The “Mid-and-Long-Term Decommissioning Action Plan 2025” released by TEPCO on March 27, 2025, does not indicate a specific period for dismantling PCV/RPV/buildings, and it shows limited studies on what methods and procedures will be used to dismantle the buildings, and limited estimates on the amount of waste generated during building dismantlement (TEPCO estimates that the fuel debris removal preparation work will generate approximately 300,000 m³ of waste generated by dismantling of the buildings around Units 1 to 4 including resin and other waste generated before the earthquake). It is indicated in the 16th Sub-Committee for the Evaluation of Fuel Debris Retrieval Methods that considering the need to reduce risks associated with spent resins and sludge, the waste processing buildings for Units 1 to 4 should be dismantled and removed.

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.

Solid waste is classified and managed based on surface dose rates, while management based on radioactivity concentration has not yet been implemented.