Energy Department hits July 4 goal as third small modular reactor reaches criticality

The Energy Department reported a milestone in its small‑reactor program. A third advanced nuclear reactor achieved criticality this week. The achievement fulfills the Trump administration’s July 4 deadline. The reactor’s success came under the department’s dedicated program for advanced reactors. Reaching criticality marks the point at which the reactor sustains a nuclear chain reaction. Officials say the milestone validates the policy push for small modular reactors. The next phase will involve testing, licensing and potential commercial deployment. Stakeholders will watch how the program moves from proof of concept to broader use.