Containment Repair Research for Fukushima Unit 2 Ongoing

IRID_u2_concrete_inj_diagram_2016.jpg

 

IRID announced the details of the ongoing research for repairing the unit 2 suppression chamber.

Based on their previous investigations IRID has determined that there could be a hole or series of holes of around 50mm in the unit 2 suppression chamber.

The research work is to determine if filling with concrete that structure could work. The proposed plan would use a concrete pump truck with a 5 inch diameter flexible hose to inject concrete into the suppression chamber.

Initial work took place at the Ando Hazama Technical Research Institute (Tsukuba City, Ibaraki Prefecture) on October 15th.

It seems they succeeded in layering the concrete mixture,  sinking properly in the bottom of the suppression chamber tube. A 28 day pressure test will be conducted to assure the concrete properly plugs the leak.

Future work may be conducted at the new decommissioning research center at Naraha.

Source IRID :

http://irid.or.jp/topics/%e5%8e%9f%e5%ad%90%e7%82%89%e6%a0%bc%e7%b4%8d%e5%ae%b9%e5%99%a8%e6%bc%8f%e3%81%88%e3%81%84%e7%ae%87%e6%89%80%e3%81%ae%e8%a3%9c%e4%bf%ae%e6%8a%80%e8%a1%93%e3%81%ae%e9%96%8b%e7%99%ba%e3%80%80%e3%82%b5/

<添付資料11/1スケールS/C試験に関する現場状況・概要図>
http://irid.or.jp/wp-content/uploads/2016/10/20161018_001.pdf
<添付資料2:コンクリート打設進捗に伴う時経列事象・解説図>
http://irid.or.jp/wp-content/uploads/2016/10/20161018_002.pdf

 

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