United States Nuclear Regulatory Commission - Protecting People and the Environment


ACCESSION #: 9708080191



MGP

INSTRUMENTS



Suite 150

15000 Highlands Parkway

Smyrna, GA 30082

Tel: (770) 432-2744

Fax: (770) 432-9179



Via: Fax and Courier

5 August 1997



US NRC Headquarters Operations Center

Document Control Desk

Nuclear Regulatory Commission

Washington DC 20555



Subject:  10 CFR 21.21 Notification. MGP Instruments Inc.

          Radiation Monitoring System, power supply circuit board is

          subject to premature electronic component failure



Dear Madam or Sir,



On 12 June 1997 MGP Instruments Inc. (MGPI Inc.) became aware of a

potential safety related defect involving a power supply board installed

in a family of local processing units (LPU).  These LPUs were delivered

for use in a safety related application as part of a radiation monitoring

system.  Although it has been confirmed that the equipment is not in

active service, MGPI wishes to formally notify the commission, and the

affected utility, in accordance with the requirements of 10 CFR Part 21.



During field maintenance of local processing units (used in a European

non-safety related application), MGP Instruments Inc's sister

organization (MGPI SA) advised that some of the power supply boards were

found to have an electronic component failure.  No such failure had been

observed by MGP Instruments Inc.  applications, within the US, prior to

the information received.



28 LPUs of a similar design, which contain the power supply circuit

board, with the suspect component, were qualified for use in a safety

related application and delivered to Southern California Edison for use

at their San Onofre Nuclear Generation Station.



MGP Instruments Inc.  has completed a technical review and concluded that

the diode VD-9 (model 1N4148), installed on the MGPI proprietary power

supply boards (part nos. RMS-9077-SR and RMS-9068-SR), is susceptible to

failure during equipment start-up.  This failure is due to the

insufficient rating of the diode under transient conditions (non-

repetitive peak forward current).



Failure of diode VD-9 will result in a loss current passing through the

coil of electronic relay K1. Following diode failure, the relay will not

be energized, and the battery required for the processor's,

memory back up will not be charged.  Accordingly, following eventual

battery discharge, the LPU may be unable to re-start with correct

operational parameters.



The safety related application of this device is limited to its

installation in the 28 units at Southern California Edison's San Onofre

Nuclear Generating Station (serial number listing indicated in attachment

A). A recent inquiry to the utility indicated that the affected equipment

has not been commissioned and is not yet in service, (see attachment B).

The diode will be replaced with an appropriate component, by MGPI's

qualified technicians, in accordance with documented procedures, prior to

the commissioning of the equipment.



Nuclear Regulatory Commission                                     Page: 2



MGP Instruments Inc.  is providing the following in accordance with 10

CFR 21.21 (c) (4).  Initial notification of this matter will be provided

by facsimile of this letter to the NRC Operations Center in accordance

with 10 CFR 21.21 (c) (3) within two (2) days of the date the responsible

officer signs this letter.



I.        Kenneth F. Rosanski, Senior Vice President MGP Instruments

          Inc.,  5000 Highlands Parkway, Suite 150 Smyrna Georgia, 30082

          is the responsible officer notifying the Nuclear Regulatory

          Commission under the provision of 10 CFR Part 21.



II.       The basic component involved in this condition are the Local

          Processing Units (LPUs) bearing the MGP Instruments Inc. part

          numbers RMS-9040-SR, RMS-9041-SR, RMS-9042-SR and RMS-9086-SR.



III.      The local Processing Units indicated in (II) above have been

          manufactured by MGP Instruments Inc., Smyrna Georgia.  The

          units were qualified for safety related applications.



IV.       The Southern California Edison Procurement Specification SO123-

          060-12 (rev. 2 January 16 1995) requires that the processors

          "Sense the loss of power and conduct an orderly shutdown..."

          and "Upon restoration of power, restart immediately and

          automatically and function in accordance with the requirements

          of [the specification]." Specification references 1.11.3.8.3.1

          &2 Page A-56).  Failure of the diode VD-9, located on the local

          processing units power supply board, will result in the

          processor's battery back-up battery not being charged,

          preventing orderly processor shutdown and re-start with correct

          operating parameters.



V.        The possibility of the diode failure was identified as

          potentially reportable under the provisions of 10 CFR 21 on 12

          June 1997.  A technical review, completed on 5 August 1997 and

          confirmed that there was a potential for safety impact.



