Reactor systems impose one of the harshest corrosion environments in industrial operations. High-temperature water chemistry, dissolved oxygen control, and radiation fields accelerate various degradation modes—including stress corrosion cracking, pitting, and intergranular attack. Modern corrosion-resistant alloys help maintain system pressure boundaries and reduce unplanned outages.
Austenitic stainless steels and nickel-chromium alloys provide superior resistance to coolant-side corrosion, while ferritic-martensitic steels and low-alloy steels excel in high-pressure structural applications. Their performance depends not only on alloy composition but also on forging integrity, grain orientation, and heat treatment uniformity. High alloy fatigue resistance—achieved through controlled deformation during open-die forging—helps these materials endure continuous load cycling from reactor startups, shutdowns, and transient loads.
Advanced materials also slow the progression of irradiation-assisted stress corrosion cracking, a key safety concern for in-core and near-core components. Enhanced microstructural stability reduces susceptibility to localized damage, thereby extending service intervals and simplifying regulatory inspections.