ML20116B925

Part 21 Rept Re Failure Analysis Concerning Pump Assembly NS109761EQX07

ML20116B925
Person / Time
Site:	Clinton
Issue date:	07/25/1996
From:	Holdredge T ITT BARTON
To:	Connell W ILLINOIS POWER CO.
Shared Package
ML20116B926	List: ML20116B925 U-602580, Part 21 Rept Re Itt Barton Hydramotor Actuator Pump Assembly Failed to Develop Hydraulic Pressure During Testing.Caused by Pump Not Being Fitted Properly
References
REF-PT21-96 NUDOCS 9607300350
Download: ML20116B925 (2)

Text

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ITTindustrIJO s ca,om AU10 MOTIVE RO. Bon 1882 DEFENSE & ELECTRONICS City of Industry. CA 917491882 FLUID TECHNOLOGY Tet (8181961-2547

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Fax:(818)333 7241 July 25,1996 Ernait ittbarton@ fluids.ittind com Illinois Power Company Clinton Power Station P.O. Box 678 Clinton, IL 61727

Subject:

Illinois Power request foi failure analysis regarding ITT Barton pump assembly NS109761EQXO7 Attention: Mr. Wilfred Connell Vice President j

Dear Mr. Connell:

ITT Barton performed a failure analysis identifying cause and corrective action regarding the subject pump. The attached analysis dated May 17,1996 indicates that this is considered an isolated case.

I trust that this evaluation performed by ITT Barton will provide Illinois Power the se'.

necessary information to allow the completion of your potentially reportable 10 CFR, part 21.

Additional information regarding this analysis, if needed, may be obtained by contacting the undersigned at your convenience.

Sincerelyy urs,  ;

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Ted oldredge Quality Manager ITT Industries Fluid Technology, ITT Barton

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NecID-ab C$ntEED5E7 ar-t 1 Ndelsar Rbsulatory Commission Washington, D.C. 20555 ITT Barton Quality records center 9607300350 960725 PDR ADOCK 05000461 d"bC 9 f S PDR

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Check us out on IndustryNet at http://www.industy. net /itt.barton

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FAILURE ANALYSIS ILLINOIS POWER COMPANY May 17,1996 Hydramotor Pump Assembly Model No. NS109761 EQX07 Analysis By: R. Conner Register No. Proj. Eng'r. I COMPLAINT Tiie customer stated that the pump assembly failed to cause the actuator to stroke following installation.

CONDITION AS RECEIVED The pump was basically intact, the one exception being that the two fillister head screws that ,

hold the pump together had been loosened, apparently by the customer, during their '

disassembly from the actuator VERIFICATION TEST The two screws were tightened and the pump was placed in the test stand. Since this unit includes the XO7 (120 VAC) solenoid option, a jumper cable was connected to the solenoid valve that vents the amplifier assembly when power is removed. The unit was pumping but would not develop pressure.

With the pump motor turned off, the solenoid was energized and de-energized several times to g' ,

see if the solenoid valve was operating. At first there was no discernible clicking, indicating that the valve was not operating. After several cycles the valve would buzz, then pull in, and after several more cycles the valve pulled in without hesitation. The pump motor was then re-energized and tested. It worked per specification requirements.

CAUSE OF FAILURE The problem encountered in this pump was probably caused by some sort of contamination in the solenoid dump valve assembly where small particles in the oil probably lodged between the solenoid plunger and the tube during transportation and storage. These particles temporarily jammed the solenoid plunger due to the low forces that exist when the air gap between the plunger and pole face is large. By cycling the solenoid several times the contaminant was broken loose from the tube assembly and normal pump operation was restored.

9 CORRECTIVE ACTION l

A review of all consumer reports and after delivery reported problems indicates that this failure l

mode is an isolated case. Because there have been no previously reported pump failures of this kind that could be verified by testing at ITT Barton upon return from the customer, ITT Barton l engineering feels that no corrective action is required at this time.

ILLPWR01

itknois Power Company

' Chnton Power Station P.o. Box 678 Chnton.ll 61727 Tei ai7 935.s623 Fax 217 935 4632 MAY 8' 1996 Wilfred Connell Vice President i

l U-602580 I

4F.140 ILLIN@#1SWER P WC-142-96 May 1, 1996 10CFR21.21 Docket No. 50 461 Document ControlDesk NuclearRegulatory Commission Washington,D.C. 20555 TT Barton 10CFR21 Interim Report 21-96-004:I d

Subject:

Hydramotor ActuatorPump AssemblyFaile to D vel H draulicPr s ur D rin Te in e

Dear Sir:

d tified the failure of a pump assemb tially reportable On March 6,1996, Illinois P ower (IP) tor actuator as a condition poten21. i en es and anITT Barton seriesNH95 hydramo tuator. The function of the pump ht under the provisions of10CFR,Part During testing of the hydramotor actuato installed during an overhaul develop of the ac hydraulic pressure.

d roperly. The IP suspects hydraulic pressure to operate the actuator. mblyis following the overhaul, the pump failed re because it may to not be fitted /porte the pump did not develop pressu X07.

pump assembly has his been returned condition required ti nto toITT underBarton the pro IP has not completed the evaluation of tuntilthe supplier co to develop pressure.

h duled of 10CFR,Part 21 andtion cannot do sodetermine of the pump assemblyis sc ei spec th ITT Barton has informed IP that the inspec1 1996. IP will e eportability to be complete by December h 3, of this issue under the pr when received to determine t e r

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