ML20072C382
| ML20072C382 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 06/15/1983 |
| 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 8306210042 | |
| Download: ML20072C382 (2) | |
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TENNESSEE VALLEY AUTHORITY M fj g
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8.* g June 15, 1983 BLRD-50-438/82-21 BLRD-50-439/82-19 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 - SEISMIC ANALYSIS OF THE AUXILIARY-CONTROL BUILDING - BLRD-50-438/82-21, BLRD-50-439/82 FIFTH 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. This was followed by our interim reports dated March 26, July 22, September 20, and December 22, 1982. Enclosed is our fifth interim report. We expect to submit our next report by June 22, 1984.
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, Manager 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 0Fy1CI AL U'
$$NNO 000 $
An Equal Opportunity Employer
a 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)
FIFTH 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 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 The original seismic analysis report has been revised, design review meetings have been held with affected organizations to discuss the new analysis, and engineering change notice (ECN) 1561 has been Laitiated to ensure the construction of two walls required by the new analysis. Also, existing drawing review procedures are being revised to make sure that proposed structural modifications are evaluated for their affect on original seismic analyses.
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Regarding generic concerns TVA is evaluating other structures at Bellefonte.
l against the seismic analysis models and has completed a study at Watts Bar as delineated in the Division of Engineering Design (EN DES) Special Engineering Procedure 82-14. This study was used to determine if the present seismic analysis reports for Watts Bar reflected as-built structural conditions, and as a consequence of this study, nonconformance (NCR) WBN CEB 8301, " Seismic Analysis of the North Steam Valve Rooms," was written. NCR WBN CEB 8301 is being handled separately.
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