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2 edition of Ultrasonic inspection reliability for intergranular stress corrosion cracks found in the catalog.

Ultrasonic inspection reliability for intergranular stress corrosion cracks

P. G. Heasler

Ultrasonic inspection reliability for intergranular stress corrosion cracks

a round robin study of the effects of personnel, procedures, equipment and crack characteristics

by P. G. Heasler

  • 55 Want to read
  • 30 Currently reading

Published by Division of Engineering, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission in Washington, DC .
Written in English

    Subjects:
  • Fracture mechanics -- Measurement.

  • Edition Notes

    Distributed to depository libraries in microfiche.

    Other titlesRound robin study of the effects of personnel, procedures, equipment and crack characteristics.
    Statementprepared by P.G. Heasler ... [et al.].
    ContributionsU.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Engineering.
    The Physical Object
    Pagination1 v.
    ID Numbers
    Open LibraryOL15386399M

    The 18Mn5Cr rings are susceptible to stress corrosion cracking. These rings are much less vulnerable to stress corrosion cracking but can still be damaged by grid events that result in arcing damage between the ring and rotor body or amortisseur winding, or, from fretting damage resulting from relative motion between the ring and the mating shrink-fit surface as a result of frequent load. Stress corrosion cracking (SCC) is the growth of crack formation in a corrosive environment. It can lead to unexpected and sudden failure of normally ductile metal alloys subjected to a tensile stress, especially at elevated is highly chemically specific in that certain alloys are likely to undergo SCC only when exposed to a small number of chemical environments. The initiation and growth of intergranular stress-corrosion cracking (IGSCC) in the heat-affected zone of welds in stainless steel reactor piping has been a subject of concern to electric utilities for over ten years. This type of crack can be detected with ultrasonic shear waves during normal maintenance periods with a reliability of up to 80% [1]. Standard ultrasonic techniques usually yield reliable examination results. However, stainless steel cladding of the inside surface of the pipe adjacent to the weld, cladded to reduce the susceptibility of the wrought structure to intergranular stress corrosion cracking, has led to unexpected inspection .


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Ultrasonic inspection reliability for intergranular stress corrosion cracks by P. G. Heasler Download PDF EPUB FB2

@article{osti_, title = {Ultrasonic inspection reliability for intergranular stress corrosion cracks}, author = {Heasler, P G and Taylor, T T and Spanner, J C and Doctor, S R and Deffenbaugh, J D}, abstractNote = {A pipe inspection round robin entitled Mini-Round Robin'' was conducted at Pacific Northwest Laboratory from May through October Get this from a library.

Ultrasonic inspection reliability for intergranular stress corrosion cracks: a round robin study of the effects of personnel, procedures, equipment and crack characteristics. [P G Heasler; Pacific Northwest Laboratory.; U.S.

Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Engineering.;]. Improvement of plant reliability based on combining of prediction and inspection of crack growth due to intergranular stress corrosion cracking Author links open overlay panel Shunsuke Uchida a Yasuhiro Chimi a Shigeki Kasahara a Satoshi Hanawa a Hidetoshi Okada b Masanori Naitoh b Masayoshi Kojima c Hiroshige Kikura c Derek H.

Lister d. Intergranular stress-corrosion cracking (IGSCC), which has occurred in nuclear power plant piping systems, is detected ultrasonically. The principal problem is discrimination between the few acoustic reflections from flaws and the large number from geometry of the weld root and : CR Mikesell, LS Beller, JA Holm, S-N Liu.

adequate system reliability and component integrity. Recognize the factors used to establish a •Ultrasonic Testing – Only feasible test method for some locations Recognize the potential consequences of component failures caused by intergranular stress corrosion.

The second predicts the ultrasonic inspection response of a branched crack, which is an idealization of an intergranular stress corrosion crack (IGSCC). Achieving reliable inspection of nuclear reactor components requires the development and proper field implementation, of a variety of Ultrasonic inspection reliability for intergranular stress corrosion cracks book.

all of the flaws were detected. This was followed by an ultrasonic phased-array (PA) inspection of specimens containing service-induced intergranular stress corrosion cracks (IGSCC) at the Electric Power Research Institute (EPRI) NDE Center, in Charlotte, NC, which is the subject of this report.

Structural Reliability Improvement Using In-Service Inspection for Intergranular Stress Corrosion of Large Stainless Steel Piping.

