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What has the NWS done so far (prior to the current Review Cycle)?

What is the NWS doing on this action in the current Review Cycle?

Sources

What has the NWS done so far (prior to the current Review Cycle)?

French operators (CEA, Framatome) are part of the Heracles EU-funded consortium to develop alternative technologies to highly-enriched uranium. The consortium developed in particular H2020 project such as the Heracles-CP (development on sound scientific understanding of the irradiation behaviour of UMo and advancing production techniques for dispersion fuel) from 2015 to 2019, LEU FOREvER (advancing production technology for dispersion and monolithic fuels and paving the way for high density U3Si2 fuels) from 2017 to 2021 and the EU-Qualify (research on medical isotopes) from 2020 to 2026.

Framatome has started cooperation with the Technical University of Munich in 2019 for the conversion of the FRM II reactor to low enriched uranium.

What is the NWS doing on this action in the current Review Cycle?

French operators (CEA, Framatome, Institut Max Von Laue, Institut Polytechnique de Grenoble) have completed the EU-funded project EU-Qualify from 2020 to 2026. In 2024, the US NNSA and Kyoto University (Japan) announced that the French company Framatome CERCA had taken part in converting the Kyoto University Critical Assembly’s “Core C” to use HALEU fuel instead of highly enriched uranium.

During the current Review Cycle, the conversion of the FRM II reactor in Germany has moved forward with the support of the EU-CONVERSION programme (adopted in February 2025) and the cooperation of Framatome, Institut Laue-Langevin, the CEA and the Université Grenoble Alpes.

Sources

Converting the Kyoto University Critical Assembly’s “Core C” to use HALEU fuel marks over a decade of U.S.-Japan collaboration, NNSA, 19 November 2024, https://www.energy.gov/nnsa/articles/nnsa-converts-its-110th-research-reactor-following-decade-long-effort-japan

Website of the Heracles Consortium, https://heracles-consortium.eu/horizon2020.php

Supplying the European Research Reactors with Safe Low-Enriched Uranium Fuels for Their Conversion and Long-Term Operation to Secure the Supply of Medical Radioisotopes, CORDIS, 2024, https://cordis.europa.eu/project/id/101163752/fr

What has the NWS done so far (prior to the current Review Cycle)?

What is the NWS doing on this action in the current Review Cycle?

Sources

United Kingdom

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What has the NWS done so far (prior to the current Review Cycle)?

What is the NWS doing on this action in the current Review Cycle?

Sources

United States

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What has the NWS done so far (prior to the current Review Cycle)?

In 1978, the Department of Energy established the Reduced Enrichment for Research and Test Reactors (RERTR) program to help minimize civilian use of highly enriched uranium. The U.S. Government’s Global Threat Reduction Initiative and subsequent 2016 reorganization into the NNSA’s Office of Material Management and Minimization continued these efforts. Since 1978, at least 109 research reactors and medical isotope facilities worldwide were either converted to LEU or confirmed shutdown.

Prior to the current Review Cycle, the NNSA also achieved success in helping Mo-99 production facilities in converting to high-assay low-enriched uranium (HALEU) and supports the establishment of domestic supplies of Mo-99 without the use of proliferation-sensitive HEU. The NNSA’s progress on this issue prompted a joint certification in 2021 by the Secretaries of Energy and Health and Human Services that there was now enough worldwide supply of the medical isotope molybdenum-99 made without using HEU to meet the needs of patients in the United States, thus triggering a congressionally mandated ban on exports of HEU for foreign medical isotope production.

What is the NWS doing on this action in the current Review Cycle?

During the current Review Cycle, the NNSA’s Office of Material Management and Minimization developed, designed, and tested a new LEU fuel (uranium-molybdenum monolithic) that as of 2026 was in the final stages of fuel demonstrations before applying for regulatory approval for use. In addition to this new first of a kind monolithic fuel, M3 has partnered with the European HERACLES consortium of reactors and fuel manufacturers to develop, design, test, and qualify new high-density LEU fuels including a new uranium-molybdenum dispersion fuel, as well as a higher-density uranium-silicide dispersion fuel. These new LEU fuels will be used to convert research reactors in the United States and abroad.

In addition, in 2023, the NNSA’s Mo-99 Program achieved a major milestone when it helped Belgium’s National Institute of Radioelements convert their medical isotope production facility from HEU to LEU; as a result, all major global molybdenum-99 (Mo-99) production facilities now use LEU targets.

Sources

U.S. Department of Energy. “RERTR-2024 International Meeting.” October 27-31, 2024. https://rertr.nse.anl.gov/international-meetings/2024-meeting/.

U.S. Department of Energy. “Qualification of New LEU Fuels for Research Reactors.” April 23, 2026. https://www.energy.gov/nnsa/qualification-new-leu-fuels-research-reactors.

U.S. Department of Energy. “U.S. Secretaries of Energy and Health and Human Services Jointly Certify Sufficient Worldwide Supply of Critical Medical Isotope.” December 20, 2021. https://www.energy.gov/articles/us-secretaries-energy-and-health-and-human-services-jointly-certify-sufficient-worldwide.

U.S. Department of Energy. “NNSA helps global health industry achieve major nuclear nonproliferation milestone.” March 28, 2023. https://www.energy.gov/nnsa/articles/nnsa-helps-global-health-industry-achieve-major-nuclear-nonproliferation-milestone.