ML20023D461
| ML20023D461 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 05/16/1983 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8305200519 | |
| Download: ML20023D461 (2) | |
Text
ar-7' TENNESSEE VALLEY AUTHORITY CH ATTANOOGA, TENNESSEE 374o1 400 Chestnut Street Tower II May 16, 1983 BLRD-50-438/83-31 m
BLRD-50-439/83-27 w
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U.S.-Nuclear Regulatory Commission D
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-t O Region II Attn:
Mr. James P. O'Reilly, Regional Administrator I' x dy 101 Marietta Street, NW, Suite 2900 m
Atlanta, Georgia 30303 5
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Dear Mr. O'Reilly:
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3ELLEFCNTE NUCLEAR PLANT UNITS 1 AND 2 - TORNADO DEPRESSURI2ATION -
BLRD-50-433/83-31, BLRD-50-439/83 FIRST_I,NTERIM REPORT The subject, deficieocy var initially reported to NRC-OIE Inspector Linda Watson on April 14, 1983 in accordance with 10 CFR 50.55(e'/ as NCR 3LN NEE 8304. Enclosed is our first interim report. We expect to submit our r. ext report by D9cember 21, 1983 A similar deficiency has beer reported separately for Watts Bar as NCR WBN NEB 8213 If yr have any questions, please get in touch with R. H. Shell at FTS 853-2668.
Very truly yours, TENNESSEE VALLEY AUTHO3ITY L. M. Mills, Manager Nuclear Licensing Enclosure oc:
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
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PDR An Equal Opportunity Employer
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2
. TORNADO DEPRESSURIZATION.
- BLRD-50-438/83-31, BLRD-50-439/83-27 10 CFR 50.55(e)
NCR BLN NEB 8304 FIRST INTERIM REPORT i
l Description of Deficiency TVA's Nuclear Engineering Eranch's -(NEB) calculation TI-ECS-47, " Common Zons and Fuel Handling Area Tornado Depressurization Analysis,'" assumes closed doors blow open at a pressure differential of 0.5 lb/in.
Subsequent analyses by TVA's Civil Engineering Branch indicatg that decrs
.may be significantly stron$er wnen the pressure differential acts ggainst the door frame.
/A differential pressure of app?cximately 2 lb/in' 'rmay be required to cause door failure in this case.) Loading on walls within the building may be higher than was originally, calculated; however, the exsot effect is unknown at this tire.
I InL?rirq Progress Initia1 review of the concrete structure for differential pressure of 9
2 lb/in" indicated that all walls and floors will maintain structural i
integrity but may require a red.sction in live load or the venting of pressure by placement of penetrations in walls or floors. NEB is performing depressurization calculations. These results will be used in determining if reduced live loads or venting is required.
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