ML20080G350
| ML20080G350 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 08/29/1983 |
| 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 8309200234 | |
| Download: ML20080G350 (2) | |
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T TENNESSEE VALLEY AUTHORITY
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Ayf/A>,p*7/g, s'Rc CHATTANOOGA. TENNESSEE 374o1 400 Chestnut Street Tower II c lic,-
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August 29,1 BLRD-50-438/83-48 BLRD-50-439/83-40 U.S. Nuclear Regulatory Comission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - HEAT TRACING TAPE LEFT ON PIPING VIOLATES G-29M - BLRD-50-438/83-48, BLRD-50-439/83 FIRST INTERIM REPORT The subject deficiency was initially repor ed to NRC-0IE Inspector Linda Watson on July 29, 1983 in accordance with 10 CFR 50.55(e) as NCR 2424. Enclosed is our first interim report. We expect to
. submit our next report by November 10, 1983 If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY
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L. M. Mills, Manager Nuclear Licensing Enclosure cc: Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Comission Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 150')
Atlanta, Georgia 30339 8309200234 830829
'NY gDRADOCK 05000438 PDR
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1983-TVA SOTH ANNIVERSARY An Equal Opportunity Employer
o ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS.1 AND 2 HEAT TRACING TAPE LEFT ON PIPING VIOLATES G-29M NCR 2424 BLRD-50-438/83-48, BLRD-50-439/83-40 10-eFR 50.55(e)
FIRST INTERIM REPORT Description of Deficiency Two types of adhesive tape have been used to permanently attach heat tracing to stainless steel. instrument tubing. In the past, General Construction Specification G-29 has required the removal of all adhesive tapes prior to system operation due to the possibility of stress corrosion cracking caused by leachable halogens. However, vendor drawings have shown that the heat tracing tape may be left on permanently.
Interim Progress If heat tracing tapes can be shown to meet stringent requirements similar to those req 2 ired of thermal insulation per Regulatory Guide 1 36, then the tape can be left on stainless steel tubing or piping. The requirements these tapes must meet are that they have total halogen contents less than 1,000 ppm with leachable halogen contents less than 100 ppm and that they are qualified via a modified Dana Wicking Test. In the modified Dana
'ficking Test, tapes are applied '- U-5m.d -ttiniens steel cerre:10n cracking samples that have been heavily sensitized. These samples are then exposed to boric acid solutions at 2000F in a wicking environment of purified glass wool for 28 days. If no cracking of the U-bends is observed, the tape qualifies. Such testing en fiberglass reinferced and aluminum tapes involved with NCR 2424 has been started at Singleton Labora tory. The results of the Singleton Laboratory testing will be provided in TVA's next report.
General Construction Specification G-29 has been revised to allow the permanent application of pressure sensitive adhesive tapes for attaching heat tracing when it meets the above described required chemistry and qualification via the modified Dana Wicking Test.
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