Ontario hydro's leak-before-break approach to Darlington NGS heat transport system piping

Nathwani, Jatin; Stebbing, J.D.

doi:10.1016/0308-0161(90)90096-z

Cited by 5 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The most recent methodology developed to prevent catastrophic failure is centred on the concept of leak‐before‐break (LBB). This concept, which demonstrates through fracture mechanics that there is a negligible chance of catastrophic failure prior to leakage, has been widely used in nuclear power plants for the design of a primary heat transport system (PHTS) 1–4 …”

Section: Introductionmentioning

confidence: 99%

A probabilistic simulation of fluid leakage in multiple cracks situation

Xie

2002

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

A probabilistic simulation of fluid leakage in multiple cracks situation

Xie

2002

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…The LBB assessment was ®rst introduced by large power industries such as Ontario Hydro [1] in an attempt to provide con®dence in the assessment of piping integrity without the presence of design features for pipe-whip restraints and jet impingement shields. In this case, the design of the LBB assessment focused on the driving loads acting on the piping system.…”

Section: Introductionmentioning

confidence: 99%

Identification of fluid flow regimes in narrow cracks

Bagshaw

Beck

Yates

2000

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

The problem of fluid seepage through the cracked walls of pressure vessels has been examined. A simplified two-dimensional computational fluid dynamics (CFD) model of water passing through a narrow crack has been constructed and the results compared with published data. The CFD modelling process was validated by experimental work on two geometrically identical idealized crack bodies. The flowrate of air through the crack as a function of opening displacement was measured using the smaller apparatus, and the corresponding flow patterns were observed using smoke particles in the larger air flow apparatus. Four distinct flow regimes have been identified when the opening displacement of the crack is less than 3 times the surface roughness of the crack faces.

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

Ontario hydro's leak-before-break approach to Darlington NGS heat transport system piping

Cited by 5 publications

References 4 publications

A probabilistic simulation of fluid leakage in multiple cracks situation

A probabilistic simulation of fluid leakage in multiple cracks situation

Identification of fluid flow regimes in narrow cracks

Leak-before-break: Global perspectives and procedures

Contact Info

Product

Resources

About