ML20084D883

AO 50-237/75-26:on 750415,diesel Generator Starting Air Motors Failed to Start Diesel Engine.Caused by Motor Pinion Gears Jamming Against Teeth of Ring Gear Preventing Proper Engagement.Vendor Suggested Mod to Regulate Pressure

ML20084D883
Person / Time
Site:	Dresden
Issue date:	05/23/1975
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
324-75, 5943, AO-50-237-75-26, NUDOCS 8304120643
Download: ML20084D883 (4)

Text

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, ,~ - Comm:nwe:lih Edison One' '1 National Plata. Chicago, lihnojs Adiws Reply to: Post Offica Box 767

.- Chic"go. Illinois 60690 EES Ltr. A324-75 Dresden Nuclear Fower Station R. R. #1 Morris, Illinois 60450 .s i #' I ko May 23, 1975 ,"

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!?r. Ja~.cs G. Keppler, Regional Director .

Directorate of Regulatory Operation-Region III y . ;.y ,C'y U. S. Nuclear Regulatory Co:=ission

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S" EJECT: REICRT OF AE;0R*/.AL OCCURRD!CE PER SECTION 6.6. A 0F TuE TECRIICAL SFZCIFICATIC::S U-2 DIE 3EL GE;ERATOR STARTING AIR MOTOR P!dLURE

References:

1) Regulatory Guide 1.16 Rev. 1 Appendix A

2) Notification of Region III of U. S. Nuclear Regulatory Commission Telephone: P. Johnson, 1050 hours0.0122 days <br />0.292 hours <br />0.00174 weeks <br />3.99525e-4 months <br /> on May 16, 1975 Telegram: J. Keppler, May 16, 1975

3) Drawing Number M173

4) Letter from 3. B. Stephensen to J. Keppler, Report Number 50-237/1975-16 Report ::u .tcr: 50-237/1975-26 Report Date: Fay 23, 1975

, Cecu rence Date I.pril 15, 1975 Facility: Dresden Nuclear Power Station, Morris, Illinois 60450 IDE;TIFICATICN CF OCCURRDICE The Unit-2 diesel generator starting air motors failed to start the diesel engine. This failure represents a condition which could have prevented the intended function of an enginecred safety feature system. This incident was not reported initially as the diesel-gencrator was out of service for unrelated repairs. Subsequent review resulted in declaring it a reportable occurrence.

CONDITIONS PRIOR TO OCCURRM CE Unit-2 was in the cold shutdown mode during an extended refueling outage.

8304120643 750523 PDR ADOCK 05000237 F*ol;3 S PDR

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May 23, 1975 6

Mr. James G. Keppler o

D$CRIPTIO!! 0F OCCURRD'CE ,

On April 15, 1975 the Unit-2 diesel generator starting air motor failed to start the diesel while attempting to return it to service following repairs to the field finshing circuit.

DESIGNATIO: OF APPAM CAUSE OF OCCURRD CE (Component Failure)

The diesel generator failure resulted when the air start motors' pinion gears ja:=ed against the teeth of the ring gear preventing proper engagement. 1 A representative from Ingersoll-Rand investigated the problem and concluded that tk.e pilot air pressure used to engage the pinion gears and the ring gear is too high, causing the teeth to jam occasionally.

/E.ALYSIS OF CCCURRE CE Unit-2 was in a refueling outage and no work was being donc that had potential for draining the core. Therefore, the health and safety of the public were not jeopardized by this occurrence.

CORRECTIVE ACTION A modification has been sugst:sted by Ingersoll-Rand which involves regulating the pilot air pressure to approximately 80 psig. This will cause the pinion scars to engage more slowly, allowing them to mesh properly. Initiation of this modification is contingent upon a detailed recommendation from Ingersoll-Rand which is expected soon.

FAILURE DATA This same problem occurred on Unit 2 diesel generator in F. arch of 1975 (I?o. 50-237/1975-16). At that time, the air start motors were believed to be defective and were returned to the factory. The air start motors are manufactured by Ingersoll-Rand and are rated 247 hp at 200 psi.

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