Technical Briefs

A Reliability-Based Expression of ASME B&PV Code Equation (11) for Class 2 and 3 Nuclear Pipes

[+] Author and Article Information
Kleio Avrithi1

 AREVA NP Inc., 3315 Old Forest Road, OF-34 Lynchburg, VA 24501clioavr@yahoo.com

Bilal M. Ayyub

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


Corresponding author.

J. Pressure Vessel Technol 132(5), 054502 (Sep 27, 2010) (4 pages) doi:10.1115/1.4002460 History: Received October 17, 2009; Revised August 22, 2010; Published September 27, 2010; Online September 27, 2010

Previous research provided a reliability-based approach for the low-cycle fatigue design of Class 2 and 3 nuclear pipes. Reliability-based equations incorporate a threshold for the piping reliability and yield a safe and uniform design that moreover can be associated with the design risk. This brief discusses a direct reliability method to be used for Eq. (11) in Subparagraphs NC and ND-3653.2 of the ASME B&PV Code for Class 2 and 3 pipes, respectively. A computational example illustrates the developed methodology.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

Performance space in reduced coordinates for a linear performance function showing the reliability index, β

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Figure 2

PDF for thermal expansion stress ranges (1)

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Figure 3

Flowcharts of the direct reliability-based design for the combination of thermal expansion stresses with primary stresses




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