ML11244A055
| ML11244A055 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 09/12/2011 |
| From: | Jacqueline Thompson Plant Licensing Branch II |
| To: | Morris J Duke Energy Carolinas |
| Thompson J, NRR/DORLl/LPL2-1, 415-1119 | |
| References | |
| TAC ME5834 | |
| Download: ML11244A055 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555*0001 September 12, 2011 Mr. J. R. Morris Site Vice President Catawba Nuclear Station Duke Energy Carolinas, LLC 4800 Concord Road York, SC 29745
SUBJECT:
CATAWBA NUCLEAR STATION, UNIT 2 (CATAWBA 2) - REVIEW OF THE 2010 STEAM GENERATOR (SG) TUBE INSPECTIONS DURING REFUELING OUTAGE 17 END OF CYCLE (EOC 17) (TAC NO. ME5834)
Dear Mr. Morris:
By letters dated January 19, 2011 (Agencywide Documents Access and Management System (ADAMS), Accession No. ML110200322), April 5, 2001 (ADAMS Accession No. ML110980601),
and June 27,2011 (ADAMS Accession No. ML11180A269), Duke Energy Carolinas, LLC (the licensee), submitted information summarizing the results of the 2010 SG tube inspections at Catawba 2. These inspections were performed during EOC 17.
The Nuclear Regulatory Commission (NRC) staff has completed its review of the submittal and concludes that the licensee provided the information required by the Catawba 2 Technical Specifications. No additional follow up is required at this time. The NRC staff's review of the letters dated January 19, 2011, April 5, 2011, and June 27, 2011, is enclosed.
If you have any questions, please call me at 301-415-1119.
Sincerely, Jon Thompson, Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-414
Enclosure:
Staff Evaluation cc w/encl: Distribution via Listserv
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 STAFF'S EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO RESULTS OF 2010 STEAM GENERATOR TUBE INSPECTIONS PERFORMED DURING REFUELING OUTAGE 17 CATAWBA NUCLEAR STATION, UNIT 2 DOCKET NO. SO-414 By letters dated January 19, 2011 (Agencywide Documents Access and Management System (ADAMS), Accession No. ML110200322), AprilS, 2001 (ADAMS Accession No. ML110980601),
and June 27, 2011 (ADAMS Accession No. ML11180A269), Duke Energy Carolinas, LLC (the licensee), submitted information summarizing the results of the 2010 steam generator (SG) tube inspections at Catawba Nuclear Station, Unit 2 (Catawba 2). These inspections were performed during refueling outage (RFO) 17 end of cycle (EOC 17).
Catawba 2 has four Westinghouse Electric Company Model OS SGs, which are designated 2A through 20. Each SG has 4,S70 thermally treated Alloy 600 tubes with an outside diameter of 0.7S0 inch and a nominal wall thickness of 0.043 inch. The tubes are hydraulically expanded for the full depth of the tubesheet at each end. The tubes are supported by Type 40S stainless steel support plates with quatrefoil-shaped holes. The U-bend region of the tubes installed in Rows 1 through 9 was thermally treated after bending in order to reduce stress.
The licensee provided the scope, extent, methods, and results of the Catawba 2 SG tube inspections in the documents referenced above. In addition, the licensee described corrective actions (i.e., tube plugging) taken in response to the inspection findings.
No stress corrosion cracking was observed at the top of the tubesheet or at the tube support elevations during the RFO 17.
Based on a review of the information provided, the Nuclear Regulatory Commission (NRC) staff concludes that the licensee provided the information required by their technical specifications for Catawba 2. 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: A. Johnson Date: September 12, 2011 Enclosure
September 12, 2011 Mr. J. R. Morris Site Vice President Catawba Nuclear Station Duke Energy Carolinas, LLC 4800 Concord Road York, SC 29745
SUBJECT:
CATAWBA NUCLEAR STATION, UNIT 2 (CATAWBA 2) - REVIEW OF THE 2010 STEAM GENERATOR (SG) TUBE INSPECTIONS DURING REFUELING OUTAGE 17 END OF CYCLE (EOC 17) (TAC NO. ME5834)
Dear Mr. Morris:
By letters dated January 19, 2011 (Agencywide Documents Access and Management System (ADAMS), Accession No. ML110200322), April 5, 2001 (ADAMS Accession No. ML110980601),
and June 27,2011 (ADAMS Accession No. ML11180A269), Duke Energy Carolinas, LLC (the licensee), submitted information summarizing the results of the 2010 SG tube inspections at Catawba 2. These inspections were performed during EOC 17.
The Nuclear Regulatory Commission (NRC) staff has completed its review of the submittal and concludes that the licensee provided the information required by the Catawba 2 Technical Specifications. No additional follow up is required at this time. The NRC staff's review of the letters dated January 19, 2011, April 5, 2011, and June 27, 2011, is enclosed.
If you have any questions, please call me at 301-415-1119.
Sincerely, IRA!
Jon Thompson, Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-414
Enclosure:
Staff Evaluation cc w/encl: Distribution via Listserv DISTRIBUTION:
PUBLIC RidsNrrDorlLpl2-1 Resource LPL2-1 R/F KKarwoski, NRR RidsRgn2MailCenter Resource RidsAcrsAcnw MailCTR Resource AJohnson, NRR RidsNrrLAMOBrien Resource (hard copy)
RidsNrrDciCsgb Resource (RTaylor)
RidsOgcRp Resource RidsNrrPMCatawba Resource (hard copy)
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