ML20090K671
| ML20090K671 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 05/08/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8405240314 | |
| Download: ML20090K671 (2) | |
Text
--
~
a
- ~
. TENNESSEE VALLEY AUTHORITY CHATTANOOGA, TENNESSEE 374ot 400 Chestnut Street Tower II May 8, 1984 0 4g,8(
BLRD-50-438/83-31 BLRD-50-439/83-29 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 - ERROR IN SEISMIC DATA USED IN AUXILIARY-CONTROL BUILDING DESIGN - BLRD-50-438/83-31, BLRD-50-439/83 FIRST INTERIM REPORT.
The subject deficiency was initially reported to NRC-0IE Inspector R. Carroll on April 6,1984 in accordance with 10 CFR 50.55(e) as NCR
- BLN CEB 8404. Enclosed 'is our first interim report. We expect to submit our next report by August 4,,1986.
If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY
. M. Mills, Manager Nuclear Licensing Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Coinnission Washington, D.C.
20555~
Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia ~ 30339 k
8405240314 840500 DR ADOCK 05000 nyytcIALCOPY 1983-TVA 5OTH ANNIVERSARY An Equal Opportunity Employer M
ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 ERROR IN SEISMIC DATA USED IN AUXILIARY-CONTROL BUILDINf DESIGN
~BLRD-50-438/83-31, BLRD-50-439/03-29 NCR BLN CEB 8404 10 CFR 50.55(e)
FIRST INTERIM REPORT Description of Deficiency TVA committed in BLN FSAR section 3 7.1.2, " Design Time History," to base the seismic design response spectra on three statistically independent artificial earthquake records, two horizontal records and one vertical rec ord. We found during a review of ma'.1 steam valve room B that the Auxiliary-Control Building seismic analysis used only one of the horizontal time histories in both horizontal directions. When the Auxiliary-Control Building spectra was reanalyzed 'using both horizontal time histories, the east-west peak acceleration, velocity, and displacement values significantly increased.
Interim Progress TVA has reanalyzed the Auxiliary-Control Building and generated new response spectra. We are checking the reanalysis and will issue a revised report including the revised spectra to all affected Division of Engineering Design (EN DES) organizations. These organizations will then assess the effects of the revised spectra on safety-related structures, systems, and equipment.
J
__