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Development and Application of Materials Properties for Flaw Stability Analysis in Extreme Environment Service

[+] Author Affiliations
Robert L. Sindelar, Poh-Sang Lam, Andrew J. Duncan, Bruce J. Wiersma, Karthik H. Subramanian, James B. Elder

Savannah River National Laboratory, Aiken, SC

Paper No. PVP2007-26660, pp. 723-732; 10 pages
doi:10.1115/PVP2007-26660
From:
  • ASME 2007 Pressure Vessels and Piping Conference
  • Volume 6: Materials and Fabrication
  • San Antonio, Texas, USA, July 22–26, 2007
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4284-3 | eISBN: 0-7918-3804-8
  • Copyright © 2007 by Washington Savannah River Company LLC

abstract

Discovery of aging phenomena in the materials of a structure may arise after its design and construction that impact its structural integrity. This condition can be addressed through a demonstration of integrity with the material-specific degraded conditions. Two case studies of development of fracture and crack growth property data, and their application in development of in-service inspection programs for nuclear structures in the defense complex are presented. The first case study covers the development of fracture toughness properties in the form of J-R curves for rolled plate Type 304 stainless steel with Type 308 stainless steel filler in the application to demonstrate the integrity of the reactor tanks of the heavy water production reactors at the Savannah River Site. The fracture properties for the base, weld, and heat-affected zone of the weldments irradiated at low temperatures (110°–150°C) up to 6.4 dpaNRT and 275 appm helium were developed. An expert group provided consensus for application of the irradiated properties for material input to acceptance criteria for ultrasonic examination of the reactor tanks. Dr. Spencer H. Bush played a lead advisory role in this work. The second case study covers the development of fracture toughness for A285 carbon steel in high level radioactive waste tanks. The approach in this case study incorporated a statistical experimental design for material testing to address metallurgical factors important to fracture toughness. Tolerance intervals were constructed to identify the lower bound fracture toughness for material input to flaw disposition through acceptance by analysis.

Copyright © 2007 by Washington Savannah River Company LLC

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