ML20064J134

Reportable Occurence Rept 50-219/78/28-1P on 781129:Main Steam Line Drain Valve & TIP Isolation Valve for TIPs 1-1 & 1-3 Failed to close.6K27 Relay Replaced,Main Steam Drain Valve Repaired & TIP Sys Switches & Logic Adjusted

ML20064J134
Person / Time
Site:	Oyster Creek
Issue date:	11/30/1978
From:	Quintenz T JERSEY CENTRAL POWER & LIGHT CO.
To:
Shared Package
ML20064J131	List: ML20064J125 ML20064J134
References
NUDOCS 7812290097
Download: ML20064J134 (2)

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iitic1 Telephone Date of November 29, 1978 Occurrence:

port Date: _

Time of mitial Written Occurrence: 0500 apart Date: _

OYSTER CREEK NUCLEAR GENERATING STATION FORKED RIVER NEW JERSEY 08731 Reportable Occurrence Report No. 50-219/78/28-lP

DENTIFICATION Valve V-1-106 (Main Steam Line Drain Valve) and the TIP isolatio valves for TIPS 1-1 and 1-3 failed to close during the performance F OrrDRRENCE: of a low-law reactor water level primary containment isolation

' test.

This event is considered to be a reportable occurrence as defined in the Technical Specifications, paragraph 6.9.2.a.(3).

Steady State Power Routine Shutdoest CONDITIONS PRIOR Hot Standby Operation 170 OCCURRENCE: Load Changes During X Cold Shutdows Routine Power Operation Refueling Shutdown Routine Startup Other (Specify)

OPet 4.ina DESCRIPTION On @ h e i.4r, Novenber 29, 1978, at approximately 0500, while performing'w low-low reactor water level primary contaiment 0F ( CURRENCE: isolation test, valve V-1-106 (a main steam line drain valve) failed to close. Additionally, two traveling incere probes (183) failed to fully withdraw, preventing the' isolation valves for these penetrations to primary containment from closing.

Failure of V-24-29 (reactor coolant sample valve) to close was noted during the test but t?s later discovered to be a failure of the 6K27 relay to provide power to the valvo closed indication.

Design _ Procedutw APPARENT CAUSE Unusual Service Condition 0F OCCURRDiCE: Manufacture Installation / Inc. Environmental Construction X(183) Component Failure Operator X(2) Other (Specify) l l

7 812 2 9 o 0 h

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Page 2 apartable Occurrenco epos-t No. 50-219/78/28-1P

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i (1) The inability of the 6K27 relay to provide closed indication is attributed to the januming of one of the stationary contacts into the armature of the relay. This prevented

! the relay from traveling to its fully de-energized position,

! but did not prevent it free performing its intended function of de-energizing the V-24-29 isolation valve and de-energizing the seal in circuit.

(2) TIP l-1 did not fully withdraw because of the setting for i

"in shield" was corresponding to the setting for machine l "stop" in the control logic; therwfore, the isolation valve did not close. TIP 1-3 required an "in shield" plunger switch adjustment in order to provide a valve closure signal.

(3) The V-1-106 valve failed to close because of a faulty power fuse holder which prevented the energizing of the valve motor operator.

UtALYSIS OF The containment integrity isolation valves are provided to

)CCURRENCE: maintain contairament integrity following the design basis loss of coolant accident. Failure of the above valves to close caused a loss of redundancy in all cases. Primary containment was not required at the time the test was being performed, and additionally, if primary containment had been required in an emergency situation, redundant valves could have operated to prwide isolation of the primary containment.

CORRECTIVE The 6K27 relay was replaced. The power fuse holder in the M~ TION: setor control center for valve V-1-lC6 was repaired, and the j position switches and logic for the TIP system were adjusted. i 7 AIL .E DATA: To be provided later.

red by: [T. b k8=3 Date: //-30-7B Quin y l

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