ML19256F011

Responds to IE Bulletin 79-23.Static Excitation Sys Presents No Low Impedance Path for Circulation of Third Harmonic Currents.Facility Not Susceptible to Diesel Generator Failure Described in Bulletin

ML19256F011
Person / Time
Site:	Marble Hill
Issue date:	10/25/1979
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 7911160561
Download: ML19256F011 (1)

Text

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.h PUBLIC SERVICE INDIANA October 25, 1979 S. W. Shields Vice President Electric System Mr. James G. Keppler U.S. Nuclear Regulatory Connission Docket Nos.: STN 50-546 Region III STN 50-547 799 Roosevelt Road Construction Permit Nos.:

Glen Ellyn, Illinois 60137 CPPR-170 CPPR-171 Marble Hill Nuclear Generating Station, Units 1 & 2 IE Bulletin No. 79-23

Dear Mr. Keppler:

In response to IE Bulletin No. 79-23, Public Service Company of Indiana, Inc. (PSI) has determined that the reported problem does not apply to the Marble Hill diesel generators.

The Marble Hill diesel generators employ a static excitation system which obtains power via a single phase, ungrounded transformer fed from the generator output. This system and configuration presents no low impedance path for circulating third harmonic currents as described in the subject bulletin.

Si erely,

/ . ,

S. W. Shields PAB:j b cc: U. S. Nuclear Regulatory Con: mission Office of Inspection & Enforcement Division of Reactor Operations Inspection Washington, D. C. 20555 E. R. Schweibinz, P.E. })k2 g,3'b 1000 East Main Street, Plainfield, Indiana 46168 317 2 me, 56, L 1