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Liquid penetrant inspection of an ASTM A296 grade CA-15 residual heat removal pump impeller from a nuclear plant revealed a crack like indication that approximated the outer contour of the wear ring. Examination of a section containing the crack and three sections from near the main crack indication revealed that the failure was caused by hot cracking related to original weld repairs performed on the impeller casting.

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Carl J. Czajkowski, 1992. "Hot Cracking of a Pump Impeller From a Nuclear Plant", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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