Lawrence Livermore National Laboratory

Providing expertise and tools to predict and map the spread of hazardous material accidentally or intentionally released into the atmosphere

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.

NARAC Response to the Fukushima Dai-ichi nuclear power plant accident (2011)

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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.