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3D evaluation of thermal-hydraulic parameters and hydrogen distribution inside nuclear power plant containment due to LB-LOCA

Kanik, Muhammet Enis 2023. 3D evaluation of thermal-hydraulic parameters and hydrogen distribution inside nuclear power plant containment due to LB-LOCA. PhD Thesis, Cardiff University.
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Containment as the last barrier of defence in depth prevents uncontrolled releases of radioactive materials to the environment. Analysing the containment stability/integrity in nuclear accidents and the reliability of engineered safety features in reducing the thermal/pressure loads on the containment is a key step in safety assessment of nuclear power plants. Moreover, combustion of generated hydrogen during an accident might pose a risk to the containment safety. 3D evaluation of thermal-hydraulic parameters and hydrogen distribution considering their mitigation methods inside a VVER-1000/V446 containment during a large-break loss of coolant accident were considered in this research. To achieve this goal, in the first step, 3D model of VVER-1000/V446 containment was built in detail by using AutoCAD. Then, the geometry of the containment has been transferred from AutoCAD to a containment analysis code, GOTHIC, and the model has been finalized. In addition, the main 3D model has also been modified to a great extent (installing 80 passive autocatalytic recombiners and locating hydrogen sources) to evaluate the performance of hydrogen removal system inside the containment on keeping the hydrogen concentration below the flammability limit. 2D profiles of relevant parameters as well as 3D temperature and average volumetric hydrogen concentration contours are presented as the outcome of this study. The results were validated against the results of final safety analysis report. In this manuscript, chapter 1 will provide basic information about key concepts in nuclear safety and introduce past works related to the topic of the study. Chapter 2 will give detailed information about the case study reactor studied, particularly about the containment, and explain accident considered scenarios in simulations. Chapter 3 informs about the hydrogen in nuclear power plants. Chapter 4 provide information about the modelling procedures in detail. Finally, chapter 5 will present the results and discuss the simulation outcomes.

Item Type: Thesis (PhD)
Date Type: Completion
Status: Unpublished
Schools: Engineering
Uncontrolled Keywords: 1) Hydrogen Distribution 2) Passive Autocatalytic Recombiners (PARs) 3) Containment Pressurization 4) LOCA 5) GOTHIC 6) VVER-1000
Date of First Compliant Deposit: 24 January 2024
Last Modified: 25 Jan 2024 10:57

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