NG-23-0001, 2023 Annual Decommissioning and Spent Fuel Management Funding Status Report

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2023 Annual Decommissioning and Spent Fuel Management Funding Status Report
ML23088A206
Person / Time
Site: Duane Arnold, Maine Yankee  NextEra Energy icon.png
Issue date: 03/27/2023
From: Both J
NextEra Energy Duane Arnold
To:
Office of Nuclear Material Safety and Safeguards
References
NG-23-0001
Download: ML23088A206 (1)
v • d • e


Text

{{#Wiki_filter:I NEXTeraM ENERGY~ NG-23-0001 March 27, 2023 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, 2023 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. ;i/AJS0 l NextEra Energy Duane Arnold, LLC, 3277 DAEC Road, Palo, IA 52324 

                                                                                                 /v11,1S.52 Ip Nfv/SS

I NextEra Duane Arnold, LLC Duane Arnold Energy Center NG-23-0001 Page 2 of 2 provides the 2023 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 Tracy Weaver at (319) 851-7250. Respectfully, Jc~ 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 State of Iowa

Enclosure 1 Duane Arnold Energy Center 2023 Annual Decommissioning and Spent Fuel Management }funding Status Report As required by 10 CPR 50.75(f)(l) and 10 CFR 50.82(a)(8), Duane Arnold Energy Center (DAEC) reports the following information: A. Current Decommissioning Cost Estimate (License 'fermination, 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 tennination 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 $1,191,607,211 (for period of2019-2080, escalated to 2022 dollars). Of that total cost estimate, the current site-specific cost estimate for license tem1ination expenses of Duane Arnold Energy Center is $844,755,544. The current estimate of spent fuel management costs is $302,454,559. The current estimate for non-radiological site restoration is $42,485,151. The current estimate oflndependent Spent Fuel Storage Installation (ISFSI) demolition and decommissioning (D&D) costs is $1,911,956. H. Funding Balance for I ,iccnsc Termination Because DAEC is jointly owned among NextEra Energy Duane Arnold, LLC (NEDA), Central IO\va Power Cooperative (CIPCO), and Com Belt Power Cooperative (Com Belt), each Joint Owner (NEDA, CIPCO, and Corn 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, 2022 was $520,501,644, broken out as follows Trust Balance as of 12/31/22 Licensee ($Thousands) Duane Arnold - NextEra 409,492 Duane Arnold - CJPCO 74,203 Duane Arno1d - Corn Belt 36,807 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 ND Ts for spent fuel management activities. CIPCO and Corn Belt are not-for-profit electric cooperatives. CIPCO and Com Belt maintain internal supplemental reserve funds,

Enclosure 1 Duane Arnold Energy Center 2023 Annual Decommissioning and Spent Fuel Management Funding Status Report 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 termination costs, and these funds are not included as funds for satisfying NRC minimum license termination obligations. D. Annual Decommissioning Collections None. E. Rates Used to Escalate Decommissioning Costs and Fund Balances The estimates in the 2018 DCE have been inflated to 2022 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, 4.7% to escalate 2020 dollars to 2021 dollars, and 8.0% to escalate 2021 dollars to 2022 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 $1,911,956 (for period of2019-2080, escalated to 2022 dollars). The table below summarizes data presented in Attachments C-1, C-2 and, C-3 and demonstrates that adequate funding will remain following the decommissioning of the site to cover future ISFSI D&D costs (10 CFR 72.30). Projected Trust Fund ISFSI Decommissioning Trust Balance as of 12/31/22 Balance After Licensee Cost Estimate (2022$ Thousands) Decommissioning (2022$ Thousands) (2022$ Thousands) Duane Arnold - NextEra 409,492 247,218 1,338 Duane Arnold - CIPCO 74,203 48,216 382 Duane Arnold - Corn Belt 36,807 23,460 191

