) 2,576 131,005 2052 382 382 131,005 (382) 2,620 133,243 2053 382 362 133,243 (382) 2,865 135,526 2054 444 444 135,526 (444) 2,711 137,793 2055 459 459 137,793 (459) 2,756 140,090 2056 382 362 140,090 (382) 2,802 142,509 2057 382 362 142,509 (382) 2,850 144,978 2058 382 382 144,978 (382) 2,900 147,495 2059 466 466 147,495 (466) 2,950 149,979 2060 664 664 149,979 (664) 3,000 152,314 2061 566 568 152,314 (568) 3,046 154,792 2062 568 568 154,792 (568) 3,096 157,320 2063 566 568 157,320 (568) 3,146 159,898 2064 566 566 159,896 (568) 3,196 162,527 2065 566 568 162,527 (568) 3,251 165,209 2066 568 568 165,209 (568) 3,304 167,945 2067 568 568 167,945 (568) 3,359 170,736 2068 568 566 170,736 (568) 3,415 173,582 2069 568 568 173,582 (568) 3,472 176,485 2070 566 568 176,485 (568) 3,530 179,446 2071 566 566 179,446 (568) 3,589 182,467 2072 568 566 182,467 (568) 3,649 185,548 2073 3,332 3,332 185,548 (3,332) 3,711 165,926 2074 7,038 7,038 185,926 (7,038) 3,719 162,607 2075 16,877 40 16,917 182,607 (16,917) 3,652 169,342 2076 20,289 67 20,375 169,342 (20,375) 3,387 152,353 2077 25,546 65 25,611 152,353 (25,611) 3,047 129,789 2078 21,811 158 21,968 129,789 (21,968) 2,596 110,417 2079 12,386 4 12,390 110,417 (12,390) 2,208 100,235 2080 1,042 1,042 100,235 (1,042) 2,005 101,198 Total 138,279 354 138,633 2

2022 NDT withdrawal includes $163 of expenses that were not reimbursed during prior periods

Enclosure 1 Duane Arnold Energy Center 2022 Annual Decommissioning and Spent Fuel Management Funding Status Report ATTACHMENT C-3 Corn Belt(10% Share)

License Termination (50.82(a)(8)(v))

Estimates in 2021 Dollars (Thousands) I Balance with 2% Real Rate of Return CB Ownership I Balance 10% $ 46,171 Annual Fund Earnings 2.0%

