ML20084J532

Ro:On 721210,small Open Flame Discovered within 1B RHR Svc Water Pump Motor Between Stator Windings & Motor Housing. Caused by Oil Soaked Portion of Fiberglass noise-absorbing Insulation on Top of Stator.Insulation Replaced

ML20084J532
Person / Time
Site:	Quad Cities
Issue date:	12/20/1972
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084J535	List: ML20084J532 ML20084J536
References
BBS-72-26, NUDOCS 8305130358
Download: ML20084J532 (2)

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we:lth Edison

• Quad Cities Nuclear Pow:rSt tion Post Othee Box 216 e

'@Com Cordova, Illinois 61242 Telephone 309/654-2241

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,, Of,og December 20, 1972 o2 Mr. A. Giambusso Deputy Director for Reactor Projects ,

Directorate of Licensing U. S. Atorf c Energy Commission Washington, D. C. 20545

Reference:

Quad-Cities Nuclear Power Station Unit 1 Docket No. 50-254, DPR-29 Appendix A, Sections 1.0.A.2, 3.5.B. and 6.6.B.3.

Dear Mr. Giambusso:

The purpose of this letter is to inform you of the details regarding the small fire encountered in the IB RHR service water pump motor. .The fire took place at approximately 10:00 a.m. on December 10, 1972.

DESCRIPTION OF FJfEE 1

At the time of the fire the Unit I reactor was operating under steady state conditions at approximately.90*' j power.

Contractors, werking on the construction of the condensate

, pump room flood protection modification, were welding and flame cutting in the immediate vicinity of the pump when I they noticed traces of smoke coming from within the' motor Q housing. Closer observation revealed a suali open flame within the motor between the stator windings and the motor housing. The contractors'immediately extinguished the flames

@[ y and notified operating personnel in the control room. The-10 RHR service water pump and its corresponding motor heater were taken out of service and the three remaining RHR ser-vice water pumps were demonstrated to be operable in ac-cordance with Technical Specification 4.5.B.2. .

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Hr. A. Giambusso December 20, 1972 INVESTIGATION Initially it was suspected that the fire started due to an

electrical fault. Subsequent mcggering of the motor leads "

both from phase to phase and each phase to ground gave '

norrnal results indicating no problems with the electrical wiring and insulation. Further investigation disclosed j an oil soaked portion of fiberglass noise absorbing in- i sulation, on top of the stator, between the stator windings and the r.ator housing. The only visible damage sustained by the motor was c small portion of charred insulation and some of the varnish coating on the stator windings was slightly discolored.

The motor bearings and seals were inspected and the motor was found to be mechanically sound and in normal operating condition. The source of the oil which soaked the insu-lation cannot be definitely identified. However, it is a possibility that the oil soaked insulation was a result of the condensate pump room flood which occurred on June 9, 1972 The final conclusion to be drawn is that the fire was started by sparks from the welding and cutting operations which were blown into the motor by a nearby fan which was blowing in the direction of the motor.

CORRECTIVE ACTION The oil soaked insulation on the IB RHR service water pump was removed and replaced with new, and the motor thoroughly inspected. After reassembly the motor was functionally tested and performed satisfactorily.

The remaining RHR service water pumps, lA, C, and D, were l also inspected and found to be clean, dry, and in excellent condition.

No further actior; on the fire is anticipated at this time.

Very trul ours, f y <

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