Deterministic and Probability Analysis of Paper Machine Vibration Impact to the Structure Safety and Human Comfort

This paper describes the probability and sensitivity analysis of the concrete frame and paper machine interaction. On the base of the experimental results, the calculation FEM model was verified. The uncertainties of the loads level, the material properties and other influences following the inaccuracy of the calculated model and numerical methods were considered in the approximation method RSM

Analysis of Soil-Structure Interaction Effects of NPP Structures on Nonhomogeneous Subsoil

This paper describes the soil-structure interaction (SSI) effects to the Nuclear Power Plant (NPP) structure with reactor VVER-1200. The simplified 1D and numerical 3D FE models of the nonhomogeneous subsoil are investigated. The methodology of the calculation of the frequency dependent complex functions of the soil stiffness and damping is presented

Deterministic and probabilistic analysis of npp communication bridge resistance due to extreme loads

This paper presents the experiences from the deterministic and probability analysis of the reliability of communication bridge structure resistance due to extreme loads - wind and earthquake. On the example of the steel bridge between two NPP buildings is considered the efficiency of the bracing systems. The advantages and disadvantages of the deterministic and probabilistic analysis of the structure resistance are discussed. The advantages of the utilization the LHS method to analyze the safety and reliability of the structures is presented

Nonlinear analysis of the failure of nuclear hermetic reinforced concrete structure due to extreme pressure and temperature

This paper describes the nonlinear analysis of the reinforced concrete hermetic containment under an accidental temperature. The scenario of the hard accident in NPP and the methodology of the calculation of the failure temperature using the safety assessment are presented. The experimental and project material properties are taken into account in the safety assessment

CFD simulation of air flow over an object with gable roof, revised with Y+ approach

Aim of this contribution is to provide insight view into analysis focused on obtaining external pressure coefficients on isolated two storey low-rise building with 15° elevation gable roof using Computer Fluid Dynamics simulation and these are compared to values that offering Eurocodes. Final Volume Model consisting of polyhedral mesh will be used for analysis with two different turbulence models. Mesh was created with respect to y+ parameter, where desired value was below one which leads us to fine mesh type. Secondary aim of this contribution is to compare performance of selected turbulence models. For this purpose were chosen Detached Eddy Simulation and Large Eddy Simulation which are part of the Scale Resolving Simulation turbulence models

Optimálny návrh ochrany haly reaktorovne pred pádom kontajnera s jadrovým palivom využitím simulačných metód

This paper presents of the optimal design of the damping devices cover of reactor hall under impact of nuclear fuel container drop of type TK C30. The finite element idealization of nuclear power plant structure is used in software ANSYS. The steel pipe damper system is proposed for dissipation of the kinetic energy of the container free fall in comparison with the experimental results. The probabilistic and sensitivity analysis of the damping devices was considered on the base of the simulation methods in program AntHill using the Monte Carlo methodV článku sa prezentuje optimálny návrh tlmiaceho zariadenia na ochranu haly reaktorovne pred pádom kontajnera s jadrovým palivom typu TK C30. Priestorovým konečno-prvkovým modelom bola idealizovaná konštrukcia jadrovej elektrárne v programe ANSYS. Experimentálne overený systém tlmičov bol navrhnutý z oceľových rúrok na pohltenie kinetickej energie od pádu kontajnera. Pravdepodobnostná a citlivostná analýza tlmiaceho zariadenia bola realizovaná využitím simulačných metód v programe AntHill s využitím metódy Monte Carl

Probabilistic nonlinear analysis of reinforced concrete bubbler tower structure failure

This paper describes the reliability analysis of concrete bubbler tower structure of nuclear power plant with the reactor WWER 440 under high internal overpressure. There is showed summary of calculation models and calculation methods for the probability analysis of the structural integrity considering degradation effects and high internal overpressure. The uncertainties of the resistance and the calculation model were taking in the account in the RSM method.This paper describes the reliability analysis of concrete bubbler tower structure of nuclear power plant with the reactor WWER 440 under high internal overpressure. There is showed summary of calculation models and calculation methods for the probability analysis of the structural integrity considering degradation effects and high internal overpressure. The uncertainties of the resistance and the calculation model were taking in the account in the RSM method

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

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

Dynamic analysis of soil-structure interaction effects on NPP building using simplified and solid FE model of layered subsoil

This paper describes the soil-structure interaction (SSI) effects to the Nuclear Power Plant (NPP) structure with reactor VVER-1200/491 PWR. The simplified 1D and numerical 3D FE models of the layered subsoil are investigated. The methodology of the calculation of the frequency dependent complex functions of the soil stiffness and damping is presented