alloy 82 182 weld metal fabrication flaws With the recent occurrences of primary water stress corrosion cracking (PWSCC) at nickel-based dissimilar metal welds (specifically Alloy 82/182 welds) in the nation’s pressurized .
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0 · Welding Residual Stress and Flaw Evaluation for Dissimilar Metal
1 · Topical Report: Application of the Excavate and Weld Repair
2 · Regulatory Perspective on Advanced Finite Element Flaw Growth
3 · Nondestructive Evaluation: Inspection and Mitigation of Alloy
4 · Natural Crack Growth Analyses for Circumferential and Axial
5 · Industry Response Alloy 82/182 Weld Cracking
6 · Enclosure 11
7 · Alloy 82/182 Pipe Butt Weld Safety Assessment MRP
8 · Alloy 82/182 Pipe Butt Weld Inspections
9 · Alloy 600, 82/182 Weld Integrity Issue
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Welding Residual Stress and Flaw Evaluation for Dissimilar Metal
"* Ductile limit load solutions available for through wall and part through-wall flaws. "* Methods available for both axial and circumferential flaws. • For circumferential flaws, both axial bending .MRP letter 2004-05: “Each PWR perform a direct visual inspection of the bare metal at all Alloy 82/182 pressure boundary butt weld locations within the next 2 refueling outages.” Obtain plant .Inspection & Mitigation of Alloy 82/182 Butt Welds Summary • This project will build on the previously funded (MRP) work allowing the application of economically feasible pre-emptive .After many years of operating these nuclear facilities, it has been learned that Alloy 82/182 weld metal can become susceptible to pressurized water stress corrosion cracking (PWSCC) during .
Interim Safety Assessment for Alloy 82/182 Pipe Butt Welds (MRP 44, Part 1) Ł Plants have adequate margin to continue operation Ł Cracks expected to be predominantly axial due to . With the recent occurrences of primary water stress corrosion cracking (PWSCC) at nickel-based dissimilar metal welds (specifically Alloy 82/182 welds) in the nation’s pressurized .
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Welding Residual Stress and Flaw Evaluation for Dissimilar Metal Welds With Alloy 52 Inlays The natural crack growth analysis (sometimes referred to as advanced finite element analysis (AFEA)) methodology has been developed by the US NRC and the nuclear .postulated flaws in Alloy 82/182 butt welds • Specific analyses included – Critical flaw size – Time to through wall leak – Time between 1 gpm/10 gpm and failure – Leak rate as function of flaw .Excavate and weld repair (EWR) is an alternative to weld-overlay repairs for large-bore nozzle welds (>24 inches outside diameter) to minimize the time required to perform the repair and to .
"* Ductile limit load solutions available for through wall and part through-wall flaws. "* Methods available for both axial and circumferential flaws. • For circumferential flaws, both axial bending moment and torsion are specifically treated. design.MRP letter 2004-05: “Each PWR perform a direct visual inspection of the bare metal at all Alloy 82/182 pressure boundary butt weld locations within the next 2 refueling outages.” Obtain plant-specific information on weld joint configurations and available access to prepare for future volumetric examinations.
Inspection & Mitigation of Alloy 82/182 Butt Welds Summary • This project will build on the previously funded (MRP) work allowing the application of economically feasible pre-emptive weld overlays to large (greater than 27 inch diameter) Alloy 600 components which meets MRP-139 commitments • Additionally, it will close several inspection gapsAfter many years of operating these nuclear facilities, it has been learned that Alloy 82/182 weld metal can become susceptible to pressurized water stress corrosion cracking (PWSCC) during the course of a plant’s operating life.Interim Safety Assessment for Alloy 82/182 Pipe Butt Welds (MRP 44, Part 1) Ł Plants have adequate margin to continue operation Ł Cracks expected to be predominantly axial due to stresses Ł Axial cracks in butt welds bounded by resistant low alloy steel or stainless steel material Ł Critical flaw size for rupture several times width of weld With the recent occurrences of primary water stress corrosion cracking (PWSCC) at nickel-based dissimilar metal welds (specifically Alloy 82/182 welds) in the nation’s pressurized water reactors (PWRs), the commercial nuclear power industry has been proposing a number of mitigation strategies for dealing with the problem.
Welding Residual Stress and Flaw Evaluation for Dissimilar Metal Welds With Alloy 52 Inlays
The natural crack growth analysis (sometimes referred to as advanced finite element analysis (AFEA)) methodology has been developed by the US NRC and the nuclear industry to evaluate the natural crack growth due to primary water stress corrosion cracking (PWSCC) in nickel-based alloy materials.
postulated flaws in Alloy 82/182 butt welds • Specific analyses included – Critical flaw size – Time to through wall leak – Time between 1 gpm/10 gpm and failure – Leak rate as function of flaw size – Margin between leak and failureExcavate and weld repair (EWR) is an alternative to weld-overlay repairs for large-bore nozzle welds (>24 inches outside diameter) to minimize the time required to perform the repair and to provide an alternative for cases in which significant physical interferences near the Alloy 82/182 dissimilar metal weld make it difficult to install an over."* Ductile limit load solutions available for through wall and part through-wall flaws. "* Methods available for both axial and circumferential flaws. • For circumferential flaws, both axial bending moment and torsion are specifically treated. design.
Topical Report: Application of the Excavate and Weld Repair
MRP letter 2004-05: “Each PWR perform a direct visual inspection of the bare metal at all Alloy 82/182 pressure boundary butt weld locations within the next 2 refueling outages.” Obtain plant-specific information on weld joint configurations and available access to prepare for future volumetric examinations.Inspection & Mitigation of Alloy 82/182 Butt Welds Summary • This project will build on the previously funded (MRP) work allowing the application of economically feasible pre-emptive weld overlays to large (greater than 27 inch diameter) Alloy 600 components which meets MRP-139 commitments • Additionally, it will close several inspection gaps
After many years of operating these nuclear facilities, it has been learned that Alloy 82/182 weld metal can become susceptible to pressurized water stress corrosion cracking (PWSCC) during the course of a plant’s operating life.Interim Safety Assessment for Alloy 82/182 Pipe Butt Welds (MRP 44, Part 1) Ł Plants have adequate margin to continue operation Ł Cracks expected to be predominantly axial due to stresses Ł Axial cracks in butt welds bounded by resistant low alloy steel or stainless steel material Ł Critical flaw size for rupture several times width of weld With the recent occurrences of primary water stress corrosion cracking (PWSCC) at nickel-based dissimilar metal welds (specifically Alloy 82/182 welds) in the nation’s pressurized water reactors (PWRs), the commercial nuclear power industry has been proposing a number of mitigation strategies for dealing with the problem. Welding Residual Stress and Flaw Evaluation for Dissimilar Metal Welds With Alloy 52 Inlays
The natural crack growth analysis (sometimes referred to as advanced finite element analysis (AFEA)) methodology has been developed by the US NRC and the nuclear industry to evaluate the natural crack growth due to primary water stress corrosion cracking (PWSCC) in nickel-based alloy materials.postulated flaws in Alloy 82/182 butt welds • Specific analyses included – Critical flaw size – Time to through wall leak – Time between 1 gpm/10 gpm and failure – Leak rate as function of flaw size – Margin between leak and failure
Regulatory Perspective on Advanced Finite Element Flaw Growth
Nondestructive Evaluation: Inspection and Mitigation of Alloy
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alloy 82 182 weld metal fabrication flaws|Welding Residual Stress and Flaw Evaluation for Dissimilar Metal