ML20070L499
| ML20070L499 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 12/22/1982 |
| 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 8301030146 | |
| Download: ML20070L499 (2) | |
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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 374ot
.400 Chestnut Street Tower II December 22, 1982 BLRD-50-438/82-21 BLRD-50-439/82-19
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3 U.S. Nuclear Regulatory Conslission a
Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 2
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101 Marietta Street, Suit ( 7100 Atlanta, Georgia 30303 5
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Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - SEISMIC ANALYSIS OF THE cn AUXILIAP-CONTROL BUILDING - BLRD-50-438/82-21, BLRD-50-439/82 FOURTH JTERIM REPORT
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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 and July 22, 1982. Our third interim report was submitted'on September 20, 1982; however, it was incorrectly dated December 23, 1982.
Enclosed is our fourth interim report. We expect to submit our next repo' t by June 17, 1983 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.
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01030146 821222 picFTCI AL C%d' R ADOCK 05000438 g
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An Equal Opportunity Employer
i,.4 ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 SEISMIC ANALYSIS OF THE AUXILIARY-CONTROL BUILDING NCR BLK CEB 8201 BLRD-50-438/82-21, BLRD-50-439/82-19 10 CFR 50 55(e)
FOURTH IlffERIM 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 i
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 mado 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 A revision to the original seismic analysis report has been completed and-transmitted by official TVA memorandum to all affected organizations, and design review meetings have been held to formally discuss the new analysis with these organizations. This reanalysis has identified the need for the addition of two walls from elevation 686.0 to 704.5 feet, and Engineering Change Notice 1561 hasJbeen initiated to ensure the construction of these walls.
Other structures at Bellefonte.will be evaluated against the seismic analysis models to determine if the problem extends to them. The evaluation will be documented in a detailed report. Also, existing drawing review procedures are being studied and revised to ensure that proposed structural modifications are evaluated for their effect on the original seismic analyses.
Studies are being made to determine if other TVA nuclear plants are affected.
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