ML13346A152
| ML13346A152 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 12/18/2013 |
| From: | Martin R Plant Licensing Branch II |
| To: | Pierce C Southern Nuclear Operating Co |
| Martin, Robert NRR/DORL 415-1493 | |
| References | |
| TAC MF2343 | |
| Download: ML13346A152 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 December 18, 2013 Mr. C. R. Pierce Regulatory Affairs Director Southern Nuclear Operating Company, Inc.
Post Office Box 1295, Bin - 038 Birmingham, AL 35201-1295
SUBJECT:
VOGTLE ELECTRIC GENERATING PLANT, UNIT 1-REGARDING THE 2012 STEAM GENERATOR TUBE INSPECTIONS (TAG NO. MF2343)
Dear Mr. Pierce:
By letter dated April 2, 2013 (Agencywide Documents Access and Management System Accession No. ML13093A178), Southern Nuclear Operating Company, Inc (the licensee) submitted information summarizing the results of the 2012 steam generator (SG) tube inspections at Vogtle Electric Generating Plant, Unit 1. These inspections were performed during the seventeenth refueling outage.
The staff concludes that the licensee provided the information required by their technical specifications and did not identify any technical issues that warrant follow-up action at this time.
The staff's review of the report is enclosed.
Docket No. 50-424
Enclosure:
Review of Report cc w/encl: Distribution via Listserv Sincerely,
~1n?~ect Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF NUCLEAR REACTOR REGULATION REVIEW OF THE FALL 2012 STEAM GENERATOR TUBE INSPECTION REPORT VOGTLE ELECTRIC GENERATING PLANT, UNIT 1 DOCKET NO. 50-424 By letter dated April 2, 2013 (Agencywide Documents Access and Management System Accession No. ML13093A178), Southern Nuclear Operating Company, Inc. (the licensee) submitted information to the U.S. Nuclear Regulatory Commission staff (staff) summarizing the results of the 2012 steam generator (SG) tube inspections at Vogtle Electric Generating Plant, Unit 1. These inspections were performed during the seventeenth refueling outage.
Subsequent to the submission of the report, the licensee clarified a few minor points of information with respect to their inspections. The details of these clarifications are summarized below.
Vogtle Electric Generating Plant, Unit 1, has four Westinghouse Model F SGs, each of which contains 5,626 U-bend thermally treated Alloy 600 tubes. Each tube has a nominal outside diameter of 0.688 inches and a nominal wall thickness of 0.040 inches. During SG fabrication, the tubes were hydraulically expanded, at both ends, over the full depth of the tubesheet.
Type 405 stainless steel support plates, which have broached quatrefoil holes, support the vertical section of the tubes, and anti-vibration bars support the U-bend section of the tubes.
At the time of this inspection, the SGs had accumulated approximately 22.6 effective full power years of operation.
The licensee provided the scope, extent, methods, and results of the SG tube inspections in the letter referenced above. In addition, the licensee described corrective actions (i.e., tube plugging) taken in response to the inspection findings. No indications of cracking were identified during this outage.
On October 2, 2013, the licensee clarified the following regarding their report:
The primary channel head inspections performed in the four SGs revealed no indications of degradation.
Enclosure Based on a review of the information provided, the staff concludes that the licensee provided the information required by their technical specifications. In addition, the 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: Andrew Johnson Date: December 18, 2013
Mr. C. R. Pierce Regulatory Affairs Director Southern Nuclear Operating Company, Inc.
Post Office Box 1295, Bin - 038 Birmingham, AL 35201-1295 December 18, 2013
SUBJECT:
VOGTLE ELECTRIC GENERATING PLANT, UNIT 1 -REGARDING THE 2012 STEAM GENERATOR TUBE INSPECTIONS (TAC NO. MF2343)
Dear Mr. Pierce:
By letter dated April 2, 2013 (Agencywide Documents Access and Management System Accession No. ML13093A178), Southern Nuclear Operating Company, Inc (the licensee) submitted information summarizing the results of the 2012 steam generator (SG) tube inspections at Vogtle Electric Generating Plant, Unit 1. These inspections were performed during the seventeenth refueling outage.
The staff concludes that the licensee provided the information required by their technical specifications and did not identify any technical issues that warrant follow-up action at this time.
The staff's review of the report is enclosed.
Docket No. 50-424 Sincerely, IRA I Robert E. Martin, Senior Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation
Enclosure:
Review of Report cc wlencl: Distribution via Listserv DISTRIBUTION:
PUBLIC LPL2-1 RIF RidsNrrDoriDpr Resource RidsNrrPMVogtle Resource KKarwoski, NRR RidsNrrDorllpl2-1 Resource RidsRgn2MaiiCenter Resource GKulesa, NRR AJohnson, NRR ADAMS A ccess1on N ML13346A152 o.:
OFFICE DORL/LPL2-1 /PM DORL/LPL2-1 /LA NRRIDE/ESGB NAME RMartin SFigueroa GKulesa DATE 12/16/13 12/12/13 11/22/13 RidsAcrsAcnw MaiiCTR Resource RidsNrrLASFigueroa Resource
- B sy memo d t d N 22 2013 ae ov DORL/LPL2-1 /BC DORL/LPL2-1 /PM RPascarelli RMartin 12/18/13 12/18/13 OFFICIAL RECORD COPY