The necessity and importance of unstable structures of the Shelter object dismantling after the commissioning of the New Safe Confinement (NSC) was justified. The scope and sequence of dismantling works are determined, technological schemes of radioactive waste management, which will be formed during the process of dismantling, are proposed. It is foreseen to create the necessary infrastructure within the NSC for dismantling, as well as to expand and modernize the existing radioactive waste management infrastructure at the ChNPP site to ensure the disposal of all types of radioactive waste, in particular for high-level waste management. To illustrate conceptual solutions for the dismantling of unstable structures of the Shelter object, a computer simulation of such activity was performed. For computer modelling, the system of automated design and 3D graphics and animation were used, as well as the software complex of the HVRC VRdose Planner that was developed by the Institute for Energy Technologies (Norway). The use of such a modelling will be extremely useful at the stage of working design for the dismantling of unstable structures of the Shelter object, which will allow, based on the results of simulation and a comprehensive analysis of alternative scenarios for dismantling, to choose the best scenario for safe execution of works. It is noted that after the implementation of the planned measures for the dismantling of unstable structures of the Shelter object, the problem of the reliability of its structures will be solved only partially, since the planned dismantling activity mainly concerns only the structures that form the outer shell of this object. The problem of reliability of a significant number of internal structures of the destroyed 4th power unit, including the design of premises, in which fuel-containing materials are concentrated remains unresolved. The greatest damage/destruction experienced constructions of the 4th power unit located above the floor level of the central hall. It is practically impossible to perform the stabilization of these structures (extremely hazardous radiation conditions), therefore it is more acceptable to dismantle them using the system of main NSC cranes and remotely controlled units. Such activity must be carried out within the next 30 - 50 years.
Keywords: Shelter object, unstable structures, dismantling, radioactive waste, modelling.
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