Document:

EX-10.1

EXHIBIT 10.1

SECOND AMENDMENT TO AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

This SECOND AMENDMENT TO AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT dated as of October
16, 2006 (this “Amendment”), among USEC INC., a Delaware corporation (“Holdings”),
UNITED STATES ENRICHMENT CORPORATION, a Delaware corporation (“Enrichment” and, together
with Holdings, the “Borrowers”), the LENDERS UNDER THE CREDIT AGREEMENT REFERRED TO BELOW
WHICH ARE PARTY HERETO, JPMORGAN CHASE BANK, N.A., as Administrative and Collateral Agent (the
“Administrative Agent”), and THE OTHER FINANCIAL INSTITUTIONS WHICH ARE NAMED IN THE CREDIT
AGREEMENT AS “AGENTS” THEREUNDER WHICH ARE PARTY HERETO, amends the Amended and Restated Revolving
Credit Agreement dated as of August 18, 2005, as previously amended by that certain First Amendment
to Amended and Restated Revolving Credit Agreement dated as of March 6, 2006 (as amended, the
“Credit Agreement”), among the Borrowers, the Lenders party thereto, the Administrative
Agent and the other financial institutions named therein as “agents” thereunder.

WHEREAS, the Borrowers have requested that the terms “Availability”, “Borrowing Base Reserves
(Inventory)” and “Collateral Availability” as defined in Section 1.01 of the Credit Agreement be
amended to provide for the Senior Note Reserve (as defined in the Credit Agreement) to be included
within the term Borrowing Base Reserves (Inventory) rather than separately deducted from the
calculation of Availability and Collateral Availability; and

WHEREAS, the Administrative Agent and the Lenders are willing to amend Section 1.01 of the
Credit Agreement to revise the terms “Availability”, “Borrowing Base Reserves (Inventory)” and
“Collateral Availability” as provided herein, subject to the terms and conditions set forth herein;

NOW, THEREFORE, in consideration of the foregoing and the agreements contained herein, the
parties hereby agree as follows:

1. Capitalized Terms.

Capitalized terms used herein which are defined in the Credit Agreement have the same meanings
herein as therein, except to the extent that such meanings are amended hereby.

2. Amendments to Section 1.01 of the Credit Agreement.

Subject to the satisfaction of the terms and conditions set forth in Section 4 hereof and in
reliance on the representations set forth in Section 3 hereof, the Borrowers, the Lenders and the
Administrative Agent agree that Section 1.01 of the Credit Agreement be and it hereby is amended,
by deleting the terms “Availability”, “Borrowing Base Reserves (Inventory)” and “Collateral
Availability” and replacing them with the following new terms:

“‘Availability’ means, at any time, the difference between (a) the
lesser at such time of (i) the aggregate Commitments of all Lenders and (ii) the
Borrowing Base, and (b) the sum at such time of (i) the unpaid principal balance of
the Loans and all accrued interest, fees and expenses plus (ii) the LC
Exposure.”

“‘Borrowing Base Reserves (Inventory)’ means, as of any date of
determination, such reserves in amounts as the Administrative Agent may from time to
time establish and revise (upward or downward) in its Permitted Discretion upon
reasonable prior notice to the Credit Parties to reflect, among other things: (a)
potential material adverse landlord claims resulting from the absence of landlord
waivers, environmental costs, rent, the cost of tails disposition not otherwise
covered by surety bonds or Letters of Credit and estimated DOE Lease Turnover
Obligations, (b) potential shortfalls in inventory of (i) natural uranium meeting
applicable ASTM specifications needed to meet the Credit Parties’ obligations to
Customers and/or (ii) enriched uranium meeting applicable ASTM specifications needed
to meet the Credit Parties’ obligations to Customers, (c) potential mark-to-market
costs, (d) inventory subject to other liens, (e) variances between estimated and
physical amounts of inventory, and (f) the Senior Note Reserve; provided
that, upon the Administrative Agent’s receipt of a letter agreement or other writing
from the DOE in form and substance satisfactory to the Administrative Agent in its
Permitted Discretion granting the Administrative Agent rights to access and dispose
of collateral on the premises leased from the DOE by the Borrowers, the
Administrative Agent shall no longer require a reserve for estimated DOE Lease
Turnover Obligations.”

