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Text Content

Menu
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 * Event Timeline
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 * Contacting NARAC and Tours

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 * Briefing Products Open submenu
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 * Supplementary Products

Close submenuBriefing Products
 * Radiological Dispersal Device (RDD)
 * Nuclear Detonation
 * Nuclear Power Plant Accident
 * Hazardous Chemical
 * Biological Agent

Close submenuTechnical Products
 * Unknown Material
 * Toxic Industrial Chemical
 * Chemical Warfare Agent
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 * Nuclear Power Plant Accident
 * Blast Damage

Close submenuTools
 * Operational Modeling Open submenu
 * Mission Planning Tool
 * Web Tools
 * HotSpot and EPIcode
 * Software Quality Assurance

Close submenuOperational Modeling
 * System Architecture
 * Grid Generator
 * Meteorological Data Assimilation Model (ADAPT)
 * Weather Research and Forecasting Model (WRF)
 * Dispersion Model (LODI)
 * Geographical Data
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 * Specialized Models
 * Source Models
 * Model Testing and Evaluation
 * Model Refinement Using Measurement Data

Close submenuResearch and Development
 * Numerical Weather Prediction Modeling
 * Radar-Derived Wind Data
 * Physical Process Model Improvements
 * Radiological Dispersion Device (RDD) Modeling
 * Nuclear Fallout Modeling
 * Urban Field Studies
 * Urban Dispersion Modeling
 * Dense Gas Transport in Complex Environments
 * Indoor Exposures
 * Source Term Estimation (Inverse Modeling)
 * Cluster Computing

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NARAC


PRIMARY MENU

 * About
   * History
   * Expert Services
   * NARAC Facility
   * Sponsors
   * Event Timeline
   * Publications
   * Contacting NARAC and Tours
 * Products
   * Briefing Products
     * Radiological Dispersal Device (RDD)
     * Nuclear Detonation
     * Nuclear Power Plant Accident
     * Hazardous Chemical
     * Biological Agent
   * Technical Products
     * Unknown Material
     * Toxic Industrial Chemical
     * Chemical Warfare Agent
     * Biological Agent
     * Radiological Dispersal Device
     * Nuclear Detonation
     * Nuclear Power Plant Accident
     * Blast Damage
   * Supplementary Products
 * Tools
   * Operational Modeling
     * System Architecture
     * Grid Generator
     * Meteorological Data Assimilation Model (ADAPT)
     * Weather Research and Forecasting Model (WRF)
     * Dispersion Model (LODI)
     * Geographical Data
     * Meteorological Data
     * Hazardous Material Property and Exposure Data
     * Specialized Models
     * Source Models
     * Model Testing and Evaluation
     * Model Refinement Using Measurement Data
   * Mission Planning Tool
   * Web Tools
   * HotSpot and EPIcode
   * Software Quality Assurance
 * Research and Development
   * Numerical Weather Prediction Modeling
   * Radar-Derived Wind Data
   * Physical Process Model Improvements
   * Radiological Dispersion Device (RDD) Modeling
   * Nuclear Fallout Modeling
   * Urban Field Studies
   * Urban Dispersion Modeling
   * Dense Gas Transport in Complex Environments
   * Indoor Exposures
   * Source Term Estimation (Inverse Modeling)
   * Cluster Computing

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> 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. Since 1979, NARAC
has provided support for numerous accidents or potential incidents,
and celebrated its 40th anniversary in 2019.



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NARAC Web

CMweb

IXP

HotSpot

EPIcode

 

×


NARAC WEB

Web site that provides authorized users access to NARAC modeling tools and
products through an easy-to-use interface

Close
×


CMWEB

Web site for distribution of DOE/NNSA Emergency Response Consequence Management
information and products to authorized users

Close
×


IXP

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

Close
×


HOTSPOT

PC-based atmospheric dispersion software package for rapid assessments of the
downwind hazard from a radiological release

Close
×


EPICODE

For analyzing atmospheric dispersion hazards from toxic chemicals, NARAC
develops and maintains EPIcode on behalf of DOE, for use within the DOE/NNSA
complex.

Close

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RUTHENIUM DETECTIONS ACROSS EUROPE (2017)

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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

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NARAC ASSESSMENTS OF THE PLUTONIUM FINISHING PLANT (PFP) AT THE HANFORD SITE
NEAR RICHLAND, WASHINGTON (2017)

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NARAC RESPONSE TO THE FUKUSHIMA DAI-ICHI NUCLEAR POWER PLANT ACCIDENT (2011)

 1. 
 2. 
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 4. 

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

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