Enclosure 1 Duane Arnold Energy Center

  • 2023 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 irradiated fuel, in satisfaction of 10 CFR 50.82(a)(8)(vii). Attachment B provides the projected annual costs to decommission DAEC escalated to 2022 dollars. Attachment C-1 compares the NEDA NDT balance, accounting for a 2% real rate of return, against the estimated costs for license termination, 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 termination 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 termination, 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 2023 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, 2022 10 CFR 50.82 (a) (8) (v)-(vii) 2022 NEDA Decommissionina Trust $ 409491602 2022 CPCO Decommisslonlna Trust $ 74,203 035 2022 Corn Bell Oecomm!ssionina Trust $ 36,807007 2022 $ 13,676,700 $ 23,716,869 $ 174,212 $ $ 37,567782 Total $ 50.673 669 $ 91400055 $ 1110,728 $ $ 143184A62 Prtnr.Vear.Exoenclifures W*rlaiice'to Estimated CostK0.1121*118\ivi Bl~*:tr**~:;, .* '*. '. * ,.,,,\:', *~"'-~s:;iJ****aJ;'.** ~ ** * ,_**,,fi,1*~-.\*

  • 0 ... *' .*i *; * *: ~- :: ; *,:.t'. ',;:;;;, ~"SSl * * ' ' .*~,;t,1;;;-.. **. . *: ' *.;,
      * ;.:c*" * .: *year.                   .;;' .. i ' . ;Llcens-e;T~lriatlciii                      SoentF.uel :           . Slte'Restoratlon*.: * *'ISFSl'D&O*.:                                     *rcitiit .:'        .: 2.                          ,,.,          Comments,                                       ,,

2022Estimated $ 18,591,339 $ 67,080,541 $ $ $ 85,671,879 2022Actua! $ 13,676,700 $ 23,716,869 $ 174 212 $ $ 37,567,782 Variance $ 4,914,638 $ 43,363.671 $ 1174.212) $ $ 48,104,1)98 See below for variance commentarv Variance Commentary License Tennlnatlon: Favorable (lower, expenses compared to DCE esll mate driven by cost optiml:zallon and accelerated project llmelne Spent Fuel: Fa\lOrable (Lower) expenses compared to DCE estimate driven by final pool to pad spent fuel completed earlier than expected in the DCE study Sita Restoration: Immaterial unfa110rable (higher) expenses compared to DCE estimate driven by accelerated demolition 

$3.9 MM Accruals are reflected in total costs but not in reimbursements tCumiii.;t;;.,.,,*w111,ifrawalsfroin Decommissloriina Trliitst50'82fa'll811\l'IIA1*~, ,: ,.~; i ,,,,~0>*;-,\'/* ,~ ~ *. '*:fi : *f.*:*;,'..*:,*,c,~::..{7::.:)\::,,i;.'1,~                           *:'  ',:,,,.t:~*,** . ,'* "* ': "\;'..'*11: ,, ':\.,:,.j\_.,. *.". *: . *,::<:;.*:,":,:. '.*l :.,.:.:., *>!';;>:"'." '. :: "!
;;::",,il;-;t .. 'Yur, , *, .:., Y: iJ,o!i'.it:c>>.inill\ f!rikticllrt'l11fT1\rmlilation; *:: ;; I, .:'Sti*l'itffDet\ , :,:: '* Site 8ei1toratloit;.~' ~"' llSFSf.Ei::&b ': **               *:. i.:,.,/tt:rotat,       . .:_; '* :/.i,,ii;i:n ii,*   ::.- , ~, *'.., ;~°l>funlllnts-** *;: ,,,,;_- -,-i:-,~~-1.* ,.-..         *.~

