Fukushima - Background Information on Operational Intervention Levels (1 April 2011)

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Fukushima - Background Information on Operational Intervention Levels (1 April 2011)

  1. 1. Operational Intervention Levels: background information and example April 1, 2011
  2. 2. What is the Operational Intervention Level – OIL? <ul><ul><li>Operational Intervention Level (OIL): </li></ul></ul><ul><ul><li>A type of action level used immediately and directly (without further assessment) to determine appropriate protective actions based on environmental measurements </li></ul></ul>
  3. 3. Why OILs are important? <ul><li>OILs are used as a practical tool for prompt decisions based on available data </li></ul><ul><li>We cannot use “generic criteria” as they are not directly measurable and cannot be used to make prompt decisions during an emergency </li></ul><ul><ul><ul><li>100 mSv in first 7 days then take urgent protective actions e.g. evacuation, sheltering </li></ul></ul></ul>
  4. 4. How is OIL for evacuation calculated? <ul><li>Based on generic criteria – GC (dose) </li></ul><ul><li>Default values should be calculated in advance for different emergency scenarios and different types of measurements </li></ul><ul><ul><li>dose rate measurements (µSv/h), ground deposition measurements (Bq/m2), radionuclide concentrations in water, milk, food (Bq/kg), etc. </li></ul></ul><ul><li>Calculated assuming those most sensitive: infants, pregnant women, fetus—live normally in contaminated area for 7 days </li></ul><ul><ul><li>Exposure from deposition on ground </li></ul></ul><ul><ul><li>Inhalation of re-suspended radioactive material </li></ul></ul><ul><ul><li>Inadvertent ingestion of deposited radioactive material </li></ul></ul>
  5. 5. Under what conditions? <ul><li>Release of important fission products from reactor </li></ul><ul><li>Normal activities and no protective action taken for 7 days in the area of release (including children playing outside) </li></ul><ul><li>Radioactive decay and reduction in time due to weathering </li></ul><ul><li>Maximum dose factors used for representative individual (fetus) </li></ul>

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