Providing expertise and tools to predict and map the spread of hazardous material accidentally or intentionally released into the atmosphere
NARAC Overview video
NARAC is a national support and resource center for emergency planning, real-time assessment, emergency response, and detailed studies of atmospheric releases of nuclear, radiological, chemical, biological, and hazardous natural materials. Located at the Department of Energy/National Nuclear Security Administration's (DOE/NNSA) Lawrence Livermore National Laboratory (LLNL), NARAC provides timely and accurate plume predictions to aid emergency preparedness and response efforts in protecting the public and the environment. Since 1979, NARAC has provided support for numerous accidents or potential incidents, and celebrated its 40th anniversary in 2019.
Web site that provides authorized users access to NARAC modeling tools and products through an easy-to-use interface
Web site for distribution of DOE/NNSA Emergency Response Consequence Management information and products to authorized users
Web site that provides International Atomic Energy Agency member states with access to 3-D model predictions of the consequences of airborne radiological releases from NARAC and other Global Dose Assessment Centers
PC-based atmospheric dispersion software package for rapid assessments of the downwind hazard from a radiological release
For analyzing atmospheric dispersion hazards from toxic chemicals, NARAC develops and maintains EPIcode on behalf of DOE, for use within the DOE/NNSA complex.
Estimating atmospheric sources from radionuclide detections
Monte Carlo design for Ru-106 source estimation—5,184 transport simulations and 6 uncertain source parameters
Bayesian analysis provides 6-dimensional posterior probability distribution function for Ru-106 source parameters
Bayesian analysis provides a maximum likelihood Ru-106 source location probability map
NARAC provided daily weather and plume forecasting to support mission planning and provide situational awareness for U.S. personnel deployed to Japan
DOE/NARAC provided predictions of possible arrival times and dose in U.S. Territories (particle animation shows the complexity of trans-Pacific dispersion)
Rapidly changing meteorological conditions presented a significant modeling challenge (particle animation shows changing meteorology over March 14-March 16 UTC)
NARAC conducted source estimation and model refinement based on available field data to predict the total external dose rate including the combined effects of airborne and ground contamination