ML25093A222

Decommissioning Funding Status Report

ML25093A222
Person / Time
Site:	Millstone
Issue date:	03/26/2025
From:	James Holloway Dominion Energy Nuclear Connecticut
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
25-058
Download: ML25093A222 (1)

Text

Dominion Energy Nuclear Connecticut, Inc.

5000 Dominion Boulevard, Glen Allen, VA 23060 Dominion Energy.com

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Dominion

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Energy March 26, 2025 United States Nuclear Regulatory Commission Attention: Document Control Desk Washington, D. C. 20555-0001 DOMINION ENERGY NUCLEAR CONNECTICUT, INC.

MILLSTONE POWER STATION UNIT 1 DECOMMISSIONING FUNDING STATUS REPORT Serial No.:

NRA/JHH:

25-058 RO Docket No.: 50-245 License No.: DPR-21 Pursuant to 10 CFR 50.75(f)(1) and 10 CFR 50.82(a)(8)(v)-(vii), Dominion Energy Nuclear Connecticut, Inc. (DENC) is providing this report on the status of decommissioning funding for Millstone Power Station Unit 1 (MPS1 ).

The attachment provides the following information for MPS1:

Table I -

Decommissioning Funding Status Report for MPS1 Summary Information as of December 31, 2024 Table II - Decommissioning Funding Status Report for MPS1 Annual Cash Flow Analysis Starting January 1, 2025 through End of Decommissioning The following information is provided in support and as part of this filing:

1. The escalation of decommissioning costs from the Cost Study's 2024 dollars to 2025 dollars is 2.61 % and is based upon the average of CPI-U rates, Bureau of Labor Statistics, FCPIU.US CPI: Consumer Price Index for All Urban Consumers, (Index 1982-84=100, SA) for that period.

2. The escalation rate of decommissioning costs, shown in Table II is 0% based on assuming a 2% Real Rate of Return.

3. The growth rate on Trust Funds is the allowed 2% Real Rate of Return over the escalation rate.

4. No rate regulatory authority citation for MPS1 is referenced because MPS1 is a merchant unit.

5. There are no contracts upon which DENG is relying under paragraph 10 CFR 50.75(e)(1)(v) and there were no modifications to the current method of providing financial assurance since the last submitted report.

6. There are no annual funding amounts for MPS1.

Serial No.: 25-058 Docket No.: 50-245 Attachment, page 2 of 2

7. Trust Fund balances shown in this report are market value and after-tax on realized gains and losses. The Trust Fund balances have not been adjusted for unrealized gain or loss positions that are not currently taxable.

8. Since the previous annual submittal on March 26, 2024 (Serial No.24-100, ADAMS Accession No. ML24088A235) for MPS1, there have been no material changes to the Trust agreements established for nuclear decommissioning.

Please contact Julie Hough at (804) 273-3586 if you have any questions or require additional information.

Sincerely, James E. Holloway Vice President - Nuclear Engineering and Fleet Support Dominion Energy Nuclear Connecticut, Inc.

Attachment:

Decommissioning Funding Status Report for Millstone Power Station Unit 1, Summary Information as of December 31, 2024 Commitments made in this letter: None cc:

U. S. Nuclear Regulatory Commission Region I 2100 Renaissance Blvd, Suite 100 King of Prussia, Pennsylvania 19406-2713 Tanya Hood NRC Project Manager-Millstone Power Station, Unit 1 U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001

Attachment Serial No.: 25-058 Docket No.: 50-245 Decommissioning Funding Status Report for Millstone Power Station Unit 1 Summary Information as of December 31, 2024 Millstone Power Station - Unit 1 Dominion Energy Nuclear Connecticut, Inc. (DENC)

Serial No.: 25-058 Docket No.: 50-245 Attachment, page 1 of 3 Table I:

Decommissioning Funding Status Report for MPS1 Summary Information as of December 31, 2024 10 CFR 50.82 (a)(8)(v)-(vii)

(in millions} differences due to rounding Decommissioning Trust Fund Balances 10 CFR Reference l50.82(a)(S)(v)(A) l50.82(a)(S)(vii)(A)

Fund Balance Type of Trusts Comments 944.6 Unit 1 aualified fund balance Asof:

12/31/2024 Unit 1 non-aualified fund balance Asaf:

12/31/2024 3.8 Less costs incurred but not vet billed to Trust Actual Cast in:

2024 Dollars 940.8 Adiusted decommissionina fund balance As of:

12/31/2024 Other Financial Assurance Methods Being Relied Upon 1 O CFR Reference I 50.82( a)(S)(v)(A)

I None Prior Years Decommissioning Expenditures 10 CFR Reference l50.82(a)(S)(v)(A)

I Total License Term Spent Fuel Mgmt Site Restoration Comments 8.1 1.2 6.9 2024 Cost in:

2024 Dollars 119.0 53.5 65.5 2001-2023 Cost in:

As-Soent Dollars 127.1 54.7 72.4 Total Prior Year in:

As-Soent Dollars Prior Year Decommissioning Expenditures Variance to Estimated Cost 10 CFR Reference ls0.82(a)(S)(v)(B)

I Total License Term Spent Fuel Mgmt Site Restoration Comments 8.1 Actual Cost in 2024 Dollars 10.8 NRCAuth $ in 2024 Dollars 12.7) $

Variance: Higher provision for security costs.

