A Seismic Design of Nuclear Reactor Building Structures Applying Seismic Isolation System in a High Seismicity Region –A Feasibility Case Study in Japan-

Kubo, Tetsuo; Yamamoto, T.; Sato, Kunihiko; Jimbo, Masakazu; Imaoka, Tetsuo; Umeki, Yoshito

doi:10.5516/net.09.2014.716

Cited by 18 publications

(6 citation statements)

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“…Several analytical or empirical solutions were found for this problem; for instance, see [32][33][34][35][36] for the analytical solutions and [37] for the empirical solutions. These solutions were applied to model the soil domain as sway-rocking spring for a range of structures; see [38][39][40][41][42], as well as to develop numerical analysis programs such as CLASSI [43], FLUSH [44] and SASSI [45]. Further extending this approach, several more complex models, termed as lumped parameter models for SSI analysis, are also developed; see [46][47][48].…”

Section: Substructure Methods For Evaluation Of Ssimentioning

confidence: 99%

Review of Soil-Structure Interaction Based on Continuum Mechanics Theory and Use of High Performance Computing

2021

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Recent achievement of research on soil-structure interaction (SSI) is reviewed, with a main focus on the numerical analysis. The review is based on the continuum mechanics theory and the use of high-performance computing (HPC) and clarifies the characteristics of a wide range of treatment of SSI from a simplified model to a high fidelity model. Emphasized is that all the treatment can be regarded as the result of the mathematical approximations in solving a physical continuum mechanics problem of a soil-structure system. The use of HPC is inevitable if we need to obtain a solution of higher accuracy and finer resolution. An example of using HPC for the analysis of SSI is presented.

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Section: Substructure Methods For Evaluation Of Ssimentioning

confidence: 99%

Review of Soil-Structure Interaction Based on Continuum Mechanics Theory and Use of High Performance Computing

2021

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“…In the simulations, the equivalent characteristics of isolators (three-dimensional systems with horizontal and vertical isolations provided in one single interface) are expressed through the effective stiffness and effective damping of the device [25]: best-estimate mechanical properties, such as horizontal and vertical equivalent stiffness and damping, are used. These properties, which were experimentally determined by testing SI-H 500/50 prototypes, are presented in the following subsection.…”

Section: Fem Modellingmentioning

confidence: 99%

Benefits of Seismic Isolation for Nuclear Structures Subjected to Severe Earthquake

Frano

2018

Science and Technology of Nuclear Installations

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The Fukushima accident has reiterated that the seismic safety is a clear necessity in the design of nuclear power plants. To overcome the weaknesses of the plant design, appropriate measures or interventions have thus to be put in place to improve the nuclear safety. In this study, seismic isolation, widely adopted for conventional constructions, is considered as retrofit measure to provide superior performance of plant itself, even when exceptional events occur. In this paper, we numerically investigate the dynamic behaviour of a Small Modular Reactor (SMR) plant subjected to 0.6g PGA; in doing that time-history analysis has been performed assuming the reactor building with and without isolators. For that purpose, a suitable FEM model has been implemented to provide in-structure response spectra at safety relevant locations and subsystem supports. Adequate steel and concrete properties as well as isolators properties, experimentally determined, have been assumed. Results have shown the benefits of seismic isolation for NPP that can so sustain levels of loading beyond the design input and demonstrated that failure of an isolation system cannot occur before failure of the isolated structure. However, the large horizontal displacements of the structure require appropriate considerations in the layout and interfaces for interconnected systems.

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“…2021, 11, 4431 2 of 17 developed in many countries for nuclear applications because they can support very heavyweight and are very flexible in shear deformation against horizontal earthquakes. Due to these characteristics, LRBs have been generally developed for seismic isolation of buildings [10][11][12][13][14][15][16]. There are many studies on shaking table tests of LRBs for a building structure seismic isolation, but most of them are performed with the reduced scale LRBs [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Shaking Table Tests of Lead Inserted Small-Sized Laminated Rubber Bearing for Nuclear Component Seismic Isolation

Koo

Shin

2021

Applied Sciences

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To assure seismic isolation performance against design and beyond design basis earthquakes in the nuclear facility components, the lead inserted small-sized laminated rubber bearings (LRB), which has a 10 kN vertical design load, have been designed and quasi-statically tested to validate their design mechanical properties in previous studies. Following this study, the seismic shaking tests of these full-scale LRBs are performed and discussed in this paper with the dummy mass system to investigate actual seismic isolation performance, dynamic characteristics of LRBs, consistency of the LRB’s quality, and so on. To study the seismic isolation performance, three beam structures (S1–S3) with different natural frequencies were installed both on the shaking table and the dummy mass supported by four LRBs: (1) S1: structure close to seismic isolation frequency; (2) S2: structure close to peak input spectral frequency; (3) S3: structure in the high-frequency region. The test results are described in various seismic levels of OBE (Operating Basis Earthquake), SSE (Safe Shutdown Earthquake), and BDBE (Beyond Design Basis Earthquake), and are compared with the analysis results to assure the seismic isolation performance and the LRB’s design parameters. From the results of the shaking table tests, it is confirmed that the lead inserted small-sized LRBs reveal an adequate seismic isolation performance and their dynamic characteristics as intended in the LRB design.

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A Seismic Design of Nuclear Reactor Building Structures Applying Seismic Isolation System in a High Seismicity Region –A Feasibility Case Study in Japan-

Cited by 18 publications

References 1 publication

Review of Soil-Structure Interaction Based on Continuum Mechanics Theory and Use of High Performance Computing

Review of Soil-Structure Interaction Based on Continuum Mechanics Theory and Use of High Performance Computing

Benefits of Seismic Isolation for Nuclear Structures Subjected to Severe Earthquake

Shaking Table Tests of Lead Inserted Small-Sized Laminated Rubber Bearing for Nuclear Component Seismic Isolation

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