ML20063N688
| ML20063N688 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 09/28/1982 |
| 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, NCR-NEB-8210, NUDOCS 8210050407 | |
| Download: ML20063N688 (1) | |
Text
r-TENNESSEE VALLEY AUTHORITY Ct'ATTANOOGA, TENNESSEE 374ot 400 Chestnut Street Tower II September 28, 1982 BLRD-50-438/82-64 BLRD-50-439/82-57 U.S. Nuclear Regulatory Coinnission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
La BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - DESIGN PROBLEMS WITH STEAM
)
GENERATORS - BLRD-50-438/82-64, BLRD-50-439/82 FIRST INTERIM REPORT nO
- ~ g to iT 2 C
so 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 2
BLN NEB 8210. Enclosed is our first interim report. Weexpecttosubm{f~
am our next report by November 29, 1982. We consider 10 CFR Part 21
[79 applicable to this deficiency.
y "l p If you have any questions concerning this matter, please get in touch with
?
R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, ager Nuclear Licensing Enclosure oc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 l
Mr. James McFarland (Enclosure)
Senior Project Manager Babcock & Wilcox Company l
P.O. Box 1260 Lynchburg, Virginia 24505 l
l vrriCIALCd h0gCK05000407 820928
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An Equal Opportunity Employer
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 DESIGN PROBLEMS WITH STEAM GENERATORS NCR NEB 8210 BLRD-50-438/82-64, BLRD-50-439/82-57 10 CFR 50.55(e)
FIRST 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 to the header supports. There was also evidence of contact between the header and some adjacent SG tubes. 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. The Bcllefonte 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 cutlet nozzles) whereas the 177FA plant headers are toward the top of the SG (in the superheat region).
Bellefonte is the only TVA nuclear plant with a B&W-supplied NSSS.
Interim Progress B&W has proposed a preliminary design change to mitigate the problem by injecting warm feedwater into the header and keeping the header full of water. B&W and TVA are exploring various possible fixes and are in the process of determining the cause of this deficiency.
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