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Madelyn Creedon visits NNSS U1a underground complex

NNSA BlogThis week, NNSA Principal Deputy Administrator Madelyn Creedon visited the Nevada National Security Site (NNSS). She discussed experiments that take place in the U1a complex. U1a is a complex 963 feet below the surface which is used for dynamic experiments with special nuclear material and other weapon materials.

Kristen Crawford, from Defense Experimentation and Stockpile Stewardship (DESS)/NSTec, described to Creedon how data from an experiment on detonators will be used in an upcoming subcritical experiment. After the detonation, probes track the movement of the surface of the detonator and show data on the screens. The data from the images is mathematically extracted to provide the velocity of the detonator surface as it moves. Los Alamos National Laboratory scientists take this data and use it to better understand surface velocities in dynamic experiments and to improve the conditional codes that help assure the safety and reliability of the nuclear stockpile without nuclear weapons testing.

In the photo, from left to right are Raffi Papazian, Director of DESS/NSTec, Kristen Crawford, Marylesa Howard, DESS/NSTec; and Madelyn Creedon.