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Analytic study of the steel liner near the equipment hatch in a 1 : 4 scale containment model

Anderson, Patrick LU (2008) In Nuclear Engineering and Design 238(7). p.1641-1650
Abstract
A containment scale-model test, performed at Sandia National Laboratories, was loaded by overpressurization and the first leak was concluded to be caused by tears in the steel liner found near the equipment hatch. These tears were located in the vicinity of the vertical fold in between the general curved part and the embossment (vertical bend line). A 3D finite element analysis of the region near the equipment hatch, shows that high localized strains will develop in the vicinity of the bend line. It is shown that the liner separates from the concrete wall near the bend line when the containment expands. The tensioned liner will be in contact with the surface of the concrete wall in general, but near the vertical bend line the liner tends... (More)
A containment scale-model test, performed at Sandia National Laboratories, was loaded by overpressurization and the first leak was concluded to be caused by tears in the steel liner found near the equipment hatch. These tears were located in the vicinity of the vertical fold in between the general curved part and the embossment (vertical bend line). A 3D finite element analysis of the region near the equipment hatch, shows that high localized strains will develop in the vicinity of the bend line. It is shown that the liner separates from the concrete wall near the bend line when the containment expands. The tensioned liner will be in contact with the surface of the concrete wall in general, but near the vertical bend line the liner tends to be straightened out. This flexural behaviour cause high strains in the weld located in the bend line. The actual peak strain level is depending on the detailed geometry in the bend line and the failure strain level of a welded biaxial stressed zone is difficult to define. However, the analysis presented in this paper shows that the flexural behaviour in the bend line most likely contributed to the liner tears found in the scale-model test. A general conclusion from the study presented in this paper is that, the non-linear plastic behaviour of the liner is very sensitive to the detailed design and the interaction between the liner and the concrete. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nuclear Engineering and Design
volume
238
issue
7
pages
1641 - 1650
publisher
Elsevier
external identifiers
  • wos:000256951000016
  • scopus:43049158141
ISSN
1872-759X
DOI
10.1016/j.nucengdes.2007.12.013
language
English
LU publication?
yes
id
462c5bad-37a0-48af-9455-bffdfed22f2c (old id 1190557)
date added to LUP
2008-09-08 10:06:07
date last changed
2017-08-06 03:49:55
@article{462c5bad-37a0-48af-9455-bffdfed22f2c,
  abstract     = {A containment scale-model test, performed at Sandia National Laboratories, was loaded by overpressurization and the first leak was concluded to be caused by tears in the steel liner found near the equipment hatch. These tears were located in the vicinity of the vertical fold in between the general curved part and the embossment (vertical bend line). A 3D finite element analysis of the region near the equipment hatch, shows that high localized strains will develop in the vicinity of the bend line. It is shown that the liner separates from the concrete wall near the bend line when the containment expands. The tensioned liner will be in contact with the surface of the concrete wall in general, but near the vertical bend line the liner tends to be straightened out. This flexural behaviour cause high strains in the weld located in the bend line. The actual peak strain level is depending on the detailed geometry in the bend line and the failure strain level of a welded biaxial stressed zone is difficult to define. However, the analysis presented in this paper shows that the flexural behaviour in the bend line most likely contributed to the liner tears found in the scale-model test. A general conclusion from the study presented in this paper is that, the non-linear plastic behaviour of the liner is very sensitive to the detailed design and the interaction between the liner and the concrete.},
  author       = {Anderson, Patrick},
  issn         = {1872-759X},
  language     = {eng},
  number       = {7},
  pages        = {1641--1650},
  publisher    = {Elsevier},
  series       = {Nuclear Engineering and Design},
  title        = {Analytic study of the steel liner near the equipment hatch in a 1 : 4 scale containment model},
  url          = {http://dx.doi.org/10.1016/j.nucengdes.2007.12.013},
  volume       = {238},
  year         = {2008},
}