Document:

EX-10.84

EXHIBIT 10.84

AMENDED AND RESTATED OMNIBUS PLEDGE AND SECURITY AGREEMENT

THIS AMENDED AND RESTATED PLEDGE AND SECURITY AGREEMENT, dated as of the 18th day of August,
2005 (together with all Exhibits, Annexes and schedules hereto, as the same may from time to time
be amended, modified, supplemented or restated in accordance with the terms hereof, this
“Agreement”), is made by USEC Inc., a Delaware corporation (“Parent”), United
States Enrichment Corporation, a Delaware corporation and wholly-owned subsidiary of Parent
(“Enrichment” and, together with Parent, the “Borrowers”), NAC Holding Inc., a
Delaware corporation (“NAC Holding”), NAC International Inc., a Delaware corporation
(“NAC International”), and each direct or indirect subsidiary of the Parent that, after the
date hereof, executes an addendum hereto (a “Pledgor Addendum”) substantially in the form
of Exhibit E hereto (NAC Holding, NAC International and such subsidiaries, collectively the
“Guarantor Pledgors,” and together with the Borrowers, the “Pledgors”), in favor of
JPMORGAN CHASE BANK, N.A. (formerly known as JPMorgan Chase Bank), as administrative and collateral
agent for the lenders (collectively, the “Lenders”) party to the Credit Agreement referred
to below (in such capacity, the “Agent”), for the benefit of the Secured Parties (as
hereinafter defined). Capitalized terms used herein without definition shall have the meanings
given to them in the Credit Agreement referred to below.

RECITALS

A. Enrichment is a party to that certain Revolving Credit Agreement dated as of September 27,
2002, as amended (the “Existing Credit Agreement”), among Enrichment, as “Borrower”, each
of the financial institutions party thereto as “Lenders” thereunder (the “Existing
Lenders”), JPMorgan Chase Bank, N.A., as “Administrative Agent” thereunder, and the other
financial institutions named therein as “agents” thereunder.

B. Parent, NAC Holding and NAC International guaranteed the obligations of Enrichment under
the Existing Credit Agreement pursuant to the Holdings Guarantee dated as of September 27, 2002
executed and delivered by the Parent, the Guarantee dated as of December 17, 2004 executed and
delivered by NAC Holding (the “NAC Holding Guarantee”) and the Guarantee dated as of
December 17, 2004 executed and delivered by NAC International (the “NAC International
Guarantee” and, together with the NAC Holding Guarantee, the “Existing Subsidiary
Guarantees”).

C. In connection with the Existing Credit Agreement, the Pledgors and the Agent entered into
an Omnibus Pledge and Security Agreement dated as of September 27, 2002, as amended (the
“Existing Security Agreement”), pursuant to which the Pledgors granted to the Agent
security interests in the Collateral (as defined in the Existing Security Agreement) to secure the
obligations of the Pledgors under the Existing Credit Agreement and the other Financing Documents
(as defined in the Existing Credit Agreement).

D. Concurrently herewith, the Borrowers have entered into that certain Amended and Restated
Revolving Credit Agreement of even date herewith among the Borrowers, the Agent, the Lenders party
thereto, J.P. Morgan Securities, Inc., Merrill Lynch Capital and Goldman Sachs Credit Partners,
L.P., as Joint Book Managers and Joint Lead Arrangers, and the other financial institutions named
therein as “agents” (as amended, modified, restated or supplemented from time to time, the
“Credit Agreement”), which Credit Agreement amends and restates the Existing Credit
Agreement in its entirety, and, among other things, increases the aggregate amount of the lending
commitments of the Lenders thereunder and provides for the Parent and Enrichment to be joint and
several co-borrowers thereunder.

E. Concurrently herewith, each of NAC Holding and NAC International is executing and
delivering to the Agent an Amended and Restated Guarantee (as amended, modified, restated or
supplemented from time to time, the “Pledgor Guaranties” and each a “Pledgor
Guaranty”), pursuant to which the Existing Subsidiary Guarantees are being amended and restated
in their entirety and NAC Holding and NAC International are guaranteeing to the Secured Parties the
payment in full of the Secured Obligations of the Borrowers under the Credit Agreement and the
other Financing Documents.

F. It is a condition to the willingness of the Agent and the Lenders to enter into the Credit
Agreement and to extend credit to the Borrowers thereunder that the Pledgors shall have entered
into this Agreement pursuant to which the parties shall amend and restate the Existing Security
Agreement in its entirety and the Pledgors shall agree to secure the payment in full of the
obligations of the Pledgors under the Credit Agreement, the Pledgor Guaranties and the other
Financing Documents. The Secured Parties are relying on this Agreement in their decision to extend
credit to the Borrowers under the Credit Agreement, and would not enter into the Credit Agreement
without the execution and delivery of this Agreement by the Pledgors.

G. The Guarantor Pledgors will obtain benefits as a result of the extension of credit to the
Borrowers under the Credit Agreement, which benefits are hereby acknowledged and, accordingly,
desire to execute and deliver this Agreement.

NOW, THEREFORE, the Pledgors and the Agent hereby agree that the Existing Security Agreement
be, and it hereby is, amended and restated in its entirety by this Agreement, and the Pledgors and
the Agent hereby further agree as follows:

ARTICLE I

DEFINITIONS

1.1 Defined Terms. For purposes of this Agreement, in addition to the terms defined
elsewhere herein, the following terms shall have the meanings set forth below:

“Accounts” shall have the meaning ascribed thereto in the Uniform Commercial Code and
whether now owned or existing or hereafter acquired or arising.

“Bankruptcy Code” shall mean 11 U.S.C. Sections 101 et seq., as
amended from time to time, and any successor statute.

“Chattel Paper” shall have the meaning ascribed thereto in the Uniform Commercial Code
and whether now owned or existing or hereafter acquired or arising.

“Collateral” shall have the meaning given to such term in Section 2.1.

“Collateral Accounts” shall have the meaning given to such term in Section 6.3.

“Copyrights” shall mean, collectively, all of each Pledgor’s right, title and interest
in and to all United States copyrights (including any registrations and applications therefor and
all renewals and extensions thereof), now owned or existing or created or hereafter acquired or
arising; provided that “Copyrights” shall not include those items relating to advanced
enrichment technologies.

“Copyright Collateral” shall mean, collectively, all Copyrights and Copyright Licenses
to which any Pledgor is or hereafter becomes a party and all other general intangibles embodying,
incorporating, evidencing or otherwise relating or pertaining to any Copyright or Copyright
License, in each case whether now owned or existing or hereafter acquired or arising.

“Copyright License” shall mean any agreement now or hereafter in effect granting any
right to any third party under any of the Copyrights now or hereafter owned by any Pledgor or which
any Pledgor otherwise has the right to license, or granting any right to any Pledgor under any
property of the type described in the definition of Copyrights herein now or hereafter owned by any
third party, and all rights of any Pledgor under any such agreement.

“Deferred Interests” shall mean all (i) Copyright Collateral, (ii) Equity Interests in
Enrichment, (iii) Patent Collateral, (iv) Trademark Collateral and (v) Proceeds with respect to the
foregoing.

“Deferred Interests Triggering Event” shall have the meaning ascribed thereto in
Section 2.3(b).

“Deposit Account” shall have the meaning ascribed thereto in the Uniform Commercial
Code, including, without limitation, each deposit account of any Pledgor maintained with the Agent
or any other bank or depository institution, whether now owned or existing or hereafter acquired or
arising and including, without limitation, each concentration account and each Collateral Account,
together with all funds held from time to time therein and all certificates and instruments from
time to time representing, evidencing or deposited into any such account.

“Document” shall have the meaning ascribed thereto in the Uniform Commercial Code.

“DOE Collateral” shall have the meaning ascribed thereto in the Credit Agreement.

“Equity Interest” shall mean all Equity Interests in Enrichment, the Guarantor
Pledgors party to this Agreement as of the Effective Date and any Guarantor Pledgor which becomes a
direct or indirect subsidiary of the Parent after the Effective Date, including without limitation,
all shares of capital stock or other Equity Interests described on Annex A (as such
Annex A may be amended or supplemented from time to time), and the certificates, if any,
representing such shares or other Equity Interests, and all dividends, distributions, cash,
warrants, rights, options, instruments, securities and other property or proceeds from time to time
received, receivable or otherwise distributed in respect of or in exchange for any or all of such
shares or other Equity Interests and any other warrant, right or option to acquire any of the
foregoing.

“General Intangibles” shall have the meaning ascribed thereto in the Uniform
Commercial Code, provided that “General Intangibles” shall not include (a) Copyright
Collateral, Patent Collateral or Trademark Collateral, (b) the rights of the Pledgors under
contracts, agreements, licenses or permits to the extent that the grant by the Pledgors, or the
enforcement by the Agent, of a security interest in such contract, agreement, license or permit
would violate the terms thereof or applicable law or regulation (other than to the extent that any
such term, law or regulation would be rendered ineffective pursuant to the Uniform Commercial Code
or any other applicable law (including the Bankruptcy Code) or regulation or principles of equity)
or (c) the rights of the Pledgors under any contract or agreement pursuant to which the Pledgor is
acting as agent for the United States Government, including without limitation, the Russian
Contract; provided, further, that the foregoing proviso shall not have the effect
of excluding from the Collateral any Accounts or rights to receive any money or other amounts due
or to become due to any Pledgor under any such contract, agreement, license or permit or any
proceeds resulting from the sale or other disposition by any Pledgor of any rights of such Pledgor
under any such contract, agreement, license or permit.

“Instruments” shall have the meaning ascribed thereto in the Uniform Commercial Code,
whether now owned or existing or hereafter acquired, including those evidencing, representing,
securing, arising from or otherwise relating to any Accounts or other Collateral.

“Inventory” shall have the meaning ascribed thereto in the Uniform Commercial Code,
including, without limitation, all goods manufactured, acquired or held for sale or lease, all raw
materials, component materials, work-in-progress and finished goods, all supplies, goods and other
items and materials used or consumed in the manufacture, production, packaging (including the
cylinders owned by the Pledgors in which inventory is placed), delivery, shipping, selling, leasing
or furnishing of such inventory or otherwise in the operation of the business of such Pledgor, all
goods in which such Pledgor now or at any time hereafter has any interest or right of any kind, and
all goods that have been returned to or repossessed by or on behalf of such Pledgor, in each case
whether or not the same is in transit or in the constructive, actual or exclusive occupancy or
possession of such Pledgor or is held by such Pledgor or by others for the account of such Pledgor,
and in each case whether now owned or existing or hereafter acquired or arising, including but not
limited to Eligible Inventory but excluding highly-enriched uranium (HEU) also referred to as
weapons grade uranium and inventory and equipment not owned by a Pledgor and held in storage for
third parties. This definition also shall not, under any circumstances, include any equipment or
material or components thereof owned by third parties (including, but not limited to Customers of a
Pledgor) including, without limitation, feed material, enriched uranium and separative work units,
reflected in the Inventory Accounts maintained by such Pledgor to record the amount of feed
material, enriched uranium and separative work units, credited to such third parties.

“Inventory Account” shall mean a written or electronic record maintained by a Pledgor
in its own name or in the name of a third party, which records natural uranium, enriched uranium,
separative work units and/or other nuclear material or components held by or for Pledgor that is
owned by the named account holder.

“Investment Property” shall have the meaning ascribed thereto in the Uniform
Commercial Code.

“License” shall mean any Copyright License, Patent License or Trademark License.

“Money” shall have the meaning ascribed thereto in the Uniform Commercial Code.

“Patents” shall mean, collectively, all of each Pledgor’s right, title and interest in
and to all United States patents and pending patent applications, patent disclosures and any and
all reissues, continuations, divisions, renewals, extensions, continuations-in-part thereof, in
each case whether now owned or existing or hereafter acquired or arising; provided that
“Patents” shall not include those items relating to advanced enrichment technologies.

“Patent Collateral” shall mean, collectively, all Patents and all Patent Licenses to
which any Pledgor is or hereafter becomes a party and all other general intangibles embodying,
incorporating, evidencing or otherwise relating or pertaining to any Patent or Patent License, in
each case whether now owned or existing or hereafter acquired or arising.

“Patent License” shall mean any agreement, whether written or oral, now or hereafter
in effect granting to any third party any right to make, use or sell any invention on which one or
more of the Patents, now or hereafter owned by any Pledgor or which any Pledgor otherwise has the
right to license, is in existence, or granting to any Pledgor any right to make, use or sell any
invention on which property of the type described in the definition of Patents herein, now or
hereafter owned by any third party, is in existence, and all rights of any Pledgor under any such
agreement.

“Permitted Liens” shall have the meaning given to such term in Section 3.1.

“Proceeds” shall have the meaning given to such term in Section 2.1.

“Secured Obligations” shall have the meaning given to such term in Section 2.2.

“Secured Parties” shall mean, collectively, the Lenders (including, without
limitation, the Issuing Bank, any Lender or affiliate of a Lender to which any Pledgor owes any
Banking Services Obligations and any counterparty to any Derivative Obligation with any Pledgor
which is required or permitted under the Credit Agreement that is or was at the time such
Derivative Obligation was entered into, a Lender or an affiliate of a Lender) and the Agent.

“Securities Account” shall have the meaning ascribed to such term in the Uniform
Commercial Code.

“Securities Act” shall have the meaning given to such term in Section 6.5.

“Termination Requirements” shall have the meaning given to such term in Section 8.3.

“Trademarks” shall mean, collectively, all of each Pledgor’s United States trademarks,
service marks, trade names, corporate and company names, business names, fictitious business names,
service marks, logos, trade dress, trade styles, other source or business identifiers, designs and
general intangibles of a similar nature, including any registrations and applications thereof (but
excluding any application to register any trademark, service mark or other mark prior to the filing
under applicable law of a verified statement of use (or the equivalent) for such trademark, service
mark or other mark if the creation of a Lien thereon or security interest therein would void or
invalidate such trademark, service mark or other mark), all renewals and extensions thereof, all
rights corresponding thereto, and all goodwill associated therewith or symbolized thereby, in each
case whether now owned or existing or hereafter acquired or arising; provided that
“Trademarks” shall not include those items relating to advanced enrichment technologies.

“Trademark Collateral” shall mean, collectively, all Trademarks and Trademark Licenses
to which any Pledgor is or hereafter becomes a party and all other general intangibles embodying,
incorporating, evidencing or otherwise relating or pertaining to any of the Trademarks or Trademark
Licenses, in each case whether now owned or existing or hereafter acquired or arising.

“Trademark License” shall mean any agreement, whether written or oral, now or
hereafter in effect granting any right to any third party under any of the Trademarks now or
hereafter owned by any Pledgor or which any Pledgor otherwise has the right to license, or granting
any right to any Pledgor under any property of the type described in the definition of Trademarks
herein now or hereafter owned by any third party, and all rights of any Pledgor under any such
agreement.

“Uniform Commercial Code” shall mean the Uniform Commercial Code as the same may be in
effect from time to time in the State of New York; provided that if, by reason of
applicable law, the validity or perfection or the effect of perfection or non-perfection or the
priority of any security interest in any Collateral granted under this Agreement is governed by the
Uniform Commercial Code as in effect in a jurisdiction other than New York, then as to the validity
or perfection or the effect of perfection or non-perfection or the priority, as the case may be, of
such security interest, “Uniform Commercial Code” shall mean the Uniform Commercial Code as in
effect in such other jurisdiction.

1.2 Classified Information. In no event shall any of the Copyright Collateral, Patent
Collateral or Trademark Collateral include any Copyright, Patent or Trademark, any application for
a Copyright, Patent or Trademark, or any license or right under any Copyright, Patent or Trademark
that is “classified” for reasons of national security or foreign policy under applicable laws or
with respect to which Pledgor is not entitled to pledge, sublicense or assign pursuant to its terms
or applicable law or regulation.

1.3 Other Terms. All terms in this Agreement that are not capitalized shall have the
meanings provided by the Uniform Commercial Code to the extent the same are used or defined
therein, unless the context suggests that a different meaning is intended.

ARTICLE II

CREATION OF SECURITY INTEREST

2.1 Pledge and Grant of Security Interest. Each Pledgor hereby pledges and assigns to
the Agent, for the ratable benefit of the Secured Parties, and grants to the Agent, its successors
and assigns, for the ratable benefit of the Secured Parties, a Lien upon and security interest in,
all of such Pledgor’s right, title and interest in and to the following, in each case whether now
owned or existing or hereafter acquired or arising or in which such Pledgor now has or at any time
in the future may acquire any right, title or interest (collectively, the “Collateral”):

(i) all Accounts;

(ii) all Chattel Paper;

(iii) all Deposit Accounts;

(iv) all Documents relating to any of the Collateral;

(v) all Instruments;

(vi) all Inventory;

(vii) all Investment Property representing Permitted Investments which are not Deposit
Accounts;

(viii) all cash which is not in a Deposit Account and all Money;

(ix) all Equity Interests (other than Equity Interests in Enrichment, which, subject to
Section 2.3(b), are pledged to the Agent pursuant to Section 2.3); provided,
however, that no Equity Interests of any Foreign Subsidiary shall be included hereunder to
the extent that the aggregate amount of Equity Interests of such Foreign Subsidiary pledged
hereunder would exceed 65% of such Foreign Subsidiary’s Equity Interests;

(x) all books and records, wherever located, relating to any of the Collateral;

(xi) all General Intangibles;

(xii) and any and all proceeds, as such term is defined in the Uniform Commercial Code,
products, rents and profits of or from any and all of the foregoing and, to the extent not
otherwise included in the foregoing, (x) all payments under any insurance (whether or not the Agent
is the loss payee thereunder), indemnity, warranty or guaranty with respect to any of the foregoing
Collateral, (y) all payments in connection with any requisition, condemnation, seizure or
forfeiture with respect to any of the foregoing Collateral and (z) all other amounts from time to
time paid or payable under or with respect to any of the foregoing Collateral (collectively,
“Proceeds”). Each Pledgor authorizes the Agent to file financing statements under the
Uniform Commercial Code describing the Collateral and to file appropriate statements with the
appropriate jurisdictions describing any other statutory liens held by the Agent;

In no event shall the Collateral include, and no Pledgor shall be deemed to have granted a security
interest in (i) the DOE Collateral and (ii) any of such Pledgor’s rights or interests in any
license, contract or agreement to which such Pledgor is a party or any of its or interests
thereunder to the extent, but only to the extent, that such a grant would, under the terms of such
license, contract or agreement or otherwise, result in a breach of the terms of, or constitute a
default under any license, contract or agreement to which such Pledgor is a party (other than to
the extent that any such term would be rendered ineffective pursuant to the Uniform Commercial Code
or any other applicable law (including the Bankruptcy Code) or principles of equity);
provided that immediately upon the ineffectiveness, lapse or termination of any such
provision, the Collateral shall include, and such Pledgor shall be deemed to have granted a
security interest in, all such rights and interests as if such provision had never been in effect;
and provided further that any Account or money or other amounts due or to become
due to such Pledgor under any such license, contract or agreement or any proceeds resulting from
the sale or other disposition by any Pledgor of any rights of such Pledgor under any such license,
contract or agreement shall at no time be excluded from the Collateral or the security interest
granted by such Pledgor hereunder in favor of the Agent.

2.2 Security for Secured Obligations. This Agreement and the Collateral of each
Pledgor secure the full and prompt payment, at any time and from time to time as and when due
(whether at the stated maturity, by acceleration or otherwise), of all the following liabilities
and obligations of the Pledgors: (a) all liabilities and obligations of the Pledgors under the
Financing Documents, whether such liabilities and obligations are now existing or hereafter
incurred, created or arising and whether direct or indirect, absolute or contingent, due or to
become due, including, without limitation, (i) in the case of the Borrowers, all principal of and
interest on the Loans, all reimbursement obligations in respect of Letters of Credit and all fees,
expenses, indemnities and other amounts payable by the Borrowers under the Credit Agreement or any
other Financing Document (including interest accruing after the filing of a petition or
commencement of a case by or with respect to any Borrower seeking relief under any applicable
federal and state laws pertaining to bankruptcy, reorganization, arrangement, moratorium,
readjustment of debts, dissolution, liquidation or other debtor relief, specifically including,
without limitation, the Bankruptcy Code and any fraudulent transfer and fraudulent conveyance laws,
whether or not the claim for such interest is allowed in such proceeding), and (ii) in the case of
any Guarantor Pledgor, all of its liabilities and obligations as a Guarantor pursuant to its
respective Pledgor Guaranty; (b) all Derivative Obligations of the Pledgors to extent such
Derivative Obligations are required or permitted under the Credit Agreement and are due and owing
to any Secured Party; and (c) all Banking Services Obligations of the Pledgors; and in each case
under (a), (b) and (c) above, (A) all such liabilities and obligations that, but for the operation
of the automatic stay under Section 362(a) of the Bankruptcy Code, would become due, and (B) all
fees, costs and expenses payable by such Pledgor under Section 8.1 (the liabilities and obligations
of the Pledgors described in this Section 2.2, collectively, the “Secured Obligations”).

