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StocksMedium•7 April 2026•

1 min read

Antares Secures Historic US Approval for First Microreactor Safety Analysis

Key Facts

1Antares' Mark-0 reactor received the first-ever US Department of Energy approval for a Documented Safety Analysis (DSA) under the new DOE-STD-1271 standard.

2The DoE approval is considered equivalent to a Nuclear Regulatory Commission (NRC) license.

3BWXT is completing TRISO fuel fabrication for the pilot, with a planned criticality date before July 4th.

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Antares Nuclear has achieved a landmark regulatory milestone as the US Department of Energy (DoE) approved the safety analysis for its Mark-0 microreactor. This represents the first-ever approval under the new DOE-STD-1271 standard, effectively serving as a license for the project to move forward. The approval is a critical step toward commercialization, positioning Antares to provide carbon-free power for remote areas and military bases. Partner company BWXT is currently finalizing the TRISO fuel fabrication, with the reactor expected to reach criticality before July 4th. This development is seen as a major catalyst for the advanced nuclear sector, validating the commercial path for microreactors and reducing bureaucratic hurdles. Analysts expect this breakthrough to boost sentiment for nuclear-related stocks like OKLO and CCJ, as well as the URA exchange-traded fund.