ML20081C883

Revised Final Deficiency Rept NCR 2053 Re Cable Bend Radii for Diesel Generator Control Cabinets.Initially Reported on 821206.Subj Not Considered Nonconforming Condition.Records Amended Deleting Nonconformance as 10CFR50.55(e) Item

ML20081C883
Person / Time
Site:	Bellefonte
Issue date:	03/05/1984
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NCR-2053, NUDOCS 8403150059
Download: ML20081C883 (2)

Text

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w TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 l

400 Chestnut Street Tower II I'

I ditdch 5,1984 BLRD-50-438/83-01 l

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 UNIT 1 - CABLE BEND RADIUS FOR DIESEL GENERATOR CONTROL CABINETS - BLRD-50-438/83 REVISED 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 This was followed by our interim report dated January 3,1983 and our final report dated September 8,1983 Enclosed is our revised final report.

TVA does not row consider the subject renconforming 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, TENNESSEE VALLEY AUTHORITY L. M. Mills, nager Nuclear Licensing Enclosure cc:

Mr. Richard C. DeYoung, Director (Enclosure)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.

20555 l

Records Center (Enclosure)

Institute of Nuclear Power Operations 1100 Circle 75 Parkway,-Suite 1500 Atlanta, Georgia 30339 OMICIAIfCDPV

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840315O059 840305

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PM L

1983-TVA SOTH ANNIVERSARY An Equal Opportunity Employer

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I ENCLOSURE BELLEFONTE NUCLEAR PLANT UNIT 1 i

CABLE BEND RADIUS FOR DIESEL GENERATOR CONTROL CABINETS i

NCR 2053 BLRD-50-438/83-01 10 CPR 50.55(e)

REVISED FINAL REPORT 1

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-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 i

1RT-ELCP-1-A and 2-B are less than TVA General Construction Specification j

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.

TVA erroneously mported in the last report that the worst case bend radius inside these cabinets was approximately 16.3 inches.

The worst case was actually 10.5 inches which translates to a value of 6.6 4

times the cable's outside diameter.

Okonite's June 7,1983 letter to TVA stated that the concern in the mLnimum i

installed radius is that the shield system does not buckle or separate at-the tape overlap and that their shield tape overlap is 12-1/2 percent

ninimum. Based on the same letter, the bend radius of-6.6 times 0.D.

4

-inside the cabinets will not cause. separation. Therefore, based on the manufactumr'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 '

1 used "as is." No corrective action -is required.

Therefore, them are no safety implications to Bellefonte, and TYA no longer consider this ites to be reportable.under the requirements of 10 CFR SC.55(e).

To identify, evaluate and resolve Class 1E cable bend radius problems at i

Watts Bar and Bellefonte Nuclear Plants, TVA has appointed a task-team of representatives' from the Divisions 'of Engineering Design (EN DES) and l

Construction (CONST).. Several problems have been identified at both plants,- andl NCRs have been w:'itten where the. installed Class -1E cables do not meet the requirements of TVA Construction' Specification G-38..These -

NCRs are being dispositioned on a case-by-case basis..-In some cases, i

relaxed cable bend radiua values have been obtained fros' the cable "

manufacturers to allow accaptance of the as-installed configurations. For all future installations, TVA will comply with the established cable bend 4

radius values; or, receive specific mlaxation of these. values from vendors -

before cable installation.

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