Influence of dead weight and internal pressure to seismic buckling probability of fast reactor vessels

Seismic buckling of vessels is one of main concerns for the design of fast reactor plants in Japan. Rational design is important because of two conflicting requirements; thicker walls are preferable to prevent seismic buckling of vessels, while excessively thick walls introduce large thermal stress...

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Autores principales:	Shigeru TAKAYA, Naoto SASAKI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2020
Materias:	load and resistance factor design partial safety factor target buckling probability maximum allowable stress seismic hazard Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/5cf46bc69a634982adf1021e752b746f
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spelling	oai:doaj.org-article:5cf46bc69a634982adf1021e752b746f2021-11-29T05:56:30ZInfluence of dead weight and internal pressure to seismic buckling probability of fast reactor vessels2187-974510.1299/mej.19-00549https://doaj.org/article/5cf46bc69a634982adf1021e752b746f2020-03-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/7/3/7_19-00549/_pdf/-char/enhttps://doaj.org/toc/2187-9745Seismic buckling of vessels is one of main concerns for the design of fast reactor plants in Japan. Rational design is important because of two conflicting requirements; thicker walls are preferable to prevent seismic buckling of vessels, while excessively thick walls introduce large thermal stress causing unacceptable creep–fatigue interaction damage. In previous studies, we discussed evaluation methods of seismic buckling probability of vessels by taking account of seismic hazards in order to rationalize seismic buckling evaluation, and proposed a rule for seismic buckling of vessels based on the load and resistant factor design method. The proposed rule is expected to widen design window regarding seismic buckling and contribute to more reasonable design of vessels of fast reactors. However, there is still a room for more rational design. The proposed method deals with only seismic load, but in actuality, dead weight and internal pressure also exist. The existence of these loads contributes to reducing the buckling probability because axial compressive load decreases. In this study, the rule was expanded so that dead weight and internal pressure can be taken into account. Furthermore, the influences of dead weight and internal pressure to seismic buckling evaluation were discussed. As result, it was shown that approximately 10 to 20% of further rationalization of allowable seismic load could be achieved by considering dead weight and internal pressure in the evaluation. In addition, it was found that the previously proposed design rule, not considering dead weight and internal pressure, includes approximately 2 to 10 times margins in terms of seismic buckling probability.Shigeru TAKAYANaoto SASAKIThe Japan Society of Mechanical Engineersarticleload and resistance factor designpartial safety factortarget buckling probabilitymaximum allowable stressseismic hazardMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 7, Iss 3, Pp 19-00549-19-00549 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	load and resistance factor design partial safety factor target buckling probability maximum allowable stress seismic hazard Mechanical engineering and machinery TJ1-1570
spellingShingle	load and resistance factor design partial safety factor target buckling probability maximum allowable stress seismic hazard Mechanical engineering and machinery TJ1-1570 Shigeru TAKAYA Naoto SASAKI Influence of dead weight and internal pressure to seismic buckling probability of fast reactor vessels
description	Seismic buckling of vessels is one of main concerns for the design of fast reactor plants in Japan. Rational design is important because of two conflicting requirements; thicker walls are preferable to prevent seismic buckling of vessels, while excessively thick walls introduce large thermal stress causing unacceptable creep–fatigue interaction damage. In previous studies, we discussed evaluation methods of seismic buckling probability of vessels by taking account of seismic hazards in order to rationalize seismic buckling evaluation, and proposed a rule for seismic buckling of vessels based on the load and resistant factor design method. The proposed rule is expected to widen design window regarding seismic buckling and contribute to more reasonable design of vessels of fast reactors. However, there is still a room for more rational design. The proposed method deals with only seismic load, but in actuality, dead weight and internal pressure also exist. The existence of these loads contributes to reducing the buckling probability because axial compressive load decreases. In this study, the rule was expanded so that dead weight and internal pressure can be taken into account. Furthermore, the influences of dead weight and internal pressure to seismic buckling evaluation were discussed. As result, it was shown that approximately 10 to 20% of further rationalization of allowable seismic load could be achieved by considering dead weight and internal pressure in the evaluation. In addition, it was found that the previously proposed design rule, not considering dead weight and internal pressure, includes approximately 2 to 10 times margins in terms of seismic buckling probability.
format	article
author	Shigeru TAKAYA Naoto SASAKI
author_facet	Shigeru TAKAYA Naoto SASAKI
author_sort	Shigeru TAKAYA
title	Influence of dead weight and internal pressure to seismic buckling probability of fast reactor vessels
title_short	Influence of dead weight and internal pressure to seismic buckling probability of fast reactor vessels
title_full	Influence of dead weight and internal pressure to seismic buckling probability of fast reactor vessels
title_fullStr	Influence of dead weight and internal pressure to seismic buckling probability of fast reactor vessels
title_full_unstemmed	Influence of dead weight and internal pressure to seismic buckling probability of fast reactor vessels
title_sort	influence of dead weight and internal pressure to seismic buckling probability of fast reactor vessels
publisher	The Japan Society of Mechanical Engineers
publishDate	2020
url	https://doaj.org/article/5cf46bc69a634982adf1021e752b746f
work_keys_str_mv	AT shigerutakaya influenceofdeadweightandinternalpressuretoseismicbucklingprobabilityoffastreactorvessels AT naotosasaki influenceofdeadweightandinternalpressuretoseismicbucklingprobabilityoffastreactorvessels
_version_	1718407586113388544

Influence of dead weight and internal pressure to seismic buckling probability of fast reactor vessels

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