ML20044G832
| ML20044G832 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 05/24/1993 |
| From: | Fenech R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9306040328 | |
| Download: ML20044G832 (4) | |
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Tennessee Vdey Authonty. Post Ottice Bow 2000. Soddy-Daisy. Tennessee 37379 2000 Robert A. Fenech Mce President, Sequoyan Nuclear Plant May 24, 1993 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:
In the Matter of
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Docket Nos. 50-327-Tennessee Valley Authority
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50-328 SEQUOYAH NUCLEAR PLANT (SQN) - AUTHORIZATION TO USE AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME) BOILER AND PRESSURE VESSEL (B&PV)' CODE-CASE N-389 Enclosed is a copy of ASME Code Case N-389 that.was approved by ASME on July 25, 1983. TVA has reviewed the applications of the code case and plans to apply it in conjunction with its ASME Section XI Repair and Replacement Program by implementing ASME Section XI, 1986 Edition through the 1986 Addenda for the purpose of installing welded tube plugs in steam generator (S/G) tubesheets.'
TVA plans to remove two tubes from S/G No. 3 for the purpose of analysis of tube failures in order to take the appropriate corrective measures to
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ensure the life and operability of the S/G. The tube pulling and subsequent tube plugging by welding are emergent work from the-in-service inspection of the SQN Unit 1 S/Gs. When the tube is removed,'al welded tube plug will be Installed employing automated welding techniques. This' method of welding is used for significant dose reduction as it eliminates the requirement for individuals to remain inside the high-radiation field in the S/G primary channel head. This method of welding also has been demonstrated to produce a quality weld to TVA and the third-party' inspector employed at SQN.
Since ASME Section XI, 1986 Edition through the 1986 Addenda,..
Subsection IWB-4000, is the first code that addresses _the use of this.
j type of machine welding, TVA requested approval to adopt this code only.
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~for the purposes of performing repairs of this nature. All other ASME Section XI repair and replacement activities will be performed to
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U.S. Nuclear Regulatory Commission Page 2 May 24, 1993~
ASME Section XI, 1980 Edition through the 1981 Winter Addenda, which is the code of record for SQN. Verbal authorization to use this code case j
was provided by Herb Conrad of your staff on May 24, 1993, since we were in the process of restoring the unit's reactor coolant system.
Please direct questions concerning this issue to J. D. Smith at (615) 843-6672.
Sincerely, e
Robert A. Fenech Enclosure cc (Enclosure):
Mr. D. E. LaBarge, Project Manager U.S. Nuclear Regulatory Commission l
One White Flint, North
.y 11555 Rockville Pike Rockville, Maryland 20852-2739 NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road l
Soddy-Daisy, Tennessee 37379-3624 Regional Administrator U.S. Nuclear Regulatory Commission Region II i
101 Marietta Street, NW, Suite 2900 l
Atlanta, Georgia 30323-2711
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O DiCLOSURE AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME)
BOILER AND PRESSURE VESSEL CODE CASE N-389 i
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CASE 1
4 N-389 CASES OF ASME BOII.ER AND PRESSURE VISSEL CODE Approva! Date: July 25,1983 See Numeric index for expiradon and any restfirmatfors dates.
f Case N.389 I
Alternative Rules for Repairs Replacements, or Mo in+1ons a
Section XI, Division 1 i
Inguirp When mahng a repair.* replacement, or I
- w.'iScation in acco: dance with the requi=nt::ts Of Sectics XI. Divisica I, which Editions and Addenda of Se: tion XI may be used as an alte: native to those specided in the Owner's Inse:vice Inspection Program?
I Repip 11is the opinien of the C*mh that Edi-tions and Addenda of S& XI, Division I, subsc-l quent to those specz5ed in the Owner's Inservice In-i spec: ion Program may be used for repair, replacement, er modi 5:stion, p cvided the Edition and Addenda have been accepted by the enforcement zad regulatory autho:ities having jurisdic: ion at the plant site.
This Case number shall be shown on the h73 2, Form.
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