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ACCESSION #: 9503160195 ITT ITT Barton ITT Fluid Technology Corporation January 20, 1995 U.S. Nuclear Regulatory Commission Washington, D.C. 20555 ATTN: Director, Office of Nuclear Material and Safeguards Subject: Interim Report of Potential Defect Reference: Interim Report dated December 19, 1994 ITT Barton, City of Industry CA, is a supplier of basic components to the Nuclear Power Industry. The specific components being reported are Indicating Switches, Models 288A and 289A. These Indicating Switches were qualified for safety related applications per ITT Barton Engineering Reports R3-288A-1, dated May 1990, and R3-288A-13, dated September 1986. In reviewing seismic test data recorded last year for ITT Barton Model 288A and 289A Indicating Switches, ITT Barton determined that these Products may demonstrate switch contact chatter not identified during previous nuclear qualification efforts associated with these devices. Seismic testing documented in R3-288A-1 and R3-288A-13 included five OBE's and one SSE at 6 G's and 12 G's respectively. ITT Barton has completed testing at Wyle Laboratories in Norco, CA which has confirmed the identified potential concerns regarding switch contact chatter at elevated seismic loadings. This interim report is being issued to present the results of this recent testing in a timely manner. The attachment presents the now known switch performance characteristics for various seismic loadings which will allow the instrument users to evaluate their specific installations for safety implications. A final will be made by February 15, 1995, If there are any questions regarding this interim notification, please contact Jerry Anderson at (818) 961-2547. Charles L. Perry General Manager Attachment 900 South Turnbull Canyon Road, P.O. Box 1882, City of Industry, CA 91749-1882 10CFR21 NOTIFICATION (January 20, 1995) ITT Barton is a supplier of basic components used in safety related applications in Nuclear Power Plants. ITT Barton has supplied Model 288A and 289A Differential Pressure Indicating Switches to Nuclear Power Plants with Certification to IEEE-323/344 Qualifications which indicate there is no switch contact chatter during seismic loadings of up to 12 G's as long as the monitored differential pressure is at least 10% of full scale away from the switch setpoint when the seismic event occurs. In recently performed unrelated testing, potential concerns regarding contact chatter were identified which resulted in performance of additional testing on qualified configurations of these Products. Switch contact chatter sensitivity testing has been performed on IEEE-323 & IEEE-344 qualified versions of ITT Barton Model 288A and 289A Differential Pressure Indicating Switches at Wyle Laboratories in Norco, California during the first week of 1995. This testing has again verified that these Products are capable of surviving earthquake loadings up to 12 G's with no degradation in structural or pressure boundary integrity and no degradation in functionality with regard to pointer accuracy, switch setpoint change and switch deadband. However, this testing has also verified the recently identified concern that the contacts in the high and low switches may chatter when subjected to elevated seismic loadings. The occurrence of chatter and the contact opening duration has been determined to be dependent an the switch operating forces, the switch setpoint with respect to the monitored process condition at the time of the event, and the acceleration level of the earthquake. Switch performance characteristics in the form of contact chatter duration for various G-level loadings are presented in the