MARITIMEAFFAIRS

Risk Assessment Fukushima

Marine Observation and Data Expert Group

DG MARE Iain Shepherd 12 October 2011

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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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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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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MARITIMEAFFAIRSSimulations by Japan, Mercator, Sirocco

MERCATORsurf. current

NCOMsurf. current

No fishing in Fukushima

No bottom trawling in Ibaraki

•Sample– 20% from all of Japan

– 10% from affected prefectures

– 694 samples

– Only contamination in green tea

• 216 samples• No contamination above 10 Bq/kg

Date (mm/dd/yy)

• 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