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Research Papers: Codes and Standards

Load and Resistance Factor Design (LRFD) of Nuclear Straight Pipes for Loads That Cause Primary Stress

[+] Author and Article Information
Kleio Avrithi1

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

Bilal M. Ayyub

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

1

Corresponding author.

J. Pressure Vessel Technol 132(2), 021101 (Mar 31, 2010) (14 pages) doi:10.1115/1.4000976 History: Received November 15, 2009; Revised December 28, 2009; Published March 31, 2010; Online March 31, 2010

Class 2 and 3 nuclear piping is designed according to the allowable stress design (ASD) method used in the ASME Boiler and Pressure Vessel (B&PV) code, Sec. III, Division 1, NC and ND-3600 according to which safety factors applied to the strength of steel (resistance) provide acceptable safety margins for the piping design. This paper describes the development of design equations according to the load and resistance factor design (LRFD) method for loads that cause primary stress such as sustained weight, internal pressure, and earthquake for different levels of piping operation. The LRFD method differs from the ASD since multiple factors, applied separately to each load and the strength of steel, provide safety margins that correspond to a known and acceptable probability of failure for the piping. Load combinations are provided, statistical properties for the variables under consideration are presented and the partial safety factors are moreover illustrated for different values of the target reliability index.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Piping stresses and loads

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Figure 2

Failure modes for piping and their cause

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Figure 3

Histogram for the yield strength of stainless austenitic steel at room temperature (10)

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Figure 4

Histogram for the ultimate strength of stainless austenitic steel at room temperature (10)

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Figure 5

Reliability density functions of resistance (R) and load (L) and failure probability (17)

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Figure 6

Variation with temperature of the recommended nominal resistance factor for carbon steel and COV for earthquake loading for performance function g4

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Figure 7

Variation with temperature of the recommended nominal resistance factor for stainless steel and COV for earthquake loading for performance function g4

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