This paper addresses thermal shock cracking, a critical damage mechanism for pressurized components, currently absent from design and fitness-for-purpose codes. It analyzes the crack growth mechanisms and proposes guidelines for designing vessels to resist thermal shock crack initiation and for assessing the significance of existing cracks discovered during service. Thermal shock crack growth is influenced by factors like shock severity, applied mechanical stress, and the corrosive environment. In service, cracks often arrest and pose minimal risk. This work explores a broader range of conditions, offering a less conservative approach compared to existing EPRI guidelines.

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