Part 21 Report - 1995-170
ACCESSION #: 9507170398 Illinois Power Company Clinton Power Station P.O. Box 678 Clinton, IL 61727 Tel 217 935-5623 Fax 217 935-4632 John G. Cook Vice President ILLINOIS POWER U-602466 L16-95( 07-12 )LP 4F.140 July 12, 1995 JGC-284-95 Docket No. 50-461 10CFR21.21 Document Control Desk Nuclear Regulatory Commission Washington, D.C. 20555 Subject: Follow-Up to 10CFR21 interim Report 21-95-010: Elgar Inverter PWM Drive Logic Card (J4) Failure Dear Sir: On May 22, 1995, Illinois Power (IP) issued 10CFR21 Interim Report 21-95-010: Elgar Inverter PWM Drive Logic Card (J4) Failure, (IP letter U-602446), to notify the NRC that an evaluation was being performed of the logic card failures in accordance with the provisions of 10CFR21. The interim report stated that the evaluation of the issue was expected to be completed by June 30, 1995. The evaluation completion date was based on the expectation that returning the deficient cards to Elgar Corporation for failure analysis would lead to identification of the cause of the logic card failures. Elgar has performed several functional tests on the cards and has found no logic card deficiencies. However, since the logic cards did fail in the Clinton Power Station (CPS) inverter, Elgar has employed an independent consultant to assist in the failure analysis. Elgar has performed additional testing of the cards on site (at CPS) and is developing a schedule for evaluating the test results; however, no completion date has been provided to IP. IP will provide an update on the status of the evaluation of this issue by September 27, 1995. Sincerely yours, J. G. Cook Vice President RSF/csm cc: NRC Clinton Licensing Project Manager NRC Resident Office, V-690 Regional Administrator, Region III, USNRC INPO Records Center Illinois Department of Nuclear Safety Elgar Corporation *** END OF DOCUMENT ***
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Page Last Reviewed/Updated Wednesday, March 24, 2021