

<!--XBRL document created with Crossfire by Rivet Software version 5.3.143.0 http://www.rivetsoftware.com-->
<!--Based on XBRL 2.1-->
<!--Created on: 11/1/2012 12:37:34 PM-->
<!--Modified on: 11/1/2012 12:37:34 PM-->
<xs:schema targetNamespace="http://usec.com/20120930" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:usu="http://usec.com/20120930" xmlns:us-types="http://fasb.org/us-types/2012-01-31">
  <xs:annotation>
    <xs:appinfo>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/StatementConsolidatedCondensedBalanceSheets" id="StatementConsolidatedCondensedBalanceSheets">
        <link:definition>00100 - Statement - CONSOLIDATED CONDENSED BALANCE SHEETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/StatementConsolidatedCondensedStatementsOfOperations" id="StatementConsolidatedCondensedStatementsOfOperations">
        <link:definition>00200 - Statement - CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/StatementConsolidatedCondensedStatementsOfComprehensiveIncomeLoss" id="StatementConsolidatedCondensedStatementsOfComprehensiveIncomeLoss">
        <link:definition>00250 - Statement - CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/StatementConsolidatedCondensedStatementsOfCashFlows" id="StatementConsolidatedCondensedStatementsOfCashFlows">
        <link:definition>00300 - Statement - CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureAccountsReceivableTableDetails" id="DisclosureAccountsReceivableTableDetails">
        <link:definition>40202 - Disclosure - Accounts Receivable (Table) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureInventoriesTableDetails" id="DisclosureInventoriesTableDetails">
        <link:definition>40302 - Disclosure - Inventories (Table) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureDeferredRevenueAndAdvancesFromCustomersDeferredRevenueAndAdvancesFromCustomersDetails" id="DisclosureDeferredRevenueAndAdvancesFromCustomersDeferredRevenueAndAdvancesFromCustomersDetails">
        <link:definition>40502 - Disclosure - Deferred Revenue and Advances from Customers (Deferred Revenue and Advances From Customers) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosurePensionAndPostretirementHealthAndLifeBenefitsScheduleOfNetBenefitCostsDetails" id="DisclosurePensionAndPostretirementHealthAndLifeBenefitsScheduleOfNetBenefitCostsDetails">
        <link:definition>40803 - Disclosure - Pension and Postretirement Health and Life Benefits (Schedule of Net Benefit Costs) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureStockBasedCompensationStockBasedCompensationCostsDetails" id="DisclosureStockBasedCompensationStockBasedCompensationCostsDetails">
        <link:definition>40902 - Disclosure - Stock-Based Compensation (Stock-Based Compensation Costs) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureSegmentInformationSegmentReportingInformationDetails" id="DisclosureSegmentInformationSegmentReportingInformationDetails">
        <link:definition>41302 - Disclosure - Segment Information (Segment Reporting Information) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DocumentDocumentAndEntityInformation" id="DocumentDocumentAndEntityInformation">
        <link:definition>00090 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/StatementConsolidatedCondensedStatementsOfStockholdersEquity" id="StatementConsolidatedCondensedStatementsOfStockholdersEquity">
        <link:definition>00400 - Statement - CONSOLIDATED CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureBasisOfPresentation" id="DisclosureBasisOfPresentation">
        <link:definition>10101 - Disclosure - Basis of Presentation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureAccountsReceivable" id="DisclosureAccountsReceivable">
        <link:definition>10201 - Disclosure - Accounts Receivable</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureInventories" id="DisclosureInventories">
        <link:definition>10301 - Disclosure - Inventories</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosurePropertyPlantAndEquipment" id="DisclosurePropertyPlantAndEquipment">
        <link:definition>10401 - Disclosure - Property, Plant and Equipment</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureDeferredRevenueAndAdvancesFromCustomers" id="DisclosureDeferredRevenueAndAdvancesFromCustomers">
        <link:definition>10501 - Disclosure - Deferred Revenue and Advances From Customers</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureDebt" id="DisclosureDebt">
        <link:definition>10601 - Disclosure - Debt</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureFairValueMeasurements" id="DisclosureFairValueMeasurements">
        <link:definition>10701 - Disclosure - Fair Value Measurements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosurePensionAndPostretirementHealthAndLifeBenefits" id="DisclosurePensionAndPostretirementHealthAndLifeBenefits">
