ML20155J781

Final Deficiency Rept CP-88-11 Re Battery Overcharger Heating.Initially Reported on 880111.Condition Not Reportable Under 10CFR50.55(e) or 10CFR21

ML20155J781
Person / Time
Site:	Comanche Peak
Issue date:	06/17/1988
From:	Walker R TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
CP-88-11, TXX-88490, NUDOCS 8806210037
Download: ML20155J781 (2)

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"" 9 Log # TXX-88490

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File # 10110 2 908.3 7UELECTRIC Ref. # 10CFR50.55(e)

. June 17, 1988 Milliam G. Coumil Execushe Vace Presidens V. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET N05. 50-445 AND 50-446 BATTERY CHARGER OVERHEATING SDAR: CP-88-11 (FINAL. REPORT)

Gentlemen:

On January 11, 1988, we informed you via our report logged TXX-88070 of a i deficiency involving battery charger overheating. Subsequently, we notified you via TXX-88369 dated April 26, 1988 of our reevaluation of the reportability of this issue. Based on our reevaluation, we have concluded the criteria for reportability has not been met. The basis for this reevaluation 1

1 is described below.

Temperature measurements taken during additional testing conducted on battery chargers BCIE01-1, BCIED1-2 and BC1E02-3 determined that charger temperatures under nameplate load conditions are within manufacturer's tolerances with the exception of a single hot spot in charger BCIED1-1 adjacent to the TB1 coil.

Since the design of these three chargers is identical, the cause of the overheating of the charger is not generic to other chargers. Failure of one charger could not have resulted in a simultaneous common mode failure of redundant chargers. Therefore, the loss of BCIED1-1 would not result in the l

loss of 125 V dc power to switchbo'ard IED1 and its associated Class IE l

equipment. Accordingly, additional ~ forced cooling is not required for these l chargers. We are working with the vendor to resolve the problem with the  !

BCIE01-1 TB1 coil. I i

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8906210037 880617 M North olive street LB 81 Dallas. Texas 7201 PDR ADOCK 05000445 S DCD .I

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TXX-88490 June 17, 1988 Page 2 of 2 Based on the above', we have concluded that_this condition does not represent a reportable deficiency in design or construction as described under 10CFR50.55(e), .or a substantial safety hazard as defined under 10CFR21, and is therefore not reportable pursuant to these regulations.

Very truly yours, W. G. Counsil By: crWA b' ' If-R. D.'M alker.

Manager, Nuclear Licensing WJH/grr c - Mr. R. D. Martin, Region IV Resident Inspectors, CPSES (3)

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