ML20009F570
| ML20009F570 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 06/30/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8107310315 | |
| Download: ML20009F570 (2) | |
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OhlCIAL copy TENNESSEE VALLEY AUT.HORITY,..
CHATTANOOGA. TENNESSEE 374'o1
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400 Chestnut Street Tower II
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Mr. James P. O'Reilly, Director y
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Dear Mr. O'Reilly:
SEQUOYAH NUCLEAR PLANT UNIT 2 - FOA;I SEALS IN MECHANICAL PIPE SLEEVES -
SQRD-50-328/81 SECOND INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector R. V. Crlenjak on April 16, 1981, in accordance with 10 CFR 50.55(e) as NCR CEB 8108. Our first interim report was submitted on April 23, 1981. Enclosed is our second interim report. We expect to submit our next report by September 16, 1981.
If yoit have any questions, please get in touch with D. L. Lambert at FIS 857-2581.
Very truly yours, TENNESSEE VALLEY AUTHORITY 1.
L. M. Mills, Manager Nuclear Regulation and Safety Enclosure cc:
Mr. Victor Stello, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Conunission Washington, DC 20555 hl 8107310315 810630 PDR ADOCK 05000328 i
S PDR An Equal Opportunity Employer
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ENCLOSURE SEQUOYAHNUCLbARPLANT? NIT 2#
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FOAM SEALS II~ MECHANICAL PIPE SLEEVES SQRD-50-328/81-33 10 CFR 50.5S(e)
SECOND INTERIM REPORT Description of Deficiency Some wall penetration piping sleeves shown on TVA drawing series 47W470 and 47W471 have rigorously analyzed safety-related piping routed through them.
Silicone sealants are provided between the pipe and sleeve at certain locations as shown on TVA drawing series 47W472.
These seals have not been considered by the piping analyst for most cases and thereby could result in increases in pipe stresses and support loads for some situations; The maximum pipe movements at the sleeves may cause failure of the sealant to perform its intended design function as a pressure, water, radiation, and/or fire protection seal.
Interim Progress As stated in our last report, TVA has conducted tests which show that the silicone foam is flexible in tension, compression, and shear. Test results and vendor physical data indicate the silicone foam will not tear or rupture for anticipated pipe movements.
In cases where the pipe is not centered, the movement of the pipe ceuld tear the seal locally; however, a complete loss of a seal through a penetration is not likely. Therefore, this deficiency should not affect power operation.
-TVA is continuing its evaluation of the effects of the silicone foam seals on the pipe and on the seal itself.
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