Annual Return/Report of Employee Benefit Plan

Form 5500 Department of the Treasury Internal Revenue Service Department of Labor Employee Benefits Security Administration Pension Benefit Guaranty Corporation Part I Annual Report Identification Information For calendar plan year 2010 or fiscal plan year beginning Annual Return/Report of Employee Benefit Plan This form is required to be filed for employee benefit plans under sections 104 and 4065 of the Employee Retirement Income Security Act of 1974 (ERISA) and sections 6047(e), and 6058(a) of the Internal Revenue Code (the Code). Complete all entries in accordance with the instructions to the Form 5500. and ending A This return/report is for: È a multiemployer plan; È a multiple-employer plan; or ÈX a single-employer plan; È a DFE (specify) ÁÝÁ B This return/report is: È the first return/report; È the final return/report; È an amended return/report; È a short plan year return/report (less than 12 months). OMB Nos. 1210-0110 1210-0089 2010 This Form is Open to Public Inspection C If the plan is a collectively-bargained plan, check here............................................................ È D Check box if filing under: ÈX Form 5558; È automatic extension; È the DFVC program; È special extension (enter description) ßÞÝÜÛ Part II Basic Plan Information enter all requested information 1a Name of plan Employees' Retirement Plan of USEC Inc. 2a Plan sponsor s name and address (employer, if for a single-employer plan) (Address should include room or suite no.) 01/01/2010 12/31/2010 USEC Inc. ÜñÞñß Richard V. Rowland 6903 Rockledge Drive ½ñ± ïîíìëêéèç Bethesda ßÞÝÜÛ ïîíìëêéèç ßÞÝÜÛ Ý ÌÇÛÚÙØ ßÞô ÍÌ ðïîíìëêéèçðï ËÕ MD 20817-1818 Caution: A penalty for the late or incomplete filing of this return/report will be assessed unless reasonable cause is established. 1b Three-digit plan number (PN) 1c Effective date of plan 01/01/1994 ÇÇÇÇóÓÓóÜÜ 2b Employer Identification Number (EIN) 52-2107911 ðïîíìëêéè 2c Sponsor s telephone number (301)564-3328 ðïîíìëêéèç 2d Business code (see instructions) 325900 ðïîíìë Under penalties of perjury and other penalties set forth in the instructions, I declare that I have examined this return/report, including accompanying schedules, statements and attachments, as well as the electronic version of this return/report, and to the best of my knowledge and belief, it is true, correct, and complete. 002 ððï SIGN HERE SIGN HERE ÇÇÇÇóÓÓóÜÜ Richard V. Rowland ßÞÝÜÛ Signature of plan administrator Date Enter name of individual signing as plan administrator ÇÇÇÇóÓÓóÜÜ ßÞÝÜÛ Signature of employer/plan sponsor Date Enter name of individual signing as employer or plan sponsor SIGN ÇÇÇÇóÓÓóÜÜ ßÞÝÜÛ HERE Signature of DFE Date Enter name of individual signing as DFE For Paperwork Reduction Act Notice and OMB Control Numbers, see the instructions for Form 5500. Form 5500 (2010) v.092307.1

Form 5500 (2010) Page 2 3a Plan administrator s name and address (if same as plan sponsor, enter Same ) SAME ½ñ± ïîíìëêéèç ßÞÝÜÛ ïîíìëêéèç ßÞÝÜÛ Ý ÌÇÛÚÙØ ßÞô ÍÌ ðïîíìëêéèçðï ËÕ 4 If the name and/or EIN of the plan sponsor has changed since the last return/report filed for this plan, enter the name, EIN and the plan number from the last return/report: a Sponsor s name 3b Administrator s EIN ðïîíìëêéè 3c Administrator s telephone number ðïîíìëêéèç 4b EIN ðïîíìëêéè 4c PN ðïî 5 Total number of participants at the beginning of the plan year 5 ïîíìëêéèçðïî 365 6 Number of participants as of the end of the plan year (welfare plans complete only lines 6a, 6b, 6c, and 6d). a Active participants... 6a ïîíìëêéèçðïî 233 b Retired or separated participants receiving benefits... 6b ïîíìëêéèçðïî 72 c Other retired or separated participants entitled to future benefits... 6c ïîíìëêéèçðïî 65 d Subtotal. Add lines 6a, 6b, and 6c... 6d ïîíìëêéèçðïî 370 e Deceased participants whose beneficiaries are receiving or are entitled to receive benefits... 6e ïîíìëêéèçðïî 1 f Total. Add lines 6d and 6e... 6f ïîíìëêéèçðïî 371 g Number of participants with account balances as of the end of the plan year (only defined contribution plans complete this item)... 6g ïîíìëêéèçðïî h Number of participants that terminated employment during the plan year with accrued benefits that were less than 100% vested... 6h ïîíìëêéèçðïî 1 7 Enter the total number of employers obligated to contribute to the plan (only multiemployer plans complete this item)... 7 8a If the plan provides pension benefits, enter the applicable pension feature codes from the List of Plan Characteristic Codes in the instructions: ï ï ï ï ï ï ï ï ï ï 1A 1G b If the plan provides welfare benefits, enter the applicable welfare feature codes from the List of Plan Characteristic Codes in the instructions: ï ï ï ï ï ï ï ï ï ï 9a Plan funding arrangement (check all that apply) 9b Plan benefit arrangement (check all that apply) (1) È Insurance (1) È Insurance (2) È Code section 412(e)(3) insurance contracts (2) È Code section 412(e)(3) insurance contracts (3) ÈX Trust (3) ÈX Trust (4) È General assets of the sponsor (4) È General assets of the sponsor 10 Check all applicable boxes in 10a and 10b to indicate which schedules are attached, and, where indicated, enter the number attached. (See instructions) a Pension Schedules b General Schedules (1) ÈX R (Retirement Plan Information) (1) ÈX H (Financial Information) (2) È MB (Multiemployer Defined Benefit Plan and Certain Money Purchase Plan Actuarial Information) - signed by the plan actuary X (2) È I (Financial Information Small Plan) (3) È A (Insurance Information) (4) È C (Service Provider Information) (3) È SB (Single-Employer Defined Benefit Plan Actuarial (5) È D (DFE/Participating Plan Information) Information) - signed by the plan actuary (6) È G (Financial Transaction Schedules) X X

SCHEDULE SB (Form 5500) Department of the Treasury Internal Revenue Service Department of Labor Employee Benefits Security Administration Single-Employer Defined Benefit Plan Actuarial Information This schedule is required to be filed under section 104 of the Employee Retirement Income Security Act of 1974 (ERISA) and section 6059 of the Internal Revenue Code (the Code). Pension Benefit Guaranty Corporation File as an attachment to Form 5500 or 5500-SF. For calendar plan year 2010 or fiscal plan year beginning and ending Round off amounts to nearest dollar. Caution: A penalty of $1,000 will be assessed for late filing of this report unless reasonable cause is established. A Name of plan B Three-digit Employees' Retirement Plan of USEC Inc. C Plan sponsor's name as shown on line 2a of Form 5500 or 5500-SF D ðïîíìëêéè USEC Inc. 52-2107911 plan number (PN) Employer Identification Number (EIN) OMB No. 1210-0110 2010 This Form is Open to Public Inspection E Type of plan: XÈ Single È Multiple-A È Multiple-B F Prior year plan size: È 100 or fewer È 101-500 ÈX More than 500 Part I Basic Information 1 Enter the valuation date: Month 1 Day 1 Year 2010 2 Assets: a Market value... 2a óïîíìëêéèçðïîíìë 25,062,843 b Actuarial value... 2b óïîíìëêéèçðïîíìë 25,235,840 3 Funding target/participant count breakdown (1) Number of participants (2) Funding Target a For retired participants and beneficiaries receiving payment... 3a ïîíìëêéè 55 óïîíìëêéèçðïîíìë 5,810,906 b For terminated vested participants... 3b ïîíìëêéè 76 óïîíìëêéèçðïîíìë 2,888,124 c For active participants: (1) Non-vested benefits... 3c(1) óïîíìëêéèçðïîíìë 1,712,538 (2) Vested benefits... 3c(2) óïîíìëêéèçðïîíìë 15,912,983 (3) Total active... 3c(3) 234 óïîíìëêéèçðïîíìë 17,625,521 d Total... 3d ïîíìëêéè 365 óïîíìëêéèçðïîíìë 26,324,551 4 If the plan is at-risk, check the box and complete items (a) and (b)...è a Funding target disregarding prescribed at-risk assumptions... 4a óïîíìëêéèçðïîíìë b Funding target reflecting at-risk assumptions, but disregarding transition rule for plans that have been at-risk for fewer than five consecutive years and disregarding loading factor... 4b óïîíìëêéèçðïîíìë 5 Effective interest rate... 5 ïîíòïî% 6.71 6 Target normal cost... 6 óïîíìëêéèçðïîíìë 2,349,541 Statement by Enrolled Actuary To the best of my knowledge, the information supplied in this schedule and accompanying schedules, statements and attachments, if any, is complete and accurate. Each prescribed assumption was applied in accordance with applicable law and regulations. In my opinion, each other assumption is reasonable (taking into account the experience of the plan and reasonable expectations) and such other assumptions, in combination, offer my best estimate of anticipated experience under the plan. SIGN HERE Signature of actuary David Webber, FSA, EA ßÞÝÜÛ Type or print name of actuary Towers Watson Pennsylvania Inc. ßÞÝÜÛ Firm name 901 ïîíìëêéèç North Glebe Road ßÞÝÜÛ ïîíìëêéèç ßÞÝÜÛ Arlington ËÕ VA 22203 Address of the firm 01/01/2010 12/31/2010 09/23/2011 Date 11-06137 Most recent enrollment number (703)258-8000 ððï ÇÇÇÇóÓÓóÜÜ Telephone number (including area code) ïîíìëêé ïîíìëêéèçð If the actuary has not fully reflected any regulation or ruling promulgated under the statute in completing this schedule, check the box and see instructions For Paperwork Reduction Act Notice and OMB Control Numbers, see the instructions for Form 5500 or 5500-SF. Schedule SB (Form 5500) 2010 v.092308. 1 002 È

