ML20217H051

Part 21 Rept Re Discovery That Radiation Monitoring Sys Power Supply Circuit Board Subject to Premature Electronic Component Failure

ML20217H051
Person / Time
Site:	San Onofre
Issue date:	08/05/1997
From:	Rosanski K AFFILIATION NOT ASSIGNED
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-PT21-97 NUDOCS 9708080191
Download: ML20217H051 (7)

Text

04(0s/97 TUE 15:31 FAI 7704329t79 MGP Instrum:nts (d002 y

'MGP INSTRUMENTS Ssite 150 50oo Highlands Parkway

. 'Smyrna. O A 30002 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 oflocal 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

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

During field maintenance oflocal 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 band 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 desigr, which contain the power supply circuit board, with the suspect h'p ,

component, were qualified for use in a safety related application and delivred to Southem Califomia Edison for use at their San Onofre Nuclear Generation Station.

M-MGP Instruments Inc. has completed a technical review and concluded that the diode VD9 (mo IN4148), installed on the MGPI proprietary power supply boards (part nos. RMS-9077-SR and RMS

-i 9068 SR), is susceptible to failure during equipment start up. This failure is rk:c to the insufficient g~,

g rating of the diode under transiera conditions (non-repetitive peak forward current), gig, So li!!E.

gg Failure of diode VD 9 will result in a loss current passing through the coil of electronic relay Kl. g!!!!.

gg FcF ',g diode failure, the relay will not be energized, and the battery required for the processor's ~~

memoc ' cck up will not be charged. Accordingly, following eventual battery discharge, the LPU may Q

00 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 Southem

$e Califomia Edison's San Onnb Nuclear Generating Station (serial number listing indicated in

( S@co attachm nt A). A recent inquiry to the utility indicated that the affected equipment bas 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.

08/05/97 Tt'E 15:32 FAX 7704329179 McP instru n nts @ 003 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 MOP 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 Instmments Inc., Smyma Georgia. The units were qualified for safety related applications.

IV. The Southern California Edison Procurement Specification Sol 23 06012 (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 1.11.3.8.3.102 Page A-56). Failure of the diode VD 9, located on the local processing units power stipply 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 revb.w, completed on 5 August 1997 and confinned that there was a potential for safety impact.

VI. Southem Califomia 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 VD9 on LPU power supply boards (part numbers RMS 9077-SR and RMS-9068-SR) will be replaced with a diode (model IN4004) which will withstand the non-repetitive peak forward current which could occur during startup .

VIII. MGP I,strumentilnc. recommends that Southern Califomia Edison not put the affected units in service until the power supply boards are reworked, by MGP Instruments.

08/05/97 TUE 15:33 FAI 7704329179 MCP lustrurents l$004 Nuctsar 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 Ycars:

1~ AM Kenheth Flitofanski Senior Vice hesident KFR/dj l Attachments:

Attachment A: Equipment Serial Number and Location Listing Attachment B: e-mail from Southern Califomia Edison Dated 4 August 1997 cc: Southem Califomia Edison - Mr. Ken Slagte, Manager Nuclear Oversight Division.

Southem Califomia Edison Mr. Ray Ba a r, 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

/

08/,05/97 TL'E 15533 FAX i704329179 NCP instruments coos 4

Nuclear Regul: tory Commission Page: 4 Attachment A SCE.Sa'a Opp #BiSafetyReistediLMJ!SeriMNiihiMnit(ft%  : :,yWE!!'I, .

P.O. Unit Type P/N Quan. S/N SCE Location 6V2D3002 LPU/ PIPS /NO RMS 9040-SR 4 960203 3re7822 960205 2re7822 960206 2re7823 960208 3rc7823 i

LPU/ PIPS /P RMS 9041-SR 4 960203 3re7804 960204 3re7807 960205 2re7804 960207 2rc7807 LPU/SAS RMS 9042 SR 6 960102 3re7308 960206 2/3re7825 960208 3re7804 960217 2re7804 960218 2/3re7824 960220 2re7807 l LPU/IO RMS-9086 SR 8 960101 2ryj7865 960202 3rjy7870 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 I

i

067,05/97 TUS 1$i33 5'Ab7704329179 NGP lt 6 t ruieral6 glous httACb/rfct)7 0~

Mike Edelman . _.._ . . . . . _ .

From: RAY BAKER < bake .sce.com>

To: NUC.CURRANJM at steout. songs.sce.com:

NUC.PHILLICA aLWEST7@cega . songs.sce com Cc modelman .com Subject LETT MGPl ON RMS EQUIPMENT STATUS -

Date: Monday, August 04,199712:44 PM Carolyn ==Please type this letter on Edison international letter head. You afso need to finish the salutation stuff by adding Jarlath's name, retum address etc.

tks, ray b. 8/4 l

l l 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 telephorie 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 4

4 Pagei r .

DC D OWF7 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 LICENSEN: 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 OPS OFFICER: LEIGH TROCINE VERN HODGE, NRR RVIB CHRIS CHRISTENSEN R2DO EMERGENCY CLASS: NOT APPLICABLE AL CHAFFEE, NRR EO 10 CFR SECTION:

l l

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 VD9 (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.)

08/D5/97 TUE 15:31 FAX 7704339179 MGP instruments 4 001

• \

YN j&"

w' MGP t mmmm fax

$000 Hightends Penway, Sume 160 Tot; U70) 432 2744 Smyrna.Qeorgto 30062 USA Fam: U70) 412 9179 Date: 5 August 1997 Pages (including cover): 6 To: Ms. Leigh Trocine NRC Operations Officer From: David Jarrow MGPlQA 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 $ 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 l 21.21.

Should you have any questions please do not hesitate to contact me at 770 432 2744 X 119 David Jarro ents Inc.

Quality Asssurance Manager

. ___ _ _ _