ML18038B003
| ML18038B003 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 11/07/1994 |
| From: | Hebdon F Office of Nuclear Reactor Regulation |
| To: | Kingsley O Tennessee Valley Authority |
| References | |
| TAC-M90752, TAC-M90753, TAC-M90754 NUDOCS 9411100119 | |
| Download: ML18038B003 (6) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 November 7, 1994 Hr. Oliver D. Kingsley, Jr.
President, TVA Nuclear and Chief Nuclear Officer Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 SUBJECT BROWNS FERRY NUCLEAR PLANT UNITS 1, 2, AND 3 - ASHE CODE CASE N-504-1 (TAC NOS.
- M90752, H90753 AND M90754)
Dear Mr. Kingsley:
By letter dated October 28,
- 1994, the Tennessee Valley Authority (TVA) requested relief from certain requirements of Section XI of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code for the Browns Ferry Nuclear Plant (BFN) Units 1,
2, and 3.
Specifically, TVA requested that it be authorized to apply the provisions of ASME Code Case N-504-1 to perform weld overlay repairs of austenitic stainless
-steel piping.
In particular, TVA's submittal discussed application of this Code Case to a
weld overlay repair of a recirculation system piping weld (designated as GR-2-64) for BFN Unit 2.
Weld overlay reinforcement consists of applying weld metal over the weld and for a specified minimum distance on both sides of the weld.
TVA has designed the GR-2-64 weld overlay repair assuming that the original weld contains a
through-wall flaw throughout its circumference.
This is a conservative assumption which ensures the repair is capable of retaining the full piping load regardless of the integrity of the original weld.
Furthermore, the weld overlay process creates residual compressive stress within the original weld, and adds resistant
- material, which should inhibit further growth of the flaws'VA also provided a discussion of how each Code Case N-504-1 requirement would be satisfied for this repair.
Implementation of TVA's use of this Code Case may be subject to inspection by the NRC.
NBC ll:IIILlECENTER lMPV The NRC staff has reviewed TVA's submittal for the weld overlay repair of weld GR-2-64, and has concluded that this repair is sufficient to maintain the structural integrity of the weld under operating conditions, and that application of ASHE Code Case N-504-1 to BFN Unit 2 weld GR-2-64 as an alternative to the Code repair requirements provides an acceptable level of quality and safety.
Therefore, the NRC staff has determined that application of ASHE Code Case N-504-1 to BFN Unit 2 weld GR-2-64 is authorized, pursuant to 10 CFR 50.55a(a)(3)(i),
until such time as the Code Case is published in a
future revision of Regulatory Guide
- 1. 147.
At that time the licensee is to follow all provisions in Code Case N-504-1, with limitations issued in Regulatory Guide
- 1. 147, if any, if the licensee continues to implement this alternative repair.
O~0028 94111001 19 940101007259 pDR
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Hr. 0. Kingsley TVA also requested that ASME Code Case N-504-1 be approved for general application at BFN.
The staff does not accept unrestricted application of this Code Case at this time.
TVA should submit requests for relief on a case-by-case basis if it wishes to utilize Code Case N-504-1 before it is incorporated into Regulatory Guide
- 1. 147.
Please contact Joe Williams at (301) 504-1470 if you have any questions regarding this topic.
Sincerely, Original signed by Frederick J.
Hebdon, Director Project Directorate II-4 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation Docket Nos.
50-259, 50-260, and 50-296 cc:
See next page Distribution
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PUBLIC BFN Reading S.
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Mr. Oliver D. Kingsley, Jr.
Tennessee Valley Authority CC:
Mr. Craven Crowell, Chairman Tennessee Valley Authority ET 12A 400 West Summit Hill Drive Knoxville, TN 37902 Mr.
W.
H. Kennoy, Director Tennessee Valley Authority ET 12A 400 West Summit Hill Drive Knoxville, TN 37902 Mr. Johnny H. Hayes, Director Tennessee Valley Authority ET 12A 400 West Summit Hill Drive Knoxville, TN 37902 Mr. 0. J, Zeringue, Sr. Vice President Nuclear Operations Tennessee Valley Authority 3B Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Dr. Mark 0. Medford, Vice President Engineering
& Technical Services Tennessee Valley Authority 3B Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. D.
E.
Nunn, Vice President New Plant Completion Tennessee Valley Authority 3B Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. R.
D. Machon, Site Vice President Browns Ferry Nuclear Plant Tennessee Valley Authority P.O.
Box 2000
- Decatur, AL 35602 General Counsel Tennessee Valley Authority ET 11H 400 West Summit Hill Drive Knoxville, TN 37902 BROWNS FERRY NUCLEAR PLANT Mr. Roger W. Huston, Manager Nuclear Licensing and Regulatory Affairs Tennessee Valley Authority 4G Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801 Mr. T.
D. Shriver Nuclear Assurance and Licensing Browns Ferry Nuclear Plant Tennessee Valley Authority P.O.
Box 2000
- Decatur, AL 35602 Mr. Pedro Salas Site Licensing Manager Browns Ferry Nuclear Plant Tennessee Valley Authority P.O.
Box 2000
- Decatur, AL 35602 TVA Representative Tennessee Valley Authority 11921 Rockville Pike, Suite 402 Rockville, MD 20852 Regional Administrator U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW., Suite 2900
- Atlanta, GA 30323 Mr. Leonard D. Wert Senior Resident Inspector Browns Ferry Nuclear Plant U.S. Nuclear Regulatory Commission
'0833 Shaw Road
- Athens, AL 35611 Chairman Limestone County Commission 310 West Washington Street
- Athens, AL 35611 State Health Officer Alabama Department of Public Health 434 Monroe Street Montgomery, AL 36130-1701
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