ML20070L545

Final Significant Const Deficiency Rept 58 Re 820712 Cable Tray Fire in Reactor Auxiliary Bldg at Elevation 35 Ft. Initially Reported on 820806.Thirteen of 30 Damaged Cables Replaced.Insulation Sustained.Repairs Acceptable

ML20070L545
Person / Time
Site:	Waterford
Issue date:	12/21/1982
From:	Maurin L LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, Q-3-A35.07.58, W3I82-0139, W3I82-139, NUDOCS 8301030173
Download: ML20070L545 (3)

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6 Louisiama ,4e o<<anoNoe s1eeer P O W E R & L 1 G H T! P O BOX 6008 . NEW CRLEANS. LOUISIANA 70174

. [504) 366-2345 MIDDLE SOUTH UTILITif S SYSTEM L. V. MAURIN December 21, 1982 (

W3I82-0139 h'k 3 Q-3-A35.07.58 j(d s

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xy'y Mr. John T. Collins, Regional Administrator, Region IV \

U. S. Nuclear Regulatory Commission ~

611 Ryan Plaza Drive, Suite 1000 -x Arlington, Texas 76012 s N

SUBJECT:

Waterford SES Unit No. 3 '

Docket No. 50-382 Significant Construction Deficiency No. 58

" Cable Tray Fire in RAB at Elevation 35'"

Final Report

REFERENCE:

LP&L letter W3K82-0496 dated August 6, 1982

Dear Mr. Collins:

In accordance with the requirements of 100FR50.55(e), we are hereby providing two copies of the Final 12 port of Significant Construction Deficiency No. 58, " Cable Tray Fire in RAB at Elevation 35'."

If you have any questions, pleau advise.

Very truly yours, l

L. V. Maurin l LVM/ MAL:keh 1

cc: 1) Director 3) E. Blake ] E ~ 2--7 l Office of Inspection & Enforcement

! U. S. Nuclear Regulatory Commission Washington, D. C. 20555 (with 15 copies of reprt)

( 2) Director 4) W. Stevenson l Office of Management Information and Program Control U. S. Nuclear Regulatory Commission Washington, D. C. 20555 l (with I copy of report) l l

r301030173 PDR ADOCK Mh 2 PDR S

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FINAL REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 58

" CABLE TRAY FIRE IN RAB AT ELEVATION 35'"

INTRODUCTION -

This report is submitted pursuant to 10CFR50.55(e). It describes a fire affecting Class 1E Control Cables in the Reactor Auxiliary Building (RAB).

This problem is considered reportable under the requirements of 10CFR50.55(e).

To the best of our knowledge it h'as not been reported' pursuant to 10CFR21.

DESCRIPTION On July 12, 1982, at approximately 10:50 A.M., a fire was discovered in cable tray C201M-SA between plan points 1936 and 1935. The fire resulted from an ignited piece of cardboard resting on the cables. The cable tray area affected by the fire was not more than two feet in length and less than the full width of the tray. The cable tray contained 105 cables, of which 30 were visibly damaged to varying degrees. Cables in the upper layer received the most damage. Their jackets were charred and fell off in portions, exposing the insulated conductors. However, in no case'was damage to the insulation suffi-cient to expose the copper conductor.

SAFETY IMPLICATIONS The damaged cables are part of Class IE cable system and if left uncorrected, the safety related equipment served by these cables could be adversely affect-ed. The deficiency is, therefore, reportable.

CORRECTIVE ACTION Non-Conformance Report W3-4098 was initiated to document and track corrective

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action. Of the 30 damaged cables, 13 cables were considered unacceptable for Class 1E use; these were identified and replaced. The remaining 17 cables exhibited partial jacket chars, but there was no notice able embrittlement c' either the insulation or the jacket material in the affected areas. In oroar to determine whether the cable insulation was degraded or aged as a result of exposure to the fire, samples from cables that were damaged and others that might have been affected were tested by the cable manufacturer. Testing confirmed that the insulation of the cable samples sustained no damage.

Consequently, jacket repairs to the remaining cables were made as needed, reference FCR E-2064. A 20% sample of the undamaged cables was meggered and continuity tested. All replaced cable, repaired cable, and original undamaged cable was found to be acceptable. ,

Referet.ce Ebasco letter No. F-59065E dated July 21, 1982. All contractors we e instructed by the referenced letter from R. T. Watt, Ebasco Contract Manag_r, warning of the cause of the cable tray fire and instructed contractors to hold

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-* Paga 2 weekly meetings, instructing work forces.how to protect and maintain cleanli-ness on plant equipment to preclude recurrence. Unscheduled inspection of randomly selected plant areas indicated instruction to be effective. All corrective action on NCR W3-4098 was completed, reviewed, accepted and closed on December 6, 1982.

This report is submitted as the Final Report, r

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