Commitments and Contingencies	6 Months Ended
Jun. 30, 2013
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES American Centrifuge Plant Project Funding USEC is in the process of developing an updated plan for the financing and commercialization of the American Centrifuge project. Factors that can affect this plan include key variables related to project cost, schedule, market demand and market prices for low enriched uranium, financing costs and other financing terms. USEC has experienced cost pressures due to delays in deployment of the project. The economics of the project are also being increasingly challenged by the current supply/demand imbalance in the market for low enriched uranium and related downward pressure on market prices. USEC does not currently have the remaining government cost-share funding in place for the last three months of the calendar year needed to complete the RD&D program or any financing in place for the project following the completion of the current RD&D program described in Note 4 and will need significant additional financing in order to complete the American Centrifuge Plant. Despite the technical progress being made by the RD&D program, if financing is not in place at the end of the RD&D program, USEC could demobilize or terminate the project in order to preserve its liquidity. USEC could also make a decision at any time to demobilize or terminate the project based on the timing and likelihood of successful commercialization of the American Centrifuge project taking into account the factors above. In the event of a demobilization or termination of the American Centrifuge project, USEC could incur significant costs that could put significant demands on its liquidity. USEC believes a loan guarantee under the DOE Loan Guarantee Program, which was established by the Energy Policy Act of 2005, or other government support is critical to obtaining the funding needed to complete the ACP. In July 2008, USEC applied under the DOE Loan Guarantee Program for $2 billion in U.S. government guaranteed debt financing for the ACP. Instead of moving forward with a conditional commitment for a loan guarantee, in the fall of 2011, DOE proposed a two-year RD&D program for the project. DOE indicated that USEC's application for a DOE loan guarantee would remain pending during the RD&D program but has given USEC no assurance that a successful RD&D program will result in a loan guarantee. In order to obtain a loan guarantee, USEC will need to demonstrate a viable commercialization plan which is dependent on the factors described above. Additional capital beyond the $2 billion of DOE loan guarantee funding that USEC has applied for and USEC's internally generated cash flow will be required to complete the project. USEC has had discussions with Japanese export credit agencies regarding financing up to $1 billion of the cost of completing the ACP, with such potential financing predicated on USEC receiving a DOE loan guarantee. USEC also expects to need at least $1 billion of capital for the project in addition to the DOE loan guarantee and the Japanese export credit agency funding discussed above. The amount of additional capital includes contributions from USEC and is dependent on a number of factors, including the amount of any revised cost estimate and schedule for the project, the amount of contingency or other capital DOE may require as part of a loan guarantee, and the amount of the DOE credit subsidy cost that would be required to be paid in connection with a loan guarantee. USEC currently anticipates the sources for this capital to include cash generated by the project during startup, available USEC cash flow from operations and additional third-party capital. USEC expects the additional third-party capital would be raised at the project level, including through the issuance of additional equity participation. However, in order to successfully raise this capital, USEC needs to develop and validate a viable business plan that supports loan repayment and provides potential investors with an attractive return on investment based on the project's risk profile. The economics of the American Centrifuge project are increasingly challenged under current enrichment market conditions, which have continued to decline during 2013. USEC has no assurances that it will be successful in obtaining this financing and that the delays and cost increases the Company has experienced and market conditions will not adversely affect these efforts. USEC is working to identify cost mitigation actions; however USEC has no assurance that it will be successful. USEC also is uncertain regarding the amount of internally generated cash flow from operations that USEC will have available to finance the project in light of the delays in deployment of the project, reduced cash flow from operations as a result of ceasing enrichment at the Paducah GDP and potential requirements for USEC's internally generated cash flow to satisfy its pension and postretirement benefit and other obligations. The amount of