ML20053C176
| ML20053C176 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 05/18/1982 |
| 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 8206010549 | |
| Download: ML20053C176 (2) | |
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,I,/,SNgg TENNESSEE VALLEY AUTHORITY p-
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May 18, 1982 0J BLRD-50-438/82-05 BLRD-50-439/82-05 U.S. Nuclear Regulatory Commission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - SEISMIC SUPPORT LU0S ON 2-INCH OR LESS STAINLESS STEEL PIPE BLRD-50-438/82-05, BLRD-50-439/82 THIRD INTERIM REPORT The subject deficiency was initially reported to NRC-OIE Inspector R. V. Crlenjak on December 24, 1981 in accordance with 10 CFR 50.55(e) as NCR 1690. This was followed by our interim reports dated January 21 and March 23, 1982. Enclosed is our third interim report. We expect to submit our next report by August 13, 1982.
If you have any questions concerning this matter, please get in touch with R. H. Shell at FIS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, hger Nuclear Licensing Enclosure oc:
Mr. Richard C. DeYoung, Director (Enclosure)
' Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 OFFICIAL $E' 8206010 M.s T E 42 -f An Equal Opportunity Employer
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4 ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 SEISMIC SUPPORT LUGS ON 2-INCH OR LESS STAINLESS STEEL PIPE NCR 1690 BLRD-50-438/82-05, BLRD-50-439/82-05 10 CFR 50 55(e)
THIRD INTERIM REPORT Description of Deficiency Because of the relatively large amount of weld required for lug attachment, it is suspected that stainless steel pipe (2-inch diameter and less) in the areas where lugs are attached may not meet ASME Code parts NB, NC, and HD-4200 ovality tolerances and may exhibit burn-through or oxidation.
Interim Progress Ei ht 5-inch long weld mockups using seismic lugs 1/4" by 1/2" by 2" d
long and type 304 stainless steel schedule 40 pipe were forwarded to Singleton Materials Laboratory for metallurgical evaluation. These consist of duplicate sets of four, which include 2, 1-1/2, 1 and 1/2" nominal diameter pipe. One of the sets has been cut longitudinally for examination of inside surfaces.
These sections were cut from mockups originally 1S" long to provide a pipe length constraint, as opposed to previous mockups welded in 5" lengths. The ends of the mockups were covered by.1/8" thick plate sections before welding (by tack welding) to prevent visual inside access during welding.
In addition to the above mockups, four standard butt welds of identical pipe material of the above diameters were forwarded to Singleton Materials Laboratory for evaluation.
TVA is still in the process of evaluating the subject deficiency.
Singleton Materials Laboratory is examining the weld mockups and will be able to supply more information when these examinations are complete.
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