ML18038A897

Part 21 Rept Re Defect in Latching Mechanism of Potter & Brumfield Relay on C&D High Voltage Shut Down Alarm Assembly Printed Circuit Boards.Pull Test on Relay Reset Button Incorporated Into Receiving Insp Procedures

ML18038A897
Person / Time
Site:	Hatch, Browns Ferry, Salem, Grand Gulf, Cooper, Limerick, Vermont Yankee, Vogtle, Farley, San Onofre
Issue date:	09/07/1994
From:	Kinden T C&D CHARTER POWER SYSTEMS, INC. (FORMERLY C&D POWER
To:	NRC
Shared Package
ML18038A898	List: ML18038A897 ML18039A937
References
REF-PT21-94 NUDOCS 9409150071
Download: ML18038A897 (10)

Text

REGULATORY .INFORMATION DISTRIBUTION SYSTEM DOC.DATE: 94/09/07 (RIDS)'CCESSION NBR:9409150071 NOTARIZED: NO DOCKET FACIL 50-206 San Onofre Nuclear Station, Unit 1,. Southern Californ 05000206 50-321 Edwin Edwin I.

I. Hatch Nuclear Plant, Unit 1, Georgia Power C Hatch Nuclear Plant, Unit 2, Georgia Power C 05000366 05000321'0-366 50-424 Alvin W. Vogtle Nuclear Plant, Unit 1, Georgia Power 05000424 50-425 Alvin 'W. Vogtle Nuclear Plant, Unit 2, Georgia Power 05000425 50-348 Joseph M. Farley Nuclear Plant, Unit '1, Southern, Nucl 05000348 50-364 Joseph M. Farley Nuclear Plant, Unit 2, Southern Nucl 05000364 50-416 Grand Gul'f Nuclear Station, Unit 1, Mississippi Power 05000416 50-259 Browns .Ferry Nuclear Power Station, Unit 1, 'Tennessee Browne Ferry Nuclear Power Station, Unit 2, Tennessee 05000260 05000259'0-260

/$ 50-296 Browns Ferry Nuclear-Power Station,,Unit 3, Tennessee ,,05000296 50-271 Vermont Yankee Nuclear Power Station, 'Vermont Yankee 05000271 50-352 Limerick. Generating Station, Unit 1, Philadelphia Ele 05000352 50-353 Limerick Generating. Station, Unit 2, Philadelphia Ele 05000353 50-298 Cooper Nuclear Station, Nebraska Public Power Distric 05000298 50-'361 San Onofre Nuclear Station, Unit 2, Southern Californ 05000361 50-362 San Onofre Nuclear Station, Unit 3, Southern Californ 05000362.

50-272 Salem Nuclear Generating Station, Unit 1,Public Servi 05000272 50-311 Salem Nuclear Generating Station, Unit 2, Public Serv 05000311 AUTH. NAME, AUTHOR AFFILIATION KINDEN,T.J. C&D Charter Power Systems,, Inc. (formerly C&D Power Systems RECIP.NAME RECIPIENT AFFILIATION NRC No Detailed Affiliation Given

SUBJECT:

Part 21 rept re defect in latching mechanism of Potter &

Brumfield relay on C&D high voltage shut down alarm assembly printed circuit boards. Pull test on relay reset button incorporated into receiving insp procedures.,

DISTRIBUTION CODE: IE19D TITLE: Part '21 Rept (50 DKT)

COPIES RECEIVED: LTR g ENCL i SIZE:

NOTES:License Exp date in accordance with 10CFR2,2.109 05000206 Application for permit renewel filed. 05000425 05000352 Application for permit renewal filed. 05000353 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID'ODE/NAME LTTR ENCL ONDD PD 1 1 PD2-3 PD 1 1 PD4-1 PD l,,l PD2-1 PD 1 1 1 1 PD2-4-PD 1 1 PD1-3 PD 1 1 PD1-2 PD 1 1 PD4-2 PD WEBB,M 1 1 JABBOUR,K 1 1 HOOD,D 1 1 SIEGEL,B 1 1 O'ONNOR,P. 1 1 WILLIAMS',J. 1 1 DORMAN,D 1 1 RINALDI,F 1 1 HALL,R 1 1 FIELDS,M. 1 1 STONE,J. 1 1 INTERNAL: AEOD 1 1 NRR/DRI L/RVIB 1 1 01 1 1 RES/DSIR/EIB 1 1 1 1 RGN2 1 1

'RGN3 1 1 RGN4 1 1 RGN5 1 1 ,SECY/PDR 1 1 EXTERNAL: INPO RECORD CTR 1 1 NOAC SILVER,E 1 1 NRC. PDR 1 1 i

t L

4> 41

NOTES: 1 1 TOTAL NUMBER'F COPIES REQUIRED: LTTR 33 ENCL 33.

