The secondary waste generated from contaminated water treatment are stored in adsorption towers, etc. and it is not easy to sample the contents due to the high dose, so it is necessary to understand and evaluate the properties.

Storage may be continued for a certain period of time until processing and disposal. Therefore, especially it is necessary to evaluate the long-term integrity of the storage containers, considering the influence of component, which may affect on long term integrity, even its amount is trace. In addition, it is necessary to evaluate not only the degradation caused by radiation but also the aging properties of the waste materials themselves. Then, it is important to identify the issues that may occur and investigate a countermeasure as necessary.

The secondary waste generated from contaminated water treatmen is likely to be stored in the adsorption tower while it contains water. It is necessary to determine the chemical effects of water-containing wastes.

It is important to formulate a medium- to long-term analysis strategy that defines the target wastes and their priority, analysis objectives and quantitative targets, etc., and to analyze and evaluate them based on the strategy.

Since the target nuclides, analytical items, precision, the number of analytical samples, etc. required differ depending on the target waste, it is necessary to establish a system based on the appropriate division of roles according to the characteristics of the facility and the purpose of analysis.

For fuel retrieved from the SFP, it is necessary to efficiently and reliably confirm the presence of and the extent of damage to it.

It is necessary to clarify the factors that affect the long-term storing, understand the properties of the fuel retrieved from the SFP, and evaluate whether or not the long-term integrity can be ensured.

The plan is to transfer the fuel in the pools of all units to the common pool by the end of 2031. After that, in consideration of tsunami risk, studies are underway for dry storage on higher ground, including existing fuel in the common pool. TEPCO has announced that in addition to the existing metal casks as dry storage facilities, it will study the application of concrete casks with canisters, which have been proven overseas. Regardless of which dry storage facility is selected, it is necessary to consider reasonable storage measures in consideration of the integrity of the damaged fuel.

The characteristics of the wastes generated from dismantling of the PCV/RPV/building are very large in volume and wide in range from high to low contamination, and may contain alpha-nuclides and so on. Taking these factors into consideration, it is necessary to have technologies for understanding the properties of the waste more quickly, easily, reliably, and at a lower cost.

The above technologies include one that can conduct on-site characterization of the wastes before dismantling. If on-site characterization becomes possible, it will be possible to feed back the results for the dismantling method and waste classification.

In addition, it is necessary to assume the quantity and properties of waste that is expected to be generated before dismantling.

There are many different types of wastes, and even if they are of the same type (e.g., rubble), their individual inventories vary. Even for a single type of waste, the inventory varies depending on the location (surface vs. interior) and shape (pores vs. smooth areas). Under these circumstances, it is not practical to measure the inventory of all wastes, so it is necessary to conduct sampling measurements and then evaluate the overall inventory. Therefore, it is required to have a technology that enables quick, easy, reliable, low-cost, and highly accurate evaluation.

In order to realize an approach that efficiently ensures the necessary accuracy, which is important for low-dose wastes, it is required to proceed with efficient analysis through simplification and expediting, and establish an efficient analytical planning method incorporating the DQO process (a method developed by the U.S. Environmental Protection Agency to plan sampling of analytical samples for decision making) with statistical methods.

As for high-dose wastes, it is required to continue efforts to collect and analyze samples from cesium adsorption vessels, which are currently being conducted, and to efficiently obtain data on actual samples using an analytical planning methods that combine the DQO process and statistical methods, as well as to investigate the priority of data to be collected for improving the accuracy of the migration model.