Schedule SB (Form 5500) 2010 Page 2- Part II Beginning of year carryover and prefunding balances 7 Balance at beginning of prior year after applicable adjustments (Item 13 from prior year)... (a) Carryover balance (b) Prefunding balance óïîíìëêéèçðïîíìë 0 óïîíìëêéèçðïîíìë 0 8 Portion used to offset prior year's funding requirement (Item 35 from prior year) óïîíìëêéèçðïîíìë0 óïîíìëêéèçðïîíìë0 9 Amount remaining (Item 7 minus item 8)... óïîíìëêéèçðïîíìë0 óïîíìëêéèçðïîíìë0 10 Interest on item 9 using prior year s actual return of 27.05 %... óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë 11 Prior year's excess contributions to be added to prefunding balance: a Excess contributions (Item 38 from prior year)... óïîíìëêéèçðïîíìë 1,879,775 b Interest on (a) using prior year's effective rate of 8.06 %... óïîíìëêéèçðïîíìë 151,510 c Total available at beginning of current plan year to add to prefunding balance... óïîíìëêéèçðïîíìë 2,031,285 d Portion of (c) to be added to prefunding balance... óïîíìëêéèçðïîíìë0 12 Reduction in balances due to elections or deemed elections... óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë 13 Balance at beginning of current year (item 9 + item 10 + item 11d - item 12)... óïîíìëêéèçðïîíìë0 óïîíìëêéèçðïîíìë0 Part III Funding percentages 14 Funding target attainment percentage... 14 ïîíòïî% 95.86 15 Adjusted funding target attainment percentage... 15 ïîíòïî% 95.86 16 Prior year s funding percentage for purposes of determining whether carryover/prefunding balances may be used to reduce current year s funding requirement... 16 110.43 ïîíòïî% 17 If the current value of the assets of the plan is less than 70 percent of the funding target, enter such percentage... 17 ïîíòïî% Part IV Contributions and liquidity shortfalls 18 Contributions made to the plan for the plan year by employer(s) and employees: (a) Date (MM-DD-YYYY) (b) Amount paid by employer(s) (c) Amount paid by employees (a) Date (MM-DD-YYYY) (b) Amount paid by employer(s) ÇÇÇÇóÓÓóÜÜ 09/14/2011 ïîíìëêéèçðïîíì 2,830,000 ïîíìëêéèçðïîíì ÇÇÇÇóÓÓóÜÜ ïîíìëêéèçðïîíì ïîíìëêéèçðïîíìëó ÇÇÇÇóÓÓóÜÜ ïîíìëêéèçðïîíì ïîíìëêéèçðïîíì ÇÇÇÇóÓÓóÜÜ ïîíìëêéèçðïîíì ïîíìëêéèçðïîíìëó ÇÇÇÇóÓÓóÜÜ ïîíìëêéèçðïîíì ïîíìëêéèçðïîíì ÇÇÇÇóÓÓóÜÜ ïîíìëêéèçðïîíì ïîíìëêéèçðïîíìëó ÇÇÇÇóÓÓóÜÜ ïîíìëêéèçðïîíì ïîíìëêéèçðïîíì ÇÇÇÇóÓÓóÜÜ ïîíìëêéèçðïîíì ïîíìëêéèçðïîíìëó ÇÇÇÇóÓÓóÜÜ ïîíìëêéèçðïîíì ïîíìëêéèçðïîíì ÇÇÇÇóÓÓóÜÜ ïîíìëêéèçðïîíì ïîíìëêéèçðïîíìëó ÇÇÇÇóÓÓóÜÜ ïîíìëêéèçðïîíì ïîíìëêéèçðïîíì Totals 18(b) 18(c) (c) Amount paid by employees 19 Discounted employer contributions - see instructions for small plan with a valuation date after the beginning of the year: a Contributions allocated toward unpaid minimum required contribution from prior years.... 19a óïîíìëêéèçðïîíìë b Contributions made to avoid restrictions adjusted to valuation date... 19b óïîíìëêéèçðïîíìë c Contributions allocated toward minimum required contribution for current year adjusted to valuation date... 19c óïîíìëêéèçðïîíìë 2,533,956 20 Quarterly contributions and liquidity shortfalls: a Did the plan have a "funding shortfall" for the prior year?...è Yes ÈX No b If 20a is "Yes," were required quarterly installments for the current year made in a timely manner?...è Yes c If 20a is "Yes," see instructions and complete the following table as applicable: 2,830,000 0 Liquidity shortfall as of end of Quarter of this plan year (1) 1st (2) 2nd (3) 3rd (4) 4th óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë È No

Schedule SB (Form 5500) 2010 Page 3 Part V Assumptions used to determine funding target and target normal cost 21 Discount rate: a Segment rates: 1st segment: 2nd segment: 3rd segment: ïîíòïîá% 5.03 ïîíòïîá% 6.73 ïîíòïî 6.82 % È N/A, full yield curve used b Applicable month (enter code)... 21b ï4 22 Weighted average retirement age... 22 ïî 62 23 Mortality table(s) (see instructions) È Prescribed - combined ÈX Prescribed - separate È Substitute Part VI Miscellaneous items 24 Has a change been made in the non-prescribed actuarial assumptions for the current plan year? If "Yes," see instructions regarding required attachment....è Yes 25 Has a method change been made for the current plan year? If "Yes," see instructions regarding required attachment....èx Yes È No 26 Is the plan required to provide a Schedule of Active Participants? If "Yes," see instructions regarding required attachment...èx Yes È No 27 If the plan is eligible for (and is using) alternative funding rules, enter applicable code and see instructions regarding attachment... Part VII Reconciliation of unpaid minimum required contributions for prior years 28 Unpaid minimum required contribution for all prior years... 28 óïîíìëêéèçðïîíìë 29 Discounted employer contributions allocated toward unpaid minimum required contributions from prior years (item 19a)... 29 óïîíìëêéèçðïîíìë 30 Remaining amount of unpaid minimum required contributions (item 28 minus item 29)... 30 óïîíìëêéèçðïîíìë0 Part VIII Minimum required contribution for current year 31 Target normal cost, adjusted, if applicable (see instructions)... 31 óïîíìëêéèçðïîíìë 2,349,541 32 Amortization installments: Outstanding Balance Installment a Net shortfall amortization installment... óïîíìëêéèçðïîíìë 1,088,711 óïîíìëêéèçðïîíìë 183,221 b Waiver amortization installment... óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë 33 If a waiver has been approved for this plan year, enter the date of the ruling letter granting the approval (Month Day Year )Áand the waived amount... 34 Total funding requirement before reflecting carryover/prefunding balances (item 31 + item 32a + item 32b - item 33)... 27 33 34 È No óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë 2,532,762 Carryover balance Prefunding balance Total balance 35 Balances used to offset funding requirement... óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë0 36 Additional cash requirement (item 34 minus item 35)... 36 óïîíìëêéèçðïîíìë 2,532,762 37 Contributions allocated toward minimum required contribution for current year adjusted to valuation date (Item 19c)... 37 óïîíìëêéèçðïîíìë 2,533,956 38 Interest-adjusted excess contributions for current year (see instructions)... 38 óïîíìëêéèçðïîíìë 1,194 39 Unpaid minimum required contribution for current year (excess, if any, of item 36 over item 37)... 39 óïîíìëêéèçðïîíìë0 40 Unpaid minimum required contribution for all years... 40 óïîíìëêéèçðïîíìë0 X

USEC Inc. Employees' Retirement Plan of USEC Inc. 2010 Schedule SB, Line 22 - Description of Weighted Average Retirement Age EIN 52-2107911 Plan Number 002 For each active participant, an expected retirement age was calculated, weighted in proportion to the probability that the individual would remain an active participant to each age and then retire at that age. The plan's weighted average retirement age of 62 is the arithmetic average of the expected retirement ages of all such participants on January 1, 2010. 9/23/2011 V:\11\RET\Valuation\Exec - Anl\Funding\All Plans\Government Forms\Schedule SB\HQ Schedule SB 2010\2010SchedSB-HQ-Line 22 Avg_Ret_Age.xls

USEC Inc. Employees Retirement Plan of USEC Inc. EIN 52-2107911 Plan Number: 002 2010 Schedule SB, Part V Statement of Actuarial Assumptions/Methods Actuarial Assumptions and Methods Economic Assumptions Funding interest rate basis: Applicable month September 2009, based on bond yields through August preceding the valuation date Yield curve basis Segment rates Transition from current liability rates No Funding interest rates: First segment rate 5.03% Second segment rate 6.73% Third segment rate 6.82% Effective interest rate 6.71% Annual rates of increase Salaries 4.75% Future Social Security wage bases 3.75% Pre-2001 lump sum interest rate 3.50% 9/23/2011 V:\11\RET\Valuation\Exec - Anl\Funding\All Plans\Government Forms\Schedule SB\HQ Schedule SB 2010\2010SchedSB-HQ-PartV-Statement of Actuarial Assumptions and Methods.doc

