On the effect of the 3-D regional geology on the seismic design of critical structures: the case of the Kashiwazaki-Kariwa Nuclear Power Plant

The traditional soil dynamic impedance models, recommended by the main international seismic design codes of the nuclear power plant (NPP), are only expressed by a single parallel connection system of spring and dashpot which can not reflect the dynamic stiffness varying with excitation frequencies, and also can not simulate the cases of non-homogeneous site conditions. With the recent development of soil-structure interaction (SSI) analysis, based on the damping-solvent extraction method (DSEM) and the lumped parameter models recommended by seismic design codes of ASCE4-98,RCCG which are all applicable to the homogeneous site and also massless foundation model and viscous-spring artificial boundary model of especially fit for the numerical simulation of non-homogeneous site, comparative study of both the direct method and sub-structure method is carried out in this paper. Finally, by taking the analysis of floor response spectra (FRS) for a certain CPR1000 reactor building as an example, comparative analyses of homogeneous and layered site conditions using various soil dynamic numerical models above-mentioned are performed. In addition, in order to validate the accuracy, the calculated results are compared to that of SASSI program. The results show that FRS in the horizontal direction are good agreement regardless for the homogeneous and layered site conditions, the shapes of FRS in the vertical direction change obviously in the homogeneous site condition. This paper provides some guidance and reference in the aspect of evaluation the seismic suitability for the site of nuclear power plant (NPP).

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A preliminary evaluation of the seismicity and tectonics of the Georgia Strait - Puget Sound region and their bearing on the seismic design parameters for the Skagit nuclear power plant site

10.4095/315403 ◽

1976 ◽

Author(s):

P W Basham ◽

D H Weichert ◽

H S Hasegawa ◽

W G Milne

Keyword(s):

Power Plant ◽

Nuclear Power Plant ◽

Seismic Design ◽

Nuclear Power ◽

Puget Sound ◽

Design Parameters ◽

Preliminary Evaluation ◽

Plant Site ◽

Seismicity And Tectonics ◽

Puget Sound Region

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Research on the Effect of a New Flexible Shielding Material on the Seismic Performance of Nuclear Piping

Volume 7: Fuel Cycle, Decontamination and Decommissioning, Radiation Protection, Shielding, and Waste Management; Mitigation Strategies for Beyond Design Basis Events ◽

10.1115/icone25-66693 ◽

2017 ◽

Author(s):

Feng Liu ◽

Yulong Li ◽

XiaJie Liu ◽

Bing Bai ◽

Yong-hong Lv ◽

...

Keyword(s):

Power Plant ◽

Nuclear Power Plant ◽

Seismic Performance ◽

Seismic Design ◽

Nuclear Power ◽

Dynamical Behavior ◽

Pipeline System ◽

Earthquake Action ◽

Shielding Material ◽

Maximum Stresses

The present paper provide an available FEA method for the structural analysis and seismic design of pipelines coated with flexible shielding materials, in nuclear power plant, subjected to earthquake action. The modal and spectral analysis are carried out by using FEM software ANSYS. By comparing the numerical simulation results of dynamical behavior of the pipelines with or without flexible shielding materials, the effects of the flexible shielding material on the seismic performance of the pipeline system in nuclear power plant are discussed. Finally, a local supporting constraint for reducing seismic effects is put forward, which can significantly decrease the maximum stresses in the pipelines coated with flexible shielding materials.

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