2.3 Deferred Interests.

(a) Subject to Section 2.3(b), each Pledgor hereby pledges and assigns to the Agent, for the
ratable benefit of the Secured Parties, and grants to the Agent, its successors and assigns, for
the ratable benefit of the Secured Parties, a Lien upon and security interest in, all of such
Pledgor’s right, title and interest in and to the following, in each case whether now owned or
existing or hereafter acquired or arising or in which such Pledgor now has or at any time in the
future may acquire any right, title or interest (it being understood that, subject to Section
2.3(b) and Section 2.3(c), the following assets and properties shall also constitute “Collateral”
as used in this Agreement):

(i) all Copyright Collateral;

(ii) all Equity Interests in Enrichment;

(iii) all Patent Collateral;

(iv) all Trademark Collateral; and

(v) any and all proceeds, as such term is defined in the Uniform Commercial Code, products,
rents and profits of or from any and all of the foregoing and, to the extent not otherwise included
in the foregoing, (w) all payments under any insurance (whether or not the Agent is the loss payee
thereunder), indemnity, warranty or guaranty with respect to any of the foregoing Collateral, (x)
all payments in connection with any requisition, condemnation, seizure or forfeiture with respect
to any of the foregoing Collateral, (y) all claims and rights to recover for any past, present or
future infringement or dilution of or injury to any Copyright Collateral, Patent Collateral or
Trademark Collateral, and (z) all other amounts from time to time paid or payable under or with
respect to any of the foregoing Collateral (it being understood that, subject to Section 2.3(b) and
Section 2.3(c), the foregoing assets and properties referred to in this clause (v) shall also
constitute “Proceeds” as used in this Agreement).

(b) Notwithstanding the provisions of Section 2.3(a) or any of the provisions contained herein
or in the Credit Agreement, no Lien upon and security interest in the Deferred Interests shall be
deemed to have occurred nor shall any such Lien and security interest be deemed to have attached to
or on the Deferred Interests until any of the following events shall have occurred (each a
“Deferred Interests Triggering Event”): (i) Collateral Availability shall fall below
$75,000,000 for seven (7) consecutive Business Days and the Agent, in its Permitted Discretion,
shall have notified the Pledgors that such event constitutes a Deferred Interests Triggering Event,
(ii) Trailing Average Collateral Availability for any quarter shall fall below $75,000,000 and the
Agent, in its Permitted Discretion, shall have notified the Pledgors that such event constitutes a
Deferred Interests Triggering Event or (iii) an Event of Default shall have occurred and be
continuing and the Agent, in its sole discretion, shall have notified the Pledgors that such event
constitutes a Deferred Interests Triggering Event. Immediately upon the occurrence of any Deferred
Interests Triggering Event, a Lien on the Deferred Interests consisting of Equity Interests in
Enrichment and all Proceeds related thereto shall automatically be deemed to have attached in favor
of the Agent pursuant to this Section 2.3 without any further action by the Agent or any Pledgor
and, on and after the occurrence of such Deferred Interests Triggering Event, the Agent shall be
authorized to file financing statements under the Uniform Commercial Code describing the Collateral
represented by such Deferred Interests and each Pledgor, as applicable, shall take all necessary
actions, including, but not limited to, those required by Sections 4.10, 4.12 and 5.1 herein to
complete any required annexes to this Agreement, as promptly as possible (and in no event more than
ten (10) days from the occurrence of any such Deferred Interests Triggering Event) as reasonably
requested by the Agent at such Pledgor’s expense in order to give the Agent a first priority
security interest (subject to Permitted Liens) in the Collateral represented by such Deferred
Interests. Immediately upon the occurrence of any Deferred Interests Triggering Event (other than
a Deferred Interest Triggering Event set forth in clause (i) above), a Lien on the Deferred
Interests consisting of Copyright Collateral, Patent Collateral, Trademark Collateral and all
Proceeds related thereto shall automatically be deemed to have attached in favor of the Agent
pursuant to this Section 2.3 without any further action by the Agent or any Pledgor and, on and
after the occurrence of such Deferred Interests Triggering Event, the Agent shall be authorized to
file financing statements under the Uniform Commercial Code describing the Collateral represented
by such Deferred Interests and each Pledgor, as applicable, shall take all necessary actions,
including, but not limited to, those required by Sections 4.9, 4.10 and 4.12 herein to complete any
required annexes to this Agreement, as promptly as possible (and in no event more than ten (10)
days from the occurrence of any such Deferred Interests Triggering Event) as reasonably requested
by the Agent at such Pledgor’s expense in order to give the Agent a first priority security
interest (subject to Permitted Liens) in the Collateral represented by such Deferred Interests. As
of the date on which a Lien on any Deferred Interests attaches pursuant to this Section 2.3, the
Pledgors shall be deemed to have reaffirmed the representations and warranties set forth in Article
III with respect to such Deferred Interests.

(c) Without limiting Section 1.2, in no event shall the Collateral include, and no Pledgor
shall be deemed to have granted a security interest in any of such Pledgor’s rights or interests in
any license, contract or agreement to which such Pledgor is a party or any of its or interests
thereunder to the extent, but only to the extent, that such a grant would, under the terms of such
license, contract or agreement or otherwise, result in a breach of the terms of, or constitute a
default under any license, contract or agreement to which such Pledgor is a party (other than to
the extent that any such term would be rendered ineffective pursuant to the Uniform Commercial Code
or any other applicable law (including the Bankruptcy Code) or principles of equity);
provided that immediately upon the ineffectiveness, lapse or termination of any such
provision, the Collateral shall include, and such Pledgor shall be deemed to have granted a
security interest in, all such rights and interests as if such provision had never been in effect;
provided further that any Account or money or other amounts due or to become due to such
Pledgor under any such license, contract or agreement or any proceeds resulting from the sale or
other disposition by any Pledgor of any rights of such Pledgor under any such license, contract or
agreement shall at no time be excluded from the Collateral or the security interest granted by such
Pledgor hereunder in favor of the Agent.

(d) Except as specifically provided herein or in the Credit Agreement, no Pledgor will sell or
otherwise dispose of, grant any option with respect to, or grant any Lien with respect to or
otherwise encumber any of the Deferred Interests or any interest therein.

2.4 Inventory Account. Each Pledgor shall establish, in its own name, an Inventory
Account to which all Pledgor-owned uranium and SWU Component in the Inventory shall be credited.
The balance of material credited to this Inventory Account shall be reconciled monthly, or more
often as may reasonably be requested by the Agent under the Credit Agreement, as part of the
Borrowing Base calculation.

ARTICLE III

REPRESENTATIONS AND WARRANTIES

Each Pledgor represents and warrants as follows:

3.1 Ownership of Collateral. Each Pledgor owns, or has valid rights as a lessee or
licensee, or the power to transfer or pledge with respect to, all Collateral (including without
limitation, all Deferred Interests which have become Collateral and all Deferred Interests which
would become Collateral if a Deferred Interests Triggering Event were to occur) purported to be
pledged by it hereunder, free and clear of any Liens, except for the Liens granted to the Agent for
the benefit of the Secured Parties pursuant to this Agreement and except for other Liens permitted
pursuant to Section 6.02 of the Credit Agreement (“Permitted Liens”). No security
agreement, financing statement or other public notice with respect to all or any part of the
Collateral (including without limitation, all Deferred Interests which have become Collateral and
all Deferred Interests which would become Collateral if a Deferred Interests Triggering Event were
to occur) is on file or of record in any government or public office, and no Pledgor has filed or
consented to the filing of any such statement or notice, except (i) Uniform Commercial Code
financing statements naming the Agent as secured party and Uniform Commercial Code financing
statements which have been terminated, (ii) security instruments filed in the U.S. Copyright Office
or the U.S. Patent and Trademark Office naming the Agent as secured party and (iii) as may be
otherwise permitted by the Credit Agreement.

3.2 Security Interests; Filings. This Agreement, together with (i) the filing of duly
completed and authorized Uniform Commercial Code financing statements (A) naming each Pledgor as
debtor, (B) naming the Agent as secured party, and (C) describing the Collateral, in the
jurisdictions set forth with respect to such Pledgor on Annex B hereto, (ii) when the Lien
on the Deferred Interests attaches pursuant hereto, the filing of duly completed and executed
assignments in the forms set forth as Exhibits B, C and D with the U.S.
Copyright Office or the U.S. Patent and Trademark Office, and, as appropriate, with regard to
federally registered Copyright Collateral, Patent Collateral and Trademark Collateral of each
Pledgor, as the case may be, (iii) the registration of transfer thereof to the Agent on the
issuer’s books or the execution by the issuer or securities intermediary (as applicable) of a
control agreement satisfying the requirements of Section 8-106 (or its successor provision) of the
Uniform Commercial Code with regard to uncertificated securities and Investment Property (other
than certificated securities) included in the Collateral, and (iv) the delivery to the Agent of all
certificated securities (including without limitation, certificated securities evidencing the
Equity Interests in Enrichment if and when the Lien on such Deferred Interests attaches) and
Instruments included in the Collateral together with undated stock powers or instruments of
transfer duly executed in blank, creates, and at all times shall constitute, a valid and perfected
security interest in and Lien upon the Collateral in favor of the Agent, for the benefit of the
Secured Parties, to the extent that Articles 8 and 9 of the Uniform Commercial Code are applicable
thereto, superior and prior to the rights of all other persons therein (except for Permitted
Liens), and no other or additional filings, registrations, recordings or actions are or shall be
necessary or appropriate in order to perfect or maintain the perfection and priority of such Lien
and security interest, other than actions required with respect to Collateral of the types excluded
from Articles 8 or 9 of the Uniform Commercial Code or from the filing requirements under Article 9
of the Uniform Commercial Code by reason of Sections 9-309, 9-310, 9-311 and 9-312 of the Uniform
Commercial Code and other than continuation statements required under the Uniform Commercial Code
(it being specifically noted that the Agent may at its option, but shall not be required to,
require, subject to the limitations set forth in Sections 3.10 and 4.11 hereof, that any bank or
other depository institution at which a Deposit Account is maintained enter into a written
agreement in form reasonably satisfactory to the Agent or take such other action as may be required
by law to perfect the security interest of the Agent in such Deposit Account and the funds
therein.)

3.3 Locations. Annex C lists, as to each Pledgor, (i) the addresses of its
chief executive office, each other place of business and for any Pledgor which is organized under
the laws of any state, its state of registration and registration I.D. number, (ii) the address of
each location where all original invoices, ledgers, chattel paper, Instruments and other records or
information evidencing or relating to the Collateral of such Pledgor are maintained, and (iii) the
address of each location at which any Inventory owned by such Pledgor is kept or maintained, in
each instance except for any new locations established in accordance with the provisions of Section
4.2 and except for Inventory which, in the ordinary course of business, is in transit (i) from a
supplier to a Pledgor, (ii) between locations listed on Annex C, or (iii) to customers or
processors. Except as may be otherwise noted therein, all locations identified in Annex C
are leased by the applicable Pledgor. No Pledgor presently conducts business under any prior or
other corporate or company name or under any trade or fictitious names, except as indicated beneath
its name on Annex C, and no Pledgor has entered into any contract or granted any Lien
within the past five (5) years under any name other than its legal name or a trade or fictitious
name indicated on Annex C. Each trade or fictitious name is a trade name and style (and
not the name of an independent corporation or other legal entity) by which a Pledgor may identify
and sell certain of its goods or services and conduct a portion of its business; all related
Accounts are owned solely by the applicable Pledgors and are subject to the Liens and other terms
of this Agreement; and in no event shall a Pledgor assert that products invoiced under the name of
any trade or fictitious name that are subject to a dispute with Customers are not subject to the
terms of this Agreement as though such trade or fictitious name did not exist.

3.4 Authorization; Consent. No authorization, consent or approval of, or declaration
or filing with, any Governmental Authority (including, without limitation, any notice filing with
state tax or revenue authorities required to be made by account creditors in order to enforce any
Accounts in such state) is required for the valid execution, delivery and performance by any
Pledgor of this Agreement, the grant by it of the Lien and security interest in favor of the Agent
provided for herein, or the exercise by the Agent of its rights and remedies hereunder, except for
(i) the filings and actions described in Section 3.2, (ii) in the case of Accounts owing from any
federal governmental agency or authority, the filing by the Agent of a notice of assignment in
accordance with the federal Assignment of Claims Act of 1940, as amended, (iii) in the case of
Equity Interests, such filings and approvals as may be required in connection with a disposition of
any such Collateral by laws affecting the offering and sale of securities generally, (iv) consents
and approvals, if any, required from the Department of Energy in its capacity as owner of the
plants in connection with the exercise of remedies hereunder under circumstances where none of the
Pledgors remained in control of such plants or in control of the portion of such plants where
Collateral is located, and (v) the other consents and approvals described in Section 8.16.

3.5 No Restrictions. There are no statutory or regulatory restrictions, prohibitions
or limitations on any Pledgor’s ability to grant to the Agent a Lien upon and security interest in
the Collateral (including without limitation, all Deferred Interests which have become Collateral
and all Deferred Interests which would become Collateral if a Deferred Interests Triggering Event
were to occur) pursuant to this Agreement or (except for the provisions of the federal Assignment
of Claims Act of 1940, as amended, or applicable regulatory limitations on access to U.S.
Government-owned facilities) the exercise by the Agent of its rights and remedies hereunder
(including any foreclosure upon or collection of the Collateral) except for the restrictions
described in Section 8.16, and there are no contractual restrictions, prohibitions or limitations
on any Pledgor’s ability so to grant such Lien and security interest or on the exercise by the
Agent of its rights and remedies hereunder (including any foreclosure upon or collection of the
Collateral).

3.6 Eligible Receivables.

(a) All Eligible Receivables owned by the Pledgors on the Effective Date constitute bona fide
Receivables arising in the ordinary course of business, the amount of which is actually owing and
payable to the Pledgors in the ordinary course of business. All such Eligible Receivables, net of
a bad debt reserve determined in accordance with generally accepted accounting principles, are
collectible in accordance with their terms.

(b) Each Eligible Receivable arising after the Effective Date shall be on the date of its
creation a good and valid account representing an undisputed bona fide indebtedness incurred or an
amount indisputably owed by the Customer therein named, for a fixed sum, to the extent, set forth
in the invoice relating thereto; none of the transactions underlying or giving rise to any such
Eligible Receivable shall violate any laws or regulations, and all documents relating to any such
Eligible Receivable shall be legally sufficient under such laws or related regulations applicable
to such Pledgor or Customer and are legally enforceable in accordance with their terms; no
agreement under which any deduction or offset of any kind, other than normal trade discounts and
discounts granted by a Pledgor in the ordinary course of its business in accordance with its
historical practices, have been granted by such Pledgor, at or before the time such Eligible
Receivable was created; all documents and agreements relating to such Eligible Receivable shall be
true and correct and in all respects what they purport to be; to the best of such Pledgor’s
knowledge, all signatures and endorsements that appear on all documents and agreements relating to
such Eligible Receivable are genuine and all signatories and endorsers shall have full capacity to
contract; and such Eligible Receivable is not evidenced by Chattel Paper or an Instrument, or if
so, such Chattel Paper or Instrument shall be duly endorsed to the order of the Agent and delivered
to the Agent to be held as Collateral hereunder.

3.7 Equity Interests. The Equity Interests required to be pledged hereunder (other
than the Equity Interests in Enrichment) by each Pledgor that owns any such Equity Interests
consist of the number and type of shares of capital stock (in the case of issuers that are
corporations) or the percentage and type of other Equity Interests (in the case of issuers other
than corporation) as described beneath such Pledgor’s name in Annex A. As of the date on
which the Lien on the Deferred Interests attaches as provided in Section 2.3(b), the Equity
Interests in Enrichment required to be pledged hereunder will consist of the number and type of
shares of capital stock as described on Annex A to the Pledge Amendment (as defined below)
executed and delivered by the Parent to the Agent pursuant to Section 5.1(b). All of the Equity
Interests (including without limitation, all Equity Interests constituting Deferred Interests)
shall have been duly and validly issued and are fully paid and nonassessable and not subject to any
preemptive rights, warrants, options or similar rights or restrictions in favor of third parties or
any contractual or other restrictions upon transfer other than as may be permitted under the Credit
Agreement, except for the restrictions described in Section 8.16.

3.8 Intellectual Property. Concurrently with the execution and delivery of this
Agreement by the Pledgors, the Pledgors have delivered to the Agent a schedule of material Patents
and Trademarks, which schedule correctly sets forth all material registered Patents and Trademarks
owned by the Pledgors as of the date hereof. As of date on which the Lien on the Deferred
Interests attaches pursuant hereto, Annexes D, E and F correctly
set forth all registered Copyrights, Patents and Trademarks owned by any Pledgor as of the date
thereof and used or proposed to be used in its business. Except to the extent set forth on Schedule
3.09(b) to the Credit Agreement, as of the date hereof and as of the date on which the Lien on such
Deferred Interests attaches, each Pledgor owns or possesses the valid right to use all Copyrights,
Patents and Trademarks material to its business and, to the best of such Pledgor’s knowledge, the
use thereof by the Pledgors does not infringe upon the rights of any other Person, except for any
such infringements that, individually or in the aggregate, would not reasonably be expected to have
a Material Adverse Effect. As of the date hereof and as of the date on which the Lien on the
Deferred Interests attaches, all Copyrights, Patents and Trademarks (a) have been duly registered
in, filed in or issued by the United States Patent and Trademark Office or other corresponding
offices of other applicable jurisdictions, where such registration or filing is commercially
reasonable, the subject matter of the Patent or Trademark is not “classified” for reasons of
national security or foreign policy, and registration and filing is permitted by applicable law or
regulation, and (b) have been properly maintained and renewed in accordance with all applicable
provisions of law and administrative regulations in the United States or in each such other
jurisdiction, as applicable, except, in each case, for such Patents, Trademarks or Copyrights
which, as reasonably determined by the Pledgors consistent with prudent and commercially reasonable
business practices (x) are not material to the business of the Pledgors or (y) the Pledgors have
abandoned prior to the date on which the Lien on such Deferred Interests attaches.

3.9 Documents of Title. No material bill of lading, warehouse receipt or other
document or instrument of title is outstanding with respect to any Collateral other than Inventory
in transit in the ordinary course of business to a location set forth on Annex C or to a
Customer of a Pledgor, or to a Fabricator or other nuclear fuel processor.

3.10 Deposit Accounts and Securities Accounts. Annex H correctly sets forth
all Deposit Accounts and Securities Accounts of each Pledgor. Each such Deposit Account (other
than any Deposit Account maintained with the Agent) with an average monthly balance exceeding
$100,000 is covered by a deposit account control agreement in favor of the Agent, in form and
substance satisfactory to the Agent, but in no event shall the aggregate average monthly balances
of such Deposit Accounts not covered by satisfactory deposit account control agreements exceed
$500,000. Each such Securities Account is covered by a securities account control agreement in
favor of the Agent, in form and substance satisfactory to the Agent.

ARTICLE IV

COVENANTS

4.1 Use and Disposition of Collateral. So long as no Event of Default shall have
occurred and be continuing, each Pledgor may, in any lawful manner not inconsistent with the
provisions of this Agreement and the other Financing Documents, use, control and manage the
Collateral in the operation of its businesses, and receive and use the income, revenue and profits
arising therefrom and the Proceeds thereof, in the same manner and with the same effect as if this
Agreement had not been made; provided, however, that no Pledgor will sell or
otherwise dispose of, grant any option with respect to, or grant any Lien with respect to or
otherwise encumber any of the Collateral or any interest therein, except for the security interest
created in favor of the Agent hereunder and except as may be otherwise expressly permitted in
accordance with the terms of this Agreement and the Credit Agreement (including any applicable
provisions therein regarding delivery of proceeds of sale or disposition to the Agent). Nothing
herein shall preclude any Borrower from swapping Inventory for comparable material of equal or
greater value.

4.2 Change of Name, Locations, etc. No Pledgor will (i) change its name, or, if
applicable, the state in which it is registered, (ii) change its chief executive office from the
location thereof listed on Annex C, (iii) except as permitted by Section 4.6, remove any
Collateral (other than goods in transit), or any books, records or other information relating to
Collateral, from the applicable location thereof listed on Annex C, or keep or maintain any
Collateral at a location not listed on Annex C, unless in each case such Pledgor has (A)
given fifteen (15) days’ prior written notice to the Agent of its intention to do so, together with
information regarding any such new location and such other information in connection with such
proposed action as the Agent may reasonably request, and (B) delivered to the Agent fifteen (15)
days prior to any such change or removal of such documents, instruments and financing statements as
may be required under applicable law, all in form and substance reasonably satisfactory to the
Agent, paid all necessary filing and recording fees and taxes, and taken all other actions
reasonably requested by the Agent (including, at the request of the Agent, delivery of opinions of
counsel reasonably satisfactory to the Agent to the effect that all such actions have been taken),
in order to perfect and maintain the Lien upon and security interest in the Collateral provided for
herein in accordance with the provisions of Section 3.2.

