Analysis of floor response spectra of TMSR-LF1 considering soil-structure interaction

Abstract

BackgroundThe floor response spectra of the nuclear reactor building is of great significance to the seismic analysis and design of the whole reactor system.PurposeThis study aims to get accurate floor response spectra of 2MW thorium molten salt reactor-liquid fuel 1 (TMSR-LF1).MethodsA three-dimensional finite element model coupling with beam, shell and solid was established by ANSYS finite element analysis (FEA) software. The results of floor response spectra considering the soil-structure interaction (SSI) effect were obtained by direct method. Finally, comparison analyses of different floors, different inputs and different damping ratios were carried out.ResultsThe computation results show that the above-ground floor response spectra are much larger than that of the underground part, and the spectral values vary greatly due to the structure, load and other factors. The response spectra of each floor on the ground are larger in the vertical direction than in the horizontal direction.ConclusionsIn the seismic design of nuclear facilities, it is suggested to increase the vertical stiffness of the ground floor. The results of this study lay preliminary basis for seismic safety assessment of TMSR-LF1.

Keywords

• floor response spectra
• soil-structure interaction
• nuclear reactor building
• tmsr-lf1