Com Belt 10% Share of Costs Eligible from Decom Trust A B c =A+B+C License Year ISFSIO&D Total Beginning of Annual NOT End of Year NOT Tennination Withdrawls Year Balance Earnings Balance 2022< 3 > 1,721 1,721 46,171 (1,937) 923 45,158 2023 551 551 45,158 (551) 903 45,510 2024 1,607 1,607 45,510 (1,607) 910 44,813 2025 605 605 44,813 (605) 896 45,104 2026 237 237 45,104 (237) 902 45,769 2027 197 197 45,769 (197) 915 46,487 2028 197 197 46,487 (197) 930 47,220 2029 197 197 47,220 (197) 944 47,967 2030 203 203 47,967 (203) 959 48,723 2031 191 191 48,723 (191) 974 49,506 2032 191 191 49,506 (191) 990 50,305 2033 191 191 50,305 (191) 1,006 51,120 2034 191 191 51,120 (191) 1,022 51,952 2035 191 191 51,952 (191) 1,039 52,800 2036 191 191 52,800 (191) 1,056 53,665 2037 191 191 53,665 (191) 1,073 54,547 2038 191 191 54,547 (191) 1,091 55,447 2039 191 191 55,447 (191 1,109 56,365 2040 260 260 56,365 l?M' 1,127 57,232 2041 191 191 57,232 (191) 1,145 58,186 2042 191 191 58,186 (191) 1,164 59,159 2043 191 191 59,159 (191) 1,183 60,151 2044 191 191 60,151 (191) 1,203 61,163 2045 191 191 61,163 (191) 1,223 62,195 2046 191 191 62,195 (191) 1,244 63,248 2047 191 191 63,248 (191) 1,265 64,322 2048 191 191 64,322 (191) 1,286 65,417 2049 191 191 65,417 (191) 1,308 66,535 2050 191 191 66,535 (191) 1,331 67,674 2051 191 191 67,674 (191) 1,353 68,837 2052 191 191 68,837 (191) 1377 70,023 2053 191 191 70,023 (191) 1,400 71,232 2054 222 222 71,232 (222) 1,425 72,435 2055 229 229 72,435 (229) 1,449 73,654 2056 191 191 73,654 (191) 1,473 74,936 2057 191 191 74,936 (191) 1,499 76,244 2058 191 - 191 76,244 (191) 1,525 77,578 2059 233 233 77,578 (233) 1,552 78,896 2060 332 332 78,896 (332) 1,578 80,142 2061 284 284 80,142 (284) 1,603 81,461 2062 284 284 81,461 (284) 1,629 82,806 2063 284 284 82,806 (284) 1,656 84,178 2064 284 284 84,178 (284) 1,684 85,577 2065 284 284 85,577 (284) 1,712 87,004 2066 284 284 87,004 (284) 1,740 88,460 2067 284 284 88,460 (284) 1,769 89,945 2068 284 284 89,945 (284) 1,799 91,460 2069 284 284 91,460 (284) 1,829 93,005 2070 284 284 93,005 (284) 1,860 94,581 2071 284 284 94,581 (284) 1,892 96,188 2072 284 284 96,188 (284) 1,924 97,828 2073 1,666 1,666 97,828 (1,666) 1,957 98,118 2074 3,519 3,519 98,118 (3,519) 1,962 96,562 2075 8,439 20 8,459 96,562 (8,459) 1,931 90,034 2076 10,144 43 10,188 90,034 (10,188) 1,801 81,647 2077 12,773 33 12,806 81,647 (12,806) 1,633 70,474 2078 10,905 79 10,984 70,474 (10,984) 1,40<1 60,900 2079 6,193 2 6,195 60,900 (6,195) 1,2 923 2080 521 521 55,923 (521) 1,118 56,520 Total 69,139 177 69,316 3

2022 NDT withdrawal includes $215 of expenses that were not reimbursed during prior periods

Enclosure 1 Duane Arnold Energy Center 2022 Annual Decommissioning and Spent Fuel Management Funding Status Report ATTACHMENT D Duane Arnold Energy Center 2021 Decommissioning Cost Actual Expenses (100% Share)

(dollars in thousands)

Decommissioning Expense 2021 Actual LT1 Safstor Planning Total 9 L T2 Transition Following Shutdown Total 14,991 Utility Staff - Payroll/Labor 7,864 Payroll - Other (Benefits, Severance, Retention, Workers Comp, etc.) 1,759 Reactor Disassembly/LPRM Tool & Ser\ice 2,670 Materials and Supplies 404 Energy 371 Licenses, Permits & Fees 347 Other 1,575 LT3 SAFSTOR Preparation Delay During Spent Fuel Pool Operations 6,766 Utility Staff- Payroll/Labor 4,291 Payroll - Other (Benefits, Severance, Retention, Workers Comp, etc.) 517 Energy 463 Licenses, Permits & Fees 217 Other 1,278 L T4 Completion of SAFSTOR Preparations 123 Materials and Supplies 118 Other 5 License Termination Total 21,889 Spent Fuel Planning (SF1) Total 39 Contractors & Professional Ser\ices 36 Other 3 Spent Fuel Cooling During Zirc Fire Window (SF2) 10,833 Spent Fuel Pool Operations Staff 4,018 Site Security 4,005 Payroll - Other (Benefits, Severance, Retention, Workers Comp, etc.) 829 Licenses, Permits & Fees 398 Nuclear Property and Liability Insurance 272 Materials, Ser\ices, & Supplies 195 Other 1, 115 Spent Fuel Transfer to Dry Storage (SF3) 35,281 Contractors & Professional Ser\ices 26,967 Site Security 3,382 Payroll - Other (Benefits, Severance, Retention, Workers Comp, etc.) 2,652 Nuclear Property and Liability Insurance 393 Energy 273 Licenses, Permits & Fees 257 Materials & Supplies 121 Other 1,236 Spent Fuel Total 46,153 GF1 Clean Building Demolition During Decommissioning 238 Contractors & Professional Ser\ices 229 Other 9 Greenfield Total 238 Total Decommissioning Expense 68,280