VI.       Southern California Edison, San Onofre Nuclear Generation

          Station has 28 safety related local processing units.  At this

          time none of the units have been found to have the failure mode

          described in (IV) above.  Additionally, MGP instruments Inc.

          has been advised that the safety related processors are not

          presently in service.  Safety related processing units affected

          include those listed in attachment A of this notification.



VII.      MGP Instruments Inc.  will take the following corrective

          action: The diode VD-9 on LPU power supply boards (part numbers

          RMS-9077-SR and RMS-9068-SR) will be replaced with a diode

          (model 1N4004) which will withstand the non-repetitive peak

          forward current which could occur during startup.



VIII.     MGP Instruments Inc.  recommends that Southern California

          Edison not put the affected units in service until the power

          supply boards are reworked, by MGP Instruments.



Nuclear Regulatory Commission                                     Page: 3



Additional information about this issue may be obtained by contacting the

undersigned or Mr. David Jarrow MGP Instruments Inc.  Quality Assurance

Manager at (770) 432-2744, extension 119.



Sincerely Yours:



Kenneth F. Rosanski

Senior Vice President



KFR/dj



Attachments:



Attachment A: Equipment Serial Number and Location Listing

Attachment B: e-mail from Southern California Edison Dated 4 August 1997



cc:  Southern California Edison - Mr. Ken Slagle, Manager Nuclear

     Oversight Division.

     Southern California Edison - Mr. Ray Baker, Project Manager, RMS



     MGP Instruments SA, Lamanon France:     X. Duquesne, F. Chlosta, B.

                                                Morel,

                                             C. Picard,

                                             A. Pommier, P. Stolpe



     MGP Instruments Inc. Atlanta: Mr. David Jarrow, Mr. Mike Edelmen,

     Mr. Sergio Lopez



Nuclear Regulatory Commission                                      Page:4



                              Attachment A



SCE San Onofre Safety Related LPU Serial Number Listing



P.O.      Unit Type           P/N       Quan.     S/N       SCE Location

6V2D3002  LPU/PIPS/NG    RMS-9040-SR     4        960203     3re7822

                                                  960205     2rc7822

                                                  960206     2re7823

                                                  960208     3re7823



          LPU/PIPS/P     RMS-9041-SR     4        960203     3re7804

                                                  960204     3re7807

                                                  960205     2re7804

                                                  960207     2re7807



          LPU/SAS        RMS-9042-SR      6       960102     3re7808

                                                  960206     2/3re7825

                                                  960208     3re7804

                                                  960217     2re7804

                                                  960218     2/3re7824

                                                  960220     2re7807



          LPU/IO         RMS-9086-SR      8       960101    2ryj7865

                                                  960202    3ryj7870

                                                  960204    2rjy7874

                                                  960205    3rjy7874

                                                  960206    3rjy7865

                                                  960207    3rjy7820

                                                  960208    2rjy7870

                                                  960209    2rjy7820



6E256015  LPU/PIPS/NG    RMS-9040-SR      2       960202    SCE Warehouse

(Spares)                                          960204    SCE Warehouse



          LPU/PIPS/P     RMS-9041-SR      2       960202    SCE Warehouse

                                                  960206    SCE Warehouse



          LPU/SAS        RMS-9042-SR      2       960205    SCE Warehouse

                                                  960210    SCE Warehouse



Mike  Edelman



From: RAY BAKER 

To: NUC.CURRANJM at WEST7 @ccgateout.songs.sce.com:

NUC.PHILLICA at WEST7 @ccegateout.songs.sce.com

Cc: medelman @mgpi.com

Subject LETTER TO MGPI ON RMS EQUIPMENT STATUS

Date: Monday, August 04, 1997 12:44 PM



Carolyn==Please type this letter on Edison International

letter head.  You also need to finish the salutation stuff by adding

Jariath's name, return address etc.

                    tks,

                         ray b. 8/4



          August 4, 1997



Dr.  Mike Edelman

MGP Instruments

Suite 150

5000 Highlands Parkway

Smyrna, GA 30082



Subject: Status of RMS Equipment



Dear Mike Edelman,



This letter confirms a telephone conversation you had recently with Ray

Baker, RMS Project Coordinator regarding the status of the RMS Equipment.

None of this equipment has been made operational as of this date.



