Integrated probabilistic assessment for DHC initiation, growth and leak-before-break of PHWR pressure tubes

Oh, Young-Jin; Chang, Yoon‐Suk

doi:10.1016/j.nucengdes.2014.04.034

Cited by 6 publications

(2 citation statements)

References 6 publications

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“…Much of the work to date has focussed on the development of tools and techniques which support the analytical evaluation of flaws which have not met the initial acceptable criteria by examination. For example, Oh and Chang (2014) describes an integrated probabilistic approach to the assessment of these types of flaw, but focusses on those which have not met the initial acceptable criteria. Similarly Cho et al (2016) provides an overview of recent work in the prediction of DHC from in-service inspection flaws, but also tackles those flaws already identified as not having met the acceptable criteria by examination.…”

Section: Key Related Workmentioning

confidence: 99%

Automated sizing and classification of defects in CANDU pressure tubes

Lardner¹,

West²,

Dobie³

et al. 2017

Nuclear Engineering and Design

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Pressure tubes within CANDU reactors are subject to frequent ultrasonic non-destructive examination to identify and characterize any defects that pose a risk of initiating Delayed Hydride Cracking (DHC), a well-known problem that occurs in zirconium components that are subject to high mechanical and thermal stresses. The analysis of the ultrasonic data gathered from the pressure tubes is often a long and repetitive process on the critical path to the restart of the reactor. Motivations for developing an automated system include saving time on the critical path, minimising human subjectivity from the process and increasing repeatability of measurements. An automated system providing decision support to analysts also reduces the risk of operator fatigue by minimising time spent processing routine defects. This paper describes a novel system for the automated analysis of CANDU pressure tube inspection data. The system automates the entire initial examination process including the complex decision-making procedures by implementing an expert system with an associated rule-base. Results from this system are detailed, illustrating the location and characterisation of defects and key features within the pressure tube with a high degree of accuracy while increasing repeatability through the removal of subjectivity in measurements.

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Section: Key Related Workmentioning

confidence: 99%

Automated sizing and classification of defects in CANDU pressure tubes

Lardner¹,

West²,

Dobie³

et al. 2017

Nuclear Engineering and Design

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show abstract

“…An example of the application of a probabilistic assessment in accordance with the R6 procedure using Monte Carlo method is provided in [64]. Application of LBB in CANDU (CANada Deuterium Uranium) reactors is given in [65] or more recently in [66] to assess delayed hydride cracking.…”

Section: Past and Future Researchmentioning

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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Application of finite element method to effect of weld overlay residual stress on probability of piping failure

Liu

Wang

2022

International Journal of Pressure Vessels and Piping

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Integrated probabilistic assessment for DHC initiation, growth and leak-before-break of PHWR pressure tubes

Cited by 6 publications

References 6 publications

Automated sizing and classification of defects in CANDU pressure tubes

Automated sizing and classification of defects in CANDU pressure tubes

Leak-before-break: Global perspectives and procedures

Application of finite element method to effect of weld overlay residual stress on probability of piping failure

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