ORNL is a leader in developing state-of-the-art radiation transport modeling and simulation tools and in applying these tools to solve challenging problems in national and global nuclear security. Recent developments in high-performance, high-fidelity, deterministic Monte Carlo, and hybrid Monte Carlo/deterministic radiation transport codes within flexible software frameworks have enabled solutions to challenging problems for the Department of Energy's National Nuclear Security Administration, Defense Threat Reduction Agency, and the Department of Homeland Security/Domestic Nuclear Detection Office portfolios. This includes integration of the ADVANTG/Denovo hybrid transport capability with the SWORD code to provide faster-running, high-fidelity 3D radiation transport capabilities for DTRA operational modeling applications, and refining and using the hybrid transport capability to analyze a wide range of neutron and gamma detection scenarios for NA-22. Expertise in developing and applying transport methods is being used to conceive, develop and deploy a new generation of computational tools for solving inverse transport and optimization problems for the NA-42 missions.
ORNL is a leader and has recognized expertise in national technical nuclear forensics, including nuclear weapon effects physics and fallout modeling and simulation. ORNL maintains the DELFIC and INDEPTH codes that are unique modeling and simulation tools for nuclear fallout and for prediction of plutonium production from reactor operations, respectively. The leadership relies on retention of staff expertise in modeling and analysis of particulate matter and material dispersion or detonation, as well as expertise in the chemistry and physics of fallout formation. ORNL also has extensive expertise in modeling and simulation of nuclear safeguards systems and the analysis of active and passive nondestructive assay systems. ORNL receives support from a variety of offices within the NNSA, the DHS/DNDO, DTRA, and the Department of State and has successfully grown the funding for this research over the past seven years. In addition to the funded research programs, ORNL is a member on the Nuclear Forensics Science Panel of the DHS/DNDO.
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