ML18089A608
| ML18089A608 | |
| Person / Time | |
|---|---|
| Site: | Mcguire |
| Issue date: | 04/06/2018 |
| From: | Michael Mahoney Plant Licensing Branch II |
| To: | Teresa Ray Duke Energy Carolinas |
| Mahoney M, NRR/DORL/LPL2-1, 301-415-3867 | |
| References | |
| EPID L-2017-LRO-0022 | |
| Download: ML18089A608 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 Mr. Thomas D. Ray Vice President McGuire Nuclear Station Duke Energy Carolinas, LLC 12700 Hagers Ferry Road Huntersville, NC 28078-8985 April 6, 2018
SUBJECT:
MCGUIRE NUCLEAR STATION, UNIT 2 -REVIEW OF STEAM GENERATOR TUBE INSPECTION REPORT FOR THE CYCLE 24 REFUELING OUTAGE (EPID L-2017-LR0-0022)
Dear Mr. Ray:
By letter dated July 20, 2017 (Agencywide Documents Access and Management Systems Accession No. ML17207A102), Duke Energy (the licensee) submitted its steam generator tube inspection report for the McGuire Nuclear Station (McGuire), Unit 2 in accordance with Technical Specification (TS) 5.6.8, "Steam Generator Tube Inspection Report." The report summarizes the steam generator tube inspections that the licensee performed in the spring of 2017, during the McGuire, Unit 2 cycle 25 refueling outage. The U. S. Nuclear Regulatory Commission (NRC) staff completed its review of the submittal and concluded that the licensee provided the information required by McGuire's TSs. No additional follow-up is required at this time. This completes the NRC staff's efforts for EPID No. L-2017-LR0-0022.
The enclosure documents the NRC staffs review of the submittal.
Docket No. 50-370
Enclosure:
As stated cc: Listserv ect Manager Plant Licensing Br nch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation REVIEW BY THE OFFICE OF NUCLEAR REACTOR REGULATION SPRING 2017 STEAM GENERATOR TUBE INSPECTION REPORT DUKE ENERGY CAROLINAS, LLC. MCGUIRE NUCLEAR STATION, UNIT 2 DOCKET NO. 50-370 By letter dated July 17, 2017 (Agencywide Documents Access and Management Systems Accession No. ML17207A102), Duke Energy (the licensee) submitted information summarizing the results of the Spring 2017 steam generator (SG) tube inspections performed at McGuire Nuclear Station (McGuire), Unit 2 during its cycle 24 refueling outage. McGuire, Unit 2 has four Babcock and Wilcox International model CFR80 SGs that were installed in 1997. 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 have a triangular pitch of 0.930 inches and were hydraulically expanded at each end for the full depth of the 26.63-inch thick (without cladding) tubesheet.
The tubes are supported by Type 41 O stainless steel lattice grid supports.
The licensee provided the scope, extent, methods, and results of their SG tube inspections in the report referenced above. In addition, the licensee described corrective actions (i.e., tube plugging) taken in response to the inspection findings.
Based on a review of the information provided, the U.S. Nuclear Regulatory Commission (NRC) staff concludes that the licensee provided the information required by its 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:
A. Huynh, NRR Date: April 6, 201 8
SUBJECT:
MCGUIRE NUCLEAR STATION, UNIT 2 -REVIEW OF STEAM GENERATOR TUBE INSPECTION REPORT FOR THE CYCLE 24 REFUELING OUTAGE (EPID L-2017-LR0-0022)
DATED APRIL 6, 2018 DISTRIBUTION:
PUBLIC RidsNrrDorlLpl2-1 Resource RidsNrrLAKGoldstein Resource RidsACRS_MailCTR Resource RidsRgn2MailCenter Resource RidsNrrPMMcGuire Resource AHuynh, NRR AJohnson, NRR PKlein, NRR ADAMS A ccess1on N ML18089A608 o.: OFFICE NRR/DORL/LPL2-1/PM NRR/DORL/LPL2-1/LA NAME MMahoney KGoldstein DATE 04/04/18 04/02/18 OFFICE NRR/DORL/LPL2-1/BC NRR/DORL/LPL2-1
/PM NAME MMarkley MMahoney DATE 04/04/18 04/06/18 OFFICIAL RECORD COPY *b d ,v memoran um NRR/DMLR/MCCB/BC SBloom 03/27/18*