        <link:definition>10801 - Disclosure - Pension and Postretirement Health and Life Benefits</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureStockBasedCompensation" id="DisclosureStockBasedCompensation">
        <link:definition>10901 - Disclosure - Stock-Based Compensation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureNetIncomePerShare" id="DisclosureNetIncomePerShare">
        <link:definition>11001 - Disclosure - Net Income Per Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureWorkforceReductionAndAdvisoryCosts" id="DisclosureWorkforceReductionAndAdvisoryCosts">
        <link:definition>11101 - Disclosure - Workforce Reduction and Advisory Costs</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureCommitmentsAndContingencies" id="DisclosureCommitmentsAndContingencies">
        <link:definition>11201 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureSegmentInformation" id="DisclosureSegmentInformation">
        <link:definition>11301 - Disclosure - Segment Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureAccountsReceivableTables" id="DisclosureAccountsReceivableTables">
        <link:definition>30203 - Disclosure - Accounts Receivable (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureInventoriesTables" id="DisclosureInventoriesTables">
        <link:definition>30303 - Disclosure - Inventories (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosurePropertyPlantAndEquipmentTables" id="DisclosurePropertyPlantAndEquipmentTables">
        <link:definition>30403 - Disclosure - Property, Plant and Equipment (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureDeferredRevenueAndAdvancesFromCustomersTables" id="DisclosureDeferredRevenueAndAdvancesFromCustomersTables">
        <link:definition>30503 - Disclosure - Deferred Revenue and Advances From Customers (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureDebtTables" id="DisclosureDebtTables">
        <link:definition>30603 - Disclosure - Debt (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureFairValueMeasurementsTables" id="DisclosureFairValueMeasurementsTables">
        <link:definition>30703 - Disclosure - Fair Value Measurements (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosurePensionAndPostretirementHealthAndLifeBenefitsTables" id="DisclosurePensionAndPostretirementHealthAndLifeBenefitsTables">
        <link:definition>30803 - Disclosure - Pension and Postretirement Health and Life Benefits (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureStockBasedCompensationTables" id="DisclosureStockBasedCompensationTables">
        <link:definition>30903 - Disclosure - Stock-Based Compensation (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureNetIncomePerShareTables" id="DisclosureNetIncomePerShareTables">
        <link:definition>31003 - Disclosure - Net Income Per Share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureSegmentInformationTables" id="DisclosureSegmentInformationTables">
        <link:definition>31303 - Disclosure - Segment Information (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureAccountsReceivableNarrativeDetails" id="DisclosureAccountsReceivableNarrativeDetails">
        <link:definition>40201 - Disclosure - Accounts Receivable (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureInventoriesNarrativeDetails" id="DisclosureInventoriesNarrativeDetails">
        <link:definition>40301 - Disclosure - Inventories (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosurePropertyPlantAndEquipmentNarrativeDetails" id="DisclosurePropertyPlantAndEquipmentNarrativeDetails">
        <link:definition>40401 - Disclosure - Property, Plant and Equipment (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosurePropertyPlantAndEquipmentSummaryOfChangesInPropertyPlantAndEquipmentDetails" id="DisclosurePropertyPlantAndEquipmentSummaryOfChangesInPropertyPlantAndEquipmentDetails">
        <link:definition>40402 - Disclosure - Property, Plant and Equipment (Summary of Changes in Property, Plant and Equipment) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureDeferredRevenueAndAdvancesFromCustomersNarrativeDetails" id="DisclosureDeferredRevenueAndAdvancesFromCustomersNarrativeDetails">
        <link:definition>40501 - Disclosure - Deferred Revenue and Advances from Customers (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureDebtNarrativeDetails" id="DisclosureDebtNarrativeDetails">
        <link:definition>40601 - Disclosure - Debt (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureDebtScheduleOfRevolvingCreditFacilityDetails" id="DisclosureDebtScheduleOfRevolvingCreditFacilityDetails">
        <link:definition>40602 - Disclosure - Debt (Schedule of Revolving Credit Facility) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureDebtScheduleOfDeferredFinancingCostsDetails" id="DisclosureDebtScheduleOfDeferredFinancingCostsDetails">
        <link:definition>40603 - Disclosure - Debt (Schedule of Deferred Financing Costs) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureFairValueMeasurementsFinancialInstrumentsRecordedAtFairValueDetails" id="DisclosureFairValueMeasurementsFinancialInstrumentsRecordedAtFairValueDetails">
