Four U.S. Nuclear Reactors Achieve Criticality, Marking Major Milestone

Four nuclear reactors in the United States have recently reached criticality. Achieving criticality indicates the reactors are sustaining a controlled chain reaction. The milestone is a crucial phase before full commercial power generation begins. These reactors are part of the country’s effort to expand clean energy capacity. Their success follows years of design, construction, and regulatory review. Industry analysts view the achievement as a boost for nuclear renaissance plans. Operators will now proceed with further testing and grid integration trials. Observers will watch for licensing approvals and potential impact on energy markets.