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  <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_ExpensedCentrifugeMachines" name="ExpensedCentrifugeMachines" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_PaidInKindDividendsPayableBeginningBalance" name="PaidInKindDividendsPayableBeginningBalance" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_PaidInKindDividendsPayable" name="PaidInKindDividendsPayable" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" 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_MaximumPotentialSeveranceLiability" name="MaximumPotentialSeveranceLiability" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_MaximumPotentialSeveranceLiabilitySharedByOthers" name="MaximumPotentialSeveranceLiabilitySharedByOthers" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_AcpSpendingReductionInOctober2011" name="AcpSpendingReductionInOctober2011" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" 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_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_AdjustedWeightedAverageEffectOfDilutiveSecurities" name="AdjustedWeightedAverageEffectOfDilutiveSecurities" 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_ScheduleOfFairValueOfPensionPlanAssets" name="ScheduleOfFairValueOfPensionPlanAssets" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_ScheduleOfFairValueOfPostretirementBenefitPlanAssets" name="ScheduleOfFairValueOfPostretirementBenefitPlanAssets" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_LeuSegmentAssets" name="LeuSegmentAssets" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_ContractServicesSegmentAssets" name="ContractServicesSegmentAssets" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_RevenueUnitedStates" name="RevenueUnitedStates" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_RevenueJapan" name="RevenueJapan" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_RevenueOtherCountries" name="RevenueOtherCountries" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_RevenueForeign" name="RevenueForeign" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" 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_CompensationAndBenefitsPayable" name="CompensationAndBenefitsPayable" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_AmericanCentrifugeAccruedLiabilities" name="AmericanCentrifugeAccruedLiabilities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_AccruedPropertyAndOtherTaxesPayable" name="AccruedPropertyAndOtherTaxesPayable" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_AccruedLeaseTurnoverCurrent" name="AccruedLeaseTurnoverCurrent" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" 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_ScheduleOfEstimatedFutureBenefitPayments" name="ScheduleOfEstimatedFutureBenefitPayments" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_CollectiveTrustMoneyMarketFunds" name="CollectiveTrustMoneyMarketFunds" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_CollectiveTrustBondFunds" name="CollectiveTrustBondFunds" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_CollectiveTrustEquityFunds" name="CollectiveTrustEquityFunds" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_PreferredEquity" name="PreferredEquity" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_CorporateBonds" name="CorporateBonds" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_MunicipalBonds" name="MunicipalBonds" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_MortgageAndAssetBackedSecurities" name="MortgageAndAssetBackedSecurities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_FairValueOfInvestmentsByHierarchyLevel" name="FairValueOfInvestmentsByHierarchyLevel" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_AccruedInterestReceivable" name="AccruedInterestReceivable" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_UnsettledTransactionsReceivable" name="UnsettledTransactionsReceivable" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_AmortizationOfActuarialGainsLossesNet" name="AmortizationOfActuarialGainsLossesNet" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_AmountsRecognizedInCurrentLiabilities" name="AmountsRecognizedInCurrentLiabilities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_AmountsRecognizedInNoncurrentLiabilities" name="AmountsRecognizedInNoncurrentLiabilities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_AmountsRecognizedInAccumulatedOtherComprehensiveIncomePreTaxNetActuarialLoss" name="AmountsRecognizedInAccumulatedOtherComprehensiveIncomePreTaxNetActuarialLoss" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_AmountsRecognizedInAccumulatedOtherComprehensiveIncomePreTaxPriorServiceCostCredit" name="AmountsRecognizedInAccumulatedOtherComprehensiveIncomePreTaxPriorServiceCostCredit" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_AmountsRecognizedInAccumulatedOtherComprehensiveIncomePreTax" name="AmountsRecognizedInAccumulatedOtherComprehensiveIncomePreTax" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_RestrictedSharesUnvested" name="RestrictedSharesUnvested" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_RestrictedSharesVested" name="RestrictedSharesVested" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_RestrictedStockWeightedAverageGrantDateFairValueBeginning" name="RestrictedStockWeightedAverageGrantDateFairValueBeginning" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_RestrictedStockWeightedAverageGrantDateFairValueGranted" name="RestrictedStockWeightedAverageGrantDateFairValueGranted" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_RestrictedStockWeightedAverageGrantDateFairValueVested" name="RestrictedStockWeightedAverageGrantDateFairValueVested" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_RestrictedStockWeightedAverageGrantDateFairValueEnding" name="RestrictedStockWeightedAverageGrantDateFairValueEnding" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_DeferredTaxAssetsPropertyPlantAndEquipment" name="DeferredTaxAssetsPropertyPlantAndEquipment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_DeferredTaxAssetsTaxIntangibles" name="DeferredTaxAssetsTaxIntangibles" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" 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_PrepaymentsToAmericanCentrifugeSuppliers" name="PrepaymentsToAmericanCentrifugeSuppliers" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_PaidInKindDividendsIssued" name="PaidInKindDividendsIssued" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_ExpensedPreviouslyCapitalizedPrepayments" name="ExpensedPreviouslyCapitalizedPrepayments" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_InterimRdDFunding" name="InterimRdDFunding" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_CreditAgreementMaturing2013Member" name="CreditAgreementMaturing2013Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_RevolvingCreditFacilityCapacity" name="RevolvingCreditFacilityCapacity" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_TermLoanFunded" name="TermLoanFunded" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_RevolvingCommitmentMonthlyReduction" name="RevolvingCommitmentMonthlyReduction" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_ScheduleOfAssetsBySegment" name="ScheduleOfAssetsBySegment" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" 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_MaximumDoeRdDProgramContribution" name="MaximumDoeRdDProgramContribution" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_FinancialAssurance" name="FinancialAssurance" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_AccruedLiabilitiesForStoredWastes" name="AccruedLiabilitiesForStoredWastes" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_AccruedLiabilitiesForLeaseTurnoverCosts" name="AccruedLiabilitiesForLeaseTurnoverCosts" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="usu_BenefitsPaid" name="BenefitsPaid" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
</xs:schema>