IRID is engaged in the 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) between FY2016 and 2017 for the decommissioning of the Fukushima Daiichi Nuclear Power Station (NPS). As part of this project, IRID conducted testing of technology for the reinforcement of suppression chamber (S/C) by injecting mortar.
● Testing Overview [Technology for reinforcement of S/C support columns] R&D is being conducted for water stoppage technology by injecting filling inside the S/C, in order to retrieve fuel debris. The total weight of the S/C is expected to increase due to this injected filling; therefore, IRID is committed to R&D for seismic strengthening of S/C support columns by injecting reinforcement materials in the lower part of the S/C.
[Reference] Full-scale testing activities
・Vent pipes water stoppage technology: Workability verification test (completed), injecting test (completed)
・Repair technology to stop water leakage by injecting filling inside S/C
・Technology for reinforcement of S/C support columns: Workability verification test (completed), injecting test (now completed)
A workability verification test and concrete injecting test will be conducted for each technology. A series of full-scale tests for the development of construction methods is slated for completion by the end of FY2017.
*We expect to provide updates on the tests once the test schedule is confirmed.
＜Attachment: Overview of full-scale test for water leakage points inside the PCV＞
＜Attachment: Full-scale test for reinforcement of S/C support columns by concrete injection＞
|Injecting device (a circular shaped device left behind)||Drain pump|
|Monitoring screen (displaying water and reinforcement material surfaces)||Remotely operated monitoring|
|Producing mortar materials (adjacent to the full-scale testing facility)||Mixer / agitator pressure pump|
|Confirming a flow property of mortar materials|
Inquiries regarding this topic may be directed to IRID viaE-mail