Numerical Simulation System "Three-Dimensional Virtual Plant Vibration Simulator" for Nuclear Plants by Using Assembled Structural Analysis

Nishida, Atsushi; Matsubara, Hitoshi; Tian, Rong; Hazama, Osamu; Suzuki, Yoshishige; Araya, Fumimasa; Nakajima, N.; Tani, Masayuki; Kondō, Makoto

doi:10.3327/taesj.j06.021

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…∂x k is the turbulence production tensor and Π i j = Π (1) i j + Π (2) i j + Π (3) i j is the correction term between the pressure and the strain, where…”

Section: Launder-gibson (Lg) Modelmentioning

confidence: 99%

“…Therefore, robust measures are required to ensure the safety of NPPs. The Center for Computational Science and E-systems (CCSE)/JAEA has been promoting research and development for designing a virtual plant vibration simulator on interconnected supercomputers on the basis of structural analysis (2) . Recently, we have started upgrading the simulator by considering seismic fluid flow in NPPs in order to comprehensively evaluate the seismic safety of NPPs (3) .…”

Section: Introductionmentioning

confidence: 99%

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Effect of Turbulent Dissipation on the Dynamics of Dam Break Flow

Uzawa

Watanabe

2012

JPES

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The effect of turbulence on the dynamics of three-dimensional dam break flow is numerically investigated on the basis of the incompressible Reynolds-averaged Navier-Stokes (RANS) equations with the volume of fluid (VOF) function. It is found that the tip velocity over the ground and the impact pressure on the vertical wall in the Launder-Gibson (LG) model are in good agreement with experimental results. The dynamics of the dam break flow is subject to the viscous dissipation during the collapse of the flow, which is underestimated in the laminar model and overestimated in the realizable k − (RKE) model. The turbulent viscous dissipation near the free surface is comparable to that in the water in the LG model.

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“…∂x k is the turbulence production tensor and Π i j = Π (1) i j + Π (2) i j + Π (3) i j is the correction term between the pressure and the strain, where…”

Section: Launder-gibson (Lg) Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Turbulent Dissipation on the Dynamics of Dam Break Flow

Uzawa

Watanabe

2012

JPES

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“…We focus on the joints connecting the component supports and the building walls, which generally involve fixed/pinned boundary conditions. By introducing this elastic-plastic connection model into a large-scale elastic structural model, 5) it becomes possible to analyze the gestalt structural response, including all the local elastic-plastic behaviors of structures at the connections. In this manner, it becomes possible to evaluate both global and local behaviors of the structure.…”

mentioning

confidence: 99%

Elastic-Plastic Connection Model Describing Dynamic Interactions of Component Connections

Nishida

Araya

Kushida

et al. 2011

Progress in Nuclear Science and Technology

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Design evaluation of nuclear facilities would be facilitated by a numerical evaluation system that can evaluate both global and local behaviors under severe seismic loading. A critical part of such a system is the numerical model describing the dynamic physical interactions among component connections, called the elastic-plastic connection model. Here we propose such a model and use it to simulate dynamic interactions using real earthquake and plant data from the High Temperature Engineering Test Reactor (HTTR) at the Oarai Research and Development Center of the JAEA. We focus on joints connecting the component supports and the building walls, which generally involve fixed/pinned boundary conditions. Precision was increased by adjusting model parameters to fit experimental data. The results confirmed a reduction in the vibration response and a change in the natural frequencies of individual components under large virtual earthquake loading, which are considered to have resulted from dynamic interactions between the joints connecting the component supports and the building walls.

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Construction of Vibration Table in an Extended World for Safety Assessment of Nuclear Power Plants

Yamada

Araya

2009

High Performance Computing on Vector Systems 2009

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Numerical Simulation System "Three-Dimensional Virtual Plant Vibration Simulator" for Nuclear Plants by Using Assembled Structural Analysis

Cited by 4 publications

References 2 publications

Effect of Turbulent Dissipation on the Dynamics of Dam Break Flow

Effect of Turbulent Dissipation on the Dynamics of Dam Break Flow

Elastic-Plastic Connection Model Describing Dynamic Interactions of Component Connections

Construction of Vibration Table in an Extended World for Safety Assessment of Nuclear Power Plants

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