capital that USEC is able to contribute to the project going forward will also impact USEC's share of the ultimate ownership of the project, which would be reduced as a result of raising equity and other capital to deploy the project. Given the current enrichment market conditions and the challenges these conditions present for obtaining the capital necessary for ACP commercialization, USEC is evaluating and pursuing the feasibility of alternatives and the actions necessary to proceed with the commercial deployment of the American Centrifuge technology including the availability of additional government support. USEC has no assurance that it will be successful in achieving any of these measures, including obtaining additional government support that may be necessary to successful commercial deployment, or the timing thereof. Therefore, USEC continues to evaluate its options concerning the American Centrifuge project including its ability to continue the project prior to or upon completion of the RD&D program, further demobilization of or delays in the commercial deployment of the project, and termination of the project. Any such actions may have a material adverse impact on USEC's ability to deploy the American Centrifuge technology, on its liquidity and on the long-term viability of its enrichment business. In order to address the October 1, 2014 maturity of its $530 million of convertible senior notes and increase the likelihood of a successful financing and deployment of the American Centrifuge project and USEC's participation in such project, USEC is engaged with its advisors and certain stakeholders on alternatives for a possible restructuring of its balance sheet. A restructuring of USEC's balance sheet could adversely affect the holders of USEC common stock through dilution or loss in value. However, USEC has no assurance regarding the outcome of any discussions USEC pursues with creditors or other key stakeholders. Milestones under the 2002 DOE-USEC Agreement USEC and DOE are parties to an agreement dated June 17, 2002, as amended (the “2002 DOE-USEC Agreement”), pursuant to which USEC and DOE made long-term commitments directed at resolving issues related to the stability and security of the domestic uranium enrichment industry. The agreement provides that USEC will develop, demonstrate and deploy advanced enrichment technology in accordance with milestones and provides for remedies in the event of a failure to meet a milestone under certain circumstances. The 2002 DOE-USEC Agreement provides DOE with specific remedies if USEC fails to meet a milestone that would materially impact USEC's ability to begin commercial operations of the American Centrifuge Plant on schedule and such delay was within USEC's control or was due to USEC's fault or negligence. These remedies could include terminating the 2002 DOE-USEC Agreement, revoking USEC's access to DOE's U.S. centrifuge technology that USEC requires for the success of the American Centrifuge project and requiring USEC to transfer certain of its rights in the American Centrifuge technology and facilities to DOE, and to reimburse DOE for certain costs associated with the American Centrifuge project. Any of these remedies under the 2002 DOE-USEC Agreement could have a material adverse impact on USEC's business. The 2002 DOE-USEC Agreement provides that if a delaying event beyond the control and without the fault or negligence of USEC occurs which would affect USEC's ability to meet an ACP milestone, DOE and USEC will jointly meet to discuss in good faith possible adjustments to the milestones as appropriate to accommodate the delaying event. Technical Milestones under the June 2012 Cooperative Agreement The June 2012 cooperative agreement with DOE, as amended, includes nine technical milestones for the RD&D program. As of June 30, 2013, five of the milestones have been completed and certified by DOE; one milestone has been completed and documentation has been submitted for certification by DOE; and the final three milestones are targeted for completion at the end of the RD&D program on December 31, 2013. DOE has the right to terminate the cooperative agreement if any of the remaining technical milestones are not met. DOE also has the right to terminate the cooperative agreement if USEC materially fails to comply with the other terms and conditions of the cooperative agreement. Failure to meet the technical milestones under the cooperative agreement could provide a basis for DOE to exercise its remedies under the 2002 DOE-USEC Agreement. In addition, the cooperative agreement contains non-binding performance indicators that are designed to be achieved throughout the RD&D program and ensure that the RD&D program is on track to achieve the milestones and other program objectives. Although the performance indicators are non-binding, the failure to achieve a performance indicator could cause DOE to take actions that are adverse to USEC. By manufacturing the 120 AC100 centrifuges required for the demonstration cascade, the program has met the third out of five performance indicators. Documentation of completion of the fourth performance indicator has been submitted to DOE for certification. Progress on the remaining performance indicator is in line with expectations to achieve the target dates for the performance indicator. 