Nuclear accident in Japan, a Japanese Chernobyl?

[Christophe]

Continuation on the world live: http://www.lemonde.fr/asie-pacifique/ar ... id=1491461

01h

Tepco has announced that the radiation level around the Japanese Fukushima-Daiichi nuclear power plant has quadrupled after the new explosion in reactor no. 2. The radiation measured at 08:31 local time (00:31 in France) was 8 microsieverts per hour against 217 measured forty minutes earlier, said Tepco.

According to Japanese authorities, below one million microsieverts per hour, the level of radiation does not constitute a health hazard.

??
1 million microSv per h = 1 Sievert per h right? It's just HUGE since it is shown below ...

Thanks to Vanilys who provides us with details on the Sieverts: This unit is the dose equivalent, that is to say the energy received per unit of mass of radioactive radiation, taking into account the relative dangerousness of the latter. We consider today that radioactivity has a direct effect on the organism from 50 millisievert per year. For info (we are talking about milliSievert, mSv here): Average annual dose received in France: ~ 2,4 mSv / year / person. A chest x-ray: 0,3 mSv. Smoking a cigarette: 0,001 mSv. Authorized limit for the exposure of the population to artificial radiation, in France: 1 mSv / year / person. Authorized limit for exposed personnel, in France: 20 mSv over twelve rolling months per person. More details on the Sievert: http://fr.wikipedia.org/wiki/Sievert For Chernobyl, the approximately 600 "liquidators" who had worked on the site received an average dose of around 000 mSv (from 100 to 10 mSv). In the rest of Europe, the passage of "radioactive clouds" led to a detectable increase in radioactivity, but the population was exposed to less than 10 mSv (i.e. two or three times the dose. average received by natural radioactivity). More details on Chernobyl: http://fr.wikipedia.org/wiki/Catastrophe_de_Tchernobyl

So at 8 mSv per hour, just staying 2 hours on site to take 16 mSv is more than the dose most received by the liquidators?

Am I wrong or else?

[dedeleco]

It is even 8000 microsieverts / h, about 25000 = 3xNb h per year times the natural radioactivity !!
On 20minutes.fr
The maximum limit that suffered over a life of 100 years is 100000 and a few Sieverts we died in excruciating pain in the following month !!
At a million microsieverts or 1 sievert we tan with radiation and we are good for the hospital for months, no need for a dosimeter !!
There are Japanese people who say deadly c ... and who show that they are out of touch with reality !!
So do not stay for days in this high radioactivity !!

We are approaching Chernobyl, at level 6 of 7 !!

Since they do not control, will it get worse ???

Save that can in the opposite direction of the wind at more than 100Km !!

The liquidators had a theoretical dose much lower than the real around several 0,1 Sieverts !! !!

[Alain G]

Christophe

I repeat what they said to CNN that I get on TV, difficult to give another source!

Latest news:

All personnel are evacuated from the plant except the cooling team!

Serious radioactive leak according to CNN!

Fire in reactor # 4!

Significant increase in radioactivity around the plant!

Risk of merger raised to its maximum!

It's not going well!

[Christophe]

We are approaching Chernobyl, at level 6 of 7 !!

If the 3 reactors explode I think we will have to invent a level 8 !!!

The liquidators had a theoretical dose much lower than the real around several 0,1 Sieverts !! !!

This is what is effectively noted above (and in wiki a priori, not verified)

[Christophe]

News of what happened last night ...

March 15, 2011, which risks going down in history ...

There was a fire in Reactor Building 4 which was stopped and completely secure according to all ...

A) http://www.leparisien.fr/tsunami-pacifi ... 359815.php

Besson still as c ...:

7:55. Eric Besson on RTL. According to the Minister of Industry, Japan is "on the road to disaster.

4:36. The fire on the fourth floor of reactor 4 of the Fukushima nuclear power plant number 1 is "apparently extinguished" according to the Jiji news agency.

0:30. An explosion took place shortly after 6 a.m. local time (22 p.m. in Paris) at reactor 2 of the Fukushima 1 nuclear power plant, the government announced. It would be due to hydrogen, according to BFMTV citing Japanese nuclear safety. The government has clarified that the explosion damaged the condensation pool of the containment designed to prevent radioactive leaks in the event of an accident. This is the first time that damage has been reported for the containment vessel of a reactor at the Fukushima 1 power station (...)

Uh what is the condensation plant, the famous Tore?