USEC Inc. Employees Retirement Plan of USEC Inc. EIN 52-2107911 Plan Number: 002 2010 Schedule SB, Part V Statement of Actuarial Assumptions/Methods Demographic Assumptions Mortality Healthy Separate rates for non-annuitants (based on RP-2000 "Employees" table without collar or amount adjustments, projected to 2025 using Scale AA) and annuitants (based on RP-2000 "Healthy Annuitants" table without collar or amount adjustments, projected to 2017 using Scale AA) Disabled Separate rates for non-annuitants (based on RP-2000 "Employees" table without collar or amount adjustments, projected to 2025 using Scale AA) and annuitants (based on RP-2000 "Healthy Annuitants" table without collar or amount adjustments, projected to 2017 using Scale AA) Termination Disability Retirement Rates varying by age and gender Sample rates: Age Male Female 15 23.5% 25.1% 20 17.9% 20.7% 25 12.5% 15.7% 30 9.8% 11.0% 35 8.0% 8.6% 40 6.6% 7.0% 45 4.5% 5.8% 50 2.3% 4.6% Railroad Retirement Board Disability Table, 1965 rate (male/female) Rates varying by age Age Rate 55-60 5% 61 10% 62 25% 63-64 20% 65 100% 9/23/2011 V:\11\RET\Valuation\Exec - Anl\Funding\All Plans\Government Forms\Schedule SB\HQ Schedule SB 2010\2010SchedSB-HQ-PartV-Statement of Actuarial Assumptions and Methods.doc

USEC Inc. Employees Retirement Plan of USEC Inc. EIN 52-2107911 Plan Number: 002 2010 Schedule SB, Part V Statement of Actuarial Assumptions/Methods Form of payment Percent married 85% Spouse age Covered pay Administrative expense Joint and 50% survivor annuity with pop-up (life annuity if unmarried), lump sum for benefit accruals prior to January 1, 2001 for future retirees; actual form for current retirees Wife three years younger than husband 2009 pensionable earnings projected forward Demographic Assumptions American Centrifuge Mortality $200,000 added to the target normal cost (inclusive of American Centrifuge) Healthy Separate rates for non-annuitants (based on RP-2000 "Employees" table without collar or amount adjustments, projected to 2025 using Scale AA) and annuitants (based on RP-2000 "Healthy Annuitants" table without collar or amount adjustments, projected to 2017 using Scale AA) Disabled Separate rates for non-annuitants (based on RP-2000 "Employees" table without collar or amount adjustments, projected to 2025 using Scale AA) and annuitants (based on RP-2000 "Healthy Annuitants" table without collar or amount adjustments, projected to 2017 using Scale AA) Termination Rates varying by age and gender Sample rates: Age Male Female 15 20 25 30 35 40 45 9.6% 8.1% 6.6% 5.2% 4.1% 3.2% 2.6% 12.6% 10.6% 8.6% 6.6% 5.2% 4.1% 3.2% 9/23/2011 V:\11\RET\Valuation\Exec - Anl\Funding\All Plans\Government Forms\Schedule SB\HQ Schedule SB 2010\2010SchedSB-HQ-PartV-Statement of Actuarial Assumptions and Methods.doc

USEC Inc. Employees Retirement Plan of USEC Inc. EIN 52-2107911 Plan Number: 002 2010 Schedule SB, Part V Statement of Actuarial Assumptions/Methods Disability Rates varying by age and gender Sample rates: Age Male Female 25 30 35 40 45 50 55.033%.043%.059%.093%.171%.338%.639%.041%.061%.097%.135%.217%.364%.566% Retirement Rates varying by age Age 50 51 52 53-55 56-59 60-61 62-66 67 Rate 2% 3% 4% 5% 8% 10% 30% 100% Percent electing married form of payment Form of payment Spouse age Covered pay Percent married 75% of males and 30% of females; actual for current retirees Actual for current retirees; for future retirees, joint & 50% survivor annuity with pop-up or life annuity based on above percent electing married form of payment Wife three years younger than husband 2009 pensionable earnings projected forward 80% of males and 60% of females; actual for current retirees Methods Valuation date Funding target Target normal cost First day of plan year Present value of accrued benefits Present value of benefits expected to accrue during plan year plus plan-related expenses expected to be paid from plan assets during plan year 9/23/2011 V:\11\RET\Valuation\Exec - Anl\Funding\All Plans\Government Forms\Schedule SB\HQ Schedule SB 2010\2010SchedSB-HQ-PartV-Statement of Actuarial Assumptions and Methods.doc

USEC Inc. Employees Retirement Plan of USEC Inc. EIN 52-2107911 Plan Number: 002 2010 Schedule SB, Part V Statement of Actuarial Assumptions/Methods Actuarial value of assets Benefits Not Valued Average of the fair market value of assets on the valuation date and the two immediately preceding valuation dates, adjusted for contributions, benefits, administrative expenses, and expected earnings. The average asset value must be within 10% of fair value, including contributions receivable. All benefits described in the Plan Provisions section of this report were valued. Towers Watson has reviewed the plan documents provided by USEC Inc. and, based on that review, is not aware of any significant benefits that were not valued. Change in Assumptions and Methods Since Prior Valuation USEC Inc. changed its interest basis under the PPA at January 1, 2010 to adopt the IRS-prescribed 24- month average segment rates based on bond yields through August 2009. At January 1, 2009, the interest basis was the IRS-prescribed one-month yield curve based on bond yields in the capital markets during the month of October 2008. The required mortality table used to calculate the funding target and target normal cost was updated to include one additional year of projected mortality improvements. Finally, changes were made to the allocation of disability benefits and the determination of the EIR to comply with final PPA regulations. Data Sources USEC Inc. furnished participant data and asset data as of the valuation date and the dates and amounts of 2009 plan year contributions. Data were reviewed for reasonableness and consistency, but no audit was performed. Assumptions or estimates were made by Towers Watson actuaries when data were not available. We are not aware of any errors or omissions in the data that would have a significant effect on the results of our calculations. 9/23/2011 V:\11\RET\Valuation\Exec - Anl\Funding\All Plans\Government Forms\Schedule SB\HQ Schedule SB 2010\2010SchedSB-HQ-PartV-Statement of Actuarial Assumptions and Methods.doc

USEC Inc. Employees Retirement Plan of USEC Inc. EIN 52-2107911 Plan Number: 002 2010 Schedule SB, Part V Summary of Plan Provisions Plan Provisions Effective Date January 1, 2007 (as amended) Eligibility The following are eligible to participate in the plan: Headquarters staff hired prior to September 1, 2008. First of the month coincident with or following the later of January 1, 1994 and date of hire. Employees currently enrolled in either the CSRS or FERS are not eligible. American Centrifuge employees hired before January 1, 2005 American Centrifuge employees hired after 2004 are only eligible if they transferred from USEC prior to May 1, 2008 with at least 20 years of service and first became American Centrifuge employees prior to May 1, 2008. Benefit Formulas Regular Formula 1.2% of final average earnings times credited service, plus $1,320 Minimum formula Alternate formula Opt-out $60 for each of the first 10 years of credited service, plus $84 for each of the next 10 years of credited service, plus $108 for each year of credited service over 20 years, plus 10% of final average earnings reduced by 1% per year less than 8, plus $1,320. 1.5% of final average earnings times credited service less 1.5% of projected Social Security times credited service subject to a maximum offset of 50% of projected Social Security. Employees who are participants in the plan are eligible to make an irrevocable election prior to the beginning of each plan year to opt out of future pension accruals. Upon opting out, these participants benefits under the plan are frozen. Normal Retirement Eligibility Age 65 Benefit Greatest of the three benefit formulas Unreduced Early Retirement Eligibility Age 62 with 10 years of credited service Age 60 with 30 years of credited service Age plus years of credited service at least equal to 85 Benefit Greatest of the three benefit formulas; Social Security is determined 9/23/2011 V:\11\RET\Valuation\Exec - Anl\Funding\All Plans\Government Forms\Schedule SB\HQ Schedule SB 2010\2010SchedSB-HQ-PartV-Summary of Plan Provisions.doc

USEC Inc. Employees Retirement Plan of USEC Inc. EIN 52-2107911 Plan Number: 002 2010 Schedule SB, Part V Summary of Plan Provisions assuming no future earnings after retirement. Note: if termination is involuntary, other than for cause, an additional 2 years credit for age and/or service will be given for purposes of meeting the eligibility for this unreduced benefit. Reduced Early Retirement Eligibility Benefit Disability Retirement Benefit Vested Termination Eligibility Benefit Death Benefits Eligibility Benefit Age 50 and 10 years of credited service Greatest of the three benefit formulas reduced by 5% per year prior to the earliest date the participant would be eligible for full benefits. Note: If termination is involuntary, other than for cause, an additional 2 years of age and/or service will be given for the purposes of meeting the eligibility for this reduced benefit. None, however, participants continue to accrue credited service while disabled. 5 years of credited service Greatest of the three benefit formulas, where the alternate formula is calculated by projecting the benefit to age 65 and multiplying the result by credited service at termination divided by credited service at age 65. For the regular and minimum benefit formulas, the flat dollar add-on benefit is also prorated by the same credited service fraction. Additionally, the portion of the minimum benefit formula that is based on 10% of final average earnings is reduced by 1% per year of service less than 10 instead of 8. Early payment allowed using a different reduction than early retirement (5/9 of 1% for each month of commencement prior to age 65 and after age 62, and 5/12 of 1% for each month of commencement prior to age 62), with payment commencing no earlier than 50. 5 years of credited service If participant dies after 10 years of credited service, death benefit is 50% of the benefit the participant could have received if he had retired, but not less than 25% of the accrued benefit, payable to the spouse and/or dependent children for life (or, if earlier, age 23 in the case of dependent children, unless the child is disabled). If participant dies with less than 10 years of credited service, death benefit is 50% of the benefit the participant would have received at age 65 in the form of a qualified joint and 50% survivor annuity payable at the participant s age 65. 9/23/2011 V:\11\RET\Valuation\Exec - Anl\Funding\All Plans\Government Forms\Schedule SB\HQ Schedule SB 2010\2010SchedSB-HQ-PartV-Summary of Plan Provisions.doc

