ML20126E828

AO 50-219/75-31:on 751124,during Operability Test of Torus to Drywell Vacuum Breakers,Alarm Sys 2 Failed to Annunciate in Control Room When V-26-4 Opened.Caused by Failure of Relay Due to Contacts Being Detective.Relay Replaced

ML20126E828
Person / Time
Site:	Oyster Creek
Issue date:	12/03/1975
From:	JERSEY CENTRAL POWER & LIGHT CO.
To:
References
AO-50-219-75-31, NUDOCS 8103020660
Download: ML20126E828 (3)

Text

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LICENSEE EVENT REPORi - - --

CONinOt 8tOCx:[ l l l l l l ,

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AME LCENSE NUMBER YE TYPE 01 l Nl Jl 0l Cl Pl1 l 7 89 14 l

15 l l-l l l l l l-l l 25 l l4l1 26 l1l1l0l 30 l0 l1l 31 32 CATECORY TN Eu!iC1. DOCKET NUMBER EVENT DATE REPORT DATE D 1 CON'T l M l I l Qj lLl l 0 l 5 l0 l-l 0 l2 l 1l 9l l1lIl2l4l7lSl l1 l 2l0 l 3 l 7 l 5 l 7 8 57 58 59 60 61 68 69 74 75 EO >

EVENT DESCRIPTION BE I During a routine operability test of the torus to drywell vacuum breakers, alarm l {

7 89 80 SE l system II failed to annunciate'in the Control Room when V-26-4 was opet.ed. This l 7 89 80

@l had minimal safety sinnificance since alarm system I was available and operable. l 7 89 80 EE l The time delay drop out relav was replaced. An investigation will be conducted l 7 89 80

$l to determine if the relay should be replaced with another type. (A0 No. 50-219/75- 31b 7 89 pgug 60 SYSTEM CAUSE COMPONENT COMPONENT CODE CODE COMPONENT CODE SUPPLER MANUFACTURER VOLATON RE l zl zl lEl l R l E l Ll Al Yl l lNl l Al 1l 0l 9l lNJ 7 89 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION

@l An Agastat Relay Company Model'7022AC relay failed to operate alarm system II l '

7 89 80 32 l because the contacts were defective. The relay was replaced. l 7 89 80 1

l l ,

FACUTy METHOO OF STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTON 1

7 8 9 (Ej l0l7l4l12 13l NA l @ l NA l 10 44 45 48 80 RELE EO OF AMOUNT OF ACTrvriv LOCATON OF RELEASE E lzJ L1]EL ASE l NA l l NA l 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBEA TYPE l

DESCRIPTON DE l01010 l 7 89 11 Ltl 12 I

13 NA 80 I

l PERSONNEL INJURIES NUMBE R DESCAPTON i 35 l0 l0 l 0 l l NA l 7 89 11 12 80 j OFFSITE CONSEQUENCES  !

NA 39 l l 7 89 80 LOSS OR OAM AGE TO FACILITY TYPE DE scrip 7ON i

1' D] d 7 89 l

10 NA 80 l

PUBLICITY M l NA l 7 89 80 ,

ADDITIONAL FACTORS --

D@ l NA l ,

7 89 80 1 l l 7 89 80 (201) 539-6111  !

A E: PHONEL FYt- Pln-n

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_Date of.

Report Date: Nove=ber 2's . 1975 Occurrence: Nove-ber 24 1975 _

i Initial Written Time of  : i Report Date: Nove=ber 25, 1975 occurrence: 1515 l

CYSTER CREEK NDCLEAR GENERATI.% STATION FORKED RIVER, NEW JERSEY 08731 Abnormal Occurrence .

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feport No. 50-219/75/ ).1 , ,

Failure of torus to drywell vacuum breaker alarm system I IFICATIM II to annunciate when vacuu: breaker V-26 8 was opened for i

i OF OCCURRENCE:

an operabil,ity test.

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This event is considered to be an abnormal occurrence as de- '

fined in the Technical Specifications, paragraph 1 15 D .

CDKDITIONS PRIOR ,

TO OCC11RRENCE: X Steady State Power Routine Shutdown i Hot Standby . Operation _ l Cold Shutdown Load Qianges During ,

Refueling Shutdown Routine Power Operation i Routine Startup Other (Specify)  !

Operation j i

Power: Core 1428 M'*t i Electric 470 .Wg G*v i

Recire. 1137g10 Flow:

Feed L.67x1C 1.Bhir  ;

Reactor Pressure: 1020 PSIG l Stack Gas: 9230 u ci/Sec  !

i DESCRIPTIW DF OCCURRE.NCE: At approximately 1515 on Nove=ber 24, 1975 during a reutine l operacility test of the torus to drywell vacuum treakers, alar syste: II l failed to annunciate in the Centrol Room when Y-26-4 was opened. On,sub- '

s e que r.: operations of V-26 t systen II continued to fail. Checks by r.ain- i tenance personnel identified the contacts in the time delay drop out relay  ;

ae the source of the failure. j t

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• rmaj Occurrence Page 2

.rt. Ho. 50-219/75/ 31 6RDTT CAUSE __

Design Procedure

.CCUMEhu: hufacture Unusual Service Cno63r3cn Installation / IX Inc. Emrironmental Construction Compenent Failure Operator other (Specify) i

.iS3S OF IARD;CE: The safety 31mificance of this event is considered to be mir.i 1.1.

• e function 'of the torus to drywell vacuum breaker alarm rystet2s is tt

• sure vacuwu breaker avsil.'at111ty in the event of an accident condit 1 cts.

e failure of alarm syste II to be operable for V-26 h resulted only in e loss of redundancy fc2- the alarn function. Had V-26 14 been o;:en durt .s

wer operation alarm syste= ! vould have performed the alar = function.

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ETIVE trJ: Corrective action La presently under investigation. ,

URE MYA: Agastat Relay Time Delay on drop out Medel #7022AC Eerial'fM0352663 Coil 120 V 60 Er Ti=e 1 5 - 15 seconds .

r. red by:

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J ar.e s E. Icel.ca us e r

[' n 2 _w Date: November 25, 1975

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