[Reactor3 got worse than last year] 5 Sv/h on the first floor of reactor3, “3.6 times worse than last year”

On 11/27/2012, Tepco conducted robot survey on the first floor of reactor3 building. [Link]

The purpose was to investigate the pipe for contaminated air from the turbin building, the pipe is already damaged.

The result shows there was no additional damage on the pipe but the radiation level increased at 5 of 8 locations, the highest reading was 4.78 Sv/h, which increased from 1.3 Sv/h since 11/14/2011. 

It reaches the fatal dose within two hours.

It was 8mSv/h at the entrance of the building.

Tepco is now researching the cause of having increased the radiation level drastically since last year.

[Worse than last year in reactor3] 5 Sv/h on the first floor of reactor3, "3.6 times worse than last year"

 

[Worse than last year in reactor3] 5 Sv/h on the first floor of reactor3, "3.6 times worse than last year" 2

 

[Worse than last year in reactor3] 5 Sv/h on the first floor of reactor3, "3.6 times worse than last year" 3

 

Source 1 2

 

 

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Français :

[Le réacteur 3 est pire que l’an dernier] 5 Sv/h au premier étage : “3,6 fois pire que l’an dernier”

Le 27 novembre 2012, Tepco a conduit un robot d’exploration au premier étage du réacteur 3. [Lien]

Le but était d’examiner le tuyau de l’air contaminé qui vient du bâtiment de la turbine, tuyau déjà endommagé.

Les résultats montrent qu’il n’y a pas de nouveaux dégâts sur ce tuyau mais que le niveau de radioactivité a augmenté en 5 endroits sur 8, le pire relevé ayant été 4,78 Sv/h, alors qu’au 14 novembre 2011 on en était à 1,3 Sv/h .

On atteint la dose mortelle en moins de deux heures.

On avait 8 mSv/h à l’entrée du bâtiment.

Tepco recherche maintenant la cause de cette augmentation drastique du niveau de radioactivité depuis l’an dernier.

Réacteur 3 : 5 Sv/h au premier étage, c'est 3,6 fois pire que l'an dernier

Réacteur 3 : 5 Sv/h au premier étage, c'est 3,6 fois pire que l'an dernier 2

Réacteur 3 : 5 Sv/h au premier étage, c'est 3,6 fois pire que l'an dernier 3

Sources : 1 2

  1. either Tepco did a cruddy survey last year, which is very possible or they had the reactor flash and spit corium around.

    there have been reports of transients out of the reactor, i don’t expect Tepco to say that though.

  2. if measurements are fine, this could strenghten the possibility that radionuclides are coming up with the smokes and moisture and slowly building up and acumulating around the core reactors, such as inside the buildings and near the buildings or even more noticable outside and downwind the buildings..Slowly making work more and more impossible to do on the site. Or there is are stronger radiation emittions from the coriums due to some physical constraint changes. I don’t know if cooling water is related in any way, probably not unless something I don’t know. If this is a clear trend, such as a monthly increase, it sounds like this is likely not good at all. Maybe some data have been taken between now and then and can be used to confirm a trend or not. Anyway, with such a big increase, if data are taken again in 30 days, results will confirm/infirm a trend.

  3. There are 3 things that could effect the radiation readings. The source or mass of the radiation can change, the distance from the source can change, or the shielding between the source and detector can change.
    In this case the source could have changed because more of it could have melted down to the bottom of the pressure vessel, or even into the drywell basement. If this happened, which is probable, then the distance from the source also changed. The shielding could have changed if there was less water in the pressure vessel or in the drywell basement.
    These readings on the first floor of the reactor building, in an area that normally has very little dose,mean there will be no human ever working in the building. And these readings should continue to rise with time. The corium is still moving downward with gravity.

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About this site

This website updates the latest news about the Fukushima nuclear plant and also archives the past news from 2011. Because it's always updated and added live, articles, categories and the tags are not necessarily fitted in the latest format.
I am the writer of this website. About page remains in 2014. This is because my memory about 311 was clearer than now, 2023, and I think it can have a historical value. Now I'm living in Romania with 3 cats as an independent data scientist.
Actually, nothing has progressed in the plant since 2011. We still don't even know what is going on inside. They must keep cooling the crippled reactors by water, but additionally groundwater keeps flowing into the reactor buildings from the broken parts. This is why highly contaminated water is always produced more than it can circulate. Tepco is planning to officially discharge this water to the Pacific but Tritium is still remaining in it. They dilute this with seawater so that it is legally safe, but scientifically the same amount of radioactive tritium is contained. They say it is safe to discharge, but none of them have drunk it.

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