USEC Inc. Employees Retirement Plan of USEC Inc. EIN 52-2107911 Plan Number: 002 2010 Schedule SB, Part V Summary of Plan Provisions Final Average Earnings Greater of the average of the highest 3 calendar years of the last 10 calendar years prior to retirement or termination or the average of the final 36 months prior to retirement or termination. Participants transferring to USEC Inc. from USEC receive continued service accruals under the USEC plan, but final average earnings are frozen at the date of transfer. Pensions for participants transferring from USEC are calculated using all service and pay at time of termination or retirement. Benefits are then offset by the USEC pension. Forms of Payment Post-2000 Accruals Life annuity; joint and 50% survivor annuity with pop-up provision for married employees; joint and 75% survivor annuity; Social Security leveling option; Social Security leveling option with 50% survivor annuity. Illustrative conversion factors for the joint and 50% survivor annuity with pop-up option are shown below. Spouse Age 50 59 64 70 Participant Age 50 59 64 70.951.966.974.983.906.930.944.960.868.897.914.937.812.844.865.894 All other annuity forms of payment are determined by actuarial equivalence based on the Towers Perrin Forster & Crosby 1971 Forecast Mortality Table and a 6.00% interest rate, subject to the 417(e) minimum assumption basis applicable for the Social Security leveling options. Pre-2001 Accruals Life annuity; 50%, 75% or 100% joint and survivor annuities; 5, 10, or 15 year certain and contingent annuities; lump sum Pre-2001 optional form factors are determined using the following formulas, where X is the participant s age and Y is the beneficiary s age: Period Certain and Continuous Option Certain Period Factor 5 Years.98 + (65-X)(.002) 10 Years.94 + (65-X)(.004) 15 Years.88 + (65-X)(.01) 9/23/2011 V:\11\RET\Valuation\Exec - Anl\Funding\All Plans\Government Forms\Schedule SB\HQ Schedule SB 2010\2010SchedSB-HQ-PartV-Summary of Plan Provisions.doc

USEC Inc. Employees Retirement Plan of USEC Inc. EIN 52-2107911 Plan Number: 002 2010 Schedule SB, Part V Summary of Plan Provisions Forms of Payment (cont.) Joint and Survivor Option Percentage Continued Factor 50%.92 (.0044)(X-Y) + (.0030)(65-X) 75%.88 (.0060)(X-Y) + (.0040)(65-X) 100%.85 (.0070)(X-Y) + (.0050)(65-X) Lump Sum Option Actuarial equivalence based on the UP-1984 Mortality Table set back four (4) years and on the immediate interest rate published by the PBGC to value lump sums as of the first day of the Plan Year, subject to 417(e) minimum. Maximum on Benefits and Pay All benefits and pay for any calendar year may not exceed the maximum limitations for that year as defined in the Internal Revenue Code. The plan provides for increasing the dollar limits automatically as such changes become effective. Future Plan Changes No future plan changes were recognized. Towers Watson is not aware of any future plan changes which are required to be reflected. Changes in Benefits Valued Since Prior Year There have been no changes in benefits valued since the prior year. 9/23/2011 V:\11\RET\Valuation\Exec - Anl\Funding\All Plans\Government Forms\Schedule SB\HQ Schedule SB 2010\2010SchedSB-HQ-PartV-Summary of Plan Provisions.doc

USEC Inc. Employees Retirement Plan of USEC Inc. EIN 52-2107911 Plan Number 002 Attachment to 2010 Schedule SB, line 25 Change in Method In accordance with 1.430(d)-1(g)(3)(ii)(A), automatic approval has been granted for the first plan year for which all the provisions of 1.430(d)-1, 1.430(f)-1, 1.430(g)-1, 1.430(i)-1, and 1.436-1 are reflected of any changes to funding methods permitted by the Pension Protection Act. 2010 is the first plan year for which all of these provisions were reflected, and thus all funding method changes are automatically approved. USEC Inc. changed its interest basis under the PPA at January 1, 2010 to adopt the IRS-prescribed 24-month average segment rates based on bond yields through August 2009. At January 1, 2009, the interest basis was the IRS-prescribed one-month yield curve based on bond yields in the capital markets during the month of October 2008. Finally, changes were made to the allocation of disability benefits and the determination of the EIR to comply with final PPA regulations. 9/23/2011 V:\11\RET\Valuation\Exec - Anl\Funding\All Plans\Government Forms\Schedule SB\HQ Schedule SB 2010\2010SchedSB-HQ-Line 25-Change in Method.doc

USEC Inc. Employees' Retirement Plan of USEC Inc. 2010 Schedule SB, Line 26 - Schedule of Active Participant Data EIN 52-2107911 Plan Number 002 Employees' Retirement Plan of USEC Inc. Summary of Employee Data as of January 1, 2010 Years of Credited Service Attained Age <1 1 to 4 5 to 9 10 to 14 15 to 19 20 to 24 25 to 29 30 to 34 35 to 39 40 & up Less than 25 Count - - - - - - - - - - 25 to 29 Count - 3 1 - - - - - - - 30 to 34 Count 2 6 3 1 - - - - - - 35 to 39 Count - 7 5 2 3 - - - - - 40 to 44 Count 1 2 5 5 5 2 - - - - 45 to 49 Count - 5 9 6 6 1 3 1 - - 50 to 54 Count 1 5 6 8 5-10 7 - - 55 to 59 Count 1 3 13 4 5 1 6 11 3-60 to 64 Count - 3 22 6 5 1 1 5 - - 65 to 69 Count 1 3 6 1 - - - 2 1 1 70 & up Count - 1 2 - - - - - - - Average Age: 52.5 Average Service: 13.7 9/23/2011 V:\11\RET\Valuation\Exec - Anl\Funding\All Plans\Government Forms\Schedule SB\HQ Schedule SB 2010\2010SchedSB-HQ-Line 26- Schedule of Active Participant Data.doc

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ͽ»¼ Ý øú± ³ ëëðð îð10 Ð ¹» í îò ²º± ³ ±² ±² Ñ» Í» ª ½» Ð ±ª ¼» λ½» ª ²¹ Ü»½ ± ²¼»½ ݱ³»² ±²ò Û ½» º± ±»» ±² º± ±³ ±«²»»¼» Œ ± ²» ï ¾±ª»ô ½±³»» ³ ²»²» ²»»¼»¼ ±» ½» ±²»½» ª ²¹ô ¼»½ ± ²¼»½ ô üëôððð ± ³±» ² ± ½±³»² ±² ø ò»òô ³±²» ± ² ²¹»» ±º ª ² ½±²²»½ ±²» ª ½»»²¼»»¼ ±» ² ±» ± ±²» ² ¼«²¹» ²» ò øí»» ² «½ ±² ò Russell Investments 91-1175091 ø Û²» ² ³» ²¼ Û Ò ± ¼¼» ø»» ² «½ ±² ø¾ Í» ª ½» ݱ¼»ø 28 ø½ λ ±² ±»³ ±» ô»³ ±»» ± ¹ ² ±²ô ±» ±² µ²± ² ± ¾» ó ²ó ²»» ø¼ Û²» ¼»½ ½±³»² ±² ¼ ¾» ²ò º ²±²»ô»²» óðóò ø» Ü ¼» ª ½» ±ª ¼»»½» ª» ²¼»½ ½±³»² ±²á ø ±«½» ±» ² ² ± ² ±² ± øº Ü ¼ ²¼»½ ½±³»² ±² ²½ «¼»» ¹ ¾» ²¼»½ ½±³»² ±²ô º± ½» ²»½» ª»¼»» ¼ ¼ ½ ± á ø¹ ø Û²» ± ²¼»½ Ü ¼»» ª ½» ½±³»² ±²»½» ª»¼ ¾ ±ª ¼» ¹ ª» ± ª ½» ±ª ¼»» ½ «¼ ²¹ º± ³«²» ¼ ±º» ¹ ¾» ²¼»½ ² ³±«² ± ½±³»² ±² º± ½ ± ³»¼ ³±«² á ²»»¼ Ç» Œ ±»»³»² øº ò º ²±²»ô»²» óðóò ïîíìëêéèçðïî íìë Ç» XÈ Ò± È Ç» XÈ Ò± È Investment ßÞÝÜManager 110,988 ïîíìëêéèçðïîíìë 0 Ç» È Ò± XÈ Towers Watson Pennsylvania Inc. 23-1159360 ø Û²» ² ³» ²¼ Û Ò ± ¼¼» ø»» ² «½ ±² ø¾ Í» ª ½» ݱ¼»ø 11 ø½ λ ±² ±»³ ±» ô»³ ±»» ± ¹ ² ±²ô ±» ±² µ²± ² ± ¾» ó ²ó ²»» ø¼ Û²» ¼»½ ½±³»² ±² ¼ ¾» ²ò º ²±²»ô»²» óðóò ø» Ü ¼» ª ½» ±ª ¼»»½» ª» ²¼»½ ½±³»² ±²á ø ±«½» ±» ² ² ± ² ±² ± øº Ü ¼ ²¼»½ ½±³»² ±² ²½ «¼»» ¹ ¾» ²¼»½ ½±³»² ±²ô º± ½» ²»½» ª»¼»» ¼ ¼ ½ ± á ø¹ ø Û²» ± ²¼»½ Ü ¼»» ª ½» ½±³»² ±²»½» ª»¼ ¾ ±ª ¼» ¹ ª» ± ª ½» ±ª ¼»» ½ «¼ ²¹ º± ³«²» ¼ ±º» ¹ ¾» ²¼»½ ² ³±«² ± ½±³»² ±² º± ½ ± ³»¼ ³±«² á ²»»¼ Ç» Œ ±»»³»² øº ò º ²±²»ô»²» óðóò ïîíìëêéèçðïî íìë Ç» È Ò± XÈ Ç» È Ò± È Actuary ßÞÝÜ 79,701 ïîíìëêéèçðïîíìë Ç» È Ò± È USI Consulting Group 13-4032401 ø Û²» ² ³» ²¼ Û Ò ± ¼¼» ø»» ² «½ ±² ø¾ Í» ª ½» ݱ¼»ø 13 ø½ λ ±² ±»³ ±» ô»³ ±»» ± ¹ ² ±²ô ±» ±² µ²± ² ± ¾» ó ²ó ²»» ø¼ Û²» ¼»½ ½±³»² ±² ¼ ¾» ²ò º ²±²»ô»²» óðóò ø» Ü ¼» ª ½» ±ª ¼»»½» ª» ²¼»½ ½±³»² ±²á ø ±«½» ±» ² ² ± ² ±² ± øº Ü ¼ ²¼»½ ½±³»² ±² ²½ «¼»» ¹ ¾» ²¼»½ ½±³»² ±²ô º± ½» ²»½» ª»¼»» ¼ ¼ ½ ± á ø¹ ø Û²» ± ²¼»½ Ü ¼»» ª ½» ½±³»² ±²»½» ª»¼ ¾ ±ª ¼» ¹ ª» ± ª ½» ±ª ¼»» ½ «¼ ²¹ º± ³«²» ¼ ±º» ¹ ¾» ²¼»½ ² ³±«² ± ½±³»² ±² º± ½ ± ³»¼ ³±«² á ²»»¼ Ç» Œ ±»»³»² øº ò º ²±²»ô»²» óðóò ïîíìëêéèçðïî íìë Ç» È Ò± XÈ Ç» È Ò± È Contract ßÞÝÜ Administrator 45,188 ïîíìëêéèçðïîíìë Ç» È Ò± È

