Since the 1940s, one mission of DOE and its predecessor agencies has been processing uranium as a source of nuclear material for defense and commercial purposes. A key step in this process is the enrichment of natural uranium, which increases its concentration of uranium-235, the isotope of uranium that undergoes fission to release enormous amounts of energy. Before it can be enriched, natural uranium must be chemically converted into uranium hexafluoride. The enrichment process results in two principal products: (1) enriched uranium hexafluoride, which can be further processed for specific uses, such as nuclear weapons or fuel for nuclear power plants; and (2) leftover "tails" of uranium hexafluoride. These tails are also known as depleted uranium because the material is depleted in uranium-235 compared with natural uranium. Since 1993, uranium enrichment activities at DOE-owned uranium enrichment plants have been performed by the U.S. Enrichment Corporation (USEC), formerly a wholly owned government corporation that was privatized in 1998. However, DOE still maintains over 700,000 metric tons of depleted uranium tails in about 63,000 metal cylinders in storage yards at its Paducah, Kentucky, and Portsmouth, Ohio, enrichment plants (see figure 1). It must safely maintain these cylinders because the tails are dangerous to human health and the environment. Uranium hexafluoride is radioactive and forms extremely corrosive and potentially lethal compounds if it contacts water. In addition, DOE also maintains large inventories of natural and enriched uranium that are also surplus to the department's needs. Tails have historically been considered a waste product because considerable enrichment processing is required to further extract the remaining useful quantities of uranium-235. In the past, low uranium prices meant that these enrichment services would cost more than the relatively small amount of uranium-235 extracted would be worth. However, an increase in uranium prices--from approximately $21 per kilogram of uranium in the form of uranium hexafluoride in November 2000 to about $160 per kilogram in May 2011--has potentially made it profitable to re-enrich some tails to further extract uranium-235. Even with the current higher uranium prices, however, only DOE's tails with higher concentrations of uranium-235 (at least 0.3 percent) could be profitably re- enriched, according to industry officials. DOE's potential options for its tails include selling the tails "as is," re- enriching them, or storing them indefinitely. However, DOE's legal authority to sell the tails in their current form is doubtful. We found that DOE generally has authority to carry out the re-enrichment and storage options. As we said earlier, DOE issued a comprehensive uranium management plan in December 2008 in response to a recommendation in our March 2008 report. In this plan, DOE stated that it would begin selling or re-enriching depleted uranium in 2009. However, to date, DOE has not done so and, according to DOE officials, has no current plans to sell or re- enrich this material. While selling the tails in their current unprocessed form is a potential option, we believe that DOE's authority to conduct such sales is doubtful because of specific statutory language in legislation governing DOE's disposition of its uranium. In 1996, Congress enacted section 3112 of the USEC Privatization Act, which limits DOE's general authority, under the Atomic Energy Act or otherwise, to sell or transfer uranium. In particular, section 3112 explicitly bars DOE from selling or transferring "any uranium"--including but not specifically limited to certain forms of natural and enriched uranium--"except as consistent with this section." Section 3112 then specifies conditions for DOE's sale or transfer of natural and enriched uranium of various types, including conditions in section 3112(d) for sale of natural and low-enriched uranium from DOE's inventory. To ensure the domestic uranium market is not flooded with large amounts of government material, in section 3112(d), Congress required DOE to determine that any such inventory sales will not have a material adverse impact on the domestic uranium industry. Congress also required in section 3112(d) that DOE determine it will receive adequate payment--at least "fair market value"--if it sells this uranium and that DOE obtain a determination from the President that such materials are not necessary for national security. However, neither section 3112(d) nor any other provision of section 3112 explicitly provides conditions for DOE to transfer or sell depleted uranium. Because section 3112(a) states that DOE may not "transfer or sell any uranium...except as consistent with this section," and because no other part of section 3112 sets out the conditions for DOE to transfer or sell depleted uranium, we believe that under rules of statutory construction, DOE likely lacks authority to sell the tails. While courts have not addressed this question before and thus the outcome is not free from doubt, this interpretation applies the plain language of the statute. It also respects the policy considerations and