2002 DOE-USEC Agreement - Domestic Enrichment Facilities Under the 2002 DOE-USEC Agreement, USEC agreed to operate the Paducah GDP at a production rate at or above 3.5 million SWU per year and production at Paducah may not be reduced below a minimum of 3.5 million SWU per year until six months before USEC has the permanent addition of 3.5 million SWU per year of new capacity installed based on advanced enrichment technology. By letter dated May 30, 2013, USEC provided notice to DOE under the 2002 DOE-USEC Agreement that it would cease enrichment at the Paducah GDP at the conclusion of the agreements related to the one-year, multi-party depleted uranium enrichment program on May 31, 2013. Under the 2002 DOE-USEC Agreement, DOE can transition operations of Paducah from USEC operation to ensure the continuity of domestic enrichment operations and the fulfillment of supply contracts. USEC is in discussions with DOE regarding an agreement related to the transition of the Paducah GDP and while USEC believes maintaining USEC's access to the Paducah GDP would be the best course of action to permit the fulfillment of supply contracts, there can be no assurance that DOE will not seek to exercise this right in a manner that will result in material adverse impacts to USEC. NYSE Listing Standards Notices On May 8, 2012, USEC received notice from the NYSE that the average closing price of its common stock was below the NYSE's continued listing criteria relating to minimum share price. The NYSE listing requirements require that a company's common stock trade at a minimum average closing price of $1.00 over a consecutive 30 trading-day period. On July 1, 2013, USEC effectuated a reverse stock split in order to regain compliance with the NYSE continued listing criteria related to minimum share price. This action resulted in USEC's closing share price exceeding $1.00 per share, and the condition will be deemed cured if the average closing price remains above the level for at least the following 30 trading days. Subject to the NYSE's rules, during the cure period, USEC's common stock will continue to be listed and trade on the NYSE, subject to its continued compliance with the NYSE's other applicable listing rules. On April 30, 2013, USEC received notice from the NYSE that the decline in USEC's total market capitalization has caused it to be out of compliance with another of the NYSE's continued listing standards. The NYSE listing requirements require that a company maintain an average market capitalization of not less than $50 million over a consecutive 30 trading-day period where the company's total stockholders' equity is less than $50 million. In accordance with the NYSE's rules, USEC submitted a plan advising the NYSE of definitive action it has taken, or is taking, that would bring it into conformity with the market capitalization listing standards within 18 months of receipt of the letter. On August 1, 2013, the NYSE accepted USEC's plan of compliance and USEC's common stock will continue to be listed on the NYSE during the 18-month cure period, subject to the compliance with other NYSE continued listing standards and continued periodic review by the NYSE of USEC's progress with respect to its plan. USEC's plan outlines initiatives USEC must execute by quarter. These initiatives include the successful completion of American Centrifuge plant development milestones, as well as the successful execution of the Company's Russian supply agreement and the Company's potential balance sheet restructuring. The NYSE has notified us that if USEC does not achieve these financial and operational goals, the Company will be subject to NYSE trading suspension at the point the initiative or goal is not met. In addition, the NYSE can at any time suspend trading in a security and delist the stock if it deems it necessary for the protection of investors. The NYSE can take accelerated listing action if USEC's common stock trades at levels viewed to be “abnormally low” over a sustained period of time. USEC would also be subject to immediate suspension and de-listing from the NYSE if its average market capitalization is less than $15 million over a consecutive 30 trading-day period or if it were to file or announce an intent to file under any of the sections of the bankruptcy law. During July 2013, USEC's market capitalization fell below $15 million for several days. Even if USEC meets the numerical listing standards above, the NYSE reserves the right to assess the suitability of the continued listing of a company on a case-by-case basis whenever it deems it appropriate and will consider factors such as unsatisfactory financial conditions and/or operating results or inability to meet debt obligations or adequately finance operations. Under