Throuah 12131/2022 NEDA $ 32,204,STT $ 63,351,685 $ 775,215 $ $ 96,331,n? Throuah 12131/2022 CIPCO $ 10,057927 $ $ $ $ 10,057,927 Throuah 12/31/2022 Com Belt $ 5,119,734 $ $ $ $ 5,119,734 Tota1Throuah2022 $ 47,382,538 $ 63,351,685 $ 775,215 $ $ 111,509,438 iRenialnlnri,hecommlsslorilno~EiltimatedCost50.82fallRYii\iBl:/ll/iil/Bl- ,;* :'"'.:7 ::* . ***:; '< ' * ,;*~>~:~\,,:~: ,; ,* ::**,.;.* :** '.,.<"' ***<;_,' ; ... 't, :1 c*,,;: ":' . ; : *::* .>; ";;'('\ :* ~ .t'J~c -{ \, .:-,: \f. ' *:1 

 ', ~,: '. '..,r . . :,~~:'Year   r ,:*.' '" :*      ;-;t* i..,,,;1i]cense.i'1imilnii:fioif;,     :c :':'SiiirifFue( , ; :, SiteRestoration;*,: *: , 'ISFSl,Q&I),:,,; 1~:t, * **;*;11otal.. :*. :;,1v~k: .::*                           ;- \ :.    * .,:,.;;,,~.;*,,-:::f:qomments *' C"'. *. : .;,.,::,:, ,:,, .'". ,
  • 2022$ $ 728,229 $ 208957 $ 42.AR.,; $ 1,912 $ 981,583 Remaininadecomcostsfrom2023-2080escalatedto2022$

Enclosure 1 Duane Arnold Energy Center 2023 Annual Decommissioning and Spent Fuel Management Funding Status Report ATTACHMENTS Duane Arnold Energy Center Decommissioning Cost Estimate (100%Share) Estimates in 2022 Dollars (Thousands) License S~e Year Spent Fuel ISFSI D&D Total2022S Terrrination Restoration 2023 5.956 59345 - - 65,302 2024 17,363 3 756 - - 21,119 2025 6 533 3 769 - - 10,302 2026 2565 3.769 - - 6 334 2027 2130 3 769 - - 5,899 2028 2130 3 769 - - 5.899 2029 2130 3 769 - - 5 899 2030 2196 3 769 - - 5 965 2031 2.063 3 769 - - 5 832 2032 2.063 4 084 - - 6147 2033 2,063 4 088 - - 6 151 2034 2.063 4 088 - - 6 151 2035 2 063 4.088 - - 6 151 2036 2 063 4.088 - - 6 151 2037 2063 4 088 - - 6 151 2038 2063 4 088 - - 6 151 2039 2063 4 088 - - 6 151 2040 2.811 4 088 - - 6.899 2041 2,063 4 088 - - 6. 151 2042 2 063 4 088 - - 6 151 2043 2,063 4 088 - - 6 151 2044 2063 4 088 - - 6 151 2045 2063 4 088 - - 6,151 2046 2 063 4 088 - - 6151 2047 2 063 4 088 - - 6,151 2048 2 063 4 088 - - 6.151 2049 2,063 4 088 - - 6.151 2050 2,063 4 088 - - 6,151 2051 2 063 4.088 - - 6 151 2052 2 063 4.088 - - 6 151 2053 2063 4 088 - - 6 151 2054 2 395 4 088 - - 6483 2055 2 478 4088 - - 6 567 2056 2 063 4 088 - - 6,151 2057 2.063 4 088 - - 6.151 2058 2 063 4,088 - - 6 151 2059 2 517 3 391 - - 5,909 2060 3 587 - - - 3,587 2061 3070 - - - 3 070 2062 3 070 - - - 3 070 2063 3 070 - - - 3070 2064 3.070 - - - 3,070 2065 3,070 - - - 3070 2066 3 070 - - - 3 070 2067 3,070 - - - 3 070 2068 3070 - - - 3070 2069 3 070 - - - 3070 2070 3.070 - - - 3,070 2071 3,070 - - - 3 070 2072 3,070 - . - 3 070 2073 17.998 - - - 17.998 2074 38.010 - - - 38.010 2075 91.152 - - 215 91 367 2076 109,575 - - 469 110,045 2077 137 969 30 ,. 354 ~38 352 2078 117795 5.680 7241 852 131 568 2079 66 893 . 32.421 23 99 336 2080 5 628 - 2 823 - 8 451 Total 728;229 208,957 42,485 1,912 981,583

