400 kg of debris dropped onto 2 fuel assemblies in Reactor 3 pool / State of fuel unverified yet – Photos

Following up this article..

 

Tepco dropped a major piece of debris into Spent Fuel Pool of Reactor 3 [URL]

 

A major piece of debris was dropped into SFP3 while they were removing debris from the pool, according to Tepco.

 

The dropped debris was the operation desk of the refueling machine.

Around 12:45 of 8/29/2014 (JST), Tepco attempted to grab the operation desk by an unmanned crane, but they dropped it to the middle eastern side of the pool.

The ambient dose near the pool remains 3.2 mSv/h, which is not changed after the accident, Tepco announced.

 

At this moment, Tepco is investigating the state of the pool.

 

From Tepco’s follow-up report, the dropped debris weighs 400kg. It fell onto 2 fuel assemblies. 566 fuel assemblies are stocked in SFP 3.

In order to analyze the radioactive density of the pool water, they stopped the pool’s coolant system for 2 hours, which increased the temperature from 28.4℃ to 35.5℃. Tepco doesn’t report anything about the state of pool, but this means the pool temperature didn’t take longer than 2 hours to increase by 7℃. It would reach the safety limit of 65℃ only within 9 hours without coolant system.

 

Cs-134/137 density of the pool water was 1,020,000,000,000 Bq/m3. It sounds extremely high but Tepco states it is not showing any significant change.

 

 

↓ Photo in the pool taken by an underwater camera

400 kg of debris dropped onto 2 fuel assemblies in Reactor 3 pool : State of fuel unverified yet - Photos

 

 

 

↓ Before the crane drops the debris

5 400 kg of debris dropped onto 2 fuel assemblies in Reactor 3 pool - State of fuel unverified yet - Photos

 

 

↓ Dropping the debris

3 400 kg of debris dropped onto 2 fuel assemblies in Reactor 3 pool : State of fuel unverified yet - Photos

 

 

↓ Dropped the debris

4 400 kg of debris dropped onto 2 fuel assemblies in Reactor 3 pool : State of fuel unverified yet - Photos

 

http://photo.tepco.co.jp/date/2014/201408-j/140829-01j.html

http://www.tepco.co.jp/nu/fukushima-np/handouts/2014/images/handouts_140829_05-j.pdf

http://www.tepco.co.jp/cc/press/2014/1241158_5851.html

 

 

You read this now because we’ve been surviving until today.

_____

Français :

400 kg de gravas sur 2 assemblages de la piscine du réacteur 3 / leur état n’est pas encore contrôlé – Photos

 

Article lié : Tepco fait tomber un gravas énorme dans la piscine des combustibles du réacteur 3

Selon Tepco, un énorme gravas est tombé dans la SFP3 alors qu’ils en retiraient de la piscine.
Le morceau tombé est le pupitre de contrôle des opérations de la machine de rechargement en combustibles.
Le 29 août 2014 vers 12:45 (JST), Tepco a tenté de saisir le pupitre de contrôle des opérations avec une grue mais ils l’ont laissé tomber au milieu du côté Est de la piscine.
Tepco a déclaré que la dose ambiante auprès de la piscine reste à 3,2 mSv/h, inchangée depuis l’accident.
Pour l’instant, Tepco fait un état des lieux de la piscine.

Selon le rapport de suivi de Tepco, le gravas tombé pèse 400 kg. Il est tombé sur 2 assemblages de combustible. 566 assemblages de combustible sont stockés dans la SFP3.
Pour pouvoir analyser la radioactivité de l’eau de la piscine, ils ont arrêté son système de refroidissement pendant 2 heures, ce qui a fait monter la température de 28,4℃ à 35,5℃. Tepco ne dit mot sur l’état de la piscine mais il n’a ps fallu plus de 2 heures pour qu’elle augmente de 7 ℃. Sans système de refroidissement, la limite de sécurité de 65 ℃ serait ainsi atteinte en seulement 9 heures.

La radioactivité en Cs-134/137 de l’eau de la piscine est de 1 020 000 000 000 (1020 milliards) Bq/m³. Ça a l’air extrêmement élevé mais Tepco affirme qu’il n’y a pas eu de changement significatif.

↓ Photo de l’intérieur de la piscine via appareil photo sous-marin

400 kg of debris dropped onto 2 fuel assemblies in Reactor 3 pool : State of fuel unverified yet - Photos

↓ Avant que la grue ne fasse tomber ses gravas
5 400 kg of debris dropped onto 2 fuel assemblies in Reactor 3 pool - State of fuel unverified yet - Photos

↓ La chûte
3 400 kg of debris dropped onto 2 fuel assemblies in Reactor 3 pool : State of fuel unverified yet - Photos

↓ Après
4 400 kg of debris dropped onto 2 fuel assemblies in Reactor 3 pool : State of fuel unverified yet - Photos

http://photo.tepco.co.jp/date/2014/201408-j/140829-01j.html
http://www.tepco.co.jp/nu/fukushima-np/handouts/2014/images/handouts_140829_05-j.pdf
http://www.tepco.co.jp/cc/press/2014/1241158_5851.html

Vous pouvez lire ceci parce que nous avons survécu jusqu’à aujourd’hui.

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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