Remaining Decommissioning Estimated Cost 1 O CFR Reference ls0.82(a)(S)(v)(B) ls0.82(a)(S)(vii)(B)

Total License Term Spent Fuel Mgmt Site Restoration Comments 915.9 624.9 271.8 19.2 Estimate in:

2025 Dollars Decommissioning Criteria Upon Which the Estimate is Based 1 O CFR Reference I 50.82(a)(S)(v)(B)

I SAFSTOR Any Modification To Method of Providina Financial Assurance 1 O CFR Reference lso.S2(a)(S)(v)(C)

I None Any Material Changes To Trust A11reement Since Previous Report 10 CFR Reference ls0.82(a)(B)(v)(D)

I None Need For Additional Financial Assurance 10 CFR Reference ls0.82(a)(S)(vi) ls0.82(a)(B)(vii)(C)

None See Annual Cash Flow Analysis in Table II Inputs to Remaining Cost and Funding Analysis I

I 2025 Start year of Remaining Cost and Funding analysis 2.61%

Escalate study dollars from Study Year to Start Year of Analysis usina an average of CPI rates 0.00%

Escalation rate 2025

&Bevond 2.00%

Fund arowth rate 2025

& Bevond (Reflects NRG allowed 2% Real Rate of Return)

Projected annual expenditures - see Annual Cash Flow Analysis in Table II Notes: Table I

1) Previous decommissioning expenditures represent the withdrawals from the nuclear decommissioning trusts made by Dominion Energy Nuclear Connecticut, Inc (DENG). These expenditures do not include the withdrawals made by the former owners of MPS1.

2) Expenditures include withdrawals for spent fuel management, consistent with DENC's previous notices to the NRG, as well as allowed ordinary administrative costs.

Table II:

Serial No.: 25-058 Docket No.: 50-245 Attachment, page 2 of 3 Decommissioning Funding Status Report for MPS1 Annual Cash Flow Analysis Starting January 1, 2025 through End of Decommissioning 10 CFR 50.82 (a)(S)(v)-(vii) tin millions) differences due to roundina Column 1

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Column 3

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Column 7 Beginning Earnings Remaining Remaining Remaining Remaining End of on License Termination Spent Fuel Mgmt Site Restoration SAFSTOR of Year Trust Funds Expenditures Expenditures Expenditures Expenditures Year Year Balance (Reflects 2% RRoR)

(Reflects 0% Esc)

(Reflects 0% Esc)

(Reflects 0% Esc)

(Reflects 0% Esc)

Balance 2025 940.8 18.7 $

1.7 $

6.7 8.4 $

951.1 2026 951.1 18.9 $

1.0 $

8.4 9.5 960.6 2027 960.6 19.1 1.0 $

8.4 9.5 970.3 2028 970.3 19.3 $

1.0 $

8.4 9.5 980.1 2029 980.1 19.5 1.0 $

8.4 9.5 $

990.2 2030 990.2 19.7 $

1.0 $

8.4 9.5 1,000.4 2031 1,000.4 $

19.9 $

1.0 $

8.4 9.5 1,010.9 2032 1,010.9 20.1 1.0 $

8.4 9.5 1,021.6 2033 1,021.6 20.3 $

1.0 $

8.4 9.5 $

1,032.5 2034 1,032.5 20.6 $

1.0 $

8.4 9.5 $

1,043.6 2035 1,043.6 20.8 $

1.0 $

8.4 9.5 1,054.9 2036 1 054.9 21.0 1.0 $

8.4 9.5 1,066.4 2037 1,066.4 21.2 1.0 $

8.4 9.5 1,078.2 2038 1,078.2 21.5 1.0 $

8.4 9.5 1,090.2 2039 1,090.2 21.5 4.7 $

22.6 27.3 1,084.5 2040 1,084.5 21.3 7.0 $

35.1 42.1 1,063.6 2041 1,063.6 $

21.0 $

2.3 20.7 23.1 1,061.6 2042 1,061.6 21.1 1.9 15.4 17.3 $

1,065.4 2043 1,065.4 21.2 $

1.7 13.1 14.7 $

1,071.8 2044 1,071.8 21.3 1.6 $

12.5 14.1 1,079.0 2045 1,079.0 21.4 1.6 $

12.5 14.1 1,086.4 2046 1,086.4 21.6 1.6 12.4 14.0 1 094.0 2047 1,094.0 21.8 1.5 10.9 12.4 1,103.3 2048 1,103.3 22.0 7.3 7.3 1,118.1 2049 1,118.1 22.1 31.0 31.0 $

