Common use of Ratification of Guarantees Clause in Contracts

Ratification of Guarantees. Each of the undersigned Guarantors hereby acknowledges and consents to the foregoing First Amendment to Amended and Restated Revolving Credit Agreement dated as of March 6, 2006 (the “First Amendment”) among USEC Inc. (“Holdings”), United States Enrichment Corporation (“Enrichment” and, together with Holdings, the “Borrowers”), the Lenders party thereto, JPMorgan Chase Bank, N.A., as administrative agent and collateral agent (the “Administrative Agent”), and the other financial institutions named therein as “agents”, confirms that the obligations of the Borrowers under the Credit Agreement, as amended by the First Amendment, constitute “Guaranteed Obligations” guarantied by and entitled to the benefits of each respective Amended and Restated Guarantee dated as of August 18, 2005 executed and delivered by each such Guarantor to the Administrative Agent, the Issuing Bank, the Lenders and the other Secured Parties (each a “Guarantee” and collectively, the “Guarantees”), agrees that its respective Guarantee remains in full force and effect and ratifies and confirms all of its obligations thereunder. Capitalized terms used but not otherwise defined herein shall have the meanings attributed to them in the Guarantees. NAC HOLDING INC. By: /s/ P▇▇▇▇ ▇▇▇▇▇▇ Name: Title: P▇▇▇▇ ▇▇▇▇▇▇ President NAC INTERNATIONAL INC. By: /s/ P▇▇▇▇ ▇▇▇▇▇▇ Name: Title: P▇▇▇▇ ▇▇▇▇▇▇ President This FIRST AMENDMENT TO SECURITY AGREEMENT dated as of March 6th, 2006 (this “Amendment”), is made by UNITED STATES ENRICHMENT CORPORATION, a Delaware corporation (the “Company”), USEC INC., a Delaware corporation (“Parent”) and, together with the Company, “USEC”), and the UNITED STATES DEPARTMENT OF ENERGY (“DOE”) amends the Security Agreement dated as of February 2, 2005 (as amended, the “Security Agreement”), by USEC in favor of DOE.

Ratification of Guarantees. Each of the undersigned Guarantors hereby acknowledges and consents to the foregoing First Third Amendment to Amended and Restated Revolving Credit Agreement dated as of March 6September 21, 2006 2007 (the “First Third Amendment”) among USEC Inc. (“Holdings”), United States Enrichment Corporation (“Enrichment” and, together with Holdings, the “Borrowers”), the Lenders party thereto, JPMorgan Chase Bank, N.A., as administrative agent and collateral agent (the “Administrative Agent”), and the other financial institutions named therein as “agents”, confirms that the obligations of the Borrowers under the Credit Agreement, as previously amended by that certain First Amendment to Amended and Restated Revolving Credit Agreement dated as of March 6, 2006, that certain Second Amendment to Amended and Restated Revolving Credit Agreement dates as of October 16, 2006, and as amended by the First Third Amendment, constitute “Guaranteed Obligations” guarantied by and entitled to the benefits of each respective Amended and Restated Guarantee dated as of August 18, 2005 executed and delivered by each such Guarantor to the Administrative Agent, the Issuing Isssuing Bank, the Lenders and the other Secured Parties (each a “Guarantee” and collectively, the “Guarantees”), agrees that its respective Guarantee remains in full force and effect and ratifies and confirms all of its obligations thereunder. Capitalized terms used but not otherwise defined herein shall have the meanings attributed to them in the Guarantees. NAC HOLDING INC. By: /s/ P▇▇▇▇ ▇▇▇▇▇▇ Name: Title: P▇▇▇▇ ▇▇▇▇▇▇ President NAC INTERNATIONAL INC. By: /s/ P▇▇▇▇ ▇▇▇▇▇▇ Name: Title: P▇▇▇▇ ▇▇▇▇▇▇ President This FIRST AMENDMENT TO SECURITY AGREEMENT dated as of March 6th, 2006 (this “Amendment”), is made by UNITED STATES ENRICHMENT CORPORATION, a Delaware corporation (the “Company”), USEC INC., a Delaware corporation (“Parent”) and, together with the Company, “USEC”), and the UNITED STATES DEPARTMENT OF ENERGY (“DOE”) amends the Security Agreement dated as of February 2, 2005 (as amended, the “Security Agreement”), by USEC in favor of DOE.