ML20111B413
| ML20111B413 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 01/07/1985 |
| From: | Hufham J TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8503130100 | |
| Download: ML20111B413 (2) | |
Text
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~ TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 400 Chestnut Street Tower II NN l0 P l *. I anuary 7,1985 BLRD-50-438/85-02 BLRD-50-439/85-02
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U.S. Nuolear Regulatery Commission
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Region II Attn:
Mr. James P. 0'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 l
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Dear Mr. O'Reilly:
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BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - SUPPORTS MAY BE DEGRADED BY USE OF INSTALLATION TOLERANCES - BLRD-50-438/85-02, BLRD-50-439/85 FIRST l
INTERIM REPORT l
The subject deficiency was initially reported to NRC-0IE Inspector S. Weise on December 6,1984 in accordance with 10 CFR 50.55(e) as NCR BLN CEB 8421. Enclosed is our first interim report. We expect to-submit our next rwport on or about July 12,1%5.
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If you have any questions, please get in touch with R. H. Shell at l
FTS 858-2688.
Very truly yours, l
TENNESSEE VALLEY ALTrHORITY
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. W. Hufham, Manager
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Licensing and Regulations l
Enclosure oc: 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 h
38 N
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. OFFICIAL COPY T g17 An Equal Opportunity Employer
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'e ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 i
SUPPORTS MAY BE DEGRADED BY USE OF INSTALLATION TOLERANCES BLRD-50-438/85-02, BLRD-50-439/85-02 BLN CEB 8421 10 CFR 50.55(e)
FIRST INTERIM REPORT Description of Deficiency TVA's drawing 36A0059-00-12, Revision 4, Note III.1, provides TVA's Office of Construction (OC) with several tolerances for fabrication and modification of baseplates and installation of anchor bolts (excluding TVA typical supports which are not modified by field variance). These tolerances were primarily given to allow OC to resolve problems with interference of expansion anchor bolts with reinforcing steel. The cumulative effects of the use of these tolerances may result in significant increases in baseplate stresses and anchor bolt loads. The potential increases due to cumulative effects were not considered in the design of the various supports.
Interim Progress For future pipe support designs, a study has been initiated to assess the possible detrimental effects of the cumulative application and baseplate tolerances as described above. Based on the results of this study, current design practices will be revised, if necessary, to account for the use of the tolerances. For supports already designed, fabricated, and installed, a sample will be chosen and the baseplate and anchors evaluated in the as-constructed configuration to determine acceptability under the appropriate criteria.
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