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Information × Registration Number 0224U002226, 0121U109338 , R & D reports Title Research and forecast assessments of the nuclear safety state of the "New safe confinement - Shelter object" complex at the stage of its operation popup.stage_title Head Nosovskyi Anatolii V., Доктор технічних наук Registration Date 08-02-2024 Organization Institute for Safety Problems of Nuclear Power Plants of the National Academy of Sciences of Ukraine popup.description2 The purpose of the work: increasing the effectiveness of ensuring the nuclear safety of the NSC-SO complex by means of a computational and experimental study of the neutron-physical characteristics of the nuclear hazardous materials accumulation located inside this complex, as well as the development of recommendations for the implementation of methods to exclude the conditions for the occurrence of a self-sustaining fission chain reaction in the environment in the medium that propagates neutrons. Research methods: Mathematical simulation in MAPLE and MCNP-6.2 program codes. The most important results: For the first time in the MCNP-6.2 program code, a physical model of the neutron-breeding medium, a nuclear-hazardous accumulation of FCM in the NSC-SO complex was developed, which takes into account the version of their formation due to the interaction of the heat-emitting melt of corium origin and the concrete of the sub-reactor plate. An algorithm for estimating the current and predicted subcritical level of a nuclear-hazardous FCM cluster (effective neutron multiplication factor) was developed and implemented in the MAPLE 2015 program code based on the results of data analysis of neutron flux density monitoring performed by the Nuclear Safety Control System of the Integrated Automated Control System of the NSC-SO complex. Based on the results of applying the MCNP-6.2 software code and carrying out a series of variational calculations using the developed model, conclusions were drawn regarding the influence of the degree of heterogeneity of the neutron propagating medium and the mass of uranium on the increase of the effective neutron propagation coefficient in the process of gradual loss of moisture by the material medium of FCM. Product Description popup.authors Doroshenko Anatolii O. Mykhailov Oleksandr V. Saveliev Maksym V. popup.nrat_date 2024-02-08 Close