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Research Papers: Design and Analysis

A Reliability-Based Approach for the Design of Nuclear Piping for Internal Pressure

[+] Author and Article Information
Kleio Avrithi

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

Bilal M. Ayyub1

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

1

Corresponding author.

J. Pressure Vessel Technol 131(4), 041201 (May 15, 2009) (10 pages) doi:10.1115/1.3122017 History: Received December 02, 2007; Revised November 16, 2008; Published May 15, 2009

Nuclear pipes are designed to withstand primary membrane stresses generated by internal pressure according to the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel (B&PV) Code, Section III, Parts NB-3641, NC-3641, and ND-3641, which uses the allowable stress design (ASD) method. This paper presents limit states and equations for the design of nuclear pipes for internal pressure based on the load and resistance factor design (LRFD) method. The LRFD method is shown and explained to be more consistent than the ASD method. The paper presents the procedure for the derivation of the partial safety factors. Moreover, these factors are evaluated, example calculations are provided, and comparisons with the present design are made.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Relationships among nominal (LN,RN), mean (μL,μR), and factored values (γLN,φRN) for the load and resistance

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Figure 2

Performance space in reduced coordinates for a linear performance function showing the design point x′∗ and the shortest distance from the origin, namely, the reliability index β

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Figure 3

(a) Partial safety factors φy for the mean resistance, γP for the mean pressure, and γM for the mean model uncertainty variable versus β for design and service limit A, and stainless steel; (b) partial safety factors φy for the mean resistance, γP for the mean pressure, and γM for the mean model uncertainty variable versus β for design and service limit A and carbon steel

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Figure 4

(a) Partial safety factors φy for the mean resistance, γP for the mean pressure, and γM for the mean model uncertainty variable versus β for service limit B and stainless steel; (b) partial safety factors φy for the mean resistance, γP for the mean pressure, and γM for the mean model uncertainty variable versus β for service limit B and carbon steel

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Figure 5

Partial safety factors φu for the mean resistance, γP for the mean pressure, and γM for the mean model uncertainty variable versus β for service limit C and both stainless and carbon steel

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Figure 6

Partial safety factors φfu for the mean resistance, γP for the mean pressure, and γM for the mean model uncertainty variable versus β for service limit D and both carbon and stainless steel

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Figure 7

Adjusted nominal resistance factor for the internal pressure having normal and lognormal distribution for service limit A and stainless steel

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Figure 8

Adjusted nominal resistance factor for the internal pressure having normal and lognormal distribution for service limit A and carbon steel

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