ML20107C529
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To:
Ja acs P. O'Poilly h's.f Directorate of P.eg'.itatory Operations 4
Region I
- pp 631 Park Avenue King of Prussia, Pennsylvania 19406 4
From:
Jersey Central Power 6 Light Co::.pany Oy"cr Crech.';uclear Generating Station Docket #50-219 Fora.ed River, New Jersey 08731 Subjcet:
Abnormal Occurrence Report No. 50-217/74/
17
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The 1ollowing is a preliminaly report being submitted in compliance with the Technical Specifications paragraph'6.6.2.
Preliminary Approval:
Q.
l' /. 1 0 1-3/t/74
[ 'T.
Carroll, Jr.
Datc cc: !!r. A. Giaubusso s
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MoV 2125
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DEKOK95-258 PDR
iiiitial Telephone Date of.
16; port Date:.
3/n/7f)
Occurrence:
7 3/7/ 74 Initlal :','rltt' n Time of e
Report Date:
3/8/74 Occurrerice:
1700
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OYSTER CPIEK NUCLEAR GENRILVrING STATION
' ' FORKED RIVER, N&.' JERSEY 08731 Abnormal Occurrenco Report No. 50-219/74/ 17 IDIINTIFICNTION Violation of the Technical Specifications, paragraph 3. 7. 8, OF.0CCURICNCE:
when power cperation of the reactor continued with the SD transforr.cr uaavailabic for service for a tire period greater than the Technical Specification limit of 7 days out of any 30 day period.
This event is considered to be an abnormal occurrence as de-fined in the Technical Specifications, paragraph 1.isn CONDITIONS PRIOR TO OCCURFLNCE:
Steady State Power X
Reutino Shu.down llot Standby Operation Cold Shutdown Load Changes During Refueling Shutdown Routine Power Operation Routino Startup.
Other (Specify)
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Operation
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Power:
Elec., E100 We Reactor, =300 1T.-lt Flow:
Recire.,
7.5 x 10" gpm Feed., 1.2 x 10' lb/hr Stack Gas:
=10,000 pCi/sec 4
l DESCRIPTION On nursday, llarch 7,1974, at 1700, as part of the routine OF OCCURRENCE:
plant shutdown procedure, it was required to transfer plant power from the IB auxiliary transformer to the SB startup transformer. He control room operator on duty operated the closing switcli for the S1B breaker with no results.
The reactor shutdown was terminated, holding the generator cicctric I
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i power at al proximately 100 We in order to maintain a power supply path thr6 ugh the l'B auxiliary transform'er.
Inspection
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-n '.LAbno wal'Occurrenco-
- Report !!o'. 219/74/17 Pago 2 J
6f the SIB breaker revealed that.the closing spring was not in i
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- the wound.giosition; hence, breaker closure was not possible in either the manual or automatic code, ne failure ofithe spring to wind has been traced to a failed spring cam switch which closes uhon the spring unuinds. 1he cam switch closure normally causcs a relay, 52Y, to ' energize which in turn doenergizes the SIB breaker closing coil 52X, -contacts from 52X in turn cause
- the spring winding motor to start and rewind the_ spring.
Since-the cam switch' contacts failed to cause 52Y to energize, a con-tinuous current was applied to 52X causing it to burn which l
resulted ~in freezing the coil auxiliary contacts in their energized position.
It 1s-thought at this tire that the failure
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of the sprini; to rcuind occurred during the January. 12, 1974
- reactor shutdown operation, since this was 'the last successful operation of the breaker. After replacing the 52X coil and I
the failed contact in the cam switch, successful transfer of load from IB auxilialy transformer to the SB startup transformer was achieved.
4 APP'ARENT CAUSE Design Procedure 0F OCCURRENCE:
hhtnufacturc Unusual Service Condition Installation /
Inc. Environmental
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Construction Component Failurc Operator Other (Specify)
J' he failure of the cam swit'ch contacts is presently under 1'
investigation.
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' Abndmal Occurrer.cc
' Re}; ort No. 50-219/74/17 Page 3 o
ANALYSIS OF' The SIB brcoker is intended to close. aatomatically wh'en the-OCCURiti!NCE:
IB auxiliary transformr breaker trips. -!!ad the breaker been i
required to perform this function, it would have resulted in a loss of power to the ID and ID 4160 volt switchgoar. :The 1-2 Emergency Diosc1 Cenerator would have initiated in the
' fast start mode and assumed load on the 16 emergency bus.
CORRECTIVi!
The corrective action will be determined after PORC evaluation ACTION:
of the incident.
FAILUiw DATA:
Manufacturer data portinent to the failed switch:
General Electric Company Switch Part #456-A8668-5 4160V Switchgcar 2
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9 4
R 6
9 4
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_ ! /3t4 Prepared'by:
/4 ev>
Date:
3/S/74 g
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