41 SE;P 87 '94'lt21 C 8 D ITY-ASSURANCE 3398'. 1 l ~ 3043 Walton Rond I CD

/BARTER POWER SYSTEMS. ~pl(o~s Plymouth Meetlnj, PA 19462 gg( (7 Telephone (215) 828-9000 8~

FAX (215) 834-7305

.+Q: CPA

'I lilI ' l t-v-September 7, 1994

~ .~' /Q~ $ 4 NRC Opcrafions Center Fa~ 301<92<187 Dear Sirs; Based upon field complaints from Southern California Edison on non 1E safety related chargers, we

~ discovered a defect in the latching mechanism of Potter and Brutnfield R10-E3286-2 relays (C8Q) Part Number Jul'-E) which may efi'cct 1E safety r'chted chargers in the field. The relay is found on C897- '

High Voltage Shut Down Alarm Assembly Printed Circuit Boards (MBC-2920-E) used in CAD ARR Char gers.

~

The failure has been identified as a dimensional xon~nformance in the latching mech'anism of the relay.

The defect'is limited to two date code lots of ntatcrial igetttificd as lots 9108'and 9242 on the rehy. The lot code'is located on thc front of the relay. Failure of the rehy.may cause an apparent High Voltage Shut Down of. the Charger terminating charging of the battery.system until such time as the relay is reset, or it:

may result in a false ahrm without shutdown'of the charger: The battery itself willbe unaficcted unless thc shutdown condition is not corrected for a sufiicient period of time for the batteries to become discharged. For this reason wc do not believe that the failure mode. poses an imminent danger.

We have identified a time period during which these boards were available, but are not able to trace which boards these particular lots of relays wcremed'on.'Lot 9118:w'as manufactured by Potter 4 Brtnnfield on ~

February 22, 1991. Lot 9242 was manufactured by'Potter P. Srumficid on October.30, 1992. All chargers'hich use this rehy or rephtcetncnt boards that were sold Rom February 22, 1991 until the present have' been identified and the vendors are listed in, attachment A to this rcporL Each vendor willbe notified of '

possible hatard and the connection to the 10CHQl rcport of this event. They willbe advised to

.'he checlc'he HVSD Printed Circuit Board in their charger or'stock to assure that the rehy on the board is not &om one of the suspect lots. Any boards which contain rcl ays from the suspect lot may be returned to Cd& for testing and repair or replacement.

Means were identified to distinguish the 'good'chys from the 'bad'elays by means of a puB test on thc:,

reset button. This test has been incorporited into the receiving inspection procedures of both 'chy ourselves and our subcontractor for safety rehted boards. Using this test method, boards were selected for:

testing by Nuclear Logistics, Inc. under seismic stresses. Results of the testing is attached. These tests demonstrated that the 'pull test'as sufhcient to.distinguish 'good'oards Rom 'bad'or this defect

,mode and that the 'good'oards were able to withstand the seismic test without failure.

I '

WPC~CD+ l8 9409150071 940907 PDR ADOCK 05000206 B PDR

4l I

SEP 87 '94 11-22 C 8 D ITY-ASSURANCE 3398 'P. 2

Sincerely, T.J. Kinden

'Director Quality Assuraxxe C&D Chatter Power Systems, Inc..

aitachments List of eQected utilities NLIReport OXR023084-I; Approval Seismic Testing of a High Voltage Shutdown Iteiay Product Safety Committee, G.'alker, D. Muhlrad, J. Boston file: QA6692 file: Product Safety Conunittee.

41 1'

. SEP 87 '94 11:22 C 3 'D ITY-ASSURANCE 3398 P.3 4

4 List of Effected Utilities I ~

~ I JJtiLltt Nud r Plan 4 Southern Nuclear Service Co. Georgia Power Co. Vogtie Hatch Entergy Operations, Inc. Mississippi Power and Light Grand Gulf

'1 La Power and Light Waterford 3 ~

I Coausion Fedetal de Electncidad (satne) Laguna Verde Taiwan Power Co. -:(same) Chin'Shan Kuosheng Maanshan Tennessee Valley Authority (satne) Browns Ferry

(

'Vermont Yankee Nuc.. Power Corp. (same) Vermont Yankee PICO Energy, Inc. (same) Limerick

.NebrashtPublic'Power District (same) Cooper So..California Edison Co. (same) San Oaaf're I

Public Service Electric 8: Gas Co.

W Power Systems, Inc.

(same)'.

(unknown) . (unknown)

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