It is necessary to develop technology to dismantle, remove, recover, and carry out interfering obstacles remotely. In particular, it is important to ensure the feasibility of processing in narrow areas and the workability of remote operation. Therefore, it is necessary to establish a function to prevent contact with the surrounding environment during operation of a multi-degree-of-freedom robot.

In order to maintain the integrity of existing structures, it is necessary to prevent damage to the equipment and surrounding structures caused by cutting.

Compared to machining operations, other operations such as positioning the machining tool, grasping the object, and changing tools, require a great deal of time. In this respect, it is necessary to develop tools for supporting the operation of workers.

Decontamination is necessary when equipment is carried out from the work cell to control the release of radioactive materials, so that it is necessary to improve decontamination by taking measures to prevent contamination by foreign substances.

For remote work and monitoring, it is necessary to establish a method to construct work equipment, peripheral equipment, and monitoring equipment remotely including installing a camera in narrow areas remotely).

Dust diffusion control measures are important in the retrieval of interfering objects associated with the construction of access routes. It has been confirmed that safety measures have been fully considered in the current work procedures, such as monitoring dust concentrations while gradually expanding the work. On the other hand, it is also required that the work process is not significantly extended, and it is necessary to set appropriate work control values for dust concentration.

It is necessary to establish a basic database to respond to unexpected situations and contingencies by consolidating knowledge about on-site information and its uncertainties, as well as efforts to resolve them. In addition, by disclosing such collective knowledge, it is necessary to gain a bird’s eye view of the decommissioning progress in the related investigation issues, to optimize the decommissioning process as a whole, and to promote research efficiently.

In the future decommissioning work of the 1F, it is necessary to cut and remove many pipes, etc. However, it is often difficult to know what the conditions are like inside such pipes. For example, if the presence or absence of contents, presence or absence of liquid, radioactive material concentration, hydrogen concentration, etc. are not known, it is difficult to select appropriate cutting methods and measures (e.g., measures to prevent scattering of contents). In consideration of on-site application, it is desirable to be an easy-to-use method (short time understanding, handy type, etc.). In particular, it should be possible to determine the presence or absence of α-nuclides in the piping, and if α-nuclides are present, to what extent they are present.

Expanding confinement barriers in a high-dose environment is an extremely difficult task, and it is necessary that the work is carried out with a short rotation of heavily equipped workers. Given these circumstances, considering the imperfection and uncertainty of the confinement barriers, and the anticipated occurrence of earthquakes, etc., it is necessary to increase the safety and certainty of the work.

In the construction of access routes, it is necessary to minimize the amount of secondary waste (additional amount of waste generated) generated by processing.

In the side entry method, the confinement function of the connection structure between the new heavy structure and the PCV side opening, shielding, and response to seismic displacement are issues to be addressed.

In constructing the access route for the top entry method, it is necessary to investigate it considering the results of additional surveys, such as the situation and dose survey in the reactor well below the shield plug and the dose survey in the excavation hole.