Example Analysis for Environmental Fatigue Crack Growth in Austenitic Stainless Steel Piping Using Code Case N-809

Bamford, W. H.; Cipolla, Russell C.; Udyawar, Anees; Glunt, N. L.

doi:10.1115/pvp2015-45967

Volume 1A: Codes and Standards 2015

DOI: 10.1115/pvp2015-45967

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Example Analysis for Environmental Fatigue Crack Growth in Austenitic Stainless Steel Piping Using Code Case N-809

W. H. Bamford

Russell C. Cipolla

Anees Udyawar

et al.

Abstract: Reference fatigue crack growth (da/dN) curves for pressurized water reactor (PWR) environments have been proposed for ASME Section XI flaw evaluation applications in Code Case N-809. The reference curves are dependent on temperature, loading rate, mean stress, and cyclic stress range which are all contained in the da/dN model. This paper presents the application of N-809 in a fatigue crack growth analysis for a large diameter austenitic pipe in a PWR Reactor Coolant System main loop using the current analytica… Show more

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Section XI Flaw Acceptance Criteria and Evaluation Using Code Procedures

Cipolla¹

2020

Online Companion Guide to the ASME Boiler &Amp; Pressure Vessel Codes

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For the sixth edition, this chapter has been updated with revised Code requirements and Code Cases from the 2017 Code and 2019 Code Editions. The important areas of revised requirements and procedures include flaw proximity rules in IWA-3300, change in the yield strength limits from 50 ksi to 90 ksi for selected grades of SA-508 and SA-533, addition of stress intensity factor equations for circumferential OD surface flaws in Appendix A, A-3000, revised procedures for pipe flaw evaluation in Appendix C, C-4000 and C-5300, and an updated glossary terminology/definitions. Several new and revised Code Cases are also discussed to include N-513-5 (temporary acceptance of flaws in moderate energy piping systems), N-705-1 (temporary acceptance of flaws in moderate energy vessels and tanks), N-806-1 (evaluation of wall loss in buried pipe), N-848-1 (proximity rules for quasi-laminar flaws), N-869 (extension of N-513 to higher pressures for Class 2 and 3 piping systems), N-877 (characterization of multiple subsurface radially oriented planar flaws), N-889 (new reference curves for irradiated-assisted stress corrosion cracking growth for austenitic stainless steels), N-899 (weld residual stress reference curves for dissimilar metal welds), and N-890 (materials exempted from Appendix G, G-2110(b) requirements). It is important to note that additional proposal changes are being developed by the committees, some of which are discussed in 30.11. History Arthur F. Deardorff was the original author of this chapter that was updated by Mr. Deardorff in the second edition. For the third through fifth editions, Russell C. Cipolla revised the entire chapter although retaining certain portions of the previous text, equations, tables, and figures. For the current online edition, Mr. Cipolla has updated using 2017 and 2019 Editions, and additional information as appropriate.

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Section XI Flaw Acceptance Criteria and Evaluation Using Code Procedures

Cipolla¹

2020

Online Companion Guide to the ASME Boiler &Amp; Pressure Vessel Codes

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Fatigue Crack Growth, Fatigue, and Stress Corrosion Crack Growth: Section XI Evaluation

Bamford¹

2020

Online Companion Guide to the ASME Boiler &Amp; Pressure Vessel Codes

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Fatigue has often been described as the most common cause of failure in engineering structures, and designers of pressure vessels and piping have incorporated fatigue considerations into design requirements since the first edition of Section III in 1963. The development of this technology and its application in Section III are discussed in Chapter 39 of the third edition of this publication. Its application in Section XI is discussed in Section 32.3 of this chapter. With the advancement of the state of the art, the ability to recognize how the growth and size of a crack can lead to failure has been enhanced. This technology has been a key aspect of the Section XI flaw evaluation procedures since the 1974 edition was published and will be discussed thoroughly herein. Further advancements in the state-of-the-art in fracture evaluation resulted in the introduction of models for stress corrosion cracking into Section XI in 2001, and since that time additional models have been added and more are planned. This addition gives Section XI flaw evaluations a complete treatment of all the potential modes of cracking that can occur in components, and details will be provided in Section 32.2. Since additional crack growth data, for both fatigue and stress corrosion cracking, is periodically made available on a regular basis from additional research testing, the models contained in Section XI are regularly reviewed and updated to ensure their applicability, accuracy, and reflection of the latest known material behaviors. This improved knowledge may lead to more conservative models for crack growth over time. To accommodate such situations, Section XI has adopted an approach to conservatively account for potential increases in crack growth predictions with augmented examinations. The rules of IWB-3600 require that augmented (additional) examinations must be performed at an accelerated pace for situations where a flaw indication was accepted by analytical evaluation. This rule also protects against NDE uncertainties at the location of interest. The nomenclature used here will be identical to that used in Section XI; any nomenclature that is not present in Section XI will be explained as it appears. This chapter has been updated using the 2019 Code edition. History Warren H. Bamford is the original author of this chapter and has since revised it for all of the subsequent editions including the current online edition.

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Example Analysis for Environmental Fatigue Crack Growth in Austenitic Stainless Steel Piping Using Code Case N-809

Cited by 2 publications

References 0 publications

Section XI Flaw Acceptance Criteria and Evaluation Using Code Procedures

Section XI Flaw Acceptance Criteria and Evaluation Using Code Procedures

Fatigue Crack Growth, Fatigue, and Stress Corrosion Crack Growth: Section XI Evaluation

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