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)

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.Date.or Report Date:

5/13/80

~. Occurrence:

5/12/80 e

Initial Written

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Time of

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13/13/6_0 Occurrence:

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

~ f ;.4 " t M.r.;, 5nI W spar,1etq,giap3, 737 7.pu q,g,2,g,2 COND(TIONS PHOR

- Steady state Power Routine SNtdown TO OCCUR 1tENCE:

rot Staadby '

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Opera tion

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Cold Shutdewn load Channet Ovefnq X

Refueling Shutdown Routine Fewer Operation

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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.

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

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

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APPARE*fT CAUSE

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Procedure ~ -

0F OCCURRENCE:

- 19enufacture '.

T7 Unusual Service ;ondIt1on r

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Inc.Enviromental L.

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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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~, ~.since the redundant tefp ctwrmel sensor was nnerable and t.h*

indeca=49nt trf o chann=1 was orareSt e.

The** Fora, the trip w.

4 function was not Inst and a scre would have resultet f f a

' 9enerator f ood re,iection had occurred.

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.TNe defective prassure. switch was disassembled and inspected, CORRECTIVE 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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' Pean Centrois Im:.

o-~t Sw f M "ce ! %.che "7M - 15

.,_.' ~ Serf 31 Number B70

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Ranoa 50 to 240 05i Sa tUno:

1R0 t',I (Decreasing Traswre)

Peerared by:

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A-nate:

s' ' o Jim Schoffaid Approved by:

Date:

Ronala# __daran

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