the terms of USEC's convertible notes, a "fundamental change" is triggered if USEC's shares of common stock are not listed for trading on any of the NYSE, the American Stock Exchange (now NYSE-MKT), the NASDAQ Global Market or the NASDAQ Global Select Market, and the holders of the notes can require USEC to repurchase the notes at par for cash. USEC has no assurance that it would be eligible for listing on an alternate exchange in light of its market capitalization, stockholders' deficit and net losses. USEC's receipt of a NYSE continued listing standards notification described above did not trigger a fundamental change. In the event a fundamental change under the convertible notes is triggered, USEC does not have adequate cash to repurchase the notes. A failure by USEC to offer to repurchase the notes or to repurchase the notes after the occurrence of a fundamental change is an event of default under the indenture governing the notes. The occurrence of a fundamental change under the convertible notes that permits the holders of the convertible notes to require a repurchase for cash is an event of default under USEC's credit facility. Accordingly, the exercise of remedies by holders of USEC's convertible notes or lenders under USEC's credit facility as a result of a delisting would have a material adverse effect on USEC's liquidity and financial condition. Potential ERISA Section 4062(e) Liability USEC is in discussions with the Pension Benefit Guaranty Corporation (“PBGC”) regarding the impact of USEC's de-lease of the Portsmouth gaseous diffusion facilities and related transition of employees performing government services work to DOE's new decontamination and decommissioning (“D&D”) contractor on September 30, 2011. USEC notified the PBGC of this occurrence and the PBGC has informally advised USEC of its preliminary view that the Portsmouth site transition is a cessation of operations that triggers liability under ERISA Section 4062(e) and that its preliminary estimate is that the ERISA Section 4062(e) liability (computed taking into account the plan's underfunding on a termination basis, which amount differs from that computed for GAAP purposes) for the Portsmouth site transition is approximately $130 million. USEC has informed the PBGC that it does not agree that the Portsmouth de-lease and transition of employees constituted a cessation of operations that triggered liability under ERISA Section 4062(e). USEC also disputes the amount of the PBGC's preliminary calculation of the potential ERISA Section 4062(e) liability. In addition, USEC believes that DOE is responsible for a significant portion of any pension costs associated with the transition of employees at Portsmouth. However, USEC has not reached a resolution with the PBGC and USEC has no assurance that the PBGC will agree with it or will not pursue a requirement for it to accelerate funding or take other actions to provide security. USEC is also in discussions with the PBGC regarding the cessation of enrichment at the Paducah GDP and related transition of employees as part of future reductions in force. In addition, a demobilization or termination of the American Centrifuge project could raise doubt about the long-term viability of USEC's enrichment business and the PBGC could take the position that a demobilization of the American Centrifuge project, either alone or taken together with actions related to the transition of the Paducah GDP, create potential liabilities under ERISA Section 4062(e). Legal Matters USEC is subject to various legal proceedings and claims, either asserted or unasserted, which arise in the ordinary course of business. While the outcome of these claims cannot be predicted with certainty, USEC does not believe that the outcome of any of these legal matters will have a material adverse effect on its results of operations, cash flows or financial condition. On June 27, 2011, a complaint was filed in the United States District Court for the Southern District of Ohio, Eastern Division, against USEC by a former Portsmouth GDP employee claiming that USEC owes severance benefits to him and other similarly situated employees that have transitioned or will transition to the DOE D&D contractor. The plaintiff amended its complaint on August 31, 2011 and February 10, 2012, among other things, to limit the purported class of similarly situated employees to salaried employees at the Portsmouth site who transitioned to the D&D contractor and are allegedly eligible for or owed benefits. On October 11, 2012, the United States District Court granted USEC's motion to dismiss the complaint and dismissed Plaintiffs' motion for class certification as moot. The Plaintiffs filed an appeal on January 18, 2013 and on July 19, 2013, the U.S. Court of Appeals for the Sixth Circuit upheld the District Court decision and dismissed the Plaintiffs' appeal. The Plaintiffs have ninety days to seek review of the decision by the United States Supreme Court by filing a writ of certiorari. USEC has not accrued any amounts for this matter.

