PSI - Issue 73

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2025) 000–000 ScienceDirect

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Procedia Structural Integrity 73 (2025) 73–80

23rd International Conference on Modelling in Mechanics 2025 Experimental and numerical analysis of atypical shape of NPP structures and ventilation chimney under extreme wind load Juraj Králik a , Juraj Králik, jr. b * a IFE Faculty of Civil Engineering, STU Bratislava, Radlinského 11, 810 05 Bratislava, Slovakia b ISAEB, Faculty of Architecture and Design STU in Bratislava, Námestie slobody 19, 812 45 Bratislava, Slovakia Abstract This paper describes the experimental and numerical analysis of the wind impact on the NPP structures and ventilation chimney considering the effect of surrounding buildings. Some of the effects of wind, especially interference, are still the subject of research and experimental measurements. STN EN 1991-1-4 can only provide external wind coefficients for standard building or chimney shapes without consideration of mutual interaction. Wind flow around a chimney with nearby buildings is based on the distances between them and local wind speeds. This article discusses the effects of wind flow around the ventilation stack and nuclear power plant buildings. From the experimental measurements in this location, extreme wind loads with a probability of occurrence of 10 -4 per year were determined based on the requirements of the IAEA and NRC standards. In this paper, CFD numerical analysis was performed to investigate the perturbation effects in turbulent wind flow. The results of wind pressure distribution above the NPP buildings and ventilation chimney in locality Jaslovské Bohunice (EBO V2) were compared between the numerical CFD analysis and the European standard STN EN 1991-1-4. 23rd International Conference on Modelling in Mechanics 2025 Experimental and numerical analysis of atypical shape of NPP structures and ventilation chimney under extreme wind load Juraj Králik a , Juraj Králik, jr. b * a IFE Faculty of Civil Engineering, STU Bratislava, Radlinského 11, 810 05 Bratislava, Slovakia b ISAEB, Faculty of Architecture and Design STU in Bratislava, Námestie slobody 19, 812 45 Bratislava, Slovakia Abstract This paper describes the experimental and numerical analysis of the wind impact on the NPP structures and ventilation chimney considering the effect of surrounding buildings. Some of the effects of wind, especially interference, are still the subject of research and experimental measurements. STN EN 1991-1-4 can only provide external wind coefficients for standard building or chimney shapes without consideration of mutual interaction. Wind flow around a chimney with nearby buildings is based on the distances between them and local wind speeds. This article discusses the effects of wind flow around the ventilation stack and nuclear power plant buildings. From the experimental measurements in this location, extreme wind loads with a probability of occurrence of 10 -4 per year were determined based on the requirements of the IAEA and NRC standards. In this paper, CFD numerical analysis was performed to investigate the perturbation effects in turbulent wind flow. The results of wind pressure distribution above the NPP buildings and ventilation chimney in locality Jaslovské Bohunice (EBO V2) were compared between the numerical CFD analysis and the European standard STN EN 1991-1-4. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the event organizers © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of 23rd International Conference on Modelling in Mechanics 2025 organizers Keywords: Extreme wind, Experimetal and Numerical Analysis, NPP, Structures, Chimney; © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of 23rd International Conference on Modelling in Mechanics 2025 organizers Keywords: Extreme wind, Experimetal and Numerical Analysis, NPP, Structures, Chimney;

* Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: kralikj52@gmail.com

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of 23rd International Conference on Modelling in Mechanics 2025 organizers 2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of 23rd International Conference on Modelling in Mechanics 2025 organizers * Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: kralikj52@gmail.com

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the event organizers 10.1016/j.prostr.2025.10.012