United States Nuclear Regulatory Commission - Protecting People and the Environment

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


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