TEPCO's storage management plan calls for the storage of secondary water treatment waste in the building, with priority given to the adsorption tower that contains large amounts of radioactive waste.

For the secondary waste generated from contaminated water treatment, a large waste storage facility is under construction as a storage facility for adsorption towers and the like. In addition, the ALPS slurry generated from the multi-nuclide removal system, etc., which has high water content rate and is fluid, will be stabilized (dehydrated) (a treatment facility to be installed in FY2026), and the sludge from the decontamination system will be transferred to a storage facility on higher ground (collection to be started in FY2025).

Considering the radiation effects of the slurry, the transfer of slurry from the HIC, whose integrity cannot be confirmed in the event of a fall, is being conducted with the aim of completing the transfer before the start of operation of the slurry stabilization treatment facility.

At the Radioactive Material Analysis and Research Facility Laboratory1, efforts are being made to use analytical methods to obtain data easily and quickly as a standard analytical method.

In order to obtain analytical data on high-dose waste, on-site demonstration of a technology for collecting adsorbent material from cesium adsorption vessel is being conducted.

As a countermeasure against hydrogen generation during storage of high-dose waste, factors(hydrogen embrittlement, radiation degradation, etc.) affecting filter degradation (blockage, damage, etc.) and methods to confirm these factors have been investigated.

In terms of treatment, the feasibility of applying low-temperature treatment technology to actual equipment has been confirmed through full-scale tests. In addition, methods for testing solidification feasibility and evaluating the stability (leaching characteristics, long-term alteration phenomena, radiation effects, etc.) of solidified products produced by various treatment technologies are being studied. In addition, regarding the expansion of the scope of application and intermediate treatment technologies such as pyrolysis treatment, confirmation has begun regarding its applicability to detoxification of organic substances and inactivation of reactive and corrosive substances.

Regarding disposal, in order to build measures to address the needs of the disposal concept, necessary information and knowledge is being collected on wastes for which waste streams are under consideration. A survey on wastes for which waste streams are under consideration and the construction of a storyboard of the progress of key events at disposal facilities have been initiated.

As part of the Unit 1 PCV interior investigation, measurements and evaluations are underway, including a detailed visual inspection outside the pedestal, a sediment thickness measurement, a sediment debris detection and evaluation (neutron flux level, etc.), and sediment 3D mapping measurement. The sediments have been successfully sampled and will be analyzed in the future. In March 2023, an underwater ROV successfully entered into the pedestal for the first time, and much information was obtained on the state of concrete loss at the bottom of the pedestal, sediments and fallen objects at the bottom of the pedestal, and upper structures such as the control rod drive mechanism housing.