Official / primary / company-controlled:
https://www.centrusenergy.com/news/centrus-and-radiant-announce-long-term-partnership-for-domestic-haleu-to-supply-kaleidos-microreactors/
https://www.prnewswire.com/news-releases/centrus-and-radiant-announce-long-term-partnership-for-domestic-haleu-to-supply-kaleidos-microreactors-302873669.html
https://www.energy.gov/ne/haleu-availability-program
https://www.federalregister.gov/documents/2026/07/27/2026-15130/radiant-nuclear-llc-radiants-special-nuclear-material-license-license-application

Trade / reporting context:
https://www.nucnet.org/news/centrus-signs-haleu-supply-contract-for-radiant-microreactors-9-3-2026
https://www.neimagazine.com/news/centrus-radiant-sign-haleu-deal/

Duplicate check:
Local articles already cover DOE conditional HALEU allocation to NASA/Radiant (July 28) and Standard Nuclear TRISO/Radiant (Sept. 3). This source card is distinct: a September 2026 definitive multi-year Centrus-Radiant HALEU supply contract with prepayments and before-end-of-decade delivery language.