Part 21 Report - 1995-052
ACCESSION #: 9502210142 ITT ITT Barton ITT Fluid Technology Corporation February 15, 1995 U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTN: Director, Office of Nuclear Material and Safeguards Subject: Final Report of Potential Defect (Model 288A & 289A Switch Chatter) References: Interim Report of Potential Defect dated January 20, 1995 ITT Barton is a supplier of basic components to the Nuclear Power Industry. The specific components being reported are Model 288A and 289A Differential Pressure Indicating Switches. These indicating switches were qualified for safety related applications per ITT Barton Engineering Reports R3-288A-1, dated May 1980, and R3-288A-13, dated September 1996 (seismic testing 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 that these products may demonstrate switch contact chatter not identified during previous nuclear qualification efforts associated with these devices. Attachment A 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. The cause of this situation is attributed to use of test equipment with insufficient sensitivity to detect the existence of chatter. ITT Barton has reviewed all other test reports where switch chatter testing methodology could potentially be a concern and has found that the test methodologies implemented clearly meet the industry standards for contact chatter monitoring sensitivity (i.e., 2 milliseconds). Attachment B is a list of Customers who have Purchased Model 288A and/or Model 289A Indicating Switches within the past 10 years. We are now notifying each of these customer of this concern. If there are any questions regarding this notification, please contact Jerry Anderson at (818) 961-2547. Charles L. Perry General Manager Attachments A and B 900 South Turnbull Canyon Road, P.O. Box 1882, City of Industry, CA 91749-1882 (illegible print) Attachment A 10CFR21 NOTIFICATION (February 15, 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 on the switch operating forces, the switch setpoint with respect to the monitored process condition (i.e, actual differential pressure 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 DP WITH RESPECT TO SETPOINT LEVEL >/= 10% FS >/= 15% FS >/= 20% FS >/= 25% FS 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 Notes: 1. Contact chatter may occur whenever the differential pressure is within 10% of the switch setpoint due to switch deadband and seismic induced setpoint shift. 2. 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 Attachment B LISTING OF CUSTOMERS FOR MODEL 288A AND/OR MODEL 289A INDICATING SWITCHES PURCHASED FROM ITT BARTON SINCE 1984 ABB COMBUSTION ENGINEERING ALABAMA POWER (SO. NUCLEAR OPERATING COMPANY) ALLEGHANY POWER AMERICAN ELECTRIC APPALACHIAN POWER ARIZONA PUBLIC SERVICE ARKANSAS EASTMAN CO. ARKANSAS POWER & LIGHT (ENTERGY) ATLANTIC CITY ELECTRIC BABCOCK & WILCOX BAILEY CONTROLS BALDWIN ASSOCIATES BALTIMORE GAS & ELECTRIC BECHTEL BIG RIVER ELECTRIC BIS BOSTON EDISON BROWN & ROOT BURNS & ROE BUFFALO ELECTRIC CONSTRUCTION CANAL ELECTRIC CAROLINA POWER & LIGHT CENTRAL POWER & LIGHT CENTRAL ILLINOIS PUBLIC CINCINNATI GAS CLEVELAND ELECTRIC COMISION DE FEDERALE COMMONWEALTH EDISON COMSIP DELPHI CON EDISON CONSUMERS POWER CTI NUCLEAR INC. DALLAS POWER & LIGHT DANIEL CONSTRUCTION DAVY POWERGAS INC. DAYTON POWER & LIGHT DETROIT EDISON DUKE POWER DUQUESNE LIGHT EBASCO FAYETTE POWER PROJECT FLORIDA POWER CORP. FLORIDA POWER & LIGHT FLUOR ENGINEERS GENERAL ELECTRIC GEORGIA POWER GILBERT ASSOCIATES, INC. GPU NUCLEAR GULF STATES HARRISON POWER HOUSTON LIGHTING & POWER ILLINOIS POWER INDIANA MICHIGAN (AMERICAN ELECTRIC) INDIANAPOLIS POWER & LIGHT IOWA PUBLIC SERVICE JERSEY CENTRAL POWER JOHNSON SERVICE JOHNSON CONTROL (JOHNSON YOKOGAWA) KANSAS CITY POWER & LIGHT KEPCO (KOREA ELECTRIC) (S.O.R.) KNOLLS ATOMIC POWER KPL GAS SERVICE LONG ISLAND LIGHTING LOUISIANA POWER & LIGHT (ENTERGY) LOUISVILLE GAS & ELECTRIC MAINE YANKEE ATOMIC POWER MERCURY COMPANY METROPOLITAN EDISON MILLSTONE POINT CO. MINNESOTA POWER & LIGHT MISSISSIPPI POWER NEBRASKA PUBLIC POWER NEW HAMPSHIRE YANKEE (YANKEE ATOMIC ELECTRIC) NEW YORK POWER AUTHORITY NEW ENGLAND POWER NEW YORK ELECTRIC & GAS NIAGARA MOHAWK NORTHEAST UTLITIES NORTHERN STATES POWER NUCLEAR SERVICES CORP. OHIO EDISON CO. OHIO POWER ORANGE & ROCKLAND UTILITIES PACIFIC POWER PACIFIC GAS & ELECTRIC PECO (PHILADELPIA ELECTRIC) PENNSYLVANIA POWER & LIGHT PENNSYLVANIA ENGINEER CORP. PORTLAND GENERAL ELECTRIC POTOMAC ELECTRIC POWER ASSOCIATES, INC. PUBLIC SERVICE OF NEW HAMPSHIRE PUBLIC SERVICE ELECTRIC & GAS RALPH M. PARSONS ROCHESTER GAS & ELECTRIC SALT RIVER PROJECT SAN DIEGO GAS & ELECTRIC SEATTLE CORPS ENGINEERING SMUD SO. LAKE TAHOE PUBLIC UTILITY SO. CAROLINA ELECTRIC & GAS SO. CALIFORNIA EDISON ST. JOSEPH LIGHT & POWER STONE & WEBSTER TAMPA ELECTRIC TEXAS MUNICIPAL POWER TOLEDO EDISON TU ELECTRIC (TEXAS UTILITIES) TVA UNION ELECTRIC UNITED NUCLEAR UNITED ILLUMINATING UNITED ENGINEERING UTAH POWER UTILITY POWER CORP. VEPCO (VIRGINIA ELECTRIC) WESTINGHOUSE WISCONSIN MICHIGAN POWER WISCONSIN PUBLIC SERVICE WISCONSIN ASSOCIATES WOLF CREEK WPPS (WASHINGTON PUBLIC) YORK ELECTRO PANEL *** END OF DOCUMENT ***
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