COMMITMENTS AND CONTINGENCIES

American Centrifuge Plant

Project Funding

USEC is in the process of developing an updated plan for the financing and commercialization of the American Centrifuge project. Factors that can affect this plan include key variables related to project cost, schedule, market demand and market prices for low enriched uranium, financing costs and other financing terms. USEC has experienced cost pressures due to delays in deployment of the project. The economics of the project are also being increasingly challenged by the current supply/demand imbalance in the market for low enriched uranium and related downward pressure on market prices. USEC does not currently have the remaining government cost-share funding in place for the last three months of the calendar year needed to complete the RD&D program or any financing in place for the project following the completion of the current RD&D program described in Note 4 and will need significant additional financing in order to complete the American Centrifuge Plant. Despite the technical progress being made by the RD&D program, if financing is not in place at the end of the RD&D program, USEC could demobilize or terminate the project in order to preserve its liquidity. USEC could also make a decision at any time to demobilize or terminate the project based on the timing and likelihood of successful commercialization of the American Centrifuge project taking into account the factors above. In the event of a demobilization or termination of the American Centrifuge project, USEC could incur significant costs that could put significant demands on its liquidity.

USEC believes a loan guarantee under the DOE Loan Guarantee Program, which was established by the Energy Policy Act of 2005, or other government support is critical to obtaining the funding needed to complete the ACP. In July 2008, USEC applied under the DOE Loan Guarantee Program for $2 billion in U.S. government guaranteed debt financing for the ACP. Instead of moving forward with a conditional commitment for a loan guarantee, in the fall of 2011, DOE proposed a two-year RD&D program for the project. DOE indicated that USEC's application for a DOE loan guarantee would remain pending during the RD&D program but has given USEC no assurance that a successful RD&D program will result in a loan guarantee. In order to obtain a loan guarantee, USEC will need to demonstrate a viable commercialization plan which is dependent on the factors described above. Additional capital beyond the $2 billion of DOE loan guarantee funding that USEC has applied for and USEC's internally generated cash flow will be required to complete the project. USEC has had discussions with Japanese export credit agencies regarding financing up to $1 billion of the cost of completing the ACP, with such potential financing predicated on USEC receiving a DOE loan guarantee.

USEC also expects to need at least $1 billion of capital for the project in addition to the DOE loan guarantee and the Japanese export credit agency funding discussed above. The amount of additional capital includes contributions from USEC and is dependent on a number of factors, including the amount of any revised cost estimate and schedule for the project, the amount of contingency or other capital DOE may require as part of a loan guarantee, and the amount of the DOE credit subsidy cost that would be required to be paid in connection with a loan guarantee. USEC currently anticipates the sources for this capital to include cash generated by the project during startup, available USEC cash flow from operations and additional third-party capital. USEC expects the additional third-party capital would be raised at the project level, including through the issuance of additional equity participation.

However, in order to successfully raise this capital, USEC needs to develop and validate a viable business plan that supports loan repayment and provides potential investors with an attractive return on investment based on the project's risk profile. The economics of the American Centrifuge project are increasingly challenged under current enrichment market conditions, which have continued to decline during 2013. USEC has no assurances that it will be successful in obtaining this financing and that the delays and cost increases the Company has experienced and market conditions will not adversely affect these efforts. USEC is working to identify cost mitigation actions; however USEC has no assurance that it will be successful. USEC also is uncertain regarding the amount of internally generated cash flow from operations that USEC will have available to finance the project in light of the delays in deployment of the project, reduced cash flow from operations as a result of ceasing enrichment at the Paducah GDP and potential requirements for USEC's internally generated cash flow to satisfy its pension and postretirement benefit and other obligations. The amount of capital that USEC is able to contribute to the project going forward will also impact USEC's share of the ultimate ownership of the project, which would be reduced as a result of raising equity and other capital to deploy the project.

