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Full-scale Test for Repair Technology for Leakage Points inside the Primary Containment Vessel: Reinforcement of Suppression Chamber Support Columns [IRID / Hitachi GE Nuclear Energy] (July 31, 2017)

Jul.31,2017

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.

Full-scale testing of PCV Leakage Point Repairing Technology : Full-scale testing of Water Stoppage Technology by Filling in Suppression Chamber (S/C) [IRID / TOSHIBA] (June 24, 2017)

Jun.24,2017

IRID is engaged in the ongoing development of technology for repairing leakage points in Primary Containment Vessels (PCVs), under a project sponsored by the Ministry of Economy, Trade and Industry (METI) for the FY 2016–2017 period, aimed at the decommissioning of the Fukushima Daiichi Nuclear Power Station (NPS). As part of this project, IRID conducted tests to stop water leakage in the suppression chamber (S/C) by injecting concrete.

Development of technology for criticality control in fuel debris retrieval: Development of “critical approach monitoring method” using Kyoto University Critical Assembly (KUCA) (June 21, 2017)

Jun.21,2017

It is confirmed through the monitoring system that fuel debris is not currently in a critical state. Since the shape of fuel debris and water level may change during fuel debris retrieval in the future, the possibility of criticality configuration is considered to be very small. However, we are promoting development of sub-criticality monitoring technology and criticality prevention technology to ensure prevention of criticality, and also safely terminate criticality, even if it occurs.