ML19291C508

Submits Revised Response to IE Bulletin 79-23, Potential Failure of Emergency Generator Field Exciter Transformer. Subsequent Review of Response Determined That Diesel Generators Employ Brushless Excitation Sys

ML19291C508
Person / Time
Site:	Marble Hill
Issue date:	01/02/1980
From:	Shields S PSI ENERGY, INC. A/K/A PUBLIC SERVICE CO. OF INDIANA
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
IEB-79-23, NUDOCS 8001240520
Download: ML19291C508 (1)

Text

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PUBLIC SERVICE INDIANA January 2, 1980 S. W. Shields Vice President . Electric Sygem Mr. James G. Keppler, Director Docket Nos.: STN 50-546 U.S. Nuclear Regulatory Commission STN 50-547 Regi n III Construction Permit Nos.:

799 Roosevelt CPPR-170 Gien Ellyn, Illinois 60137 CPPR-171 Marble Hill Nuclear Generating Station, Units 1 & 2 IE Bulletin Nc. 79-23

Dear Mr. Keppler:

In our October 25, 1979 response to IE Bulletin No. 79-23, Public Service Company of Indiana, Inc. (PSI) had stated that the reported problem does not apply to the Marble Hill diesel generators.

We also stated that the Marble Hill diesel generators employ a static ex-citation system, which obtains power via a single phase, ungrounded trans-former fed from the generator output. Subsequent review of our response has determined that this is actually a brushless excitation system. This revision of our response is provided for accuracy and in no way alters our conclusion that the reported problem does not apply to Marble Hill.

Sincerely,

. W. Shields TDG:jb cc: U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, D. C. 20555 E. R. Schweibinz, P.E.

1793 197 jANo 198b 1000 East Main Street, Plainfield, Indiana 46168 317. 839 .9611 8 001240 h