“‘Collateral Availability’ means at any time the remainder of (a) the
Borrowing Base minus (b) the sum of (i) the unpaid principal balance of the
Loans and all accrued interest, fees and expenses plus (ii) the LC
Exposure.”

3. No Default; Representations and Warranties, etc.

Each of the Borrowers represents and warrants to the Lenders and the Administrative Agent that
as of the date hereof (a) the representations and warranties of the Credit Parties contained in
Article III of the Credit Agreement are true and correct in all material respects as of the date
hereof as if made on such date (except to extent that such representations and warranties expressly
relate to an earlier date, in which case they shall be true and correct in all material respects as
of such date); (b) the Borrowers are in compliance in all material respects with all of the terms
and provisions set forth in the Credit Agreement and the other Financing Documents to be observed
or performed by them thereunder; (c) no Default or Event of Default shall have occurred and be
continuing; and (d) the execution, delivery and performance by the Borrowers of this Amendment (i)
have been duly authorized by all necessary corporate and, if required, shareholder action on the
part of the Borrowers, (ii) will not violate any applicable law or regulation or the organizational
documents of any Borrower, (iii) will not violate or result in a default under any material
indenture, agreement or other instrument binding on any Borrower or any of its assets and (iv) do
not require any consent, waiver or approval of or by any Person (other than the Administrative
Agent and the Lenders) which has not been obtained.

4. Conditions Precedent. The Amendment shall become effective on the date of
this Amendment (the “Second Amendment Effective Date”); provided that, on or before the
Second Amendment Effective Date, the Administrative Agent shall have determined that each of the
following conditions precedent shall have been satisfied:

(a) Counterparts of Amendment. The Agent shall have received either (i) a counterpart
of this Amendment signed on behalf of the Borrowers and the Required Lenders and counterparts of
the Ratification of Guarantees attached hereto signed on behalf of NAC Holdings Inc. and NAC
International Inc., as guarantors, or (ii) written evidence reasonably satisfactory to the Agent
(which may include telecopy transmission of a signed signature page of this Amendment or such
Ratification of Guarantees, as applicable) that such parties have signed a counterpart of this
Amendment and such Ratification of Guarantees, as applicable.

(b) Consent Fee. As consideration for the amendments to the Credit Agreement set
forth herein, the Borrowers shall have paid to the Administrative Agent for the account of each
Lender that executes and delivers to the Administrative Agent a duly executed counterpart to this
Amendment prior to the Second Amendment Effective Date, a consent fee equal in amount to ten one
hundredths of one percent (10 basis points) of the amount of such Lender’s Commitment as in effect
immediately prior to the Second Amendment Effective Date.

5. Miscellaneous.

(a) The Borrowers, the Lenders and the Administrative Agent hereby ratify and
confirm the terms and provisions of the Credit Agreement and the other Financing Documents and
agree that, except to the extent specifically amended hereby, the Credit Agreement, the other
Financing Documents and all related documents shall remain in full force and effect. Nothing
contained herein shall constitute a waiver of any provision of the Financing Documents.

(b) The Borrowers agree to pay all reasonable expenses, including legal fees and
disbursements, incurred by the Administrative Agent in connection with this Amendment and the
transactions contemplated thereby.

(c) This Amendment may be executed in any number of counterparts (including by way
of facsimile transmission), each of which, when executed and delivered, shall be an original, but
all counterparts shall together constitute one instrument.

(d) This Amendment shall be governed by the laws of the State of New York and shall
be binding upon and inure to the benefit of the parties hereto and their respective successors and
assigns.

[Signature Pages Follow]

1

IN WITNESS WHEREOF, the parties hereto have caused this
Amendment to be duly executed by their respective authorized officers as of the day and year first
above written.

BORROWERS:

USEC INC.

