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Operation of communication about the “scorpion” robot which will be sent to the confinement enclosure of reactor n ° 2

TEPCO and its partners launched a communication operation about the “scorpion” robot, which will be sent to the containment reactor of reactor n ° 2 in an attempt to locate the corium, ie the highly radioactive molten fuel, mixed with debris. It is not certain that the mission will be a success, the cleaning robot having lasted only two hours in this enclosure because of the extreme radiations, without being able to finish its task.

A press release announces what we already know and insists on the challenges: “every step is a new challenge for TEPCO, but TEPCo welcomes the challenges”. The company would be almost happy with the accident? It is accompanied by a promotional video with a comparison to the kendô fights posted on its Facebook page.

http://www.tepco.co.jp/en/press/corp-com/release/2017/1377951_10469.html

https://www.facebook.com/OfficialTEPCOen/videos/1346869308705698/

The Japanese nuclear industry wants to place itself on the decommissioning market and highlights the technologies being developed. This robot was designed by IRID, Toshiba and TEPCO. IRID benefits from public funds. As for Toshiba, it is almost bankrupt because of its nuclear branch and TEPCO is financially in a bad shape.

The press release and the video do not provide any relevant information and are in complete discrepancy with reality.

1. Current conditions of Unit 2 Primary Containment Vessel (PCV)

Nuclear fuel in the Primary Containment vessel (PCV) was exposed to the air and melted from the impact of March 2011 Great Earthquake.

As a result of the accident analysis, it was found that a portion of melted nuclear fuel might have been fallen inside the pedestal.

To remove fuel debris, it is necessary to investigate the PCV and clarify the conditions of debris and surrounding structures.

15-feb-2017-reactor-2-a

 

2. Outline of Unit 2 PCV investigation

[Purpose]: To obtain feedback information (deformation of platform, etc.) for the design and

development of next investigation devices inside the pedestal

To inspect conditions on the platform inside pedestal, fuel debris fallen to the CRD housing, and conditions of structures inside pedestal.

[Investigation point]: Platform and Control Rod Drive (CRD) will be investigated from the platform inside pedestal

15-feb-2017-reactor-2-b

3. Work steps for Unit 2 PCV investigation

15-feb-2017-reactor-2-c

 

4. Preparatory investigation results from X-6 penetration to CRD rail

 

15 feb 2017 reactor 2 d.jpg

4. Preparatory investigation results at the entrance of pedestal area

15-feb-2017-reactor-2-e

 

 

4. Preparatory investigation results of pedestal area

15 feb 2017 reactor 2 f.jpg

 

5. Additional results expected from the self-propelled investigation device

15-feb-2017-reactor-2-g

 

6. Investigation by the self-propelled investigation device to the end of CRD rail

15-feb-2017-reactor-2-h

 

6. Investigation by the self-propelled investigation device to the end of CRD rail

15-feb-2017-reactor-2-i

 

Reference: Investigation results on the platform inside the pedestal

15 feb 2017 reactor 2 j.jpg

Technical information for the media is available here:

In Japanese about the upcoming mission http://www.tepco.co.jp/nu/fukushima-np/handouts/2017/images1/handouts_170215_08-j.pdf

And in English http://www.tepco.co.jp/en/nu/fukushima-np/handouts/2017/images/handouts_170215_01-e.pdf

And about radiation protection measures http://www.tepco.co.jp/nu/fukushima-np/handouts/2017/images1/handouts_170215_09-j.pdf

And in English http://www.tepco.co.jp/en/nu/fukushima-np/handouts/2017/images/handouts_170215_02-e.pdf

Translated from L’ACROnique de Fukushima http://fukushima.eu.org/operation-de-communication-sur-le-robot-scorpion-qui-va-etre-envoye-dans-lenceinte-de-confinement-du-reacteur-n2/

 

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February 17, 2017 - Posted by | Fukushima 2017 | , , , ,

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