4.3 Records; Inspection.

(a) Each Pledgor will keep and maintain at its own cost and expense satisfactory and complete
records of the Accounts and all other Collateral, including, without limitation, records of all
payments received, all credits granted thereon, all merchandise returned and all other
documentation relating thereto, and will furnish to the Agent from time to time such statements,
schedules and reports (including, without limitation, accounts receivable aging schedules) with
regard to the Collateral as the Agent may reasonably request.

(b) In addition to the rights of inspection of the Agent and the Lenders under Section 5.04 of
the Credit Agreement and subject to the provisions of Section 9.12 of the Credit Agreement, each
Pledgor shall, from time to time at such times as may be reasonably requested and upon reasonable
notice, to the extent permitted under Section 5.04 of the Credit Agreement, make available to the
Agent or any Lender for inspection and review at such Pledgor’s offices copies of all invoices and
other documents and information relating to the Collateral (including, without limitation, itemized
schedules of all collections of Accounts, showing the name of each account debtor, the amount of
each payment and such other information as the Agent shall reasonably request). At the request of
the Agent, each Pledgor will legend, in form and manner reasonably satisfactory to the Agent, the
books, records and materials evidencing or relating to the Collateral with an appropriate reference
to the fact that the Collateral has been assigned to the Agent and that the Agent has a security
interest therein. The Agent shall have the right to make test verifications of Accounts in any
reasonable manner and through any reasonable medium, and each Pledgor agrees to furnish all such
reasonable assistance and information as the Agent may require in connection therewith,
provided that, so long as no Event of Default shall have occurred and be continuing, any
such verification shall be conducted either by the Borrower’s independent public accountants in the
name of the Pledgor or in such other manner so as not to disclose the Agent’s identity or interest
in the Collateral.

4.4 Accounts.

(a) Upon the occurrence and continuance of an Event of Default, each Pledgor shall, at the
request of the Agent, take such action as the Agent may deem necessary or advisable (within
applicable laws) to enforce collection of its Accounts. No Pledgor shall, except to the extent
done in the ordinary course of its business consistent with past practices and in accordance with
sound business judgment and provided that no Event of Default shall have occurred and be
continuing, (i) grant any extension of the time for payment of any Account, (ii) compromise or
settle any Account for less than the full amount thereof, (iii) release, in whole or in part, any
person or property liable for the payment of any Account, or (iv) allow any credit or discount on
any Account. In each Borrowing Base Certificate delivered pursuant to Section 5.01(g) of the
Credit Agreement, the Pledgors shall inform the Agent of any material disputes with any account
debtor or obligor and of any claimed offset and counterclaim that may be asserted with respect
thereto, where the Pledgors reasonably believe that the likelihood of payment by such account
debtor is materially impaired, indicating in detail the reason for the dispute, all claims relating
thereto and the amount in controversy.

(b) Each Pledgor will, at its own cost and expense, (i) arrange for remittances on Accounts to
be made directly to lockboxes designated by the Agent which shall be in the name of the Agent and
subject to control by the Agent or in such other manner as the Agent may direct, and (ii) promptly
deposit, or cause to be deposited, all payments received by such Pledgor on account of Accounts and
the Proceeds of other Collateral or from the sale or other disposition of assets permitted pursuant
to the Credit Agreement, whether in the form of cash, checks, notes, drafts, bills of exchange,
money orders or otherwise, in the cash collateral account established at the offices of the Agent
and designated by the Agent for such purpose, in precisely the form received (but with any
endorsements of such Pledgor necessary for deposit or collection), subject to withdrawal by the
Agent only, as hereinafter provided, and until such payments are deposited, such payments shall be
deemed to be held in trust by such Pledgor for and as the Lenders’ property and shall not be
commingled with such Pledgor’s other funds. All remittances and payments that are deposited in
accordance with the foregoing will be applied by the Agent to reduce the outstanding balance (or if
such balance is reduced to zero, to be held by the Agent as cash collateral), of the Loans, subject
to final collection in cash of the item deposited and subject to the assessment of a two-day
collection charge; provided, however, that, so long as no Event of Default has
occurred and is continuing and Availability exceeds $75,000,000, the Borrowers may require that all
remittances and payments that are deposited in accordance with the foregoing be forwarded to any
other account of any Borrower. Except upon the occurrence and during the continuance of an Event
of Default, no payment of a Eurodollar Borrowing shall be made under this Section on a date other
than the last date of the Interest Period for such Eurodollar Borrowing or the Maturity Date. To
the extent that a payment hereunder creates a credit balance under the Secured Obligations, such
credit balance shall bear interest and the Agent shall credit the Secured Obligations at a rate per
annum equal to the greater of (x) zero percent (0%) and (y) the Prime Rate minus three percent
(3%). Upon the occurrence and continuance of an Event of Default, the Agent may send a notice of
assignment and/or notice of the Agent’s security interest to any and all customers or any third
party holding or otherwise concerned with any of the Collateral, and thereafter the Agent shall
have the sole right to collect Accounts and/or take possession of the Collateral and the books and
records relating thereto and to establish Collateral Accounts as provided for in Section 6.3
hereof.

(c) Pursuant to clause (i) of the definition of “Eligible Receivables” set forth in the Credit
Agreement, Accounts owing from the United States government or any agency or department thereof,
including without limitation, the DOE and the Tennessee Valley Authority, shall, in the Agent’s
Permitted Discretion, not constitute Eligible Receivables unless the Agent shall have received such
documentation from the Pledgors as the Agent shall in its Permitted Discretion upon reasonable
prior notice to the Pledgors require to enable the Agent to make all filings necessary to comply
with the federal Assignment of Claims Act of 1940, as amended with respect to each contract under
which such Accounts arise (such documentation being the “FACA Documents”). In the event
that the Pledgors have executed and delivered to the Agent any FACA Documents in respect of any
contract and Collateral Availability shall fall below $75,000,000 for seven (7) consecutive
Business Days or any Event of Default shall occur and be continuing, the Agent shall be entitled to
file such FACA Documents with the applicable Governmental Authorities and, upon such filing, to
direct such Governmental Authorities to make all payments in respect of such Accounts directly to
the Agent for application to the Secured Obligations as provided in this Agreement. The Pledgors
agree to execute and deliver such other documents and take or cause to be taken such other actions
as the Agent may reasonably request in connection with any such filing of FACA Documents pursuant
to this paragraph.

4.5 Instruments. Each Pledgor agrees that if any Collateral shall at any time be
evidenced by a promissory note, tangible Chattel Paper or other Instrument (other than checks or
other Instruments for deposit in the ordinary course of business), the same shall promptly be duly
endorsed to the order of the Agent and delivered to the Agent to be held as Collateral hereunder.

4.6 Inventory. Each Pledgor will, in accordance with sound business practices,
maintain all Eligible Inventory held by it or on its behalf in good saleable or useable condition.
Unless an Event of Default has occurred and is continuing and the Agent has instructed the Pledgors
otherwise, each Pledgor may, in any lawful manner not inconsistent with the provisions of this
Agreement and the other Financing Documents, process, use, ship, deliver and, in the ordinary
course of business and as permitted under the Credit Agreement, but not otherwise, sell, transfer,
lease or otherwise dispose of its Inventory. Without limiting the generality of the foregoing,
each Pledgor agrees that it shall not permit any Inventory to be in the possession of any bailee,
warehouseman, agent or processor (but not including agents engaged for the sole purpose of
transporting Inventory) at any time unless such Pledgor shall have utilized commercially reasonable
efforts to have notified such bailee, warehouseman, agent or processor of the security interest
created by this Agreement and to have obtained, at such Pledgor’s sole cost and expense, a written
agreement by such person to hold such Inventory subject to the security interest created by this
Agreement and the instructions of the Agent and to waive and release any Lien (whether arising by
operation of law or otherwise) such person may have with respect to such Inventory, such agreement
to be in form and substance reasonably satisfactory to the Agent. Each Pledgor further agrees that
its Eligible Inventory will be produced in compliance with the applicable requirements of the Fair
Labor Standards Act, as amended, if such Inventory is produced by Pledgor in the United States.

4.7 Taxes. Each Pledgor will, to the extent required under Section 5.07 of the Credit
Agreement, pay and discharge (i) all taxes, assessments and governmental charges or levies imposed
upon it, upon its income or profits or upon any of its properties, prior to the date on which
penalties would attach thereto, and (ii) all lawful claims for taxes, assessment, governmental
charges or levies that, if unpaid, might become a Lien upon any of the Collateral.

4.8 Insurance.

(a) Each Pledgor will maintain and pay for, or cause to be maintained and paid for, with
financially sound and reputable insurance companies, insurance with respect to its assets,
properties and business, against such hazards and liabilities, of such types and in such amounts,
as is required pursuant to Section 5.02 of the Credit Agreement.

(b) Each Pledgor hereby irrevocably makes, constitutes and appoints the Agent at all times
during the continuance of an Event of Default, its true and lawful attorney (and agent-in-fact) for
the purpose of making, settling and adjusting claims under such policies of insurance, endorsing
its name on any check, draft, instrument or other item or payment for the proceeds of such policies
of insurance and for making all determinations and decisions with respect to such policies of
insurance.

(c) If any Pledgor fails to obtain and maintain any of the policies of insurance required to
be maintained hereunder or to pay any premium in whole or in part, the Agent may, without waiving
or releasing any obligation or Default, at such Pledgor’s expense, but without any obligation to do
so, procure such policies or pay such premiums. All sums so disbursed by the Agent, including
reasonable attorneys’ fees, court costs, expenses and other charges related thereto, shall be
payable by the Pledgors to the Agent on demand and shall be additional Secured Obligations
hereunder, secured by the Collateral.

(d) Each Pledgor will deliver to the Agent, promptly as rendered, true copies of all material
claims and reports made in any reporting forms to insurance companies. Such Pledgor will deliver
to the Agent one or more certificates of insurance evidencing renewal of the insurance coverage
required hereunder (or issuance of a replacement policy from another insurance company meeting the
requirements of this Section 4.8) plus such other evidence of payment of premiums therefor as the
Agent may request. Upon the reasonable request of the Agent from time to time, each Pledgor will
deliver to the Agent evidence that the insurance required to be maintained pursuant to this Section
is in effect.

4.9 Intellectual Property.

(a) Promptly following the Agent’s request from time to time, the Pledgors shall deliver to
the Agent an updated schedule of material Patents and Trademarks, which schedule shall correctly
set forth all material registered Patents and Trademarks owned by the Pledgors; provided,
however that, for so long as Collateral Availability is greater than $75,000,000, such
requests shall be limited to one time each fiscal year; and provided further, that,
if an Event of Default shall have occurred and be continuing, the Agent may request such updated
schedules as often as the Agent may, in its Permitted Discretion, determine to be appropriate. As
of the date on which the Lien on the Deferred Interests attaches, each Pledgor will, at its own
expense, execute and deliver a fully completed Copyright Security Agreement, Patent Security
Agreement or Trademark Security Agreement in the respective forms of Exhibits B,
C and D, as applicable, with regard to any Copyright Collateral, Patent Collateral
or Trademark Collateral (in each case, to the extent registered or filed, subject to the provisions
of Section 3.8 hereof), as the case may be of such Pledgor, described in Annexes D,
E and F hereto. In the event that after such date any Pledgor shall acquire any
registered Copyright Collateral, Patent Collateral or Trademark Collateral or effect any
registration of any such Copyright Collateral, Patent Collateral or Trademark Collateral or file
any application for registration thereof, within the United States, such Pledgor shall promptly
furnish written notice thereof to the Agent together with information sufficient to permit the
Agent, upon its receipt of such notice, to (and each Pledgor hereby authorizes the Agent to) modify
this Agreement, as appropriate, by amending Annex D, E or F hereto or to
add additional exhibits hereto to include any Copyright Collateral, Patent Collateral or Trademark
Collateral (in each case, to the extent registered or filed, subject to the provisions of Section
3.8 hereof) that becomes part of the Collateral under this Agreement, and such Pledgor shall
additionally, at its own expense, execute and deliver, as promptly as possible (but in any event
within ten (10) days) after the date of such notice, with regard to United States Copyrights,
Patents and Trademarks, fully completed Copyright Security Agreements, Patent Security Agreements
or Trademark Security Agreements in the forms of Exhibits B, C and
D, as applicable, together in all instances with any other agreements, instruments and
documents that the Agent may reasonably request from time to time to further effect and confirm the
security interest created by this Agreement in such Copyright Collateral, Patent Collateral and
Trademark Collateral, and each Pledgor hereby appoints the Agent its attorney-in-fact, upon the
occurrence and the continuance of an Event of Default, to execute, deliver and record any and all
such agreements, instruments and documents for the foregoing purposes, all acts of such attorney
being hereby ratified and confirmed and such power, being coupled with an interest, being
irrevocable for so long as this Agreement shall be in effect with respect to such Pledgor. In that
connection, each Pledgor shall also execute and deliver on the date on which the Lien on the
Deferred Interests attaches, such number of Special Powers of Attorney in the form of Annex
I hereto as may be reasonably requested by the Agent.

(b) The Pledgors shall file and prosecute diligently all applications for registration of
Patents, Trademarks or Copyrights now or hereafter pending that would be necessary to the business
of the Pledgors to which any such applications pertain, and do all acts (or refrain from doing all
acts), in any such instance, reasonably necessary to preserve and maintain all material rights in
Patents, Trademarks or Copyrights, unless such Patents, Trademarks or Copyrights are not material
to the business of the Pledgors, as reasonably determined by the Pledgors consistent with prudent
and commercially reasonable business practices.

(c) From and after the date on which the Lien on the Deferred Interests attaches, each Pledgor
shall notify the Agent promptly if it knows or has reason to know that any material Patent
Collateral, Trademark Collateral or Copyright Collateral used in the conduct of its business may
become abandoned or dedicated to the public, or of any adverse determination or development
(including the institution of, or any such determination or development in, any proceeding in the
U.S. Patent and Trademark Office, U.S. Copyright Office or any court) regarding such Pledgor’s
ownership of any material Patent Collateral, Trademark Collateral or Copyright Collateral, its
right to register the same, or to keep and maintain the same.

(d) From and after the date on which the Lien on the Deferred Interests attaches, in the event
that any Collateral consisting of a material Patent Collateral, Trademark Collateral or Copyright
Collateral used in the conduct of any Pledgor’s business is believed infringed, misappropriated or
diluted by a third party, such Pledgor shall notify the Agent promptly after it learns thereof and
shall, if consistent with the exercise of reasonable business judgment and applicable laws,
regulations and agreements to which the applicable Pledgor is a party, promptly sue for
infringement, misappropriation or dilution and to recover any and all damages for such
infringement, misappropriation or dilution, and take such other actions as are appropriate under
the circumstances to protect such Collateral.

(e) From and after the date on which the Lien on the Deferred Interests attaches, upon the
occurrence and during the continuance of any Event of Default, each Pledgor shall use its
commercially reasonable efforts to obtain all requisite consents or approvals from the licensor of
each material License included within the Copyright Collateral, Patent Collateral or Trademark
Collateral to effect the assignment of all of such Pledgor’s right, title and interest thereunder
to the Agent or its designee.

4.10 Delivery of Collateral. All certificates or instruments representing or
evidencing any material Account, Equity Interest or other Collateral delivered to the Agent
pursuant hereto, shall be in form suitable for transfer by delivery and shall be delivered together
with undated stock powers duly executed in blank, appropriate endorsements or other necessary
instruments of registration, transfer or assignment, duly executed and in form and substance
satisfactory to the Agent, and in each case such other instruments or documents as the Agent may
reasonably request.

4.11 Deposit and Collection Procedures. Each Pledgor agrees that, upon the creation
of a new Deposit Account (other than any such account which is part of the DOE Collateral) not held
with the Agent with an average monthly balance exceeding $100,000 or any new Securities Account, it
will immediately enter into a control agreement in favor of the Agent for such Deposit Account or
Securities Account, as applicable, in form and substance satisfactory to the Agent;
provided that in no event shall the aggregate average monthly balances of such Deposit
Accounts not covered by such control agreements exceed $500,000. Subject to the foregoing
exceptions, no Proceeds of Accounts will be deposited in or at any time transferred to such a
Deposit Account other than such a Deposit Account covered by a control agreement in favor of the
Agent in form and substance reasonably satisfactory to the Agent; provided that in no event
shall any Proceeds of Accounts be deposited in or at any time transferred to any account which is
part of the DOE Collateral. Nothing contained in this Section 4.11 shall prohibit the Pledgors
from making any pledges or deposits permitted by the Credit Agreement.

4.12 Protection of Security Interest. Each Pledgor agrees that it will use
commercially reasonable efforts, at its own cost and expense, to take any and all actions necessary
to warrant and defend the right, title and interest of the Agent and Secured Parties in and to the
Collateral against the claims and demands of all other persons.

4.13 Control of Investment Property and Electronic Chattel Paper. If any Investment
Property (whether now owned or hereafter acquired) is included in the Collateral, each applicable
Pledgor will notify the Agent thereof and will promptly take and cause to be taken all actions
required under Articles 8 and 9 of the Uniform Commercial Code and any other applicable law to
enable the agent to acquire “control” (within the meaning of such term under Section 8-106 (or its
successor provision) of the Uniform Commercial Code) of such Investment Property and as may be
otherwise necessary or deemed appropriate by the Agent to perfect the security interest of the
Agent therein. If any Account of any Pledgor would constitute “electronic chattel paper” as
defined under the Uniform Commercial Code, each Pledgor will promptly notify the Agent and will
take such other steps as may be necessary or deemed appropriate by the Agent to give the Agent
“control” over such electronic chattel paper (within the meaning of Section 9-105 of the Uniform
Commercial Code).

4.14 Supplements to Schedules and Annexes. The Credit Parties shall, from time to
time (including, without limitation, in connection with any reaffirmation by the Pledgors of the
representations and warranties made by any Pledgor hereunder or under any Financing Document), and
upon the reasonable request of the Agent, amend or supplement in writing and deliver to the Agent
revisions of and supplements to the Annexes and schedules hereto to the extent necessary to
disclose new or changed facts or circumstances arising after the Effective Date, which, if existing
or occurring on such date, would have been required to be set forth or described in such Annex or
schedule hereto; provided that (i) in connection with any amendment or supplement to
Annex A, the Credit Parties shall comply with Section 5.1(b), (ii) in connection with any
amendment or supplement to Annex B, the Credit Parties shall provide the Agent at least
fifteen (15) days’ advance notice of any such amendment or supplement (or such shorter period as
the Agent may approve), shall comply with Section 4.2 and shall take any other action reasonably
requested by Agent in connection therewith to maintain the Lien of Agent on the Collateral after
giving effect to such amendment or supplement, (iii) in connection with any amendment or supplement
to Annex H, the Credit Parties shall provide the Agent at least fifteen (15) days’ advance
notice of any such amendment or supplement (or such shorter period as the Agent may approve), shall
comply with Sections 3.10 and 4.11 and shall take any other action reasonably requested by Agent in
connection therewith to maintain the Lien of Agent on the Collateral after giving effect to such
amendment or supplement, (iv) in connection with any amendment or supplement to Annex C,
the Credit Parties shall comply with Section 4.2, (v) in connection with any amendment or
supplement to Annexes D, E or F, the Credit Parties shall comply
with Section 4.9(a), and (vi) no such amendment or supplement to any such Annex shall constitute a
waiver of any Default or Event of Default in existence on or prior to the date of such amendment or
supplement. Any reference to an Annex or schedule in this Agreement shall refer to such Annex as
amended or supplemented from time to time in accordance with this Section 4.14.

ARTICLE V

CERTAIN PROVISIONS RELATING TO EQUITY INTERESTS

5.1 Ownership; After-Acquired Equity Interests.

(a) Except as otherwise permitted under Section 6.03(c) of the Credit Agreement, each Pledgor
will cause the Equity Interests pledged by it hereunder (including without limitation, all Equity
Interests constituting Deferred Interests which would become Collateral if a Deferred Interests
Triggering Event were to occur) to constitute at all times 100% of the capital stock or other
Equity Interests in each issuer held by such Pledgor thereof, such that the issuer thereof shall be
a wholly owned subsidiary of such Pledgor, provided that (i) in no event shall the Parent
cease to own 100% of the Equity Interests in Enrichment and (ii) if, after giving effect to any
transaction permitted by Sections 6.03(c) of the Credit Agreement, any Equity Interests of any
issuer (other than Enrichment) pledged hereunder are held by any Subsidiary which is not a Pledgor,
the Parent shall cause such Subsidiary to execute and deliver a Pledgor Guaranty and a Pledgor
Addendum pursuant to which such Subsidiary shall become a Pledgor hereunder and grant a first
priority Lien in favor of the Agent on the Collateral of such Subsidiary, including without
limitation, all such Equity Interests. Unless the Agent shall have given its prior written consent,
no Pledgor will cause or permit any such issuer to issue or sell any new capital stock, any
warrants, options or rights to acquire the same, or other Equity Interests of any nature to any
person other than such Pledgor, or cause, permit or consent to the admission of any other person as
a stockholder, partner or member of any such issuer.

