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Small and Medium-scale Nuclear Accident Consequence Assessment and Decision Support System

Small and Medium-scale Nuclear Accident Consequence Assessment and Decision Support System

Integrating regional meteorological data with small and medium-scale migration simulation and consequence evaluation of radioactive contaminants, the system predicts and evaluates the consequences of radioactive substances released or likely to be released into the environment in the event of an accident at a nuclear facility. It is capable of giving suggestions on protective measures, and providing decision-makers with intuitive consequence assessment information and results in chart. The system can be applied to assist in the implementation of emergency action plans and schemes for off-site personnel, as well as to emergency drills. It can also provide guidance on deployment plans for emergency monitoring.

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  • Function of Assessment
  1. Response range: The radius of evaluation can be set as50k and 10km around the release point (with resolutions of 1km and 200m);
  2. The simulation time forconsequence assessmentis variable, as long as it’s within the allowable range of available meteorological data (including measured and predicted data). The system is able to judge and give priority to using real-time meteorological data
  3. Conduct consequence calculationsandassessment based on different meteorological data and source term characteristics to give responses in different situations.
  • Data acquisition

Basic data such as source terms, meteorological data, and environmental monitoring data can be collected through various methods including automatic acquisition through linking with professional software, external import, manual input, adopting basic database, and using historical data.

  • Design of assessment model chain :

The system is configured with multiple model chains to meet different user needs. In terms of diffusion model, the system is provided with the random-walk particle model independently developed based on Monte Carlo simulation, and Lagrangian puff model;

In terms of dose model, the system can provide expected dose, avertable dose, and residual dose;

As for dose calculation for evacuation routes, the system is able to evaluate evacuation routes in real-time based on preset routes or real-time routes decided by users;

For dynamic food chain and dosage, the system can provide the radionuclide intake rates for human in various age groups (including infants, young children, adolescents, youth, and adults);

In terms of recommendations for protective actions, intervention levels can be flexibly set according to national standards.

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