Experimental and Numerical Analysis of the Hermetic Tightness of NPP Bubble Tower Structure

Králik, Juraj

doi:10.1016/j.proeng.2017.05.366

Cited by 7 publications

(5 citation statements)

References 7 publications

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“…The CRACK program, which was developed by the author and implemented into the ANSYS system [3,[14][15][16][17][18], was used to perform the nonlinear analyses. The uncertainties of the load levels (temperature, dead and live loads), the material model of the composite structure (concrete cracking and crushing), reinforcement, and liner as well as other influences following from the inaccuracy of the calculated model and the numerical methods were taken into account in the Monte Carlo simulations [3].…”

Section: Discussionmentioning

confidence: 99%

“…In the case of the loss-of-coolant accident (LOCA) [3,17,18], the steam pressure expands from the reactor hall to the bubble condenser. Hence, the reactor hall and the bubble condenser are the critical structures of the NPP hermetic zone.…”

Section: Safety Of the Npp Structure Resistancementioning

confidence: 99%

“…To achieve proper results, a detailed finite-element analysis of the concrete structure was carried out using ANSYS software and the programs CRACK [3,[14][15][16][17][18] were employed to solve this task. The basis for the probabilistic evaluation is reviewed, considering the uncertainties connected with loads and material properties.…”

Section: Safety Of the Npp Structure Resistancementioning

confidence: 99%

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Risk Assessment of NPP Safety in Case of Emergency Situations on Technology

Králik¹

2017

Recent Improvements of Power Plants Management and Technology

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The last accidents of the nuclear power plant (NPP) in Chernobyl and Fukushima give us the new inspiration to verify the safety level of the NPP structures. This paper presents the new requirements to test the safety and reliability of the NPP structures due to the recent accidents in the world. The IAEA in Vienna required in the document 'Stress tests' the verification of the safety of the NPP structures under impact of the extreme loads as the earthquakes, the extreme climatic actions and the technology accidents. The new recommendations to load combinations and design criteria were defined. The risk assessment to verify the safety and reliability of the NPP structures based on probabilistic and nonlinear analysis is presented. The uncertainties of material model (behaviour of the reinforcement and liner, concrete cracking and crushing), degradation effects, the loads level (dead and live loads, extreme climatic and accidental temperature and overpressure) as well as other effects following from the inaccuracy of the calculated model and numerical methods were taken into account in the response surface method (RSM) method. The results of the deterministic and probabilistic analysis of the NPP structures are presented.

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Section: Discussionmentioning

confidence: 99%

Section: Safety Of the Npp Structure Resistancementioning

confidence: 99%

Section: Safety Of the Npp Structure Resistancementioning

confidence: 99%

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Risk Assessment of NPP Safety in Case of Emergency Situations on Technology

Králik¹

2017

Recent Improvements of Power Plants Management and Technology

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“…Numerous numerical methods, mostly based on the finite element method -FEM [9][10][11][12], have been developed to aid in the understanding of the behavior of the fatigue phenomena. The essential tools for these calculations are provided by fracture mechanics [13] and the reliability theory [14,15]. Some of approaches used for the fatigue crack prediction are based on stochastic methods [16,17].…”

Section: Introductionmentioning

confidence: 99%

Probabilistic fatigue analysis of existing steel structure

et al. 2020

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The paper deals with evaluation of possible fatigue damage of existing steel crane structure. It is possible to use the some traditional methods to solve the problem - a concept of fatigue S-N curves (which are mainly used for designing of a new structures) or the procedures based on linear fracture mechanics utilizing the Paris-Erdogan’s law (which are suitable for estimation of remaining lifetime). For the resistance assessment the relevant data of load effects caused by cyclically loaded structure operation are necessary for both concepts. For the prediction of fatigue damage over time, calibration functions for short edge cracks were derived based on the results of the experiment, and the acceptable size of the fatigue crack in damaged structural component under analysis was determined. Using the derived relationships, a stochastic analysis of the selected element was performed and the results are discussed.

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“…Common studies of the misalignment of failure probability over time tend to focus on structural details or system (e.g. Kralik, 2017;Vican et al, 2016 andKala, 2015), however, a comprehensive probabilistic methodology generally applicable to bridge structures is currently missing.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of fatigue damage on selected connection of the crane bridge support structure

2018

Engineering Mechanics

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The article deals with a numerical analysis of selected connection of diagonal of the steel truss structure supporting the crane track. The analysis focused on the prediction of fatigue damage of the most stressed members. The initial static analysis of the entire structure helped to determine the influence lines for the selected elements. The main goal of this article is numerical model of particular connection of diagonal. Numerical model uses the variable load amplitude obtained from probability analysis converted to the amplitude spectrum of static magnitudes like input parameters. The Rain Flow method from software ANSYS Workbench is used for fatigue analysis of numerical model. The critical parts in terms of fatigue and life expectancy are identifying by this approach.

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Experimental and Numerical Analysis of the Hermetic Tightness of NPP Bubble Tower Structure

Cited by 7 publications

References 7 publications

Risk Assessment of NPP Safety in Case of Emergency Situations on Technology

Risk Assessment of NPP Safety in Case of Emergency Situations on Technology

Probabilistic fatigue analysis of existing steel structure

Numerical analysis of fatigue damage on selected connection of the crane bridge support structure

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