Enclosure 1 Duane Arnold Energy Center 2023 Annual Decommissioning and Spent Fuel Management Funding Status Report ATTACHMENT C-1 NextEra Energy Duane Arnold, LLC (70% Share) License Tennlnallon (50.82(a)(8)(v)) Spent Fuel (50.82(a)(B)(vii)J Estimates in 2022 Dolfars (Thousands) 1 Balance with 2% Rate of Return NEDA Ownership I Balance 70% 409,492 Annual Fund Eamlngs 2.0% Nn1Era70%Share of Costs E:llrrlblafrolll DecamTrust A B C *A+B C I.Jcense Year Termination Sport l'uel Site Re&toratlon ISFSI CID Total Beginning of Year Annual NOT EndolV-NDT Withdrawals Earnings llalanc:e 2023(!) 4,170 41.., 45711 409492 (49,6081 8.180 368.073 2024 12,154 2.629 . 14,783 358,073 (14,783) 7,361 360,651 2025 4,573 2,638 - 7,211 380,651 (7.211) 7,213 360,653 2026 1,796 2,638 . - 4,434 360,653 (4,434 7,213 363,433 2027 1491 2,638 . . 4,129 383,433 ("-129) 7.21l9 3flll572 2028 1491 2.638 . 4,129 386,572 (4.129 7,331 388.Tlfi 2029 1,491 2,638 4,129 369,775 (4,129 7,395 373,041 2030 1,537 2,638 4.176 373,041 (4.176 7,461 376326 2031 1,444 2.638 4.082 376.329 14.- 7,571 3711.771 2032 1,444 2.859 4.SOS 379,771 (4.= 7,595 383,1)63 2033 1,444 2.862 . 4.306 383,063 14.- 7,661 388,418 2034 1,444 2.862 4.306 388,418 (4,306) 1128 389,841 2035 1,444 2.862 . 4.306 389,841 (4.306) 7,787 393.332 2036 1,444 2.862 4,306 393,332 (4,300) 1.867 395,893 2037 1,444 2.!362 . 4,306 386,693 14.306) 7$31) 400,525 2038 1.444 2.852 . 4,306 400,525 (4,308) &,010 ,41)4,230 2039 1444 2,!362 - 4.306 404,;.30 (4.306) 8085 408,008 2040 2041 2042 1,!l68 1,444 1,444 2,852 2.882 2.862 4,828 4.306 4,306 408,008 411,339 415 260 

                                                                                                                                         * ~M (4,829 8,160 8,221 8,305 411,339 415,280 419.260 2043                   1,444           2.862                                                 4.306           419,260           14.-             8,31)5         423,339
                                                                                                                                        ~

2044 1,444 2.862 4,306 423,339 8,467 427.500 2045 1,444 2.862 4.a(ll 427.500 8,550 431,744 2046 1,444 2.862 4.306 431,744 8,635 436.073 2047 1444 2.852 . 4.306 436 073 (4,306) 8.721 440,489 2048 1,444 2.862 . 4,306 440489 (4,300) 4,810 444,993 2049 1,444 2.!362 . 4,306 444 993 14,306) a.aoo 449,587 2050 1,444 2.852 . . 4300 449,597 14.3061 8992 454,273 2051 1,444 2.!362 . 4,306 454.273 (d."""' 9,086 .... 053 2052 1,444 2,882 . 4306 459,053 (4,306 9,181 463,928 2053 1,4H 2,852 . 4.306 463,928 14,.... 9,279 "61l.901 2054 1,677 2,882 . 4.638 486,901 14538 9,378 473.740 2055 1,735 2,852 4.597 473,740 9,475 478.619 2056 2057 2058 2059 2060 2061 1,444 1,444 1,444 1,762 2,511 2149 2,862 2.862 2.852 2.374 4,306 4.306 4.306 4,138 2,511 2.1-48 478,619 483,885 489,257 

