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Research Papers: Design and Analysis

A Reliability-Based Approach for Low-Cycle Fatigue Design of Class 2 and 3 Nuclear Piping

[+] Author and Article Information
Kleio Avrithi1

Department of Civil and Environmental Engineering, University of Maryland, College Park, MD 20742clioavr@yahoo.com

Bilal M. Ayyub

Center of Technology and Systems Management, University of Maryland, College Park, MD 20742; Department of Civil and Environmental Engineering, University of Maryland, College Park, MD 20742ba@umd.edu

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J. Pressure Vessel Technol 132(5), 051202 (Aug 17, 2010) (6 pages) doi:10.1115/1.4001269 History: Received November 15, 2009; Revised January 31, 2010; Published August 17, 2010; Online August 17, 2010

This paper presents a reliability-based low-cycle fatigue design approach for class 2 and 3 nuclear pipes. Initially, the methodology and background for the design of the pipes according to the ASME Boiler and Pressure Vessel (B&PV) Code is presented. Then a probabilistic design methodology based on the ASME B&PV Code and focused on straight pipes with butt-welds is presented. The method ensures an acceptable reliability level for piping by keeping the failure probability within some upper threshold and accounting for the uncertainties of the design variables. In opposition, the current design may result in diverse and often unknown probabilities of failure for piping. A computational example illustrates the developed method.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Allowable fatigue stress range SA and fatigue test stress range versus cycles to failure for girth butt-welded class 2 and 3 straight pipes

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Figure 2

Probability density function (PDF) for the bending stress ranges (14)

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Figure 3

Reliability index in a reduced coordinates performance space

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Figure 4

Flowchart for the direct reliability design for cyclic bending moments loading

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