Failure Mechanisms in Nuclear Power Plant Piping Systems

Bush, S.H.

doi:10.1115/1.2929244

Cited by 25 publications

(13 citation statements)

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“…The decrease of error of the stress value for increasingly smaller outer diameter pipe was a proportional relationship between the stress value and the outer diameter as shown in Eq. (3). For the 3B pipe in which the outer diameter was 89.1 mm, the error values were 10 MPa in the 38-mm measurement interval and 2.5 MPa in the 76-mm measurement interval.…”

Section: S/n Ratio and Measurement Intervalmentioning

confidence: 91%

“…A serious problem in nuclear power plants is the occurrence of fatigue failures in small-bore piping systems that arise from vibration sources such as pumps during plant operation [1][2][3][4][5][6][7]. Large amounts of piping less than 3B in the normal pipe size (89.1 mm in the outer diameter) such as drain piping, vent piping and instrumentation piping are installed in the nuclear power plants and piping fatigue failures induced by mechanical vibration and fluid vibration have been frequently reported.…”

Section: Introductionmentioning

confidence: 99%

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Experimental validation of non-contacting measurement method using LED-optical displacement sensors for vibration stress of small-bore piping

et al. 2015

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Section: S/n Ratio and Measurement Intervalmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Experimental validation of non-contacting measurement method using LED-optical displacement sensors for vibration stress of small-bore piping

et al. 2015

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“…A significant example is circumferential welds in large components for nuclear power plants, where welding residual stresses are a major concern [33]. Some approaches to solving this category of problems are discussed next.…”

Section: Examples Of Measurement Challengesmentioning

confidence: 99%

Beyond the Streetlight Effect: A United Future for Relaxation and Diffraction Methods for Residual Stress Measurement

Prime

Steinzig

2014

AMR

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Abstract. Residual stress measurement techniques can be categorized as either relaxation or diffraction methods. Practitioners often advocate a particular category and sometimes a specific technique (hole drilling, contour, XRD, neutron, etc) based on their experience or capability rather than using the best technique for the particular application. This paper considers some of the implications from applying this "drunkard's search" or "streetlight" approach by examining examples where the critical stress could be hidden from both relaxation and diffraction measurements. A better approach to planning residual stress measurements would begin with a detailed consideration of why the stresses should be measured and how the results will be used. Only then can the most appropriate measurement plan be developed. Since a single measurement technique cannot reveal the full state of stress, especially in challenging parts, the use of multiple measurement types often provides the most useful information to customers.

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“…To remain in service, such defected components must be demonstrated to be safe against rupture. Axial residual stresses are a main driver for the growth of circumferential cracks and must be known for crack growth and leak-before-break analyses [3][4][5]. Measurement of those stresses is difficult.…”

Section: Introductionmentioning

confidence: 99%

Measuring Inaccessible Residual Stresses Using Multiple Methods and Superposition

et al. 2010

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The traditional contour method maps a single component of residual stress by cutting a body carefully in two and measuring the contour of the cut surface. The cut also exposes previously inaccessible regions of the body to residual stress measurement using a variety of other techniques, but the stresses have been changed by the relaxation after cutting. In this paper, it is shown that superposition of stresses measured post-cutting with results from the contour method analysis can determine the original (pre-cut) residual stresses. The general superposition theory using Bueckner's principle is developed and limitations are discussed. The procedure is experimentally demonstrated by determining the triaxial residual stress state on a cross section plane. The 2024-T351 aluminum alloy test specimen was a disk plastically indented to produce multiaxial residual stresses. After cutting the disk in half, the stresses on the cut surface of one half were determined with X-ray diffraction and with hole drilling on the other half. To determine the original residual stresses, the measured surface stresses were superimposed with the change stress calculated by the contour method. Within uncertainty, the results agreed with neutron diffraction measurements taken on an uncut disk.

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Failure Mechanisms in Nuclear Power Plant Piping Systems

Cited by 25 publications

References 0 publications

Experimental validation of non-contacting measurement method using LED-optical displacement sensors for vibration stress of small-bore piping

Experimental validation of non-contacting measurement method using LED-optical displacement sensors for vibration stress of small-bore piping

Beyond the Streetlight Effect: A United Future for Relaxation and Diffraction Methods for Residual Stress Measurement

Measuring Inaccessible Residual Stresses Using Multiple Methods and Superposition

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