ͽ»¼ Ý øú± ³ ëëðð îð10 Ð ¹» ìó Clark Schaefer Hackett 31-0800053 ø Û²» ² ³» ²¼ Û Ò ± ¼¼» ø»» ² «½ ±² ø¾ Í» ª ½» ݱ¼»ø 10 ø½ λ ±² ±»³ ±» ô»³ ±»» ± ¹ ² ±²ô ±» ±² µ²± ² ± ¾» ó ²ó ²»» ø¼ Û²» ¼»½ ½±³»² ±² ¼ ¾» ²ò º ²±²»ô»²» óðóò ø» Ü ¼» ª ½» ±ª ¼»»½» ª» ²¼»½ ½±³»² ±²á ø ±«½» ±» ² ² ± ² ±² ± øº Ü ¼ ²¼»½ ½±³»² ±² ²½ «¼»» ¹ ¾» ²¼»½ ½±³»² ±²ô º± ½» ²»½» ª»¼»» ¼ ¼ ½ ± á ø¹ ø Û²» ± ²¼»½ Ü ¼»» ª ½» ½±³»² ±²»½» ª»¼ ¾ ±ª ¼» ¹ ª» ± ª ½» ±ª ¼»» ½ «¼ ²¹ º± ³«²» ¼ ±º» ¹ ¾» ²¼»½ ² ³±«² ± ½±³»² ±² º± ½ ± ³»¼ ³±«² á ²»»¼ Ç» Œ ±»»³»² øº ò º ²±²»ô»²» óðóò ïîíìëêéèçðïî íìë Ç» È Ò± XÈ Ç» È Ò± È Ç» È Ò± È Auditor ßÞÝÜ 13,400 Northern Trust Company 36-1561860 ø Û²» ² ³» ²¼ Û Ò ± ¼¼» ø»» ² «½ ±² ø¾ Í» ª ½» ݱ¼»ø 21 ø½ λ ±² ±»³ ±» ô»³ ±»» ± ¹ ² ±²ô ±» ±² µ²± ² ± ¾» ó ²ó ²»» ø¼ Û²» ¼»½ ½±³»² ±² ¼ ¾» ²ò º ²±²»ô»²» óðóò ø» Ü ¼» ª ½» ±ª ¼»»½» ª» ²¼»½ ½±³»² ±²á ø ±«½» ±» ² ² ± ² ±² ± øº Ü ¼ ²¼»½ ½±³»² ±² ²½ «¼»» ¹ ¾» ²¼»½ ½±³»² ±²ô º± ½» ²»½» ª»¼»» ¼ ¼ ½ ± á ø¹ ø Û²» ± ²¼»½ Ü ¼»» ª ½» ½±³»² ±²»½» ª»¼ ¾ ±ª ¼» ¹ ª» ± ª ½» ±ª ¼»» ½ «¼ ²¹ º± ³«²» ¼ ±º» ¹ ¾» ²¼»½ ² ³±«² ± ½±³»² ±² º± ½ ± ³»¼ ³±«² á ²»»¼ Ç» Œ ±»»³»² øº ò º ²±²»ô»²» óðóò ïîíìëêéèçðïî íìë Ç» XÈ Ò± È Ç» XÈ Ò± È Ç» È Ò± XÈ Trustee ßÞÝÜ 7,627 0 ø Û²» ² ³» ²¼ Û Ò ± ¼¼» ø»» ² «½ ±² ø¾ Í» ª ½» ݱ¼»ø ø½ λ ±² ±»³ ±» ô»³ ±»» ± ¹ ² ±²ô ±» ±² µ²± ² ± ¾» ó ²ó ²»» ø¼ Û²» ¼»½ ½±³»² ±² ¼ ¾» ²ò º ²±²»ô»²» óðóò ø» Ü ¼» ª ½» ±ª ¼»»½» ª» ²¼»½ ½±³»² ±²á ø ±«½» ±» ² ² ± ² ±² ± øº Ü ¼ ²¼»½ ½±³»² ±² ²½ «¼»» ¹ ¾» ²¼»½ ½±³»² ±²ô º± ½» ²»½» ª»¼»» ¼ ¼ ½ ± á ø¹ ø Û²» ± ²¼»½ Ü ¼»» ª ½» ½±³»² ±²»½» ª»¼ ¾ ±ª ¼» ¹ ª» ± ª ½» ±ª ¼»» ½ «¼ ²¹ º± ³«²» ¼ ±º» ¹ ¾» ²¼»½ ² ³±«² ± ½±³»² ±² º± ½ ± ³»¼ ³±«² á ²»»¼ Ç» Œ ±»»³»² øº ò º ²±²»ô»²» óðóò ßÞÝÜ ïîíìëêéèçðïî íìë Ç» È Ò± È Ç» È Ò± È Ç» È Ò± È

ͽ»¼ Ý øú± ³ ëëðð îð10 Ð ¹» ëó Ð Í» ª ½» Ð ±ª ¼» ²º± ³ ±² ø½±² ²¼ í º ± ±»¼ ±² ²» » ±º ²¼»½ ½±³»² ±²ô ±» ²» ¹ ¾» ²¼»½ ½±³»² ±²ô ¾» ª ½» ±ª ¼» ô ²¼»» ª ½» ±ª ¼» º ¼«½ ± ±ª ¼» ½±² ½ ¼³ ² ± ô ½±² «²¹ô ½«±¼ ô ²ª» ³»² ¼ª ± ô ²ª» ³»² ³ ² ¹»³»² ô ¾ ±µ» ô ±»½± ¼µ»» ²¹» ª ½» ô ²»» º± ± ²¹ ±² º± ø» ½ ±«½» º ±³ ±³»» ª ½» ±ª ¼»»½» ª»¼ üïôððð ± ³±» ² ²¼»½ ½±³»² ±² ²¼ ø¾» ½ ±«½» º± ±³»» ª ½» ±ª ¼» ¹ ª» ±«º± ³«¼ ± ¼»» ³ ²»» ²¼»½ ½±³»² ±² ²» ¼ ±º ² ³±«² ±» ³»¼ ³±«² ±º» ²¼»½ ½±³»² ±²ò ݱ³»» ³ ²»²» ²»»¼»¼ ±» ±»» ¼ ²º± ³ ±² º±» ½ ±«½»ò ø Û²»» ª ½» ±ª ¼» ² ³»» ±² ²» î ø¾ Í» ª ½» ݱ¼» ø»» ² «½ ±² ø½ Û²» ³±«² ±º ²¼»½ ½±³»² ±² ø¼ Û²» ² ³» ²¼ Û Ò ø ¼¼» ±º ±«½» ±º ²¼»½ ½±³»² ±² ø» Ü» ½ ¾»» ²¼»½ ½±³»² ±²ô ²½ «¼ ²¹ ² º± ³«¼ ± ¼»» ³ ²»»» ª ½» ±ª ¼» Ž» ¹ ¾ º± ±» ³±«² ±º» ²¼»½ ½±³»² ±²ò ø Û²»» ª ½» ±ª ¼» ² ³»» ±² ²» î ø¾ Í» ª ½» ݱ¼» ø»» ² «½ ±² ø½ Û²» ³±«² ±º ²¼»½ ½±³»² ±² ø¼ Û²» ² ³» ²¼ Û Ò ø ¼¼» ±º ±«½» ±º ²¼»½ ½±³»² ±² ø» Ü» ½ ¾»» ²¼»½ ½±³»² ±²ô ²½ «¼ ²¹ ² º± ³«¼ ± ¼»» ³ ²»»» ª ½» ±ª ¼» Ž» ¹ ¾ º± ±» ³±«² ±º» ²¼»½ ½±³»² ±²ò ø Û²»» ª ½» ±ª ¼» ² ³»» ±² ²» î ø¾ Í» ª ½» ݱ¼» ø»» ² «½ ±² ø½ Û²» ³±«² ±º ²¼»½ ½±³»² ±² ø¼ Û²» ² ³» ²¼ Û Ò ø ¼¼» ±º ±«½» ±º ²¼»½ ½±³»² ±² ø» Ü» ½ ¾»» ²¼»½ ½±³»² ±²ô ²½ «¼ ²¹ ² º± ³«¼ ± ¼»» ³ ²»»» ª ½» ±ª ¼» Ž» ¹ ¾ º± ±» ³±«² ±º» ²¼»½ ½±³»² ±²ò

