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SCC Of Alloy 82 Weld Metal In BWR Water

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There is extensive evidence from laboratory data and plant experience of the SCC susceptibility of Alloy 82 weld metal in both BWR and PWR environments. Two international expert panels evaluated laboratory data under PWR conditions and created disposition curves to address the effects of stress intensity factor (K), temperature, and other factors. Another expert panel is creating a disposition
curve under BWR conditions for K, temperature, corrosion potential, impurities, and other factors. Nickel alloy weld metals at lower Cr levels (~15% Cr for Alloy 182 and ~20% Cr for Alloy 82) are more susceptible to SCC than weld metals of higher Cr content (~30% Cr for Alloy 52/152). This paper focuses on on-thefly effects on SCC growth rate of Alloy 82 weld metal in BWR environments of corrosion potential, water
purity and temperature.

Product Number: ED22-17242-SG
Author: Peter L. Andresen, Katsuhiko Kumagai
Publication Date: 2022
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Extensive stress corrosion crack (SCC) growth rate data on Alloy 82 weld metal have been obtained in high temperature water over the last four decades. This paper focuses on ‘on-the-fly’ effects of the environment – corrosion potential, water purity and temperature. Such data, where nothing changes but a single variable during crack advance, provide a higher level of confidence in the response than tests
on separate specimens because essentially identical microstructure is sampled while well-behaved, steady-state crack growth occurs. In many cases, the on-the-fly changes are evaluated by changing the environment then returning to the initial conditions.



Extensive stress corrosion crack (SCC) growth rate data on Alloy 82 weld metal have been obtained in high temperature water over the last four decades. This paper focuses on ‘on-the-fly’ effects of the environment – corrosion potential, water purity and temperature. Such data, where nothing changes but a single variable during crack advance, provide a higher level of confidence in the response than tests
on separate specimens because essentially identical microstructure is sampled while well-behaved, steady-state crack growth occurs. In many cases, the on-the-fly changes are evaluated by changing the environment then returning to the initial conditions.



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