ML20087L433

Final Significant Const Deficiency Rept 75 Re Station Battery Equalizing Charge Voltage Exceeding Coil Ratings. Initially Reported on 840120.Class IE Dc Equipment Evaluated During Equalizing Charge Voltage of 139.8 Volt Dc

ML20087L433
Person / Time
Site:	Waterford
Issue date:	03/14/1984
From:	Gerrets T LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
75, W3K84-0585, W3K84-585, NUDOCS 8403270202
Download: ML20087L433 (3)

Text

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Louisiama m oeta ONOe s1msu P O W E R & L i G H T! P O BOX 6008 . NEW ORLEANS. 70174<OUISIAHA

• (504) 364 2345 urotits SYSTEM March 14, 1984

}'S@MOWRK 4

I W3K84-0585 MAR 2 01984 H Q-3-A35.07.75 i;) ! .

JU Mr. John T. Collins Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 611 Ryan Plaza DrivL, Suite 1000 Arlington, Texas 76012

REFERENCE:

LP&L letter W3K83-1612 dated January 20, 1984

SUBJECT:

Waterford SES Unit No. 3 Docket No. 50-382 Significant Construction Deficiency No. 75

" Station Battery Equalizing Charge Voltage Exceeds Coil Ratings" Final Report In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copies of the Final Report of Significant Construction Deficiency No. 75,

" Station Battery Equalizing Charge Voltage Exceeds Coil Ratings".

If you have any questions, please advise.

Very truly yours, dT. F. Gerrets M Corporate Quality Assurance Manager TFG:CNH:VBR Attachment cc: Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 (15 copies) 8403270202 840314 PDR ADOCK 05000382 3 PDR

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Mr . John T,' Collins  !

March 14, 1984 W3K84-0585 Page 2.

cc: Director Office of Management Information and Program Control U.- S. Nuclear Regulatory Commission

. Washington,'D.C. 20s55 Mr..E. L. Blake-Shaw, Pittman, Potts, & Trowbridge 1800 M Street, N.W.

Washington, D.C. 20036 Mr. W. M. Stevenson Monroe & Lemann

-1424 Whitney Building New Orleans,' Louisiana 70130

Records Center Institute of. Nuclear Power Operations

1100 Circle 15 Parkway, Suite 1500 Atlanta, Georgia 70339

T'

.a FINAL REPORT OF SIGNIFICANT. CONSTRUCTION DEFICIENCY _No. 75

" STATION BATTERY EQUALIZING CHARGE VOLTAGE EXCEEDS COIL' RATINGS"

- INTRODUCTION-This ; report- is submitted - pursuant ' to 10CFR50.55(e) . It describes a design deficiency that existed in certain coils installed in the safety related 125v DC power system that were rated at ' lower voltages than those used for periodic equalizing charges in the station battery.

. DESCRIPTION'

, A survey of purchasing documentation indicates that some solenoid coils purchased for use as valve actuators are rated at 120v DC 10%. The normal system float voltage of 132v DC is at the upper limit of these cuil's ratings aud the periodic equalizing charge voltage of 139.8v DC exceeds the rating significantly.

SAFETY IMPLICATIONS-The operation of1these coils at voltages above their ratings may result in accelerated deterioration and failure of the coils thus rendering a system

-important to. safety inoperable, if left uncorrected.

CORRECTIVE ACTION-

~v

All class IE DC. equipment procured and installed at Waterford 3 was evaluated for elevated DC voltage during equalizing charge. voltage of 139.8v DC. The-evaluation concluded that clas,s- 1E DC equipment will not be subject to

' operating stresses in excess of what the equipment had been designed and tected to.

However,:to1 assure the life-and integrity of the equipment, a request for a

' change has been forwarded to licensing for incorporation in the next amendment to the FSAR.- Applicable maintenance procedures have been changed to reflect

the following voltage levels

- 1.1 Individual cell equalization while the rest of the battery is float charged between 130.2 and 135 volts.

2. Equalize charge is to be between 135 and 136.2 volts.

'No' hardware changes were required.

This report is submitted as the. final report.