Assessment of Internal Oxidation (IO) as a Mechanism for Submodes of Stress Corrosion Cracking (SCC) that Occur on the Secondary Side of Steam Generators (NUREG/CR-6827, RWS 154)
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Publication Information
Manuscript Completed: April 2005
Date Published: October 2006
Prepared by:
Dr. Roger W. Staehle, Consultant
22 Red Fox Road
North Oaks, MN 55127
USA
Under Contract to:
Argonne National Laboratory
9700 South Cass Avenue
Argonne, IL 60439
Todd Mintz, NRC Project Manager
Prepared for:
Division of Fuel, Engineering & Radiological Research
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555–0001
NRC Job Code Y6588
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Abstract
A mechanism of "internal oxidation" (IO) is assessed for its applicability to interpreting the stress corrosion cracking (SCC) of high nickel alloys in high temperature deaerated water. This submode of SCC is "low potential stress corrosion cracking" (LPSCC). The applicability of the IO mechanism to LPSCC is assessed mainly with respect to the dependence of LPSCC on electrochemical potential and on the diffusivity of oxygen in grain boundaries. For these two considerations, IO does not provide quantitative interpretations of LPSCC.
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