Full-scale Testing of Technology for Repairing PCV Leakage Points
Full-scale Testing of Strengthening Technology for Suppression Chamber (S/C) Support Columns [IRID/Hitachi GE Nuclear Energy] (November 29, 2016)


IRID is engaged in ongoing development of technology for repairing leakage points in the Primary Containment Vessel (PCV) under a project sponsored by the Ministry of Economy, Trade and Industry (METI) for the FY2016-2017 period towards the decommissioning of the Fukushima Daiichi Nuclear Power Station.


As part of this project, IRID commenced testing using “a full-scale mock-up test device” to establish technology for repairing water leakage points in the lower part of the PCV.
The first workability verification test for strengthening Suppression Chamber (S/C) support columns was conducted in November 2016.

*This testing device simulates vent pipes, the S/C and torus room wall in the lower part of the Fukushima Daiichi Unit 2 PCV. The testing device is of a full-scale size, but represents a 1/8 portion of the circular S/C.

●Testing overview [Technology for strengthening S/C support columns]
R&D for water stoppage technology through injecting filing inside the S/C is being undertaken in order to retrieve fuel debris. The total weight of the S/C is expected to increase due to this injecting filling. IRID is therefore making efforts to develop technology for seismic strengthening of S/C support columns through injecting reinforcement materials in the lower part of the S/C.

●Full-scale tests to be performed
・Vent pipes water stoppage technology
・Repair technology to stop water leakage through injecting filling inside the S/C
・Strengthening technology for the S/C support columns

Workability verification and pouring (concrete) testing will be conducted for each technology.
A series of full-scale tests for development of construction methods are planned for completion by the end of the next fiscal year.

*We expect to provide updates on the status of these tests accordingly when the test schedule is confirmed.

[Attachment: Workability verification test for strengthening S/C support columns as a full-scale mock-up test]
http://irid.or.jp/wp-content/uploads/2016/12/20161201.pdf PDF

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Pouring device Lowering hose operation
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Operation to lower a hose while avoiding objects, viewing the front monitor 2. Operation to lower a hose while avoiding objects, viewing the front monitor: 3.
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Monitoring screen in remote operation room Mixer agitator pressure pump to inject reinforcement materials through a hose

Inquiries regarding this topic may be directed to IRID viaE-mail