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SCHEDULE D (Form 5500) Department of the Treasury Internal Revenue Service Department of Labor Employee Benefits Security Administration For calendar plan year 2010 or fiscal plan year beginning DFE/Participating Plan Information This schedule is required to be filed under section 104 of the Employee Retirement Income Security Act of 1974 (ERISA). File as an attachment to Form 5500. A Name of plan Employees' Retirement Plan of USEC Inc. OMB No. 1210-0110 2010 This Form is Open to Public Inspection. 01/01/2010 and ending 12/31/2010 B Three-digit plan number (PN) C Plan or DFE sponsor's name as shown on line 2a of Form 5500 D Employer Identification Number (EIN) ðïîíìëêéè USEC Inc. 52-2107911 002 ððï Part I Information on interests in MTIAs, CCTs, PSAs, and 103-12 IEs (to be completed by plans and DFEs) (Complete as many entries as needed to report all interests in DFEs) a Name of MTIA, CCT, PSA, or 103-12 IE: Collective Short-Term Investment ßÞÝÜ b Name of sponsor of entity listed in (a): Northern Trust Company c EIN-PN d Entity e Dollar value of interest in MTIA, CCT, PSA, or 45-6138589 ïîíìëêéèçóïîí 084 C ï 275,894 a Name of MTIA, CCT, PSA, or 103-12 IE: code 103-12 IE at end of year (see instructions) óïîíìëêéèçðïîíìë Russell Emerging Markets Fund ßÞÝÜ b Name of sponsor of entity listed in (a): Russell Trust Company c EIN-PN d Entity e Dollar value of interest in MTIA, CCT, PSA, or 91-1117282 ïîíìëêéèçóïîí010 Cï 404,173 a Name of MTIA, CCT, PSA, or 103-12 IE: code 103-12 IE at end of year (see instructions) óïîíìëêéèçðïîíìë Russell Equity I Fund ßÞÝÜ b Name of sponsor of entity listed in (a): Russell Trust Company c EIN-PN d Entity e Dollar value of interest in MTIA, CCT, PSA, or 91-1117282 ïîíìëêéèçóïîí003 Cï 9,872,002 a Name of MTIA, CCT, PSA, or 103-12 IE: code 103-12 IE at end of year (see instructions) óïîíìëêéèçðïîíìë Russell Equity II Fund ßÞÝÜ b Name of sponsor of entity listed in (a): Russell Trust Company c EIN-PN d Entity e Dollar value of interest in MTIA, CCT, PSA, or 91-1117282 ïîíìëêéèçóïîí006 Cï 3,075,904 a Name of MTIA, CCT, PSA, or 103-12 IE: code 103-12 IE at end of year (see instructions) óïîíìëêéèçðïîíìë Russell International Fund ßÞÝÜ b Name of sponsor of entity listed in (a): Russell Trust Company c EIN-PN d Entity e Dollar value of interest in MTIA, CCT, PSA, or 91-1117282 ïîíìëêéèçóïîí005 Cï 3,345,368 a Name of MTIA, CCT, PSA, or 103-12 IE: code 103-12 IE at end of year (see instructions) óïîíìëêéèçðïîíìë Russell Multi-Manager Bond Fund ßÞÝÜ b Name of sponsor of entity listed in (a): Russell Trust Company c EIN-PN d Entity e Dollar value of interest in MTIA, CCT, PSA, or 91-1117282 ïîíìëêéèçóïîí038 Cï 7,746,801 a Name of MTIA, CCT, PSA, or 103-12 IE: code 103-12 IE at end of year (see instructions) óïîíìëêéèçðïîíìë Russell World Equity Fund ßÞÝÜ b Name of sponsor of entity listed in (a): Russell Trust Company c EIN-PN d Entity e Dollar value of interest in MTIA, CCT, PSA, or 91-1117282 ïîíìëêéèçóïîí046 Cï 2,856,188 code 103-12 IE at end of year (see instructions) óïîíìëêéèçðïîíìë For Paperwork Reduction Act Notice and OMB Control Numbers, see the instructions for Form 5500. Schedule D (Form 5500) 2010 v.092308.1

Schedule D (Form 5500) 2010 Page 2- a Name of MTIA, CCT, PSA, or 103-12 IE: b Name of sponsor of entity listed in (a): c EIN-PN ïîíìëêéèçóïîí a Name of MTIA, CCT, PSA, or 103-12 IE: b Name of sponsor of entity listed in (a): c EIN-PN ïîíìëêéèçóïîí a Name of MTIA, CCT, PSA, or 103-12 IE: b Name of sponsor of entity listed in (a): c EIN-PN ïîíìëêéèçóïîí a Name of MTIA, CCT, PSA, or 103-12 IE: b Name of sponsor of entity listed in (a): c EIN-PN ïîíìëêéèçóïîí a Name of MTIA, CCT, PSA, or 103-12 IE: b Name of sponsor of entity listed in (a): c EIN-PN ïîíìëêéèçóïîí a Name of MTIA, CCT, PSA, or 103-12 IE: b Name of sponsor of entity listed in (a): c EIN-PN ïîíìëêéèçóïîí a Name of MTIA, CCT, PSA, or 103-12 IE: b Name of sponsor of entity listed in (a): c EIN-PN ïîíìëêéèçóïîí a Name of MTIA, CCT, PSA, or 103-12 IE: b Name of sponsor of entity listed in (a): c EIN-PN ïîíìëêéèçóïîí a Name of MTIA, CCT, PSA, or 103-12 IE: b Name of sponsor of entity listed in (a): c EIN-PN ïîíìëêéèçóïîí a Name of MTIA, CCT, PSA, or 103-12 IE: b Name of sponsor of entity listed in (a): c EIN-PN ïîíìëêéèçóïîí d Entity code d Entity code d Entity code d Entity code d Entity code d Entity code d Entity code d Entity code d Entity code d Entity code ßÞÝÜ e ï Dollar value of interest in MTIA, CCT, PSA, or 103-12 IE at end of year (see instructions) óïîíìëêéèçðïîíìë ßÞÝÜ e ï Dollar value of interest in MTIA, CCT, PSA, or 103-12 IE at end of year (see instructions) óïîíìëêéèçðïîíìë ßÞÝÜ e ï Dollar value of interest in MTIA, CCT, PSA, or 103-12 IE at end of year (see instructions) óïîíìëêéèçðïîíìë ßÞÝÜ e ï Dollar value of interest in MTIA, CCT, PSA, or 103-12 IE at end of year (see instructions) óïîíìëêéèçðïîíìë ßÞÝÜ e ï Dollar value of interest in MTIA, CCT, PSA, or 103-12 IE at end of year (see instructions) óïîíìëêéèçðïîíìë ßÞÝÜ e ï Dollar value of interest in MTIA, CCT, PSA, or 103-12 IE at end of year (see instructions) óïîíìëêéèçðïîíìë ßÞÝÜ e ï Dollar value of interest in MTIA, CCT, PSA, or 103-12 IE at end of year (see instructions) óïîíìëêéèçðïîíìë ßÞÝÜ e ï Dollar value of interest in MTIA, CCT, PSA, or 103-12 IE at end of year (see instructions) óïîíìëêéèçðïîíìë ßÞÝÜ e ï Dollar value of interest in MTIA, CCT, PSA, or 103-12 IE at end of year (see instructions) óïîíìëêéèçðïîíìë ßÞÝÜ e ï Dollar value of interest in MTIA, CCT, PSA, or 103-12 IE at end of year (see instructions) óïîíìëêéèçðïîíìë

ê Part II a Plan name b Name of plan sponsor a Plan name b Name of plan sponsor a Plan name b Name of plan sponsor a Plan name b Name of plan sponsor a Plan name b Name of plan sponsor a Plan name b Name of plan sponsor a Plan name b Name of plan sponsor a Plan name b Name of plan sponsor a Plan name b Name of plan sponsor a Plan name b Name of plan sponsor a Plan name b Name of plan sponsor a Plan name b Name of plan sponsor Schedule D (Form 5500) 2010 Page 3- Information on Participating Plans (to be completed by DFEs) (Complete as many entries as needed to report all participating plans) c EIN-PN ïîíìëêéèçóïîí c EIN-PN ïîíìëêéèçóïîí c EIN-PN ïîíìëêéèçóïîí c EIN-PN ïîíìëêéèçóïîí c EIN-PN ïîíìëêéèçóïîí c EIN-PN ïîíìëêéèçóïîí c EIN-PN ïîíìëêéèçóïîí c EIN-PN ïîíìëêéèçóïîí c EIN-PN ïîíìëêéèçóïîí c EIN-PN ïîíìëêéèçóïîí c EIN-PN ïîíìëêéèçóïîí c EIN-PN ïîíìëêéèçóïîí

