ML20076K654
| ML20076K654 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 09/08/1983 |
| 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, 83-01, 83-1, NCR-2053, NUDOCS 8309150160 | |
| Download: ML20076K654 (2) | |
Text
U.
e TENNESSEE VALLEY AUTHORITY CHATTANOOG A. TENNESSEE 37401 400 Chestnut Street Towar II september 8,1983 BLRD-50-438/83-01 U.S. Nuclear Regulatory Comission 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 UNIT 1 - CABLE BEND RADIUS FOR DIESEL GENERATOR CONTROL CABINETS - BLRD-50-438/83 FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector P. E. Fredrickson on December 6, 1982 in accordance with 10 CFR 50.55(e) as NCR 2053 Enclosed is our final report. Please note that a delay of this submittal was discussed with P. E. Fredrickson.
TVA does not now consider the subject nonconforming condition adverse to the safe operation of the plant. Therefore, we will amend our records to delete the subject nonconformance as a 10 CFR 50.55(e) item.
If you have any questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, l
TENNESSEE VALLEY AUTHORITY pS h L. M. Mills, Manager l
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 8309150160 830900
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PDR ADOCK 05000438
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PDR 1983-TVA SOTH ANNIVERSARY
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An Equal Opportunity Employer L
d ENCLOSURE BELLEFONTE NUCLEAR PLANT UNIT 1 CABLE BEND RADIUS FOR DIESEL GENERATOR CONTROL CABINETS NCR 2053 BLRD-50-438/83-01 10 CFR 50.55(e)-
FINAL REPORT Description of Deficiency The "from end" cable bend radii of medium voltage power cables 1RT-ECAS-69, 70, 71-A and 194,195,.196-B in diesel generator control cabinets 1RT-ELCP-1-A and 2-B are less than TVA General Construction Specification n
G-38 minimum allowable values. The design and installation of the cable system for the diesel generator control cabinets was performed by TVA.
Safety Implications The above cables were supplied by the Okonite Company on contract 79K5-825903, item 3 The worst-case bend radius inside the cabinets measured approximately 16.3 inches, or approximately 10.2 times the cable maximum 0.D. of 1.60 inches.
Okonite's June 7,1983 letter to TVA states that the concern in the minimum.
installed radius is that the shield system does not buckle or separate at the tape overlap. Okonite states that their shield tape overlap is 12-1/2 percent minimum, and their calculations show that the bend radius of 10.2 times O.D. inside the cabinets will not cause separation. Therefore, based on the manufacturer's analysis, we have determined that the cable bend in generator control cabinets 1RT-ELCP-1-A and 2-B are acceptable and will be use "as is." No corrective action is required.
Therefore, there are no safety implications to Bellefonte, and TVA no longer consider this item to be reportable under the requirements of 10 CFR 50.55(e).
[
To identify, evaluate and resolve Class 1E cable bend radius problems at Watts Bar and Bellefonte Nuclear Plants, TVA has appointed a task team of representatives from the Divisions of Engineering Design (EN DES) and Construction (CONST). Several problems have been identified at both plants, and NCRs have been written where the installed Class 1E cables do not meet the requirements of TVA Construction Specification G-38.
These l
NCRs are being dispositioned on a case-by-3ase basis. In some cases, l
relaxed cable bend radius values have been obtained from the cable manufacturers to allow acceptance of the as-installed configurations. For all future installations, TVA will comply with the established cable bend radius values; or, receive specific relaxation of these values from vendors before cable installation.
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