Three-Dimensional Modeling as a Tool
for Improving the Safety Culture During Work
at Radiation-Nuclear Facilities

S. S. Pidbereznyi, Ye. A. Menshenin, D. V. Fedorchenko

Institute for Safety Problems of Nuclear Power Plants, NAS of Ukraine, 36a, Kirova st., Chornobyl, 07270, Ukraine

DOI: doi.org/10.31717/2311-8253.23.2.2

Abstract

As work is planned at the Shelter object (SO), minimizing doses to the personnel involved in these work is of great importance. This is of particular importance for the construction work with the dismantling of the structure, which is characterized by large collective effective doses, which are taken by the personnel during the hour of its implementation. The need to assign personnel doses, as well as optimize approaches to the radiation protection and, first of all, biological protection, is related to this already at the design stage. As the radiation situation will change during the dismantling of unstable structures, design solutions must take into account possible changes in the radiation dose when planning protective measures. To determine the intensity of the gamma radiation dose, a method of mathematical modeling based on the “point kernel” model is proposed. This approach makes it possible to carry out calculation and analysis of the radiation situation practically in real time. By means of the ChNPP VRdose Planner Pro program, a three-dimensional model of the SO roof outer shell with selected sources of gamma radiation and building structures with the protective screens properties was built. The radiation situation analysis was made and a radiation field visual display above the roof was shown. Models of building structures were created, which to some extent shield gamma radiation emanating from the SO Central Hall. Three-dimensional modeling of the early dismantled building structures was carried out using the program ChNPP VRdose Planner Pro v. 2.2.2. The application of methods of modeling radiation conditions during planning and execution of work in radiation-hazardous conditions will make it possible optimizing design solutions regarding the dismantling of unstable structures of the Shelter object, as well as optimizing the structure of radiation protection of personnel. The software package is a convenient tool for performing calculations of estimated exposure doses in radiation-hazardous conditions, enables quick and visual modeling of alternative work execution options, and enables optimization of the work performance process and personnel behavior in radiation-hazardous conditions. Based on the simulation, it is possible to create an interactive software package on the Chornobyl nuclear power plant training center for detailed personnel education and training. The results of the radiation situation analysis can be used in the performance of work planning in radiation-hazardous conditions to ensure the personnel protection in accordance with the ALARA principle.

Keywords: ChNPP VRdose Planner Pro v. 2.2.2, gamma radiation, Shelter object

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