Marine Environment Monitoring
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Assessment of IAEA Environment Laboratories on Data provided by Japan

Assessment of IAEA Environment Laboratories on Data provided by Japan

Update 7 April

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Marine Environment Monitoring Presentation Transcript

  • 1. Marine Environment Monitoring
    Assessment of IAEA Environment Laboratories on Data provided by Japan
    Update 7 April
    IAEA Environment Laboratories, Monaco
  • 2. General comments
    • The contamination of the marine environment has occurred both through atmospheric fallout or washout with precipitation, and through discharges of contaminated water into the sea
    • 3. Authorised discharge of low level contaminated water (4 April)
    • 4. Japanese institutes continue to perform measurements in seawater at 30 m and 330 m off the discharge points of Dai-ichi NPP, as well at 10 km and 20 km off-shore and along two North-South transects situated 15 and 30 km off-shore
  • Seawater sampling offshore Fukushima carried out by Japanese Authorities
    Seawater sampling locations of Japanese Authorities
    • Transect about 30 km offshore, sampling points separated by 10 kilometres, surface and bottom seawater sampled
    • 5. Additional sampling stations at 10 and 20 km offshore, for which both surface and bottom seawater are sampled (M9-M10)
    • 6. New transect 15 km offshore
    • 7. Mainly surface water was collected and analysed, but meanwhile also some analyses for deep water samples were carried out
    Map 1
  • 8. Concentrations in sea water near discharge point of Unit 1-4
  • 9. Concentrations in sea water near discharge point of
    Unit 5 and 6
  • 10. I-131 concentration in sea water
  • 11. Cs-137 concentration in sea water
  • 12. Conclusions
    • The highest levels are still measured close to the coast, namely 30 m, 330 m and 10 km near-shore.
    • 13. Concentration data from about 30 km off-shore show a generally decreasing time trend
    • 14. It can be expected that, if no additional releases occur, the levels measured at the stations 30 km off-shore will continue to decrease significantly by dilution into deeper layers and dispersion by ocean currents
  • Conclusions
    The number of marine sampling points has been increased with a new North-South transect 15 km offshore
    One marine expert from IAEA Environmental Laboratories, Monaco has been in Japan to review and advise on marine sampling and measurements (back yesterday night) .