ML20062K354

Interim Deficiency Rept Re Ite Emergency Diesel Generator Relay Failures.Initially Reported on 820222.Contacts on All Relays to Be Checked & Relay Coils Tested.Next Rept Expected 821119

ML20062K354
Person / Time
Site:	Fermi
Issue date:	07/22/1982
From:	Wells D DETROIT EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, EF2-59380, EFE-59380, NUDOCS 8208170134
Download: ML20062K354 (2)

Text

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Donald A. Wells h

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2 Edison =000 Second Avenuew-July 22, 1982 EF2-59380 Mr. James G. Keppler, Regional Mministrator Region III U.S. Nuclear Regulatory Ccatmission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Subject:

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

Dear Mr. Keppler:

This additional interim report on the cmrgency diesel generator relay failures problem has been prepared to provide you with the current status of this problem.

The 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.

Detroit Edison has had a number of relay failures in the control circuitry of the emergency diesel generator for Division I. On diesel generator number twelve, six of eleven relays tested did not operate properly. The failure of these relays would prevent the diesel generator frm starting. These relays were manufactured by ITE, and were supplied to Fermi 2 by Colt with the diesel generator. These relays were previously located on panels attached to the diesel generator, but were relocated to a separate panel to climinate vibration.

At the present tine, all contacts on al1 relays are to be checked for proper operation. If theru is no continuity through a set of contacts, the two stationary contacts are to be removed; the movable contact and the yoke are to be checked to be sure they move freely. The two stationary contacts shall then be re-installed in the correct position.

A relay is to be replaced if the contacts cannot be properly re-installed er if there is mechanical binding in the yoke movenent.

The relay coils are to be tested. A voltage source shall be applied to the relay coil to determine if the coil develops a strong enough field to pull in the yoke. The value of the test voltage shall be stated in the Start-Up Test Procedure, CAIO.000.045. If the coil field is weak, the coil will be replaced.

8208170134 820722 PDR ADOCK 05000341 AW 3 2 O.e S PDR

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n t e e o

Mr. James G. Keppler, Regional Administrator July 22, 1982 Page %o EF2-59380

- __ Another report on this item, either interim or final, is scheduled to be sent to you on or before November 19, 1982. If you have questions con-

, corning this matter, please contact Mr. G.M. Trahey, Assistant Director -

Project Quality Assurance.

Very truly yours, i

DAW /DEF/cp cc

Mr. Richard DeYoung, Director Office of Inspection and Enforcement Division of Reactor Inspection Programs U.S. Nuclear Regulatory Cmmission Washington, D.C. 20555 Mr. Bruce Little, Resident Inspector U.S. Nuclear Regulatory Cm mission i 6450 North Dixie Highway Newport, Michigan 48166 4

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