ML20086D776

Special Rept:On 950607,Unit 1B DG Started for Monthly Operability Run & Approx 10 Seconds Later,Tripped Due to Operator Error.Equipment Operator-in-Training Counseled & Surveillance Performed Satisfactorily

ML20086D776
Person / Time
Site:	LaSalle
Issue date:	07/07/1995
From:	Ray D COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9507100373
Download: ML20086D776 (2)

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.Commonweahh fdivsn Company

~( .# Iasafie Generating Station

,p~ 2(4i North 2Ist Road Marsemes, 11.613614757

, Tel Hl8).3574C61 July 7,1995 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D. C. 20555 O

This special report is submitted in accordance with LaSalle Unit 1 Operating Ucense NPF-11, Appendix A, and Technical Specifications 4.8.1.1.3 and 6.6.C regarding Unit 1B Diesel Generator (E22,1E22S001), manufactured by Electro-Motive Division of General Motors Corporation (Model EMD 20654E4).

On June 7,1995, with LaSalle Unit 1 at 100% power, the Unit 1B Diesel Generator (DG) was started in accordance with LaSalle Operating Surveillance LOS-DG-M3, "1B(28) DG Operability Run", for a monthly -

operability run. Approximately 10 seconds later, the 1B DG tripped and the IB DG Overspeed Trip Annunciator illuminated. Further investigation by System Engir'eering and Operating personnel identified an actual overspeed i trip. This failure was not a valid failure in accordance with Regulatorv Guide i 1.108 and Technical Specification 4.8.1.1.3. j I

The cause of the 1B DG trip was operator error. An Equipment Operator-in-Training was operating the fuel racks for the first time during the initial engine warm up period. Instead of pulling back on the fuel racks to slow the engine l down to allow for a slow warm up of the engine, he inadvertently pushed in on the fuel racks thus overspeeding the engine. After the trainee was counseled on the event, the surveillance was subsequently performed satisfactorily. Upon rese; ting the overspeed trip lever and the lockout relay, the 1B DG was successfully operating in accordance with LOS-DG-M3 and retumed to service.

l Li00:13 9507100373 950707 PDR S ADDCK 05000373 PDR /

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i Equipment Operator diesel generator training will be modified to reduce the chance of recurrence. Additionally, On-the-Job Trainer training will be l: evaluated to ensure proper emphasis is placed on the trainer's responsibility ' )

l- to be in position to take act'*q to preclude inappropriate system operation.  !

j Sincerely,

(

D.J. Ray N I

-l Station Manager LaSalle County Station DJR/CTK/lja l cc- H. J. Miller, NRC Region 111 Administrator P. G. Brochman, NRC Senior Resident inspector, LaSalle R. J. Zuffa, IDNS Resident inspector l INPO - Records Center  !

D. L Farrar, Nuclear Regulatory Service Manager, NORS l Central File i

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