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Since the structural integrity of thin-walled tubes in the nuclear heat exchangers is crucial from the viewpoint of safety and reliability, the integrity evaluation for cracked tubes is quite important. Accurate estimation of the failure load is a key element of the structural integrity assessment. In this paper, three-dimensional finite element analyses are carried out for tubes with various sizes of circumferential through-wall cracks in order to determine the failure load under combined loading condition. The analysis results can be directly applied to the practical integrity assessment of cracked heat exchanger tubes, because the comparison between experimental data and finite element analysis results shows a good agreement.