choices Congress made in 1996 when presented with the disposition of DOE's valuable uranium in a crowded and price-sensitive market. This reading of DOE's authority is consistent with how courts address changes in circumstances after a law is passed: Statutes written in comprehensive terms apply to unanticipated circumstances if the new circumstances reasonably fall within the scope of the plain language. Thus, under the current terms of section 3112, DOE's sale of its tails would be covered by the statute's general prohibition on sale of uranium, even if tails were not part of the universe Congress explicitly had in mind when it enacted the statute in 1996. Should Congress grant DOE the needed legal authority by amending the USEC Privatization Act or through other legislation, firms such as nuclear power utilities and enrichment companies would be interested in purchasing at least that portion of the tails with higher concentrations of extractable uranium-235 as a valuable source for nuclear fuel. For example, our March 2008 report stated that officials from 8 of 10 U.S. nuclear utilities indicated tentative interest in such a purchase. Individual utilities were often interested in limited quantities of DOE's tails because they were concerned about depending upon a single source to fulfill all of their uranium requirements. Multiple utilities acting together as a consortium could mitigate these concerns and purchase larger quantities of tails. The report also noted that some enrichment firms also told us of some interest in purchasing portions of the inventory, but their anticipated excess enrichment capacity to process the tails into a marketable form affected both the quantity of tails they would purchase and the timing of any purchase. Our March 2008 report noted that potential buyers suggested various commercial arrangements, including purchasing the tails through a competitive sale, such as an auction, or through negotiations with DOE. However, industry officials told us that buyers would discount, perhaps steeply, their offered prices to make buying tails attractive compared with purchasing natural uranium on the open market. That is, DOE might get a discounted price for the tails to compensate buyers for additional risks, such as rising enrichment costs or buyers' inability to obtain sufficient enrichment services. In addition, potential buyers noted that any purchase would depend on confirming certain information, such as that the tails were free of contaminants that could cause nuclear fuel production problems and that the cylinders containing the tails--some of which are 50 years old and may not meet transportation standards--could be safely shipped. Although DOE's legal authority to sell the tails in their current form is doubtful, DOE has the general legal option of re-enriching the tails and then selling the resulting natural or enriched uranium. DOE would have to contract for enrichment services commercially because the department no longer operates enrichment facilities itself. Furthermore, DOE would have to find a company with excess enrichment capacity beyond its current operations, which may be particularly difficult if large amounts of enrichment processing were required. Within the United States today, for example, there are only two operating enrichment facilities: DOE's USEC- run Paducah, Kentucky, plant and the URENCO USA facility located near Eunice, New Mexico. In the case of the Paducah plant, almost all of its enrichment capacity is already being used through 2012, when the plant may stop operating. In the case of URENCO USA, the facility is still under construction and it is not yet operating at full capacity. Other companies are also constructing or planning to construct new enrichment facilities in the United States that potentially could be used to re-enrich DOE's tails. Although DOE would have to pay for re-enrichment, it might obtain more value from selling the re-enriched uranium instead of the tails if its re- enrichment costs were less than the discount it would have to offer to sell the tails as is. Representatives of enrichment firms with whom we spoke at the time of our 2008 report told us they would be interested in re-enriching the tails for a fee. The quantity of tails they would re-enrich annually would depend on the available excess enrichment capacity at their facilities. Additionally, as noted above, prior to selling any natural or enriched uranium that results from re-enriching tails, DOE would be required under section 3112(d) of the USEC Privatization Act to determine that sale of the material would not have a material adverse impact on the domestic uranium industry and that the price paid to DOE would provide at least fair market value. Section 3112(d) also would require DOE to obtain the President's determination that the material is not needed for national security. DOE Could Store the Tails DOE also has the general legal option to store the tails indefinitely. In the late 1990s, when relatively low uranium prices meant that tails were viewed as waste, DOE developed a plan for the safe, long-term storage of the material. DOE has constructed new facilities