ML063130412

Steam Generator Tube Inservice Inspection Report

ML063130412
Person / Time
Site:	Cook
Issue date:	10/31/2006
From:	Jensen J Indiana Michigan Power Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
AEP:NRC:6267
Download: ML063130412 (2)

Text

Indiana Michigan Power INDIANA Cook Nuclear Plant MICHIGAN One Cook Place Bridgman, Ml 49106 SPOWER AERcom A unit of American Electric Power October 31, 2006 AEP:NRC:6567 Docket No: 50-315 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Stop O-Pl-17 Washington, DC 20555-0001 Donald C. Cook Nuclear Plant Unit 1 STEAM GENERATOR TUBE INSERVICE INSPECTION REPORT Pursuant to the requirements of Donald C. Cook Nuclear Plant Unit 1 Technical Specification 5.6.7.a, Indiana Michigan Power Company is submitting this letter to notify the Nuclear Regulatory Commission of the number of tubes plugged during the Unit 1 Cycle 21 steam generator inspection.

The inspection was completed on October 17, 2006. A summary report is provided in the attachment to this letter.

This letter contains no new commitments. Should you have any questions, please contact Ms. Susan D. Simpson, Regulatory Affairs Manager, at (269) 466-2428.

Sincerely, Jon. Jensen Site Support Services Vice President Attachment RBH/jen c: J. L. Caldwell - NRC Region III K. D. Curry - AEP Ft. Wayne J. T. King- MPSC MDEQ - WHMD/RPMWS NRC Resident Inspector P. S. Tam, NRC Washington, DC ADLAq

ATTACHMENT TO AEP:NRC:6567 EDDY CURRENT FINDINGS AND REPAIRS DURING THE UNIT 1 CYCLE 21 REFUELING OUTAGE Eddy current inspections were conducted on each of the four Unit 1 steam generators during the 2006 Donald C. Cook Nuclear Plant (CNP) Unit 1 Cycle 21 outage (U1C21). The following table presents the tubes plugged prior to and during U 1C21:

11 2 0 2 12 0 0 0 13 1 11* 12 14 1** 1** 2 Total 4 12 16 Seven of the eleven tubes plugged were stabilized to bound a non-removable foreign object.

• • Tube R69/C45 was administratively plugged (no degradation present) in the 2002 U1C18 refueling outage. Inspections performed during UlC21 identified that the tube plug was properly installed in the cold leg location in 2002; however, it was incorrectly installed in the hot leg tube location. The hot leg location was mistakenly plugged in tube location R69/C63 instead of R69/C45. Corrective measures were performed in U1C21 to confirm neither of the affected tubes was degraded or defective and to correctly plug both the hot leg end of tube R69/C45 and the cold leg side of tube R69/C63, effectively removing both tubes from service. This event is being evaluated under the CNP Corrective Action Program.