![]() |
Search Options | |||
Index | Site Map | FAQ | Facility Info | Reading Rm | New | Help | Glossary | Contact Us | ![]() |
ACCESSION #: 9607300350 ITT Barton ITT Industries 900 S. Turnbull Canyon Rd. AUTOMOTIVE P.O. Box 1882 DEFENSE & ELECTRONICS City of Industry, CA 91749-1882 FLUID TECHNOLOGY Tel: (818)961-2547 Fax: (818) 333-7241 July 25, 1996 Email:ittbarton@fluids.ittind.com Illinois Power Company Clinton Power Station P. O. Box 678 Clinton, IL 61727 Subject: Illinois Power request for failure analysis regarding ITT Barton pump assembly NS109761EQX07 Attention: Mr. Wilfred Connell Vice President 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 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. Sincerely yours, Ted Holdredge Quality Manager ITT Industries Fluid Technology, ITT Barton cc. Document Control Desk Nuclear Regulatory Commission Washington, D.C. 20555 ITT Barton Quality records center Check us out on IndustryNet at http://www.industry.net/itt.barton FAILURE ANALYSIS ILLINOIS POWER COMPANY May 17, 1996 Hydramotor Pump Assembly Model No. NS109761EQX07 Analysis By: R. Conner Register No. Proj. Eng'r COMPLAINT The 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 X07 (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 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 reenergized 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. CORRECTIVE ACTION A review of all consumer reports and after delivery reported problems indicates that this failure 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 engineering feels that no corrective action is required at this time. ILLPWR01 *** END OF DOCUMENT ***