1109.1 2050 1,109.1 21.2 96.0 96.0 $

1,034.4 2051 1,034.4 19.7 102.7 102.7 951.3 2052 951.3 17.8 121.6 0.3 121.9 $

847.2 2053 847.2 16.0 92.4 1.7 94.1 769.1 2054 769.1 14.8 54.7 4.5 $

59.2 $

724.7 2055 724.7 14.1 35.3 5.5 $

40.8 698.0 2056 698.0 13.7 26.9 3.5 $

30.4 $

681.3 2057 681.3 13.5 $

8.6 2.3 10.9 $

683.9 2058 683.9 13.6 $

3.3 1.4 $

4.7 $

692.8 2059 692.8 13.9 706.7 2060 706.7 14.1 720.8 2061 720.8 14.4 735.2 2062 735.2 14.7 749.9 2063 749.9 15.0 764.9 2064 764.9 15.3 780.2 2065 780.2 15.6 795.8 2066 795.8 15.9 811.7 2067 811.7 16.2 828.0 2068 828.0 16.6 844.5 2069 844.5 16.9 861.4 2070 861.4 17.2 878.7 2071 878.7 17.573 896.224 2072 896.2 17.924 914.148 2073 914.1 18.283 932.431 2074 932.4 18.649 951.080 2075 951.1 19.022 970.101 2076 970.1 19.402 989.503 2077 989.5 19.790 1,009.293 2078 1,009.3 20.186 1,029.479 2079 1,029.5 20.590 1,050.069 2080 1,050.1 21.001 1,071.070 2081 1,071.1 21.421 1,092.492 2082 1,092.5 21.850 1,114.341 2083 1,114.3 22.287 1 136.628 2084 1,136.6 22.733 1,159.361 2085 1,159.4 23.187 1,182.548 2086 1,182.5 23.651 1,206.199 2087 1,206.2 24.124 1,230.323 2088 1,230.3 24.606 1,254.929 2089 1,254.9 25.099 1 280.028 2090 1,280.0 25.601 1 305.628 2091 1,305.6 26.113 1,331.741 2092 1,331.7 26.635 1,358.376 2093 1,358.4 27.168 1,385.543 2094 1,385.5 27.711 1,413.254 2095 1,413.3 28.265 1,441.519 2096 1,441.5 28.830 1 470.350 2097 1,470.3 29.407 1,499.757 2098 1,499.8 29.995 1,529.752 2099 1,529.8 30.529 6.643 6.643 $

1 553.637 Remaining $ in 2025 Dollars 624.9 271.8 19.2 $

915.9 Est. Fund Balance (end of Decommissioning) (in Future$ escalated at 0.0% & 2.0% Real Rate of Return Fund Growth Rate) 1,553.6 Est. Fund Balance (end of Decommissioning) discounted to 2025 Dollars Discount Rate = 2.00%

358.9

Table II Definitions:

Column 1:

Beginning of Year Balance:

Serial No.: 25-058 Docket No.: 50-245 Attachment, page 3 of 3 Reflects the beginning-of-year Trust Fund balance at a 0.0% cost escalation rate and a 2.0% Real Rate of Return (RRoR) on fund growth.

Column 2:

Earnings on Trust Funds:

Reflects earnings on funds remaining in the trust. A 2.0% RRoR Fund growth rate is used for 2025 through 2099 which reflects the allowed 2.0% RRoR over a 0.0%

cost escalation rate.

The annual 2.0% RRoR earnings are calculated on the beginning balance less 50% of the projected annual expenditure for each year.

Column 3:

Remaining License Termination Expenditures:

Reflects the annual License Termination Plan cost portion at a 0.0% escalation rate from the Site Specific Estimate.

Column 4:

Remaining Spent Fuel Management Expenditures:

Reflects the annual Irradiated Fuel Management Plan cost portion at a 0.0%

escalation rate from the Site Specific Estimate. This column provides funding information for managing irradiated fuel as required by 10 CFR 50.82(a)(8)(vii).

Column 5:

Remaining Site Restoration Expenditures:

Reflects the annual Site Restoration Plan cost portion at a 0.0% escalation rate from the Site Specific Estimate.

Column 6:

Remaining SAFSTOR Expenditures:

Reflects the annual SAFSTOR Decommissioning Plan cost at a 0.0% escalation rate from the Site Specific Cost Estimate.

Column 7:

End of Year Balance:

Reflects the end of year Trust Fund balance after projected earnings are added and projected expenditures are deducted for the year specified at a 0.0%

escalation rate and a 2.0% RRoR on fund growth.

Tables I and II General Notes: (Any minor differences in totals are due to rounding)

1) Trust Fund balance reflects market value on December 31, 2024, net of taxes on realized gains and losses.

2) The 2.0% RRoR is based on the rate allowed by 10 CFR 50.75(e)(1)(i) and 10 CFR 50.82(a)(8)(vi).

3) The funding method for providing financial assurance for decommissioning MPS1 remains prepayment. The cash flow analysis in Table II demonstrates that the amounts accumulated in the Trust are sufficient, with credited earnings at a 2.0% RRoR, to cover the estimated cost of radiological decommissioning, spent fuel management, and site restoration.