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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). These alloys have often been replaced in existing PWRs by Alloy 690 and weld alloys 152 or 52, but this is not always economical or technically feasible. Thus, PWR components fabricated from Alloys 600 and 182 are still in service worldwide in locations such as Bottom Mounted Instrumentation (BMI) penetrations where both the nozzle and the J-groove welds are potentially susceptible to PWSCC.

Product Number: ED22-17250_1-SG
Author: Daniel Brimbal, Antoine Marion, Chris Waskey, Darren Wood, Eric Visse, Sophie Maingot, Dojun Na, Mychailo Toloczko, Ryan Bouffioux, Maxime Berthaud, Jean Paul Massoud
Publication Date: 2022
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Ultra-High Pressure Cavitation Peening (UHPCP) was developed by Framatome to mitigate Primary Water Stress Corrosion Cracking (PWSCC) in Alloy 600 and Alloy 182. The effectiveness of UHPCP as a preventive measure against PWSCC initiation was demonstrated previously, but data was still lacking concerning the effect of UHPCP on existing cracks. In this program, PWSCC was generated in actively
loaded 4-point bend specimens and on massive-bend specimens made of Alloy 182, then surfaces were treated by UHPCP and subsequently exposed to simulated Pressurized Water Reactor (PWR) primary water at 360°C. For the larger cracks (1-4 mm depths) in the massive bend specimens, qualitative correlations between
Eddy current measurements of crack advancement, crack morphology on the surface and final crack lengths on cross-sections demonstrate that UHPCP either reduces crack propagation or has a negligible effect on crack propagation. The study of small cracks (~1 mm) in the 4-point bend specimens is detailed in another article (see
“Part 2”).

Ultra-High Pressure Cavitation Peening (UHPCP) was developed by Framatome to mitigate Primary Water Stress Corrosion Cracking (PWSCC) in Alloy 600 and Alloy 182. The effectiveness of UHPCP as a preventive measure against PWSCC initiation was demonstrated previously, but data was still lacking concerning the effect of UHPCP on existing cracks. In this program, PWSCC was generated in actively
loaded 4-point bend specimens and on massive-bend specimens made of Alloy 182, then surfaces were treated by UHPCP and subsequently exposed to simulated Pressurized Water Reactor (PWR) primary water at 360°C. For the larger cracks (1-4 mm depths) in the massive bend specimens, qualitative correlations between
Eddy current measurements of crack advancement, crack morphology on the surface and final crack lengths on cross-sections demonstrate that UHPCP either reduces crack propagation or has a negligible effect on crack propagation. The study of small cracks (~1 mm) in the 4-point bend specimens is detailed in another article (see
“Part 2”).