Leak-before-break assessment of CANDU pressure tube considering leak detection capability

Park, Youn-Won; Chung, Yeon-Ki

doi:10.1016/s0029-5493(99)00142-9

Cited by 7 publications

(2 citation statements)

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“…Two reports published by the International Atomic Energy Agency (IAEA) in 1993 and 1994 present the application of LBB in different countries [5], [21]. Other publications also provide examples of LBB applications or developments in other countries, for example France [22], [23], Belgium [24], USA [17], Canada [25], [26], Korea [27], India [28] or Czech Republic [29] where the following procedures were used with slight modifications.…”

Section: Nuclear Industrymentioning

confidence: 99%

Leak-before-break: Global perspectives and procedures

Bourga

Moore

Janin

et al. 2015

International Journal of Pressure Vessels and Piping

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Structural integrity of components containing fluids is critical for economic, environmental and safety issues. Any risk of catastrophic failure, in the form of either brittle or ductile manner, is not acceptable across the industries. Consequently, many efforts have been invested in the structural integrity aspect to improve the assessment methodologies. One of the ways to aid the decision whether or not to live with the defect is through the demonstration of Leak-Before-Break (LBB). LBB which is a well-established practice in the nuclear industry, albeit as a defence-in-depth argument or to justify the elimination of pipe whip restraints, also finds its applicability in other industries. A review of the available procedures, their associated limitations and the research carried out in the last thirty years is presented in this paper. Application of this concept within non-nuclear industries is also discussed. Leak- AbstractStructural integrity of components containing fluids is critical for economic, environmental and safety issues. Any risk of catastrophic failure, in the form of either brittle or ductile manner, is not acceptable across the industries. Consequently, many efforts have been invested in the structural integrity aspect to improve the assessment methodologies. One of the ways to aid the decision whether or not to live with the defect is through the demonstration of Leak-Before-Break (LBB). LBB which is a well-established practice in the nuclear industry, albeit as a defence-in-depth argument or to justify the elimination of pipe whip restraints, also finds its applicability in other industries. A review of the available procedures, their associated limitations and the research carried out in the last thirty years is presented in this paper. Application of this concept within non-nuclear industries is also discussed.

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Section: Nuclear Industrymentioning

confidence: 99%

Leak-before-break: Global perspectives and procedures

Bourga

Moore

Janin

et al. 2015

International Journal of Pressure Vessels and Piping

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“…For nuclear vessels and piping, delayed hydride cracking (DHC) is believed to be the major potential threat to structure integrity 37,39 and the contribution of DHC to crack growth is normally much more dominant comparing to fatigue crack growth. Therefore, only DHC is taken as the underlying failure mode for the multicrack behaviour simulation in the present paper.…”

Section: Leak Simulation In Multiple Crack Situationsmentioning

confidence: 99%

A probabilistic simulation of fluid leakage in multiple cracks situation

Xie

2002

Fatigue Fract Eng Mat Struct

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In pressure vessels and piping the leak‐before‐break (LBB) assessment method is employed to avoid any catastrophic failure prior to a detectable leakage. One of the most important parameter, the leak rate, is investigated in the present paper by means of the Monte Carlo method. A brief review is carried out with emphasis on aspects such as crack growth, crack size with detectable leakage, crack opening area and leak rate. Issues concerning the property and behaviour of multiple cracks are also covered along with a review of the characteristics of leak rate through distributed multiple cracks using a statistical simulation method. The simulation results show that the effect of multiple cracks is quite significant to the LBB concept. Both the relationship between leak rate and crack length (or time) and the statistical characteristics of the leak rate are considerably different for different initial crack conditions.

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