ML20094N881
| ML20094N881 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 07/25/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8408160434 | |
| Download: ML20094N881 (2) | |
Text
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_g TENNESSEE.VALL.EY ' AUTHORITY '
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CHATTANOOGA. TENNESSEE'374ot 400. Chestnut Street Tower II~
' July 25,!19841
,f30lA n.
BLRD-50-438/84-42 ELRD-50-439/84-38 U.S. Nuclear Regulatory Commission
' Region II
- Attn: ; - Mt'. James P. O'Reilly, Regional Administrator.
101 Marietta Street,.NW, Suite 2900 Atlanta, Georgia 30323-
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Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2
- CONTROL ROOM. PRESSURIZATION B'0UNDARY.
LOSS THROUGH DRAIN AND VENT LINES - BLRD-50-438/84-42, BLRD-50-439/84 FIRST
,m INTERIM REPORT-
- The subject deficiency was initially reported to NRC-0IE Inspector..
P. E. Fredrickson on June 25, - 1984_ in accordance with.10. CFR 50.55(e) as NCR BLN BLP 8407. Enclosed is our first interim report. We expect:to~
submit our next report on or about February 15, 1985.s If you have any questions,. please get in touch with R. H. Shell at FTS 858-2688.
Very truly~yours, TENNESSEE VALLEY AUTHORITY
. MWJ4 L. M. Mills, banager Nuclear Licensing Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission '
Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 8408160434 840725 OFFICIAI COPY PDR ADOCK 05000438 S
. An Equal Opportunity Employer p
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ENCLOSURE
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BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 CONTROL ROOM PRESSURIZATION BOUNDARY LOSS THROUGH DRAIN AND VENT LINES BLRD-50-438/84-42, BLRD-50-439/84-38 NCR BLN BLP 8407 10 CFR 50.55(e)
FIRST INTERIM REPORT Description of Deficiency
- During a design review initiated to investigate the generic concerns of Watts Bar nonconformance report (NCR) WBN WBP 8335 (WBRD-50-390/83-70, 50-391/83-65),
TVA determined that a similar condition exists at Bellefonte (BLN). Floor, equipment and sanitary facility vent and drain lines which penetrate the floor and roof slabs of the main control room (MCR) and technical support center (TSC) are not adequately designed to prevent air leakage into the MCR habitability system pressurization boundary. There is no assurance that traps will maintain enough water to seal off leak paths into the habitability zone nor, in most cases, are pipes sufficiently supported to maintain their pressure boundary in the case of a seismic event.
Interim Progress TVA is investigating the piping at each penetration, and modifications will be made as necessary so that the piping is seismically supported. Additional information will be provided after this investigation is complete.
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