ML14112A258

Ro:Micro Switch Series 2 Mfg by Honeywell Caused Grounding of Circuits When Replacing Burned Out Indicating Lights. Personnel Instructed Re Procedural Steps Which Should Be Performed Prior to Lamp Replacement

ML14112A258
Person / Time
Site:	San Onofre
Issue date:	09/18/1980
From:	Curran J SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
NUDOCS 8010060348
Download: ML14112A258 (2)

Text

RE.ATORY INFORMATION DISTRI 10N SYSTEM (RIDS)

ACCESSION NBR:8010060348 DOC.DATE: 80/09/18 NOTARIZED: NO DOCKET' #

FACIL:50-206 San Onodtre Nuclear Station, Unit 1, Southern Californ 05000206' AUTH.NAME AUTHOR AFFILIATION CURRANJ.M.

Southern Cralifornia Edison Co.

RECIPNAME.

RECIPIENT AFFILIATION ENGELKEN,RH.

Region 5', San Francisco, Office of the Director

SUBJECT:

RO:Micro,Switch Series 2 mfg by Honeywell caused grounding of-circuits when replacing burned out ihdicating lights.

Personneh instructed re procedural steps which should be performed prior to lamp replacement.

DISTRIBUTION CODE: A002S COPIES RECEIVED:LTR 'iENCLU.1 SIZE:

TITLE: Incident Reports NOTES:1 copy:SEPSect. Ldr.,

05000206 RECIPIENT COPIES RECIPIENT, COPIES ID CODE/NAMEi LITTR ENCL ID CODE/NAME1 LTTR ENCL' ACTION:

CRUTCHFIELD 04 3

INTERNAU: A/D COMP&STRU06 1'

A/D' ENV TECH 07 1

A/D MATL & QU08 1

A/D OP REACT009 I

A/D PLANT SYS10 11 A/D RAD PROT 11 1

A/D SFTY ASSE12 I

A/D TECHNOLOG13 1

ACC EVAL BR 14 1

AEOD

2.

ASLBP/J.HARD 1

AUX SYS BR 15 1

CHEM ENG BR 16 1

CONT SYS BR 177 1

CORE" PERF BR 18 1'

D/DIRHUM FAC19 1

DIR,ENGINEERI2O 1

DIRHUM FACiS21 1

DIR,?SYS INTEG22 1

EFFE TR SYS BR23 1

EQUIPQUAL BR25 1

GEOSCIENCES' 26 1

I&C SYS BR 29 1

I&Ei 05 2

JORDANE;./IE!

I LICiGUID BR 30 1

LIC QUAL BR 31 1

MATL ENG' BR 32 1

MECH ENG BR 33 1

MPA.

3 NRC'PDR 02 1

OP EX EVAL BR34 3

OR ASSESS BR 35 1

POWER SYS BR 36 1

S BR39 REACT SYSIBR 40 1

FIL 01 1'

1 REL: & RISK A 41 1

G EVA42 I

I STRUCT ENG BR44 1

SYS INTERACiB45 1

1 EXTERNAL:

ACRS 46 16 16 LPDR 03 1

NSIC' 05 1

1 TERAiDOUG MAY 1

TOTAL NUMBER OF COPIES REQUIRED: LTTR ENCL L

Southern California Edison Company P.0 BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD, CALIFORNIA 91770 September 18, 1980 U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1990 North California Boulevard Suite 202, Walnut Creek Plaza Walnut Creek, California 94596 Attention:

Mr. R. H. Engelken, Director Docket No. 50-206 San Onofre -

Unit 1

Dear Sir:

This letter describes a reportable occurrence, as defined in Section 6.9.2.a(9) of Appendix A to the Provisional Operating Licence DPR-13.

After the installation of the new Containment Isolation Panels (13A and 13B) a problem was identified which potentially could cause the grounding of circuits when replacing burned out indicating lights. Since it is station practice to replace indicating lights with the power supply energized, the potential exists for operating certain containment isolation valves during the lamp replacement.

The switch type in question is Micro Switch Series 2 which is manufactured by Honeywell. Discussions with the vendor have been initiated to correct this deficiency. Station personnel have been instructed by station memorandum regarding those required procedural steps that must be performed prior to lamp replacement.

A complete report on this matter together with a License Event Report will be forwarded within two weeks.

Sincerely yours, J. M. Curran Plant Manager

'801 00,60