following table as a function of the distance (% of full scale) of the monitored differential pressure from the switch setpoint at the time of the seismic event occurrence. This data conservatively considers instrument configurations and switches most sensitive to chatter. MODEL 288A & 289A SWITCH CHATTER DURATION'S G SETPOINT / POINTER POSITION (% FS) LEVEL 10% 15% 20% 25% 4 None None None None 6 = 80 ms None None None 8 >= 80 ms >= 40 ms None None 10 >= 80 ms >= 80 ms >= 5 ms None 12 >= 80 ms >= 80 ms >= 80 ms >= 5 ms Note: No chatter is defined as contact opening duration's >< 2 milliseconds per IEEE-C37.105, "IEEE Standard for Qualifying Class 1E Protective Relays and Auxiliaries for Nuclear Power Generating Stations." A formal Engineering Report will be available to interested Customers by the end of the first quarter of this year which will document all the findings of this recent testing effort. Page 1 of 1 GENERAL INFORMATION or OTHER EVENT NUMBER: 28267 LICENSEE: ITT BARTON INDUSTRIAL SALES NOTIFICATION DATE: 01/23/95 CITY: GLENWOOD REGION: 3 NOTIFICATION TIME: 17:09 [ET] COUNTY: STATE: IL EVENT DATE: 12/19/94 LICENSE#: AGREEMENT: Y EVENT TIME: 12:00 [CST] DOCKET: LAST UPDATE DATE: 01/23/95 NOTIFICATIONS NRC NOTIFIED BY: Debbie DelBoro HQ OPS OFFICER: JOHN MacKINNON EMERGENCY CLASS: NOT APPLICABLE 10 CFR SECTION: CDEF 21.21(b)(2) DEFECTS/NONCOMPLIANCE EVENT TEXT SEISMIC TEST DATA REVEALED THAT SWITCH CONTACT CHATTER MAY DEVELOP IN ITT BARTON MODEL 288A & 289A INDICATING SWITCHES DURING A SEISMIC EVENT. BARTON INDUSTRIAL SALES, 349 WEST 195th ST., P.O. BOX 466, GLENWOOD, IL SENT THE FOLLOWING FACSIMILE FOR ONE OF ITS SUBSIDIARY (ITT BARTON, CITY OF INDUSTRY, CA). "ITT BARTON IS A SUPPLIER OF BASIC COMPONENTS USED IN SAFETY RELATED APPLICATIONS IN NUCLEAR POWER PLANTS. ITT BARTON HAS SUPPLIED MODEL 288A & 289A DIFFERENTIAL PRESSURE SWITCHES TO NUCLEAR POWER PLANTS WITH CERTIFICATION OF IEEE-323/344 QUALIFICATIONS WHICH INDICATE THERE IS NO SWITCH CONTACT CHATTER DURING SEISMIC LOADINGS OF UP TO 12 G's AS LONG AS THE MONITORED DIFFERENTIAL PRESSURE IS AT LEAST 10% OF FULL SCALE AWAY FROM THE SWITCH SETPOINT WHEN THE SEISMIC EVENT OCCURS. IN RECENTLY PERFORMED UNRELATED TESTING, POTENTIAL CONCERNS REGARDING CONTACT CHATTER WERE IDENTIFIED WHICH RESULTED IN PERFORMANCE OF ADDITIONAL TESTING ON QUALIFIED CONFIGURATIONS OF THESE PRODUCTS. SWITCH CONTACT CHATTER SENSITIVITY TESTING HAS BEEN PERFORMED ON IEEE-323 & IEEE-344 QUALIFIED VERSIONS OF ITT BARTON MODEL 288A & 289A DIFFERENTIAL PRESSURE INDICATING SWITCHES AT WYLE LABORATORIES IN NORCO, CALIFORNIA DURING THE FIRST WEEK OF 1995. THIS TESTING HAS AGAIN VERIFIED THAT THESE PRODUCTS ARE CAPABLE OF SURVIVING EARTHQUAKE LOADING UP TO 12 G's WITH NO DEGRADATION IN STRUCTURAL OR PRESSURE BOUNDARY INTEGRITY AND NO DEGRADATION IN FUNCTIONALITY WITH REGARD TO POINTER ACCURACY, SWITCH SETPOINT CHANGE AND SWITCH DEADBAND. HOWEVER, THIS TESTING HAS ALSO VERIFIED THE RECENTLY IDENTIFIED CONCERN THAT THE CONTACTS IN THE HIGH AND LOW SWITCHES MAY CHATTER WHEN SUBJECTED TO ELEVATED SEISMIC LOADINGS. THE OCCURRENCE OF CHATTER AND THE CONTACT OPENING DURATION HAS BEEN (Continued on next page) LICENSEE: ITT BARTON INDUSTRIA PAGE # 2 OF EVENT NUMBER: 28267 DETERMINED TO BE DEPENDENT ON THE SWITCH OPERATING FORCES, THE SWITCH SETPOINT WITH RESPECT TO THE MONITORED PROCESS CONDITION AT THE TIME OF THE EVENT, AND THE ACCELERATION LEVEL OF THE EARTHQUAKE. A FORMAL ENGINEERING REPORT WILL BE AVAILABLE TO INTERESTED CUSTOMERS BY THE END OF THE FIRST QUARTER OF THIS YEAR WHICH WILL DOCUMENT ALL THE FINDINGS OF THIS RECENT TESTING EFFORT." A COPY OF THIS PART 21 REPORT HAS BEEN FAXED TO WALTER HAASS OF NRR/TQMB. *** END OF DOCUMENT ***