                                                                                                                       <49-173EI 500,495 507994 i(4.136)

(2,511) 

                                                                                                                                         '2,1491 9,572 9,678 11.785 9895 10,010 10160 483,885
                                                                                                                                                                         -257 494.735 500 495 507,994 516,005 2062                   2,149              -                                  .               2,148           516005            12.1491         10.320          524,176 2063                   2149                                 .                .               2148            524,178           12.1491         1Q.484          53'2510 2064                   2,149                                                                 2,149           532,510           (2,149)         10.650          541,012 2065                   2,149                                                 .               2,148           541,012           12.149          10820           549,883 2066                   2,149              -                                  -               2.149           549,683           (2,149)         10,994          558,526 2067                   2.149              -                                                  2.149           558,528           (2.1491         11,171          567,549 2068                   2,149                                                                 2.149           567,549           (2.1491         11,351          576,751 2059                   2.149              .                                                  2.149           576,751           12,1491         11,835           sae.137 2070                   2,149                                                                 2,148           588,137            (2.1491        ,1723            595,711 2071                   2,149                                                                 2,148           595,711            (2,1491        11,914          605,476 2072                   2,149                                                                 2.148           605476             (2,1491        12.110          615,437 2073                  12.599                                                                12.599           61$437           (12.-            12.309           615,147 2074                  26,607              .                 .                               '88(17           616,147          "86071           12.303           600,843 2075                  63 807              -                                  150            83,957           600,843          183,957)         12.017           548 902 2076                  75,703                                                 329            77,031           548,902          (77,031)         10,978           482.849 2077                  00,578               21               .                247            00,846           482,849          (96,AAA'l         9.657           395.660 2078                  82.456           3,976             5,059               596            92.097           395,880          (92,097)          7,-913          311.475 2079                  46,825                           22.694                  16           69~              311,476          189.5351          6,230           248,170 2080                   3,940                             1,976               .               5,816           248,170           ($,9161          4,983           247,218 2023
  • 2080 Total 509,760 146 270 29,740 1,338 687,108 1 2023 NDT withdrawal includes $3,897 of expenses that were not reimbursed during prior periods

Enclosure 1 Duane Arnold Energy Center 2023 Annual Decommissioning and Spent Fuel Management Funding Status Report ATTACHMENT C-2 CIPCO (20% Share} License Termination (60.82(a)(8)(v)) Estimates in 2022 Dollars (Thousands}/ Balance with 2%Raal Rate of Return CIPCO Ownership/ Balance 20% $ 74,203 Annual Fund Earnings 2.0% CIPCO 20% Share of Costs Eligible from Decom Trust A B C *A+B+C Uc:ense ISFSI D&D Total Beginning of Year Annual NOT End of Year NDT Termination Withdrawals Year Balanea Eemlngs Balance 2023121 1,191 . 1,191 74,203 (1,268' 1,484 74,419 2024 3,473 . 3,473 74,419 (3,473 1,488 72,435 2025 1,307 . 1,307 72,435 (1,307) 1,449 72,577 2026 513 . 513 72,577 (513) 1,452 73,515 2027 426 . 428 73,515 (426) 1,470 74,560 2028 426 . 428 74,560 (426 1,491 75,625 2029 426 - 426 75,625 (426) 1,512 76,711 2030 439 - 439 76,711 (439) 1,534 77,806 2031 413 - 413 77,606 (413) 1,556 78,950 2032 413 . 413 78,950 (413) 1,579 60,116 