By: /s/ John C. Barpoulis

Name: John C. Barpoulis

Title: Sr. Vice President, Chief Financial Officer and Treasurer

UNITED STATES ENRICHMENT CORPORATION

By: /s/ John C. Barpoulis

Name: John C. Barpoulis

Title: Sr. Vice President, Chief Financial Officer and Treasurer

ADMINISTRATIVE AGENT:

JPMORGAN CHASE BANK, N.A., as Administrative and Collateral Agent

By: /s/ James M. Barbato

Name: James M. Barbato

Title: Vice President

LENDERS:

JPMORGAN CHASE BANK, N.A.

By: /s/ James M. Barbato

Name: James M. Barbato

Title: Vice President

MERRILL LYNCH CAPITAL, a division of MERRILL LYNCH BUSINESS FINANCIAL SERVICES INC., as

Co-Syndication Agent and a Lender

By: /s/ Mary Beth O’Keefe

Name: Mary Beth O’Keefe

Title: Assistant Vice President

GMAC COMMERCIAL FINANCE LLC, as Co-Documentation Agent and a Lender

By: /s/ Thomas Maiale

Name: Thomas Maiale

Title: Director

WACHOVIA BANK, NATIONAL ASSOCIATION, as Co-Documentation Agent and a Lender

By: /s/ Jason Searle

Name: Jason Searle

Title: Vice President

SIEMENS FINANCIAL SERVICES, INC.

By: /s/ Mark Picillo

Name: Mark Picillo

Title: Vice President

SOVEREIGN BANK

By: /s/ Charles H. O’Donnell

Name: Charles H. O’Donnell

Title: Vice President

N.M. ROTHSCHILD & SONS LIMITED

By: /s/ N. A. Wood / Derek McCrone

Name: Nicholas Wood / Derek McCrone

Title: Director / Assistant Director

WELLS FARGO FOOTHILL, LLC

By: /s/ Mark Bradford

Name: Mark Bradford

Title: Vice President

WESTERNBANK PUERTO RICO

By: /s/ Miguel A. Vazquez

Name: Miguel A. Vazquez

Title: President, Business Credit Division

THE FOOTHILL GROUP, INC.

By: /s/ R. Michael Bohannon

Name: R. Michael Bohannon

Title: Senior Vice President

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RATIFICATION OF GUARANTEES

Each of the undersigned Guarantors hereby acknowledges and consents to the foregoing Second
Amendment to Amended and Restated Revolving Credit Agreement dated as of October 16, 2006 (the
“Second Amendment”) among USEC Inc. (“Holdings”), United States Enrichment
Corporation (“Enrichment” and, together with Holdings, the “Borrowers”), the
Lenders party thereto, JPMorgan Chase Bank, N.A., as administrative agent and collateral agent (the
“Administrative Agent”), and the other financial institutions named therein as “agents”,
confirms that the obligations of the Borrowers under the Credit Agreement, as previously amended by
that certain First Amendment to Amended and Restated Revolving Credit Agreement dated as of March
6, 2006, and as amended by the Second Amendment, constitute “Guaranteed Obligations” guarantied by
and entitled to the benefits of each respective Amended and Restated Guarantee dated as of August
18, 2005 executed and delivered by each such Guarantor to the Administrative Agent, the Issuing
Bank, the Lenders and the other Secured Parties (each a “Guarantee” and collectively, the
“Guarantees”), agrees that its respective Guarantee remains in full force and effect and
ratifies and confirms all of its obligations thereunder. Capitalized terms used but not otherwise
defined herein shall have the meanings attributed to them in the Guarantees.

GUARANTORS:

NAC HOLDING INC.

By: /s/ Kent S. Cole

Name: Kent S. Cole

Title: President

NAC INTERNATIONAL INC.

By: /s/ Kent S. Cole

Name: Kent S. Cole

Title: President

3EX-10.82

Exhibit 10.82

MEADE INSTRUMENTS CORP.

1997 STOCK INCENTIVE PLAN

PERFORMANCE SHARE AWARD AGREEMENT

THIS PERFORMANCE SHARE AWARD AGREEMENT (this “Agreement”) is entered into by and between MEADE
INSTRUMENTS CORP., a Delaware corporation (the “Company”), and Steve Muellner (“Employee”) as of
October 18, 2006.

