ML20148S796
| ML20148S796 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 06/30/1997 |
| From: | Kennedy J NRC (Affiliation Not Assigned) |
| To: | Cottle W HOUSTON LIGHTING & POWER CO. |
| References | |
| TAC-M95401, TAC-M95402, NUDOCS 9707080314 | |
| Download: ML20148S796 (5) | |
Text
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ad June 30,~1997 Mr. William T. Cottle-Group Vice-President, Nuclear Houston Lighting & Power Company
]
South Texas Project Electric Generating Station j
P. O. Box 289 Wadsworth, TX 77483
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION - SOUTH TEXAS PROJECT, UNITS 1 AND 2 (TAC NOS. M95401 AND M95402) i
Dear Mr. Cottle:
The staff has reviewed your application for amendment dated June 14, 1996, as supplemented March 17, 1997, to allow the use of laser-welded sleeving for defective steam generator tube repair at the South Texas Project, Units 1 and 2.
Your response to the enclosed request for additional information within 30. days is needed for the staff to continue to process your request.
If you have any questions regarding this request, please contact me at (301) l 415-3267.
Sincerely, ORIGINAL SIGNED BY:
Janat L. Kennedy, Project Manager Project Directorate IV-1 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation Docket Nos. 50-498 and 50-499
Enclosure:
Reque'st for Additional Information cc w/ encl: See next page DISTRIBUTION:
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DATE
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NUCLEAR REQULATORY COMMISSION I*
2 WASHINGTON, D.C. 20066 4001 i
June 30, 1997
?
d Mr. William T. Cottle Executive Vice-President &
General Manager, Nuclear Houston Lighting & Power Company j
South Texas Project Electric l
Generating Station i
J P. O. Box 289 Wadsworth, TX 77483 1
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION - SOUTH TEXAS PROJECT, UNITS 1 i
AND 2 (TAC NOS. M95401 AND M95402) j
Dear Mr. Cottle:
i The staff has reviewed your application for amendment dated June 14, 1996, as supplemented March 17, 1997, to allow the use of laser-welded sleeving for j
defective steam generator tube repair at the South Texas Project, Units 1 and 2.
Your response to the enclosed request for additional information within 30 days is needed for the staff to continue to process your request.
If you have any questions regarding this request, please contact me at (301) 415-3267.
1 Sincerely, i
i h
Janet L. Kennedy, Project Manager t
Project Directorate IV-1 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation Docket Nos. 50-498 and 50-499 l
Enclosure:
Request for Additional Information J
cc w/ enc 1: See next page 5
i 4
Mr. William T. Cottle
. Houston' Lighting & Power Company South Texas, Units 1 & 2 f
cc:
Mr. David P. Loveless Jack R. Newman, Esq.
Senior Resident Inspector Morgan, Lewis & Bockius U.S. Nuclear Regulatory Commission 1800 M Street, N.W.
P. O. Box 910 Washington, DC 20036-5869 Bay City, TX 77414 i
Mr. Lawrence E. Martin Mr. J. C. Lanier/M. B. Lee General Finager, Nuclear Assurance Licensing City of Austin Houston Lighting and Power Company Electric Utility Department P. O. Box 289 721 Barton Springs Road Wadsworth, TX 77483 Austin, TX 78704 Rufus S. Scott Mr. M. T. Hardt Associate General Counsel Mr. W. C. Gunst Houston Lighting and Power Company City-Public Service Board P.-0. Box 61867 P. O. Box 1771 Houston, TX 77208 San Antonio, TX 78296 Joseph R. Egan, Esq.
Mr. G. E. Vaughn/C. A. Johnson Egan & Associates, P.C.
Central. Power and Light Company 2300 N Street, N.W.
P. O. Box 289 Washington, DC 20037 Mail Code: N5012 Wadsworth, TX 74483 Office of the Governor ATTN: Andy Barrett, Director INPO-Environmental Policy Records Center P. O. Box 12428 700 Galleria Parkway Austin, TX 78711 Atlanta, GA 30339-3064 Arthur C. Tate, Director Regional Administrator, Region IV Division of Compliance & Inspection U.S. Nuclear Regulatory Commission Bureau of Radiation Control 611 Ryan Plaza Drive, Suite 400 Texas Department of Health Arlington, TX 76011 1100 West 49th Street Austin, TX 78756 Dr. Bertram Wolfe 15453 Via Vaquero Texas Public Utility Commission Monte Sereno, CA 95030 ATTN: Mr. Glenn W. Dishong 7800 Shoal Creek Blvd.
Judge, Matagorda County Suite 400N Matagorda County Courthouse Austin, TX 78757-102.4 1700 Seventh Street Bay City, TX 77414 1
RE0 VEST FOR ADDITIONAL INFORMATION REGARDING PROPOSED AMENDMENT TO ALLOW l
LASER WELDED SLEEVING l
1.
The staff understands that the South Texas Project (STP) plans to perform post weld heat treatment (PWHT) of the sleeve laser welds. The PWHT is not explicitly required in the generic topical slee.ve report nor is it in the STP-specific topical sleeve report.
Since commitments outside the Technical Specifications (TS) are subject to change under 10 CFR 50.59, the. staff requests STP place the PWHT commitment in the TS. As an alternative, submit an evaluation for staff review and approval of why it is acceptable to nol perform the PWHT.
2.
Recent experience at the Kewaunee plant indicates that visual test (VT) examinations of welded freespan joints may detect significant process-induced defects not detectable or resolvable by ultrasonic tests (UT) or eddy current (EC) examinations. The topical reports do not require a VT of the freespan welds.
Please provide the details of the nondestructive examination qualification efforts that justify the use of UT and EC inspections, without a VT, as a sufficient means to demonstrate acceptable sleeve weld quality.
3.
The staff understands that STP plans to use the Cecco-5 EC probe to inspect the sleeve welds as part of the sleeve installation acceptance process.
a.
Discuss how any and all EC indications will be dispositioned.
b.
WCAP-14653 discusses the use of the Cecco-5 probe to detect various process anomalies such as blow holes and weld cracking as well as to detect the presence of a PWHT.
Provide a description of how the Cecco-5 was qualified for these specific applications.
c.
Recent experiences at Maine Yankee indicate the Cecco-5 probe is not as sensitive to weld indications as the Plus Point probe.
Discuss how this issue applies to STP's plans for inspection of the sleeve welds.
Discuss why the use of the Cecco-5 probe as your installation acceptance tool is acceptable.
4.
At Maine Yankee, EC indications in the sleeve welded joints were detected using the Plus Point probe during sleeve inspections in 1997.
Currently, there are no plans to perform metallurgical evaluations of pulled sleeve / tube assemblies that had EC indications.
Thus the cause of the EC indications is unknown.
For example, it is not conclusively known whether the indications are process-induced or service-induced degradation. The structural and leakage integrity of the sleeve welds with these indications is also unknown. Discuss how this issue applies to STP and include in your discussions how STP plans to respond to this issue.
ENCLOSURE-l
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The staff understands that tests will be performed at Unit 2 to confirm the lower rolled joint provides adequate pullout resistance and primary-to-secondary leakage resistance.
a.
Describe confirmatory tests (e.g., number of samples, applied pressure differentials, hold times, leakago measurement techniques, j
etc.).
Include in your description how the results will be evaluated and applied to STP.
b.
Discuss specific actions to be taken by STP in the event the confirmatory test results invalidate previous structural or leakage qualification tests or the sleeve installation process.
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l
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