There are several sources of uncertainties which need to be considered in a probabilistic reliability and lifetime assessment of safety-relevant components. In addition to the probabilistic distribution of material properties, the size and properties of flaws present in a component contribute to uncertainties in the lifetime analysis. In a current reactor safety research project, a methodology for a probabilistic fracture mechanics assessment of reliability for components with austenitic and dissimilar metal welds will be developed using the combined results from statistical evaluation of material properties and ultrasonic inspection (UT). Dissimilar metal welds present a particular challenge for ultrasonic testing due to the effects of the material anisotropy on ultrasonic propagation and scattering. Evaluation of inspection results is typically done using image-based techniques. As there is no simple relationship between UT response and flaw size, criteria for image evaluation and flaw sizing have to be defined taking into account the influence of various factors such as material and flaw properties on the UT response. In this paper, we present results from a study of the influence of grain structure on the ultrasonic inspection results and discuss the challenges of extracting data for probability of detection (POD) analyses.
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ASME 2017 Pressure Vessels and Piping Conference
July 16–20, 2017
Waikoloa, Hawaii, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5798-4
PROCEEDINGS PAPER
Ultrasonic Inspection of Dissimilar Metal Welds for Probabilistic Reliability Assessment of Pipe Welds
Sandra Dugan,
Sandra Dugan
University of Stuttgart, Stuttgart, Germany
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Anne Jüngert
Anne Jüngert
University of Stuttgart, Stuttgart, Germany
Search for other works by this author on:
Sandra Dugan
University of Stuttgart, Stuttgart, Germany
Anne Jüngert
University of Stuttgart, Stuttgart, Germany
Paper No:
PVP2017-66210, V005T10A013; 7 pages
Published Online:
October 26, 2017
Citation
Dugan, S, & Jüngert, A. "Ultrasonic Inspection of Dissimilar Metal Welds for Probabilistic Reliability Assessment of Pipe Welds." Proceedings of the ASME 2017 Pressure Vessels and Piping Conference. Volume 5: High-Pressure Technology; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD); SPC Track for Senate. Waikoloa, Hawaii, USA. July 16–20, 2017. V005T10A013. ASME. https://doi.org/10.1115/PVP2017-66210
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