United States Nuclear Regulatory Commission - Protecting People and the Environment

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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