BACKGROUND

WHEREAS, the Company has adopted and the stockholders of the Company have approved the Meade
Instruments Corp. 1997 Stock Incentive Plan (the “Plan”); and

WHEREAS, pursuant to Section 5 of the Plan, the Company, upon approval of the Committee, has
granted a Performance Share Award (the “Award”) to Employee upon the terms and conditions evidenced
hereby, as required by the Plan; and

WHEREAS, the Award has been granted to Employee in addition to, and not in lieu of, any other
form of compensation otherwise payable or to be paid to Employee.

AGREEMENT

NOW, THEREFORE, in consideration of the mutual promises and covenants made herein and the
mutual benefits to be derived herefrom, the parties agree as follows:

	1.	 	Capitalized Terms. Capitalized terms used herein and not otherwise defined herein
shall have the meaning assigned to such terms in the Plan.

	2.	 	Grant of Incentive Award. This Agreement evidences the Company’s grant to Employee,
subject to the terms and conditions hereof and of the Plan, of the Award with respect to the
2007 fiscal year (the “Plan Year”). The benefits with respect to the Award will be calculated
pursuant to the Plan based upon the achievement of the performance objectives set forth herein
during the Plan Year.

	3.	 	Performance Objectives. The total Award Employee shall receive pursuant hereto
shall be based on Employee satisfying certain personal growth objectives set forth on Exhibit
A hereto (the “Personal Objectives”). Upon satisfaction of such Personal Objectives, Employee
shall be entitled to receive an Award of restricted shares of the Company’s Common Stock with
an aggregate market value (i.e., the number of shares granted multiplied by the closing price
of the Company’s Common Stock on the last trading day of the Plan Year) from a minimum award
amount of 0% (the “Minimum Award Amount”) up to a maximum award amount of 40% (the “Maximum
Award Amount”) of Employee’s base salary for the Plan Year pro-rated for the amount of time
Employee was employed with the Company during the Plan Year. The Award amount shall be based
on Employee’s level of achievement of the Personal Objectives as determined in the sole
discretion of the Compensation Committee of the Board of Directors. Any restricted shares
granted pursuant hereto will be subject to a six (6) month restriction period, after which
such restricted shares will be vested and exercisable in full. Any restricted shares to be
granted to Employee pursuant hereto shall be granted to Employee on June 1, 2007.

	4.	 	Restrictions on Transfer. The Award, and any interest thereon or amount payable in
respect thereof, is generally nontransferable as provided in the Plan.

	5.	 	Conditions; Early Termination; Adjustment; Change in Control. Subject to any
employment agreement entered into between Employee and the Company (which shall control)
(“Employment Agreement”), the Award is subject to all of the conditions set forth in the Plan.
The Award (including, but not limited to the Personal Objectives) is subject to adjustment as
contemplated by the Plan. If there should occur a “Change in Control” of the Company (or any
successor), as defined in the Plan, Employee, without limitation on any other rights
hereunder, and regardless of whether or not Employee has satisfied any of the Personal
Objectives shall be entitled to receive no later than one day prior to the effective date of
such Change in Control an amount equal to the Maximum Award Amount hereunder (the number of
restricted shares granted to Employee pursuant to this Agreement shall be calculated based
upon the closing price of the Company’s Common Stock on the day prior to the effective date of
the Change in Control and shall be immediately vested and exercisable in full).

	6.	 	Continuance of Employment. Notwithstanding any commitment of Employee to remain in
the service or employ of the Company (or any affiliate), the Award shall not confer upon
Employee any new or different right with respect to the continuation of his or her service or
employment by the Company (or any affiliate) or alter or interfere in any way with the right
of the Company (or any affiliate) to terminate such service or employment or to change the
compensation of Employee or other terms of his or her service or employment, or otherwise
affect any of the terms or conditions of any separate written employment agreement, except as
expressly provided hereunder.