               J. M. CURRAN

               RMS Project Manager



                                 Page 1



GENERAL INFORMATION or OTHER                      EVENT NUMBER: 32725



LICENSEE: MGP INSTRUMENTS, INC.              NOTIFICATION DATE: 08/05/97

    CITY: SMYRNA                   REGION: 2 NOTIFICATION TIME: 14:57

                                             (ET]

  COUNTY: FULTON                   STATE: GA EVENT DATE: 06/12/97

LICENSE#:                     AGREEMENT: Y   EVENT TIME: 00:00 [EDT]

DOCKET:                                      LAST UPDATE DATE: 08/05/97



                                                  NOTIFICATIONS



                                             PHIL HARRELL, REG 4 RDO

                                             JOHN GREEVES, NMSS  EO

NRC NOTIFIED BY: KENNETH ROSANSKI            KEVIN RAMSEY, NMSS  IMOB

HQ QPS OFFICER: LEIGH TROCINE                VERN HODGE, NRR     RVIB

                                             CHRIS CHRISTENSEN   R2DO

EMERGENCY CLASS: NOT APPLICABLE              AL CHAFFEE, NRR     EO

10 CFR SECTION:

CDEG 21.21(c)(3)(i)           DEFECTS/NONCOMPLIANCE



                               EVENT TEXT



10 CFR PART 21 NOTIFICATION REGARDING THE DISCOVERY THAT A RADIATION

MONITORING SYSTEM POWER SUPPLY CIRCUIT BOARD IS SUBJECT TO

PREMATURE

ELECTRONIC COMPONENT FAILURE



MGP INSTRUMENTS, INC., LOCATED IN SMYRNA, GEORGIA, REPORTED A

POTENTIAL

SAFETY-RELATED DEFECT INVOLVING DIODES IN RADIATION DETECTION

MEASUREMENT

EQUIPMENT WHICH WAS SUPPLIED TO SOUTHERN CALIFORNIA EDISON FOR USE

AT SAN

ONOFRE. DIODE VD-9 (MODEL #1N4148) WAS INSTALLED ON PROPRIETARY

POWER

SUPPLY BOARDS, AND THIS DIODE IS SUSCEPTIBLE TO FAILURE DURING

EQUIPMENT

START-UP.  THE FAILURE IS DUE TO THE INSUFFICIENT RATING OF THE DIODE

UNDER TRANSIENT CONDITIONS (NON-REPETITIVE PEAK FORWARD CURRENT).

FAILURE OF THIS DIODE COULD ULTIMATELY RESULT IN THE INABILITY OF THE

LOCAL PROCESSING UNIT TO RESTART WITH CORRECT OPERATING

PARAMETERS.



THE SAFETY-RELATED APPLICATION OF THIS DEVICE IS LIMITED TO ITS

INSTALLATION IN 28 LOCAL PROCESSING UNITS AT SAN ONOFRE.  MGP

INSTRUMENTS, INC., STATED THAT A RECENT INQUIRY OF THE UTILITY

INDICATED

THAT THE AFFECTED EQUIPMENT HAD NOT BEEN COMMISSIONED AND IS NOT

YET IN

SERVICE.  PLANS ARE BEING MADE TO REPLACE THE DIODES WITH

APPROPRIATE

COMPONENTS PRIOR TO THE COMMISSIONING OF THE EQUIPMENT.



(REFER TO THE HOO LOG FOR CONTACT NAMES AND TELEPHONE NUMBERS.)



MGP                                Fax

INSTRUMENTS

5000 Highlands Parkway, Suite 150                 Tel: (770) 432-2744

Smyrna, Georgia 30082 USA                         Fax: (770) 432-3179



Date:  5 August 1997                         Pages (including cover): 6



To:    Ms. Leigh Trocine -NRC Operations     From: David Jarrow MGPI QA

        Officer



cc:    Mr. Ken Rosanski - MGP Instruments Inc.



Phone: 301-816-5100



Fax:   301-816-5151



Subject:  10 CFR 21 Notification, Event 32725 @ 14:57 PM 5 August 1997,

          MGP Instruments Inc Radiation Monitoring System, power supply

          circuit board is subject to premature electronic component

          failure.



Ms. Trocine,



Further to our earlier telephone notification (this date), attached

please find a copy of our notification letter the original of which is

being sent by courier.



This faxacsimile notification is being provided in accordance with the

requirements of 10 CFR 21.21.



Should you have any questions please do not hesitate to contact me at

770-432-2744 X 119



David Jarrow



MGP Instruments Inc.

Quality Assurance Manager



*** END OF DOCUMENT ***



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