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The report documents closeout of IE Bulletin 79-13 regarding cracks in the feedwater system piping of certain PWRs. Closeout is based on implementation and verification of six required actions by licensees and three required actions by designated applicants for operating licenses (DAOLs). Evaluations of licensee responses, NRC/Regional inspection reports, and NRC memoranda in accordance with specific criteria indicates that the bulletin is closed for all of the 54 PWRs required to respond, including 13 DAOLs. It is concluded that (1) actions required by the bulletin have been taken by the affected facilities, and (2) the concerns expressed in the bulletin were validated in that cracks were found and corrected at 18 of the 54 facilities.