ML20066K717

Final Deficiency Rept Re Emergency Diesel Generator Relay Failures.Initially Reported on 820222.Caused by Stationary Contacts Falling Out During Moving & Improper Reinstallation When Remounted.Relays Reworked,Inspected & Retested

ML20066K717
Person / Time
Site:	Fermi
Issue date:	11/19/1982
From:	Wells D DETROIT EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, EF2-60512, NUDOCS 8211290632
Download: ML20066K717 (2)

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November 19, 1982 EF2-60512 Mr. James G. Keppler, Regional Administrator Region III U.S. Nuclear Regulatory Ccmnission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Subject:

Final Report of 10CFR50.55(e) Item on Emergency Diesel Generator Relay Failures (#59)

Dear Mr. Keppler:

This is Detroit Edison's final report on the emergency diesel generator relay failures. This problem was originally reported to Mr. P. Pelke of NRC Region III by Detroit Edison's Mr. H.A. Walker, Supervisor-Construction Quality Assurance, on February 22, 1982.

The reported failures were in the control circuitry of the division 1 emer-gency diesel generator numbers eleven and tw31ve. The ITE relays did not actually fail. However, they did not operate properly during initial start-up testing. The problem occurred when the relays were removed from a panel located in the diesel generator base, and relocated in a new panel in the second floor switchgear rom. In the process of moving the relays, the stationary contacts fell out of the relays and were improperly re-installed when they were remounted.

The electricians were trained on the proper procedure for the installation of the contacts. The relays were then reworked, inspected and retested successfully. If you have further questions, please contact Mr. G.M. Trahey, Assistant Director-Project Quality Assurance.

Very truly yours, DAW /DF/cp 8211290632 821119 gyg219M PDR ADOCK 05000341 S PDR

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e Mr. Janes G. Keppler, Regional Administrator November 19, 1982 Page Two EF2-60512 cc: Mr. Richard DeYoung, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Cm mission Washington, D.C. 20555 Mr. Bruce Little, Senior Resident Inspector U.S. Nuclear Regulatory Ccanission 6450 North Dixie Highway Newport, Michigan 48166