ML17338B268

LER 79-001/03L-0 on 790118:valve V-14-35 Failed to Open Completely During Routine Isolation Condenser Valve Operability Test.Caused by Dirty Torque Limit Switch Contacts,Which Were Subsequently Cleaned & Burnished

ML17338B268
Person / Time
Site:	Oyster Creek
Issue date:	02/15/1979
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML17338B267	List: ML17338B266 ML17338B268
References
LER-79-001-03L, LER-79-1-3L, NUDOCS 7902230119
Download: ML17338B268 (5)

Text

>NRC FORM 366

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LICENSE E EVENT REP ORT

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, CONTROL BLOCK: Q1 tPLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 7

~op1 1N 8 9 J 0 C P LICENSEE CODE I

1 14 Q 15 0 0 6

0 0 LICENSE NUMBER 0 0 0 0 25 Q3 26 4 1 1 LICENSE TYPE 1 1 30 04~

57 CAT 58 Qs CON'T

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74 Qs02 75 1

REPORT DATE Qs 7 8 60 61 DOCKET NUMBER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10 On January 18, 1979, while performing a routine isolation condenser

~O3 valve operabil ity test, T.S. 3.8.A was violated when valve V-14-35 fail-

~p4 ed to open completely. When the test initiating signal was applied, the

~os valve opened approximately 104 and then stopped. Valve V-14-35 is D.C.

~OB motor operated and is fitted with a double torque. limit switch which is

~O7 bypassed by a shorting switch during approximately the first IOC of

~o- s valve travel.

80 7 8 SYSTEM CAUSE CAUSE COMP. VALVE SUBCODE COMPONENT CODE SUBCODE SUBCODE 8

CODE CODE

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9 10 0>> G 11 0>> ~A073 12 13 3 A L v 0 3 18 Lxgp 19

~xS 20 SEQUENTIAL OCCURRENCE REPORT REVISION Q17 LER]SO REPoRT ACTION FUTURE EVENT YEAR

~79 21 22 EFFECT

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23 SHUTDOWN

~00 24 REPORT NO.

1 26

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~0 28 ATTACHMENT CODE 29 NPRDX TYPE LiJ 30 PRIME COMP.

LJ 31 NO.

LJ 32 COMPONENT TAKEN ACTION ON PLANT METHOD HOURS Q22 SUBMITTED FORM SUB. SUPPLIER MANUFACTURER LB/073 ~X.QR ~Zp>> ~Zp>> O O O O V 023 ~V024 ~V023 L Z O O 023 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 o The cause of this occurrence was dirty torque limit switch contacts 1

which created an opening in the motor circuit after approximately 100 valve travel. The contacts were cleaned and burnished and the valve test

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was successfully completed. The use of an 'ohm meter to check the torque

~14 limit switch contacts will be incorporated into the P.H. program.

80 7

~la 8 9 FACILITY STATUS G Q23 ~00 9P POWER 0 Q23 OTHER STATUS NA

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M3P METHOD OF DISCOVERY

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"DISCOVERY DESCRIPTION Q32 Surveillance Test 7 8 9 10 12 13 ~ 44 45 46 80 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 3 Z Q33 ~ZQ34 NA NA 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION 7 ~00 0 03~ZQ33 NA 80 7 8 9 11 12 13 PERSONNEL INJURIES NUMBER DESCRIPTION 41 3 ~OO O Q43 NA 8 9 11 12 80 7

LOSS OF OR DAMAGE TO FACILITY 43 9

TYPE Z Q42 DESCRIPTION NA VSOZZ30qq 8 9 ~ 10 80 PUB L I CITY NRC USE ONLY ISSUED DESCRIPTION 4S KZ 8

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Q4" 10 NeeklV news 68 69 80 '

I D Iald A. Ross 201-455-8784 NAME OF PREPARER PHONE:

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Jersey Central Power & Ught Company Madison Avenue at Punch Bowl Road Morristown, New Jersey 07960 (201) 455-8200 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/79-1/3L"0 Report Date February 15, 1979 Occurrence Date .

January 18, 1979 Identification of Occurrence Violation of the Technical Specifications, paragraph 3.8:A when valve V-14-35 failed to operate as required during a routine valve operability test. This event is considered .to be a reportable occurrence as defined in the Technical Specifications, paragraph 6.9.2.b.2.

Condit'ions Prior. to Occurrence The plant was in a shutdown condition for maintenance.

Plant parameters at the time of the occurrence were:

Reactor pressure - 145 psig Recirculation flow - 3.1 x 104 gpm Stack Gas - 90 ttCi/sec Description of Occurrence On Thursday, January 18, 1979, at approximately 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br />, while performing the isolation condenser valve operability test, valve V-14-35 failed to open completely. Upon an initiation signal, valve V-14-35 opened approximately 100, and then stopped.

Apparent Cause of Occurrence Component failure was the cause of this event.

Valve V-14-35 is D.C. motor operated and is fitted with a double torque limit switch.

Jersey Central Power Light Company is a Memper of the General Pu inc Utilities System

Reportable Occurrence No. 50-219/79"1/3L-0 Page 2 February 15, 1979 During approximately the first lOR of travel in the opening mode, the torque limit switch is bypassed by the use of a shorting switch because of the high torque required to unseat the valve. After switch controls valve travel.

10'f travel, the torque limit Upon failure of valve V-14-35, investigation revealed that the contacts on the torque limit switch were dirty; thus creating an opening in the motor circuit after approximately 10'f valve travel.

Anal sis of Occurrence The safety significance of this event is considered to be minimal since during this period the "A" isolation condenser was available for operation.

If one isolation condenser is found to be inoperable, there is no immediate threat to the heat removal capability for the reactor and reactor operation.

The purpose of the isolation condenser is to depressurize the reactor and to remove reactor decay heat in the event that the main condenser is unavailable as a heat sink and heat removal systems which required AC power for operation are not available.

Corrective Action The torque limit switch contacts were cleaned with a suitable solvent type cleaner and burnishi'ng, tool. The use of an ohm meter to check the torque limit 'switch contacts will be incorporated into the preventative maintenance program.

Valve V-14-35 was then cycled three times successfully, meeting all the requirements of the isolation condenser valve operability test.

Failure Data Manufacturer: Limitorque Corporation Part No. SMB-00 Type SMB-2

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