at its Paducah plant and its closed Portsmouth uranium enrichment plant to chemically convert its tails into a more stable and safer uranium compound that is suitable for long-term storage. The facilities are currently undergoing system checks and once they begin operating in 2011, DOE estimates it will take approximately 25 years to convert its existing tails inventory. As our March 2008 report noted, storing the tails indefinitely could prevent DOE from taking advantage of the large increase in uranium prices to obtain potentially large amounts of revenue from material that was once viewed as waste. DOE would also continue to incur costs associated with storing and maintaining the cylinders containing the tails. These costs amount to about $4 million annually. Sale (if authorized) or re-enrichment of some of DOE's tails could also reduce the amount of tails that would need to be converted and, thereby, save DOE some conversion costs. Moreover, once the tails were converted into a more stable form of uranium oxide, DOE's costs to re-enrich the tails would be higher if it later decided to pursue this approach. This is because of the cost of converting the uranium oxide back to uranium hexafluoride, a step that would be required for re-enrichment. However, according to DOE officials, after the conversion plants begin to operate, the plants would first convert DOE's lower concentration tails because they most likely would not be economically worthwhile to re-enrich. This would give DOE additional time to sell or re-enrich the more valuable higher-concentration tails. Our March 2008 report noted that DOE had been developing a plan since 2005 to sell excess uranium from across its inventories of depleted, natural, and enriched uranium to generate revenues for the U.S. Treasury. In March 2008, DOE issued a policy statement that established a general framework for how DOE plans to manage its inventories. However, we noted that the March 2008 policy statement was not a comprehensive assessment of the sales, re-enrichment, or storage options for DOE's tails. The policy statement lacked specific information on the types and quantities of uranium that the department has in its inventory. Furthermore, the policy statement did not discuss whether it would be more advantageous to sell the higher-concentration tails as is (if authorized) or to re-enrich them. It also did not contain details on when any sales or re-enrichment may occur or DOE's legal authority to carry out those options under section 3112 of the USEC Privatization Act. It also lacked information on the uranium market conditions that would influence any DOE decision to potentially sell or re-enrich tails. Further, it did not analyze the impact of such a decision on the domestic uranium industry, and it did not provide guidance on how a decision should be altered in the event that market conditions change. Although the policy statement stated that DOE would identify categories of tails that have the greatest potential market value and that the department would conduct cost-benefit analyses to determine what circumstances would justify re-enriching and/or selling potentially valuable tails, it did not have specific milestones for doing so. Instead, the policy statement stated that this effort will occur "in the near future." Our March 2008 report therefore recommended that DOE should complete the development of a comprehensive uranium management assessment as soon as possible. We stated that the assessment should contain detailed information on the types and quantities of depleted, natural, and enriched uranium the department currently manages and a comprehensive assessment of DOE's options for this material, including the department's authority to implement these options. Furthermore, we stated that the assessment should analyze the impact of each of these options on the domestic uranium industry and provide details on how implementation of any of these options should be adjusted in the event that market conditions change. In December 2008, DOE issued an "Excess Uranium Inventory Management Plan." Among other things, the plan states that DOE would begin selling or re-enriching depleted uranium in 2009. However, the department has not, to date, sold or re-enriched any of its depleted uranium. According to DOE officials, the department currently has no plans to sell or re-enrich this material. At current uranium prices, we estimate DOE's tails to have a net value of $4.2 billion; however, we would like to emphasize that this estimate is very sensitive to changing uranium prices, which recently have been extremely volatile, as well as to the availability of enrichment capacity. This estimate assumes the May 2011 published uranium price of $160 per kilogram of natural uranium in the form of uranium hexafluoride and $153 per separative work unit--the standard measure of uranium enrichment services. Our model also assumes the capacity to re-enrich the higher- concentration tails and subtracts the costs of the needed enrichment services. It also takes into account the cost savings DOE would realize from reductions in the amount of tails that needed