(b) If any Pledgor shall, at any time and from time to time (or, in the case of any Equity
Interests constituting Deferred Interests, if any Pledgor shall, at any time and from time to time
from and after the occurrence of a Deferred Interests Triggering Event), acquire any additional
capital stock or other Equity Interests in any person of the types described in the definition of
the term “Equity Interests” (including, without limitation, pursuant to any transaction
permitted by Section 6.03(c) of the Credit Agreement), the same shall be automatically deemed to be
Equity Interests, and shall be deemed to be pledged to the Agent pursuant to Section 2.1 or, in the
case of Equity Interests constituting Deferred Interests, pursuant to Section 2.3, and such Pledgor
will forthwith pledge and deposit the same with the Agent and deliver to the Agent any certificates
or instruments therefor, together with the endorsement of such Pledgor (in the case of any
promissory notes or other Instruments), undated stock powers (in the case of Equity Interests
evidenced by certificates) or other necessary instruments of transfer or assignment, duly executed
in blank and in form and substance satisfactory to the Agent, together with such other certificates
and instruments as the Agent may reasonably request (including Uniform Commercial Code financing
statements or appropriate amendments thereto), and will promptly thereafter deliver to the Agent a
fully completed and duly executed amendment to this Agreement in the form of Exhibit A
(each, a “Pledge Amendment”) in respect thereof. Each Pledgor hereby authorizes the Agent
to attach each such Pledge Amendment to this Agreement, and agrees that all such Collateral listed
on any Pledge Amendment shall for all purposes be deemed Collateral hereunder and shall be subject
to the provisions hereof, provided that the failure of any Pledgor to execute and deliver
any Pledge Amendment with respect to any such additional Collateral as required hereinabove shall
not impair the security interest of the Agent in such Collateral or otherwise adversely affect the
rights and remedies of the Agent hereunder with respect thereto.

(c) If any Equity Interests (whether now owned or hereafter acquired) included in the
Collateral are “uncertificated securities” within the meaning of the Uniform Commercial Code or are
otherwise not evidenced by any certificate or instrument, each applicable Pledgor will promptly
notify the Agent thereof and will promptly take and cause to be taken, and will (if the issuer of
such uncertificated securities is a person other than a direct or indirect subsidiary of the
Parent) use its best efforts to cause the issuer to take, all actions required under Articles 8 and
9 of the Uniform Commercial Code and any other applicable law, to enable the Agent to acquire
“control” (within the meaning of such term under Section 8-106 (or its successor provision) of the
Uniform Commercial Code) of such uncertificated securities and as may be otherwise necessary or
deemed appropriate by the Agent to perfect the security interest of the Agent therein.

5.2 Voting Rights. So long as no Event of Default shall have occurred and be
continuing, each Pledgor shall be entitled to exercise all voting and other consensual rights
pertaining to its Equity Interests (subject to its obligations under Section 5.1) which have become
Collateral, and for that purpose the Agent will execute and deliver or cause to be executed and
delivered to each applicable Pledgor all such proxies and other instruments as such Pledgor may
reasonably request in writing to enable the Pledgor to exercise such voting and other consensual
rights; provided, however, that no Pledgor will cast any vote, give any consent,
waiver or ratification, or take or fail to take any action, in any manner that would, or could
reasonably be expected to, violate or be inconsistent with any of the terms of this Agreement, the
Credit Agreement or any other Financing Document, or have the effect of impairing the position or
interests of the Agent or any other Secured Party in such Collateral.

5.3 Dividends and Other Distributions. So long as no Event of Default shall have
occurred and be continuing (or would occur as a result thereof), and except as provided otherwise
herein or in the Credit Agreement, all interest, income, dividends, distributions and other amounts
payable in cash in respect of the Equity Interests which have become Collateral shall be paid to
and retained by the Pledgors; provided, however, that all such interest, income,
dividends, distributions and other amounts shall, at all times after the occurrence and during the
continuance of an Event of Default, be paid to the Agent and retained by it as part of the
Collateral (except to the extent applied upon receipt to the repayment of the Secured Obligations).
The Agent shall also be entitled at all times (whether or not during the continuance of an Event
of Default) to receive directly, and to retain as part of the Collateral, (i) all interest, income,
dividends, distributions or other amounts paid or payable in cash or other property in respect of
any Equity Interests which have become Collateral in connection with the dissolution, liquidation,
recapitalization or reclassification of the capital of the applicable issuer to the extent
representing an extraordinary, liquidating or other distribution in return of capital, (ii) all
additional Equity Interests or other securities or property (other than cash) paid or payable or
distributed or distributable in respect of any Equity Interests which have become Collateral in
connection with any noncash dividend, distribution, return of capital, spin-off, stock split,
split-up, reclassification, combination of shares or interests or similar rearrangement, and (iii)
without affecting any restrictions against such actions contained in the Credit Agreement, all
additional Equity Interests or other securities or property (including cash) paid or payable or
distributed or distributable in respect of any Equity Interests which have become Collateral in
connection with any consolidation, merger, exchange of securities, liquidation or other
reorganization. All interest, income, dividends, distributions or other amounts that are received
by any Pledgor in violation of the provisions of this Section shall be received in trust for the
benefit of the Agent, shall be segregated from other property or funds of such Pledgor and shall be
forthwith delivered to the Agent as Collateral in the same form as so received (with any necessary
endorsements).

ARTICLE VI

REMEDIES

6.1 Remedies. If an Event of Default shall have occurred and be continuing, the Agent
shall be entitled to exercise in respect of the Collateral all of its rights, powers and remedies
provided for herein or otherwise available to it under any other Financing Document, by law, in
equity or otherwise, including all rights and remedies of a secured party under the Uniform
Commercial Code, and shall be entitled in particular, but without limitation of the foregoing, to
exercise the following rights, which each Pledgor agrees to be commercially reasonable:

(a) To notify any or all account debtors or obligors under any Accounts or other Collateral of
the security interest in favor of the Agent created hereby and to direct all such persons to make
payments of all amounts due thereon or thereunder directly to the Agent or to an account designated
by the Agent; and in such instance and from and after such notice, all amounts and Proceeds
(including wire transfers, checks and other instruments) received by any Pledgor in respect of any
Accounts or other Collateral shall be received in trust for the benefit of the Agent hereunder,
shall be segregated from the other funds of such Pledgor and shall be forthwith deposited into such
account or paid over or delivered to the Agent in the same form as so received (with any necessary
endorsements or assignments), to be held as Collateral and applied to the Secured Obligations as
provided herein;

(b) To take possession of, receive, endorse, assign and deliver, in its own name or in the
name of any Pledgor, all checks, notes, drafts and other instruments relating to any Collateral,
including receiving, opening and properly disposing of all mail addressed to any Pledgor concerning
Accounts and other Collateral and to notify the appropriate postal authority to change the mailing
or delivery address of such mail; to verify with account debtors or other contract parties the
validity, amount or any other matter relating to any Accounts or other Collateral, in its own name
or in the name of any Pledgor; to accelerate any indebtedness or other obligation constituting
Collateral that may be accelerated in accordance with its terms; to take or bring all actions and
suits deemed necessary or appropriate to effect collections and to enforce payment of any Accounts
or other Collateral; to settle, compromise or release in whole or in part any amounts owing on
Accounts or other Collateral; and to extend the time of payment of any and all Accounts or other
amounts owing under any Collateral and to make allowances and adjustments with respect thereto, all
in the same manner and to the same extent as any Pledgor might have done;

(c) To originate instructions to any or all depository institutions with which any Deposit
Accounts are maintained and any or all securities intermediaries with which any Securities Accounts
are maintained, including without limitation, instructions to terminate the Pledgors’ access to
such Deposit Accounts or Securities Accounts and instructions to remit and transfer all monies,
securities and other property on deposit in such Deposit Accounts or Securities Accounts or
deposited or received for deposit thereafter to the Agent, for deposit in a Collateral Account or
such other accounts as may be designated by the Agent, for application to the Secured Obligations
as provided herein;

(d) Subject to applicable law and regulation, to transfer to or register in its name or the
name of any of its agents or nominees all or any part of the Collateral, without notice to any
Pledgor and with or without disclosing that such Collateral is subject to the security interest
created hereunder;

(e) Subject to applicable law and regulation, to require any Pledgor to, and each Pledgor
hereby agrees that it will at its expense and upon request of the Agent forthwith, assemble all or
any part of the Collateral as directed by the Agent and to the extent permitted by applicable law
make it available to the Agent at a place designated by the Agent and each Pledgor further agrees
that the Agent shall have no obligation to clean-up or otherwise prepare the Collateral for sale;

(f) To the extent permitted by applicable law, to enter and remain upon the premises of any
Pledgor and take possession of all or any part of the Collateral, with or without judicial process;
to use the materials, services, books and records of any Pledgor for the purpose of liquidating or
collecting the Collateral, whether by foreclosure, auction or otherwise; and to remove the same to
the premises of the Agent or any designated agent for such time as the Agent may desire, in order
to effectively collect or liquidate the Collateral;

(g) Subject to applicable law and regulation, to exercise, but only at the request of Required
Lenders, to the extent permitted by applicable law, (i) all voting, consensual and other rights and
powers pertaining to the Equity Interests (whether or not transferred into the name of the Agent),
at any meeting of shareholders, partners, members or otherwise, and (ii) any and all rights of
conversion, exchange, subscription and any other rights, privileges or options pertaining to the
Equity Interests as if it were the absolute owner thereof (including, without limitation, the right
to exchange at its discretion any and all of the Equity Interests upon the merger, consolidation,
reorganization, reclassification, combination of shares or interests, similar rearrangement or
other similar fundamental change in the structure of the applicable issuer, or upon the exercise by
any Pledgor or the Agent of any right, privilege or option pertaining to such Equity Interests),
and in connection therewith, the right to deposit and deliver any and all of the Equity Interests
with any committee, depositary, transfer agent, registrar or other designated agency upon such
terms and conditions as the Agent may determine, and give all consents, waivers and ratifications
in respect of the Equity Interests, all without liability except to account for any property
actually received by it, but the Agent shall have no duty to exercise any such right, privilege or
option or give any such consent, waiver or ratification and shall not be responsible for any
failure to do so or delay in so doing; and for the foregoing purposes each Pledgor will promptly
execute and deliver or cause to be executed and delivered to the Agent, upon request, all such
proxies and other instruments as the Agent may reasonably request to enable the Agent to exercise
such rights and powers; AND IN FURTHERANCE OF THE FOREGOING AND WITHOUT LIMITATION THEREOF, EACH
PLEDGOR HEREBY IRREVOCABLY CONSTITUTES AND APPOINTS THE AGENT AS THE TRUE AND LAWFUL PROXY AND
ATTORNEY-IN-FACT OF SUCH PLEDGOR, WITH FULL POWER OF SUBSTITUTION IN THE PREMISES, UPON THE
OCCURRENCE AND DURING THE CONTINUANCE OF AN EVENT OF DEFAULT, TO EXERCISE ALL SUCH VOTING,
CONSENSUAL AND OTHER RIGHTS AND POWERS TO WHICH ANY HOLDER OF ANY EQUITY INTERESTS WOULD BE
ENTITLED BY VIRTUE OF HOLDING THE SAME, WHICH PROXY AND POWER OF ATTORNEY, BEING COUPLED WITH AN
INTEREST, IS IRREVOCABLE AND SHALL BE EFFECTIVE FOR SO LONG AS THIS AGREEMENT SHALL BE IN EFFECT.
Each of Enrichment, NAC Holding and NAC International agrees that, notwithstanding anything to the
contrary set forth in Article V, Section 6 of its bylaws, it will recognize the security interest
and the rights and remedies of the Agent under this Agreement, including without limitation, the
right of the Agent to exercise the remedies set forth in Sections 6.1(d) and (h) and in this
Section 6.1(g) upon the occurrence and during the continuance of an Event of Default; and

(h) Subject to applicable law and regulation, to sell, resell, assign and deliver, in its sole
discretion, all or any of the Collateral, in one or more parcels, on any securities exchange on
which any Equity Interests may be listed, at public or private sale, at any of the Agent’s offices
or elsewhere, for cash, upon credit or for future delivery, at such time or times and at such price
or prices and upon such other terms as the Agent may deem satisfactory. If any of the Collateral
is sold by the Agent upon credit or for future delivery, the Agent shall not be liable for the
failure of the purchaser to purchase or pay for the same and, in the event of any such failure, the
Agent may resell such Collateral. In no event shall any Pledgor be credited with any part of the
Proceeds of sale of any Collateral until and to the extent cash payment in respect thereof has
actually been received by the Agent. Each purchaser at any such sale shall hold the property sold
absolutely, free from any claim or right of whatsoever kind, including any equity or right of
redemption of any Pledgor, and each Pledgor hereby expressly waives, to the fullest extent
permitted under applicable law, all rights of redemption, stay or appraisal, and all rights to
require the Agent to marshal any assets in favor of such Pledgor or any other party or against or
in payment of any or all of the Secured Obligations, that it has or may have under any rule of law
or statute now existing or hereafter adopted. No demand, presentment, protest, advertisement or
notice of any kind (except any notice required by law, as referred to below), all of which are
hereby expressly waived by each Pledgor, shall be required in connection with any sale or other
disposition of any part of the Collateral. If any notice of a proposed sale or other disposition
of any part of the Collateral shall be required under applicable law, the Agent shall give the
applicable Pledgor at least ten (10) days’ prior notice of the time and place of any public sale
and of the time after which any private sale or other disposition is to be made, which notice each
Pledgor agrees is commercially reasonable. The Agent shall not be obligated to make any sale of
Collateral if it shall determine not to do so, regardless of the fact that notice of sale may have
been given. The Agent may, without notice or publication, adjourn any public or private sale or
cause the same to be adjourned from time to time by announcement at the time and place fixed for
sale, and such sale may, without further notice, be made at the time and place to which the same
was so adjourned. Upon each public sale and, to the extent permitted by applicable law, upon each
private sale, the Agent may purchase all or any of the Collateral being sold, free from any equity,
right of redemption or other claim or demand, and may make payment therefor by endorsement and
application (without recourse) of the Secured Obligations in lieu of cash as a credit on account of
the purchase price for such Collateral. The Agent shall, to the extent required by applicable
laws, comply with any applicable state or federal law requirements in connection with the sale or
other disposition of the Collateral and each Pledgor agrees that such compliance is commercially
reasonable. The Agent may sell or otherwise dispose of the Collateral without giving any
warranties, specifically disclaiming any warranties of title or the like and each Pledgor agrees
that such disclaimer is commercially reasonable.

Notwithstanding anything to the contrary set forth herein, in no event shall, by virtue of this
Agreement, any person or entity that is a “foreign person” or a “contravening person,” in each
case, as defined below, (i) have any beneficial ownership interest in, or control of, any Equity
Interests in Enrichment (or its successor) or (ii) exercise any rights and remedies hereunder with
respect to the Equity Interests in Enrichment (or its successor) (x) that is inconsistent with or
in violation of the regulations, rules or restrictions of any Governmental Authority that exercises
regulatory power over Enrichment, its business, operations or assets or (y) that could jeopardize
Enrichment’s continued operations, including, without limitation, pursuant to licenses issued by
any Governmental Authority. For purposes of this paragraph, “foreign person” shall mean (i) an
individual who is not a citizen of the United States of America; (ii) a partnership in which any
general partner is a foreign person or the partner or partners having a majority interest in
partnership profits are foreign persons; (iii) a foreign government or representative thereof; (iv)
a corporation, partnership, trust, company, association or other entity organized or incorporated
under the laws of a jurisdiction outside of the United States and (v) a corporation, partnership,
trust, company, association or other entity that is controlled, directly or indirectly, by any one
or more of the foregoing. For purposes of this paragraph, “contravening person” shall mean (i) any
person or entity incorporated, organized or having its principal place of business outside of the
United States that is in the business of (x) enriching uranium for use by nuclear reactors or (y)
creating a fissile product capable of use as a fuel source for nuclear reactors in lieu of enriched
uranium or (ii) any Affiliate of any person or entity described in clause (i) of this definition;
or (iii) any person or entity having a significant commercial relationship with any person or
entity described in clauses (i) or (ii) of this definition.

6.2 Application of Proceeds.

(a) All Proceeds collected by the Agent upon any sale, other disposition of or realization
upon any of the Collateral, together with all other moneys received by the Agent hereunder
following the occurrence and during the continuance of an Event of Default and acceleration of the
Loan by the Agent pursuant to the Credit Agreement, shall be applied as follows:

FIRST, to the Issuing Bank to reimburse the Issuing Bank for that portion of the
payments, if any, made by it with respect to Letters of Credit for which the Borrowers have
failed to reimburse the Issuing Bank as required pursuant to Section 2.04 of the Credit
Agreement (it being understood that the Issuing Bank will promptly distribute to the Agent
and the Agent will promptly distribute to each Lender which has reimbursed the Issuing Bank
for its pro rata share of any such payment which was not reimbursed by the Borrowers such
Lender’s pro rata share of the Proceeds so applied by the Issuing Bank pursuant to this
clause FIRST);

SECOND, to the payment of all reasonable costs and expenses incurred by the Agent in
connection with such collection or sale or otherwise in connection with this Agreement or
any of the Secured Obligations, including, but not limited to, those under Section 8.1, all
court costs and the reasonable fees and expenses of its agents and legal counsel, the
repayment of all advances made by the Agent hereunder on behalf of the Pledgors and any
other reasonable costs or expenses incurred in connection with the exercise of any right or
remedy hereunder;

THIRD, to the Agent to be held as cash collateral to the extent of the undrawn amounts,
if any, of outstanding Letters of Credit;

FOURTH, pro rata to the payment in full of principal and interest in respect of any
Loans outstanding (pro rata as among the Lenders in accordance with the amounts of the Loans
made by them pursuant to the Credit Agreement);

FIFTH, pro rata to the payment in full of all unpaid monetary obligations of any
Pledgor to a Secured Party in respect of Banking Services Obligations and Derivative
Obligations;

SIXTH, pro rata to the payment in full of all Secured Obligations (other than those
referred to above) owed to the Secured Parties (pro rata as among the Secured Parties in
accordance with the amount of the Secured Obligations owed to them on the date of any such
distribution);

SEVENTH, to the Pledgors, their successors and assigns, or as a court of competent
jurisdiction may otherwise direct;

provided, however, that notwithstanding anything herein to the contrary, the
Agent’s and the other Secured Parties’ rights to sell or otherwise dispose of the Collateral shall
cease upon payment in full of the amounts set forth in items “FIRST” through “SIXTH” above.

(b) For purposes of applying amounts in accordance with this Section, the Agent shall be
entitled to rely upon any Secured Party that has entered into a Derivative Obligation with any
Pledgor or provided any cash management services to any Pledgor for a determination (which such
Secured Party agrees to provide or cause to be provided upon request of the Agent) of the
outstanding Derivative Obligations or Banking Services Obligations owed to such Secured Party.
Unless it has actual knowledge (including by way of written notice from any such Secured Party) to
the contrary, the Agent, in acting hereunder, shall be entitled to assume that no Derivative
Obligations or Banking Services Obligations or Secured Obligations in respect thereof are in
existence between any Secured Party and any Pledgor.

(c) Each Pledgor shall remain liable to the extent of any deficiency between the amount of all
Proceeds realized upon sale, other disposition or collection of the Collateral, and monies held as
Collateral pursuant to this Agreement and the aggregate amount of Secured Obligations. Upon any
sale of any Collateral hereunder by the Agent (whether by virtue of the power of sale herein
granted, pursuant to judicial proceeding, or otherwise), the receipt by the Agent or the officer
making the sale shall be a sufficient discharge to the purchaser or purchasers of the Collateral so
sold, and such purchaser or purchasers shall not be obligated to see to the application of any part
of the purchase money paid over to the Agent or such officer or be answerable in any way for the
misapplication thereof.

