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

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