conversion to a more stable form for storage, as well as the costs to convert any residual tails. As noted above, this estimate is very sensitive to price variations for uranium as well as to the availability of enrichment services. Uranium prices are very volatile, and a sharp rise or fall in prices could greatly affect the value of the tails. For example, our March 2008 report estimated the tails had a net value of $7.6 billion. This estimate was based on the February 2008 published uranium price of $200 per kilogram of natural uranium and $145 per separative work unit. Prices for uranium have since fallen from $200 per kilogram of natural uranium to $160 per kilogram. There is no consensus among industry players whether uranium prices will fall or rise in the future or on the magnitude of any future price changes. Furthermore, the introduction of additional uranium onto the market by the sale of large quantities of DOE depleted, natural, or enriched uranium--assuming DOE obtains authority to sell depleted uranium--could also lead to lower uranium prices. Therefore, according to DOE's uranium management plan, DOE is limited to selling no more than 10 percent of the domestic demand for uranium annually. This is intended to help achieve DOE's goal of minimizing the negative effects of DOE's sales on domestic uranium producers. However, this limit lengthens the time necessary to market DOE's uranium, increasing the time the department is exposed to uranium price volatility. These factors all result in great uncertainty of the valuation of DOE's tails. In addition, the enrichment capacity available for re-enriching tails may be limited, and the costs of these enrichment services are uncertain. For example, at the time of our March 2008 report, USEC only had a small amount of excess enrichment capacity at its Paducah plant. If it used the spare capacity, USEC would only be able to re-enrich about 14 percent of DOE's most economically attractive tails between now and the possible closing of the plant in 2012. Although USEC officials told us at the time of our March 2008 report that the company was willing to explore options to extend the Paducah plant's operations beyond 2012 and dedicate Paducah's capacity solely to re-enriching DOE's tails after this point, negotiations between the company and DOE would be needed to determine the enrichment costs that would be paid by DOE. The Paducah plant uses a technology developed in the 1940s that results in relatively high production costs. Even if the Paducah plant were to be dedicated entirely to re-enriching DOE tails after 2012, over a decade would be required to complete the work because of limitations on the annual volume of tails that can be physically processed by the plant. This lengthy period of time would expose DOE to risks of uranium price fluctuations and increasing maintenance costs. USEC and other companies are constructing or planning to construct enrichment plants in the United States that utilize newer, lower-cost technology. However, these facilities are not expected to be completed until some time over the next decade. It is unclear exactly when these facilities would be fully operating, the extent to which they will have excess enrichment capacity to re-enrich DOE's tails, and what enrichment costs DOE could expect to pay. For example, the size of the fee DOE may have to pay an enrichment company to re-enrich its tails would be subject to negotiation between DOE and the company. In summary, as was the case when we reported in March 2008, the U.S. government has an opportunity to gain some benefit from material that was once considered a liability. Under current law, however, one potential avenue for dealing with DOE's depleted uranium tails--sale of the material in its current form--is likely closed to the department. Obtaining legal authority from Congress to sell depleted uranium under USEC Privatization Act section 3112 or other legislation would provide the department with an additional option in determining the best course of action to obtain the maximum financial benefit from its tails. Our March 2008 report therefore suggested that Congress consider clarifying DOE's statutory authority to manage depleted uranium, under the USEC Privatization Act or other legislation, including explicit direction about whether and how DOE may sell or transfer the tails. Depending on the terms of such legislation, a sale of DOE's tails could reap significant benefits for the government because of the potentially large amount of revenue that could be obtained. In any event, enacting explicit provisions regarding DOE's disposition of depleted uranium would provide stakeholders with welcome legal clarity and help avoid litigation that could interrupt DOE's efforts to obtain maximum value for the tails. DOE's issuance of a comprehensive uranium management plan in December 2008 provided welcome clarity on the department's plans for marketing its uranium. Unfortunately, DOE has failed to follow-through with the actions laid out in its plan. By not following its plan to sell or re- enrich some its tails beginning in 2009, DOE has increased uncertainty in the uranium