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MARITIMEAFFAIRS
Risk Assessment Fukushima
Marine Observation and Data Expert Group
DG MARE Iain Shepherd 12 October 2011
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Tsunami 11 March 2011
• Killed 20,000 people
• Destroyed– 25,000 fishing boats– 300 fishing ports – The livelihoods of 70,000 people
and then came a nuclear accident
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3Slide
MARITIMEAFFAIRS
Sampling
Main sampling location
1. Front of NPP site (By TEPCO)
2. Near(~20km) site (By TEPCO)
3. About 30 km from site (By JAMSTEC)
4. Neighbor prefecture (by MERI)
5. (~150km north and south from NPP)
6. Deep sea (by JAMSTEC & FRA)
3
a)
b)
d)
c)
e)
( C ) JAMSTEC
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4Slide
MARITIMEAFFAIRS
Release• Radionuclides were
released into the ocean both directly and by atmospheric deposition..
• iodine 131 no longer of radiological significance,
• no agreement as to the total caesium 137 and 134 released.
– The Japanese Atomic Energy Agency estimated 16 petabequerels (PBq) of
– French IRSN estimated 52PBq of 137Cs alone.
– The JAEA estimated a release of about 36 Pbq of each caesium isotope into the atmosphere
• Roughly 10% of what was released during 1960s bomb tests
1E+12
1E+13
1E+14
1E+15
1E+16
1E+17
08/04/11 22/04/11 06/05/11 20/05/11 03/06/11 17/06/11 01/07/11 15/07/11
137
Cs a
ctivit
y (Bq
)
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5Slide
MARITIMEAFFAIRSSimulations by Japan, Mercator, Sirocco
MERCATORsurf. current
NCOMsurf. current
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No fishing in Fukushima
No bottom trawling in Ibaraki
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•Sample– 20% from all of Japan
– 10% from affected prefectures
– 694 samples
– Only contamination in green tea
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• 216 samples• No contamination above 10 Bq/kg
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Date (mm/dd/yy)
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• Onlyu check migratory pelagic fish caught inside zone 61
• Only check albacore, bluefin, skipjack, swordfish and yellowfin.
• Keep watch on Japanese monitoring of these species sampled inside the Fukushima prefecture
conclusion