6.3 Collateral Accounts. Upon the occurrence and during the continuance of an Event
of Default, the Agent shall have the right to cause to be established and maintained, at its
principal office or such other location or locations as it may establish from time to time in its
discretion, one or more accounts (collectively, “Collateral Accounts”) for the collection
of cash Proceeds of the Collateral. Such Proceeds, when deposited, shall continue to constitute
Collateral for the Secured Obligations and shall not constitute payment thereof until applied as
herein provided. The Agent shall have sole dominion and control over all funds deposited in any
Collateral Account, and such funds may be withdrawn therefrom only by the Agent. Upon the
occurrence and during the continuance of an Event of Default, the Agent shall have the right to
(and, if directed by the Required Lenders pursuant to the Credit Agreement, shall) apply amounts
held in the Collateral Accounts in payment of the Secured Obligations in the manner provided for in
Section 6.2. Collateral Accounts shall be promptly liquidated and all monies credited thereto
shall be paid over to the Pledgor(s) once the Secured Obligations have been paid or reimbursed in
full or cash collateralized. Thereafter, cash proceeds of Collateral need not be paid into
Collateral Accounts unless and until another Loan or Letter of Credit is requested.

6.4 Grant of License. To the extent permitted by applicable law and solely for the
purpose of enabling the Secured Parties to exercise rights and remedies under Article VI, and at
such time as the Secured Parties shall be lawfully entitled to exercise such rights and remedies,
each Pledgor hereby grants to the Agent, to the extent it has the right to do so, an irrevocable,
non-exclusive license (exercisable without payment of royalty or other compensation to any
Pledgor), subject, in the case of Trademarks, to sufficient rights to quality control and
inspection in favor of each Pledgor to avoid the risk of invalidation of such Trademarks, to use,
license or sublicense any Patent Collateral, Trademark Collateral or Copyright Collateral now owned
or hereafter acquired by such Pledgor, wherever the same may be located throughout the world, for
such term or terms, on such conditions and in such manner as the Agent shall determine, whether
general, special or otherwise, and whether on an exclusive or nonexclusive basis, and including in
such license reasonable access to all media in which any of the licensed items may be recorded or
stored and to all computer software and programs used for the compilation or printout thereof. The
use of such license or sublicense by the Agent shall be exercised, at the option of the Agent, and
only upon the occurrence and during the continuation of an Event of Default; provided that
any license, sublicense or other transaction entered into by the Agent in accordance herewith shall
be binding upon each applicable Pledgor notwithstanding any subsequent cure of an Event of Default.

6.5 Private Sales.

(a) Each Pledgor recognizes that, by reason of certain prohibitions contained in the
Securities Act and applicable state securities laws as in effect from time to time, the Agent may
be compelled, with respect to any sale of all or any part of the Equity Interests conducted without
registration or qualification under the Securities Act and such state securities laws, to limit
purchasers to any one or more persons who will represent and agree, among other things, to acquire
such Equity Interests for their own account, for investment and not with a view to the distribution
or resale thereof. Each Pledgor acknowledges that any such private sales may be made in such
manner and under such circumstances as the Agent may deem necessary or advisable in its sole and
absolute discretion, including at prices and on terms less favorable than those obtainable through
a public sale without such restrictions (including, without limitation, a public offering made
pursuant to a registration statement under the Securities Act), and, notwithstanding such
circumstances, agrees that any such private sale shall be deemed to have been made in a
commercially reasonable manner and agrees that the Agent shall have no obligation to conduct any
public sales and no obligation to delay the sale of any Equity Interests for the period of time
necessary to permit its registration for public sale under the Securities Act and applicable state
securities laws, and shall not have any responsibility or liability as a result of its election so
not to conduct any such public sales or delay the sale of any Equity Interests, notwithstanding the
possibility that a substantially higher price might be realized if the sale were deferred until
after such registration. Each Pledgor hereby waives any claims against the Agent or any other
Secured Party arising by reason of the fact that the price at which any Equity Interests may have
been sold at any private sale was less than the price that might have been obtained at a public
sale or was less than the aggregate amount of the Secured Obligations, even if the Agent accepts
the first offer received and does not offer such Equity Interests to more than one offeree.

(b) Each Pledgor agrees that a breach of any of the covenants contained in this Section will
cause irreparable injury to the Agent and the other Secured Parties, that the Agent and the other
Secured Parties have no adequate remedy at law in respect of such breach and, as a consequence,
that each and every covenant contained in this Section shall be specifically enforceable against
the Pledgors.

6.6 Waivers. Each Pledgor, to the greatest extent not prohibited by applicable law,
hereby (i) agrees that it will not invoke, claim or assert the benefit of any rule of law or
statute now or hereafter in effect (including, without limitation, any right to prior notice or
judicial hearing in connection with the Agent’s possession, custody or disposition of any
Collateral or any appraisal, valuation, stay, extension, moratorium or redemption law), or take or
omit to take any other action, that would or could reasonably be expected to have the effect of
delaying, impeding or preventing the exercise of any rights and remedies in respect of the
Collateral, the absolute sale of any of the Collateral or the possession thereof by any purchaser
at any sale thereof, and waives the benefit of all such laws and further agrees that it will not
hinder, delay or impede the execution of any power granted hereunder to the Agent, but that it will
permit the execution of every such power as though no such laws were in effect, (ii) waives all
rights that it has or may have under any rule of law or statute now existing or hereafter adopted
to require the Agent to marshal any Collateral or other assets in favor of such Pledgor or any
other party or against or in payment of any or all of the Secured Obligations, and (iii) waives all
rights that it has or may have under any rule of law or statute now existing or hereafter adopted
to demand, presentment, protest, advertisement or notice of any kind (except notices expressly
provided for herein or in the other Financing Documents) or to require the Agent to pursue any
third party for any of the Secured Obligations.

ARTICLE VII

THE AGENT

7.1 The Agent; Standard of Care. The Agent will hold all items of the Collateral at
any time received under this Agreement in accordance with the provisions hereof and the other
Financing Documents. The obligations of the Agent as holder of the Collateral and interests
therein and with respect to the disposition thereof, and otherwise under this Agreement and the
other Financing Documents, are only those expressly set forth in this Agreement and the other
Financing Documents. The Agent, to the extent required under the Credit Agreement, shall act
hereunder at the direction, or with the consent, of the Required Lenders on the terms and
conditions set forth in the Credit Agreement. The powers conferred on the Agent hereunder are
solely to protect its interest, on behalf of the Secured Parties, in the Collateral, and shall not
impose any duty upon it to exercise any such powers. Except for treatment of the Collateral in its
possession in the same manner as that which the Agent, in its individual capacity, accords its own
property of a similar nature for its own account, and the accounting for moneys actually received
by it hereunder, the Agent shall have no duty as to any Collateral or as to the taking of any
necessary steps to preserve rights against prior parties or any other rights pertaining to the
Collateral. Neither the Agent nor any other Secured Party shall be liable to any Pledgor (i) for
any loss or damage sustained by such Pledgor, or (ii) for any loss, damage, depreciation or other
diminution in the value of any of the Collateral that may occur as a result of or in connection
with or that is in any way related to any exercise by the Agent or any other Secured Party of any
right or remedy under this Agreement, any failure to demand, collect or realize upon any of the
Collateral or any delay in doing so, or any other act or failure to act on the part of the Agent or
any other Secured Party, except to the extent that the same is caused by its own gross negligence
or willful misconduct.

7.2 Further Assurances; Attorney-in-Fact.

(a) Each Pledgor hereby authorizes the Agent to sign (to the extent the Pledgor’s signature is
required thereon) and file financing statements and amendments thereto relating to all or any part
of the Collateral without the signature of such Pledgor (including, without limitation, making any
notice filings with state tax or revenue authorities required to be made by account creditors in
order to enforce any Accounts in such state); provided that, promptly following the filing
thereof, the Agent shall provide the Pledgors with a copy of any initial financing statement filed
by the Agent or any amendment to any initial financing statement which changes the collateral
description set forth therein; provided, further, that the Agent’s failure to do so shall
not impair or limit the validity or effectiveness of any such initial financing statement or
amendment. The Pledgor further agrees to execute and deliver to the Agent such additional
conveyances, assignments, agreements and instruments as the Agent may reasonably require under
applicable law to perfect, establish, confirm and maintain the security interest and Lien provided
for herein, to carry out the purposes of this Agreement or to further assure and confirm unto the
Agent its rights, powers and remedies hereunder.

(b) Each Pledgor hereby irrevocably appoints the Agent its lawful attorney-in-fact, with full
authority in the place and stead of such Pledgor and in the name of such Pledgor, the Agent or
otherwise, and with full power of substitution in the premises (which power of attorney, being
coupled with an interest, is irrevocable for so long as this Agreement shall be in effect), from
time to time in the Agent’s discretion after the occurrence and during the continuance of an Event
of Default (except for the actions described in clause (vii) below which may be taken by the Agent
without regard to whether an Event of Default has occurred) to take any action and to execute any
instruments that the Agent may deem necessary or advisable to accomplish the purpose of this
Agreement, including, without limitation:

(i) to ask, demand, collect, sue for, recover, compound, receive and give
acquittance and receipts for moneys due and to become due under or in respect of any
of the Collateral;

(ii) to receive, endorse and collect any checks, drafts, instruments, chattel
paper and other orders for the payment of money made payable to such Pledgor
representing any interest, income, dividend, distribution or other amount payable in
respect of any of the Collateral and to give full discharge for the same;

(iii) to obtain, maintain and adjust any property or casualty insurance
required to be maintained by such Pledgor under Section 4.8 and direct the payment
of proceeds thereof to the Agent;

(iv) to pay or discharge taxes, Liens or other encumbrances levied or placed on
or threatened against the Collateral, the legality or validity thereof and the
amounts necessary to discharge the same to be determined by the Agent in its sole
discretion, any such payments made by the Agent to become Secured Obligations of the
Pledgors to the Agent, due and payable immediately and without demand;

(v) to file any claims or take any action or institute any proceedings that the
Agent may deem necessary or advisable for the collection of any of the Collateral or
otherwise to enforce the rights of the Agent with respect to any of the Collateral;

(vi) to use, sell, assign, transfer, pledge, make any agreement with respect to
or otherwise deal with any and all of the Collateral as fully and completely as
though the Agent were the absolute owner of the Collateral for all purposes, and to
do from time to time, at the Agent’s option and the Pledgors’ expense, all other
acts and things deemed necessary by the Agent to protect, preserve or realize upon
the Collateral and to more completely carry out the purposes of this Agreement; and

(vii) to sign the name of such Pledgor on (to the extent the Pledgor’s
signature is required thereon) and to file any financing statement, continuation
statement, notice or other similar document that, in the Agent’s Permitted
Discretion, should be made or filed in order to perfect or continue to perfect the
security interest granted under this Agreement;

(c) If any Pledgor fails to perform any covenant or agreement contained in this Agreement
after written request to do so by the Agent (provided that no such request shall be
necessary at any time after the occurrence and during the continuance of an Event of Default), the
Agent may itself perform, or cause the performance of, such covenant or agreement and may take any
other action that it deems necessary and appropriate for the maintenance and preservation of the
Collateral or its security interest therein, and the reasonable expenses so incurred in connection
therewith shall be payable by the Pledgors under Section 8.1.

ARTICLE VIII

MISCELLANEOUS

8.1 Indemnity and Expenses. The Pledgors agree jointly and severally:

(a) to indemnify and hold harmless the Agent, each other Secured Party and each of their
respective directors, officers, employees, agents and affiliates from and against any and all
claims, damages, demands, losses, obligations, judgments and liabilities (including, without
limitation, reasonable attorneys’ fees and expenses) in any way arising out of or in connection
with this Agreement, except to the extent the same shall arise as a result of the gross negligence
or willful misconduct of the party seeking to be indemnified; and

(b) to pay and reimburse the Agent upon demand for all reasonable costs and expenses
(including, without limitation, reasonable attorneys’ fees and expenses) that the Agent may incur
in connection with (i) the custody, use or preservation of, or the sale of, collection from or
other realization upon, any of the Collateral, including the reasonable expenses of retaking,
holding, preparing for sale or lease, selling or otherwise disposing of or realizing on the
Collateral, (ii) the exercise or enforcement of any rights or remedies granted hereunder
(including, without limitation, under Article VI), under any of the other Financing Documents or
otherwise available to it (whether at law, in equity or otherwise), or (iii) the failure by any
Pledgor to perform or observe any of the provisions hereof. The provisions of this Section shall
survive the execution and delivery of this Agreement, the repayment of any of the Secured
Obligations, the termination or expiration of all Letters of Credit under the Credit Agreement, the
termination of the Commitments under the Credit Agreement and the termination of this Agreement or
any other Financing Document.

8.2 No Waiver. The rights and remedies of the Secured Parties expressly set forth in
this Agreement and the other Financing Documents are cumulative and in addition, to, and not
exclusive of, all other rights and remedies available at law, in equity or otherwise. No failure
or delay on the part of any Secured Party in exercising any right, power or privilege shall operate
as a waiver thereof, nor shall any single or partial exercise of any such right, power or privilege
preclude any other or further exercise thereof or the exercise of any other right, power or
privilege or be construed to be a waiver of any Default or Event of Default. No course of dealing
between the Pledgors and the Secured Parties or their agents or employees shall be effective to
amend, modify or discharge any provision of this Agreement or any other Financing Document or to
constitute a waiver of any Default or Event of Default. No notice to or demand upon any Pledgor in
any case shall entitle such Pledgor or any other Pledgor to any other or further notice or demand
in similar or other circumstances or constitute a waiver of the right of any Secured Party to
exercise any right or remedy or take any other or further action in any circumstances without
notice or demand.

8.3 Pledgors’ Obligations Absolute. Until such time as this Agreement terminates
pursuant to Section 8.6, each Pledgor agrees that its obligations hereunder, and the security
interest granted to and all rights, remedies and powers of the Agent hereunder, are irrevocable,
absolute and unconditional and shall not be discharged, limited or otherwise affected (unless
agreed to by the parties hereto) by reason of any of the following, whether or not such Pledgor has
knowledge thereof:

(i) any change in the time, manner or place of payment of, or in any other term
of, any Secured Obligations, or any amendment, modification or supplement to,
restatement of, or consent to any rescission or waiver of or departure from, any
provisions of the Credit Agreement, any Pledgor Guaranty, any other Loan Document or
any agreement or instrument delivered pursuant to any of the foregoing;

(ii) the invalidity or unenforceability of any Secured Obligations or any
provisions of the Credit Agreement, any Pledgor Guaranty, any other Financing
Document or any agreement or instrument delivered pursuant to any of the foregoing;

(iii) the addition or release of Pledgors hereunder or the taking, acceptance
or release of any Secured Obligations or additional Collateral or other security
therefor;

(iv) any sale, exchange, release, substitution, compromise, nonperfection or
other action or inaction in respect of any Collateral or other direct or indirect
security for any Secured Obligations, or any discharge, modification, settlement,
compromise or other action or inaction in respect of any Secured Obligations;

(v) any agreement not to pursue or enforce or any failure to pursue or enforce
(whether voluntarily or involuntarily as a result of operation of law, court order
or otherwise) any right or remedy in respect of any Secured Obligations or any
Collateral or other security therefor, or any failure to create, protect, perfect,
secure, insure, continue or maintain any Liens in any such Collateral or other
security;

(vi) the exercise of any right or remedy available under the Financing
Documents, at law, in equity or otherwise in respect of any Collateral or other
security for any Secured Obligations, in any order and by any manner thereby
permitted, including, without limitation, foreclosure on any such Collateral or
other security by any manner of sale thereby permitted, whether or not every aspect
of such sale is commercially reasonable;

(vii) any bankruptcy, reorganization, arrangement, liquidation, insolvency,
dissolution, termination, reorganization or like change in the corporate structure
or existence of the Borrower, any other Pledgor or any other person directly or
indirectly liable for any Secured Obligations;

(viii) any manner of application of any payments by or amounts received or
collected from any person, by whomsoever paid and howsoever realized, whether in
reduction of any Secured Obligations or any other obligations of the Borrowers or
any other person directly or indirectly liable for any Secured Obligations,
regardless of what Secured Obligations may remain unpaid after any such application;
or

(ix) any other circumstance that might otherwise constitute a legal or
equitable discharge of, or a defense, set-off or counterclaim available to, the
Borrowers, any Pledgor or a surety or guarantor generally, other than the occurrence
of all of the following: (x) the payment in full of the Secured Obligations, (y)
the termination or expiration of all Letters of Credit under the Credit Agreement
and (z) the termination of the Commitments under the Credit Agreement (the events in
clauses (x), (y) and (z) above, collectively, the “Termination
Requirements”).

8.4 Enforcement. By its acceptance of the benefits of this Agreement, each Secured
Party agrees that this Agreement may be enforced only by the Agent, acting upon the instructions or
with the consent of the Lenders to the extent provided for in the Credit Agreement, and that no
Secured Party shall have any right individually to enforce or seek to enforce this Agreement or to
realize upon any Collateral or other security given to secure the payment and performance of the
Secured Obligations.

8.5 Amendments, Waivers, etc. No amendment, modification, waiver, discharge or
termination of, or consent to any departure by any Pledgor from, any provision of this Agreement,
shall be effective unless in a writing executed and delivered in accordance with Section 9.02 of
the Credit Agreement, and then the same shall be effective only in the specific instance and for
the specific purpose for which given.

8.6 Continuing Security Interest; Term; Successors and Assigns; Assignment;
Termination and Release; Survival. This Agreement shall create a continuing security
interest in the Collateral and shall secure the payment and performance of all of the Secured
Obligations as the same may arise and be outstanding at any time and from time to time from and
after the date hereof, and shall (i) remain in full force and effect until the occurrence of the
Termination Requirements, (ii) be binding upon and enforceable against each Pledgor and its
successors and assigns (provided, however, that no Pledgor may sell, assign or
transfer any of its rights, interests, duties or obligations hereunder without the prior written
consent of the Lenders) and (iii) inure to the benefit of and, subject to Section 8.4, be
enforceable by each Secured Party and its successors and assigns. Upon any sale or other
disposition by any Pledgor of any Collateral in a transaction expressly permitted hereunder or
under or pursuant to the Credit Agreement or any other applicable Financing Document, or any
amendment or waiver hereunder or thereunder, the Lien and security interest created by this
Agreement in and upon such Collateral shall be automatically released, upon any Pledgor ceasing to
be a Guarantor pursuant to a transaction so permitted, the Lien and security interest created by
this Agreement in any Collateral of such Pledgor shall be automatically released and upon the
satisfaction of all of the Termination Requirements, this Agreement and the Lien and security
interest created hereby shall terminate; and in connection with any such release or termination,
the Agent, at the request and expense of the applicable Pledgor, will execute and deliver to such
Pledgor such documents and instruments evidencing such release or termination as such Pledgor may
reasonably request and will assign, transfer and deliver to such Pledgor, without recourse and
without representation or warranty, such of the Collateral as may then be in the possession of the
Agent (or, in the case of any partial release of Collateral, such of the Collateral so being
released as may be in its possession). All representations, warranties, covenants and agreements
herein shall survive the execution and delivery of this Agreement and any Pledge Amendment or
Pledgor Addendum.

8.7 Additional Pledgors. Each Pledgor recognizes that the provisions of the Credit
Agreement require persons that become direct or indirect subsidiaries of the Parent (other than a
Foreign Subsidiary), and that are not already parties hereto, to execute and deliver a Pledgor
Addendum, whereupon each such Person shall become a Pledgor hereunder with the same force and
effect as if originally a Pledgor hereunder on the date hereof, and agrees that its obligations
hereunder shall not be discharged, limited or otherwise affected by reason of the same, or by
reason of the Agent’s actions in effecting the same or in releasing any Pledgor hereunder, in each
case without the necessity of giving notice to or obtaining the consent of such Pledgor or any
other Pledgor.

8.8 Notices. All notices and other communications provided for hereunder shall be
given to the parties in the manner and subject to the other notice provisions set forth in (i) in
the case of the Borrowers or the Agent, the Credit Agreement and (ii) in the case of any other
Pledgor, its Pledgor Guaranty.

8.9 Applicable Law. THIS AGREEMENT, IN ACCORDANCE WITH SECTION 5-1401 OF THE GENERAL
OBLIGATION LAW OF THE STATE OF NEW YORK, SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE
LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO ANY CONFLICTS OF LAWS PRINCIPLES THEREOF THAT WOULD
CALL FOR THE APPLICATION OF THE LAWS OF ANY OTHER JURISDICTION.

8.10 Severability. To the extent any provision of this Agreement is prohibited by or
invalid under the applicable law of any jurisdiction, such provision shall be ineffective only to
the extent of such prohibition or invalidity and only in such jurisdiction, without prohibiting or
invalidating such provision in any other jurisdiction or the remaining provisions of this Agreement
in any jurisdiction.

8.11 Construction. The headings of the various sections and subsections of this
Agreement have been inserted for convenience only and shall not in any way affect the meaning or
construction of any of the provisions hereof. Unless the context otherwise requires, words in the
singular include the plural and words in the plural include the singular.