                                                                                                      ~

2033 413 413 80,118 1,602 81,306 2034 413 . 413 81,306 1,626 82,519 2035 413 - 413 62,519 1,650 83,757 2036 413 - 413 83,757 (413) 1,675 85,020 2037 413 - 413 85,020 (413) 1,700 86,308 2038 413 . 413 86,308 (413' 1,726 87,621 2039 413 - 413 87,621 (413) 1,752 88,981 2040 562 . 562 88,961 (562) 1,779 90,178 2041 413 . 413 90,176 (413) 1,804 91,569 2042 413 . 413 91,569 (413) 1,831 92,988 I 2043 413 - 413 92,988 (413) 1,860 94,435 2044 413 . 413 94,435 (413 1,889 95,911 2045 413 . 413 95,911 (413) 1,918 97,417 2046 413 . 413 97,417 (413) 1,948 96,952 2047 413 - 413 98,952 (413) 1,979 100,519 2048 413 . 413 100,519 (413) 2,010 102,116 2049 413 . 413 102,116 (413) 2,042 103,746 2050 413 . 413 103,746 (413) 2,075 105,409 2051 413 - 413 105,409 (413) 2,108 107,104 2052 413 - 413 107,104 (413) 2,142 108,834 2053 413 . 413 108,834 (413) 2,177 110,598 2054 479 - 479 110,598 (479 2,212 112,330 2055 496 - 496 112,330 114,061 (496) (413) 2,247 2,282 114,081 115,950 2056 413 413 2057 413 413 115,950 (413) 2,319 117,657 2058 413 . 413 117,857 (413) 2,357 H9,601 2059 503 - 503 119,801 (503) 2,396 121,894 2060 717 717 121,694 (717) 2,434 123,410 2061 614 - 614 123,410 (614 2,468 125,265 2062 614 - 614 125,265 (614) 2,505 127,1156 2063 614 - 614 127,156 (614) 2,543 129,085 2064 614 - 614 129,085 (614) 2,1182 131,053 2065 614 - 614 131,053 (614) (614) 2,821 2,661 133,0BO 135,107 2066 614 614 133,060 2067 614 - 614 135,107 (614) 2,702 137,195 2068 614 . 614 137,195 (614) 2,744 139,325 2069 614 . 614 139,325 (614 2,786 141,498 2070 614 -. 814 141,4118 (614) 2,830 143,713 2071 614 614 143,713 (614) 2,874 146,974 2072 614 . 614 145,974 (614 2,919 148,279 2073 3,000 - 3,600 148,279 (3,000) 2,966 147,645 2074 7,002 7,602 147,645 (7,602) 2,953 142,996 2075 18,230 43 18,273 142,996 (18,273) 2,660 127,5\!3 2076 21,915 94 22,009 127,563 (22,009) 2,552 108,125 2077 27,594 71 27,664 108,125 (27,864) 2,163 82,623 2078 23,559 170 23,729 82,623 (23,729) 1,652 60,548 2079 13,379 5 13,383 00,646 (13,383) 1,211 48,374 2080 1,126 - 1,126 48,374 (1,126) 967 48,218 2023 - 2080 Total 146,646 382 146,028 2 2023 NDT withdrawal includes $77 of expenses that were not reimbursed during prior periods

