Abstract
Within the past few years flaws have been discovered at the inside corners of feedwater nozzles of several operating boiling water reactors. The significance of these flaws has been evaluated for structural safety using linear elastic fracture mechanics. The evaluations have been based on stress intensity factors, K(a), which were obtained for a single flaw location and pressure loading only. Conservative assumptions were made to account for other flaw locations and the effect of thermal stresses. The report provides stress intensity factors for fifteen postulated corner flaw locations in a typical feedwater nozzle subjected to pressure and thermal stresses, and considers the effect of a residual stress caused by the weld-deposited cladding. The use of these data permits more accurate fracture mechanics evaluations of nozzle corner flaws.
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