ML19323C883

RO-50/219/80-16-1P:on 800420,during Surveillance of Generator Load Rejection Sensors,Pressure Switch Psl D Found Defective.Caused by Mislocated Operating Lever in Switch Housing.Switch Removed & Will Be Replaced

ML19323C883
Person / Time
Site:	Oyster Creek
Issue date:	05/13/1980
From:	Baran R, Schofield J JERSEY CENTRAL POWER & LIGHT CO.
To:
Shared Package
ML19323C881	List: ML19323C880 ML19323C883
References
NUDOCS 8005190367
Download: ML19323C883 (2)

Text

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Report Date: 5/13/80 e '

~ . Occurrence: 5/12/80 Initial Written . .. . .x ~;;.: . ,g ~. ,. . Time of .. ,

Report Date: 13/13/6_0 .. - Occurrence: 11:00 M

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.. .; .:...~............,.. ~ ..r-.- _ . .-0YSTER CREEK m! CLEAR GE!!ERATING STATION .--

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..,.l FORKED .RIVEP.. .NEW JERSEY 08731  ;

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.. Recortsble 0ccurrence -

Report tfo. 50-219/an-16 D

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IDENTIriCATI9N ~'Yf oliitt en' or th'e' Technicalfspectrications, par.sgesch .'3.1.A.2 .

OF OCCURRENCEL . .(Table 3.1.1-Itet AT2) when pressure swf tch I'3L'O' was found

... defective .and inoperable. .

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This event is considered to be a "a. cort.1Ste awarrenca ,n da r ined

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COND(TIONS PHOR -

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- Steady state Power Routine SNtdown TO OCCUR 1tENCE: ' rot Staadby ' ~

Opera tion '

Cold Shutdewn load Channet Ovefnq

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X Refueling Shutdown Routine Fewer Operation Rootfne Startup Other (Spec li'y) -

. Operation N ctnr subv i1.i.41 Reector noda switch locked in refuel Cavity flooded . .

DESCRiprinN On Aorf1 70, loRO. while perromin? surveillanca nn nea.rster GF OCC1JPPENCE: Iced re f action sansors, crassure switch Mt."0" c roun<<

detfec tive. Subsequent investigation (5/12/80) revealed that tbt Dressure switch would not have trippad at any pressure dua to a mislocat-d creaittnq tm- within the swf tch hevsing.

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• wn 95 :Mmm re 3 -ofu finq r e sca tha switch was rwad and will he replaced with a new switch prior to plant startun.

Surveillance pretadu e records Indicate tM PSL"D" switch perfomed satisfactorfly en 12/70/79 when tha isst surveillance test wu per1 W . Th. rore, the switch is considar=1 to bey = baen t ter-re1

• b*twarn IR/20/79 and 1/5/S0 wnen the 1980 Refuelino Ont.1ga began.

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• h. snevsf11 rce nare crwad en a/2C/30. tha e.vfu rida n t orgssure swite.h PSt,"F)~ t et th= sene trio cMnnel was feund ccerable as well as the two r*1undant sensors, PSL"A" ful f and g>C" in the independent trip channel ,

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" ' Repertable Occurren'ce - P' Y ' " ^ O~ ' " "' ' Page 2

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Report fio. 50-219/80-i6-1P ,: -

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APPARE*fT CAUSE  : . 6- Design ~.. Procedure ~ - -

0F OCCURRENCE: .. - 19enufacture '. T7 Unusual Service ;ondIt1on r L.

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.- ". ~ Installation / ._ . Inc .Enviromental . .. ' . .

.- - ., .. Cons truc t ion - X - Cannonut F411ure - -- -

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ANALY9IS OF The gener=*.or lead rajection sensors are p--nure swf t:Ns

~ OCCURP.ENCE: . . T '. sensing hydraulic o fi pressure on the turbine accele-atfon

._ relay. There are four sensors; two redumf ant sensors in

_ , . . ., each of two indeP9"dont trip chann.T=.

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The function of these sensor- 15 to provide an anticipatory

,,, - i,3. ycre s ign=1 wh-n la=4 is caja -*ad fete the gaa**5 *~ . '.a . ._ ;

minf:nize reactor pre?.surintion transients The safety

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_ ....signiffeince or t% failed sensor is censida cd minfra'

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4 indeca=49nt trf o chann=1 was orareSt e. The** Fora, the trip function was not Inst and a scre would have resultet f f a

' 9enerator f ood re,iection had occurred.

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CORRECTIVE .TNe defective prassure. switch was disassembled and inspected, ACTIOM: it was found that a plastic linkage that activates the swf tch had fallen out of place and caused the fs11ure.

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rMt.tpg c A TA: ' Pean Centrois Im:. "

o-~t Sw f M "ce ! %.che "7M - 15

. ,_.' ~ Serf 31 Number B70 ~ ~ "

Ranoa 50 to 240 05i Sa tUno: 1R0 t',I (Decreasing Traswre)

Peerared by: U ' . - ~ ' * ~ '- - A- nate: s' ' o -

Jim Schoffaid -

Approved by: Date:

Ronala# __daran

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