ML051440076

Steam Generator Tube Inspection Report for the Year 2004 Refueling Outage

ML051440076
Person / Time
Site:	Calvert Cliffs
Issue date:	05/26/2005
From:	Richard Guzman NRC/NRR/DLPM/LPD1
To:	Vanderheyden G Calvert Cliffs
References
TAC MC6320
Download: ML051440076 (5)

Text

May 26, 2005 Mr. George Vanderheyden, Vice President Calvert Cliffs Nuclear Plant, Inc.

Calvert Cliffs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, MD 20657-4702

SUBJECT:

CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NO. 1 - STEAM GENERATOR TUBE INSPECTION REPORT FOR THE YEAR 2004 REFUELING OUTAGE (TAC NO. MC6320)

Dear Mr. Vanderheyden:

By letters dated May 6, 2004, February 25, 2005, and April 28, 2005, Calvert Cliffs Nuclear Power Plant, Inc. (CCNPPI), submitted information summarizing the steam generator tube inspections performed during the year 2004 refueling outage.

Upon review of this information, the Nuclear Regulatory Commission (NRC) staff concluded that CCNPPI provided the information required by the Technical Specifications and that no additional follow-up was required. The NRC staffs summary of review is enclosed.

Sincerely,

/RA by P. Tam/

Richard V. Guzman, Project Manager, Section 1 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-317

Enclosure:

As stated cc w/encl: See next page

May 26, 2005 Mr. George Vanderheyden, Vice President Calvert Cliffs Nuclear Plant, Inc.

Calvert Cliffs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, MD 20657-4702

SUBJECT:

CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NO. 1 - STEAM GENERATOR TUBE INSPECTION REPORT FOR THE YEAR 2004 REFUELING OUTAGE (TAC NO. MC6320)

Dear Mr. Vanderheyden:

By letters dated May 6, 2004, February 25, 2005, and April 28, 2005, Calvert Cliffs Nuclear Power Plant, Inc. (CCNPPI), submitted information summarizing the steam generator tube inspections performed during the year 2004 refueling outage.

Upon review of this information, the Nuclear Regulatory Commission (NRC) staff concluded that CCNPPI provided the information required by the Technical Specifications and that no additional follow-up was required. The NRC staffs summary of review is enclosed.

Sincerely,

/RA by P. Tam/

Richard V. Guzman, Project Manager, Section 1 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-317

Enclosure:

As stated cc w/encl: See next page Distribution:

PUBLIC PDI-1 R/F R. Laufer S. Little R. Guzman OGC ACRS G. Matakas, RI M. Yoder Accession Number: ML051440076 OFFICE PDI-1/PM PDI-1/LA EMCB/SC PDI-1/SC NAME PTam for SLittle LLund* PTam for RGuzman RLaufer DATE 5/26/05 5/26/05 5/12/05 5/26/05

• Evaluation transmitted by memo of 5/12/05.

OFFICIAL RECORD COPY

SUMMARY

OF REVIEW BY THE OFFICE OF NUCLEAR REACTOR REGULATION STEAM GENERATOR TUBE INSPECTION REPORT FOR THE REFUELING IN THE YEAR 2004 RENEWED FACILITY OPERATING LICENSE NO. DPR-53 CALVERT CLIFFS NUCLEAR POWER PLANT, INC.

CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NO. 1 (CCNPP1)

DOCKET NO. 50-317 By letters dated May 6, 2004 (Agencywide Document Access and Management System (ADAMS) Accession No. ML041330142), February 25, 2005 (Accession No. ML050610714),

and April 28, 2005 (Accession No. ML051250065), the licensee, submitted information pertaining to the 2004 steam generator (SG) inservice inspection reports performed at CCNPP1.

CCNPP1 has two Babcock and Wilcox International (BWI) SGs containing 8471 tubes each.

The tubing material is thermally treated Alloy 690. The tubes have an outside diameter of 0.75 inch and a nominal wall thickness of 0.042 inch. The SGs have a triangular tube pitch arrangement with 1-inch spacing between tube centers. The tubes are hydraulically expanded through the entire depth of the tubesheet in both the hot-leg and cold-leg ends. The tubesheet is 21.875 inches thick without the clad. The austentic stainless steel tubesheet cladding has a minimum thickness of 0.375 inch. The lattice grid tube support structures and the U-bend supports are made of 410 stainless steel. The smallest radii for the U-bend is 3.5 inches in Row 1. Rows 1-18 of the U-bend received stress relief treatment after bending.

A number of fan bar wear indications were observed at CCNPP1 during the 2004 outage. The wear is considered typical fan bar wear, caused by thermal hydraulic conditions and tube-to-support clearances which can vary because of manufacturing tolerances. Although the number of wear indications is more than that observed at similarly designed operational units, the size and type of wear is consistent with that observed at these units. There are no major design changes between the replacement SGs at CCNPP1 and other BWI replacement SGs that would account for the larger number of fan bar wear indications. All wear indications were inspected with a rotating probe and no anomalies were detected.

Enclosure

The licensee provided the scope, extent, methods, and results of its SG tube inspections in the documents referenced above. In addition, the licensee described corrective actions (e.g., tube plugging or repair) taken in response to the inspection findings. Based on a review of the information provided, the Nuclear Regulatory Commission (NRC) staff concludes that the licensee provided the information required by the CCNPP1 Technical Specifications. In addition, the NRC staff concludes that there are no technical issues that warrant follow-up action at this time since the inspections appear to be consistent with the objective of detecting potential tube degradation and the inspection results appear to be consistent with industry operating experience at similarly designed and operated units.

Principal Contributor: M. Yoder Date: May 26, 2005

Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2 cc:

President Patricia T. Birnie, Esquire Calvert County Board of Co-Director Commissioners Maryland Safe Energy Coalition 175 Main Street P.O. Box 33111 Prince Frederick, MD 20678 Baltimore, MD 21218 Carey Fleming, Esquire Mr. Loren F. Donatell Sr. Counsel - Nuclear Generation NRC Technical Training Center Constellation Generation Group, LLC 5700 Brainerd Road 750 East Pratt Street, 17th floor Chattanooga, TN 37411-4017 Baltimore, MD 21202 Lou Larragoite Calvert Cliffs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, MD 20657-4702 Resident Inspector U.S. Nuclear Regulatory Commission P.O. Box 287 St. Leonard, MD 20685 Mr. R. I. McLean, Administrator Radioecology Environ Impact Prog Department of Natural Resources Nuclear Evaluations 580 Taylor Avenue Tawes State Office Building Annapolis, MD 21401 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Kristen A. Burger, Esquire Maryland People's Counsel 6 St. Paul Centre Suite 2102 Baltimore, MD 21202-1631