Fatigue Testing of Steam Generator Materials Introduction In the US alone, material degradation problems due to Environmentally Assisted Degradation (EAD) - Fatigue, Corrosion Fatigue (CF), and Stress Corrosion Cracking (SCC), have cost the nuclear industry at least $10 billion in the last 30 years because of forced and extended outages, increased inspection requirements, component repairs/replacements, and increased scrutiny by the regulator. As designs demand higher performance and longer lives—up to 80 years proposed--incidences of environmentally assisted degradation will increase. Plant modifications and upgrades, compliance with new regulatory standards, and requirements that designs account for fatigue, are driving the need for fatigue testing. As Alloy 800 is being considered as a

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