	7.	 	Manner and Timing of Payment; Withholding Tax. Subject to any changes imposed by or
allowed under the provisions of the Plan, benefits with respect to the Award shall be paid
pursuant to the Plan. Payment shall be made as soon as the Compensation Committee is able to
determine and confirm the level of achievement attained by Employee of the Personal
Objectives, but in no event shall payment be made later than 105 days after the end of the
Plan Year. Employee agrees to pay or provide for payment of all applicable withholding taxes
in accordance with the Plan.

	8.	 	Construction; Amendment. The interpretation, performance and enforcement of this
Agreement shall be governed by the laws of the State of California. This Agreement may only
be amended in writing by an instrument signed by both parties.

	9.	 	Arbitration. As a material inducement to enter into this Agreement, and to the
fullest extend allowable by law, Employee and the Company each hereby agree that any “Claims”
or “Controversies” (as defined below) arising out of or in respect to this Agreement (or its
validity, interpretation or enforcement) that Employee may have against the Company or it
officers, directors, employees, or agents, in their capacity as such, or that the Company may
have against Employee, shall be resolved solely through final and binding arbitration.
Employee and the Company each hereby acknowledge that this agreement to arbitrate means that
Employee and the Company are relinquishing his/her/its rights to either a jury trial or court
trial for the resolution of any claims that Employee and the Company may have against the
other.

“Claims” or “Controversies” arising out of this Agreement mean and include all claims for
breach of this Agreement, harassment and/or discrimination (including sexual harassment and
harassment or discrimination based on race, color, religion, age, sex, sexual orientation,
ancestry, national origin, marital status, military service, pregnancy, physical or mental
disability, medical condition or any other protected class or condition), breach of any
contract or covenant (express or implied), tort claims, violations of public policy,
wrongful termination, whistle-blowing and all other claims relating to this Agreement,
except that claims covered by the Workers’ Compensation Act and claims for unemployment
benefits are not covered by this agreement to arbitrate.

All Claims or Controversies shall be submitted to a single neutral arbitrator. The
arbitration shall take place in Orange County, California, unless otherwise mutually agreed.
The arbitrator shall be mutually agreed-upon by Employee and the Company. If Employee and
the Company cannot agree upon an arbitrator, the selection process shall be governed by the
employment arbitration rules and procedures of the American Arbitration Association (“AAA”).
In any such arbitration, the parties may conduct discovery to the same extent as would be
permitted in a court of law. The arbitrator shall issue a written decision, and shall have
full authority to award all remedies which would be available in court. The Company shall
pay the arbitrator’s fees and any AAA administrative expenses. Any judgment upon the award
rendered by the arbitrator may be entered in any court having jurisdiction thereof.

This bilateral arbitration agreement is to be construed as broadly as is permissible under
relevant law. In connection with any arbitration proceeding commenced hereby, the
prevailing party shall be entitled to reimbursement of its reasonable attorney’s fees and
costs, including arbitrator fees. This agreement to arbitrate and arbitration procedure is
intended to be the exclusive method of resolving all Claims or Controversies as described
above between Employee and the Company and judgment upon the award rendered by the
arbitrator hereunder may be entered in any court having jurisdiction thereof.

	10.	 	General Terms. Subject to any employment agreement or arrangement, the Award and any
payment in respect thereof are subject to, and the Company and Employee agree to be bound by,
the provisions of the Plan that apply to the Award. Such provisions are incorporated herein
by this reference. Employee acknowledges receiving a copy of the Plan and reading and
understanding its applicable provisions.

1

IN WITNESS WHEREOF, the parties have executed this Agreement as of the date and year first
written above.

	 	 	 
	MEADE INSTRUMENTS CORP.,

a Delaware corporation

	 	EMPLOYEE,

an individual
	 
	 	 
	/s/ Mark D. Peterson

	 	/s/ Steve Muellner
	 

	 	 
	By Mark D. Peterson

	 	Name Steve Muellner
	 

	 	 

Title Senior Vice President Address 10314 Woodbridge Street Toluca Lake,
California 91602  

2

Exhibits are excluded

3

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