The “Mid-and-Long-Term Decommissioning Action Plan 2023” released by TEPCO on March 30, 2023, does not indicate a specific period for dismantling PCV/RPV/buildings, and it is not proceeded the investigation of the dismantling methods and procedures, nor the estimation of the amount of waste to be generated during dismantling.

On the other hand, for the purpose of internal investigation in the PCV/RPV for fuel debris removal and environmental improvement in fuel debris removal work, implementation studies of radiation source investigation and decontamination in the building and related R&D activities are being conducted in parallel with these activities. In particular, the remote removal or decontamination of highly contaminated pipes is considered important for the fuel debris removal from Unit 2, where the radiation dose in the reactor building is higher than in Units 1 and 3.

In addition, for the purpose of utilization in the safety assessment of fuel debris removal, data are being collected on the dispersion and migration behavior of dust generated by machining and cutting of fuel debris in dry and wet environments.