U-602920, Part 21 Interim Rept 21-97-044/047/048 Re 970929 Failure of safety-related Battery Charger.Caused by Inadequate Soldered Wire Connections.Util Will Issue Rept of Issues IAW Provisions of 10CFR21 & 10CFR50.73 by 980217

Part 21 Interim Rept 21-97-044/047/048 Re 970929 Failure of safety-related Battery Charger.Caused by Inadequate Soldered Wire Connections.Util Will Issue Rept of Issues IAW Provisions of 10CFR21 & 10CFR50.73 by 980217

ML20199D918
Person / Time
Site:	Clinton
Issue date:	01/28/1998
From:	Walter MacFarland ILLINOIS POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-PT21-98 U-602920, NUDOCS 9802020051
Download: ML20199D918 (3)

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January n,1998 Docket No. 50-461 10CFR21.21 Document ControlDesk Nuclear Regulatory Commission -

Washington, D.C. 20555 S.loject: 10CFR21 Initial Report 21 97-044/047/048:

Dedations in Safety Related Dattery Charata Dear Madam or Sir; On December 3,1997, Illinois Power (IP) luued 10CFR21 Interim Report 21 97-044/047/048 in letter U 602876 to notify the NRC that an evaluation under the provisions of 10CFR, Part 21 was not complete for deviations discovered in safety.

related bettery chargers. The following information is a follow up to the December 3,

' 1997, letter.

On September 29,1907, the Division 2 safety-related battery charger fai!cd to operate as expected. Operators received an alann in the Main Control Room indicating low Division 2 Direct Current (DC) bus voltage. Indications also included zero ampa outpe ' rom the Division 2 battery charger, and DC bus voltage stabilized at about 123 Volts Direct Current (VDC) which is the expected voltage for a loss of the battery charger. An clectrician *.vas dispatched to the Division 2 battery charger to investigate the problem and noted that the charger appeared to be stopping and starting itself "clectronica'ly"; the DC vohage and output current decreased to zero and then retumed to normal. The self-starting and stopping of the charger occurred four times over approximately a 30 minute period before the charger was scoured for troubleshooting.

On October 4,1997, as a ruult of troubleahooting, IP identifad inadequate soldered wire connections throug'.out the battery charger. Specifio examples include solder connections on the Silicon Controlled Rcetifict (SCR) firing circuit boards and on wiring connecticns for the SCR firing circuit. This issue was determined to be potentially reportable under 10CFR21; Condition Reports (CR) 1 97-10 090, 197 10-123, and 1-97 10-201 were initiated to track the evaluation and ruolution of the inadequate soldered wire connection issues.

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,, . . On Octobw 15,1997, during further troubleshooting, P noted two anomalies with the High Voltage Alarm (Shutdown) (DSHV) circuit card. The time delay fbr the circuit card was approximately obt seconds rather than 30 seconds per the purchase @#, cation, and the reset vohage setpoint of the DSMV was too low to allow the D5HV c!rcuit card to reest during a momentary vohage transient while the hattery charger was in the equalize mode. These issues were detaminal to he potentially reportable under 1%1; CR 1 9710 241 was initiated to track an evaluation and resolution of the D51it circuk card lannes.

The deviations dineussed above .re also applicable to the Divisions 1 and 4 safbty-related hattery chargern, with the exception that no inadequate solder issues were identined in the Divialen 4 battery charger.

The Divisions 1,2, and 4 safety.related battery chargers are Model 35C 130 300

- supplied by Poww Conversion Products, Inc. The I)SHV remet vnitage setpoint was provided by sargent & Lundy.

On January 16,1998, an evaluation of these lasues concluded that the inadequate soldered wire connection issues did result in a fWlure of the Division 2 battery charger l while it was performing its saftty fbaction and caused the Division 2 safbty-related battery l charger to be inoperable. Therefbre, these issues should be reported undw the piovlslons of 10CFM50.73. ,

IP has completed the evaluation of the hattery charger deviations and concludes that these issues should also be reported under the provisions of 10CFR21. The basis fbr the reportable concinnion is that some of the solder issues, and the D5HV time delay and remet voltage netpoint circuit card issues, were supplier deviations that left uncorrected could have caused a loss of the safety function of the Division 2 battwy charger, IP willlasue a report of these lasues in acco dance wiGi the provisions of 10CFR21 and 10CFR50,73 by February 17,1998. ,

TP also reported in the December 3,1997, letter that, during bench testing on October 15,1997, a new DSHV circuit card from stores thlied to provide an output. The DSHV circuit card wra heing tested prior to Installation to determine its output response time.1)uring the tanting, the trip setpoint voltage was reached and the LED indication illuminated; however, the DSHV circuit card fhiled to provide the required output for tlw alarm and tdp functions. - This issue was determined to be potentially reponable undw 10CFR21, and CR l 97-10 249 was initiated to track an evaluation and resolutlun'orthe DSHV circuit card that fklied to provide an out9ut. The evaluatbu of tisis issue has concluded that the fhilure of the D5HV circuit card to provide an output is not reportable under 10CFR21. The buis fbr thl conclusion la that the DSHV circuit card requires calibration prior to installation. Calibration of the DSHY circuit card revealed the failurc

-- of the card to provide an output; thee rfun c, the failure could not go uncorrected.

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,,, , , Additionalinformation shout these issues may be chtained by contacting M. D. Wagner, Plant Engineering, et (217) 93$.8881, extension 4071.

Sincerely yours, O' ,

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e WJter G. MacFarland, IV ChiefNuclear OEcer RSF/ktk cc: NRC Clinton Licensing Project Manager NRC Resident OEce, %690 Regional Administrator, Region III, USNRC Illinois Department of Nuclear Safety INPO Records Center ,

Power Cowersion Products .

Sargent & Lundy

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