Why It Matters

The National Nuclear Security Administration (NNSA) has failed to report long-term uranium enrichment costs to Congress as required by law, according to a Government Accountability Office (GAO) report released last Thursday, August 20, 2026. The report, titled "Nuclear Fuel: Actions Needed to Enhance Cost Reporting and Economic Analysis for Federal Uranium Supply Efforts," found that the NNSA is pursuing three long-term enrichment efforts with an estimated cost of $140 billion through 2105, a figure that has never been formally reported to Congress in the biennial Enriched Uranium Management Plan as mandated.

The Department of Energy (DOE) has already committed $900 million to expand low-enriched uranium (LEU) enrichment capacity and $1.8 billion to build high-assay low-enriched uranium (HALEU) capacity. A ban on LEU imports from Russia could affect the availability of enriched uranium, and the U.S. does not currently have a fully domestic enrichment capability. Meanwhile, demand estimates for HALEU vary, and the estimated supply may not meet near-term demands.

The Big Picture

Enriched uranium serves two distinct purposes in American policy. The NNSA provides enriched uranium for national security missions, including tritium production for nuclear weapons and fuel for naval reactors. The DOE supports uranium enrichment for commercial nuclear power plants, medical isotope production, and research reactors.

Current law and policy restrict the government from using imported uranium or uranium enriched through foreign technology to meet national security needs. This legal constraint means the U.S. must develop and maintain fully domestic enrichment capabilities; a costly and technically complex undertaking that the country does not currently possess in complete form.

The NNSA maintains sufficient inventory of both low-enriched uranium and highly enriched uranium (HEU) to meet national security needs until the 2040s. On the civilian side, estimates from the DOE and other analysts about LEU supply and demand are generally well established, but the Russian import ban introduces significant uncertainty into future availability.

The GAO identified five recommendations to address these shortcomings. The NNSA Administrator should ensure that current long-term cost estimates for the Defense Fuels program are reported to Congress in future biennial Enriched Uranium Management Plans as required, and should update the Defense Fuels program's management documentation to align with Program Execution Instruction requirements. The Secretary of Energy faces three additional directives: ensure that anticipated economic analyses conducted to support DOE's uranium efforts are consistent with best practices and executive branch guidance, finalize the required report to Congress on HALEU availability, and ensure that programmatic documents developed to guide DOE's LEU and HALEU support efforts align with agency-specific guidance and best practices.

The Bottom Line

All five GAO recommendations remain open, with actions to satisfy their intent not yet taken or still being planned. The lack of transparent cost reporting and rigorous economic analysis leaves Congress and the public without a clear accounting of the true price of maintaining America's nuclear arsenal and civilian nuclear infrastructure. Until the NNSA and DOE implement these recommendations, the federal government will continue to operate a patchwork of uranium enrichment spending with no clear strategic justification or documented return on investment.

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