Enclosure 1 Duane Arnold Energy Center 2023 Annual Decommissioning and Spent Fuel Management Funding Status Report ATTACHMENT C-3 Corn Belt (10% Share) License Termination (50.82(a)(B)(v)) Estimates in 2022 Dollars (Thousands)/ Balance with 2% Real Rate of Return CB Ownership/ Balance 10% $ 36,807 Annual Fund Earnings 20% Corn Belt 10% Share of Costs Eligible from Decom Trust A B C =A+B+C License Year ISFSI D&D Total Beginning of Year Annual NDT End of Year NDT Termination Withdrawals Balance Earnings Balance 2023(3) 596 596 36,807 (543) 736 37,000 2024 1,736 1,736 37,000 (1,736) 740 36,004 2025 653 653 36,004 (653) 720 36,070 2026 257 257 36,070 (257) 721 36,535 2027 213 213 36,535 (213) 731 37,053 2028 213 213 37,053 (213) 741 37,581 2029 213 213 37,581 (213) 752 38,120 2030 220 220 38,120 (220) 762 38,662 2031 206 206 38,662 (206) 773 39,229 2032 206 206 39,229 (206) 785 39,808 2033 206 206 39,808 (206) 796 40,397 2034 206 206 40,397 (206) 808 40,999 2035 206 206 40,999 (206) 820 41,613 2036 206 206 41,613 (206) 832 42,239 2037 206 206 42,239 (206) 845 42,877 2038 206 206 42,877 (206) 858 43,528 2039 206 206 43,528 (206) 871 44,193 2040 281 281 44,193 (281) 884 44,795 2041 206 206 44,795 (206) 896 45,485 2042 206 206 45,485 (206) 910 46,188 2043 206 206 46,188 (206) 924 46,906 2044 206 206 46,906 (206) 938 47,638 2045 206 206 47,638 (206) 953 48,384 2046 206 206 48,384 (206) 968 49,146 2047 206 206 49,146 (206) 983 49,922 2048 206 206 49,922 (206) 998 50,714 2049 206 206 50,714 (206) 1,014 51,522 2050 206 206 51,522 (206) 1,030 52,346 2051 206 206 52,346 (206) 1,047 53,187 2052 206 206 53,187 (206) 1,064 54,044 2053 206 206 54,044 (206) 1,081 54,919 2054 240 240 54,919 (240) 1,098 55,778 2055 248 248 55,778 (248) 1,116 56,646 2056 206 206 56,646 (206) 1,133 57,572 2057 206 206 57,572 (206) 1,151 58,517 2058 206 206 58,517 (206) 1,170 59,481 2059 252 252 59,481 (252) 1,190 60,419 2060 359 359 60.419 (359) 1,208 61,269 2061 307 307 61,269 (307) 1,225 62,187 2062 307 307 62,187 (307) 1,244 63,124 2063 307 307 63,124 (307) 1,262 64,080 2064 307 307 64,080 (307) 1,282 65,054 2065 307 307 65,054 (307) 1,301 66,048 2066 307 307 66,048 (307) 1,321 67,062 2067 307 307 67,062 (307) 1,341 68,097 2068 307 307 68,097 (307) 1,362 69,151 2069 307 307 69,151 (307) 1,383 70,227 2070 307 307 70,227 (307) 1,405 71,325 2071 307 307 71,325 (307) 1,427 72,445 2072 307 307 72,445 (307) 1,449 73,586 2073 1,800 1,800 73,586 (1.800) 1,472 73,258 2074 3,801 3,801 73,258 (3,801) 1,465 70,923 2075 9,115 21 9,137 70,923 (9,137) 1,418 63,204 2076 10,958 47 11,004 63,204 (11,004) 1,264 53,464 2077 13,797 35 13,832 53,464 (13,832) 1,069 40,701 2078 11,779 85 11,865 40,701 (11,865) 814 29,650 2079 6,689 2 6,692 29,650 (6,692) 593 23,552 2080 563 563 23,552 (563) 471 23,460 2023 - 2080 Total 72,823 191 73,014 3 2023 NDT withdrawal is overdrawn by $52

Enclosure 1 Duane Arnold Energy Center 2023 Annual Decommissioning and Spent Fuel Management Funding Status Report ATTACHMENT D Duane Arnold Energy Center 2022 Decommissioning Cost Actual Expenses (100% Share) (dollars in thousands) 

            ,,,C      ,,',L'               ,;,,  ,,   Decbmmissioriin~*Expense
                                                                                                                   '    , ' ; , ,' """ ; 0-,;                         ,,  ,,2022 Actuals"'*

