ML20072E260
| ML20072E260 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 03/15/1983 |
| 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 8303210626 | |
| Download: ML20072E260 (2) | |
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TENNESSEE VALLEY AUTHORITY 1
NRC'REGtON..
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- 7* A N TA. U C aindiA 400 Chestnut Street Tower II March 15, 1983 83 MAR 17 A 9 ; O BLRD-50-438/82-59 BLRD-50-439/82-53 U.S. Nuclear Regulatory Commission 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 - USE OF FILLET WELDS ON PIPING LUGS - BLRD-50-438/82-59, BLRD-50-439/82 THIRD INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector R. V.
Crlenjak on August 19, 1982 in accordance with 10 CFR 50.55(e) as NCR GEN CEB 8209. This was followed by our interim reports dated Septmber 20, 1982 and January 19, 1983. Enclosed is our third interim report. We expect to submit our next report on or about May 18, 1983. A final report is being submitted separately on this NCR for the Watts Bar Nuclear Plant.
If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Ma ager Nuolear Licensing Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. IGlolear Regulatory Cornission Washington, D.C.
20555 OFFlCl AL COQ..d r303210626 830315 PDR ADOCK 05000438 lSY An Equal Opportunity Employer
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 USE OF FILLET WELDS ON PIPING. LUGS BLRD-50-438/82-59, BLRD-50-439/82-53 10 CFR 50.55(e)
THIRD INTERIM REPORT Description of Deficiency Fillet welds have been used to attach lugs to piping at Bellefonte.
These lugs are permanent integral attachments on mechanical piping and are designed to provide support or to retain movement axially.or laterally. At Bellefonte, the lugs were designed by both ITT Grinnell and TVA. While use of fillet welded lugs is allowed by the ASME Code, TVA's Civil Engineering Support Brar.ch was concerned that TVA had no specific design document to qualify piping with fillet welded lugs and that their design document, CEB report 76-20, was being used even though it requires the use of full penetration welds.
Interim Progress
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TVA has determined that the vendor's designs were based on their own design standards and not on CEB report 76-20. Those lugs designed by the vendor, ITT Grinnell, are limited to rigorously analyzed piping greater than 2.0 inches in diameter. These vendor-designed fillet-welded lugs are adequate as is.
At Bellefonte, fillet-welded lugs were designed by TVA personnel for rigorously analyzed piping less than 2.5 inches in diameter and for various alternately analyzed piping. TVA has determined that the stress margins in CEB report 76-20 exceed the additional design stresses required by the use of the fillet-welded lugs, and that the fillet-welded lugs are acceptable as is. Documentation efforts concerning qualification of these lugs and a calculation package is currently in progress and TVA will provide additional information for this item in our next report.
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