Abstract：The rotating groove in shell of one spent fuel transfer tank was cracked in the manufacture process. To determine the failure cause and prevent the similar failure event happening again, the chemical composition, mechanical properties, metallographic structure, and fracture morphology were analyzed to find out the fracture causes. The results showed that the failure model of the rotating groove was hydrogen-induced delayed cracking. The high content of hydrogen and aging embrittlement were the main reasons to cause hydrogen induced cracking of rotating groove.
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