ML20003H634

Part 21 Rept Re Defect in Topaz Electronics Inverters.Ge Informed Utils Affected & Advised Utils to Return Inverters to GE for Replacement or Repair

ML20003H634
Person / Time
Site:	Limerick
Issue date:	09/05/1979
From:	Sherwood G GENERAL ELECTRIC CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20003H635	List: ML20003H634
References
REF-PT21-81-410-000 MFN-228-79, NUDOCS 8105060550
Download: ML20003H634 (2)

Text

O 2 7 GENERAL ELECTRIC suCtaAa sneaav PROJECTS DIVISION GENEML ELECTRIC COMPANY,175 CURTNER AVE., SAN JOSE. CALIFORNIA 95125 MC 682, (408) 925-5040 MFN-228-79 September 5, 1979 Mr. Robert H. Engelken Office of Inspection and Enforcemer.t U. S. Nuclear Regulatory Commission Region V 1990 North California Street Walnut Creek, CA 94596

SUBJECT:

REPORTABLE CONDITION OF TOPAZ INVERTERS - BWR 5/G This is to advise the NRC of a reportable condition per 10CFR Part 21.

It was reported to J. L. Crews of your office by Walter d. D'Ardenne, Manager, BWR Product Standards on September 5, 1979.

Tae defect is in inverters manufactured by Topaz Electronics, San Diega, California.

The defect was judged to be reportable on September 5, 1979.

Attached is a report of the defect.

l General Electric (GE) as the supplier of the subject inverter has informed the utilities affected and advised them to return the inverters to GE for replac,ement or repair.

M CW

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Glenn G. Sherwood, Manager l

Safety & Licensing Operation GGS: pes /sj/846 Attachment 81 osos o 55 0 S

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TOPAZ INVERTERS Inverters supplied by Topaz Electronics, used to supply essential divisional power from station batteries to the ECCS transmitter / trip r

unit analog sensors, have failed. The failure is associated with transient disturbances such as those generated on the 125 VDC bus from switching relay coils.

Blown fuses and failed SCR's have occurred as a result of tne transient.

These inverters have been shipped to only one plant, Grand Gulf, for which a substantial safety hazard exists.

At Grand Gulf, failure of all the inverters would prevent automatic initiation of all emergency core cooling systems.

i l

TRR: rf/818 a

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