30 March 2011 Fukushima Nuclear Power Plant's Potential Impact on the Marine Environment - IAEA Environmental Lab Assessment

Marine Environment - Fukushima NPPs Potential Impact on the Marine Environment – Assessment of IAEA Environmental Laboratories on Data provided by Japan IAEA-Environmental Laboratories, Monaco

Seawater sampling off Fukushima (26 March 2011) carried out by Japanese Authorities
Seawater sampling locations of Japanese Authorities
Transect about 30 km offshore, sample locations separated by 10 kilometres
Levels of dose rates were also measured as indicated

Temporal trend on concentrations Data submitted by Japanese authorities Cs-137

Temporal trend on concentrations Data submitted by Japanese authorities I-131

Monitoring of the Marine environment
Comparison of Cs-137 seawater concentration with historical data
30 km offshore surface water concentrations are 3 to 4 orders of magnitude higher than the values measured in 2005
330 m East of Fukushima Dai-ichi concentrations are up to 3 orders of magnitude higher than the values measured offshore
1 10 3 10 4 10 5 10 6 10 2 10 1 10 7 10 8 April 2005 30 km Bq.m -3 [1 – 10 1 ] 1 10 3 10 4 10 5 10 6 10 2 10 1 10 7 10 8 24, 25 March 2011 Bq.m -3 [10 3 – 10 4 ] [10 5 – 10 7 ]

Cs-137 Bq.m -3 Monitoring of the Marine environment seawater concentration
30 km :
28 march, Concentrations increase at station 5
Spatial distribution is more heterogeneous
20 km :
New station since 28 of march #9
300 m :
Concentrations increase 2 orders of magnitude since 28 March
TEPCO MEXT 28 march, depth 132 m : Cs -137 not detected

Temporal trends of concentration in seawater 330 m east of Discharge point Units 1 to 4

Temporal trends of concentrations in seawater at Units 5/6

Modelling Dispersion of an arbitrary initial discharge Courtesy to the Group SIROCCO of the Observatoire Midi-Pyrenées of the University of Toulouse, CNRS Animations to be seen at: http://sirocco.omp.obs-mip.fr/outils/Symphonie/Produits/Japan/SymphoniePreviJapan.htm

Modelling Dispersion of an arbitrary initial discharge

Modelling Modelling of the deposition on the sea surface and subsequent concentration

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30 March 2011 Fukushima Nuclear Power Plant's Potential Impact on the Marine Environment - IAEA Environmental Lab Assessment

by International Atomic Energy Agency

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