Methodology for Modeling the Spread of Radioactive Substances in Case of an Emergency Release  at a Nuclear Power Plant

Levchenko, Larysa; Biliaiev, Mykola; Biliaieva, Viktoriia; Ausheva, Nataliia; Tykhenko, Oksana

doi:10.20998/2522-9052.2023.3.02

Cited by 2 publications

(2 citation statements)

References 7 publications

(9 reference statements)

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“…An effective method of designing ventilation systems with the required parameters is the modeling of the distribution of air flows that carry air ions. The application of approaches to modeling the propagation of particles with air flow is given in [14]. Using velocity-potential ratios instead of the Navier-Stokes equation provides an acceptable error and speeds up the calculation process.…”

Section: Discussion Of the Results Of Research Into The Processes Of ...mentioning

confidence: 99%

Study of air deionization factors

Tykhenko,

Glyva,

Levchenko

et al. 2024

EEJET

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The object of research is the dynamics in the concentration of air ions and suspended particles in atmospheric air and in supply-exhaust ventilation systems. An urgent task is to determine the factors and obtain quantitative data on the deionization of the atmospheric air that enters the environment where people live. Quantitative data on changes in the concentration of air ions depending on the time of day, temperature, and relative air humidity have been established. It was shown that even in the absence of significant man-made influence on the concentration of suspended particles, this indicator is at least 7000 cm-3. In the presence of wind, this indicator reaches 30000 cm-3 and higher. Measurement of the spectrum of suspended particles in the range of 0,3–6,0 μm showed that the predominant fraction is particles with sizes of about 3 μm. Studies have been conducted on changes in the concentrations of air ions in supply-exhaust ventilation systems. It was established that in the air duct made of galvanized iron, which has a length of 16 m, the concentration of negative air ions is reduced by 67 %, and positive by 78 %. Laboratory studies of air deionization in air ducts made of different materials were carried out. There is significant air deionization in metal and cardboard ducts while it is absent in wooden ducts. This indicates the electrical nature of deionization. A calculation method for forecasting the aero-ionic mode of premises, taking into account the factors of air deionization, is proposed. For rooms with supply-exhaust ventilation, a calculation apparatus is proposed taking into account the air exchange rate (the number of complete air changes per unit of time). The results make it possible to choose the required performance of artificial air ionization devices for normalizing the aero-ionic regimes in the premises

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Section: Discussion Of the Results Of Research Into The Processes Of ...mentioning

confidence: 99%

Study of air deionization factors

Tykhenko,

Glyva,

Levchenko

et al. 2024

EEJET

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“…At the same time, the dynamics of the development of accidents is not taken into account. The study [9] laid the methodological foundations for modeling the spread of a cloud radioactive substances, which is formed in the event of an emergency release of a reactor. The application of the velocity potential equation to build the emission propagation model allows you to speed up the calculation process.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Distribution of Emergency Release Products at a Nuclear Power Plant Unit

Biliaieva,

Levchenko,

Myshchenko

et al. 2024

A.I.S.

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Despite the fact that much attention is paid to the safe operation of nuclear power plants, there is a possibility of an accident with the release of radionuclides. This is especially true in Ukraine, where there is a threat of the damage to nuclear reactors as a result of military operations. It is impossible to research the distribution of products emergency releases radioactive substances in laboratory conditions. Therefore, the only tool for the development predicting of an accident is the modeling the spread of a radionuclides cloud. The purpose of the research is a modeling the distribution of emergency release products in a nuclear power plant unit, suitable for the operative assessment of a development an accident. Results of the research: The mathematical model of the distribution emission products of a nuclear power plant has been developed, which takes into account the value of the initial activity of emission products, the rate of the settling radioactive particles, the wind speed components, the intensity changes radionuclide emission over time. The technique for solving the boundary value problem of modeling in conditions of a complex shape of the computational domain, taking into account the presence of obstacles to the spread of emission products has been developed. The use of the velocity potential equation in evolutionary form allows us to speed up the calculation process. The chosen splitting scheme of an alternating-triangular method allows to find the speed potential according to the explicit form at each splitting step. This allowed software implementation of the CFD model. The visualized models of the emission cloud distribution allow to determine the radiation situation in any place of the emission product distribution zone. The developed model makes it possible to quickly predict the development of an accident in space and time, which makes it possible to take measures to protect people from exposure in the shortest possible time. Conclusions: The obtained emission cloud propagation models and their visualization make it possible to determine the state of environmental pollution under various initial conditions during the development of the accident.

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Methodology for Modeling the Spread of Radioactive Substances in Case of an Emergency Release at a Nuclear Power Plant

Cited by 2 publications

References 7 publications

Study of air deionization factors

Study of air deionization factors

Modeling the Distribution of Emergency Release Products at a Nuclear Power Plant Unit

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