Given the current enrichment market conditions and the challenges these conditions present for obtaining the capital necessary for ACP commercialization, USEC is evaluating and pursuing the feasibility of alternatives and the actions necessary to proceed with the commercial deployment of the American Centrifuge technology including the availability of additional government support. USEC has no assurance that it will be successful in achieving any of these measures, including obtaining additional government support that may be necessary to successful commercial deployment, or the timing thereof. Therefore, USEC continues to evaluate its options concerning the American Centrifuge project including its ability to continue the project prior to or upon completion of the RD&D program, further demobilization of or delays in the commercial deployment of the project, and termination of the project. Any such actions may have a material adverse impact on USEC's ability to deploy the American Centrifuge technology, on its liquidity and on the long-term viability of its enrichment business.

In order to address the October 1, 2014 maturity of its $530 million of convertible senior notes and increase the likelihood of a successful financing and deployment of the American Centrifuge project and USEC's participation in such project, USEC is engaged with its advisors and certain stakeholders on alternatives for a possible restructuring of its balance sheet. A restructuring of USEC's balance sheet could adversely affect the holders of USEC common stock through dilution or loss in value. However, USEC has no assurance regarding the outcome of any discussions USEC pursues with creditors or other key stakeholders.

Milestones under the 2002 DOE-USEC Agreement

USEC and DOE are parties to an agreement dated June 17, 2002, as amended (the “2002 DOE-USEC Agreement”), pursuant to which USEC and DOE made long-term commitments directed at resolving issues related to the stability and security of the domestic uranium enrichment industry. The agreement provides that USEC will develop, demonstrate and deploy advanced enrichment technology in accordance with milestones and provides for remedies in the event of a failure to meet a milestone under certain circumstances.

The 2002 DOE-USEC Agreement provides DOE with specific remedies if USEC fails to meet a milestone that would materially impact USEC's ability to begin commercial operations of the American Centrifuge Plant on schedule and such delay was within USEC's control or was due to USEC's fault or negligence. These remedies could include terminating the 2002 DOE-USEC Agreement, revoking USEC's access to DOE's U.S. centrifuge technology that USEC requires for the success of the American Centrifuge project and requiring USEC to transfer certain of its rights in the American Centrifuge technology and facilities to DOE, and to reimburse DOE for certain costs associated with the American Centrifuge project. Any of these remedies under the 2002 DOE-USEC Agreement could have a material adverse impact on USEC's business.

The 2002 DOE-USEC Agreement provides that if a delaying event beyond the control and without the fault or negligence of USEC occurs which would affect USEC's ability to meet an ACP milestone, DOE and USEC will jointly meet to discuss in good faith possible adjustments to the milestones as appropriate to accommodate the delaying event.

Technical Milestones under the June 2012 Cooperative Agreement

The June 2012 cooperative agreement with DOE, as amended, includes nine technical milestones for the RD&D program. As of June 30, 2013, five of the milestones have been completed and certified by DOE; one milestone has been completed and documentation has been submitted for certification by DOE; and the final three milestones are targeted for completion at the end of the RD&D program on December 31, 2013. DOE has the right to terminate the cooperative agreement if any of the remaining technical milestones are not met. DOE also has the right to terminate the cooperative agreement if USEC materially fails to comply with the other terms and conditions of the cooperative agreement. Failure to meet the technical milestones under the cooperative agreement could provide a basis for DOE to exercise its remedies under the 2002 DOE-USEC Agreement.

In addition, the cooperative agreement contains non-binding performance indicators that are designed to be achieved throughout the RD&D program and ensure that the RD&D program is on track to achieve the milestones and other program objectives. Although the performance indicators are non-binding, the failure to achieve a performance indicator could cause DOE to take actions that are adverse to USEC. By manufacturing the 120 AC100 centrifuges required for the demonstration cascade, the program has met the third out of five performance indicators. Documentation of completion of the fourth performance indicator has been submitted to DOE for certification. Progress on the remaining performance indicator is in line with expectations to achieve the target dates for the performance indicator.

