ML13302A807

Summary of NRCs Review of the 2012 Steam Generator Tube Inservice Inspections

ML13302A807
Person / Time
Site:	Mcguire
Issue date:	11/01/2013
From:	Jason Paige Plant Licensing Branch II
To:	Capps S Duke Energy Carolinas
Paige Jason, NRR/DORL 415-5888
References
TAC MF1159
Download: ML13302A807 (3)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 November 1, 2013 Mr. Steven D. Capps Vice President McGuire Nuclear Station Duke Energy Carolinas, LLC 12700 Hagers Ferry Road Huntersville, NC 28078

SUBJECT:

MCGUIRE NUCLEAR STATION, UNIT 2 -

SUMMARY

OF NRC'S REVIEW OF THE 2012 STEAM GENERATOR TUBE INSERVICE INSPECTIONS (TAC NO.

MF1159)

Dear Mr. Capps:

By letter dated February 6,2013 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML13052A270), Duke Energy Carolinas, LLC, the licensee, submitted information summarizing the results of the 2012 steam generator tube inspections at McGuire Nuclear Station, Unit 2.

Based on a review of the material provided by the licensee, the U.S. Nuclear Regulatory Commission (NRC) concludes that the licensee provided the information required by their technical specifications. In addition, the NRC staff did not identify any issues that warrant additional follow-up at this time. The staff's review of the licensee's report is enclosed.

ason C. Paige, Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-370

Enclosure:

Summary cc w/encl: Distribution via Listserv

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555"()001 REVIEW OF THE 2012 STEAM GENERATOR TUBE INSERVICE INSPECTION REPORT MCGUIRE NUCLEAR STATION, UNIT 2 DOCKET NO. 50-370 TAC NO. MF1159 By letter dated February 6, 2013 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML13052A270), Duke Energy Carolinas, LLC, the licensee, submitted information summarizing the results of the 2012 steam generator (SG) tube inspections at McGuire Nuclear Station (McGuire), Unit 2.

McGuire, Unit 2, has four recirculating SGs designed and fabricated by Babcock and Wilcox International (BWI). The model CFR 80 SGs were put into service in 1997 during refueling outage eleven (RF011). Each SG has 6,633 thermally treated Alloy 690 tubes, which have a nominal outside diameter of 0.688 inches and a nominal wall thickness of 0.040 inches. The tubes were hydraulically expanded at each end for the full depth of the tubesheet.

The licensee provided the scope, extent, methods, and results of the McGuire, Unit 2, SG tube inspections in the document referenced above. In addition, the licensee described corrective actions (Le., tube plugging) taken in response to the inspection findings.

On August 8, 2013, the licensee clarified the followir19 during a conference call:

Erosion of the secondary separators has been observed in BWI SGs. At McGuire, SG A is used as the leading SG in both Units 1 and 2. In Unit 1, in addition to inspecting the secondary separator in SG A, SG D has also been inspected. The level of erosion of the secondary separators in SG D of Unit 1 is similar to that in SG A of Unit 1. SG A in Unit 2 has more erosion than that observed in Unit 1 and more than that observed at Catawba (which also has SGs fabricated by BWI). Additional secondary side separators will be inspected during the next planned inspection outage. In summary, operating experience from the fleet of BWI SGs is used to inform the inspections of the secondary side separators at McGuire.

The lattice grid inspections indicated there was no blockage or bridging of deposits in the area where the tube passes through the lattice grid.

The 2012 inspection was performed during RF021. At the time of the inspection, the SGs were 0.34 effective full power years (EFPYs) into the 108 effective full power month sequential period. At the RF016 inspections, the SGs had operated 5.48 EFPY since the first inservice inspection (6.8 EFPY since replacement). At RF019, the SGs had operated 9.55 EFPY since the first inservice inspection.

Enclosure

- 2 Visual inspections were performed of all of the steam generator channel head bowls. No degradation was observed as a result of those inspections.

Based on a review of the information provided, the U.S. Nuclear Regulatory Commission (NRC) concludes that the licensee provided the information required by the 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.

November 1, 2013 Mr. Steven D. Capps Vice President McGuire Nuclear Station Duke Energy Carolinas, LLC 12700 Hagers Ferry Road Huntersville, NC 28078

SUBJECT:

MCGUIRE NUCLEAR STATION, UNIT 2 -

SUMMARY

OF NRC'S REVIEW OF THE 2012 STEAM GENERATOR TUBE INSERVICE INSPECTIONS (TAC NO.

MF1159)

Dear Mr. Capps:

By letter dated February 6, 2013 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML13052A270). Duke Energy Carolinas, LLC, the licensee, submitted information summarizing the results of the 2012 steam generator tube inspections at McGuire Nuclear Station, Unit 2.

Based on a review of the material provided by the licensee, the U.S. Nuclear Regulatory Commission (NRC) concludes that the licensee provided the information required by their technical speci'fications. In addition, the NRC staff did not identify any issues that warrant additional follow-up at this time. The staff's review of the licensee's report is enclosed.

Sincerely, IRA!

Jason C. Paige, Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-370

Enclosure:

Summary cc w/encl: Distribution via Listserv DISTRIBUTION:

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