market about its ultimate plans for its depleted uranium tails. In addition, DOE continues to be unable to quickly react to changing market conditions to achieve the greatest possible value from its uranium inventories. Chairman Whitfield, Ranking Member Rush, and Members of the Subcommittee, this completes my prepared statement. I would be happy to respond to any questions you or other Members of the Subcommittee may have at this time. If you have any questions or need additional information, please contact Gene Aloise at (202) 512-3841 or aloisee@gao.gov. Contact points for our Offices of Congressional Relations and Public Affairs may be found on the last page of this statement. Major contributors to this statement were Ryan T. Coles (Assistant Director), Antoinette Capaccio, Karen Keegan, and Susan Sawtelle. This is a work of the U.S. government and is not subject to copyright protection in the United States. The published product may be reproduced and distributed in its entirety without further permission from GAO. However, because this work may contain copyrighted images or other material, permission from the copyright holder may be necessary if you wish to reproduce this material separately.

Summary:
Since the 1940s, the Department of Energy (DOE) has been processing natural uranium into enriched uranium, which has a higher concentration of the isotope uranium-235 that can be used in nuclear weapons or reactors. This has resulted in over 700,000 metric tons of leftover depleted uranium, also known as "tails," that have varying residual concentrations of uranium-235. The tails are stored at DOE's uranium enrichment plants in Portsmouth, Ohio and Paducah, Kentucky. Although the tails have historically been considered a waste product, increases in uranium prices may give DOE options to use some of the tails in ways that could provide revenue to the government. GAO's testimony is based on its March 2008 report (GAO-08-606R). GAO updated the analysis in its 2008 report to reflect current uranium prices and actions taken by DOE. The testimony focuses on (1) DOE's options for its tails and (2) the potential value of DOE's tails and factors that affect the value. DOE's potential options for its tails include selling the tails "as is," re-enriching the tails, or storing them indefinitely. DOE's current legal authority to sell its depleted uranium inventory "as is" is doubtful, but DOE generally has authority to carry out the other options. (1) DOE's authority to sell the tails in their current unprocessed form is doubtful. Because of specific statutory language in 1996 legislation governing DOE's disposition of its uranium, DOE's authority to sell the tails in unprocessed form is doubtful, and under the rules of statutory construction, DOE likely lacks such authority. However, if Congress were to provide the department with the needed authority, firms such as nuclear power utilities and enrichment companies may be interested in purchasing these tails and re-enriching them as a source of nuclear fuel. (2) DOE could contract to re-enrich the tails. Although DOE would have to pay for re-enrichment, it might obtain more value from selling the re-enriched uranium instead of the tails if its re-enrichment costs were less than the discount it would have to offer to sell the tails as is. (3) DOE could store the tails indefinitely. This option conforms to an existing DOE plan to convert tails into a more stable form for long term storage, but storing the tails indefinitely could prevent DOE from obtaining the potentially large revenue resulting from sales at current high uranium prices. DOE issued a comprehensive uranium management plan in December 2008 that stated that the department would consider selling depleted uranium or re-enriching it to realize best value for the government and that it would begin selling or re-enriching depleted uranium in 2009. However, to date, DOE has not sold or re-enriched any of its depleted uranium and, according to DOE officials, has no current plans to do so. The potential value of DOE's depleted uranium tails is currently substantial, but changing market conditions could greatly affect the tails' value over time. Based on May 2011 uranium prices and enrichment costs and assuming sufficient re-enrichment capacity is available, GAO estimates the value of DOE's tails at $4.2 billion--about $3.4 billion less than GAO's March 2008 estimate. However, this estimate is very sensitive to changing uranium prices, which have dropped since GAO's March 2008 report was issued. GAO's estimate is also very sensitive to the availability of enrichment capacity. In particular, DOE would have to find a company with excess enrichment capacity beyond its current operations, which may be difficult if large amounts of enrichment processing were required. In its 2008 report, GAO suggested that Congress consider clarifying DOE's statutory authority to manage its tails. No action on this recommendation has been taken to date. Also, GAO recommended that DOE complete a comprehensive uranium management assessment. DOE issued a uranium management plan in December 2008 that addressed GAO's recommendation.