2002 DOE-USEC Agreement - Domestic Enrichment Facilities

Under the 2002 DOE-USEC Agreement, USEC agreed to operate the Paducah GDP at a production rate at or above 3.5 million SWU per year and production at Paducah may not be reduced below a minimum of 3.5 million SWU per year until six months before USEC has the permanent addition of 3.5 million SWU per year of new capacity installed based on advanced enrichment technology. By letter dated May 30, 2013, USEC provided notice to DOE under the 2002 DOE-USEC Agreement that it would cease enrichment at the Paducah GDP at the conclusion of the agreements related to the one-year, multi-party depleted uranium enrichment program on May 31, 2013. Under the 2002 DOE-USEC Agreement, DOE can transition operations of Paducah from USEC operation to ensure the continuity of domestic enrichment operations and the fulfillment of supply contracts. USEC is in discussions with DOE regarding an agreement related to the transition of the Paducah GDP and while USEC believes maintaining USEC's access to the Paducah GDP would be the best course of action to permit the fulfillment of supply contracts, there can be no assurance that DOE will not seek to exercise this right in a manner that will result in material adverse impacts to USEC.

NYSE Listing Standards Notices

On May 8, 2012, USEC received notice from the NYSE that the average closing price of its common stock was below the NYSE's continued listing criteria relating to minimum share price. The NYSE listing requirements require that a company's common stock trade at a minimum average closing price of $1.00 over a consecutive 30 trading-day period. On July 1, 2013, USEC effectuated a reverse stock split in order to regain compliance with the NYSE continued listing criteria related to minimum share price. This action resulted in USEC's closing share price exceeding $1.00 per share, and the condition will be deemed cured if the average closing price remains above the level for at least the following 30 trading days. Subject to the NYSE's rules, during the cure period, USEC's common stock will continue to be listed and trade on the NYSE, subject to its continued compliance with the NYSE's other applicable listing rules.

On April 30, 2013, USEC received notice from the NYSE that the decline in USEC's total market capitalization has caused it to be out of compliance with another of the NYSE's continued listing standards. The NYSE listing requirements require that a company maintain an average market capitalization of not less than $50 million over a consecutive 30 trading-day period where the company's total stockholders' equity is less than $50 million. In accordance with the NYSE's rules, USEC submitted a plan advising the NYSE of definitive action it has taken, or is taking, that would bring it into conformity with the market capitalization listing standards within 18 months of receipt of the letter. On August 1, 2013, the NYSE accepted USEC's plan of compliance and USEC's common stock will continue to be listed on the NYSE during the 18-month cure period, subject to the compliance with other NYSE continued listing standards and continued periodic review by the NYSE of USEC's progress with respect to its plan. USEC's plan outlines initiatives USEC must execute by quarter. These initiatives include the successful completion of American Centrifuge plant development milestones, as well as the successful execution of the Company's Russian supply agreement and the Company's potential balance sheet restructuring. The NYSE has notified us that if USEC does not achieve these financial and operational goals, the Company will be subject to NYSE trading suspension at the point the initiative or goal is not met.

In addition, the NYSE can at any time suspend trading in a security and delist the stock if it deems it necessary for the protection of investors. The NYSE can take accelerated listing action if USEC's common stock trades at levels viewed to be “abnormally low” over a sustained period of time. USEC would also be subject to immediate suspension and de-listing from the NYSE if its average market capitalization is less than $15 million over a consecutive 30 trading-day period or if it were to file or announce an intent to file under any of the sections of the bankruptcy law. During July 2013, USEC's market capitalization fell below $15 million for several days. Even if USEC meets the numerical listing standards above, the NYSE reserves the right to assess the suitability of the continued listing of a company on a case-by-case basis whenever it deems it appropriate and will consider factors such as unsatisfactory financial conditions and/or operating results or inability to meet debt obligations or adequately finance operations.

