United States Nuclear Regulatory Commission - Protecting People and the Environment


ACCESSION #: 9706050002



Rosemount Nuclear Instruments      Rosemount Nuclear Instruments, Inc.

                                   12001 Technology Drive

                                   Eden Prairie, MN 55344 USA

May 23, 1997                       Tel 1 (612) 828-8252

                                   Fax 1 (612) 828-8280



Re:  Notification under 10 CFR Part 21 for Model 710DU0CL Trip Calibrator



Pursuant to 10CFR Part 21 Paragraph 21.21 (b), Rosemount Nuclear

Instruments, Inc. (RNII) is writing to inform you of a potential

nonconformance related to certain model 710DU0CL Trip Calibrators.

The circuit boards supplied to RNII and used in assembly of the trip

calibrator may contain test select resistors manufactured by a

non-approved supplier.  The affected test select resistors are at

locations R42, R45, and R47.



Model 710 Trip Calibrators supply the current used to calibrate trip

levels in 710 Master and Slave Trip Units.  The test select resistors set

the positive and negative calibration current ramp rate.



The 710 Trip Calibrators passed all functional testing prior to shipment

and RNII is not aware of any failures in the field due to the alternate

test select resistors.



1.0  Name and address of the individual providing the information:



     Mark Van Sloun

     Vice President & General Manager

     Rosemount Nuclear Instruments, Inc.

     12001 Technology Drive

     Eden Prairie, MN 55344



2.0  Identification of items supplied:



     Certain Model 710DU0CL Trip Calibrators identified in Attachment A.



3.0  Identification of firm supplying the item:



     Rosemount Nuclear Instruments, Inc.

     12001 Technology Drive

     Eden Prairie, MN 55344



FISHER-ROSEMOUNT



10CFR21 Notification

May 23, 1997

Page 2 of 3



4.0  Nature of the failure and potential safety hazard:



     This notification relates to Model 710DU0CL Trip Calibrators with

     test select resistors in locations R42, R45, and R47 manufactured by

     non-approved suppliers.



     RNII does not have sufficient information to determine the safety

     impact related to plant applications.  Licensees must determine the

     impact on plant operations and plant safety and take action as

     deemed necessary.



5.0  Corrective action which is taken, the name of the individual or

organization responsible for that action and the length of time taken to

complete that action:



     The 710DU0CL Trip Calibrators listed in Attachment A should be

     returned to RNII for replacement of the non-approved test select

     resistors.  Contact RNII Nuclear Marketing at (612) 828-8252 for

     return information.



     RNII's supplier of the subassembly for the 710DU0CL will remove all

     test select resistors from the assembly area so that the approved

     part must be requested for each subassembly from the material crib.

     This action will be implemented immediately.



     No further action related to this issue is expected.  Mr.  Van Sloun

     is responsible should any further action related to this issue be

     necessary.



6.0  Any advice related to the potential failure of the item:



     When a Readout Assembly is installed in the Trip Calibrator, the

     readout display locks if a trip occurs from the Master or Slave

     during calibration.  The test select resistors set the positive and

     negative calibration current ramp rate and unreliable resistance

     values could cause a change in ramp rate.  If the ramp rate of the

     calibration current increases to a value outside of the

     specification, the accuracy of the current displayed by the readout

     will decrease.



     The end user must determine the full scope of this nonconformance as

     it relates to plant operations and plant safety and take action as

     deemed necessary.



FISHER-ROSEMOUNT



10CFR21 Notification

May 23, 1997

Page 3 of 3



Rosemount Nuclear Instruments, Inc. has a strong commitment to the

nuclear industry and assures you that we are dedicated to the supply of

high quality products and services to our customers.  We are sorry for

any inconvenience.  If there are any questions, or you require additional

information related to this issue, please contact Jerry Edwards, Ian

Baldry, or Mike Dougherty at (612) 828-8252.



Sincerely,



ROSEMOUNT NUCLEAR INSTRUMENTS, INC



M. L. Van Sloun

Vice President & General Manager



encl.: Attachment A



FISHER-ROSEMOUNT



                              Attachment A

                10CFR21 - Notification Dated May 23, 1997

                            GE Nuclear Energy



PO NUMBER               MODEL NUMBER            SERIAL NUMBER



205-96C012               0710DU0CL                0512614



205-96C012               0710DU0CL                0512615



FISHER-ROSEMOUNT



                              Attachment A

                10CFR21 - Notification Dated May 23, 1997

                   Carolina Power & Light - Brunswick



PO NUMBER              MODEL NUMBER            SERIAL NUMBER



8K8989CJ                 0710DU0CL                0513056

8K8989CJ                 0710DU0CL                0512901

8K8989CJ                 0710DU0CL                0512902

8K8989CJ                 0710DU0CL                0512903

8K8989CJ                 0710DU0CL                0512979

8K8989CJ                 0710DU0CL                0512980

8K8989CJ                 0710DU0CL                0512981

8K8989CJ                 0710DU0CL                0512982

8K8989CJ                 0710DU0CL                0512984

8K8989CJ                 0710DU0CL                0512985

8K8989CJ                 0710DU0CL                0512986

8K8989CJ                 0710DU0CL                0513192



FISHER-ROSEMOUNT



                              Attachment A

                10CFR21 - Notification Dated May 23, 1997

                  Entergy Operations Inc. - Grand Gulf



PO NUMBER              MODEL NUMBER             SERIAL NUMBER



MP96G077                 0710DU0CL                0512891

MP96G077                 0710DU0CL                0513256

MP534810                 0710DU0CL                0512556



FISHER-ROSEMOUNT



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