ML20071K675
| ML20071K675 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 07/22/1982 |
| 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 8208020169 | |
| Download: ML20071K675 (2) | |
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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA, TENNESSEE 374o1 400 Chestnut Street Tower II m
July 22, 1982 BLRD-50-438/82-21 y.J RD m
BLRD-50-439/82-19
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U.S. Nuclear Regulatory Commission Region II w
Attn:
Mr. James P. O'Reilly, Regional Administrator C
101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - SEISMIC ANALYSIS OF THE AUXILIARY-CONTROL BUILDING - BLRD-50-438/82-21, BLRD-50-439/82 SECOND INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector Ross Butcher on February 26, 1982 in accordance with 10 CFR 50.55(e) as NCR BLN CEB 8201. Our first interim report was submitted on March 26, 1982. Enclosed is our second interim report. We expect to submit our next report by September 20, 1982.
If you have any questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, nager Nuclear Licensing Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 i
(Dynew. copy 8208020169 020722 PDR ADOCK 05000438 S
PDR An Equal Opportunity Employer
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 SEISMIC ANALYSIS OF THE AUXILIARY-CONTROL BUILDING NCR BLN CEB 8201 BLRD-50-438/82-21, BLRD-50-439/82-19 10 CFR 50.55(e)
SECOND INTERIM REPORT Description of Deficiency The original seismic analysis of the Bellefonte Nuclear Plant Auxiliary-Control Building was performed in 1973 and was based on issued concrete
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general outline feature drawings that were not intended for use by the Division of Construction (CONST). Subsequently, outline drawings for use by CONST were issued and, in portions of the building, significant changes in the structural configuration were made.
However, the seismic analysis personnel were unaware of the changes made by the later drawings. While assessing the potential changes in the original seismic analysis, that_the location of the postaccident sampling facility in this structure would make, the discrepancy between the original and later outline drawings was noted. Preliminary investigations indicate potential significant changes in the structural responses. Consequently, the results of the present seismic analysis do not adequately reflect those of the current geometry.
A revised seismic analysis is required.
The cause of the deficiency was a failure to coordinate design changes with appropriate organizations in accordance with the Division of Engineering Design Procedure EP 4.01.
Interim Progress TVA seismic personnel have performed a revised seismic analysis based upon the present day structural configuration. The, results of this analysis will be issued as a revision to the present seismic report for use by TVA design personnel in assessing the effects of these changes on the structure and equipment, The report documenting the analysis will be completed by August'1, 1982. Existing procedures are being revised to ensure that proposed structural modifications are e"aluated for their effect on the seismic analyses. Other structures at Bellefonte Nuclear Plant will be evaluated against the seismic analysis models to determine if the problem extends to them.
Studies are being made to determine if other TVA nuclear plants are affected.
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