US advanced reactor company Deployable Energy announced that it has received approval of its preliminary documented safety analysis (PDSA) for its Unity microreactor criticality test, marking a critical milestone in the US Department of Energy (DOE) safety authorisation process and enabling the company to proceed towards reactor demonstration.

The approved PDSA establishes the preliminary safety basis for the Unity reactor criticality test, documenting how the design meets DOE requirements for hazard analysis, accident mitigation, and operational controls.

Completed in just 106 days, the review reflects “extensive engineering and safety evaluation and provides the formal foundation required to advance toward reactor startup and operations”, Washington-based Deployable Energy said.