Under the terms of USEC's convertible notes, a "fundamental change" is triggered if USEC's shares of common stock are not listed for trading on any of the NYSE, the American Stock Exchange (now NYSE-MKT), the NASDAQ Global Market or the NASDAQ Global Select Market, and the holders of the notes can require USEC to repurchase the notes at par for cash. USEC has no assurance that it would be eligible for listing on an alternate exchange in light of its market capitalization, stockholders' deficit and net losses. USEC's receipt of a NYSE continued listing standards notification described above did not trigger a fundamental change. In the event a fundamental change under the convertible notes is triggered, USEC does not have adequate cash to repurchase the notes. A failure by USEC to offer to repurchase the notes or to repurchase the notes after the occurrence of a fundamental change is an event of default under the indenture governing the notes. The occurrence of a fundamental change under the convertible notes that permits the holders of the convertible notes to require a repurchase for cash is an event of default under USEC's credit facility. Accordingly, the exercise of remedies by holders of USEC's convertible notes or lenders under USEC's credit facility as a result of a delisting would have a material adverse effect on USEC's liquidity and financial condition.

Potential ERISA Section 4062(e) Liability

USEC is in discussions with the Pension Benefit Guaranty Corporation (“PBGC”) regarding the impact of USEC's de-lease of the Portsmouth gaseous diffusion facilities and related transition of employees performing government services work to DOE's new decontamination and decommissioning (“D&D”) contractor on September 30, 2011. USEC notified the PBGC of this occurrence and the PBGC has informally advised USEC of its preliminary view that the Portsmouth site transition is a cessation of operations that triggers liability under ERISA Section 4062(e) and that its preliminary estimate is that the ERISA Section 4062(e) liability (computed taking into account the plan's underfunding on a termination basis, which amount differs from that computed for GAAP purposes) for the Portsmouth site transition is approximately $130 million. USEC has informed the PBGC that it does not agree that the Portsmouth de-lease and transition of employees constituted a cessation of operations that triggered liability under ERISA Section 4062(e). USEC also disputes the amount of the PBGC's preliminary calculation of the potential ERISA Section 4062(e) liability. In addition, USEC believes that DOE is responsible for a significant portion of any pension costs associated with the transition of employees at Portsmouth. However, USEC has not reached a resolution with the PBGC and USEC has no assurance that the PBGC will agree with it or will not pursue a requirement for it to accelerate funding or take other actions to provide security. USEC is also in discussions with the PBGC regarding the cessation of enrichment at the Paducah GDP and related transition of employees as part of future reductions in force. In addition, a demobilization or termination of the American Centrifuge project could raise doubt about the long-term viability of USEC's enrichment business and the PBGC could take the position that a demobilization of the American Centrifuge project, either alone or taken together with actions related to the transition of the Paducah GDP, create potential liabilities under ERISA Section 4062(e).

Legal Matters

USEC is subject to various legal proceedings and claims, either asserted or unasserted, which arise in the ordinary course of business. While the outcome of these claims cannot be predicted with certainty, USEC does not believe that the outcome of any of these legal matters will have a material adverse effect on its results of operations, cash flows or financial condition.

On June 27, 2011, a complaint was filed in the United States District Court for the Southern District of Ohio, Eastern Division, against USEC by a former Portsmouth GDP employee claiming that USEC owes severance benefits to him and other similarly situated employees that have transitioned or will transition to the DOE D&D contractor. The plaintiff amended its complaint on August 31, 2011 and February 10, 2012, among other things, to limit the purported class of similarly situated employees to salaried employees at the Portsmouth site who transitioned to the D&D contractor and are allegedly eligible for or owed benefits. On October 11, 2012, the United States District Court granted USEC's motion to dismiss the complaint and dismissed Plaintiffs' motion for class certification as moot. The Plaintiffs filed an appeal on January 18, 2013 and on July 19, 2013, the U.S. Court of Appeals for the Sixth Circuit upheld the District Court decision and dismissed the Plaintiffs' appeal. The Plaintiffs have ninety days to seek review of the decision by the United States Supreme Court by filing a writ of certiorari. USEC has not accrued any amounts for this matter.