SCHEDULE H (Form 5500) Department of the Treasury Internal Revenue Service Department of Labor Employee Benefits Security Administration Pension Benefit Guaranty Corporation For calendar plan year 2010 or fiscal plan year beginning Financial Information This schedule is required to be filed under section 104 of the Employee Retirement Income Security Act of 1974 (ERISA), and section 6058(a) of the Internal Revenue Code (the Code). A Name of plan OMB No. 1210-0110 2010 File as an attachment to Form 5500. This Form is Open to Public Inspection 01/01/2010 and ending 12/31/2010 B Three-digit plan number (PN) Employees' Retirement Plan of USEC Inc. C Plan sponsor's name as shown on line 2a of Form 5500 D ðïîíìëêéè USEC Inc. 52-2107911 Part I Asset and Liability Statement Employer Identification Number (EIN) 002ððï 1 Current value of plan assets and liabilities at the beginning and end of the plan year. Combine the value of plan assets held in more than one trust. Report the value of the plan s interest in a commingled fund containing the assets of more than one plan on a line-by-line basis unless the value is reportable on lines 1c(9) through 1c(14). Do not enter the value of that portion of an insurance contract which guarantees, during this plan year, to pay a specific dollar benefit at a future date. Round off amounts to the nearest dollar. MTIAs, CCTs, PSAs, and 103-12 IEs do not complete lines 1b(1), 1b(2), 1c(8), 1g, 1h, and 1i. CCTs, PSAs, and 103-12 IEs also do not complete lines 1d and 1e. See instructions. Assets (a) Beginning of Year (b) End of Year a Total noninterest-bearing cash... 1a óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë b Receivables (less allowance for doubtful accounts): (1) Employer contributions... 1b(1) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë 2,830,000 (2) Participant contributions... 1b(2) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë (3) Other... 1b(3) óïîíìëêéèçðïîíìë 50 óïîíìëêéèçðïîíìë 34 c General investments: (1) Interest-bearing cash (include money market accounts & certificates of deposit)... 1c(1) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë (2) U.S. Government securities... 1c(2) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë (3) Corporate debt instruments (other than employer securities): (A) Preferred... 1c(3)(A) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë (B) All other... 1c(3)(B) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë (4) Corporate stocks (other than employer securities): (A) Preferred... 1c(4)(A) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë (B) Common... 1c(4)(B) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë (5) Partnership/joint venture interests... 1c(5) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë (6) Real estate (other than employer real property)... 1c(6) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë (7) Loans (other than to participants)... 1c(7) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë (8) Participant loans... 1c(8) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë (9) Value of interest in common/collective trusts... 1c(9) óïîíìëêéèçðïîíìë 25,062,793 óïîíìëêéèçðïîíìë 27,576,330 (10) Value of interest in pooled separate accounts... 1c(10) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë (11) Value of interest in master trust investment accounts... 1c(11) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë (12) Value of interest in 103-12 investment entities... 1c(12) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë (13) Value of interest in registered investment companies (e.g., mutual funds)... (14) Value of funds held in insurance company general account (unallocated contracts)... 1c(13) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë 1c(14) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë (15) Other... 1c(15) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë For Paperwork Reduction Act Notice and OMB Control Numbers, see the instructions for Form 5500 Schedule H (Form 5500) 2010 v. 092308.1

Schedule H (Form 5500) 2010 Page 2 1d Employer-related investments: (a) Beginning of Year (b) End of Year (1) Employer securities... 1d(1) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë (2) Employer real property... 1d(2) óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë 1e Buildings and other property used in plan operation... 1e óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë 1f Total assets (add all amounts in lines 1a through 1e)... 1f óïîíìëêéèçðïîíìë 25,062,843 óïîíìëêéèçðïîíìë 30,406,364 Liabilities 1g Benefit claims payable... 1g óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë 1h Operating payables... 1h óïîíìëêéèçðïîíìë 41,621 óïîíìëêéèçðïîíìë 37,986 1i Acquisition indebtedness... 1i óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë 1j Other liabilities... 1j óïîíìëêéèçðïîíìë óïîíìëêéèçðïîíìë 1k Total liabilities (add all amounts in lines 1g through1j)... 1k óïîíìëêéèçðïîíìë 41,621 óïîíìëêéèçðïîíìë 37,986 Net Assets 1l Net assets (subtract line 1k from line 1f)... 1l óïîíìëêéèçðïîíìë 25,021,222 óïîíìëêéèçðïîíìë 30,368,378 Part II Income and Expense Statement 2 Plan income, expenses, and changes in net assets for the year. Include all income and expenses of the plan, including any trust(s) or separately maintained fund(s) and any payments/receipts to/from insurance carriers. Round off amounts to the nearest dollar. MTIAs, CCTs, PSAs, and 103-12 IEs do not complete lines 2a, 2b(1)(E), 2e, 2f, and 2g. Income (a) Amount (b) Total a Contributions: (1) Received or receivable in cash from: (A) Employers... 2a(1)(A) óïîíìëêéèçðïîíìë 2,830,000 (B) Participants... 2a(1)(B) óïîíìëêéèçðïîíìë (C) Others (including rollovers)... 2a(1)(C) óïîíìëêéèçðïîíìë (2) Noncash contributions... 2a(2) óïîíìëêéèçðïîíìë 2,830,000 b (3) Total contributions. Add lines 2a(1)(A), (B), (C), and line 2a(2)... 2a(3) óïîíìëêéèçðïîíìë Earnings on investments: (1) Interest: (A) Interest-bearing cash (including money market accounts and certificates of deposit)... 2b(1)(A) óïîíìëêéèçðïîíìë (B) U.S. Government securities... 2b(1)(B) óïîíìëêéèçðïîíìë (C) Corporate debt instruments... 2b(1)(C) óïîíìëêéèçðïîíìë (D) Loans (other than to participants)... 2b(1)(D) óïîíìëêéèçðïîíìë (E) Participant loans... 2b(1)(E) óïîíìëêéèçðïîíìë (F) Other... 2b(1)(F) óïîíìëêéèçðïîíìë (G) Total interest. Add lines 2b(1)(A) through (F)... 2b(1)(G) óïîíìëêéèçðïîíìë0 (2) Dividends: (A) Preferred stock... 2b(2)(A) óïîíìëêéèçðïîíìë (B) Common stock... 2b(2)(B) óïîíìëêéèçðïîíìë (C) Registered investment company shares (e.g. mutual funds)... 2b(2)(C) (D) Total dividends. Add lines 2b(2)(A), (B), and (C) 2b(2)(D) óïîíìëêéèçðïîíìë0 (3) Rents... 2b(3) óïîíìëêéèçðïîíìë (4) Net gain (loss) on sale of assets: (A) Aggregate proceeds... 2b(4)(A) óïîíìëêéèçðïîíìë (B) Aggregate carrying amount (see instructions)... 2b(4)(B) óïîíìëêéèçðïîíìë (C) Subtract line 2b(4)(B) from line 2b(4)(A) and enter result... 2b(4)(C) óïîíìëêéèçðïîíìë 0

Schedule H (Form 5500) 2010 Page 3 (a) Amount 2b (5) Unrealized appreciation (depreciation) of assets: (A) Real estate... 2b(5)(A) óïîíìëêéèçðïîíìë (B) Other... 2b(5)(B) óïîíìëêéèçðïîíìë (C) Total unrealized appreciation of assets. Add lines 2b(5)(A) and (B)... 2b(5)(C) (b) Total óïîíìëêéèçðïîíìë0 (6) Net investment gain (loss) from common/collective trusts... 2b(6) óïîíìëêéèçðïîíìë 3,511,864 (7) Net investment gain (loss) from pooled separate accounts... 2b(7) óïîíìëêéèçðïîíìë (8) Net investment gain (loss) from master trust investment accounts... 2b(8) óïîíìëêéèçðïîíìë (9) Net investment gain (loss) from 103-12 investment entities... 2b(9) óïîíìëêéèçðïîíìë (10) Net investment gain (loss) from registered investment companies (e.g., mutual funds)... 2b(10) óïîíìëêéèçðïîíìë c Other income... 2c óïîíìëêéèçðïîíìë d Total income. Add all income amounts in column (b) and enter total... 2d óïîíìëêéèçðïîíìë 6,341,864 Expenses e Benefit payment and payments to provide benefits: (1) Directly to participants or beneficiaries, including direct rollovers... 2e(1) óïîíìëêéèçðïîíìë (2) To insurance carriers for the provision of benefits... 2e(2) óïîíìëêéèçðïîíìë (3) Other... 2e(3) óïîíìëêéèçðïîíìë (4) Total benefit payments. Add lines 2e(1) through (3)... 2e(4) óïîíìëêéèçðïîíìë 728,665 f Corrective distributions (see instructions)... 2f óïîíìëêéèçðïîíìë g Certain deemed distributions of participant loans (see instructions)... 2g óïîíìëêéèçðïîíìë h Interest expense... 2h óïîíìëêéèçðïîíìë i Administrative expenses: (1) Professional fees... 2i(1) óïîíìëêéèçðïîíìë 93,709 (2) Contract administrator fees... 2i(2) óïîíìëêéèçðïîíìë 43,774 (3) Investment advisory and management fees... 2i(3) óïîíìëêéèçðïîíìë 115,785 (4) Other... 2i(4) óïîíìëêéèçðïîíìë 12,775 266,043 (5) Total administrative expenses. Add lines 2i(1) through (4)... 2i(5) óïîíìëêéèçðïîíìë j Total expenses. Add all expense amounts in column (b) and enter total... 2j óïîíìëêéèçðïîíìë 994,708 Net Income and Reconciliation k Net income (loss). Subtract line 2j from line 2d... 2k óïîíìëêéèçðïîíìë 5,347,156 l Transfers of assets: (1) To this plan... 2l(1) óïîíìëêéèçðïîíìë (2) From this plan... 2l(2) óïîíìëêéèçðïîíìë Part III Accountant's Opinion 3 Complete lines 3a through 3c if the opinion of an independent qualified public accountant is attached to this Form 5500. Complete line 3d if an opinion is not attached. a The attached opinion of an independent qualified public accountant for this plan is (see instructions): (1) È Unqualified (2) È Qualified (3) XÈ Disclaimer (4) È Adverse b Did the accountant perform a limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)? ÈX Yes È No c Enter the name and EIN of the accountant (or accounting firm) below: 728,665 (1) Name: Clark Schaefer Hackett ßÞÝÜ (2) EIN: 31-0800053 ïîíìëêéèç d The opinion of an independent qualified public accountant is not attached because: (1) È This form is filed for a CCT, PSA, or MTIA. (2) È It will be attached to the next Form 5500 pursuant to 29 CFR 2520.104-50.

