U1a Complex

Some of the most sophisticated experiments in the stockpile stewardship program are conducted in an environmentally safe manner, nearly 1000 feet below the ground at the site. The U1a complex a sprawling underground laboratory and tunnel complex is home to a number of unique capabilities. Experiments in U1a range from measuring the properties of plutonium under weapons like conditions to state of the art diagnostic development and x-ray radiography. The complex hosts subcritical experiments, to collect data from plutonium when it is subjected to high pressures and shocks, mimicking conditions in a nuclear explosion. These experiments are essential to the National weapons laboratory’s mission to maintain the safety security and reliability of the nation’s nuclear weapon stockpile. Special technologies such as the Cignus machine enable scientists to use some of the most highly advanced radiographic technology in the world. All experiments are conducted below the criticality threshold, hence the label subcritical, and are consistent with the US nuclear testing moratorium. Conducting the experiments underground adds an extra element of safety and security.
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