8.12 Counterparts. This Agreement may be executed in counterparts (and by different
parties hereto on different counterparts), each of which shall constitute an original but all of
which when taken together shall constitute but one contract, and shall become effective when copies
hereof which, when taken together, bear the signatures of each of the parties hereto shall be
delivered to the Agent. Delivery of an executed counterpart of a signature page to this Agreement
by telecopier shall be effective as delivery of a manually executed signature page hereto.

8.13 Submission to Jurisdiction. Any legal action or proceeding with respect to this
Agreement may be brought in the courts of the State of New York or of the United States of America
for the Southern District of New York, and, by execution and delivery of this Agreement, each
Pledgor hereby submits for itself and in respect of its property, generally and unconditionally, to
the jurisdiction of the aforesaid courts, waives any objection, including, without limitation, any
objection to the laying of venue or based on the grounds of forum non conveniens, which such
Pledgor now or hereafter has to the bringing of any such action or proceeding in such respective
jurisdictions and consents to the service of process of any of the aforementioned courts in any
such action or proceeding by the mailing of copies thereof by registered or certified mail, postage
prepaid, to each such person, as the case may be, as provided for in Section 8.8. The Agent may
also serve process in any other manner permitted by law or commence legal proceedings or otherwise
proceed against any Pledgor in any other jurisdiction.

8.14 WAIVER OF JURY TRIAL. EACH PARTY HERETO HEREBY WAIVES, TO THE FULLEST EXTENT
PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY IN ANY LEGAL PROCEEDING
DIRECTLY OR INDIRECTLY ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS
CONTEMPLATED HEREBY (WHETHER BASED ON CONTRACT, TORT OR ANY OTHER THEORY). EACH PARTY HERETO (A)
CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY
OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE
FOREGOING WAIVER AND (B) ACKNOWLEDGES THAT IT AND THE OTHER PARTIES HERETO HAVE BEEN INDUCED TO
ENTER INTO THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS
SECTION.

8.15 Qualifications Regarding Pledgor Disclosures. Notwithstanding anything to the
contrary set forth herein, in no event shall any Pledgor be required to provide in any annex,
exhibit or schedule hereto, or in response to any disclosure required hereunder, any information
that is “classified” for reasons of national security or foreign policy under applicable laws, and
each of the Pledgors’ representations and warranties hereunder and the annexes, exhibits and
schedules hereto are so qualified.

8.16 Certain Regulatory Restrictions. Notwithstanding anything to the contrary set
forth herein, certain rights, remedies and powers provided the Agent in this Agreement, such as (a)
actions by the Agent that would constitute a direct or indirect transfer of control of one or more
Permits (as defined below), within the meaning of Section 184 of the Atomic Energy Act of 1954, as
amended, and (b) actions (other than acquiring title or ownership to Inventory by foreclosure or
otherwise pursuant to existing general licenses from the NRC issued to and generally available for
use by any person) that involve taking possession or controlling the use of nuclear materials or
facilities for which a Permit is required, are subject to regulatory restrictions that may require
the Agent to obtain the prior written consent or approval of the NRC, and all provisions of this
Security Agreement shall be limited to conform with such restrictions. For purposes hereof,
“Permits” means permits, licenses, certificates, approvals and other authorizations issued by the
NRC, or by a state agency exercising NRC’s authority under an agreement with the NRC.

8.17 Restatement. As of the date hereof, the terms conditions, agreements, covenants,
representations and warranties set forth in the Existing Security Agreement are hereby amended,
restated, replaced and superseded in their entirety by this Agreement, provided that
nothing herein shall impair or adversely affect the continuation of the liability and obligations
of the Pledgors under the Existing Security Agreement, as amended and restated hereby, and nothing
herein shall be construed to constitute payment of, or impair, limit, cancel or extinguish, or
constitute a novation in respect of, the obligations and liabilities of the Pledgors arising under
the Existing Security Agreement, as amended and restated hereby, and the liens and security
interests in favor of the Agent under the Existing Security Agreement shall not in any manner be
impaired, limited, terminated, waived or released, except as expressly provided in the Credit
Agreement and the other Financing Documents. Notwithstanding the foregoing, each party hereto
acknowledges and agrees that non-compliance with any provision of the Existing Security Agreement,
if any, prior to the Effective Date is hereby waived.

[Remainder of Page Intentionally Left Blank]

1

IN WITNESS WHEREOF, the parties have caused this Agreement to be executed by their duly
authorized officers as of the date first above written.

PLEDGORS:

UNITED STATES ENRICHMENT CORPORATION

By: /s/ Ellen C. Wolf

Name: Ellen C. Wolf

Title: Senior Vice President and Chief Financial Officer

USEC INC.

By: /s/ Ellen C. Wolf

Name: Ellen C. Wolf

Title: Senior Vice President and Chief Financial Officer

NAC HOLDING INC.

By: /s/ Peter J. Walier

Name: Peter J. Walier

Title: President

NAC INTERNATIONAL INC.

By: /s/ Peter J. Walier

Name: Peter J. Walier

Title: President

AGENT:

JPMORGAN CHASE BANK, N.A. (formerly known

as JPMorgan Chase Bank), as

Administrative and Collateral Agent

By: /s/ James M. Barbato

Name: James M. Barbato

Title: Vice President

2SERIES A BOND GUARANTEE AGREEMENT - Exhibit 4.13

SERIES A BOND GUARANTEE AGREEMENT

dated as of June 14, 2005

between

UNITED STATES OF AMERICA

acting through the

Rural Utilities Service

as guarantor,

and

NATIONAL RURAL UTILITIES

COOPERATIVE FINANCE CORPORATION,

as the Borrower.

 

 

	
      TABLE OF CONTENTS

		
      Page
	
	RECITALS	..................................................................................................................................................	1
			
	
      ARTICLE I

	
      
	
      
	
      

	
      DEFINITIONS

	
      
	
      
	
      

	
      SECTION 1.1.
	
      Definitions...............................................................................................................................
	
      2

	 	 	 
	
      SECTION 1.2
	
      Principles of
      Construction.....................................................................................................
	
      6

	 	 	 
	
      ARTICLE II

	 	 	 
	
      THE GUARANTEE

	
      SECTION 2.1.
	
      Execution of
      Guarantee..........................................................................................................
	
      6

	 	 	 
	
      SECTION 2.2.
	
      Coverage of
      Guarantee...........................................................................................................
	
      6

	 	 	 
	
      SECTION 2.3.
	
      Payment on the
      Guarantee.....................................................................................................
	
      6

	 	 	 
	
      ARTICLE III

	 	 	 
	
      CONDITIONS PRECEDENT

	 	 	 
	
      SECTION 3.1.
	
      Conditions Precedent to Issuance of the
      Guarantee..............................................................
	
      7

	 	 	 
	
      SECTION 3.2.
	
      Conditions Precedent to each Advance..................................................................................
	
      8

	 	 	 
	
      ARTICLE IV

	 	 	 
	
      GUARANTEE FEE

	 	 	 
	
      SECTION 4.1.
	
      Guarantee
      Fee.........................................................................................................................
	
      9

	  	 	 
	
      SECTION 4.2.
	
      Amount of Guarantee Fee; Dates of Payment........................................................................
	
      9

	 	 	 
	
      i

	
      ARTICLE V

	 	 	 
	
      SERVICING OF THE GUARANTEED BOND

	 	 	 
	
      SECTION 5.1.
	
      Servicing....................................................................................................................................
	
      9

	 	 	 
	
      ARTICLE VI

	 	 	 
	
      REPORTING REQUIREMENTS

	 	 	 
	
      SECTION 6.1.
	
      Annual Reporting
      Requirements.............................................................................................
	
      10

	 	 	 
	
      SECTION 6.2.
	
      Rating Trigger Event
      Notices...................................................................................................
	
      10

	 	 	 
	
      SECTION 6.3.
	
      Default
      Notices.........................................................................................................................
	
      11

	 	 	 
	
      ARTICLE VII

	 	 	 
	
      LIMITATIONS ON AMENDMENTS TO THE GUARANTEED BOND

	 	 	 
	
      SECTION 7.1
	
      Limitations on Amendments to the Guaranteed
      Bond.............................................................
	
      11

	 	 	 
	
      ARTICLE VIII

	 	 	 
	
      REPRESENTATIONS OF THE PARTIES

	 	 	 
	
      SECTION 8.1.
	
      Representation of RUS.............................................................................................................
	
      11

	 	 	 
	
      SECTION 8.2.
	
      Representations of the
      Borrower...............................................................................................
	
      11

	 	 	 
	
      ARTICLE IX

	 	 	 
	
      AGREEMENTS OF THE BORROWER

	 	 	 
	
      SECTION 9.1.
	
      Patronage
      Refunds...................................................................................................................
	
      13

	 	 	 
	
      SECTION 9.2.
	
      Security and
      Collateral.............................................................................................................
	
      13

	 	 	 
	
      SECTION 9.3.
	
      Use of
      Savings..........................................................................................................................
	
      14

	 	 	 
	
      SECTION 9.4.
	
      Subrogation................................................................................................................................
	
      14

	 	 	 
	
      SECTION 9.5.
	
      Use of
      Proceeds........................................................................................................................
	
      14

			
		
      ii
	

	
      SECTION 9.6.
	
      Compliance with Covenants in Other
      Agreements.....................................................................
	
      14

	 	 	 
	
      SECTION 9.7.
	
      Ratings..........................................................................................................................................
	
      14

	 	 	 
	
      SECTION 9.8.
	
      Acknowledgement of
      Borrower...................................................................................................
	
      15

	 	 	 
	
      ARTICLE X

	 	 	 
	
      EVENTS OF DEFAULT

	 	 	 
	
      SECTION 10.1.
	
      Events of
      Default........................................................................................................................
	
      15

	 	 	 
	
      SECTION 10.2.
	
      Compulsory
      Redemption............................................................................................................
	
      15

	 	 	 
	
      SECTION 10.3.
	
      Acceleration by RUS's Purchase of the
      Bond...........................................................................
	
      15

	 	 	 
	
      SECTION 10.4.
	
      Effect of Payments by RUS pursuant to the RUS
      Guarantee.....................................................
	
      16

	 	 	 
	
      SECTION 10.5.
	
      Remedies Not
      Exclusive............................................................................................................
	
      16

	 	 	 
	
      ARTICLE XI

	 	 	 
	
      MISCELLANEOUS

	 	 	 
	
      SECTION 11.1.
	
      GOVERNING
      LAW..................................................................................................................
	
      16

	 	 	 
	
      SECTION 11.2.
	
      WAIVER OF JURY
      TRIAL.....................................................................................................
	
      16

	 	 	 
	
      SECTION 11.3.
	
      Method of
      Payment.................................................................................................................
	
      16

	 	 	 
	
      SECTION 11.4.
	
      Notices......................................................................................................................................
	
      16

	 	 	 
	
      SECTION 11.5.
	
      Benefit of
      Agreement...............................................................................................................
	
      17

	 	 	 
	
      SECTION 11.6
	
      Entire
      Agreement......................................................................................................................
	
      17

	 	 	 
	
      SECTION 11.7.
	
      Amendments and
      Waivers........................................................................................................
	
      17

	 	 	 
	
      SECTION 11.8.
	
      Counterparts...............................................................................................................................
	
      17

	 	 	 
	
      SECTION 11.9.
	
      Termination of
      Agreement........................................................................................................
	
      17

	 	 	 
	
      SECTION 11.10.
	
      Survival.......................................................................................................................................
	
      17

	 	 	 
	
      SECTION 11.11.
	
      Severability..................................................................................................................................
	
      18

	 	 	 
		
      iii
	

Schedule I - Addresses for Notices

Annex A - Form of Bond Purchase Agreement

Annex B - Form of Pledge Agreement

Annex C - Form of Reimbursement Note

Annex D - Opinion of Counsel to the Borrower

Annex E - Officers' Closing Certificate

Annex F - Officers' Advance Certificate

Annex G - Auditors' Letter
iv

                                                    

              SERIES A BOND GUARANTEE AGREEMENT dated of 

                                                   
June 14, 2005, between the UNITED STATES OF AMERICA 

                                                   
(the "Government"), acting through the Rural Utilities Service, a Rural

                                                   
Development agency of the United States Department of Agriculture, and its

                                                   
successors and assigns ("RUS");
and NATIONAL RURAL UTILITIES

                                                   
COOPERATIVE FINANCE CORPORATION, a cooperative association 

                                                   
existing
under the laws of the District of Columbia (the "Borrower").

RECITALS

              
1. On November 29, 2004, the Borrower applied to RUS (the "Application"),
in accordance with Section 313A of the Rural Electrification Act of 1936, as
amended (the "RE Act") and the regulations promulgated
thereunder (as set forth in Section 1720 of Part 7 of the Code of Federal
Regulations (the "Regulations")), for RUS to guarantee loans
from the Federal Financing Bank, a body corporate and instrumentality of the
Government under the general supervision of the Secretary of the Treasury, and
its permitted successors and assigns, ("FFB"), to the Borrower,
the proceeds of which would be used by the Borrower to fund new Eligible Loans
(as defined herein) or to refinance existing debt instruments of the Borrower
used to fund Eligible Loans.

              
2. RUS has determined that the Borrower is eligible for guarantees under
Section 313A of the RE Act.

              
3. FFB is willing to make a loan to the Borrower in the aggregate principal
amount of up to $1,000,000,000 upon the terms and subject to the conditions set
out in the Series A Bond Purchase Agreement between FFB and the Borrower dated
as of the date hereof (such agreement being in the form of Annex A attached
hereto, as the same may be amended, supplemented, consolidated or restated from
time to time in accordance with the terms thereof and hereof being hereinafter
called the "Bond Purchase Agreement"), and upon the terms and
subject to the conditions set out in the Series A Future Advance Bond issued by
the Borrower to FFB and dated as of the date hereof (such bond being in the form
attached to the Bond Purchase Agreement, as the same may be amended,
supplemented, consolidated or restated from time to time in accordance with the
terms thereof and hereof being hereinafter called the "Bond").

              
4. RUS is willing to issue its guarantee of the Bond, as contemplated by
Section 313A of the RE Act, upon the terms and subject to the conditions
hereinafter provided.

              
NOW, THEREFORE, in consideration of the mutual agreements herein contained, RUS
and the Borrower agree as follows:

1

Series A Bond Guarantee Agreement

ARTICLE I

DEFINITIONS

              
SECTION 1.1. Definitions. As used in this
Agreement, the following terms shall have the following meanings:

              
"91-day Treasury-Bill Rate" shall mean, for any date, the rate
equal to the weighted average per annum discount rate (expressed as a bond
equivalent yield and applied on a daily basis) for direct obligations of the
United States with a maturity of thirteen weeks ("91-day Treasury-Bills")
sold at the applicable 91-day Treasury-Bill auction on or most recently prior to
such date, as published on the website http://wwws.publicdebt.treas.gov/AI/OFBills
or otherwise as reported by the U.S. Department of the Treasury. In the event
that the results of the auctions of 91-day Treasury Bills cease to be published
or reported as provided above, or that no 91-day Treasury Bill auction is held
in a particular week, then the 91-day Treasury-Bill Rate in effect as a result
of the last such publication or report will remain in effect until such time, if
any, as the results of auctions of 91-day Treasury-Bills will again be so
published or reported or such auction is held, as the case may be.

              
"Administrator" shall mean the Administrator of RUS.

              
"Advance" shall have the meaning given to that term in the
Bond.

              
"Agreement" shall mean this Series A Bond Guarantee
Agreement, as the same may be amended, supplemented, consolidated or restated
from time to time.

              
"Application" shall have the meaning given to that term in
Recital 1.

              
"Bond" shall have the meaning given to that term in Recital 3.

              
"Bond Fee" shall mean the fee applicable to each Advance as
calculated in accordance with paragraph 9(b) of the Bond.

              
"Bond Purchase Agreement" shall have the meaning given to that
term in Recital 3.

              
"Bond Documents" shall mean the Bond, the Bond Purchase
Agreement, the Guarantee, this Agreement, the Pledge Agreement and the
Reimbursement Note.

              
"Borrower" shall have the meaning given to that term in the
Preamble.

              
"Borrower Notice" shall have the meaning given to that term in
the Pledge Agreement.

              
"Business Day" shall mean any day other than a Saturday, a
Sunday, a legal public holiday under 5 U.S.C. section 6103 for the purpose of
statutes relating to pay and leave of employees or any other day declared to be
a legal holiday for the purpose of

2

Series A Bond Guarantee Agreement

statutes relating to pay and leave of employees by Federal statute or Federal
Executive Order.

              
"Certificate of Available Securities" shall have the meaning
given to that term in the Pledge Agreement.

              
"Certificate of Pledged Collateral" shall have the meaning
given to that term in the Pledge Agreement.

              
"Closing Date" shall mean June 14, 2005.

              
"Concurrent Loan" shall mean a Loan that the Borrower has
extended or extends for the cost of an eligible electrification or telephone
purpose under the RE Act, concurrently with an insured loan made by the
Secretary, as provided in Section 307 of the RE Act.

              
"Consolidated Subsidiary" means at any date any Subsidiary and
any other entity the accounts of which would be combined or consolidated with
those of the Borrower in its combined or consolidated financial statements if
such statements were prepared as of such date.

              
"Eligible Loan" shall mean all or part of any Loan that the
Borrower has made for any electrification or telephone purpose eligible under
the RE Act, to the extent the Loan is not used directly or indirectly to fund
projects for the generation of electricity.

              
"Event of Default" shall have the meaning given to that term in
Section 10.1.

              
"FFB" shall have the meaning given to that term in Recital 1.

              
"Financial Statements", in respect of a Fiscal Year, shall mean
the consolidated financial statements (including footnotes) of the Borrower for
that Fiscal Year as audited by independent certified public accountants
appointed by the Borrower.

              
"Fiscal Year" shall mean the fiscal year of the Borrower, as
such may be changed from time to time, which at the date hereof commences on
June 1 of each calendar year and ends on May 31 of the following calendar year.

              
"Government" shall have the meaning given to that term in the
Preamble.

              
"Guarantee" shall mean the guarantee to be executed by the
Secretary, in the form attached to the Bond.

              
"Guarantee Fee" shall have the meaning given to that term in
Section 4.1.

              
"Guaranteed Bond" shall mean the Bond with the executed
Guarantee attached thereto.

              
"Indebtedness" with respect to any Person shall mean without
duplication:

3

Series A Bond Guarantee Agreement

              
(a) all indebtedness which would appear as indebtedness on a balance sheet of
such Person prepared in accordance with generally accepted accounting principles
(i) for money borrowed, (ii) which is evidenced by securities sold for money or
(iii) which constitutes purchase money indebtedness;

              
(b) all indebtedness of others guaranteed by such Person (not including
endorsements for collection or deposit in the ordinary course of business);

              
(c) all indebtedness secured by any mortgage, lien, pledge, charge or
encumbrance upon property owned by such Person, even though such Person has not
assumed or become liable for the payment of such indebtedness; and

              
(d) all indebtedness of such Person created or arising under any conditional
sale or other title retention agreement (including any lease in the nature of a
title retention agreement) with respect to property acquired by such Person
(even though the rights and remedies of the seller or lender under such
agreement in the event of default are limited to repossession of such property),
but only if such property is included as an asset on the balance sheet of such
Person,

              
provided that, in computing the "Indebtedness" of such Person,
there shall be excluded any particular indebtedness if, upon or prior to the
maturity thereof, there shall have been deposited with the proper depositary in
trust money (or evidences of such indebtedness) in the amount necessary to pay,
redeem or satisfy such indebtedness; and provided further that no
provision of this definition shall be construed to include as "Indebtedness" of the Borrower or its Consolidated Subsidiaries any
indebtedness by virtue of any agreement by the Borrower or its Consolidated
Subsidiaries to advance or supply funds to Members or Consolidated Subsidiary
members.

              
"Investment Grade Rating" shall mean, in respect of any ratable
instrument, a rating for that instrument in one of the four highest rating
categories (within which there may be subcategories or gradations which are to
be ignored for the purposes of this definition) of a Rating Agency. At the date
hereof, this would require the following: (i) a BBB- rating or higher from
Standard & Poor's, a division of The McGraw-Hill Companies, Inc.; (ii) a
Baa3 rating or higher from Moody's Investors Service, Inc.; or (iii) a BBB-
rating or higher from Fitch, Inc.

              
"Loan" shall mean a loan that the Borrower has or will have
outstanding to any of its Members or associates.

              
"Member" shall mean any Person who is member or patron of the
Borrower, as the case may be.

              
"Person" means an individual, a corporation, a partnership, an
association, a trust or any other entity or organization, including a government
or political subdivision or an agency or instrumentality thereof.