By A. Guedri, Y. Djebbar, Moe. Khaleel and A. Zeghloul. Submitted: December 2nd Reviewed: April 1st Published: December 12th DOI: / Abstract. Ultrasonic detection and sizing of intergranular stress corrosion cracks (IGSCC) in nuclear reactor cooling systems is a difficult practical problem due to the complicated geometry of these defects and to the variety of other reflectors (e.

g., welds) which produce competing ultrasonic indications. Intergranular stress corrosion cracking (IGSCC) highly relates to the nucleation of cracks in the heat affected zone(HAZ) or cold-worked zone of austenitic stainless steels, especially in the cases of aged nuclear pressure reactor components[1].

In order to conduct an integrity assessment on existing cracks, threshold value of IGSCC is. A round Robin study of the effects of personnel, procedures, equipment and crack characteristics.

US Nuclear Regulatory Commission, Ultrasonic Inspection Reliability for Intergranular Stress Corrosion Cracks, Washington, Google Scholar. Jan 1st, AM. Application of Models for IGSCC Inspection. La Jolla, CA. Ultrasonic detection and sizing of intergranular stress corrosion cracks (IGSCC) in nuclear reactor cooling systems is a difficult practical problem due to the complicated geometry of these defects and to the variety of other reflectors (e.

g., welds) which produce competing ultrasonic indications. Ultrasonic inspection reliability for intergranular stress corrosion cracks. Article.

procedures and equipment that are employed to find intergranular stress corrosion cracks in nuclear power. applied to welds with deep cracks. Also, the reliability of post -MSIP NDE is important for determining performing ultrasonic testing (UT) modeling analyses when designing inspection parameters, using IGSCC intergranular stress corrosion cracking.

IHD incremental hole drilling. where Y is a geometric factor, σ is the applied stress and a is the crack length. In air, fracture is expected when K I exceeds a critical value, the fracture toughness, K Ic. Figure provides typical stress corrosion crack velocity data [].The threshold for SCC, K ISCC, is the stress intensity factor above which occurs the first measurable crack extension; the growth rates are.

Development of cracks in austenitic steel induced by intergranular stress corrosion is essential factor reducing reliability of pipes used in nuclear power plants. Propagation of ultrasonic waves in such materials is accompanied by strong backscattering, which causes so called structural noise (1,4).

methods to control the intergranular stress corrosion cracking susceptibility of BWR piping. For piping that does not fully comply with the material selection, testing, and processing guideline combinations of this document, varying degrees of augmented inservice inspection are recommended.

This. of Ultrasonic Techniques for Stress Corrosion Cracking’ with the objective of improving the understanding of how various ultrasonic inspection techniques would perform at sizing SCC. To do so, Applus RTD utilized a finite-difference based simulation technique in-order to understand how sound interacts with the cracks as found in a stress.

Stress Corrosion Cracking (SCC) Cracking induced from the combined influence of tensile stress, susceptible steel and a corrosive environment. Diffraction When an ultrasound wave is incident at a linear discontinuity such as a crack, diffraction takes place at its extremities (i.e.

crack tip). The study of this ECNDT - Tu 1. The part-through initial stress corrosion cracks considered can grow and become unstable part-through cracks or stable or unstable through-wall cracks. J.D. DeffenbaughAn evaluation of human reliability in ultrasonic in-service inspection for intergranular stress corrosion cracking through round robin testing.

Materials Evaluation, 47 ( Compared with the original specimen, width of the stress corrosion cracks, roughness of the scale/steel interface and corrosion rate decreased after USRP.

The effects of grain size and surface roughness as well as the stress field on stress corrosion cracking susceptibility of X80 pipeline steel treated by USRP were investigated. crack initiation and growth by intergranular stress corrosion cracking (IGSCC) mainly affects the nickel-based weld material.

For Cr-Ni-steels, not only the weld itself is susceptible to IGSCC, but also the heat-affected zone (HAZ). The detection and evaluation of such cracks using ultrasonic testing is aggravated due to the crack properties.

Stress Corrosion Crack Ultrasonic Inspection Artificial Intelligence Approach Reflector Indication Break Crack These keywords were added by machine and not by the authors.

This process is experimental and the keywords may be updated as the learning algorithm improves. Intergranular corrosion induced by environmental stresses is termed stress corrosion cracking. Inter granular corrosion can be detected by ultrasonic and eddy current methods.

Sensitization effect. Sensitization refers to the precipitation of carbides at grain boundaries in a stainless steel or alloy, causing the steel or alloy to be. Simonen, F. A.,“An Evaluation of the Impact of Inservice Inspection on Stress Corrosion Cracking of BWR Piping,” Codes and Standards and Applications for Design and Analysis of Pressure Vessel and Piping Components, ASME PVP-Vol.NDE-Vol.

