ML20028B691
| ML20028B691 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 11/29/1982 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-82 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8212030152 | |
| Download: ML20028B691 (2) | |
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TENNES!3EE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 374ot 400 Chestnut Street Tower II November 29, 1982 BLRD-50-438/82-64 BLRD-50-439/82-57 i
's No U.S. Nuclear Regulatory Commission
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Region II "T
Attn:
Mr. James P. O'Reilly, Regional Administrator
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101 Marietta Street, Suite 3100
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Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - DESIGN PROBLEMS WITH STEAM GENERATORS - BLRD-50-438/82-64, BLRD-50-439/82 SECOND INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector D. Quick on August 30, 1982 in accordance with 10 CFR 50.55(e) as NCR BLN NEB 8210. This was followed by our first interim report dated September 28, 1982. Enclosed is our second interim report. We expect to submit our next report by January 31, 1983 We consider 10 CFR Part 21 applicable to this deficiency.
If you have any question's concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, thnager i
Nuclear Licensing i
Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commissicn Washington, D.C.
20555 Mr. James McFarland (Enclosure)
Senior Project Manager Babcock & Wilcox Company P.O. Box 1260 g
Lynchburg, Virginia 24505 t
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8212030152 821129 PDR ADOCK 05000438 s
PDR An Equal Opportunity Emptover
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AHD 2 DESIGN PROBLEMS WITH STEAM GENERATORS NCR BLN NEB 8210 BLRD-50-438/82-64, BLRD-50-439/82-57
- 10. CFR 50.55(e)
SECOND INTERIM REPORT Description of Deficiency At the July 27, 1982 Babcock & Wilcox (B&W) Owner's Group Meeting, B&W (Lynchburg, Virginia) indicated that recent inspections of steam generators (SGs) at 177FA B&W operating plants revealed deformation of the auxiliary feedwater ( AFW) header and damage fto the header supports. There was also evidence of contact between th'e header and some adjacent SG tubes. The Bellefonte header design is similar to the 177FA plant design except that AFW is introduced to header in the lower portion of the SG (beneath the steam outlet nozzles) whereas the 177FA plant headers are toward the top of the SG (in the superheat region).
Investigations are in progress to determine the chuse of these conditions. The postulated cause of the deficiency was a sudden drop of the header internal pressure resulting from the injection of a cold slug of AFW into the header while the header was dry.
Bellefonte is the only TVA nuclear plant with a B&Wasupplied NSSS.
Interim Progress B&W and TVA are still investigating the possibility of adding an external AFW header. TVA will provide further input upon evaluation of this option.
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