ML20091D990
| ML20091D990 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 04/03/1992 |
| From: | Joshua Wilson TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9204130251 | |
| Download: ML20091D990 (2) | |
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April 3, 1992 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 SEQUOYAll NUCLEAR PLANT (SQN) - REVISED INFORMATION FOR THE MAIN FEEDWATER REQUEST FOR RELIEF FROM THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME), SECTIOJ XI, HYDROSTATIC PRES $URE TEST REQUIREMENTS
Reference:
Letter f rom TVA to NRC dated March 23, 1992. "Sequoyah Nuclear. Plant (SQN) - Request for Relief From the American Society of Mechanical Engineers (ASME).Section XI, Hydrostatic Pressure Test Requirements" The above reference requested relief frem the ASME code for performance of a hydrostatic test as a result of repairs to the main feedwater system. The above reference also stated that as a result of a
.through-wall crack in the feedwater nozzle transition piece to Steam Generator (SG) No. 3. a replacement of the transition piece would be necessary. TVA has since elected to replace both the transition piece and associated elbow tor all four SGs on both units.
In addition. Enclodure 1 provided a description of the maintenance activity that had been planned for the replacement of the elbow and transition piece. 'This description provided detailed information in regard to the weld material and type. TVA has since decided to use Welding Services. Inc., to perform thr balance of this work.
Accordingly, the description provided in the above reference is still applicable to SG Loops 2 and 34 but, for Loops 1 and 4, the f ollowing supplemental information is provided:
The three welds joining the nozzle to transition piece (P3 to P3) the transition piece to elbow (P3 to P1), and the elbow to riser (P1 to P1) will be welded with_the automatic gas tungsten are ptocess. The nozzle j/
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U.S. Nuclear Regulatory Commission Page 2 April 3, 1992 to transition piece will be an ope.1 root configuration utilizing SFA 5.28, Class ER 80S-C, tiller material. The remaining two welds utilize SFA 5.18, Class ER70S-3, and will be performed using an open root or consumable insert (SFA 5.30, INMS2) based on fit-up tolerances.
In addition, TVA may use Welding Services for the similar replacements to
-be performed on Unit 2.
Thus, the above information would be applicable for repairs on the Unit-2 SG loops, should TVA elect to use Welding Services.
Please direct questions concerning this issue to J. D. Smith at (615) 843-6672.
Sincerely,
. L. Wilson ces Mr. D. E. LaBarge, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike
.Rockville, Maryland 20852 NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy Tennessee 37379 Mr. B. A. Wilson, Project Chief U.S. Nuclear _ Regulatory Commission Region II 101 Marietta Street, NW,_ Suite 2900 Atlanta, Georgia 30323 7
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