ML063610248
| ML063610248 | |
| Person / Time | |
|---|---|
| Site: | Catawba, McGuire  |
| Issue date: | 01/05/2007 |
| From: | Marinos E NRC/NRR/ADRO/DORL/LPLII-1 |
| To: | Gordon Peterson Duke Power Co |
| Marinos, EC, NRR/DORL 415-2911 | |
| References | |
| TAC MD0245 | |
| Download: ML063610248 (3) | |
Text
January 5, 2007 Mr. G. R. Peterson Vice President McGuire Nuclear Station Duke Power Company LLC 12700 Hagers Ferry Road Huntersville, NC 28078
SUBJECT:
MCGUIRE NUCLEAR STATION, UNIT 1, THIRD 10-YEAR INSERVICE INSPECTION INTERVAL PRESSURIZER LOWER HEAD TO SHELL WELD FLAW EVALUATION (TAC NO. MD0245)
Dear Mr. Peterson:
By letter dated January 9, 2006, Duke Power Company LLC (the licensee), submitted an evaluation of five circumferential indications located on the pressurizer lower head to shell weld for the McGuire Nuclear Station (McGuire), Unit 1. The licensee discovered the indications by ultrasonic examination during the units 17th refueling outage. The licensee intended to demonstrate through a flaw evaluation using the methods described in the American Society of Mechanical Engineers, Boiler and Pressure Vessel Code (ASME Code), paragraph IWB-3600 that the unit can be operated safely without repair of the subject weld for an additional 10 years.
The Nuclear Regulatory Commission (NRC) staff has completed its review of the flaw evaluation and found that the flaw evaluation meets the rules in Section XI of the ASME Code.
With a conservatively assumed flaw depth, the detected circumferential cracks in pressurizer lower head to shell weld will not reach the allowable flaw depth after 10 years of crack growth under the limiting loading condition (normal and upset). The NRC staff concludes that McGuire Unit 1 can be operated safely without repair of the subject weld for 10 years. As mentioned in the submittal, successive inspections at the flaw location will be conducted during the next inspection periods in accordance with IWB-2420, Successive Inspections, in Section XI of the ASME Code.
Sincerely,
/RA/
Evangelos C. Marinos, Chief Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-369 cc: See next page
ML063610248 NRR-106 OFFICE NRR/LPL2-1/PM NRR/LPL2-1/LA NRR/CFEB/SC NRR/LPL2-1/BC NAME JStang:nc MOBrien KGruss EMarinos DATE 01/03/2007 01/03/2007 01/03 /2007 1/5/2007
McGuire Nuclear Station, Units 1 & 2 cc:
Mr. G. R. Peterson Vice President McGuire Nuclear Station Duke Power Company LLC 12700 Hagers Ferry Road Hunterville, NC 28078 Ms. Lisa F. Vaughn Associate General Counsel and Managing Attorney Duke Energy Carolinas, LLC 526 South Church Street - EC07H Charlotte, North Carolina 28202 County Manager of Mecklenburg County 720 E. Fourth St.
Charlotte, NC 28202 Mr. C. Jeffrey Thomas Regulatory Compliance Manager Duke Energy Corporation McGuire Nuclear Site 12700 Hagers Ferry Road Huntersville, NC 28078 Senior Resident Inspector c/o U.S. Nuclear Regulatory Commission 12700 Hagers Ferry Road Huntersville, NC 28078 Dr. John M. Barry Mecklenburg County Department of Environmental Protection 700 N. Tryon St Charlotte, NC 28202 Mr. Peter R. Harden, IV VP-Customer Relations and Sales Westinghouse Electric Company 6000 Fairview Road, 12th Floor Charlotte, NC 28210 NCEM REP Program Manager 4713 Mail Service Center Raleigh, NC 27699-4713 Mr. Leonard G. Green Assistant Attorney General NC Department of Justice P.O. Box 629 Raleigh, NC 27602 Mr. R.L. Gill, Jr., Manager Nuclear Regulatory Issues &
Industry Affairs Duke Energy Corporation 526 S. Church St.
Mail Stop EC05P Charlotte, NC 28202 Division of Radiation Protection NC Dept of Environment, Health & Natural Resources 3825 Barrett Dr.
Raleigh, NC 27609-7721 Mr. T. Richard Puryear Owners Group (NCEMC)
Duke Energy Corporation 4800 Concord Road York, SC 29745 Mr. Henry Barron Group Vice President, Nuclear Generation
& Chief Nuclear Officer P.O. Box 1006-EC07H Charlotte, NC 28201-1006 Ms. Kathryn B. Nolan Senior Counsel Duke Energy Carolinas, LLC 526 South Church Street - EC07H Charlotte, NC 28202