05000244/LER-2076-006, Malfunction of Undervoltage Relay During Surveillance Test on 2/6/1976

Malfunction of Undervoltage Relay During Surveillance Test on 2/6/1976

ML18143A497
Person / Time
Site:	Ginna
Issue date:	02/19/1976
From:	White L Rochester Gas & Electric Corp
To:	O'Reilly J NRC/IE, NRC Region 1
References
LER 1976-006-00
Download: ML18143A497 (6)

LER-2076-006, Malfunction of Undervoltage Relay During Surveillance Test on 2/6/1976

Event date:
Report date:
2442076006R00 - NRC Website

text

TDOCKET NUMBER 50-244 v.s. NUCLEAR nI:-ovLATonvcoMv!ssio I NRC Fonw 196

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p I'ILE NvMDER XNCXDENT REPORT NRC DISTR IDUTION I!on PART 60 l)OC I<ET I'stIAl'ERIAL ETTER Dn IGINAL Qcor v QNOTORIZED VNCI.ASS IF I E D MR J P O'Reilly DATE RECEIVED 2-24'-76 NUMBER Ol. COPIES RECEIVED L D WHITE, JR INPUT F pnop.

30 "RO ~: ROCHESTER GAS 6 ELECTRIC CORP ROCHESTER, NY 2-19-76

DESCRIPTION

LTR TRANS THE FOLLOWING...

~.......

ENCLOSV RE LICENSEE.'EVENT REPORT 50'-244/76-OA (30-DAY)

ON 2-6-76 RE MALFUNCTION OF UNDERVOLTAGE RELAY DURING SURVEILLANCE TEST...

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ROCHESTER GAS AND ELECTRIC CORPORATION o

89 EAST AVENUE, ROCHESTEI', N.Y. 14649 LEON D. WHITE, JA.

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• scA coos res 546 2700 February'19, 1976 r"I ggg

'" ',) ~ "(B t'lie Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406

Subject:

Reportable Occurrence 76-06 (30-day report), Malfunction of Undervoltage Relay during surveillance test R. E. Ginna Nuclear Power Plant, Unit No.

1 Docket No. 50-244

Dear Mr. O'Reilly:

In accordance with Technical Specifications, Article 6.9.2b, the attached report of Reportable Occurrence 76-06, 30-day, is hereby submitted.

Two additional copies of this letter and the attachment are enclosed.

Very truly yours, L. D.

ate,, Jr.

Attachment cc:

Mr. John G. Davis (30)

Mr. William G. McDonald (3)

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CONTROL BLOCK:

'CENSEE EVENT REPORT (PLEA'LT 1 PRINT ALLREQUIRED INFORMATION)

LICENSEE NAME

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1 14 15 7

89 LICFNSE EVENT LICENSE NUMBER TYPE TYPE 0

0 0 0

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0 0 0

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~0032 25 26 30 31 32 REPORT REPORT CATEGORY TYPE SOURCE DOCKET NUMBER EVENT DATE REPORT DATE [oai]coM'r~

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0 6

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EVENT DESCRIPTION

During surveillance testing of undervoltage relays, undervoltage device 274/11B failed 7

8 9

~

80 I

to drop to de-energized position after undervoltage signal was simulated.

Redundant 7

89 80

~04 relay 273/11B operated properly.

Three previous occurrences of this type were reporte 7

8 9I on 6/8/73, 12/13/74 and 8/5/75.

All 4 u.v. relays were field stipped to clean 80 7

8 9 80 ppg plungers and retested satisfactorily.

(Reportable Occurrence 50-244/76-06, 30-day) 7 8 9 PRIE SYSTEM

CAUSE

COMPONENT CODE CODE COMPONENT CODE SUPPUER Ioo7I ~IA E

R E

L A Y X

~N 7

8 9 10 11 12 17 43 CAUSE DESCRIPTION tops]

The u.v. relay plunger malfunction was due 80 COMPONENT MANUFACTURER W

1 2

0 N

44 47 48 to buildup of bushing deposits on plunger 7

8 9 80

~10 type relays 'for this application have been tested for (cont'd. under Additional Factors) 80 7

89 FACILVii'TATUS

% POWER Q~g N

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NA 7

8 9

10 12 13 FORM OF ACTIVITY COATENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY 1 2 8

K NA 7

8 9

10 11 PERSONNEL EXPOSURES NUMBER TYPE

DESCRIPTION

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E NA 7

89 11 12 13 PERS'ONNEL INJURIES NUMBER

DESCRIPTION

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NA 7 '89 11 12 METHOD OF DISCOVERY DISCOVERY DESCRIPTION OTHER STATUS b

NA 5

46 80 LOCATION OF RELEASE 44 45 80 80 80 OFFSITE CONSEQUENCES NA

.7 89 80

~09 shaft.

The device is a Westinghouse type SV 75-150V ac undervoltage relay.

New 7

8 9 LOSS OR DAMAGE TO FACILITY TYPE

DESCRIPTION

s 7

89 10 PUBLICITY 80 80 7

89 80

, ADDITIONAL FACTORS Q~g (cont'd. from Cause Description) reliability and duly approved for installation during 7

89

~19 the present refueling outage.

7 89 Dennis Gent NAME 80 80 PHONE.716/546-2700, ext. 291-216 Gf'0 082

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