L T1 Safstor Plannina Total 5 L T2 Transition Following Shutdown Total 1675 Pavroll, Compensation & Labor Ohs (526 Contractors & Professional Services (68 Insurance (68 Taxes Other Than Income Taxes (41 Other 27 LT3 SAFSTOR Preparation Delay During Spent Fuel Pool Operations Total 8,064 Payroll, Compensation & Labor Ohs 6,533 Contractors & Professional Services 357 Licenses, Permits & Fees 549 Other Ooeratina i=vnenses (Utilities, etc.) 331 Material & Suoolies 116 Taxes Other Than Income Taxes 83 Other 95 LT4 Completion of SAFSTOR Preparations Total 5,346 Pavroll, Comoensation & Labor Ohs 3,380 Contractors & Professional Services 521 Other Ooeratina FYnenses (Utilities, etc.) 562 Licenses, Permits & Fees 410 Insurance 169 Material & Suoolies 126 Taxes Other Than Income Taxes 107 Other 71 LT5 Dormancy With Orv Storage Total 938 Pavro!l, Comoensation & Labor Ohs 552 Contractors & Professional Services 33 Licenses, Permits & Fees 129 Other Ooeratina 1-vnenses (Utilities, etc.) 106 Taxes Other Than Income Taxes 64 Other 54 LiCeOSe Tt?rrriiriation TOfal "., ~,h ..:* 

                                                                                                  '                                              ,,:                  1,           '.': ,;; ,,'f 3;577, Soent Fuel Planning (SF1) Total                                                                                                                                                               -

Spent Fuel Cooling During Zirc Fire Window (SF2} (36) Pavroll, Compensation & Labor Ohs 45 Contractors & Professional Services (17) Insurance (66) Other 2 Spent Fuel Transfer to Dry Storage (SF3) 20,392 Pavroll, Compensation & Labor Ohs 8,884 Contractors & Professional Services 10,347 Licenses, Permits & Fees 692 Other Ooeratina t:xoenses (Utilities, etc.) 176 Insurance 145 Material & Suoolies 108 Other 41 Orv Storaae Durina Comoletion of SAFSTOR Preoarations (SF4l 2,768 Pavroll, Comoensation & Labor Ohs 1,791 Contractors & Professional Services 454 Licenses, Permits & Fees 260 Insurance 212 Other 51 Orv Storaoe Durino Dormancv (LTS) 593 Pavroll, Comoensation & Labor Ohs 341 Contractors & Professional Services 32 Licenses Permits & Fees 161 Other 58 {J:. ~.:',, _,,,, "}',,ft . ~1t ~"'*~;~:~ r:.~,, . l'f' ').;,1 

             ,,-,,*'nt'Filel'Tofat:,, '.' << ': f                                                                     ,;~~v'\~* ;;,* I"',/' '\"" t'\\'.'. ..,!, *,w,, \;                   ,,,,,**23'*717, GF1 Clean Bulldlna Demolition During Decommissioning                                                                                                                                          174 Pavroll, Comoensalion & Labor Ohs                                                                                                                                                   18 Contractors & Professional Services                                                                                                                                               102 Material & Su001ies                                                                                                                                                                 40 Other                                                                                                                                                                               14 Greenfield Toial', }~;;~_-*'.i ;; _,?,,           ",,,i< ..,.,,w,¥*rn    .*-:,"J;:'."'I.":.' .iYi'M'"'~-~~ 1*;1r .. :i ...,:::ti, 1_,,~::)J.(_              ;,;, :::+lk~:,f", .f* ':i'i:,:~~\174 1
             .Total oecomiri1ss10n1na,'Excerise,i ,:),,i,t::," ... ,;*, ;,. ""':,,,,,*o,.:._;,' '::',,:

r' ~~ '*' ,;*, :;*;':,,, ::.!37,668:}}

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