Several updates :
From french public agencies, IRSN and ASN
:
IRSN today 8am CET (12 hours ago) in french :
http://www.irsn.fr/FR/Actualites_pr...Seisme-Japon_Point-situation-28032011-08h.pdf
ASN (public agency for nuclear safety) : today 10 30 am :
in french
http://www.asn.fr/
IRSN and ASN confirm that the water comes from the reactors. Confirming a breach in the tank and the shell or a leak from some pipes that go from the reactors to other parts of the plant. That could be either reactor 2 or 3, or both.
They base this on the highly radioactive water (1000 mSv/hour for reactor 2, 750 mSv/hour for reactor 3) + the levels of pressure measured within the reactors. In case of an emergency , the maximum dose Japan allows for nuclear workers in case of a nuclear accident is 250 mSv/year. This maximum dose was re evaluated for the Fukushima workers, it was lower before the accident.
ASN is saying that based on the info they have , they can not confirm the integrity of the shell of reactor 1
the "good" news : the pools and the reactors are now cooled with fresh water, sea water is not used any more. The temperature in the pools seems under control. Irsn is still worried about a possible leak in pool of reactor 3.
ASN : the environment is likely to be contaminated in areas further from the plant than originally thought. French government will check 100% of the food imported from Japan, airlines have been requested to check radioactivity on all the goods imported from Japan (ASN expects very low radioactivity if any, in goods other than food).
From the news :
Plutonium has been found in 5 different places in the plant. There is not much plutonium, but the fact that there is some is disturbing.
Some of the radioactive water is probably going to the Pacific .
Tepco is trying to pump the water from the machine rooms, and it is likely they will throw this water into the ocean, because no one knows what to do with it.
Japan has officially called several french companies for help (maybe they called other countries, the news here only mention the french companies) : Areva, EDF (both French Tepco), and the CEA (commissariat à l'énergie atomique) = public agency in charge of developping nuclear use for public or commercial use.
Personal note : calling CEA for help is calling people who are doing
research about nuclear things.
Areva and EDF had offered help before, they were turned down, although Areva's CEO confirmed 2 weeks ago that there were contacts between Tepco technicians and Areva technicians. At the time she said that in spite of these contacts, Areva didn't have a clear idea of the situation.
Now Areva is sending robots to Fukushima. I remember hearing Areva's CEO saying that these robots had been suggested 2 weeks ago, but not "needed" at the time.
Comment from an expert : this situation is unprecedented , it is not 3 miles island (the melt down had been contained within the shell) , and too different from Chernobyl. Chernobyl was one explosion, now we're probably talking of massive leaks into the ocean, leaks into the atmosphere, and if the melted fuel goes through the shell and concrete, massive contamination into the ground.