Through Thickness Residual Stress Measurement in a Full Structural Weld Overlay on PWR Pressuriser Nozzle

D. M. Goudar, E. J. Kingston, M. Smith, A. Goodfellow, S. Marlette, P. Freyer

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

British Energy funded a large programme to pre-emptively investigate the use of structural weld overlays (SWOLs) to mitigate against crack initiation and growth within the dissimilar metal welds (DMW) found in the pressuriser safety/relief valve nozzle components in their Sizewell B nuclear power plant (NPP). Deep-hole drilling (DHD) measurements were carried out to provide confidence in and hence validate the residual stresses predicted along the DMW centreline of the “virgin” and “overlaid” nozzle using finite element analysis (FEA). The predicted residual stresses were then used for subsequent fatigue crack growth rate analysis. The residual stresses measured at all three locations within the “virgin” nozzle were in very good agreement, while for the “overlaid” nozzle good agreement was seen at depths greater than 25% from the inner surface of the nozzle. It was found that the SWOL reduces the magnitude of the tensile stresses in the underlying DMW and causes a much deeper compressive stress zone. Relatively good agreement was observed between the FEA results and the measurement results.
Translated title of the contributionThrough Thickness Residual Stress Measurement in a Full Structural Weld Overlay on PWR Pressuriser Nozzle
Original languageEnglish
Title of host publicationInternational conference on Structural Mechanics in Reactor Technology
Pages1 - 8
VolumeDiv-II: Paper ID 153
Publication statusPublished - 2011

Bibliographical note

Name and Venue of Event: 6-11 November, New Delhi

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