ML103430309
| ML103430309 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 12/21/2010 |
| From: | Kalyanam N Plant Licensing Branch IV |
| To: | Entergy Operations |
| Kalyanam N, NRR/DORL/LPL4, 415-1480 | |
| References | |
| TAC ME4017 | |
| Download: ML103430309 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 December 21,2010 Vice President, Operations Entergy Operations, Inc.
Waterford Steam Electric Station, Unit 3 17265 River Road Killona, LA 70057-3093
SUBJECT:
WATERFORD STEAM ELECTRIC STATION, UNIT 3 - REVIEW OF THE 2009 STEAM GENERATOR TUBE INSERVICE INSPECTION REPORT (TAC NO. ME4017)
Dear Sir or Madam:
By letter dated May 13, 2010 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML101370228), Entergy Operations, Inc. (the licensee), submitted information pertaining to the steam generator (SG) tube inspections performed during refueling outage 16 (fall 2009) at the Waterford Steam Electric Station, Unit 3. In addition to this report, the U.S. Nuclear Regulatory Commission (NRC) staff summarized two conference calls held with the licensee, concerning the 2009 SG tube inspections, in a letter dated January 7, 2010 (ADAMS Accession No. ML100050664). The licensee provided information in support of these calls in an e-mail dated November 12,2009 (ADAMS Accession No. ML093210496).
The NRC staff has completed its review of these reports and concludes that the licensee provided the information required by its technical specifications and that no additional follow-up is required. The staff's review of the reports is enclosed.
If you have any questions, please contact me at (301) 415-1480 or bye-mail at kaly.kalyanam@nrc.gov.
,ereIY, i
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N. Kalyanam, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-382
Enclosure:
As stated cc w/encl: Distribution via Listserv
REVIEW OF THE 2009 STEAM GENERATOR TUBE INSERVICE INSPECTION REPORT FOR WATERFORD STEAM ELECTRIC STATION, UNIT 3 DOCKET NO. 50-382 By letter dated May 13, 2010 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML101370228), Entergy Operations, Inc. (the licensee), submitted information pertaining to the steam generator (SG) tube inspections performed during refueling outage 16 (fall 2009) at the Waterford Steam Electric Station, Unit 3 (Waterford 3). In addition to this report, the U.S. Nuclear Regulatory Commission (NRC) staff summarized two conference calls held with the licensee, concerning the 2009 SG tube inspections, in a letter dated January 7,2010 (ADAMS Accession No. ML100050664). The licensee provided information in support of these calls in an e-mail dated November 12, 2009 (ADAMS Accession No. ML093210496).
Waterford 3 has two Model 70 SGs designed and fabricated by Combustion Engineering. The mill-annealed Alloy 600 SG tubes have an outside diameter of 0.750 inches and a nominal wall thickness of 0.048 inches. Each SG contains 9,350 tubes. The tubes are explosively expanded for the full depth of the tubesheet at each end and are supported by a number of carbon steel lattice-grid (i.e., eggcrate) tube supports, diagonal bars (also referred to as batwings), and vertical straps. The tubes in rows 1 through 18 are U-bends and the tubes in rows 19 through 147 are square bends. The upper end of the batwings are connected by a double-sided weld to a wrap around bar located in the periphery of the tube bundle. The center region of the tube bundle contains no tubes and is referred to as the stay-cavity region.
The licensee provided the scope, extent, methods, and results of its SG tube inspections in the documents referenced above. In addition, the licensee described corrective actions (e.g., tube plugging) taken in response to the inspection findings.
Degradation of the batwings in the stay cavity region was first observed in 2005 in one of the steam generators. This degradation is summarized in the NRC Information Notice 2005-29, "Steam Generator Tube and Support Configuration." Additional batwing degradation has been detected in subsequent outages. The degradation of the batwings led to several corrective actions including stabilizing and plugging many tubes, additional analyses, and enhanced inspections in this region. Additional details regarding the extent of batwing degradation during the 2009 outage is contained in the information provided by the licensee. The SGs at Waterford 3 are scheduled for replacement during their next refueling outage (scheduled for spring 2011). As a result, the 2009 inspections were the last planned inspections for these SGs.
The NRC staff has completed its review of these reports and concludes that the licensee provided the information required by its technical specifications and that no additional follow-up is required.
Enclosure
December 21,2010 Vice President, Operations Entergy Operations, Inc.
Waterford Steam Electric Station, Unit 3 17265 River Road Killona, LA 70057-3093 SUB~IECT:
WATERFORD STEAM ELECTRIC STATION, UNIT 3 - REVIEW OF THE 2009 STEAM GENERATOR TUBE INSERVICE INSPECTION REPORT (TAC NO. ME4017)
Dear Sir or Madam:
By letter dated May 13, 2010 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML101370228), Entergy Operations, Inc. (the licensee), submitted information pertaining to the steam generator (SG) tube inspections performed during refueling outage 16 (fall 2009) at the Waterford Steam Electric Station, Unit 3. In addition to this report, the U.S. Nuclear Regulatory Commission (NRC) staff summarized two conference calls held with the licensee, concerning the 2009 SG tube inspections, in a letter dated January 7, 2010 (ADAMS Accession No. ML100050664). The licensee provided information in support of these calls in an e-mail dated November 12, 2009 (ADAMS Accession No. rvIL09321 0496).
The NRC staff has completed its review of these reports and concludes that the licensee provided the information required by its technical specifications and that no additional follow-up is required. The staffs review of the reports is enclosed.
If you have any questions, please contact me at (301) 415-1480 or bye-mail at kaly.kalyanam@nrc.gov.
Sincerely, IRA by Lynnea Wilkins forI N. Kalyanam, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-382
Enclosure:
As stated cc w/encl: Distribution via Listserv DISTRIBUTION:
PUBLIC RidsNrrDorlDpr Resource RidsOgcRp Resource LPLIV R/F RidsNrrDorlLpl4 Resource RidsRgn4MailCenter Resource RidsAcrsAcnw_MailCTR Resource RidsNrrPMWaterford Resource KKarworski, NRRIDCI/CSGB RidsNrrDciCsgb Resource RidsNrrLAJBurkhardt Resource AJohnson, NRRIDCI/CSGB ADAMS Accession No. ML103430309
'SE Input from CSGB OFFICE DORULPL4/PM DORLlLPL4/LA NRRIDCI/CSGB DORLlLPL4/BC DORULPL4/PM NAME NKalyanam (LWilkins for)
JBurkhardt RTaylor' MMarkley NKalyanam (LWilkins for)
DATE 12/21/10 12/14/10 12/7/10 12/21/10 12/21/10 OFFICIAL RECORD COpy