              
"Pledge Agreement" shall mean the pledge agreement to be
entered into by the Borrower, RUS and U.S. Bank Trust National Association, in
the form of Annex B

4

Series A Bond Guarantee Agreement

attached hereto, as the same may be amended, supplemented, consolidated or
restated from time to time in accordance with the terms thereof and hereof.

              
"Program" shall mean the guarantee program for bonds and notes
issued for electrification or telephone purposes authorized by Section 313A of
the RE Act.

              
"Rating Agency" shall mean (i) Standard & Poor's, a
division of The McGraw-Hill Companies, Inc., Moody's Investors Service, Inc.,
Fitch, Inc; and (ii) their respective successor rating agencies.

              
A "Rating Trigger Event" shall exist at any time when the
Borrower has any Senior Secured Debt (without regard to the Guarantee or any
other third party credit support) that does not have at least two of the
following ratings: (i) A- or higher from Standard & Poor's, a division of
The McGraw-Hill Companies, Inc.; (ii) A3 or higher from Moody's Investors
Service, Inc.; (iii) A- or higher from Fitch, Inc.; and (iv) an equivalent
rating from a successor rating agency to any of those Rating Agencies.

              
"RE Act" shall have the meaning given to that term in Recital
1.

              
"Regulations" shall have the meaning given to that term in
Recital 1.

              
"Reimbursement Note" shall mean the Series A Reimbursement Note
issued by the Borrower to RUS, in the form of Annex C attached hereto, as the
same may be amended, supplemented, consolidated or restated from time to time in
accordance with the terms thereof and hereof.

              
"Requested Advance Date" shall have the meaning given to that
term in the Bond.

              
"RUS" shall have the meaning given to that term in the
Preamble.

              
"Secretary" shall mean the Secretary of Agriculture acting
through the Administrator.

              
"Senior Secured Debt" of the Borrower means non-subordinated
secured bonds or notes of the Borrower having an aggregate principal amount of
at least $100,000,000 which, at the date hereof, means the Borrower's collateral
trust bonds, provided, however, that "Senior Secured
Debt" shall not include (i) up to $500,000,000 of debt designated by
the Borrower as not being "Senior Secured Debt"; and (ii) any
other debt of the Borrower that RUS agrees shall not be "Senior Secured
Debt".

              
"Subrogation Claim" shall have the meaning given to that term
in Section 9.4(a).

              
"Subsidiary" of any Person means (i) any corporation more than
50% of whose stock of any class or classes having by the terms thereof ordinary
voting power to elect a majority of the directors of such corporation
(irrespective of whether or not at the time stock of any class or classes of
such corporation shall have or might have voting power by reason of the
happening of any contingency) is at the time owned by such

5

Series A Bond Guarantee Agreement

Person directly or indirectly through its Subsidiaries; and (ii) any other
Person in which such Person directly or indirectly through Subsidiaries has more
than a 50% voting and equity interest; provided that no Person shall be
deemed a Subsidiary whose only assets are (A) loans guaranteed, in whole or in
part, as to principal and interest by the Government through RUS pursuant to a
guarantee; and (B) investments incidental thereto.

              
"Termination Date" shall mean the date upon which this
Agreement terminates in accordance with Section 11.9.

              
SECTION 1.2. Principles of Construction. Unless
the context shall otherwise indicate, the terms defined in Section 1.1
hereof include the plural as well as the singular and the singular as well as
the plural. The words "hereafter", "herein", "hereof", "hereto" and "hereunder", and words of
similar import, refer to this Agreement as a whole. The descriptive headings of
the various articles and sections of this Agreement were formulated and inserted
for convenience only and shall not be deemed to affect the meaning or
construction of the provisions hereof.

ARTICLE II

THE GUARANTEE

              
SECTION 2.1. Execution of Guarantee. Upon
presentation to RUS of the Bond, and upon satisfaction of the conditions set
forth in Section 3.1 of this Agreement, and subject to Section 2.2, the
Secretary shall execute, pursuant to the RE Act, the Guarantee.

              
SECTION 2.2. Coverage of Guarantee. The Guarantee
shall be an obligation supported by the full faith and credit of the Government
and incontestable except for fraud or misrepresentation of which FFB had actual
knowledge at the time it extended the loan represented by the Guaranteed Bond.

              
SECTION 2.3. Payment on the Guarantee. RUS
guarantees the full repayment of the principal, interest, late payment charges,
Bond Fees and discount or prepayment premiums, if any, when and as due on the
Guaranteed Bond in accordance with the terms of the Guarantee, provided, however,
that any payment by RUS under the Guarantee does not relieve the Borrower of any
of its obligations or liabilities under or in respect of this Agreement or any
of the Bond Documents.

6

Series A Bond Guarantee Agreement

ARTICLE III

CONDITIONS PRECEDENT

              
SECTION 3.1. Conditions Precedent to Issuance of the
Guarantee. RUS shall be under no obligation to execute and deliver the
Guarantee unless and until the following conditions have been satisfied or
waived in writing:

              
(a) Bond Documents. RUS shall have received originals of: (i) the
Bond (with an unexecuted Guarantee attached thereto) duly executed on behalf of
the Borrower, identical in all respects to the form of Bond attached to the Bond
Purchase Agreement except to the extent that RUS may have approved changes
therein, (ii) the Bond Purchase Agreement duly executed on behalf of the
Borrower and FFB, identical in all respects to the form of Bond Purchase
Agreement in Annex A attached hereto except to the extent that RUS may have
approved changes therein, (iii) the Pledge Agreement duly executed on behalf of
the Borrower and the Collateral Agent (as defined therein), identical in all
respects to the form of Pledge Agreement in Annex B attached hereto except to
the extent that RUS may have approved changes therein, and (iv) the
Reimbursement Note duly executed on behalf of the Borrower, identical in all
respects to the form of Reimbursement Note in Annex C attached hereto except to
the extent that RUS may have approved changes therein.

              
(b) Amount of Concurrent Loans. (i) The Borrower shall have
provided a certified list of Concurrent Loans and their outstanding principal
balances as of the last day of the month immediately preceding the Closing Date;
and (ii) on the Closing Date the maximum principal amount of the Guaranteed Bond
shall not exceed the total principal amount of Concurrent Loans outstanding on
the last day of the month immediately preceding the Closing Date as certified
pursuant to paragraph (i) of this subsection.

              
(c) Opinion of Counsel. Counsel to the Borrower shall have
furnished an opinion substantially as to each of the matters listed in Annex D
attached hereto.

              
(d) No material adverse change. The Borrower shall have certified
to the Secretary (in the manner specified in paragraph (g) of this Section 3.1),
and the Secretary shall be satisfied, that no material adverse change shall have
occurred in the financial condition of the Borrower between the date of the
Application and the date of execution of the Guarantee.

              
(e) Investment Grade Rating of Bond. The Borrower shall have
provided evidence of an Investment Grade Rating from a Rating Agency for the
Bond, without regard to the Guarantee.

              
(f) Rating of Senior Secured Debt. The Borrower shall have
provided evidence satisfactory to the Secretary of a credit rating on its Senior
Secured Debt, without regard to the Guarantee and without regard to any third
party credit support.

7

Series A Bond Guarantee Agreement

              
(g) Certification of Senior Management. The Borrower shall have
provided RUS a certification by its Governor and its Chief Financial Officer (or
other senior management acceptable to the Secretary), substantially in the form
attached of Annex E attached hereto, of the following: (i) that the Borrower is
a lending institution organized as a private, not-for-profit, cooperative
association with the appropriate expertise, experience and qualifications to
make loans for electrification or telephone purposes; (ii) the matter to be
certified under paragraph (d) of this Section 3.1; (iii) acknowledgment of the
Borrower's commitment to comply with the reporting requirements specified in
Article VI; and (iv) to the effect that no Rating Trigger Event exists.

              
(h) UCC Filing. The Borrower shall have provided RUS with evidence
that the Borrower has filed the financing statement required pursuant to Section
2.05(i) of the Pledge Agreement.

              
SECTION 3.2. Conditions Precedent to each Advance.
The following conditions shall be fulfilled to the satisfaction of RUS or waived
in writing by RUS prior to the drawdown of each Advance under the Guaranteed
Bond:

                   
(a) Existing Loans. The Borrower shall have certified to the
Secretary (in the manner specified in paragraph (d) of this Section 3.2): (i)
the total aggregate principal amount of outstanding Eligible Loans as at the
last day of the month immediately preceding the Requested Advance Date;
(ii) the total aggregate principal amount of outstanding Loans as at the
last day of the month immediately preceding the Requested Advance Date; and
(iii) the percentage the amount in subparagraph (i) comprises of the amount
in subparagraph (ii).

                   
(b) Use of Proceeds. The Borrower shall have certified to the
Secretary (in the manner specified in paragraph (d) of this Section 3.2) that
the Advance will be applied: (i) to fund new Eligible Loans under the RE Act;
and/or (ii) to refinance existing debt instruments of the Borrower, in the case
of each such debt instrument up to the percentage certified by the Borrower in
accordance with Section 3.2(a)(iii) hereof.

                   
(c) No material adverse change. The Borrower shall have certified
to the Secretary (in the manner specified in paragraph (d) of this Section 3.2),
and the Secretary shall be satisfied, that no material adverse change shall have
occurred in the financial condition of the Borrower between the Closing Date and
the applicable Requested Advance Date.

                   
(d) Certification of Senior Management. The Borrower shall have
provided RUS a certification by its Governor and its Chief Financial Officer (or
other senior management acceptable to the Secretary), substantially in the form
attached of Annex F attached hereto, of the matters to be certified under
paragraphs (a), (b) and (c) of this Section 3.2.

                  
(e) Certificate of Available Securities/Pledged Collateral. The
Borrower shall have provided RUS a copy of a Certificate of Available Securities
or 

8

Series A Bond Guarantee Agreement

Certificate of Pledged Collateral, as applicable, in accordance with the
terms of the Pledge Agreement.

ARTICLE IV

GUARANTEE FEE

              
SECTION 4.1. Guarantee Fee. The Borrower shall
pay a guarantee fee (the "Guarantee Fee"), to the RUS for
deposit into the Rural Economic Development Subaccount maintained under Section
313(b)(2)(A) of the RE Act.

              
SECTION 4.2. Amount of Guarantee Fee; Dates of
Payment. (a) The Guarantee Fee will be in the amount of 30 basis points
(0.30 percent) of the unpaid principal amount of the Bond, payable as provided
in paragraph (b) of this Section 4.2.

              
(b) The Guarantee Fee will be payable, in advance, on each January 15 and
July 15 in the amount of 15 basis points (0.15 percent) of the outstanding
principal amount of the Bond on that date. In addition, on the date of each
Advance under the Bond, the Borrower will pay to RUS the Guarantee Fee on the
principal amount of such advance in the amount of (i) 30 basis points (0.30
percent) of the principal amount of such advance multiplied by (ii) the ratio of
(x) the actual amount of days from the date of such advance until the next
January 15 or July 15, whichever comes first, to (y) 365 (except in calendar
years including February 29, when the number shall be 366).

              
(c) payments of the Guarantee Fee are non-refundable as of the date and
in the amount required to be paid hereunder, without regard to any reduction in
the principal amount of the Bond after that date.

ARTICLE V

SERVICING OF THE GUARANTEED BOND

              
SECTION 5.1. Servicing. The Secretary, or other
agent of the Secretary on his or her behalf, shall have the right to service the
Guaranteed Bond, and periodically inspect the books and accounts of the Borrower
to ascertain compliance with the provisions of the RE Act with respect to the
guarantees under Section 313A thereof and the Bond Documents. The Secretary, or
agent thereof, shall endeavor to give the Borrower at least five Business Days'
notice of any intention to inspect the Borrower's books and accounts. Such
inspection shall be made only during regular office hours of the Borrower or at
any time the Borrower and Secretary, or agent thereof, find mutually convenient.

9

Series A Bond Guarantee Agreement

ARTICLE VI

REPORTING REQUIREMENTS

              
SECTION 6.1. Annual Reporting Requirements. Until
the Termination Date, the Borrower shall provide the Secretary with the
following items within 90 days of the end of each Fiscal Year, in each case, in
form and substance satisfactory to the Secretary:

              
(a) the Financial Statements for such Fiscal Year;

              
(b) a Certificate of Available Securities or Certificate of Pledged
Collateral, as applicable, as of the end of such Fiscal Year;

              
(c) a letter substantially in the form of Annex G attached hereto,
by Deloitte & Touche LLP or by such other reputable, independent certified
public accountants proposed by the Borrower, who in the judgment of the
Secretary have the requisite skills, knowledge, reputation and experience to
provide such letter, such letter to be based upon Schedule A to the applicable
certificate delivered under paragraph (b) of this Section 6.1;

              
(d) a receipt from the Collateral Agent (as defined in the Pledge
Agreement), or such other evidence as is satisfactory to the Secretary, as to
the Available Securities or Pledged Collateral, as applicable, held by the
Collateral Agent at the end of such Fiscal Year, such Available Securities or
Pledged Collateral, as applicable, to agree with Schedule A to the applicable
certificate delivered under paragraph (b) of this Section 6.1;

              
(e) a projection of the Borrower's balance sheet, income statement and
statement of cash flows over the ensuing five years, pro forma assuming the full
principal amount of the Bond is advanced;

              
(f) the most recent credit assessment of the Borrower issued by a Rating
Agency;

              
(g) a credit rating, issued by a Rating Agency, of the Senior Secured
Debt, without regard to the Guarantee and without regard to third party credit
support; and

              
(h) such other information as is reasonably requested by the Secretary.

              
SECTION 6.2. Rating Trigger Event Notices. If the
Borrower becomes aware that a Rating Trigger Event has occurred, the Borrower
shall deliver a Borrower Notice of such event to RUS and to the Collateral Agent
(as defined in the Pledge Agreement) before 4:00 p.m. District of Columbia time
on the Business Day following the date the Borrower has become aware of such
event, specifying the existence of such event.

10

Series A Bond Guarantee Agreement

              
SECTION 6.3. Default Notices. If an action,
occurrence or event shall happen that is, or with notice and the passage of time
would become, an Event of Default, the Borrower shall deliver a Borrower Notice
of such action, occurrence or event to RUS before 4:00 p.m. District of
Columbia time on the Business Day following the date the Borrower becomes aware
of such action, occurrence or event, and, if such Event of Default should occur,
shall submit to RUS, as soon as possible thereafter, a report setting forth its
views as to the reasons for the Event of Default, the anticipated duration of
the Event of Default and what corrective actions the Borrower is taking to cure
such Event of Default.

ARTICLE VII

LIMITATIONS ON AMENDMENTS TO THE GUARANTEED BOND

              
SECTION 7.1. Limitations on Amendments to the
Guaranteed Bond. No amendment or supplement to, and no modification or
rescission of, the Guaranteed Bond shall be effective unless approved in writing
by RUS, nor shall any waiver of any rights of RUS under the Guaranteed Bond be
effective against RUS unless such waiver has been approved in writing by RUS. No
amendment or supplement to, and no modification of, any of the other Bond
Documents, which materially adversely affects RUS, shall be effective unless
approved in writing by RUS, nor shall any waiver of any rights of RUS under any
of the Bond Documents be effective against RUS unless such waiver has been
approved in writing by RUS.

ARTICLE VIII

REPRESENTATIONS OF THE PARTIES

              
SECTION 8.1. Representation of RUS. RUS
represents that the Guarantee endorsed on the original of the Guaranteed Bond
constitutes a legal, valid and binding obligation supported by the full faith
and credit of the Government, incontestable except for fraud or
misrepresentation of which FFB had actual knowledge at the time it extended the
loan represented by the Guaranteed Bond.

              
SECTION 8.2. Representations of the Borrower. The
Borrower hereby represents to RUS that on the date hereof, the Closing Date, and
each Requested Advance Date:

                
  (a) the Borrower has been duly organized and is validly existing and in
  good standing as a cooperative association under the laws of the District of
  Columbia;

              
(b) the Borrower has the corporate power and authority to execute and
deliver this Agreement and each of the other Bond Documents to which the 

11

Series A Bond Guarantee Agreement

Borrower is a party, to consummate the transactions contemplated hereby and
thereby and to perform its obligations hereunder and thereunder;

              
(c) the Borrower has taken all necessary corporate action to authorize
the execution and delivery of this Agreement and each of the other Bond
Documents to which the Borrower is a party, the consummation by the Borrower of
the transactions contemplated hereby and thereby and the performance by the
Borrower of its obligations hereunder and thereunder;

              
(d) this Agreement and each of the other Bond Documents to which the
Borrower is a party have been duly authorized, executed and delivered by the
Borrower and constitute the legal, valid and binding obligations of the
Borrower, enforceable against the Borrower in accordance with their respective
terms, subject to: (i) applicable bankruptcy, reorganization, insolvency,
moratorium and other laws of general applicability relating to or affecting
creditors' rights generally; and (ii) the application of general principles
of equity regardless of whether such enforceability is considered in a
proceeding in equity or at law;

              
(e) no approval, consent, authorization, order, waiver, exemption,
variance, registration, filing, notification, qualification, license, permit or
other action is now, or under existing law in the future will be, required to be
obtained, given, made or taken, as the case may be, with, from or by any
regulatory body, administrative agency or governmental authority having
jurisdiction over the Borrower to authorize the execution and delivery by the
Borrower of this Agreement or any of the other Bond Documents to which the
Borrower is a party, or the consummation by the Borrower of the transactions
contemplated hereby or thereby or the performance by the Borrower of its
obligations hereunder or thereunder;

              
(f) neither the execution or delivery by the Borrower of this Agreement
or any of the other Bond Documents to which the Borrower is a party nor the
consummation by the Borrower of any of the transactions contemplated hereby or
thereby nor the performance by the Borrower of its obligations hereunder or
thereunder, including, without limitation, the pledge of the Pledged Securities
(as such term is defined in the Pledge Agreement) to RUS if required, conflicts
with or will conflict with, violates or will violate, results in or will result
in a breach of, constitutes or will constitute a default under, or results in or
will result in the imposition of any lien or encumbrance pursuant to any term or
provision of the articles of incorporation or the bylaws of the Borrower or any
provision of any existing law or any rule or regulation currently applicable to
the Borrower or any judgment, order or decree of any court or any regulatory
body, administrative agency or governmental authority having jurisdiction over
the Borrower or the terms of any mortgage, indenture, contract or other
agreement to which the Borrower is a party or by which the Borrower or any of
its properties is bound;

              
(g) there is no action, suit, proceeding or investigation before or by
any court or any regulatory body, administrative agency or governmental
authority 

12

  

Series A Bond Guarantee Agreement

presently pending or, to the knowledge of the Borrower, threatened with
respect to the Borrower, this Agreement or any of the other Bond Documents to
which the Borrower is a party challenging the validity or enforceability of this
Agreement or any of the other Bond Documents to which the Borrower is a party or
seeking to restrain, enjoin or otherwise prevent the consummation by the
Borrower of the transactions contemplated by this Agreement or any of the other
Bond Documents to which the Borrower is a party or which, if adversely
determined, would have a material adverse effect on the Borrower's financial
condition or its ability to perform its obligations under this Agreement or any
of the other Bond Documents to which the Borrower is a party;

              
(h) the Borrower is a lending institution organized as a private,
not-for-profit, cooperative association with the appropriate expertise,
experience and qualifications to make loans for electrification or telephone
purposes;

              
(i) the total principal amount of the Guaranteed Bond plus the
outstanding amount of any other guaranteed bonds issued by the Borrower under
the Program does not exceed the total principal amount of Concurrent Loans
outstanding on the last day of the month immediately preceding the Closing Date;
and

              
(j) no material adverse change has occurred in the financial condition of
the Borrower between the date of the Application and the date this
representation is given.

ARTICLE IX

AGREEMENTS OF THE BORROWER

              
SECTION 9.1. Patronage Refunds. During any
portion of a Fiscal Year when a Rating Trigger Event exists, the Borrower shall
not make cash patronage refunds in excess of five percent of its total patronage
capital, as disclosed in its most recent Financial Statements. While the
Borrower is subject to such restriction, equity securities issued as part of a
patronage refund shall not be redeemed in cash, and, if the Borrower shall have
outstanding any common stock or preferred stock, the Borrower shall not issue
any dividends on any such stock.

              
SECTION 9.2. Security and Collateral. (a) If a
Rating Trigger Event exists, the Pledged Securities (as such term is defined in
the Pledge Agreement) shall be pledged in accordance with the terms and
conditions of the Pledge Agreement to secure the payment obligations of the
Borrower under this Agreement and under the Reimbursement Note.

