ML080330028

Review of the 2006 (SL2-16) Steam Generator Tube Inspections

ML080330028
Person / Time
Site:	Saint Lucie
Issue date:	02/08/2008
From:	Mozafari B NRC/NRR/ADRO/DORL/LPLII-2
To:	Stall J Florida Power & Light Co
Mozafari B, NRR/ADRO/DORL, 415-2020
References
TAC MD5523
Download: ML080330028 (5)

Text

February 8, 2008 Mr. J. A. Stall Senior Vice President, Nuclear and Chief Nuclear Officer Florida Power and Light Company P.O. Box 14000 Juno Beach, Florida 33408-0420

SUBJECT:

St. LUCIE UNIT 2 - REVIEW OF THE 2006 STEAM GENERATOR TUBE INSPECTIONS (TAC NO. MD5523)

Dear Mr. Stall:

By letters dated May 4, 2007, September 20, June 28, and May 18, 2006, Florida Power & Light Company (the licensee) submitted information summarizing the results of the 2006 steam generator tube inspections at St. Lucie Plant, Unit 2. These inspections were performed during the sixteenth refueling (SL2-16) outage. In addition to these reports, the U.S. Nuclear Regulatory Commission (NRC) staff participated in a conference call concerning the 2006 steam generator tube inspections at St. Lucie Plant, Unit 2. This conference call was summarized by the NRC staff in a letter dated August 3, 2006. A public meeting was also held prior to the SL2-16 outage to discuss the licensees steam generator inspection plan. This meeting was summarized in a document dated May 11, 2006.

Based on a review of the material provided by the licensee, the NRC staff concludes that the licensee provided the information required by its technical specifications. In addition, the NRC staff did not identify any issues that warrant additional follow-up.

Further details on the bases for the NRC staff=s conclusions are contained in the enclosed safety evaluation. If you have any questions regarding this issue, please feel free to contact me, at (301) 415-2020.

Sincerely,

/RA/

Brenda L. Mozafari, Senior Project Manager Project Directorate II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-389

Enclosure:

Evaluation cc w/enclosure: See next page

ML080330028 NRR-106 OFFICE LPLII-2/PM LPLII-2/LA DCI/CSGB LPLII-2/BC NAME BMozafari BClayton AHiser TBoyce By memo dated DATE 02/07/08 02/06/08 9/26/07 02/08/08 EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION STEAM GENERATOR TUBE INSPECTION REPORTS FOR FALL 2006 ST. LUCIE UNIT 2 DOCKET NO. 50-389 By letters dated May 4, 2007 (ML071350383), September 20, 2006 (ML062710350),

June 28, 2006 (ML061870466) and May 18, 2006, (ML061520494), Florida Power & Light (the licensee) submitted information summarizing the results of the 2006 steam generator (SG) tube inspections at St. Lucie Unit 2. These inspections were performed during the sixteenth refueling (SL2-16) outage. In addition to these reports, the U.S. Nuclear Regulatory Commission staff participated in a conference call concerning the 2006 SG tube inspections at St. Lucie Unit 2. This conference call was summarized by the staff in a letter dated August 3, 2006 (ML062060280). A public meeting was also held prior to the SL2-16 outage to discuss the licensees SG inspection plan. This meeting was summarized in a document dated May 11, 2006 (ML061250260).

St. Lucie Unit 2 had two Combustion Engineering Model 3410 SGs. The mill annealed Alloy 600 SG tubes had an outside diameter of 3/4 inch and a nominal wall thickness of 0.048 inch.

The tubes were explosively expanded for the full depth of the tubesheet at each end and supported by a number of carbon steel lattice grid (i.e., eggcrate) tube supports, diagonal bars, and vertical straps.

This was the last scheduled inspection of the original SGs. They were replaced during the refueling outage in the fall of 2007. The philosophy of plug on detection was used for all eddy current indications of degradation except for mechanical wear. Mechanical wear indications were sized and left in service if they were less than 35 percent through wall.

The licensee was authorized to repair tubes using Alloy 800 tube sleeves. However, no tubes were repaired with this method at SL2 either prior to or during the 2006 outage.

During the outage, the licensee discovered that portions of two tubes received an incomplete rotating probe inspection during the 2005 outage. Assessments, including in situ pressure testing of one of those locations, indicated that the tubes had adequate integrity. Additional corrective actions taken in response to these findings are documented in the licensees June 28, 2006, letter.

The licensee provided the scope, extent, methods, and results of the 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 NRC staff concludes that the licensee provided the information required by technical specifications. In addition, the NRC staff concludes that there are no technical issues that warrant follow-up action, because the inspections appeared to be consistent with the objective of detecting potential tube degradation and the inspection results appeared to be consistent with industry operating experience at similarly designed and operated units.

ENCLOSURE

Florida Power and Light Company ST. LUCIE PLANT cc:

Mr. Mano Nazar Mr. Christopher R. Costanzo Senior Vice President Plant General Manager and Nuclear Chief Operating Officer St. Lucie Nuclear Plant South Region 6351 South Ocean Drive Florida Power & Light Company Jensen Beach, Florida 34957 P.O. Box 14000 Juno Beach, FL 33408 Mr. Terry Patterson Licensing Manager Senior Resident Inspector St. Lucie Nuclear Plant St. Lucie Plant 6351 South Ocean Drive U.S. Nuclear Regulatory Commission Jensen Beach, Florida 34957 P.O. Box 6090 Jensen Beach, Florida 34957 Don E. Grissette Vice President, Nuclear Training Craig Fugate, Director and Performance Improvement Division of Emergency Preparedness Florida Power & Light Company Department of Community Affairs P.O. Box 14000 2740 Centerview Drive Juno Beach, FL 33408-0420 Tallahassee, Florida 32399-2100 Mr. Rajiv S. Kundalkar M. S. Ross, Managing Attorney Vice President - Nuclear Technical Services Florida Power & Light Company Florida Power & Light Company P.O. Box 14000 P.O. Box 14000 Juno Beach, FL 33408-0420 Juno Beach, FL 33408-0420 Marjan Mashhadi, Senior Attorney Mr. J. Kammel Florida Power & Light Company Radiological Emergency 801 Pennsylvania Avenue, NW. Planning Administrator Suite 220 Department of Public Safety Washington, DC 20004 6000 Southeast Tower Drive Stuart, Florida 34997 Mr. Douglas Anderson County Administrator Mr. Bill Parks St. Lucie County Operations Manager 2300 Virginia Avenue St. Lucie Nuclear Plant Fort Pierce, Florida 34982 6351 South Ocean Drive Jensen Beach, Florida 34957-2000 Mr. William A. Passetti, Chief Department of Health Mr. Seth B. Duston Bureau of Radiation Control Training Manager 2020 Capital Circle, SE, Bin #C21 St. Lucie Nuclear Plant Tallahassee, Florida 32399-1741 6351 South Ocean Drive Jensen Beach, Florida 34957-2000 Mr. Gordon L. Johnston Site Vice President St. Lucie Nuclear Plant 6351 South Ocean Drive Jensen Beach, Florida 34957-2000