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NARAC provides airborne hazards predictions of the consequences of radiological, nuclear, chemical, and biological releases. Under the DOE, NARAC “provides real-time computer predictions of the atmospheric transport of material from radioactive releases and of the downwind effects on health and safety” (National Response Framework, Nuclear / Radiological Incident Annex). NARAC supports the Interagency Modeling and Atmospheric Assessment Center (IMAAC) for nuclear/radiological events.

Emergency Contact Information

If you are involved in an emergency situation involving a major hazardous release to the atmosphere where lives are at risk and you believe you need Federal dispersion modeling assistance, you may notify one of the following and request NARAC support:

  • NARAC Operations at 925-424-6465, for emergencies only
  • Department of Energy (DOE) Watch Office 202-586-8100, for radiological incidents

Between 7:30 AM to 4:15 PM Pacific Time, Monday-Friday, calling NARAC Operations will put you in direct contact with one of our trained operations staff members who will ask you a short series of questions to determine the nature and severity of the incident. At other times, your call will be answered by LLNL’s Emergency Duty Officer, who will forward your request to our on-call staff when you request NARAC assistance. You will receive a call-back in about 10 minutes.

NARAC Services

NARAC provides subject matter experts and software tools to predict and map the consequences associated with significant atmospheric releases of nuclear, radiological, chemical, or biological material. Using a centralized atmospheric dispersion modeling system, NARAC can readily estimate the downwind effects from these sources and distribute products to you electronically through several mechanisms, including the NARAC Web. Users of NARAC Web have the ability to access and download consequence management products. Some NARAC Web users are also able to run simulations using the NARAC modeling system with the ability to share the results with other NARAC web users.

NARAC hosts the Department of Energy (DOE) National Nuclear Security Administration (NNSA) Office of Nuclear Incident Response (NA-84) Consequence Management Web site, CMweb.

NARAC Accounts

Authorized NARAC Web users may login above. If your organization is authorized to receive NARAC support and Web user accounts, please click on the “account request” link above to apply for an account. Please check with the management of your organization to determine if you are authorized to receive a NARAC account.


Contact NARAC Support at: NARAC Support or at (925) 422-9159

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