ML20080N137
| ML20080N137 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 02/14/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8402220128 | |
| Download: ML20080N137 (2) | |
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O TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSCE 37401 400 Chestnut Street Tower II 51 34 KBis as:
February 14, 1984 BLRD-50-438/82-33 BLRD-50-439/82-30 U.S. Nuclear Regulatory Commission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - LACK OF ENVIRONMENTAL QUALIFICATION OF EQUIPMENT IN AUXILIARY BUILDING BECAUSE OF POTFliTIAL FAILURE OF STARTUP AND RECIRCULATION SYSTEM - BLRD-50-438/82-33, BLRD-50-439/82 FOURTH INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector R. V. Crlenjak on April 22, 1982 in accordance with 10 CFR 50.55(e) as NCR BLN NEB 8203 This was followed by our interim reports dated May 24, 1982 and January 27 and May 18, 1983 Enclosed is cur fourth interim report. We expect to submit odr next report by June 3,1985.
If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, nagor Nuclear Licensing i
Enclosure i
oct 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 0FFICIAL COPY 8402220128 840214 PDR ADOCK 05000438 TLZ7 PDR An Equal Opportunity Employer
ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 LACK OF ENVIRONMENTAL QUALIFICATI0M OF EQUIPMENT IN AUXILIARY BUILDING BECAUSE OF POTENTIAL FAILUhE OF STARTUP AND RECIRCULATION SYSTEM BLRD-50-438/82-33, BLRD-50-439/82-30 10 CFR 50.55(e)
NCR BLN NEB 8203 FOURTH INTERIM REPORT Description of Deficiency A pipe failuns of the runsafety grade Steam Generator Startup and Recirculation System in the Auxiliary Building could result in a harsh environment that exceeds the qualification limits for safety-related electrical equipment. Failure of nearby aarety-related equipment in one system train because of the harsh environment caused by the pipe break coupled with an assumed failure in the same safety system in the other train may result in a situation that could adversely affect safe shutdown of the plant.
The cause of this deficiency was determined to be lack of sufficient pipe break aralysis criteria at the tims of system design. No other TVA facilities are affected by this deficiency.
Interim Progress Design criteria N4-50-D749, " General Design Criteria for Environmental Design," has been revised to address temperature and humidity consequences of pipe break. Proper use of this criteria should prevent a recurrence of this problem.
Revisions to civil design drawings (concrate and steel) of the pipe chases and pump enclosures required to implement necessary piping isolation are still b1 progress.
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