NDLI: A Fracture Mechanics Evaluation of an Indication in an RPV Vertical Shell Weld Produced by the Upjohn Welding Technique

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Hardayal, S. Mehta Wade, F. Miller Brooks, M. A.
Copyright Year	2004
Abstract	A reactor pressure vessel (RPV) manufacturer used the Upjohn welding technique to fabricate the longitudinal and meridional seam welds in a number of RPVs. The Upjohn welding process allowed fabrication of heavy plate sections without the use of positioning devices. With this welding technique, the major dimension of fabrication flaws extends through the weld thickness rather than parallel to the thickness as with other fabrication welding techniques. One vertical weld seam of a RPV fabricated using the Upjohn weld process was examined by ultrasonic techniques consistent with PDI requirements. Flaws were detected during the ASME Code required in-service inspection. After the application of the flaw proximity rules, one indication was characterized as a planar flaw 4.24 inches long (along the weld thickness direction) and 2-inches wide. One end of the indication was located 0.7 inch from the ID surface, which included a clad thickness of 5/16 inch. The use of Section XI flaw characterization and proximity rules would have required the characterization of this flaw as a large surface flaw. Therefore, a three-dimensional finite element model, including crack tip elements, was developed to determine the increase in the theoretical infinite plate K value due to the edge effect. The flaw evaluation was based on the guidelines of Appendix A of ASME Section XI. The allowable K values considered adjusted reference temperature (ART) based on cumulative fluence from operation to end of design life, which included a 20-year license renewal period. Because the calculated values of K were less than the allowable values of K, it was concluded that the indication is not expected to become a surface indication during future operation. Discussion on recommendations for RPVs with Upjohn welds, suggested changes to ASME Section XI Paragraph IWB-3610 and a comparison with the RPV flaw database is also provided.
Sponsorship	Pressure Vessels and Piping Division
Starting Page	189
Ending Page	197
Page Count	9
File Format	PDF
ISBN	0791846700
DOI	10.1115/PVP2004-2559
Volume Number	Flaw Evaluation, Service Experience, and Materials for Hydrogen Service
Conference Proceedings	ASME/JSME 2004 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2004-07-25
Publisher Place	San Diego, California, USA
Access Restriction	Subscribed
Subject Keyword	Temperature Fracture mechanics Reactor vessels Welding Shells Dimensions Fracture (materials) Licensing Fluence (radiation measurement) Design Welded joints Finite element model Databases Manufacturing In-service inspection Asme standards
Content Type	Text
Resource Type	Article

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