ML20071L907
| ML20071L907 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 09/21/1982 |
| 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 8209240169 | |
| Download: ML20071L907 (1) | |
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a TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 374ot 400 Chestnut Street Tower II
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BLRD-50-438/82-21 BLRD-50-439/82-19 c3 dili U.S. Nuclear Regulatory Conunission
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Region II
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Attn:
Mr. James P. O'Reilly, Regional Administrator
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101 Marietta Street, Suite 3100
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Atlanta, Georgia 30303 2,
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Dear Mr. O'Reilly:
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BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - SEISMIC ANALYSIS OF THE D
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AUXILIARY-CONTROL BUILDING - BLRD-50-438/82-21, BLRD-50-439/82 THIRD 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 and July 22, 1982. Enclosed is our third interim report. We expect to submit our next report by December 23, 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 f
U.S. Nuclear Regulatory Commission Washington, D.C.
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8209240169 820921 PDR ADOCK 05000438
' OFFICIAL COljd An Equal Opportunity Employer
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r 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)
THIRD INTERIM REPORT 1
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 s
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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 A report documenting the revised seismic analysis has been completed and is in the process of being issued to affected organizations within TVA, because this report indicates the need to make some minor structural j
additions. Existing procedures are being revised to ensure that proposed i
structural modifications are evaluated 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.
j Studies are being made to determine if other TVA nuclear plants are l
affec ted.
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