B) http://www.lefigaro.fr/international/20 ... ushima.php

Unlike previous explosions on reactors 1 and 3, that of reactor 2 was not visible from the outside and did not damage the external building. Another explosion of hydrogen then started a fire in reactor 4, which was shut down for maintenance when the earthquake occurred. A used nuclear fuel storage tank was hit by flames, according to the International Atomic Energy Agency. According to the IAEA, the dose rate has reached up to 400 millisieverts per hour on the site itself.

If there is H2 in the BR4 is it good that there is also an overheating problem with the 4 right?

0.4 Sv is 400 microsieverts per hour, it is now almost a Chernobyl equivalent, right?

[the middle]

Many people do not seem to know how to leave Fukushima.
That worries me. (More roads, more trains)
By sea, there is no way to evacuate?
I hope that if such a problem exists, the competent authorities will seek rapid solutions.
Pcq telling people to seal their house is not a solution.
Harr, I forgot, it is the power stations that are essential, not the men.
And then you have to pretend that everything is under control.

[Christophe]

Very just right, but a priori they have already managed to evacuate within a radius of 30 km around the power plant ... I have just read that more than 600 people had been displaced.

30 km radius is also the "dead" zone around the Tcherno / Prypiat power plant ...

What worries me even more is the weather: north wind + rain for today apparently just after the enormous increase in leaks ... in short, we risk radioactive rain on 35 million inhabitants ... difficult to do "worst".

There is nothing worse than rain in the event of an atmosphere polluted by radioelements ...

Live World News: http://www.lemonde.fr/asie-pacifique/ar ... id=1491461

08h

Kyodo News reports remarks by Hiroshima survivors who ask Tepco to take responsibility, noting that they believe the operator of the Fukushima plant understates the risks.
http://english.kyodonews.jp/news/2011/03/78160.html

08h

The Japanese government has claimed to have detected, at Fukushima Dai-Ichi, 30 millisieverts between reactor 2 and reactor 3, 400 millisieverts near reactor 3, and 100 near number 4.

For information, from a dose of 100 millisieverts received by the human body, medical observations show an increase in the number of cancers. A person who has received a dose of one sievert (1 millisieverts) or more is considered to have "radiation sickness" and should be hospitalized. The generally accepted exposure for the general public is one millisievert per year.

This is what the pool is !!! It was the storage of used fuel (see fears of Hervé Morin yesterday interview / chat on the world, link above):

07h

A spent nuclear fuel storage tank is on fire at reactor 4 at the Fukushima-Daiichi plant, and radioactivity has been released into the atmosphere, the IAEA, citing the Japanese authorities, said on Tuesday. According to the IAEA, the dose rate has reached up to 400 millisieverts per hour on the site itself.

Tokyo Electric Power (Tepco), the operator of this plant, asked the Japanese defense forces (Japanese army) and the United States for help in extinguishing the fire, which broke out after a explosion at reactor number 4. This explosion could have been caused by hydrogen, according to the IAEA.

The French Embassy reassures:

The French Embassy in Japan denies that a radioactive cloud is heading towards the Tokyo region. "Provisional information gathered early in the morning was not confirmed and it was immediately removed from the embassy site," a spokesperson told AFP.

"The weather forecast indicates that the tide is turning: Tokyo is not threatened by radioactive fallout," said an embassy statement. "Beyond a radius of 30 km from the plant, the observed radioactivity is not at a level requiring specific measures to protect the population," said the embassy.

It advises its nationals to follow the instructions of the Japanese authorities: "Apart from a radius of 30 km around the plant, that is to say in particular in Tokyo, the situation does not require protection particularly for the day". "As a preventive measure, we advise you to stock up on water and food and to be ready for any caulking of your home," the statement concludes.
[The embassy site difficult to access].

[Christophe]

It's not possible, the 5 and 6 are starting to mess around !!!

08h

A slight increase in temperature was measured in reactors 5 and 6 the Fukushima Daiichi nuclear power plant damaged by Friday's earthquake, government spokesman said on Tuesday.

[the middle]

It's like an accident on the ice, we see ourselves slide, and we have time to tell ourselves that the crash is coming soon.

[Christophe]

Well, I no longer understand anything that is announced:

09h
The level of radioactivity has dropped at the Fukushima plant, according to Japanese officials.

09h
Radioactivity at the plant, which had risen sharply following two explosions a few hours ago, was at 7:30 a.m. French time, almost 700 times lower than the level initially announced, declared the secretary general of the government, Yukio Edano. According to him, the dose rate recorded on the site was 596,4 millisieverts per hour - a unit of measurement of the dose of radioactivity received by humans.

What is this gibberish ???