7, pp. – The purpose of the MRR was to quantify intergranular stress-corrosion crack (IGSCC) detection and sizing capabilities of in-service inspection (ISI) technicians who had recently passed the.

Diaz, Aaron A., Anderson, Michael T., Cinson, Anthony D., Crawford, Susan L., and Cumblidge, Stephen E. "An Ultrasonic Phased Array Evaluation of Intergranular Stress Corrosion Crack (IGSCC) Detection in Austenitic Stainless Steel Piping Welds." Proceedings of the ASME Pressure Vessels and Piping Division/K-PVP Conference.

conference: an ultrasonic phased array evaluation of intergranular stress corrosion crack (igscc) detection in austenitic stainless steel piping welds. an ultrasonic phased array evaluation of intergranular stress corrosion crack (igscc) detection in austenitic stainless steel piping welds.

Stephen E. Cumblidge's 54 research works with 68 citations and reads, including: Overview of the program to assess the reliability of emerging nondestructive techniques open testing and study. Abstract. This chapter describes how ultrasonic testing came to be a viable method for evaluating intergranular stress-corrosion cracking (SCC) in large-diamete.

Procedures were developed for in-service ultrasonic inspection for detection and sizing of stress corrosion cracking (SCC) in ferritic steel line pipe. Member Report / Formal training programs for ultrasonic inspection of boiling water reactor (BWR) piping for intergranular stress-corrosion cracking (IGSCC) have been provided by the EPRI NDE Center since Separate courses are available for detection and sizing of IGSCC in unrepaired piping.

Cracks generate under the influence of corrosive environment and exciting forces. It is mainly shown as intergranular stress corrosion and intergranular fracture at fatigue source and fatigue propagation with corrosion characteristics at crack growth regions.

Therefore, many factors will influence the. Structural Reliability Improvement Using In-Service Inspection for Intergranular Stress Corrosion of Large Stainless Steel Piping 2.

Methodology Overview of the PRAISE code The present section describes probabilistic fracture mechanics calculations that were performed for selected components using the PRAISE computer code.

This paper shows major advantages of ultrasonic inline inspection technologies for metal loss/corrosion and crack detection with Evo Series tools. Metal Loss/Corrosion Piezo-electric transducers mounted on a pigging tool - in most cases within a special sensor carrier - are used for measuring the wall thickness of pipelines.

Suitable countermeasures can be applied to keep plant reliability by following these procedures. In this paper, procedures for the combination of prediction and inspection have been demonstrated for intergranular stress corrosion cracking (IGSCC) based on uncertainty propagation evaluation.

Combination of prediction and inspection. The second approach is based on a design-of-experiments (DEX) of eight field inspection exercises for finding the length of a subsurface crack in a pressure vessel head using ultrasonic testing (UT), where five factors (operator’s service experience, UT machine age, cable length, probe angle, and plastic shim thickness), were chosen to.

The Mini-Round Robin (MRR) measured the intergranular stress corrosion (GSC) crack detection and sizing capabilities of inservice inspection (ISI) inspectors that had passed the requirements of IEB and the Electric Power Research Institute (EPRI) sizing training course.

User Tools. Cart. Sign In. Intergranular Corrosion (IC) and Exfoliation Corrosion Selective Corrosion (SC) (Selective Leaching) which comprises visual inspection, radiography, ultrasonic testing, eddy current technique, magnetic particle inspection, the use of liquid penetrant, the electric Initial cracks caused by stress corrosion or corrosion fatigue.

The through-wall intergranular stress corrosion cracks (IGSCC) that were missed during a routine ultrasonic examination of piping welds at the Nine Mile Point Nuclear Plant in had a major impact on the nuclear power industry.

The through-wall cracks were .Immersion and hydrogen evolution testing. To reflect the severity of corrosion attack, the corrosion morphologies of as-forged and T4 samples immersed in wt.% NaCl solution were observed, as shown in Fig.

can be seen that for the as-forged sample, several localised corrosion areas with a diameter of ~50 μm and severe corrosion grooves occurred after immersion for 6 h (Fig.

2(a.Mitigating Primary Water Stress Corrosion Cracking at Nickel Alloy Butt Welds in Piping Systems IGSCC intergranular stress corrosion cracking.

IHD incremental hole drilling. ISI in-service inspection. UT ultrasonic testing. WOL weld overlay.