Three-dimensional crack analysis applied to an LWR nozzle-cylinder intersection

Evaluations of the stress intensity factors around the profiles of four crack configurations at the inner crotch corner of a typical LWR nozzle-cylinder intersection in the pressure vessel are described. Three-dimensional finite element techniques are used, incorporating such recent developments to enhance the accuracy of the computed results as quadratic isoparametric elements with special singularity elements around the crack profile and a virtual crack extension method. Comparison with an alternative finite element set of results and suitable bounding approximate solutions are made.