U-602876, Interim Part 21 Rept Re 970929 Discovery of Deviations in safety-related Battery Chargers.Evaluation of Conditions Under Part 21 Continuing.Update on Resolution Progress Will Be Provided by 980129
| ML20202G589 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 12/03/1997 |
| From: | Jackie Cook ILLINOIS POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| REF-PT21-97 U-602876, NUDOCS 9712100072 | |
| Download: ML20202G589 (2) | |
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1%o s Poer Company Chnton Power Station P O Box 678 1
Cimton. IL 61727 Tel 217 93b 5673 Feu 217 935 4632 3
John o. Cook NE,
Lems V(e Presder
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U-602876 4F.140 trecember 3, 1997 Docket No. 50-461 10CFR21.21 Document Control Desk Nuclear Regulatory Commission Washington, D. C. 20555
Subject:
10CFR21 Interim Report 2197-044/047/048:
Qgyiations in Safety Related Battery Charnu
Dear Madam or Sir:
On September 29,1997, the Division 2 safety related battery charger failed to operate as expected. Operators received an alarm in the Mala Control Room indicating
' low Division 2 DC bus voltage. Indications also included 0 amf output from the Division 2 battery charger, and DC bus voltage stabilized at about 128 VDC which is the expected voltage for a loss of the battery charger. An electrician was dispatched to the Division 2 battery charger to investigate the problem and noted that the charger appeared to be stopping and starting itself" electronically"; the DC voltage and output current decreased to 0 and then returned to normal. The self starting and stopping of the charger occurred 4 times over approximately a 30 minute period before the charger was secured for troubleshooting.
On October 4,1997, as a result of troubleshooting Illinois Power (IP) identified inadequate soldered wire connections throughout the battery charger. Specific examples.
include solder connections on the Silicon Controlled Rectifier (SCR) firing circuit boards
,q' and on wiring connections for the SCR firing circuit. This issue was determined to be
,ji
. potentially reportable under 10CFR21; Condition Reports (CR) 1-97-10-090, Ib l-97-10123, and 1-97-10-201 were initiated to track investigations and resolutions of
/
these issues.
9 On October 15,1997, during further troubleshooting, IP noted 2 rnomalies with l
the liigh Vohage Alarm (Shutdown) (DSHV) circuit card. The time delay for the circuit card was approximately 6 seconds rather than 30 seconds per the purchase specification, and the reset voltage setpoint of the DSIIV was too low to allow the DSHV circuit card to reset during a momentary voltage transient while the battery charger was in the equalize mode. This issue was determined to be potentially reportable under 10CFR21; CR l.10 241 was initiated to track an investigation and resolution of this issue.
l 9712100072 971203
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DR ADOCK 05000461:
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U402876 Page2 in addition, during bench testing on October 15,1997, a new DSIIV circuit card front storer failed to provide an output. The circuit card was being tested prior to installation to determine its output response time. During the testing, the trip setpoint voltage was reached and the LED indication illuminated; however, the card failed to provide the required output for the alarm and trip functions. This issue was determined to be potentially :eportable under 10CFR21; CR 197-10 249 was initiated to track an investigation and resolution of this issue.
These conditions may also be applicable to the Divisions I and 4 safety related battery chargers. The Divisions 1,2, and 4 safety related battery chargers are hiodel 3FC-130 300, supplied by Power Conversion Products, Inc. The DSHV reset voltage setpoint was provided by Sargent & Lundy.
IP's evaluation of these conditions under 10CFR21 has not yet been completed.
IP does not have a firm date for resching this issue but will provide, as ?. minimum, an update on the resolution progress by January 29,1998.
Additional information about this issue may be obtained by contacting bl. D.
Wagner, Plant Engineering, at (217) 935 8881, extension 4071.
Sincerely ours.
4 J. G. Cook i
Senior Vice President RSF/krk cc:
NRC Clinton Licensing Project hianager NRC Resident Oflice, V-690 Regional Administrator, Region 111, USNRC lilinois Department of Nuclear Safety INPO Records Center l
Power Conversion Products, Inc.
l Sargent & Lundy 1
l 1
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