The decontamination work in reactor buildings at the Fukushima Daiichi Nuclear Power Station (NPS) must be accelerated as early as possible because radiation doses there are currently high and therefor workers are not able to put in long hours.
IRID plans to use a miniature robot to investigate (‘A2 Investigation’) the inside of the Fukushima Daiichi Unit 2 primary containment vessel (PCV). This investigation will see the robot make its way the point directly below the reactor pressure vessel and making full use of an onboard camera, in addition to other devices, measure radiation and temperature levels and have it collect vital data for the consideration of various decommissioning scenarios.
A survey of the interior of Unit 1 at the Fukushima Daiichi Nuclear Power Station (NPS) using the ‘muon transmission method’ began on February 12, 2015.
In order for the decommissioning of the damaged reactors at the Fukushima Daiichi NPS to proceed, molten fuel debris inside the reactors must first be retrieved. However, radiation levels are extremely high, preventing workers from entering the reactor building and directly observing the condition and location of the fuel in the cores.
Work on the construction of measuring equipment in preparation for testing of muon technology is currently underway. It is hoped that this technology will allow experts to obtain a view inside the reactors at the Fukushima Daiichi Nuclear Power Station (NPS).
IRID conducted a preparatory test for designing a measuring system using “muon transmission method” at Fukushima Daiichi Nuclear Power Station (NPS) and reports the result herein.
The Japan Atomic Energy Agency (JAEA) evaluated the potential hazards pertaining to the storage of waste zeolite and sludge that were used to treat contaminated water. The JAEA concluded that there exists a very low risk of hydrogen fire or hydrogen cyanide poisoning due to the radiolysis reactions occurring in the storage areas.
The investigation and repair of primary containment vessel (PCV) leak locations are indispensable for water filling according to the fuel debris retrieval plan in the “Mid- and-Long-Term Roadmap” and for preventing contaminated water levels from increasing.
The progress status of the R&D project for the “inspection/repair of leaking locations using PCV lower-section repair technology” in the subsidy project of the Japanese Ministry of Economy, Trade and Industry (METI) is as follows:
The Japan Atomic Energy Agency (JAEA), a member of IRID, conducted a project of radiochemical analysis of standing trees at TEPCO’s Fukushima Daiichi Nuclear Power Station (NPS). This analysis was part of a study to collect and evaluate basic data needed to examine methods to process and dispose of radioactive waste generated at the site. The JAEA led this R&D project with partially funding from the Japanese Ministry of Economy, Trade and Industry (METI).
Hitachi-GE Nuclear Energy Ltd. (a member of IRID) and Hitachi Ltd. announced the development of two types of transformer robots that can modify their posture or shape in water or in narrow spaces surrounded by obstacles. These robots will advance to demonstration testing for IRID’s R&D projects, which has following main aims, namely “Inspection of leaking locations of the PCV” and “Investigating the inside of reactor containment vessels. This project is partially funded by the Japanese Ministry of Economy, Trade and Industry (METI).
The “MHI-MEISTeR”, a remotely controlled robot developed by Mitsubishi Heavy Industries, Ltd. (MHI) funded by the Japanese Ministry of Economy, Trade and Industry (METI) has completed demonstration testing, and performed decontamination work and concrete core sampling tasks at the Fukushima Daiichi Nuclear Power Station (NPS).