ML20003H314
| ML20003H314 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 04/28/1981 |
| 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, SQRD-50-328-81, NUDOCS 8105050537 | |
| Download: ML20003H314 (2) | |
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Mr. James O'Reilly, Director
a Office of Inspection and Enforcement U.S. Nuclear Re' latory Comission Region II - Suite 100 101 Marietta Street Atlanta, Georgia 303
Dear Mr. O'Reilly:
SEQUOYAH NUCLEAR PLANT UNIT 2 - FOAM SEALS IN MECHANICAL PIPE SLEEVES -
SQRD-50-328/81 FIRST 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) r.4 NCR GB 8108. Enclosed is our first interim mport. We expect to submit our e mport by June 30, 1981.
If you have au; wct. Ms, please get in touch with D. L. Lambert at FTS 857-2581.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Regulation and Safety Enclosum
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Mr. Victor Stello, Director (Enclosure) V Office of Inspection and Enforcement U.S. Nuclear Regulatory Comiaissica
'4ashington, DC 20555
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W 8105050 3
a ENCLOSURE' SEQUOYAH NUCLEAR PLANT UNIT 2 FOAM SEALS IN MECHANICAL PIPE SLEEVES SQRD-50-328/81-30 10 CFR 50.55(e)
FIRST INTERIM REPORT Description of Deficiency Sone 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 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 could 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 has begun a progran to evaluate the effects of the silicone foam seals on the pipe and on the seal itself.
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