Schedule H (Form 5500) 2010 Page 4- Part IV Compliance Questions 4 CCTs and PSAs do not complete Part IV. MTIAs, 103-12 IEs, and GIAs do not complete 4a, 4e, 4f, 4g, 4h, 4k, 4m, 4n, or 5. 103-12 IEs also do not complete 4j and 4l. MTIAs also do not complete 4l. a b c d During the plan year: Yes No Amount Was there a failure to transmit to the plan any participant contributions within the time period described in 29 CFR 2510.3-102? Continue to answer Yes for any prior year failures until fully corrected. (See instructions and DOL s Voluntary Fiduciary Correction Program.)... 4a X óïîíìëêéèçðïîíìë Were any loans by the plan or fixed income obligations due the plan in default as of the close of the plan year or classified during the year as uncollectible? Disregard participant loans secured by participant s account balance. (Attach Schedule G (Form 5500) Part I if Yes is checked.)... 4b X óïîíìëêéèçðïîíìë Were any leases to which the plan was a party in default or classified during the year as uncollectible? (Attach Schedule G (Form 5500) Part II if Yes is checked.)... 4c X óïîíìëêéèçðïîíìë Were there any nonexempt transactions with any party-in-interest? (Do not include transactions reported on line 4a. Attach Schedule G (Form 5500) Part III if Yes is checked.)... 4d X óïîíìëêéèçðïîíìë e Was this plan covered by a fidelity bond?... 4e X óïîíìëêéèçðïîíìë 15,000,000 f Did the plan have a loss, whether or not reimbursed by the plan s fidelity bond, that was caused X g h i j by fraud or dishonesty?... 4f óïîíìëêéèçðïîíìë Did the plan hold any assets whose current value was neither readily determinable on an established market nor set by an independent third party appraiser?... 4g X óïîíìëêéèçðïîíìë Did the plan receive any noncash contributions whose value was neither readily determinable on an established market nor set by an independent third party appraiser?... Did the plan have assets held for investment? (Attach schedule(s) of assets if Yes is checked, and see instructions for format requirements.)... Were any plan transactions or series of transactions in excess of 5% of the current value of plan assets? (Attach schedule of transactions if Yes is checked, and see instructions for format requirements.)... 4h 4i 4j óïîíìëêéèçðïîíìë k Were all the plan assets either distributed to participants or beneficiaries, transferred to another plan, or brought under the control of the PBGC?... 4k X l Has the plan failed to provide any benefit when due under the plan?... 4l X óïîíìëêéèçðïîíìë m X n 5a 5b If this is an individual account plan, was there a blackout period? (See instructions and 29 CFR 2520.101-3.)... 4m If 4m was answered Yes, check the Yes box if you either provided the required notice or one of the exceptions to providing the notice applied under 29 CFR 2520.101-3.... Has a resolution to terminate the plan been adopted during the plan year or any prior plan year? If yes, enter the amount of any plan assets that reverted to the employer this year... È Yes ÈX No Amount: óïîíìëêéèçðïîíìë If, during this plan year, any assets or liabilities were transferred from this plan to another plan(s), identify the plan(s) to which assets or liabilities were transferred. (See instructions.) 5b(1) Name of plan(s) 5b(2) EIN(s) 5b(3) PN(s) 4n X X X ïîíìëêéèç ïîíìëêéèç ïîíìëêéèç ïîíìëêéèç ïîí ïîí ïîí ïîí

5500 Supplemental Schedules 31 DEC 10 Schedule of Assets Held for Investment Purposes Account number 2250876 Account Name USEC - HQ PLAN Page 9 of 19 Security Description / Asset ID Shares/Par Value Historical Cost Current Value Value of Interest in Common/Collective Trusts United States - USD CF FRANK RUSSELL EQTY FD I CUSIP: 781991CF9 CF RUSSELL EMERGING MARKETS FD CUSIP: 134996719 CF RUSSELL EQTY II FD CUSIP: 352996CF7 CF RUSSELL INTL FD CUSIP: 352992CF6 CF RUSSELL MULTI MGR BD FD CUSIP: G3657R996 CF RUSSELL WORLD EQUITY FD CUSIP: 134996727 COLTV SHORT TERM INVT FD CUSIP: 195998AD1 211,120.66 9,031,910.14 9,872,002.06 5,060.38 388,535.33 404,172.55 47,270.69 2,428,883.24 3,075,903.79 73,735.25 3,289,789.67 3,345,368.29 508,988.27 6,595,475.41 7,746,801.46 290,263.05 2,734,277.93 2,856,188.41 275,893.85 275,893.85 275,893.85 Total United States - USD 24,744,765.57 27,576,330.41 Total Value of Interest in Common/Collective Trusts 24,744,765.57 27,576,330.41 Total 24,744,765.57 27,576,330.41 ** All or a portion of this security participates in Securities Lending. Northern Trust - Dol Generated by Northern Trust from reviewed periodic data on 14 Apr 11

5500 Supplemental Schedules 1 JAN 10-31 DEC 10 5% Report - Part A Account number 2250876 Account Name USEC - HQ PLAN Page 4 of 19 Single Transaction in Excess of 5% Acquisition Disposition Lease Expenses Current Value on Security Description / Asset ID Shares/Par Value Date Price Price Rental Incurred Cost Transaction Date Net Gain/Loss Value of Interest in Common/Collective Trusts United States - USD CF FRANK RUSSELL EQTY FD I CUSIP: 781991CF9-64,041.13 21 Oct 10 43.19 0.00 2,739,730.20 2,765,936.38 26,206.18 CF RUSSELL WORLD EQUITY FD CUSIP: 134996727 293,623.82 21 Oct 10 9.42 0.00 2,765,936.38 2,765,936.38 0.00 NOTE: TRANSACTIONS ARE BASED ON THE 2009-12-31 VALUE (INCLUDING ACCRUALS) OF 25,062,843.16 Northern Trust - Dol Generated by Northern Trust from reviewed periodic data on 14 Apr 11

5500 Supplemental Schedules 1 JAN 10-31 DEC 10 5% Report - Part B Account number 2250876 Account Name USEC - HQ PLAN Page 5 of 19 Series of Non-Security Transactions with Same Party in Excess of 5% Acquisition Disposition Lease Expenses Current Value on Security Description / Asset ID Shares/Par Value Date Price Price Rental Incurred Cost Transaction Date Net Gain/Loss THERE ARE NO REPORTABLE TRANSACTIONS NOTE: TRANSACTIONS ARE BASED ON THE 2009-12-31 VALUE (INCLUDING ACCRUALS) OF 25,062,843.16 Northern Trust - Dol Generated by Northern Trust from reviewed periodic data on 14 Apr 11

5500 Supplemental Schedules 1 JAN 10-31 DEC 10 5% Report - Part C Summary Account number 2250876 Account Name USEC - HQ PLAN Page 6 of 19 Series of Transactions by Issue in Excess of 5% Number of Transaction Aggregate Lease Expenses Current Value of Asset Security Description / Asset ID Transactions Acquisition Price Disposition Price Rental Incurred Cost of Asset on Transaction CF FRANK RUSSELL EQTY FD I CUSIP: 781991CF9 Total acquisitions 1 270,377.77 0.00 270,377.77 270.377.77 Total dispositions 6 3,071,457.29 0.00 3,042,276.30 3,071.457.29 CF RUSSELL MULTI MGR BD FD CUSIP: G3657R996 Total acquisitions 2 517,701.67 0.00 517,701.67 517.701.67 Total dispositions 6 947,414.67 0.00 814,595.29 947.414.67 CF RUSSELL WORLD EQUITY FD CUSIP: 134996727 Total acquisitions 1 2,765,936.38 0.00 2,765,936.38 2,765.936.38 Total dispositions 1 31,826.52 0.00 31,658.45 31.826.52 COLTV SHORT TERM INVT FD CUSIP: 195998AD1 Total acquisitions 14 774,121.00 0.00 774,121.00 774.121.00 Total dispositions 35 861,063.20 0.00 861,063.20 861.063.20 NOTE: TRANSACTIONS ARE BASED ON THE 2009-12-31 VALUE (INCLUDING ACCRUALS) OF 25,062,843.16 Northern Trust - Dol Generated by Northern Trust from reviewed periodic data on 14 Apr 11

5500 Supplemental Schedules 1 JAN 10-31 DEC 10 5% Report - Part D Account number 2250876 Account Name USEC - HQ PLAN Page 7 of 19 Series of Transactions with Same Party in Excess of 5% Acquisition Disposition Lease Expenses Current Value on Security Description / Asset ID Shares/Par Value Date Price Price Rental Incurred Cost Transaction Date Net Gain/Loss THERE ARE NO REPORTABLE TRANSACTIONS NOTE: TRANSACTIONS ARE BASED ON THE 2009-12-31 VALUE (INCLUDING ACCRUALS) OF 25,062,843.16 Northern Trust - Dol Generated by Northern Trust from reviewed periodic data on 14 Apr 11