              
(b) Until the Termination Date, the Borrower shall cause the Available
Securities or Pledged Collateral (as such terms are defined in the Pledge
Agreement), as the case may be, to be at all times not less than 100% of the
aggregate principal amount of the Guaranteed Bond and any other guaranteed bonds
issued by the Borrower under 

13

Series A Bond Guarantee Agreement

the Program and, except as provided for in paragraph (a) of this Section
9.2 or otherwise permitted by the Pledge Agreement, shall not create, or permit
to exist, any pledge, lien, charge, mortgage, encumbrance, debenture,
hypothecation or other similar security instrument that secures, or in any way
attaches to, such Available Securities or Pledged Collateral, as the case may
be, without the prior written consent of RUS.

              
SECTION 9.3. Use of Savings. The Borrower will
not use any amounts obtained from the reduction in funding costs provided by the
Program to reduce the interest rates the Borrower's Members or associates are
paying on new or outstanding Loans, other than new Concurrent Loans as provided
for in Part 1710 of the Regulations.

              
SECTION 9.4. Subrogation. (a) The Borrower agrees
that RUS shall be subrogated to the rights of FFB to the extent of any and all
payments made by RUS under the Guarantee (herein called the "Subrogation
Claim"). The Borrower agrees to pay directly to RUS all amounts due on
the Guaranteed Bond as to which RUS is so subrogated, together with interest
thereon (to the extent permitted by applicable law) at a rate determined by the
following paragraph, and such payments shall satisfy the obligations of the
Borrower hereunder with respect to such amounts paid by RUS.

              
(b) The Subrogation Claim of RUS shall bear interest from the date of
payment by RUS under the Guarantee until the date such claim is satisfied.
Interest shall accrue at an annual rate of the greater of 1.5 times the 91-day
Treasury-Bill Rate or 200 basis points (2.00%) above the interest rate on the
Guaranteed Bond.

              
SECTION 9.5. Use of Proceeds. (a) The Borrower
shall only apply the proceeds of the Guaranteed Bond to finance new Eligible
Loans or, subject to paragraph (b), to refinance existing debt instruments
of the Borrower.

              
(b) The Borrower may only apply the proceeds of each Advance to refinance
any of the Borrower's indebtedness up to the percentage certified by the
Borrower under Section 3.2(a)(iii) hereof of the amount of such
indebtedness being refinanced.

              
SECTION 9.6. Compliance with Covenants in Other
Agreements. The Borrower and each of its Subsidiaries will observe and
perform within any applicable grace period all covenants and agreements (as the
same may be from time to time amended or waived) contained in any agreement or
instrument relating to any Indebtedness of the Borrower or any of its
Subsidiaries, aggregating for the Borrower and its Subsidiaries in excess of
$50,000,000, if the effect of the failure to observe or perform such covenant or
agreement is to accelerate, or to permit the holder of such Indebtedness or any
other Person to accelerate, the maturity of such Indebtedness.

              
SECTION 9.7. Ratings. For the term of the Bond,
the Borrower shall request, and do all things reasonably within its power to
obtain (including paying all fees incidental thereto), credit ratings on its
Senior Secured Debt from at least two Rating Agencies on at least an annual
basis.

14

Series A Bond Guarantee Agreement

              
SECTION 9.8. Acknowledgement of Borrower. The
Borrower acknowledges and agrees that failure by the Borrower to receive any
repayment under a Loan, does not affect the Borrower's obligations to make
payments under this Agreement or any other Bond Document.

ARTICLE X

EVENTS OF DEFAULT

              
SECTION 10.1. Events of Default. Each of the
following actions, occurrences or events shall, but only (except in the case of
subsections (a), (c) and (e) below) if the Borrower does not cure such
action, occurrence or event within 30 days of notice from RUS requesting
that it be cured, constitute an "Event of Default" under the
terms of this Agreement:

                
  (a) A failure by the Borrower to make a payment of principal, interest
  or a Bond Fee when due on the Guaranteed Bond;

              
(b) The issuance of the Guaranteed Bond in violation of the terms and
conditions of this Agreement or any of the other Bond Documents;

              
(c) A failure by the Borrower to make payment of the Guarantee Fee
required by Article IV when due;

              
(d) A misrepresentation by the Borrower to the Secretary in any material
respect in connection with this Agreement, the Guaranteed Bond or the
information reported pursuant to Article VI;

              
(e) A failure by the Borrower to comply with the covenant contained in
Section 9.6 hereof; or

              
(f) A failure by the Borrower to comply with any other material covenant
or provision contained in this Agreement or any of the other Bond Documents.

              
SECTION 10.2. Compulsory Redemption. If an Event
of Default occurs, the Secretary may demand that the Borrower redeem the
Guaranteed Bond in accordance with its terms.

              
SECTION 10.3. Acceleration by RUS's Purchase of the
Bond. If an Event of Default occurs, and RUS purchases from FFB the Bond in
its entirety in the manner provided in Section 13.5 of the Bond Purchase
Agreement, then the entire purchase price shall be included in the Principal
Amount of the Reimbursement Note as defined therein and shall be immediately due
and payable to RUS. Payment to RUS of all amounts due under the Reimbursement
Note after such an acceleration shall satisfy in full all obligations of the
Borrower under the Bond and Reimbursement Note and all 

15

Series A Bond Guarantee Agreement

corresponding obligations under the other Bond
Documents, including any obligations to reimburse RUS for any payments
thereafter made by RUS under the RUS Guarantee.

              
SECTION 10.4. Effect of Payments by RUS pursuant to
the RUS Guarantee. No payment by RUS pursuant to the RUS Guarantee shall (i)
be considered a payment for purposes of determining the existence of a failure
of the Borrower to perform its obligations to RUS under the Bond Documents, or
(ii) relieve the Borrower of its obligations to reimburse RUS for payments made
by RUS pursuant to the RUS Guarantee. Payment by the Borrower to RUS of amounts
due under the Reimbursement Note shall satisfy pro tonto the
corresponding obligations of the Borrower under the Bond.

              
SECTION 10.5. Remedies Not Exclusive. Upon the
occurrence of an Event of Default, the Secretary shall be entitled to take such
other action as is provided for by law, in this Agreement, or in any of the
other Bond Documents, including injunctive or other equitable relief.

ARTICLE XI

MISCELLANEOUS

              
SECTION 11.1. GOVERNING LAW. THIS AGREEMENT SHALL
BE GOVERNED BY, AND CONSTRUED AND ENFORCED IN ACCORDANCE WITH, THE LAWS OF THE
UNITED STATES OF AMERICA, TO THE EXTENT APPLICABLE, AND OTHERWISE THE LAWS OF
THE DISTRICT OF COLUMBIA.

              
SECTION 11.2. WAIVER OF JURY TRIAL. EACH PARTY
HERETO HEREBY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY
RIGHT IT MAY HAVE TO A TRIAL BY JURY IN ANY LEGAL PROCEEDING DIRECTLY OR
INDIRECTLY ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS
CONTEMPLATED HEREBY (WHETHER BASED ON CONTRACT, TORT OR ANY OTHER THEORY). EACH
PARTY HERETO (A) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY
OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD
NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER AND (B)
ACKNOWLEDGES THAT IT AND THE OTHER PARTY HERETO HAVE BEEN INDUCED TO ENTER INTO
THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN
THIS SECTION 11.2.

              
SECTION 11.3. Method of Payment. All payments to
be made by the Borrower to RUS hereunder, shall be made in the manner notified
to the Borrower by RUS from time to time in accordance with Section 11.4.

              
SECTION 11.4. Notices. All notices and other
communications hereunder to be made to any party shall be in writing and shall
be addressed as specified in Schedule I attached hereto as appropriate. The
address, telephone number, or facsimile 

16

Series A Bond Guarantee Agreement

number for any party may be changed at any time and
from time to time upon written notice given by such changing party to the other
parties hereto. A properly addressed notice or other communication to the
Borrower shall be deemed to have been delivered at the time it is sent by
facsimile (fax) transmission. A properly addressed notice or other communication
to RUS shall be deemed to have been delivered at the time it is sent by
facsimile (fax) transmission, provided that the original of such faxed notice or
other communication shall have been received by RUS within five Business Days.

              
SECTION 11.5. Benefit of Agreement. This
Agreement shall become effective when it shall have been executed by RUS and the
Borrower, and thereafter shall be binding upon and inure to the respective
benefit of the parties and their permitted successors and assigns.

              
SECTION 11.6. Entire Agreement. This Agreement,
including Schedule I hereto and Annexes A to G hereto, and the other
Bond Documents, constitutes the entire agreement between the parties hereto
concerning the matters contained herein and supersedes all prior oral and
written agreements and understandings between the parties.

              
SECTION 11.7. Amendments and Waivers. (a) No
failure or delay of RUS or the Borrower in exercising any power or right
hereunder shall operate as a waiver thereof, nor shall any single or partial
exercise of any such right or power, or any abandonment or discontinuance of
steps to enforce such a right or power, preclude any other or further exercise
thereof or the exercise of any other right or power. No waiver of any provision
of this Agreement or consent to any departure by the Borrower therefrom shall in
any event be effective unless the same shall be authorized as provided in
paragraph (b) of this Section 11.7, and then such waiver or consent
shall be effective only in the specific instance and for the purpose for which
given. No notice or demand on the Borrower in any case shall entitle the
Borrower to any other or further notice or demand in similar or other
circumstances.

              
(b) No provision of this Agreement may be amended or modified except
pursuant to an agreement in writing entered into by RUS and the Borrower. No
provision of this Agreement may be waived except in writing by the party or
parties receiving the benefit of and under such provision.

              
SECTION 11.8. Counterparts. This Agreement may be
executed in two or more counterparts, each of which shall be an original, but
all of which together shall constitute one and the same instrument.

              
SECTION 11.9. Termination of Agreement. This
Agreement shall terminate upon the indefeasible payment in full of all amounts
payable hereunder, under the Reimbursement Note and under the Guaranteed Bond.

              
SECTION 11.10. Survival. The representations and
warranties of each of the parties hereto contained in this Agreement and
contained in each of the other Bond Documents to which such party hereto is a
party thereto, and the parties' obligations under any and all thereof, shall
survive and shall continue in effect following the execution and 

17

Series A Bond Guarantee Agreement

delivery of this Agreement, any disposition of the
Guaranteed Bond and the expiration or other termination of any of the other Bond
Documents, but, in the case of each Bond Document, shall not survive the
expiration or the earlier termination of such Bond Document, except to the
extent expressly set forth in such Bond Document.

              
SECTION 11.11. Severability. If any term or
provision of this Agreement or any Bond Document or the application thereof to
any circumstance shall, in any jurisdiction and to any extent, be invalid or
unenforceable, such term or such provision shall be ineffective as to such
jurisdiction to the extent of such invalidity or unenforceability without
invalidating or rendering unenforceable any remaining terms or provisions of
such Bond Document or the application of such term or provision to circumstances
other than those as to which it is held invalid or unenforceable.

18

              
IN WITNESS WHEREOF, each party hereto has caused this Agreement to be executed
by an authorized officer as of the day and year first above written.

 

	
      UNITED STATES OF AMERICA,

      acting through the Acting Administrator of the Rural Utilities Service
      

	
      By: 
	/s/  Curtis M. Anderson            
       
	
            
            Title:
      
	
      Acting Administrator of the Rural Utilities Service
      

 

 

	
      NATIONAL RURAL UTILITIES COOPERATIVE FINANCE CORPORATION, as the
      Borrower
      
 

	
      By:
	 _______________________________
	
      Title:
	   

 

[Signature Page to Series A Bond Guarantee Agreement]

              
IN WITNESS WHEREOF, each party hereto has caused this Agreement to be executed
by an authorized officer as of the day and year first above written.

 

	
      UNITED STATES OF AMERICA,

      acting through the Acting Administrator of the Rural Utilities Service
      

	
      By: 
	 _____________________________
	
            
            Title:
      
	
      Acting Administrator of the Rural Utilities Service
      

 

 

	
      NATIONAL RURAL UTILITIES COOPERATIVE FINANCE CORPORATION, as the
      Borrower

       

	
      By:
	 /s/  Sheldon C.
      Peterson                       
	
      Title:
	 CEO

 

[Signature Page to Series A Bond Guarantee Agreement]

SCHEDULE I

TO

SERIES A BOND GUARANTEE AGREEMENT

Addresses for Notices

    1. The addresses referred to in Section 11.4 hereof, for purposes of
    delivering communications and notices, are as follows:

  
    
        If to RUS:

        
            Rural Utilities Service

            United States Department of Agriculture

            1400 Independence Avenue, SW

            Washington, DC 20250

            Fax: 202-720-1725

            Attention of: The Administrator

            Subject: REDLG Program

        

        If to the Borrower:

      
            National Rural Utilities Cooperative Finance Corporation

            2201 Cooperative Way

            Herndon, VA 20171-3025

            Telephone: 703-709-6718

            Fax: 703-709-6819

            Attention of: Steven L. Lilly, Chief Financial Officer

            With a copy to:

            National Rural Utilities Cooperative Finance Corporation

            2201 Cooperative Way

            Herndon, VA 20171-3025

            Telephone: 703-709-6712

            Fax: 703-709-6811

            Attention of: John J. List, Esq., General Counsel

      

    

  

1

    

Annex A

Form of Bond Purchase Agreement

 

A-1

Annex B

Form of Pledge Agreement

 

B-1

Annex C

Form of Reimbursement Note

 

C-1

Annex D

Opinion of Counsel to the Borrower

              
(1) The Borrower has been duly incorporated and is validly existing as a
not-for-profit corporation in good standing under the laws of the District of
Columbia with corporate power and authority to execute and perform its
obligations under the Bond Documents.

              
(2) The Bond Documents have been duly authorized, executed and
delivered by the Borrower, and such documents constitute the legal, valid and
binding agreements of the Borrower, enforceable against the Borrower in
accordance with their respective terms subject to (a) applicable bankruptcy,
reorganization, insolvency, moratorium and other laws of general applicability
relating to or affecting creditors' rights generally, and (b) the application of
general principles of equity regardless of whether such enforceability is
considered in a proceeding in equity or at law.

              
(3) Neither the execution nor the delivery by the Borrower of any of the Bond
Documents nor the consummation by the Borrower of any of the transactions
contemplated therein, including, without limitation, the pledge of the Pledged
Securities (as such term is defined in the Pledge Agreement) to RUS if required,
nor the fulfillment by the Borrower of the terms of any of the Bond Documents
will conflict with or violate, result in a breach of or constitute a default
under any term or provision of the Articles of Incorporation or By-laws of the
Borrower or any law or any regulation or any order known to Counsel currently
applicable to the Borrower of any court, regulatory body, administrative agency
or governmental body having jurisdiction over the Borrower or the terms of any
indenture, deed of trust, note, note agreement or instrument to which the
Borrower is a party or by which the Borrower or any of its properties is bound.

              
(4) No approval, authorization, consent, order, registration, filing,
qualification, license or permit of or with any state or Federal court or
governmental agency or body including, without limitation, RUS, having
jurisdiction over the Borrower is required for any consummation by the Borrower
of the transactions contemplated by the Bond Documents except such as have been
obtained from RUS; provided, however, no opinion is expressed as to the
applicability of any Federal or state securities law to any sale, transfer or
other disposition of the Guaranteed Bond after the date hereof.

              
(5) There is no pending or, to the best of Counsel's knowledge, threatened
action, suit or proceeding before any court or governmental agency, authority or
body or any arbitrator with respect to the Borrower, or any of the Bond
Documents, or which, if adversely determined, would have a material adverse
effect on the Borrower's financial condition or its ability to perform its
obligations under any of the Bond Documents.

 

D-1

Annex E

Officers' Closing Certificate

TO:         The United States of America acting through the Rural Utilities Service.

              
We,
[                           ],
Governor, and
[                           ],
Chief Financial Officer, of National Rural Utilities Cooperative Finance
Corporation (the "Borrower"), pursuant to the Series A
Bond Guarantee Agreement dated as of June 14, 2005, between the Borrower
and the United States of America acting through Rural Utilities Service (the "Bond Guarantee Agreement"), hereby certify on behalf of the
Borrower that as at the date hereof:

              
(1) the Borrower is a lending institution organized as a private,
not-for-profit, cooperative association with the appropriate expertise,
experience and qualifications to make loans for electrification or telephone
purposes;

              
(2) no material adverse change has occurred in the financial condition of the
Borrower between the date of the Application and the date hereof;

              
(3) we acknowledge the commitment of the Borrower to submit to the Secretary
the documents required under Article VI of the Bond Guarantee Agreement in
accordance with the terms thereof;

              
(4) all of the representations contained in Section 8.2 of the Bond Guarantee
Agreement remain true and correct in all respects; and

              
(5) no Rating Trigger Event exists.

Capitalized terms used in this certificate shall have the meanings given to
those terms in the Bond Guarantee Agreement.

DATED as of this 14th day of June, 2005.

	
      NATIONAL RURAL UTILITIES COOPERATIVE FINANCE CORPORATION

	     
	_____________________________

      Governor
	
            
             
      
            
            
_____________________________

            Chief Financial Officer
      

E-1

Annex F

Officers' Advance Certificate

TO:         The United States of America acting through the Rural Utilities Service.

              
We,
[                           ],
Governor, and
[                           ],
Chief Financial Officer, of National Rural Utilities Cooperative Finance
Corporation (the "Borrower"), pursuant to the Series A
Bond Guarantee Agreement dated as of June 14, 2005, between the Borrower
and the United States of America acting through Rural Utilities Service (the "Bond Guarantee Agreement"), hereby certify on behalf of the
Borrower that:

    
    
(1) (i) as at the last day of the month immediately preceding the date
hereof, the total aggregate principal amount of outstanding Eligible Loans is:
$                        ;

    

                  
    (ii) as at the last day of the month immediately preceding the date
    hereof, the total 

                  
    aggregate principal amount of outstanding Loans is:
    $                        ;

                  
    (iii) the percentage the amount under (i) comprises of the amount under
    (ii)
    is:               %;

    
    
    (2) the Advance will be applied to: (i) fund new Eligible Loans under the
    RE Act; or (ii) to refinance existing debt instruments of the Borrower, in
    the case of each such debt instrument up to the percentage set forth in
    clause (1)(iii) above;

(3) as at the date hereof, no material adverse change has occurred in the
financial condition of the Borrower between the between the Closing Date and the
applicable Requested Advance Date; and

(4) as at the date hereof, all of the representations contained in Section
8.2 of the Bond Guarantee Agreement remain true and correct in all respects.

    

F-1

    

    

    
Capitalized terms used in this certificate shall have the meanings given to
those terms in the Bond Guarantee Agreement.

DATED as of this         day of
                     ,
20     .

	
      NATIONAL RURAL UTILITIES COOPERATIVE FINANCE CORPORATION
 

	_____________________________

      Governor

      

      _____________________________

      Chief Financial Officer

F-2

Annex G

Auditors' Letter

To the Board of Directors of

National Rural Utilities Cooperative Finance Corporation

Herndon, Virginia

We have performed the procedures enumerated below, which were agreed to by
National Rural Utilities Cooperative Finance Corporation (the "Company") and the Rural Utilities Service (the
"RUS"),
solely to assist in evaluating the Company's compliance with Section 6.1(b) of
the Series A Bond Guarantee Agreement between the Company and the United States
of America, acting through the RUS, dated June 14, 2005 (the "Bond
Guarantee Agreement"), as of [last day of preceding fiscal year]. The
Company's management is responsible for the Company's compliance with those
requirements. This agreed-upon procedures engagement was conducted in accordance
with attestation standards established by the American Institute of Certified
Public Accountants. The sufficiency of these procedures is solely the
responsibility of those parties specified in this report. Consequently, we make
no representation regarding the sufficiency of the procedures described below
either for the purpose for which this report has been requested or for any other
purpose.

The procedures that we performed and our findings are as follows:

1.      We obtained the attached schedule of the total aggregate unpaid principal
amount of the securities identified by the Company as comprising [the Available
Securities][the Pledged Securities], as defined in the Bond Guarantee Agreement,
as of [last day of preceding fiscal year] from Company management and compared
the total aggregate unpaid principal amount shown on such schedule ($ ____) to
the Company's underlying accounting records as of the same date and found them
to be in agreement.

2.      We obtained the attached schedule of the total aggregate amount of all
amounts outstanding under the Guaranteed Bond, as defined in the Bond Guarantee
Agreement, as of [last day of preceding fiscal year] from Company management and
compared the amount shown on such schedule ($_____) to the Company's underlying
accounting records as of the same date and found them to be in agreement.

We were not engaged to, and did not, conduct an examination, the objective of
which would be the expression of an opinion on compliance. Accordingly, we do
not express such an opinion. Had we performed additional procedures, other
matters might have come to our attention that would have been reported to you.

This report is intended solely for the information and use of the Company and
the RUS and is not intended to be and should not be used by anyone other than
these specified parties.

G-1

July   , 20

Yours truly,

_____________________________

DELOITTE & TOUCHE LLP

G-2

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