On 2/20/2013, Tepco investigated inside of torus room of reactor1. [URL 1]
Torus room is where the facility called S/C (suppression chamber) is located. S/C is a part of the coolant system, fractured fuel debris maybe scattered in it, but the details are not known.
(cf, [Column] 3 facts to support the hypothesis that fractured nuclear fuel is in individual stages of nuclear reaction [URL 2])
Tepco inserted thermometer, camera, dosimeter etc from the hole drilled on the wall.
As a result, they found out the highest radiation level was 920 mSv/h, where was above the water surface.
The radiation level goes high toward the surface of water, but it also goes high as it goes close to S/C, which may suggest the fractured fuel debris is in S/C.
http://www.tepco.co.jp/nu/fukushima-np/handouts/2013/images/handouts_130220_03-j.pdf
Iori Mochizuki
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Français :
920 mSv/h au rez-de-chaussée du réacteur 1 : “Y a-t-il des débris de combustible dans la S/C ?”
Le 20 février 2013, Tepco explore l’intérieur de la salle du tore du réacteur 1. [Lien]
La salle du tore c’est l’endroit où se trouve l’équipement appelé S/C (chambre de surpression). La S/C fait partie du système de refroidissement, il peut y avoir dedans des débris de combustible cassé mais les détails ne sont pas connus.
Tepco y a introduit un thermomètre, une camera, un dosimètre, etc, par le trou foré dans le mur.
Ils ont ainsi constaté que le plus haut niveau de radioactivité était de 920 mSv/h, ce qui était au dessus de la surface de l’eau.
Le niveau de radioactivité augmente au fur et à mesure qu’on s’élève au-dessus de la surface de l’eau mais il augmente aussi quand on se rapproche de la S/C, ce qui peut laisser penser qu’il y a des débris de combustible cassé dans cette S/C.
Source : http://www.tepco.co.jp/nu/fukushima-np/handouts/2013/images/handouts_130220_03-j.pdf
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It is alright, according to TEPCO. Everything is fine in the world of TEPCO.
Since the drywell is suppose to be dry and now the suppression doughnut is half surrounded by water, it is a good thing the melted core is inside the doughnut weighting it down. Wouldn’t want to see three reactors and containment shells floating like buoys on their doughnuts out to sea after the next tsunami hits.
given Rac 1 melted out, it’s likely a fiar bit of corium flowed into the S/C.
I doubt that, the melted flow would hang at the bellows before flowing on down. Probably would melt out at the shell pass thrus. Besides, an exit through the support skirt is necessary either by following mechanical paths, burn through or both. Then by the time it built up high enough to enter s/c intakes pipes there are other routes to use as exits.
If any Unit melted around the s/c it was #2, it didn’t explode so the melt could stay together really heating things up.