ML20083F711
| ML20083F711 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 12/19/1983 |
| 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 8401030303 | |
| Download: ML20083F711 (2) | |
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I TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 374ot 400 Chestnut Street Tower II December 19, 1983 BLRD-50-438/83-31 BLRD-50-439/83-27 U.S. Nuclear Regulatory Commission l
Region II l
Attn:
Mr. James P. O'Reilly, Regional Administrator l
101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - TORNADO DEPRESSURIZATION -
BLRD-50-438/83-31, BLRD-50-439/83 SECOND INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector Linda Watson on April 14, 1983 in accordance with 10 CFR 50.55(e) as NCR BLN NEB 8304. This was followed by our interim report dated May 16, 1983 Enclosed is our second interim report. We expect to submit our next report by December 21, 1984. A similar deficiency has been reported separately for Watts Bar as NCR WBN NEB 8213 (WBRD-50-390/82-72, WBRD-50-391/82-67).
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, Menager 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 8401030303 831219 PDR ADOCK 05000439 S
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1983-TVA 50m ANNIVERSARY
/D7 An Equal Opportunity Employer
ENCLOSURE
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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 SECOND INTERIM REPORT Descriotion of Deficiency TVA's Nuclear Engineering Branch's (NEB) calculation TI-ECS-47, " Common Zone and Fuel Handling Area Tornado Depressurization Analysis,j assumes closed doors blow open at a pressure differential of 0.5 lb/in.
Subseouent analyses by TVA's Civil Engineering Branch indicate that doors may be significantly stronger when the pressure differential acts ggainst the door frame.
(A differential pressure of approximately 2 lb/in may be required to cause door failure in this case.) Loading on walls within the building may be higher than was originally calculated; however, the exact effect is unknown at this time.
Interim Progress Reevaluation of compartment pressures due to tornado depressurization of the common zone fuel handling area was made. The resulting maximum differential pressures between adjacent rooms does not exceed the capacity of the structural conponents of the Auxiliary Building. The removable concrete block walls will be restrained as necessary to resist the differential pressures across the respective walls.
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