Energy Department says advanced nuclear reactor first to reach critical milestone

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The Energy Department announced that an advanced nuclear reactor has achieved criticality, a self-sustaining chain reaction that marks a major technical milestone in nuclear power development. The achievement represents progress in next-generation reactor technology, which proponents argue could provide cleaner, safer energy alternatives. The milestone reflects ongoing investments in advanced nuclear designs as the U.S. seeks to expand its energy portfolio and reduce carbon emissions. Details about the reactor's location, operator, and timeline for commercial deployment were not immediately specified in the announcement.