ML20066K440
| ML20066K440 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 11/18/1982 |
| 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 8211290546 | |
| Download: ML20066K440 (2) | |
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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 400 Chestnut Street Tower II November 18, 1982
.3o U.S. Nuclear Regulatory Consnission
.Z Region II
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Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, Suite 3100 in Atlanta, Georgia 30303 go/N 2.
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Dear Mr. O'Reilly:
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BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - FAILURE OF MAIN STEAM LINES BECAUSE OF MAIN FEEDWATER OVERFILL - NCR BLN NEB 8004 - EIGHTH INTERIM REPORT On March 19, 1980, Bruce Cochran, NRC-0IE Region II, was informed that the subject nonconformance was determined to be reportable in accordance with 10 CFR 50.55(e). This was followed by our interim reports dated April 17, September 23, and December 29, 1980, June 25 and December 28, 1981, and March 31 and August 27, 1982. Enclosed is our eighth interim report. We expect to submit our next report by March 28, 1983 We consider 10 CFR Part 21 to be applicable to this nonconformance.
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 cc:
Mr. Pichard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. James McFarland (Enclosure)
Senior Project Manager Babcock & Wilcox Company P.O. Box 1260 Lynchburg, Virginia 24505 OFFICIAL' OWS C
[b Y 8211290546 821118 PDR ADOCK 05000 S
An Equal Opportunity Employer
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 FAILURE OF MAIN STEAM LINES BECAUSE OF MAIN FEEDWATER OVERFILL-NCR BLN NEB 8004 10 CFR 50.55(e)
EIGHTH INTERIM REPORT
\\ S Description of Deficiency; s a A preliminary safety concern, PSC 35-79, was initiated within B&W, Lynchburg, Virginia, which presents the concern that a potential exists for overfilling steam generators by excessive addition of main feedwater (MFW) or auxiliary feedwater ( AFW).
Excessive feedwater addEtion, as used here, is defined as a condition which would exist if feedwater (main or auxiliary) is continually added to the steam generators in en unplanned fashion at a rate greater than the c} ore heat generation capability for converting it to steam. Overfill, the condition addressed in this preliminary safety concern, may be defined as a limiting case of excessive feedwater addition which allows liquid spillage into the steam lines.
It is estimated that the time to overfill the integral economizer once-through steam generators (IE0TSG) provided on the Bellefonte Nuclear Plant is approximately 2 to 4 minutes with MFW and between 7 to 15 minutes with AFW.
Potential results of overfill could be:
1.
Steam line deformation and failure because of water accumulation.
2.
Steam generator blowdown because of steam line failure with the potential for core return to power from a safe shutdown condition,.
excessive steam generator tube stress, exceeding reactor vessel NDT limits, or contairment overpressurization.
Interim Progress i
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i TVA's preliminary analysis shows that the main steam lines can withstand the HFW overfill event, thus, there appears to be no problem. TVA is in the process of finalizing the analysis and more information will be j.
forwarded in the next report.
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