        <link:definition>40701 - Disclosure - Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureFairValueMeasurementsDebtDetails" id="DisclosureFairValueMeasurementsDebtDetails">
        <link:definition>40703 - Disclosure - Fair Value Measurements (Debt) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureFairValueMeasurementsNarrativeDetails" id="DisclosureFairValueMeasurementsNarrativeDetails">
        <link:definition>40704 - Disclosure - Fair Value Measurements (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosurePensionAndPostretirementHealthAndLifeBenefitsNarrativeDetails" id="DisclosurePensionAndPostretirementHealthAndLifeBenefitsNarrativeDetails">
        <link:definition>40801 - Disclosure - Pension and Postretirement Health and Life Benefits (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureStockBasedCompensationNarrativeDetails" id="DisclosureStockBasedCompensationNarrativeDetails">
        <link:definition>40901 - Disclosure - Stock-Based Compensation (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureNetIncomePerShareNarrativeDetails" id="DisclosureNetIncomePerShareNarrativeDetails">
        <link:definition>41001 - Disclosure - Net Income Per Share (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureNetIncomePerShareScheduleOfIncomePerShareDetails" id="DisclosureNetIncomePerShareScheduleOfIncomePerShareDetails">
        <link:definition>41002 - Disclosure - Net Income Per Share (Schedule of Income Per Share) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureNetIncomePerShareOptionsAndWarrantsExcludedFromCalculationDetails" id="DisclosureNetIncomePerShareOptionsAndWarrantsExcludedFromCalculationDetails">
        <link:definition>41003 - Disclosure - Net Income Per Share (Options and Warrants Excluded From the Calculation) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureWorkforceReductionsNarrativeDetails" id="DisclosureWorkforceReductionsNarrativeDetails">
        <link:definition>41103 - Disclosure - Workforce Reductions (Narrative)(Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureCommitmentAndContingenciesDetails" id="DisclosureCommitmentAndContingenciesDetails">
        <link:definition>41201 - Disclosure - Commitment and Contingencies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://usec.com/2010-09-30/role/DisclosureSegmentInformationNarrativeDetails" id="DisclosureSegmentInformationNarrativeDetails">
        <link:definition>41304 - Disclosure - Segment Information (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:linkbaseRef xlink:type="simple" xlink:href="usu-20120930_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="usu-20120930_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="usu-20120930_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="usu-20120930_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Definition Links, all" />
    </xs:appinfo>
  </xs:annotation>
  <xs:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <import namespace="http://xbrl.sec.gov/dei/2012-01-31" schemaLocation="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd" xmlns="http://www.w3.org/2001/XMLSchema" />
  <import namespace="http://xbrl.sec.gov/invest/2012-01-31" schemaLocation="http://xbrl.sec.gov/invest/2012/invest-2012-01-31.xsd" xmlns="http://www.w3.org/2001/XMLSchema" />
  <import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" xmlns="http://www.w3.org/2001/XMLSchema" />
  <import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" xmlns="http://www.w3.org/2001/XMLSchema" />
  <import namespace="http://fasb.org/us-gaap/2012-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_InventoriesOwedToCustomersAndSuppliers" name="InventoriesOwedToCustomersAndSuppliers" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_SeparativeWorkUnits" name="SeparativeWorkUnits" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_Uranium" name="Uranium" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_InventoryNetOfLiability" name="InventoryNetOfLiability" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_UnrecognizedCompensationCostRestrictedStock" name="UnrecognizedCompensationCostRestrictedStock" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_UnrecognizedCompensationCostStockOptions" name="UnrecognizedCompensationCostStockOptions" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_InterestExpenseIncomeAndIssuanceCostsNet" name="InterestExpenseIncomeAndIssuanceCostsNet" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_PropertyPlantAndEquipmentNetCapitalExpenditures" name="PropertyPlantAndEquipmentNetCapitalExpenditures" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_IntersegmentSalesBetweenReportableSegments" name="IntersegmentSalesBetweenReportableSegments" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_InventoriesProvidedByCustomersAndSuppliers" name="InventoriesProvidedByCustomersAndSuppliers" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_GrossProfitFromLowEnrichedUraniumSegment" name="GrossProfitFromLowEnrichedUraniumSegment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_ContractsGrossProfit" name="ContractsGrossProfit" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_LineOfCreditFacilityLettersOfCreditCapacity" name="LineOfCreditFacilityLettersOfCreditCapacity" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_LineOfCreditFacilityTermLoanFacility" name="LineOfCreditFacilityTermLoanFacility" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_FairValueOfDebtTableTextBlock" name="FairValueOfDebtTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_ScheduleOfSecuritiesExcludedFromEarningsPerShare" name="ScheduleOfSecuritiesExcludedFromEarningsPerShare" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_UtilityCustomerReceivables" name="UtilityCustomerReceivables" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_ContractServicesBilledRevenue" name="ContractServicesBilledRevenue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_ContractServicesUnbilledRevenue" name="ContractServicesUnbilledRevenue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_ContractServicesCustomerReceivables" name="ContractServicesCustomerReceivables" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_DeclineInUraniumSpotPriceIndicator" name="DeclineInUraniumSpotPriceIndicator" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_DeclineInUraniumQuantitiesProvidedByCustomersAndSuppliers" name="DeclineInUraniumQuantitiesProvidedByCustomersAndSuppliers" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_AccumulatedDepreciationAndAmortizationDepreciation" name="AccumulatedDepreciationAndAmortizationDepreciation" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_CapitalExpendituresForAmericanCentrifugeProject" name="CapitalExpendituresForAmericanCentrifugeProject" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_CapitalizedAssetRetirementObligations" name="CapitalizedAssetRetirementObligations" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_DocumentAndEntityInformation" name="DocumentAndEntityInformation" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_AmountOfApplicationUnderDoeLoanGuaranteeProgram" name="AmountOfApplicationUnderDoeLoanGuaranteeProgram" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_PotentialFinancingFromExportCreditAgenciesUnderDiscussion" name="PotentialFinancingFromExportCreditAgenciesUnderDiscussion" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_GainOnExtingusihmentOfDebt" name="GainOnExtingusihmentOfDebt" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_UpperRangeOfPotentialAcpAssetImpairmentExpense" name="UpperRangeOfPotentialAcpAssetImpairmentExpense" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_TotalCommonSharesAttributableToConversionOfDebtSecurities" name="TotalCommonSharesAttributableToConversionOfDebtSecurities" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_UnallowableCommonSharesAttributableToConversionOfDebtSecurities" name="UnallowableCommonSharesAttributableToConversionOfDebtSecurities" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_OptionsWithExercisePriceGreaterThanMarketPrice" name="OptionsWithExercisePriceGreaterThanMarketPrice" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_WarrantsWithExercisePriceGreaterThanMarketPrice" name="WarrantsWithExercisePriceGreaterThanMarketPrice" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_UnadjustedWeightedAverageEffectOfDilutiveSecurities" name="UnadjustedWeightedAverageEffectOfDilutiveSecurities" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_SummaryOfDeferredFinancingCosts" name="SummaryOfDeferredFinancingCosts" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_RevenueFromLowEnrichedUraniumSegment" name="RevenueFromLowEnrichedUraniumSegment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_CreditFacilityAmendedAndRestatedMember" name="CreditFacilityAmendedAndRestatedMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_BankCreditFacilitiesMember" name="BankCreditFacilitiesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_ConvertibleNotesMember" name="ConvertibleNotesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_DoeLoanGuaranteeApplicationMember" name="DoeLoanGuaranteeApplicationMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_DeferredFinancingCostsMember" name="DeferredFinancingCostsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_DeferredFinancingCostsAdditions" name="DeferredFinancingCostsAdditions" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_DeferredFinancingCostsAmortization" name="DeferredFinancingCostsAmortization" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_SeparativeWorkUnitsInventory" name="SeparativeWorkUnitsInventory" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_UraniumInventory" name="UraniumInventory" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_IncomeLossBeforeIncomeTaxesAllSegments" name="IncomeLossBeforeIncomeTaxesAllSegments" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_GrossProfitsAllSegments" name="GrossProfitsAllSegments" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_OperatingIncomeLossAllSegments" name="OperatingIncomeLossAllSegments" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_MinimumPowerPurchaseObligation" name="MinimumPowerPurchaseObligation" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_SeparativeWorkUnitsOwedToCustomersAndSuppliers" name="SeparativeWorkUnitsOwedToCustomersAndSuppliers" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_UraniumOwedToCustomersAndSuppliers" name="UraniumOwedToCustomersAndSuppliers" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_SeparativeWorkUnitsNetOfLiability" name="SeparativeWorkUnitsNetOfLiability" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_UraniumInventoryNetOfLiability" name="UraniumInventoryNetOfLiability" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_DoeContractServicesMember" name="DoeContractServicesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_DoeAdvancedTechnologyMember" name="DoeAdvancedTechnologyMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_QualifyingExpendituresForRdDProgram" name="QualifyingExpendituresForRdDProgram" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_MaximumRoyaltyUnderCommercialCentrifugeIpLicense" name="MaximumRoyaltyUnderCommercialCentrifugeIpLicense" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_TotalEstimatedCostOfRdDProgram" name="TotalEstimatedCostOfRdDProgram" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_DoeShareOfRdDProgram" name="DoeShareOfRdDProgram" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_UsecShareOfRdDProgram" name="UsecShareOfRdDProgram" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_DoeInitialFundingOfRdDProgram" name="DoeInitialFundingOfRdDProgram" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_ExpectedDefinedBenefitPlanContributionsForCurrentFiscalYearUnderErisa" name="ExpectedDefinedBenefitPlanContributionsForCurrentFiscalYearUnderErisa" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_ExpectedDefinedBenefitPlanContributionsForCurrentFiscalYearForNonQualifiedPlans" name="ExpectedDefinedBenefitPlanContributionsForCurrentFiscalYearForNonQualifiedPlans" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_EstimatedReductionInDefinedBenefitPlanContributionsForCurrentFiscalYearDueToMap21" name="EstimatedReductionInDefinedBenefitPlanContributionsForCurrentFiscalYearDueToMap21" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_NetDefinedBenefitPlanCostsForFormerPortsmouthEmployees" name="NetDefinedBenefitPlanCostsForFormerPortsmouthEmployees" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_MonthlyReductionInCreditFacilityEffectiveDecember2012" name="MonthlyReductionInCreditFacilityEffectiveDecember2012" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_MaximumUsecShareForRdDProgramUnderCreditFacility" name="MaximumUsecShareForRdDProgramUnderCreditFacility" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_MaximumAggregateAmericanCentrifugeExpendituresAfterJune12012UnderCreditFacility" name="MaximumAggregateAmericanCentrifugeExpendituresAfterJune12012UnderCreditFacility" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_AvailabilityBlock" name="AvailabilityBlock" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_MaximumUnreimbursedExpendituresUnderCreditFacility" name="MaximumUnreimbursedExpendituresUnderCreditFacility" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_DoeInitialRdDProgramFunding" name="DoeInitialRdDProgramFunding" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_TransferFromCwipToDepreciatingAssets" name="TransferFromCwipToDepreciatingAssets" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_TransferFromPrepaidAssetsToDepreciatingAssets" name="TransferFromPrepaidAssetsToDepreciatingAssets" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_PreviouslyCapitalizedCwipExpensed" name="PreviouslyCapitalizedCwipExpensed" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_CashCollateralDepositsReceived" name="CashCollateralDepositsReceived" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_CashCollateralDepositsExpectedToBeReceived" name="CashCollateralDepositsExpectedToBeReceived" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_OptionalCashCollateral" name="OptionalCashCollateral" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_RdDProgramFundingExpectedInNextSixMonths" name="RdDProgramFundingExpectedInNextSixMonths" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_PotentialErisaSection4062EPensionLiabililty" name="PotentialErisaSection4062EPensionLiabililty" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_AnnualRateOfRdDProgramFundingApprovedByGovernment" name="AnnualRateOfRdDProgramFundingApprovedByGovernment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
</xs:schema>