Feasibility study of full-scale elastic-plastic seismic response analysis of nuclear power plant

A finite element elastic-plastic seismic response analysis using a full-scale integrated model of Unit 1 of the Fukushima-Daiichi Nuclear Power Plant, which was subjected to the 2011 off the Pacific coast of Tohoku Earthquake, is performed using the K computer in order to obtain both the global and...

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Autores principales:	Tomoshi MIYAMURA, Shinobu YOSHIMURA, Tomonori YAMADA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2019
Materias:	three-dimensional finite element method seismic response analysis elastic-plastic analysis high-fidelity solid element mesh parallel computation k computer fukushima daiichi nuclear power plant Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/b22a484985c841b49035dafadd6eb5ed
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spelling	oai:doaj.org-article:b22a484985c841b49035dafadd6eb5ed2021-11-29T05:48:34ZFeasibility study of full-scale elastic-plastic seismic response analysis of nuclear power plant2187-974510.1299/mej.19-00281https://doaj.org/article/b22a484985c841b49035dafadd6eb5ed2019-10-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/6/6/6_19-00281/_pdf/-char/enhttps://doaj.org/toc/2187-9745A finite element elastic-plastic seismic response analysis using a full-scale integrated model of Unit 1 of the Fukushima-Daiichi Nuclear Power Plant, which was subjected to the 2011 off the Pacific coast of Tohoku Earthquake, is performed using the K computer in order to obtain both the global and local responses more precisely. The purpose of the present study is to investigate the computational performance and show the feasibility of such an analysis. The high-fidelity finite element mesh for the plant used in the present study was generated using tetrahedral elements in a previous study by Yoshimura et al. (2019a) for the pressure vessel, the containment vessel, the suppression chamber, the vent pipes, a number of supports, and the reactor building. The mesh with linear elements has approximately 200 million DOFs. The elastoplasticity is taken into account for only the steel used in the pressure and containment vessels. However, the material for the reactor building is assumed to be elastic. The dynamic response during 55 s is solved successfully, although yielding occurs at very few points. The total elapsed time for analysis is approximately 14.2 days using 1,032 nodes of the K computer. If the nonlinearity increases, the computation time may be increased by three to four times due to the increase in the number of Newton-Raphson iteration steps. Even in this case, the computation time can be estimated to be less than two months, which means that an elastic-plastic seismic response analysis of the plant using the high-fidelity finite element mesh is feasible. An elastic-plastic seismic response analysis using a quadratic element model with approximately 1.5 billion DOFs is also successfully conducted for 12 time steps (0.12 s) using 4,128 nodes of the K computer.Tomoshi MIYAMURAShinobu YOSHIMURATomonori YAMADAThe Japan Society of Mechanical Engineersarticlethree-dimensional finite element methodseismic response analysiselastic-plastic analysishigh-fidelity solid element meshparallel computationk computerfukushima daiichi nuclear power plantMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 6, Iss 6, Pp 19-00281-19-00281 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	three-dimensional finite element method seismic response analysis elastic-plastic analysis high-fidelity solid element mesh parallel computation k computer fukushima daiichi nuclear power plant Mechanical engineering and machinery TJ1-1570
spellingShingle	three-dimensional finite element method seismic response analysis elastic-plastic analysis high-fidelity solid element mesh parallel computation k computer fukushima daiichi nuclear power plant Mechanical engineering and machinery TJ1-1570 Tomoshi MIYAMURA Shinobu YOSHIMURA Tomonori YAMADA Feasibility study of full-scale elastic-plastic seismic response analysis of nuclear power plant
description	A finite element elastic-plastic seismic response analysis using a full-scale integrated model of Unit 1 of the Fukushima-Daiichi Nuclear Power Plant, which was subjected to the 2011 off the Pacific coast of Tohoku Earthquake, is performed using the K computer in order to obtain both the global and local responses more precisely. The purpose of the present study is to investigate the computational performance and show the feasibility of such an analysis. The high-fidelity finite element mesh for the plant used in the present study was generated using tetrahedral elements in a previous study by Yoshimura et al. (2019a) for the pressure vessel, the containment vessel, the suppression chamber, the vent pipes, a number of supports, and the reactor building. The mesh with linear elements has approximately 200 million DOFs. The elastoplasticity is taken into account for only the steel used in the pressure and containment vessels. However, the material for the reactor building is assumed to be elastic. The dynamic response during 55 s is solved successfully, although yielding occurs at very few points. The total elapsed time for analysis is approximately 14.2 days using 1,032 nodes of the K computer. If the nonlinearity increases, the computation time may be increased by three to four times due to the increase in the number of Newton-Raphson iteration steps. Even in this case, the computation time can be estimated to be less than two months, which means that an elastic-plastic seismic response analysis of the plant using the high-fidelity finite element mesh is feasible. An elastic-plastic seismic response analysis using a quadratic element model with approximately 1.5 billion DOFs is also successfully conducted for 12 time steps (0.12 s) using 4,128 nodes of the K computer.
format	article
author	Tomoshi MIYAMURA Shinobu YOSHIMURA Tomonori YAMADA
author_facet	Tomoshi MIYAMURA Shinobu YOSHIMURA Tomonori YAMADA
author_sort	Tomoshi MIYAMURA
title	Feasibility study of full-scale elastic-plastic seismic response analysis of nuclear power plant
title_short	Feasibility study of full-scale elastic-plastic seismic response analysis of nuclear power plant
title_full	Feasibility study of full-scale elastic-plastic seismic response analysis of nuclear power plant
title_fullStr	Feasibility study of full-scale elastic-plastic seismic response analysis of nuclear power plant
title_full_unstemmed	Feasibility study of full-scale elastic-plastic seismic response analysis of nuclear power plant
title_sort	feasibility study of full-scale elastic-plastic seismic response analysis of nuclear power plant
publisher	The Japan Society of Mechanical Engineers
publishDate	2019
url	https://doaj.org/article/b22a484985c841b49035dafadd6eb5ed
work_keys_str_mv	AT tomoshimiyamura feasibilitystudyoffullscaleelasticplasticseismicresponseanalysisofnuclearpowerplant AT shinobuyoshimura feasibilitystudyoffullscaleelasticplasticseismicresponseanalysisofnuclearpowerplant AT tomonoriyamada feasibilitystudyoffullscaleelasticplasticseismicresponseanalysisofnuclearpowerplant
_version_	1718407607813668864

Feasibility study of full-scale elastic-plastic seismic response analysis of nuclear power plant

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