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Influence Of Cavitation Peening On The Propagation Of Stress Corrosion Cracks With Various Depths In Alloy 182 Exposed To PWR Primary Water

Alloy 600 and its weld alloys 182 and 82 are susceptible to Primary Water Stress Corrosion Cracking (PWSCC). Various mitigation techniques have been developed and qualified in recent years that aim to use compressive surface membrane stresses to prevent cracks from forming or to stop the growth of short cracks. As described in the parent article (“Part 1”), Ultra-High Pressure Cavitation Peening (UHPCP) developed by Framatome (previously AREVA NP) uses this approach to mitigate Alloy 600 and
Alloy 182 locations against PWSCC.

Product Number: ED22-17250_2-SG
Author: Mychailo Toloczko, Ryan Bouffioux, Chris Waskey, Darren Wood, Eric Visse, Sophie Maingot, Dojun Na, Daniel Brimbal, Antoine Marion, Maxime Berthaud, Jean Paul Massoud
Publication Date: 2022
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Ultra-High Pressure Cavitation Peening (UHPCP) was developed by Framatome to mitigate Alloy 600 and Alloy 182 surfaces against primary water stress corrosion cracking (PWSCC). This process creates a compressive membrane stress to a depth of ~1 mm. The effectiveness of UHPCP as a preventive measure against PWSCC initiation was demonstrated previously, but data were still lacking concerning
the effect of UHPCP when applied to surfaces with short preexisting cracks within or just beyond the depth of peening. To investigate this scenario, Framatome sponsored two research projects. In one project, PWSCC cracks were generated on statically loaded massive-bend Alloy 182 specimens (see the “Part 1” paper in this conference), while in the other project described in this paper, actively loaded 4- point bend specimens with in-situ measurement of crack propagation were utilized. A multi-step process was devised and executed to generate a short PWSCC crack with documented active crack growth on 4-point bend specimens. The tensile loaded surface of the specimens was treated by UHPCP, and the specimens were subsequently exposed to simulated PWR primary water at 360°C where crack growth behavior was monitored in-situ using direct current potential drop.

Ultra-High Pressure Cavitation Peening (UHPCP) was developed by Framatome to mitigate Alloy 600 and Alloy 182 surfaces against primary water stress corrosion cracking (PWSCC). This process creates a compressive membrane stress to a depth of ~1 mm. The effectiveness of UHPCP as a preventive measure against PWSCC initiation was demonstrated previously, but data were still lacking concerning
the effect of UHPCP when applied to surfaces with short preexisting cracks within or just beyond the depth of peening. To investigate this scenario, Framatome sponsored two research projects. In one project, PWSCC cracks were generated on statically loaded massive-bend Alloy 182 specimens (see the “Part 1” paper in this conference), while in the other project described in this paper, actively loaded 4- point bend specimens with in-situ measurement of crack propagation were utilized. A multi-step process was devised and executed to generate a short PWSCC crack with documented active crack growth on 4-point bend specimens. The tensile loaded surface of the specimens was treated by UHPCP, and the specimens were subsequently exposed to simulated PWR primary water at 360°C where crack growth behavior was monitored in-situ using direct current potential drop.